Tool device, machine tool, tool device combination and manufacturing method

Abstract

A tool device for use with a hand-held oscillating machine tool has at least one working region adapted to act on a workpiece. The invention relates to a machine tool having a drive shaft, which has a machine connection device, which has an inner contour that extends conically in the direction of a rotational axis, which inner contour has a contour line that surrounds the rotational axis, which contour line has twelve convex projections that project inward towards the rotational axis and twelve concave recesses, the recesses form an uninterrupted, continuously extending contour wall which is arranged rotationally symmetrically about an axis of rotation. The tapered extension is oriented such that the smaller inner diameter of the inner contour is closer to the machine tool and the larger inner diameter is located at a further distance from the machine tool. The tool device has a tool connection device which can be connected to the machine connection device in a rotationally fixed manner in order to transmit a torque and a force between the machine tool and the tool device in such a way that the tool device performs a rotational oscillating movement coaxially to the drive shaft. The tool connecting device is provided with an outer contour, the outer contour is provided with a contour line surrounding the rotating shaft, the contour line is provided with at least one protrusion pointing outwards, and the protrusion is used for being connected in a concave part of an inner contour of the machine connecting device. The protrusion has at least two contact surfaces. The contour line of the tool connection device differs from the contour line of the machine connection device by the number of protrusions; a break or notch in the contour line of the tool connection device; the extension of the contour line of the tool connection device does not extend conically, but extends parallel to the axis of rotation, or extends at an inclination different from that of the contour line of the machine connection device.

Description

Technical Field

[0001] The entire content of the priority application DE202022106179.3 (utility model) is incorporated herein by reference in its entirety.

[0002] The present invention relates to a tool device having at least one working area adapted to act on a workpiece, which is designed for use with a tool machine, in particular a hand-held tool machine, having a rotationally oscillating drive shaft. Background Art

[0003] Hereinafter, the term "tool" will be used simply to replace the term "tool device", but this should not be construed as limiting. In addition, the term "oscillation" will be used simply to replace the term "rotationally oscillating", which should also have the same meaning in the context of this specification.

[0004] A rotationally oscillating tool machine, hereinafter also simply referred to as an oscillating machine or oscillator, in the sense of the present invention is a device having a rotationally oscillating drive means having a drive shaft, wherein the drive means moves from a middle position in a first rotational direction, is braked to a stationary state, and then moves again in the opposite rotational direction until a stationary state. Different from machines with a continuous rotational movement such as drilling machines, circular saws, grinders, etc., the rotationally oscillating movement of this tool enables the use of tools with a non-rotationally symmetric design. Thereby, a series of various tools that can be operated using a rotationally oscillating tool machine have emerged, such as plunge saw blades, segmented saw blades, triangular or segmented grinding tools, etc. The rotationally oscillating tool machine is therefore also referred to as a Multitool.

[0005] The oscillating movement of the drive means of the rotationally oscillating tool machine is usually generated by a drive motor, the output shaft of which is offset by 90° relative to the (virtual) longitudinal axis of the drive shaft and usually rotates in one direction at an adjustable speed. An eccentric wheel is arranged on the output shaft of the motor, and the eccentric wheel drives the drive means of the rotationally oscillating tool machine through a fork-shaped member. Hereinafter, the tool device will be made to rotate around the oscillating (imaginary) axis, which is referred to as the oscillation axis or simply the rotation axis.

[0006] The angular distance from the middle position to the corresponding end position of the oscillating movement can usually reach 5°, but in actual operating machines, smaller angles of 1° to 2.5° are mostly used, which corresponds to a total oscillation angle of 2° to 5° (first to second end positions). This oscillating movement usually occurs 5000 to 50000 times per minute.

[0007] The reversal of the direction of rotation causes the machining force of the tool to also change direction. It is well known that this machining force always acts in the opposite direction to the direction of motion, and here it acts in the opposite direction to the direction of rotation. Depending on the lever arm, that is, the distance from the machining point of the tool to the axis of rotation, a torque is obtained due to the machining force whose direction changes. This torque reverses direction with the oscillation. Superimposed on the torque caused by the machining force is another torque that acts both during machining and during idling, that is, the torque caused by the oscillation of the tool and the oscillating parts of the machine tool, which is used to brake the tool after it reaches its maximum speed (for example, the respective amplitude maxima of the sine curve in the case where the rotational speed of the drive device changes sinusoidally) and to re-accelerate the tool in the opposite direction after the direction of rotation is reversed.

[0008] The torque generated by the machining force and the kinematic conditions of the oscillating drive is mainly applied by the machine tool and introduced into the tool device through the drive.

[0009] Due to the oscillatory motion, the region in the tool where the torque is introduced is subjected to bending-cyclic stresses. This is a particularly tricky problem for the metal materials commonly used to manufacture the tools described here. Metals have a crystal structure. If a local overload occurs in a certain region of a metal component, that is, the stress acting on the component at this location is higher than the stress it can withstand, microcracks will form between the individual grains of the metal structure. These microcracks will damage the strength of the component in two ways. On the one hand, stress cannot be transmitted in the component in the region where the microcracks are formed. This means that the load in this region will increase due to the formation of the cracks because the effective area for force transmission has decreased.

[0010] On the other hand, a phenomenon commonly referred to as the "notch effect" in mechanical engineering will occur. This term originates from the fact that in the notch region, especially if the notch edge is sharp, local stress concentration will occur, which results in the stress in the material region around the notch being higher than the stress in the region of the component that is not affected by this geometry.

[0011] The increased load will cause the cracks to further expand, ultimately leading to the failure of the component.

[0012] This process, which is documented, for example, in the papers of Palmgren and Miner, is called damage accumulation.

[0013] This property of materials or components to withstand vibratory loads and especially cyclic-bending loads is usually characterized by the so-called Wöhler curve of the component It is represented by. The Wöhler curve is based on the following understanding: that is, when a component withstands such a load without damage during load alternations between 2 million and 6 million (Mio.) times (depending on the material), then such an alternating load (referred to as load alternation in the Wöhler test), especially for steel components, can be continuously borne. This is called the so-called fatigue strength (Dauerfestigkeit) of the material or component in mechanical manufacturing.

[0014] As described above, the oscillatory-driven tool oscillates, for example, at a frequency of 20,000 oscillations per minute. This means 40,000 load changes per minute or 2.4 million load changes per hour in the design of durable structures.

[0015] That is, the Wöhler test The lower limit of the fatigue strength of 2 million load alternations in the Wöhler test has been exceeded after one hour of tool operation.

[0016] High numbers of load alternations especially increase the load on the interface between the tool and the machine tool. Here, the magnitude of the load mainly depends on the design of the interface and the machining force exerted by the tool on the workpiece. Generally, the mass inertia force and the machining force can be distinguished here.

[0017] The mass inertia force applied to the interface is caused by rotational oscillations, that is, by braking the tool and accelerating it in the opposite rotational direction. They also occur during idling even when the tool device is not in contact with the workpiece. The mass inertia force depends on the mass moment of inertia of the tool around its oscillation axis, the rotational speed, and the total oscillation angle. The mass moment of inertia itself depends on the distribution of the tool mass around the oscillation axis. Generally, a heavier tool has a greater mass moment of inertia around the oscillation axis than a lighter tool.

[0018] The machining force depends on the type of machining, the material properties of the workpiece being machined, the normal force with which the tool presses on the workpiece, and the performance parameters of the oscillating machine.

[0019] When designing a tool device, the designer must resolve the following objective conflict: If high machining forces are to be applied at higher or high rotational speeds, a stable tool with a stable interface must be used. However, this results in the overall weight of the tool increasing, thus causing the mass inertia force to rise. With the increase in machining force and rotational speed, the load on the interface increases sharply.

[0020] On the other hand, if a lightweight tool with a low mass moment of inertia is used, the mass inertia force acting on the interface will decrease, but at the same time the lightweight tool cannot apply high machining forces.

[0021] The applicant of the present invention launched in 2016 by The interface solves this objective conflict and is described in particular in patent documents WO2015 / 014467A1 and WO2015 / 014468A1. For example, previously, a plunge saw blade, a segmented tool, or a scraper was usually stamped from a flat steel plate with a wall thickness of 1 to 2 mm. In contrast, the Starlock interface is three-dimensionally designed, and the contact surface between the tool receiving part of the machine and the connecting device of the tool is inclined relative to the oscillation axis. This brings several advantages: Through the three-dimensional design, the contact surface between the tool receiving part of the machine and the connecting device of the tool is increased, so that the pressure per unit area is reduced under the same load. The force is transmitted to the connecting device of the tool in a form-fitting manner through a specially designed profile, which has a total of twelve rounded protrusions that protrude radially outwards and can uniformly introduce the force into the tool. Such a profile is provided on the one hand in the tool receiving part of the oscillating machine and on the other hand also in the connecting device of the tool. The profile of the latter is substantially complementary to the former and also has twelve protrusions. The inclination of the contact surface enables the connecting device of the tool to be pressed into the tool receiving part of the oscillating machine in the direction of the oscillation axis, so that the connecting device can be received without clearance by the tool receiving part. This can avoid the relative clearance between the tool receiving part and the tool device. Therefore, it is possible to avoid the disadvantages of the form-fitting connection between the tool receiving part and the tool device of the oscillating machine known in the prior art, in particular the heating and wear of the tool device interface due to the relative clearance, while not losing the advantages of the form-fitting connection in terms of force transmission and precise orientation of the tool with respect to the longitudinal axis of the oscillating machine (the longitudinal axis of the oscillating machine is usually at a 90° angle to the rotary oscillating drive shaft of the oscillating machine). For example, such precise orientation is important when working with a plunge saw blade or a triangular grinding device.

[0022] As expected by the inventors, the Starlock interface enables the use of oscillating machines with significantly higher power today. To prevent lighter machines with lower power from being overloaded by heavy tools, they are divided into three categories, and the connecting devices of the tools are designed accordingly so that only light tools can be used on machines with lower power.

[0023] However, as pointed out by the inventors of the present invention, there is a need in the market for a tool that can be received by a machine with a Starlock profile on the one hand, but on the other hand, the connecting device of which is designed more simply and / or has a lower mass moment of inertia. Summary of the Invention

[0024] Therefore, the object of the present invention is to provide an alternative, Starlock-compatible profile for the connecting device of a tool.

[0025] The object of the invention is achieved by a tool device according to the respective independent claims. Further independent claims protect a combination of a machine tool and a tool device and a manufacturing method. Preferred embodiments of the invention are given by the dependent claims.

[0026] In the following description and claims, the terms "upper" and "lower" mean: "upper" means "closer to the machine tool", and "lower" means "farther from the machine tool". The terms "upper" and "lower" correspond to the working position of a hand-held machine tool. For example, the machine tool is used for grinding work on a horizontal surface located below the hand of the machine tool operator, or for sawing work on a vertical structure where the saw blade is located below the operator's hand. However, the machine tool can also be used in other directions. For example, when using the machine tool to grind a horizontal surface located above the operator's hand, the component arranged in the "upper" direction defined by the present invention is actually located below the component arranged in the "lower" direction defined by the present invention.

[0027] A first aspect of the present disclosure relates to a tool device having at least one working area adapted to act on a workpiece, the tool device being designed to cooperate with a machine tool, in particular a hand-held machine tool.

[0028] Wherein the machine tool has a rotating and oscillating drive shaft that moves at least 10 times per second around a machine-fixed axis of rotation in a first rotational direction and then always reverses the movement and moves in the opposite second rotational direction.

[0029] Wherein a machine connection device is arranged on and coaxial with the drive shaft, the machine connection device having an inner profile that tapers in the direction of the axis of rotation, the inner profile having a profile line (Profilkontur) surrounding the axis of rotation, the profile line having twelve convex protrusions protruding inwardly towards the axis of rotation and twelve concave recesses, the recesses forming an uninterrupted, substantially continuously extending profile wall that is arranged substantially rotationally symmetrically around the axis of rotation, wherein the tapered expansion is oriented such that the region of the inner profile with a smaller inner diameter is closer to the machine tool, called upper, and the region with a larger inner diameter is located at a greater distance from the machine tool, called lower.

[0030] Wherein the drive shaft has a holding device for holding the tool device.

[0031] Wherein the tool device has a tool connection device that can be connected to the machine connection device substantially torsionally resistant in order to transmit torque and force between the machine tool and the tool device, so that the tool device performs a rotating and oscillating movement coaxially with the drive shaft.

[0032] Herein, the tool connecting device has an outer contour which has a contour line surrounding the axis of rotation, and the contour line has at least one outwardly directed protrusion.

[0033] Herein, the at least one protrusion is designed to engage in a recess of the inner contour of the machine connecting device in a state of being connected to the machine tool, and

[0034] Herein, the at least one outwardly directed protrusion has at least two contact surfaces.

[0035] Herein, at least one of these contact surfaces is arranged to transmit the rotational movement of the machine connecting device in a first rotational direction to the tool connecting device, and

[0036] Herein, at least one second contact surface of these contact surfaces is arranged to transmit the rotational movement of the machine connecting device in a second rotational direction to the tool connecting device.

[0037] Herein, the contour line of the tool connecting device is designed to be different from the contour line of the machine connecting device, and is different from the contour line of the machine connecting device at least in the following aspects:

[0038] a) The number of protrusions of the tool device is taken from the group including the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11, in particular from the group including the numbers 1, 2, 3, 4, 5, 8, 9, 10 and 11, and / or

[0039] b) The number of protrusions of the tool device is 13 or more, and / or

[0040] c) The contour line of the tool connecting device is different from the contour line of the machine connecting device in at least two, in particular at least three, circumferentially offset regions around the contour line, and / or

[0041] d) The contour line of the tool connecting device is not designed to be conical, but extends parallel to the axis of rotation, and / or

[0042] e) The contour line of the tool connecting device is inclined with respect to the axis of rotation, and wherein the contour line of the tool connecting device is inclined in a manner different from the contour line of the machine connecting device, and / or

[0043] f) The contour line of the tool connecting device has at least two, in particular at least three, notches (Ausnehmungen), and / or

[0044] g) The contour line of the tool connecting device has a notch which accounts for at least 40%, in particular at least 45%, in particular at least 50% of the circumference of the contour line of the tool connecting device, and / or

[0045] h) The contour line of the tool connection device has at least one matching region and at least one deviating region. The contour line of the tool connection device coincides with the contour line of the machine connection device in the matching region and is different from the contour line of the machine connection device in the deviating region. Wherein, measured along the circumferential direction around the rotation axis, at least one matching region extends through a total matching angle of up to 225°, especially up to 220°, 210°, 200°, 190°, 180°, 170°, 160°, 150°, 140°, 130°, 120°, 110°, 100°, 90°, 80°, 70°, 60°, 50°, 40°, 30°, 20° or 10°, and at least one deviating region extends through a total deviating angle, where the matching angle + the deviating angle = 360°, and / or

[0046] i) The contour line of the tool connection device does not have the shape of a regular hexagon or heptagon in at least one, especially multiple, especially all planes perpendicular to the rotation axis.

[0047] Since the contour line of the tool connection device is designed to be different from the contour line of the machine connection device defined according to the first aspect, at least according to some embodiments, the mass and / or its (rotational) moment of inertia (hereinafter simply referred to as the moment of inertia) of the tool device can be reduced. In addition, at least according to some embodiments, material savings can be achieved when manufacturing the tool device, and the tool device can also be used with a machine tool having a machine connection device different from the machine connection device defined according to the first aspect if necessary. In addition, at least according to some embodiments, the torque that can be transmitted from the machine tool to the tool device or received by the tool device can be increased, especially without damaging the tool device.

[0048] At least according to some embodiments, the term "protrusion" is understood in connection with the contour line of the tool connection device such that the contour line of the tool connection device is configured to be concave at at least one cross-section perpendicular to the rotation axis and at at least one (outer peripheral) region. According to this definition, for example, regular triangles, quadrilaterals, pentagons, etc., and even rectangles do not have "protrusions" because there are no concave regions between the corners of these polygons (seen from the outside). On the contrary, according to this definition, a quadrilateral with an interior angle greater than 180° has two protrusions, namely, at the corners adjacent to this angle.

[0049] Further preferably, the term "protrusion" is understood in connection with the contour line of the tool connection device such that the contour line of the tool connection device is configured as concave in at least one cross-section perpendicular to the axis of rotation and in at least two regions (on the outer circumference). That is to say, according to this definition, the above-mentioned quadrilateral with an interior angle greater than 180° has no protrusion. In contrast, according to this definition, for example, a square with an additional triangle formed on one side (resulting in a heptagon with two interior angles greater than 180°) has exactly one protrusion, namely at the outward-pointing remaining tip of the triangle between these two interior angles.

[0050] The term "contour line of the tool connection device" herein refers to the outer contour of the tool connection device. The tool connection device can also have an inner contour (facing the axis of rotation) with an (inner) contour line, which can (substantially) correspond to the contour line of the outer contour of the tool connection device, or can also be (significantly) different therefrom. The "contour line of the machine connection device" herein refers to the inner contour of the machine connection device.

[0051] The term "contour line of the tool connection device" used herein does not necessarily relate to the entire axial extent of the tool connection device, although this is also possible. In particular, the contour line of the tool connection device can extend between two axial positions such that one or both of these axial positions do not coincide with the corresponding axial end positions of the tool connection device. Thus, the tool connection device can, for example, due to manufacturing reasons, have roundings (Abrundungen) at one or both of its axial end positions (or in the vicinity thereof), where the contour line of the tool connection device extends through or is located in an axial region that connects to (these) roundings or is located between these roundings. In particular, this axial region can be (substantially) concentrically located between the axial end positions or roundings of the tool connection device, or can also be non-concentric, for example when the circumferential region through which one rounding extends is larger than the rounding at the other axial end. The contour line of the tool connection device can, for example, extend over an axial region that corresponds to up to 90%, or up to 80%, or up to 70%, or up to 60%, or up to 50% of the axial extent of the tool connection device.

[0052] A similar description can also apply to the case of the contour line of the machine connection device with respect to its axial extent.

[0053] The axial extension range of the tool connection device (at least within certain angular ranges related to the axis of rotation) can be equal to the axial extension of the machine connection device, or it can also be greater than or less than the axial extension of the machine connection device. Similarly, the axial extension of the contour line of the tool connection device can be equal to the axial extension of the contour line of the machine connection device, or it can also be greater than or less than the axial extension of the contour line of the machine connection device.

[0054] In this context, the plane perpendicular to the axis of rotation is also referred to as the radial plane. That is, for a machine tool, such a radial plane is a plane perpendicular to the axis of rotation of the machine tool. For a tool device, such a radial plane is a plane perpendicular to the axis of rotation of the tool device, and when the tool device is connected coaxially with the axis of rotation of the machine tool as specified and driven by the machine tool, the tool device rotates and oscillates around this axis of rotation.

[0055] As can be seen from features d) and e), the inclination of the contour line of the tool connection device relative to the radial plane can be 90°, or it can also be a value different from 90°. In the case of an inclination of 90° relative to such a radial plane, the contour line of the tool connection device is not inclined relative to the axis of rotation, or rather, the inclination of the contour line of the tool connection device relative to the axis of rotation is 0°. In the case where the inclination relative to the radial plane is not 90°, the inclination of the contour line of the tool connection device relative to the axis of rotation is not 0°. The tangential plane at a point on such an inclined contour line of the tool connection device intersects the axis of rotation exactly at one point.

[0056] Furthermore, in the case where the inclination relative to the radial plane is not 90°, the inclination can be greater than or less than 90°. In this context, an inclination less than 90° is defined as an inclination that causes the contour line (or one of its axial segments) of the tool connection device to open downward (further). Correspondingly, an inclination greater than 90° is defined as an inclination that causes the contour line of the tool connection device (or one of its axial segments) to narrow downward.

[0057] In addition, it can be clearly seen especially from feature e) that the inclination of the contour line of the tool connection device (or one of its axial segments) can be different from the inclination of the contour line of the machine connection device (or one of its axial segments).

[0058] In the present invention, the term "notch" can be understood as continuous holes (or through-holes) or discontinuous holes (or blind holes) or both, unless otherwise explicitly stated and / or other meanings can be inferred from the context. The terms "hole" or "through-hole" used herein should not be understood as holes or through-holes that must be manufactured by drilling. Instead, such holes or through-holes can also be achieved by other method steps, in particular by forming, deforming or generative method steps. The hole or through-hole does not necessarily have to have a circular cross-section, but in principle can have a cross-section of any shape.

[0059] Viewed from the radial plane, the twelve convex protrusions and the twelve concave recesses of the machine connection device that protrude inwardly towards the axis of rotation can together form a star with twelve teeth, in particular a regular star, i.e., a star with twelve teeth that are regularly distributed circumferentially with an angular pitch of 30°. Here, the inner angle of the 12-tooth star at the teeth can be, for example, 120°, while at the center point between two adjacent teeth it can be, for example, 210°.

[0060] The transition between two adjacent sides of the 12-tooth star can be rounded, especially for ease of manufacture. Again, viewed from the radial plane, the radius of curvature of this transition can be, for example, in the range between 5 mm and 1.5 mm. The radius of curvature of the upper axial end of the machine connection device is smaller than the radius of curvature of the lower axial end of the machine connection device. Preferably, the radius of curvature, especially the radius of curvature in the radial plane centrally located between the two axial ends of the machine connection device, is greater than 2 mm, especially greater than 2 1 / 4 mm, preferably greater than 2.5 mm. Further preferably, the radius of curvature, especially the radius of curvature in the centrally arranged radial plane, is less than 4.5 mm, especially less than 4 mm, preferably less than 3.5 mm. Further preferably, the radius of curvature, especially the radius of curvature in the centrally arranged radial plane, is approximately 3 mm ± 1 / 4 mm. With such a radius of curvature, on the one hand, high strength is achieved, and on the other hand, manufacture is simplified, for example when using the deep drawing process (Tiefziehverfahren).

[0061] Similarly, the contour line of the tool connection device can have a rounding, especially at the transition between two adjacent contact surfaces. When observed in a radial plane, the radius of curvature of such a transition can be, for example, in the region of the aforementioned machine connection device, where the radius of curvature of the tool connection device can be substantially equal to the radius of curvature of the machine connection device, or different therefrom, especially can be greater than the radius of curvature of the machine connection device. The radius of curvature of such a rounding can be the same (i.e., constant) at all positions of the rounding, or different (i.e., variable). Thus, if, for example, two adjacent contact surfaces of the tool connection device (observed in a radial plane) enclose a certain angle, for example, an interior angle of 120° or 210°, this does not necessarily mean that these two contact surfaces (in the exact geometric sense) intersect exactly at a point or exactly on a line / edge, but rather there can be the aforementioned rounding between them.

[0062] The term "notch" mentioned in feature g) should in particular be understood as a single notch, i.e., a continuous notch (especially structurally closed and, if necessary, separated from other existing notches), sometimes also referred to as a discrete notch (or described in English as "discrete recess"), and is not to be understood as the sum of a plurality of individual (discrete) notches.

[0063] Furthermore, the term "perimeter of the contour line" mentioned in feature g) in particular refers to the perimeter that the contour line of the tool connection device has when it continues in the notch region, especially as it continues (regularly if necessary) as in a region of the contour line of the tool connection device without notches or with only very small notches. If necessary, the term (for a tool connection device provided with at least one notch) "perimeter of the contour line" can also be understood as the perimeter of the inner contour of the machine connection device, especially at the height of the notch (in the axial direction) of the tool connection device.

[0064] Regarding feature i), the contour line of the tool connection device can, for example, have an irregular hexagonal shape in at least one, especially a plurality, especially all planes perpendicular to the axis of rotation, or even neither hexagonal nor heptagonal.

[0065] Various embodiments of the tool device will be described below, and these embodiments can be arbitrarily combined with each other as long as they are not explicitly excluded or technically infeasible, and can also be combined with other aspects and their embodiments of the present invention further described.

[0066] In embodiments that are at least applicable to a), it is also possible, if necessary by reducing the number of protrusions, to reduce the moment of inertia, mass, and / or material consumption of the tool device.

[0067] According to some embodiments, if at least a) applies, the contour line of the tool connection device substantially coincides with the contour line of the machine connection device on the first sub-region and is different from the contour line of the machine connection device on the second sub-region, where the contour line of the tool connection device extends within the volume defined by the inner contour of the machine connection device in the second sub-region.

[0068] Or, in other words: On the first sub-region, the contour line of the tool connection device is substantially part of a star-shaped polygon in a cross-section perpendicular to the axis of rotation, where the star-shaped polygon has twelve outwardly protruding protrusions and twelve inwardly recessed depressions. In contrast, in the second sub-region of the tool connection device, the contour line of the tool connection device extends inside the star-shaped polygon (or inside the volume defined by the corresponding star-shaped polygons in different radial planes of the tool connection device) in the same cross-section perpendicular to the axis of rotation.

[0069] Since the contour line of the tool connection device extends inside this volume in the second sub-region, the moment of inertia of the tool device is reduced because in the second sub-region the inner contour is closer to the axis of rotation than in the case where the inner contour also follows the star-shaped polygon in the second sub-region.

[0070] The following explanation is made for the concept of "inside the volume defined by the inner contour of the machine connection device": The part of the tool connection device to be inserted into the machine connection device already extends inside the volume of the machine connection device. When the tool device and the corresponding machine tool are used as specified, the tool connection device and the machine connection device will come into contact in at least multiple regions, more precisely point contact, line contact or surface contact, that is, the regions of the outer contour of the tool device will contact the inner contour of the machine connection device in a point or area manner. However, in this context, "inside the volume" means that the relevant regions of the outer contour of the tool device extend at a certain distance from the inner contour of the machine connection device, that is, extend at a smaller radius with respect to the axis of rotation. This distance is especially greater than a very small microscopic distance, for example, at least 0.1 mm in at least some regions.

[0071] According to some embodiments, the contour line of the tool connection device connects two outwardly pointing protrusions through a substantially flat surface or a curved surface in the second sub-region.

[0072] Similarly, through such a flat or curved surface, not only can the moment of inertia of the tool device be reduced because the contour line of the tool connection device is closer to the axis of rotation as described above, but also because such a curved and especially such a flat surface can represent a (more) direct connection or "shortening", the extension of which can be shorter than along the route of a star polygon. With the same wall thickness and raw material, the weight of the tool device will be smaller with a shorter extension. Accordingly, material can also be saved.

[0073] On the other hand, the extension of the contour line with outwardly directed protrusions and inwardly directed recesses is particularly advantageous in terms of mechanical stability, i.e., the operating reliability (Betriebsfestigkeit) and / or stiffness of the tool connection device. Here, the operating reliability refers to the ability of the tool to withstand the loads occurring within the design life, and the stiffness refers to the ability of the tool to resist deformations, especially elastic deformations, due to the occurring forces or torques. Therefore, the embodiment in which the contour line of the tool connection device connects two outwardly directed protrusions through a substantially flat surface or a curved surface in the second sub-region is particularly suitable for those applications where only a reduction in load is desired, for example, when machining workpieces that only require low machining forces due to material reasons.

[0074] To achieve the advantage of torque reduction and at the same time maintain a relatively high strength, i.e., load-carrying capacity, of the tool device, the contour line can also have outwardly directed protrusions and inwardly directed recesses in the second sub-region, but with a smaller radius than in the first sub-region.

[0075] In some embodiments where the tool device has only a single outwardly directed protrusion, the contour line of the tool connection device can connect the two contact surfaces of the single protrusion in the second sub-region through at least three substantially flat surfaces, or through at least one substantially curved surface, or through at least one substantially flat surface and at least one substantially curved surface. This embodiment is also particularly suitable for applications where only a reduction in load is desired.

[0076] In embodiments that are at least applicable to b), if necessary, the mechanical stability or load-carrying capacity of the tool device can be increased by at least one additional protrusion.

[0077] According to some embodiments, when at least applicable to b), the contour line of the tool connection device is substantially the same as the contour line of the machine connection device in the first sub-region and different from the contour line of the machine connection device in the second sub-region, wherein the contour line of the tool connection device extends inside the volume defined by the inner contour of the machine connection device in the second sub-region. In this way, not only can the mechanical stability or load-carrying capacity be improved, but also the moment of inertia and / or material consumption can be reduced.

[0078] In these embodiments, the contour line of the tool connection device may have more outward protrusions in the second sub-region than the recessed recesses of the machine connection device.

[0079] In embodiments that are at least applicable to c), the moment of inertia, mass, and / or material consumption can be reduced again if necessary. Since the contour line of the tool connection device is different from the contour line of the machine connection device in at least two, particularly at least three regions that are offset along the perimeter of the contour line, a more uniform weight distribution can be achieved in the region of the tool connection device if necessary, compared to the case where the contour line of the tool connection device is different from the contour line of the machine connection device only in a certain region of its perimeter.

[0080] According to some embodiments, when at least applicable to c), the regions where the contour line of the tool connection device is substantially the same as the contour line of the machine connection device define a plurality of first sub-regions, and the regions where the contour line of the tool connection device is different from the contour line of the machine connection device define a plurality of second sub-regions, where the contour line of the tool connection device extends inside the volume defined by the inner contour of the machine connection device in the second sub-regions. This can reduce the moment of inertia, mass, and / or material consumption again if necessary.

[0081] According to some embodiments, the contour line of the tool connection device is in:

[0082] - exactly one second sub-region, or

[0083] - at least one second sub-region, or

[0084] - a plurality of second sub-regions, or

[0085] - a plurality but not all of the second sub-regions, or

[0086] - all second sub-regions,

[0087] substantially the same as the contour line of the machine connection device in a first cross-section perpendicular to the axis of rotation, and different from the contour line of the machine connection device in a second cross-section perpendicular to the axis of rotation and different from the first cross-section.

[0088] Or in other words: The contour line of the tool connection device also follows or corresponds to the contour line of the machine connection device in one, several or all of the second sub-regions in the first cross-section, and thus has one or more outwardly directed protrusions in these sub-regions and, if necessary, recessed depressions, which correspond to the twelve convex protrusions and the twelve concave depressions of the inner contour of the machine connection device that protrude towards the axis of rotation. In contrast, the contour line of the tool connection device does not follow or correspond to the contour line of the machine connection device in different second cross-sections. For example, the contour line of the tool connection device cannot be designed as conical in at least one or more of the second sub-regions, but extends parallel to the axis of rotation.

[0089] Therefore, the deviation of the contour line of the tool connection device from the contour line of the machine connection device may concern various regions over the entire circumference (i.e., over the entire axial extent of the tool connection device), or only concern the axial regions of this entire axial extent. For example, the contour line of the tool connection device can first be conical in the second sub-region (in particular following the contour line of the machine connection device), and then extend parallel to the axis of rotation.

[0090] Therefore, feature c) allows the following embodiments: In some angular ranges (relative to the axis of rotation), the contour line of the tool connection device follows the inner contour of the machine connection device in multiple or all cross-sections, while in other angular ranges it does not.

[0091] Feature c) also allows the following embodiments: The contour line of the tool connection device extends substantially conically in some or even all angular ranges, but has an opening angle different from that of the machine connection device, for example a smaller opening angle. In this context, in particular, twice the angle between the axis of rotation and the tangential plane at the contour line point of the tool connection device or the machine connection device is regarded as the opening angle.

[0092] The opening angle of the contour line of the tool connection device can also be different from the opening angle of the contour line of the machine connection device, such that the cross-section of the tool connection device is smaller in the plane remote from the machine tool (perpendicular to the axis of rotation) (i.e., the lower plane) than in the plane close to the machine tool (perpendicular to the axis of rotation) (i.e., the upper plane). Here, the opening angle of the contour line of the tool connection device can be numerically smaller than, larger than or equal to the opening angle of the contour line of the machine connection device.

[0093] According to some embodiments, the contour line of the tool connection device is in

[0094] - exactly one second sub-region, or

[0095] - at least one second sub-region, or

[0096] - among a plurality of second sub-regions, or

[0097] - among a plurality but not all of the second sub-regions, or

[0098] - among all of the second sub-regions,

[0099] is different from the contour line of the machine connection device in all cross-sections perpendicular to the axis of rotation.

[0100] Thus, feature c) allows the following embodiments: the contour line

[0101] - in one or more sub-regions, in all cross-sections perpendicular to the axis of rotation, coincides with the contour line of the machine connection device, and

[0102] - in one or more other sub-regions, in some but not all cross-sections perpendicular to the axis of rotation, coincides with the contour line of the machine connection device, and

[0103] - in one or more other sub-regions, in all cross-sections perpendicular to the axis of rotation, is different from the contour line of the machine connection device.

[0104] In embodiments that are at least applicable to d), the contour line of the tool connection device can in turn extend inside the volume defined by the inner contour of the machine connection device. In this way, a reduction in the moment of inertia, mass, and / or material consumption of the tool device can be achieved if necessary.

[0105] According to some embodiments that are at least applicable to d), the contour line of the tool connection device is substantially coincident with the contour line of the machine connection device in at least one first cross-section perpendicular to the axis of rotation. This is the case, for example, at the upper axial end of the tool connection device. In contrast, in another (second) cross-section perpendicular to the axis of rotation, the contour line of the tool connection device deviates from the contour line of the machine connection device due to its extension parallel to the axis of rotation. However, the following embodiments can also be envisaged: the cross-section perpendicular to the axis of rotation (in which the contour line of the tool connection device is substantially coincident with the contour line of the machine connection device) is not located at the upper axial end of the tool connection device, but at an axial position, for example, between the upper and lower ends of the tool connection device.

[0106] According to some embodiments that are at least applicable to d), the contour line of the tool connection device deviates from the contour line of the machine connection device in all cross-sections perpendicular to the axis of rotation.

[0107] For example, such deviations in all cross-sections perpendicular to the axis of rotation can be manifested as follows: one or more cross-sections of the contour line of the tool connection device coincide with one or more cross-sections of the machine connection device within one or more angular ranges and deviate from them within one or more other angular ranges, especially extending within the cross-section of the machine connection device. In addition, in these embodiments, the contour line of the tool connection device extends parallel to the axis of rotation.

[0108] In embodiments that are at least applicable to e), the contour line of the tool connection device can also extend within the volume defined by the inner contour of the machine connection device. However, if at least within the cross-section perpendicular to the axis of rotation, the contour line of the tool connection device corresponds to or follows the contour line of the machine connection device within at least a (sufficiently large) angular range and / or the tool connection device can contact the machine connection device at multiple points (distributed circumferentially), a torsion-resistant connection can be achieved between the tool connection device and the machine connection device.

[0109] According to some embodiments that are at least applicable to e), the extension of the contour line of the tool connection device is steeper than the extension of the inner contour of the machine connection device.

[0110] In particular, the fact that the contour line of the tool connection device has a different, especially steeper inclination compared to the machine connection device can be manifested, for example, as follows: the minimum angle enclosed between one or more tangential planes on one or more contact surfaces of the tool connection device and the axis of rotation is smaller than the minimum angle enclosed between one or more inner contour surfaces (on one or more tangential planes) of the inner contour of the machine connection device or the machine contact surface and the axis of rotation.

[0111] Similar to the embodiments of feature c), in feature e), although the contour line of the tool connection device extends substantially conically, it has a different opening angle from the machine connection device, for example, a smaller opening angle. The opening angle of the contour line of the tool connection device can also be different from the opening angle of the contour line of the machine connection device, such that the cross-section of the tool connection device is smaller in the plane farther from the machine tool (perpendicular to the axis of rotation) (i.e., the lower plane) than in the plane closer to the machine tool (perpendicular to the axis of rotation) (i.e., the upper plane). Here, the opening angle of the contour line of the tool connection device is numerically smaller than, larger than, or equal to the opening angle of the contour line of the machine connection device.

[0112] In embodiments that are at least applicable to f), at least two notches can be configured, for example, as through holes or as recesses that especially point radially inward. This in turn reduces the moment of inertia, mass, and / or material consumption of the tool device.

[0113] According to some embodiments that are at least applicable to f), at least one notch is respectively arranged between two adjacent contact surfaces.

[0114] This can simplify the manufacture of the tool device if necessary, but can also contribute to the improvement of the torque transmission capacity, as will be elaborated below.

[0115] According to some embodiments, at least one notch is arranged between two adjacent contact surfaces such that the two adjacent contact surfaces do not contact in at least one, in particular multiple, in particular all cross-sections perpendicular to the axis of rotation. That is, in the latter case, at least one notch extends over the entire axial extent of one or both of the opposite edges of the contact surface. Conversely, if at least one notch does not extend over the entire axial extent of one or both of the opposite edges of the contact surface, the two adjacent contact surfaces contact in at least one, in particular multiple cross-sections perpendicular to the axis of rotation.

[0116] According to some embodiments, at least one notch has a length LA in the circumferential direction of the circumferential contour of the tool connection device, and the contact surface adjacent to the notch has a length LK, where the ratio LK:LA is at least 4:3, preferably at least 5:3, preferably at least 2:1, preferably at least 5:2, preferably at least 3:1.

[0117] A larger ratio LK:LA can be beneficial to mechanical stability, i.e., the strength and / or stiffness of the tool device, and thus also to its torque-carrying capacity. Conversely, a smaller ratio LK:LA can more greatly reduce the moment of inertia, mass, and / or material consumption.

[0118] According to some embodiments, at least one, in particular multiple, in particular all notches are arranged in the circumferential direction of the circumferential contour of the tool connection device at the angular positions of the protrusions provided with the tool connection device. At these angular positions, the effect of the notch in reducing the moment of inertia may be particularly large.

[0119] According to some embodiments, the circumferential contour of the tool connection device has at least one radially inwardly directed recess. Here, at least one recess of the tool connection device can in particular be arranged between two adjacent contact surfaces or be formed by two adjacent contact surfaces.

[0120] According to some embodiments, at least one, in particular multiple, in particular all notches are arranged in the circumferential direction of the circumferential contour of the tool connection device at the angular positions of the recesses provided with the tool connection device.

[0121] Here, at least one, in particular a plurality, in particular all of the notches can have a greater length in the circumferential direction of the contour line of the tool connection device at the corner positions of the protrusions of the tool connection device than at the corner positions of the recesses of the tool connection device. This is advantageous in terms of manufacturing technology. Furthermore, compared to (otherwise similar) notches at the corner positions of the recesses of the tool connection device, the notches at the corner positions of the protrusions of the tool connection device contribute more to reducing the moment of inertia.

[0122] Alternatively, at least one, in particular a plurality, in particular all of the notches (in terms of their length in the circumferential direction of the contour line) at the corner positions of the protrusions of the tool connection device can be substantially as large as, or even smaller than, at least one, in particular a plurality, in particular all of the notches at the corner positions of the recesses of the tool connection device. To ensure this, manufacturing technology aspects can be taken into account as described below if necessary within the framework of the present invention.

[0123] In embodiments that are at least applicable to g), relatively large notches particularly contribute to reducing the moment of inertia of the tool device and, if necessary, also to reducing the mass and material consumption of the tool device.

[0124] According to some embodiments that are at least applicable to g), the notches extend through at least 40%, in particular at least 45%, in particular at least 50% of the circumference of the contour line of the tool connection device in at least one plane perpendicular to the axis of rotation. Alternatively, the notches do not extend through at least 50%, in particular at least 45%, in particular at least 40% of the circumference of the contour line of the tool connection device in any plane perpendicular to the axis of rotation, where such a plane is considered individually. In particular, the notches can extend in different planes perpendicular to the axis of rotation in this case.

[0125] The extension of the notches in the circumferential direction can have, for example, one or more bends, waves, or serrated structures, etc.

[0126] Similar to feature g), in embodiments that are at least applicable to h), relatively small consistent regions (and thus relatively large difference regions) also particularly contribute to reducing the moment of inertia and, if necessary, also to reducing the mass and material consumption.

[0127] According to some embodiments that are at least applicable to h), the contour line of the tool connection device differs from the inner contour of the machine connection device in at least one difference region for the following reasons:

[0128] - The contour line of the tool connection device is radially inwardly offset (zurückgesetzt) relative to the inner contour of the machine connection device with respect to the axis of rotation, in particular extending with a smaller radius than the corresponding region of the inner contour of the machine connection device; and / or

[0129] - The contour line of the tool connection device has a different inclination with respect to the inner contour of the machine connection device with respect to the axis of rotation, in particular extending parallel to the axis of rotation; and / or

[0130] - The contour line of the tool connection device has notches; and / or

[0131] - The contour line of the tool connection device has a stepped structure.

[0132] The term "stepped structure" is particularly understood to mean that the contour line of the tool connection device does not extend approximately uniformly from one axial end of the contact surface to the other axial end of the contact surface, but has at least one step located therebetween. Here, when viewing the connection device in a cross-section extending through the axis of rotation, the term "step" should be understood as a distinct change in angle in the direction towards the axis of rotation, followed by a corresponding reverse change in the inclination angle. This can be illustrated by way of example: a first region of the contact surface, in particular the lower region, encloses an angle of 70° with a plane perpendicular to the axis of rotation, while another region of the contact surface, in particular the upper region, encloses an angle of 50° with a plane perpendicular to the axis of rotation.

[0133] However, such a stepped structure can also have one or more portions in which the tool connection device extends (substantially) perpendicular to the axis of rotation.

[0134] The tool connection device having a stepped structure does not necessarily have to be stepped over the entire circumference, it can be stepped in some portions and non-stepped in other portions. Similarly, the tool connection device can have a first stepped structure in one or more portions of the circumference and a second stepped structure different from the first stepped structure in one or more other portions of the circumference.

[0135] According to some embodiments that are at least applicable to h),

[0136] - The contour line of the tool connection device can have at least two discrete difference regions, in particular at least three discrete difference regions; and / or

[0137] - The contour line of the tool connection device can have at least two discrete consistent regions, in particular at least three discrete consistent regions; and / or

[0138] - The contour line of the tool connection device can be different from the inner contour of the machine connection device in at least one differential region in all planes extending perpendicular to the rotation axis, or the contour line of the tool connection device can be consistent with the inner contour of the machine connection device in at least one differential region in at least one, in particular several, but not all planes extending perpendicular to the rotation axis.

[0139] The tool connection device can also have (significantly) more than three regions of consistency and / or regions of difference, for example (at least) six, in particular (at least) twelve, in particular (at least) twenty-four.

[0140] In all of the foregoing embodiments, at least two contact surfaces of the tool connection device, in particular all of the contact surfaces, extend between a first and a second end plane (Abschlussebene) that are arranged perpendicular to the rotation axis and spaced apart from each other.

[0141] Wherein, the tool device can have a transition portion that connects the tool connection device to the working area and is preferably connected to the tool connection device with respect to the rotation axis, in particular substantially at the height of the first end plane. And

[0142] Wherein, the tool device can have a cover portion that extends from the outer contour of the tool connection device in the direction towards the rotation axis and is located with respect to the rotation axis, in particular substantially at the height of the second end plane.

[0143] In particular, the first end plane can be located at or near the lower axial end of the tool connection device, and the second end plane can be located at or near the upper axial end of the tool connection device.

[0144] A second aspect of the present disclosure relates to a tool device having at least one working area adapted to act on a workpiece, the tool device being designed for use with a tool machine, in particular a hand-held tool machine.

[0145] Wherein, the tool machine has a rotationally oscillating drive shaft that moves at least 10 times per second around a rotation axis fixed to the machine in a first rotation direction and then always reverses the movement and moves in an opposite second rotation direction.

[0146] Wherein, a machine connection device is arranged on the drive shaft and coaxially with the drive shaft, the machine connection device having an inner contour that tapers in the direction of the rotation axis, the inner contour having a contour line surrounding the rotation axis, the contour line having twelve convex protrusions protruding inwardly towards the rotation axis and twelve concave recesses, the recesses forming an uninterrupted, substantially continuously extending contour wall that is arranged substantially rotationally symmetrically around the rotation axis.

[0147] The drive shaft has a holding device for holding the tool device,

[0148] The tool device has a tool connection device which can be connected to the machine connection device in a substantially torsion-resistant manner in order to transmit torque and force between the machine tool and the tool device, so that the tool device performs a rotational oscillating movement coaxially with the drive shaft,

[0149] The tool connection device has an outer contour which has a contour line surrounding the axis of rotation and which has at least one outwardly directed projection,

[0150] The at least one projection is designed to engage in a recess in the inner contour of the machine connection device in the state of connection to the machine tool, and

[0151] The at least one outwardly directed projection has at least two contact surfaces,

[0152] At least one of these contact surfaces is arranged to transmit the rotational movement of the machine connection device in a first rotational direction to the tool connection device, and

[0153] At least one second contact surface of these contact surfaces is arranged to transmit the rotational movement of the machine connection device in a second rotational direction to the tool connection device,

[0154] At least two contact surfaces of the tool connection device, in particular all contact surfaces, extend between a first end plane and a second end plane which are arranged perpendicular to the axis of rotation and spaced apart from each other,

[0155] The tool device has a transition section which connects the tool connection device to the working area and is preferably connected to the tool connection device with respect to the axis of rotation, in particular substantially at the height of the first end plane,

[0156] The tool device has a cover section which extends from the outer contour of the tool connection device in the direction towards the axis of rotation and is located with respect to the axis of rotation, in particular substantially at the height of the second end plane,

[0157] The tool device has a wall thickness tk in the contact surface area and a wall thickness td in the cover section area, where the wall thickness tk in the contact surface area is greater than the wall thickness td in the cover section area.

[0158] Therefore, according to a second aspect of the invention, a tool device can be manufactured with a wall thickness td in the cover section area lower than the wall thickness tk in the contact surface area. Thereby, the moment of inertia, mass and / or material consumption of the tool device can also be reduced.

[0159] According to some embodiments, the wall thickness tk of the contact surface region:

[0160] - is measured in a direction perpendicular to the respective contact surface, or

[0161] - is measured in a direction corresponding to the direction in which the perpendicular to the respective contact surface is projected onto a plane extending perpendicular to the axis of rotation. If the contact surface does not extend parallel to the axis of rotation, (possibly slightly) different wall thicknesses will result from these measurements.

[0162] Preferably, in this case, the wall thickness tk of the contact surface region is defined as:

[0163] - the average value of all wall thicknesses in the contact surface region, or

[0164] - the maximum value of all wall thicknesses in the contact surface region, or

[0165] - the minimum value of all wall thicknesses in the contact surface region.

[0166] These embodiments specifically take into account that the wall thickness in the contact surface region is not necessarily constant over all regions of the contact surface. For example, the average value of all wall thicknesses in the contact surface region can be defined as the median or a weighted average by integrating the wall thickness over all contact surfaces and dividing the result of the integration by the total area of the contact surface.

[0167] According to some embodiments, the wall thickness td in the cover region is measured in a direction parallel to the axis of rotation and is preferably defined as

[0168] - the average value of all wall thicknesses within the cover region, or

[0169] - the maximum value of all wall thicknesses within the cover region, or

[0170] - the minimum value of all wall thicknesses within the cover region, or

[0171] - the wall thickness at the radially innermost point of the cover.

[0172] It is considered here that the wall thickness in the cover region is not necessarily constant over all regions of the cover.

[0173] According to some embodiments, the wall thickness tk in the contact surface region is at least 10% or 20% or 30% greater than the wall thickness td in the cover region. Or conversely, the wall thickness td in the cover region is at least 10% or 20% or 30% smaller than the wall thickness tk in the contact surface region.

[0174] Thereby, the moment of inertia, mass, and / or material consumption of the tool device can be reduced again.

[0175] According to some embodiments, the wall thickness td in the cover region is between 1 mm and 1.5 mm. Of course, other dimensions are also possible.

[0176] According to some embodiments, the cover has at least one opening, in particular a central opening.

[0177] For example, the hook-shaped device disclosed in the patent document WO2015 / 014468A1 can pass through this opening in the cover in order to hold the tool device on a machine tool as described in this document.

[0178] The cover may have other notches or coding devices (or "keying devices" in English), for example, regions protruding axially (i.e., extending upward from the first end plane), or recesses (i.e., regions in the cover where the surface is closer to the first (lower) end plane than the region around the cover), or through holes. Such coding devices can be used to make certain tool devices only usable with specific machine tools. For example, a specific machine tool has complementary-shaped coding devices in the machine connection device. On the other hand, such coding devices can also ensure compatibility with specific machine tools.

[0179] According to some embodiments, the contour line of the tool connection device has a stepped structure. This stepped structure can particularly have multiple steps. Here, the contact surfaces of different steps of the tool connection device can have different inclinations with respect to the rotation axis. Additionally or alternatively, the contour line of the tool connection device can have different cross-sections in a plane perpendicular to the rotation axis, particularly in the case of contact surfaces extending parallel to the rotation axis.

[0180] The third aspect of the present disclosure relates to a combination of a machine tool and a tool device, which includes:

[0181] The tool device and the machine tool as described above,

[0182] wherein the machine tool has a rotationally oscillating drive shaft that moves around a machine-fixed rotation axis at least 10 times per second in a first rotation direction and then always reverses the movement and moves in the opposite second rotation direction,

[0183] wherein a machine connection device is arranged on and coaxial with the drive shaft, the machine connection device having an internal contour that tapers in the direction of the rotation axis, the internal contour having a contour line surrounding the rotation axis, the contour line having twelve convex protrusions protruding inwardly towards the rotation axis and twelve concave recesses, the recesses forming an uninterrupted, substantially continuously extending contour wall that is arranged substantially rotationally symmetrically around the rotation axis,

[0184] In this case, the drive shaft has a holding device for holding a tool device.

[0185] A fourth aspect of the present disclosure relates to a method for manufacturing the above-mentioned tool device, wherein the method:

[0186] A forming, deforming or generative method step or a combination of a plurality of the following method steps for producing the contour of the tool connection device is selected from: forging, stamping, rolling, extrusion, folding, deep drawing, curling, straightening, bending, stretching, upsetting, sintering, casting, layer-by-layer deposition, etc.; and / or

[0187] The method step of separating for producing the notch or opening is preferably a method step of thermal separation or mechanical separation, or a combination of a plurality of the following method steps, selected from: sawing, grinding, milling, punching, shearing, particle beam cutting, electron beam cutting, laser beam cutting, plasma cutting, combustion cutting, spark erosion cutting.

[0188] In particular, the tool device, at least its outer shape, can be produced completely or predominantly by a generative manufacturing process.

[0189] According to some embodiments, the method comprises the following steps:

[0190] A) providing a workpiece, the workpiece having a substantially flat area;

[0191] B) making at least one notch or opening in the substantially flat region of the workpiece;

[0192] C) machining the substantially flat region of the workpiece to produce the contour of the tool connection device, wherein step C) is performed after steps A) and B).

[0193] That is, in the method at least one notch or opening is produced before the contour of the tool connection device is produced from an initially substantially flat region of the workpiece. This can simplify the production process.

[0194] According to some embodiments, the notch or opening produced in step B) forms a notch or opening in the contour of the tool connection device, in particular between two adjacent contact surfaces, in particular in the area of ​​an outwardly directed protrusion and / or an inwardly concave recess of the contour of the tool connection device.

[0195] In step B), notches or openings can be made not only in the region of the outwardly directed projections of the contour of the tool connecting device, but also in the region of the inwardly recessed depressions. These notches or openings can initially be of the same size, for example. However, the machining in step C) may result in the notches or openings located in the region of the outwardly directed projections eventually (in the circumferential direction) being larger than the notches or openings located in the region of the inwardly directed concave depressions of the contour of the tool connecting device.

[0196] Alternatively, in step B), the notches or openings can initially be made with different dimensions (in the circumferential direction). For example, the notches or openings located in the region of the outwardly directed projections in the finished tool device can initially be designed to be smaller than the notches or openings located in the region of the inwardly directed concave depressions of the contour of the tool connecting device in the finished tool device. By machining the substantially flat regions of the workpiece in step C), the sizes of the notches or openings may change, in particular differently. For example, notches or openings initially made with different sizes (in the circumferential direction), especially on the projections or depressions of the contour of the tool connecting device, can eventually have substantially the same size (in the circumferential direction).

[0197] Steps A), B) and C) can be carried out in the order described above. However, instead of carrying out steps A), B) and C) sequentially, a method can also be employed in which steps A) and B) are carried out substantially simultaneously, for example by means of a suitable die, to shape the (initially planar) outer contour of one or more tool devices as a whole and at the same time form depressions or openings. However, in this variant, step C) is still carried out after steps A) and B). Description of the Drawings

[0198] The following drawings show various features and embodiments of the present invention, and are shown partly schematically. These features and embodiments can be combined with each other and are not limited only to those shown in the drawings.

[0199] Wherein:

[0200] Figure 1 An exemplary perspective view of a machine connecting device according to the prior art is shown.

[0201] Figure 2 A perspective view of a tool connecting device according to an embodiment of the present invention is shown.

[0202] Figure 3 A cross-section in a plane perpendicular to the axis of rotation of the internal contour of a machine connecting device and the external contour of a tool connecting device according to an embodiment of the present invention is shown.

[0203] Figure 4Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0204] Figure 5 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0205] Figure 6 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0206] Figure 7 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0207] Figure 8 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0208] Figure 9 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0209] Figure 10 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0210] Figure 11 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0211] Figure 12 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0212] Figure 13 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0213] Figure 14 Shows a cross-section of the internal contour of the machine connection device and the external contour of the tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0214] Figure 15Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0215] Figure 16 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0216] Figure 17 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0217] Figure 18 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0218] Figure 19 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0219] Figure 20 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0220] Figure 21 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0221] Figure 22 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0222] Figure 23 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0223] Figure 24 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0224] Figure 25 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0225] Figure 26 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0226] Figure 27 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the rotation axis.

[0227] Figure 28 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the axis of rotation, partially as a side view.

[0228] Figure 29 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the axis of rotation, partially as a side view.

[0229] Figure 30 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the axis of rotation.

[0230] Figure 31 Shows a cross-section of a machine connection device and a tool connection device according to an embodiment of the present invention in a plane parallel to the axis of rotation, partially as a side view.

[0231] Figure 32 Shows a detailed view of a cross-section of a contour wall of a tool connection device according to an embodiment of the present invention in a plane parallel to the axis of rotation.

[0232] Figure 33 Shows a top view of a workpiece for manufacturing a tool connection device according to an embodiment of the present invention.

[0233] Figure 34 Shows by Figure 33 The workpiece of a top view of a tool connection device manufactured according to an embodiment of the present invention.

[0234] Figure 35 Shows a top view of a tool device according to an embodiment of the present invention.

[0235] Figure 36 Shows a side view of a combination of a machine tool and a tool device according to an embodiment of the present invention.

[0236] Figure 37 Shows a process flow of a method for manufacturing a tool connection device according to an embodiment of the present invention. Detailed Description

[0237] Figure 1 Shows an exemplary perspective view of a machine connection device 40 according to the prior art. Figure 1 Excerpted from patent document WO2015 / 014468A1. The machine connection device 40 is fastened to the machine tool 50 ( Figure 36) at the lower end of the drive shaft 41, or forms an integral member with the drive shaft 41. In normal use, the drive shaft 41 and thus the machine connection device 40 oscillate about the axis of rotation 10, where the axis of rotation 10 coincides with the longitudinal axis of the drive shaft 41. The machine connection device 40 is defined at its (axial) lower end by the lower end face 49. The upper end face 48 of the machine connection device is located at an axial distance from the lower end face 49. Between the upper end face 48 and the lower end face 49, the machine connection device 40 has a profiled wall 42a in the axial direction, which has an annular basic shape, where the radially outer side is cylindrical in the example shown. There is a cavity or notch inside the annular machine connection device 40, and the volume of this cavity or notch is defined by the machine connection device 40.

[0238] The substantially annular profiled wall 42a forms a closed ring, i.e., without interruption. However, variants can also be considered here, namely, the profiled wall 42a has one or more interruptions, i.e., does not surround 360°.

[0239] On the inner side, the annular profiled wall 42a has an inner profile, which has a contour line 42 surrounding the axis of rotation 10. This contour line 42 extends substantially between the lower end face 49 and the upper end face 48. The inner profile or the contour line 42 tapers in the direction of the axis of rotation 10, more precisely, the region with a smaller inner diameter is closer to the machine tool (or closer to the upper end face 48), while the region with a larger inner diameter is farther from the machine tool (or closer to the lower end face 49).

[0240] However, the cross-section of the contour line 42 in a plane perpendicular to the axis of rotation 10 (i.e., the radial plane) does not have a circular inner diameter for at least the vast majority or at most axial positions, but is similar to a star-shaped polygon, which has twelve convex protrusions 44 extending inwardly towards the axis of rotation 10 and twelve concave recesses 45. Between every two adjacent protrusions 44 or between every two recesses 45, the inner profile 42 has two machine contact surfaces 43 respectively. In the example shown, between two adjacent machine contact surfaces 43, i.e., at the angular positions of the protrusions 44 and the recesses 45, there is a rounded transition (without reference numeral). Looking in the circumferential direction, the course of the inner profile 42 including the machine contact surfaces 43 and the rounded transition therebetween can also be regarded as wavy.

[0241] Due to the conical expansion of the contour line 42, the machine contact surface 43 encloses an angle other than 90° with the radial plane. Thus, they are inclined with respect to the rotation axis 10. In addition, since the machine contact surfaces 43 are arranged in the manner of a star polygon, the following applies. The machine contact surfaces 43 are cut by an infinite number of axial planes (i.e., planes including the rotation axis 10). Without loss of generality, now consider a specific axial plane (not shown in the figure). The intersection of this specific axial plane with the corresponding machine contact surface 43 forms a line. Again without loss of generality, now consider a specific point on this line, which is marked as "X" in Figure 1 . A normal vector 47 is constructed at point X, which points outward from the contour wall 42a. This normal vector 47 does not extend in the axial plane we are considering, but encloses a non-zero angle with this axial plane. Generally speaking, this normal vector 47 is inclined not only with respect to this axial plane but also with respect to the radial plane.

[0242] Finally, the machine connecting device 40 also has two retaining devices or hook-shaped devices 46, which are pivotally mounted around an axis perpendicular to the rotation axis 10. This pivot axis is located in the region of the upper end face 48 or slightly above the upper end face 48. When the retaining device 46 (or its lower end) pivots inward towards the rotation axis 10, the tool device can be fastened to or removed from the machine connecting device 40. When the retaining device 46 (or its lower end) pivots outward from the rotation axis 10, the tool device can be held on the machine connecting device 40 by the combined action of the retaining device 46 and the contour wall 42a. Then, the machine tool 50 and the tool device 30 ( Figure 36 ) form a machine tool and tool device combination 55 and can be used in a desired manner for sawing, grinding, scraping, etc.

[0243] Patent documents WO2015 / 014468A1 and WO2015 / 014469A1 contain more details about the possible designs of the machine tool 50 and the retaining device 46. These documents are hereby expressly incorporated by reference. It should be noted here that a retaining device having only one hook-shaped device 46 or other types of fastening means, such as screws, as described in patent document WO2015 / 014468A1, can also be used.

[0244] has been cited Figure 36 , which shows the machine tool and tool device combination 55. In addition to the details described above, Figure 36It is also shown that the tool device 30 has a working area 21. In the illustrated example, the tool device is located at one end of the tool device 30, and this end is opposite to the end of the tool device 30 that is fastened to the machine tool 50. There is also an alternative embodiment in which the tool device 30 has a plurality of separate working areas 21.

[0245] Between the working area 21 and the tool connection device for fastening the tool device 30 to the machine tool 50, which will be described in detail below, the tool device 30 has a transition part 7. The rotational oscillatory motion is transmitted to the working area 21 through this transition part 7. The transition part 7 can also be regarded as a flange or having a flange, which will be described in more detail below. The flange 7 can also extend beyond the tool connection device in the opposite direction with respect to the working area 21, as Figure 36 shown at the right end of the tool device 30 in the figure.

[0246] Figure 2 A perspective view of the tool connection device 1 according to an embodiment of the present invention is shown. The tool connection device 1 is basically constructed in two axially spaced planes, that is, the first or lower end plane 18 and the second or upper end plane 19, and has a profile wall 2a, which is arranged between or extends between the axially spaced planes 18, 19.

[0247] The tool connection device 1 has a flange 7 or a transition part 7 in the region of the lower end plane 18. In Figure 2 this case, the outer circumference of the flange 7 is circular. In other embodiments, the outer circumference of the flange 7 can also have other shapes.

[0248] As Figure 2 shown, the flange 7 has twelve notches 9 evenly distributed in the circumferential direction. As Figure 2 shown by the dashed circle in the region of the flange 7 in the figure, these notches 9 are located on a (virtual) circle concentrically arranged with respect to the outer circumference of the flange 7. In other embodiments, there can be a different number of notches 9 and their different arrangements. The notches in the flange 7 can be used to fasten the flange 7 to the plate 28 ( Figure 35 ) for example by means of a threaded connection, riveting, welding, etc.

[0249] In certain types of fastening between the flange 7 and the plate 28, the notches 9 are not required in the flange 7, so these notches 9 can also be omitted.

[0250] The plate 28, the flange 7 and / or the tool connection device 1 can be made of, for example, hardened steel plates. However, other sufficiently stable materials can also be considered here. As Figure 35 shown, the plate 28 together with the tool connection device 1 and the flange 7 forms the tool device 30. The working area 21 is in Figure 35is arranged at the right end of the plate 28.

[0251] As Figure 36 shown, the plate 28 can be substantially flat (having a flat top side and a flat bottom side spaced parallel therefrom), but this is not necessary. For example, the plate 28 can be bent at one or more points.

[0252] Although Figure 2 the tool connection device 1 (together with the flange 7 arranged thereon) is shown as an independent component, according to Figure 35 it can also be connected to the plate 28 that was initially separated from it, but the tool connection device 1, the flange 7, and the plate 28 can also be constructed as an integral component (i.e., integrally formed). In particular, the entire tool device 30 can be provided integrally. In this case, the notch 9 in the flange 7 can also be omitted.

[0253] As Figure 2 further shown, the flange 7 is not constructed as a continuous, closed disk, but has a (central) notch (without a reference numeral) in the form of a star polygon, which has twelve (radially) outwardly directed protrusions and twelve (radially) inwardly directed recesses. In Figure 2 it, a protrusion region is shown above the central notch, which forms the tool connection device 1. The tool connection device 1 has a cover part 6 at its upper end (in the region of the upper end plane 19). The cover part 6 also forms a star polygon on its outer periphery with twelve outwardly directed protrusions and twelve inwardly directed recesses. Here, the star polygon formed by the cover part 6 is smaller than the star notch in the flange 7. There is a central opening 20 in the center of the cover part 6. In normal use, for example Figure 1 the hook-shaped device 46 shown can pass through the central opening 20, or one or more other holding devices of the machine tool 50 can extend through the central opening 20 in order to hold the tool connection device 1 or the entire tool device 30 on the machine tool 50.

[0254] When the tool connection device 1 or the tool device 30 is correctly fastened to the machine connection device 40 of the machine tool 50, the rotation axis 10 not only extends centrally through the drive shaft 41 of the machine tool 50, but also extends centrally through the opening 20 of the tool connection device 1. Here, the rotation axis 10 is perpendicular to the cover part 6. When the machine tool 50 is running, the oscillating movement of the drive shaft 41 of the machine tool 50 is also transmitted to the tool connection device 1 or the tool device 30 in the manner described below, such that the tool device 30 also performs an oscillating movement around the rotation axis 10. For this reason, the term "rotation axis 10" is also used in connection with the tool connection device 1 or the tool device 30 accordingly, and the same applies to the term "axial".

[0255] The central opening 20 in the cover part 6 can, for example, have a circular, in particular a perfectly circular, shape, but it can also be of other shapes. In Figure 2 the illustrated embodiment, the central opening 20 has a circular basic shape, on which eight outwardly directed bulges or arms are molded. In addition, as Figure 2 shown, the cover part 6 can also have other notches in addition to the central opening 20, which will be further described below.

[0256] The profile wall 2a of the tool connection device 1 is arranged in or extends in the region between the flange 7 and the cover part 6. The profile wall 2a defines twenty-four contact surfaces 3, which also follow the star-shaped course of the opening in the flange 7 or the star-shaped edge of the cover part 6. The transition between the cover part 6 and the contact surfaces 3 or the transition between the contact surfaces 3 and the flange 7 can have a rounding 8.

[0257] The outwardly directed contact surfaces 3 of the tool connection device 1 are intended to permit (form-fitting) contact with the inwardly directed machine contact surfaces 43, preferably at least partially surface contact. For this purpose, the contact surfaces 3 of the tool device 30 are arranged at least substantially in accordance with the course of the machine contact surfaces 43. That is, the outwardly directed normal vector at a point of the contact surface 3 encloses a non-zero angle with the radial plane. In addition, this normal vector lies on a line that does not intersect the axis of rotation 10. Therefore, this line also encloses a non-zero angle with the axial plane in which the point lies.

[0258] Therefore, when there is such (form-fitting) contact between the contact surfaces 3 and the machine contact surfaces 43 and the tool connection device 1 is held on the machine tool 50 by means of one or more hook-shaped devices or holding devices 46, the tool device 30 is (at least substantially) torsionally resistant and connected to the drive shaft 41 of the machine tool 50.

[0259] In the embodiment according to Figure 2 and in all other embodiments described herein, the contact surfaces 3 can be (substantially) planar, or singly or multiply curved. The term "singly curved" herein means a surface that is curved in only one direction at each point of the surface, such as a cylindrical surface. The term "multiply curved" herein means a surface that is curved in more than one direction at at least one point of the surface, such as a spherical surface. A mixed form can also be considered, for example, the contact surfaces 3 can be planar in one region, singly curved in another region, and multiply curved in another region.

[0260] Since the contact surfaces 3 are arranged in a star shape, each two adjacent contact surfaces 3 form a (radially) outwardly directed projection 4 or a (radially) inwardly recessed portion 5. However, in accordance with Figure 2In the embodiment, the adjacent contact surfaces 3 do not contact each other. A notch 9a or 9b is provided between every two adjacent contact surfaces 3 (in the circumferential direction of the contour wall 2a), and the notch separates the corresponding adjacent contact surfaces 3 from each other. In accordance with Figure 2 In the embodiment, the length of the notch 9a in the region of the protrusion 4 (in the circumferential direction of the contour wall 2a) is greater than the length in the region of the recess 5. According to other embodiments, the notches 9a and 9b may also have the same length, for example, in the circumferential direction of the contour wall 2a.

[0261] Due to the notches 9a and 9b, the moment of inertia of the tool device 30 is reduced as compared to a tool device that does not have these notches and is otherwise similarly made. The following will be combined with the attached Figure 33 and 34 to illustrate other advantages.

[0262] Now refer to the attached Figures 3 to 14 to describe a plurality of embodiments, which can be regarded as Figure 2 variations of the tool connection device 1 shown. Here, Figures 3 to 14 Most of the [figures] only show the cross-section in the radial plane in the region of the contact surface 3, that is, the cross-section at the axial position between the rounding portions 8 when transitioning to the cover portion 6 or the flange 7. In another radial plane, the tool connection device 1 may have a corresponding or similar cross-section, however (due to the tapered design of the contour wall 2a), it has a correspondingly larger or smaller diameter.

[0263] For the sake of clarity, Figures 3 to 14 the cross-sections in the [figures] are shown in a simplified manner.

[0264] For ease of positioning, Figure 3 the cross-sectional view of the [figure] shows that the machine connection device 40 or its contour wall 42a is located in the cross-section perpendicular to the rotation axis between the circle shown by the dashed line on the outside and the Figure 3 outer star-shaped polygon in the [figure]. This circle represents, for example, the cylindrical outer surface of the machine connection device 40. The inner side of the outer star-shaped polygon represents the contour line or the inner contour 42 of the machine connection device 40, on which the machine contact surface 43 is arranged.

[0265] Figure 3 The cross-sectional view perpendicular to the rotation axis also shows the tool connection device 1 or its contour wall 2a between two inner star-shaped polygons. The outer side (solid line) of the outer one of the two inner star-shaped polygons represents the contour line or the outer contour 2 of the tool connection device. The innermost star-shaped polygon shown by the dashed line represents the inner side of the contour wall 2a.

[0266] In this example, the contour line 2 of the tool connection device 1 has twenty-four contact surfaces 3, as well as twelve outwardly directed protrusions 4 and twelve inwardly recessed depressions 5. The contour line 42 of the machine connection device 40 correspondingly has twelve inwardly directed protrusions 44 and twelve outwardly recessed depressions 45.

[0267] The star polygons shown in solid lines, namely the contour line 2 of the tool connection device 1 and the contour line 42 of the machine connection device 40, are shown Figure 3 spaced apart from each other at a certain distance in. This distance is only for clarity. In normal use, due to manufacturing tolerances, these two contour lines 2, 42 will contact at many points or in many surface areas, thereby achieving a form-fit connection between the tool connection device 1 and the machine connection device 40.

[0268] In Figure 3 it is different from Figure 2 in that no notches 9a, 9b are shown between adjacent contact surfaces 3. However, these may exist, especially in a radial plane different from the one shown in the cross-sectional view. In other words, according to this embodiment, the contour line 2 (i.e., the outer contour of the tool connection device 1) at least substantially corresponds to the contour line 42 (i.e., the inner contour of the machine connection device 40) at least in the shown radial plane and, if necessary, also in other radial planes. On the other hand, in one or, if necessary, in multiple (not shown) radial planes, the contour line 2 is different from the contour line 42.

[0269] Figures 4 to 14 Shows Figure 2 or Figure 3 more variants of the tool connection device 1 shown. The presentation style of these illustrations basically follows Figure 3 and, for the sake of compactness and clarity, features that have already been described will not be repeated, and corresponding reference numerals will not be provided if necessary. In addition, in Figures 4 to 14 the display of the outer side of the contour wall 42a of the machine connection device 40 ( Figure 3 the dashed circle of Figure 3 ) and the inner side of the contour wall 2a of the tool connection device 1 (

[0270] is different from the embodiment in Figure 3 and in Figure 4The embodiment in [[ ]] has a differential region 13. In this differential region, the contour line 2 of the tool connecting device 1 does not follow or correspond to the contour line 42 of the machine connecting device 40. Although the contour line 42 of the machine connecting device 40 has (only) one recess 45 that is recessed outwardly formed by two machine contact surfaces 43 in this differential region 13, the contour line 2 of the tool connecting device 1 has two outwardly directed protrusions 4 formed by a total of four contact surfaces 3 and an inwardly recessed recess 5 located between these two contact surfaces in this differential region 13. Therefore, the contour line 2 is different from the contour line 42 in this differential region 13, and it extends radially inwardly and is spaced apart from the contour line 42 by a certain distance in this region, that is, it extends inside the volume defined by the contour line 42. Therefore, in the illustrated embodiment, the contour line 2 has a total of thirteen protrusions 4 and thirteen recesses 5.

[0271] Figure 5 The variant shown in [[ ]] has a larger differential region 13 or three separate differential regions 13. Although in this / these differential regions 13, the contour line 42 has three recesses 45 that are recessed outwardly formed by a total of six machine contact surfaces 43, in this / these differential regions 13, the contour line 2 has six outwardly directed protrusions 4 formed by a total of twelve contact surfaces 3 and corresponding recesses 5 formed therebetween. The contour line 2 again extends radially inwardly and is spaced apart from the contour line 42 by a certain distance in this region, that is, it extends inside the volume defined by the contour line 42.

[0272] In other variants not shown, the differential region 13 can be larger or smaller, or there can be more or fewer differential regions 13.

[0273] In Figure 6 In another illustrated embodiment, the running shape of the contour line 2 is not limited to Figure 4 or Figure 5 the shape shown in [[ ]]. According to Figure 6 , the contour line 2 has a protrusion 4 in (the or a) differential region 13, and this protrusion has a shape different from other protrusions. Although in Figures 3 to 5 the embodiment of [[ ]], the contact surfaces 3 of the contour line 2 (measured in the illustrated radial plane) form an internal angle of (about) 120° at the outwardly directed protrusion 4 and an internal angle of (about) 210° at the recess 5, but internal angles with other values can also be found in Figure 6 the embodiment of [[ ]]. For example, in the recess marked with the reference numeral 5, the internal angle is (about) 270°. In other variants not shown, the contour line 2 can also have other shapes, especially contact surfaces 3 with different internal angles and / or different sizes, etc.

[0274] In Figure 7In another embodiment shown, the inner angle of the outwardly directed protrusion of the contour line 2 identified by reference numeral 4 is (apparently) less than 120°, approximately 60°. Thus, at this point, no surface contact is (substantially) formed between the contour line 2 and the contour line 42, but rather (when the contour line 2 is appropriately axially extended) line contact is formed, which, however, appears as point contact only in the Figure 7 two-dimensional view.

[0275] Figure 8 Two embodiments are shown. In the first embodiment shown only in solid lines, the contour line 2 of the tool connection device 1 coincides (substantially) with the contour line 42 of the machine connection device 40 for the most part (i.e., in the first sub-region or consistent region 12). In contrast, in the second sub-region or different region 13, the contour line 2 is different from the contour line 42, wherein in the sub-region 13, the contour line 2 connects two outwardly directed protrusions to two upper protrusions identified by reference numeral 4 through a (substantially) flat surface 14a, although there is another outwardly recessed portion 45 of the contour line 42 of the machine connection device 40 "in between". In the second sub-region or different region 13, the contour line 2 extends inside the volume defined by the contour line 42. In this embodiment, the contour line 2 has only eleven outwardly directed protrusions 4 and ten inwardly recessed portions 5.

[0276] In Figure 8 the second embodiment shown, another protrusion 4 of the contour line 2 is replaced by a (substantially) flat surface 14a, as shown by the dashed line. The above description applies equally. In this embodiment, the contour line 2 has only ten protrusions 4 (or only nine protrusions 4, in which case the upper right protrusion is not considered a protrusion because there is no recess 5 between this protrusion and the adjacent protrusions 4 (upper left and right)). In addition, in this embodiment, the contour line 2 has only eight recesses 5.

[0277] In some variants, there may be a different number or arrangement of connecting surfaces 14a, as long as there is at least one protrusion 4.

[0278] Figure 9 An embodiment is shown in which the contour line 2 again coincides (substantially) with the contour line 42 in the first sub-region 12. The first sub-region 12 extends at an angle α (here called the consistent angle) of (approximately) 210° with respect to the rotation axis 10. Compared with the Figure 3 embodiment in, a part of the star-shaped contour line 2, namely the part that extends over an angle β (here called the different angle) of more than (approximately) 150° in the second sub-region or different region 13, is replaced by a curved connecting surface 14b. In this embodiment, the contour line 2 also extends inside the volume defined by the contour line 42. Here, the curved connecting surface 14b may or may not abut against the inwardly directed protrusion 44 of the contour line 42 of the machine connection device 40.

[0279] In a variant of this embodiment, a plurality of second sub-regions or difference regions 13 and first sub-regions or coincidence regions 12 located therebetween may also be provided. In these second sub-regions or difference regions 13, the contour line 2 is different from the contour line 42, and in these first sub-regions or coincidence regions, the contour line 2 is (substantially) coincident with the contour line 42. In addition, the second sub-regions or coincidence regions 13 may be larger or smaller than Figure 9 that shown. Similarly, the shape of the contour line 2 in the second sub-region 13, i.e., the curved connecting surface 14b, may be different from Figure 9 that shown in

[0280] Figure 10 shows a Figure 9 variant. In the Figure 10 embodiment, only one protrusion 4 and two adjacent recesses 5 of the contour line 2 of the tool connection device 2 are provided. The region between the two recesses 5 forms a coincidence region or first sub-region 12. In the first sub-region 12 with a coincidence angle α extending across (about) 30°, the contour line 2, i.e., the contact surfaces 3a and 3b, is (substantially) coincident with the contour line 42. In a much larger difference region or second sub-region 13 (which extends across a difference angle β of (about) 330°), the contour line 2, i.e., the connecting surface 14b, is different from the contour line 42. However, preferably, the curved connecting surface 14b contacts the contour line 42 of the machine connection device 40 at least on (this or some) inwardly directed protrusions 44, so that a form-fit is generated only through the contact between the contour line 2 of the tool connection device 1 and the contour line 42 of the machine connection device 40, and thus the tool device 30 can be torsionally connected to the machine tool 50. If the curved connecting surface 14b does not contact the contour line 42, a form-fit and torsional connection between the tool device 30 and the machine tool 50 can still be generated in the following way: the tool device 30 is held on the machine tool 50 by (a plurality of) hook-shaped devices or holding devices 46 on the one hand, and on the other hand, there is contact between the contour line 2 and the contour line 42 in the coincidence region 12. For certain applications, this can be a way to sufficiently fasten the tool device 30 to the machine tool 50.

[0281] Figure 11 The embodiment of Figure 10 is mostly consistent with the Figure 11 embodiment. However, the two (substantially flat) contact surfaces 3a and 3b in Figure 10 are larger than the case in Figure 11is also identified by reference numeral 4, although strictly speaking it is not an outwardly directed projection since the contour line 2 (at least in the section shown) does not have an inwardly recessed portion 5. Similar to Figure 10 , the contact surfaces 3a and 3b are connected by a curved connecting surface 14b. Preferably, in an embodiment according to Figure 11 , the curved connecting surface 14b also contacts the contour line 42 of the machine connecting device 40 at least at the inwardly directed projection 44, but this is not mandatory. For the form-fit or anti-twist fastening between the tool device 30 and the machine tool 50, reference is made to the corresponding embodiments related to Figure 10 .

[0282] Figure 12 shows another variant of an embodiment according to Figure 3 . In an exemplary embodiment according to Figure 12 , the cross-section of the tool connecting device 1 shown in solid lines forms a hexagon, but not a regular hexagon, but rather one in which two opposite sides are significantly longer than the remaining sides. On the four shorter sides, the tool connecting device 1 has four contact surfaces 3a and 3b, on which the contour line 2 of the tool connecting device 1 (substantially) coincides with the contour line 42 of the machine connecting device 40, so these areas represent the coincidence areas 12. (Much larger) difference areas 13 extend in the remaining part of the circumference of the tool connecting device 1 or the machine connecting device 40.

[0283] Figure 12 Also shown in dashed lines are two possible arrangements of the central opening 20 for fastening the tool device 30 to the machine tool 50, as well as the flange or transition 7 and the working area 21. In the variant in which the working area 21 is arranged in the Figure 12 upper right, the transition 7 extends substantially perpendicularly outward from the center of one of the long sides of the hexagon. In the variant in which the working area 21 is arranged in the Figure 12 lower right, the transition 7 extends in the same direction as the long side of the hexagon and forms a so-called outward extension of the hexagon. The contour line 2 and the transition 7 can also have other shapes, sizes and directions.

[0284] Figure 13 shows a variant of Figure 12 in which the contour line 2 does not form a hexagon here, but rather compared to Figure 12The embodiment of [the tool connection device] is bent in a curved form such that each of the opposing contact surfaces 3a or 3b does not contact the respective machine contact surfaces 43 that are symmetrically opposite to each other with respect to the axis of rotation 10, but instead contacts the machine contact surfaces 43 that are each offset by 150° with respect to the axis of rotation 10. The two resulting congruent regions 12 each extend by an angle of 30° in this embodiment. The larger of the two differential regions 13 extends by an angle of 180°, and the smaller differential region extends by an angle of 120°. In this embodiment, the two congruent regions together form a congruent angle of 60°, and the two differential regions together form a differential angle of 300°. The form-fitting or torsion-resistant fastening between the tool device 30 and the machine tool 50 can be achieved only by the contact on the contact surfaces 3a and 3b, and, if necessary, also by fastening the tool device 30 in the region of the central opening 20 by means of a retaining device or a hook-shaped device 46. In some cases, the transition region 7 can also be located on the underside of the machine connection device 40, whereby, if the tool device 30 is clamped to the machine connection device 40 by means of a retaining device or a hook-shaped device 46, the contact between the contact surfaces 3a or 3b and the respective machine contact surfaces 43 can be improved if necessary.

[0285] Figure 14 shows another variant of an embodiment according to Figure 12 [the tool connection device]. In the Figure 14 embodiment shown, the profile wall 2a contacts the respective machine contact surfaces 43 only in the regions of two adjacent contact surfaces 3a and 3b. The form-fitting or torsion-resistant fastening between the tool device 30 and the machine tool 50 can be achieved only by the contact on the contact surfaces 3a and 3b and by fastening the tool device 30 in the region of the central opening 20 by means of a retaining device or a hook-shaped device 46. In some cases, the transition region 7 can also abut against the underside of the machine connection device 40, whereby, if the tool device 30 is clamped to the machine connection device 40 by means of a retaining device or a hook-shaped device 46, the contact between the contact surfaces 3a or 3b and the respective machine contact surfaces 43 can be improved if necessary.

[0286] It has been exemplarily illustrated above with the aid of Figures 2 to 14 the degree to which the contour line 2 of the tool connection device 1 can differ from the contour line 42 of the machine connection device 40 in the circumferential direction. However, a difference between the contour line 2 and the contour line 42 can also exist, particularly partially, in the axial direction or axial extension of the tool connection device 1. This will be illustrated according to Figures 15 to 31 multiple embodiments of [the tool connection device].

[0287] The difference between the contour line 2 and the contour line 42 can also exist not only in the circumferential direction (as Figures 2 to 14 described), but also in the axial direction (as will be described below according to Figures 15 to 31as described). In other words, each difference in the circumferential direction, or rather Figures 2 to 14 each difference in the illustrated embodiment can be combined with each difference in the axial direction, or rather Figures 15 to 31 each difference in the illustrated embodiment within the framework of the present invention. In addition, the tool device 30 can also have various types of differences in the circumferential direction and / or various types of differences in the axial direction, if necessary, in different cross-sections and / or within different angular ranges with respect to the rotation axis 10.

[0288] Figure 15 Fig. shows a cross-section of the machine connection device 40 and the tool connection device 1 according to an embodiment of the present invention in a plane parallel to the rotation axis 10.

[0289] In Figure 15 , the rotation axis 10 extends vertically in the illustrated plane. The machine connection device 40 is arranged symmetrically or coaxially around the rotation axis 10. Due to the inclination of the contour line or the inner contour 42 of the machine connection device 40, the space below the machine connection device 40 forms a trapezoid in the shown cross-section. Two hook-shaped devices 46 of the machine tool 50 are also shown in the figure, for fastening the tool device 30 or for clamping the outer contour 2 of the tool connection device 1 on the inner contour 42 of the machine connection device 40. In Figures 15 to 31 , for the sake of clarity, the contour line 2 of the tool connection device 1 is again at a certain distance from the contour line 42 of the machine connection device 40. However, in normal use, the contour line 2 abuts against the contour line 42 at least in some areas.

[0290] As Figure 15 shown, the tool device 30 has a flange or transition portion 7, at one end of which a working area 21 is provided. The flange 7 (with respect to the rotation axis 10) is located in the region of the first (lower) end plane 18 shown by a dashed line. The tool connection device 1 projects beyond the flange 7 with a contour wall 2a having a contour 2 (shown here as a trapezoid). In the region of the second (upper) end plane 19 shown by a dashed line, a cover portion 6 is connected to the upper end of the contour wall 2a, and this cover portion also forms part of the tool connection device 1. The cover portion 6 has the aforementioned central opening 20, and the hook-shaped device 46 or other holding device 46 extends through this central opening.

[0291] The contour line 2 of the tool connection device 1 substantially corresponds to the contour line 42 of the machine connection device 40 in the Figure 15 shown cross-section, but this is not necessarily the case over the entire circumference of the tool connection device 1. In a cross-section (not shown) different from the Figure 15 shown cross-section, the contour line 2 can be different from the contour line 42, for example, according to Figures 2 to 14 one of the examples shown or one of the examples described below according to Figures 16 to 31 one of the examples.

[0292] In Figures 16 to 31 some of the features of the tool device 30 or the combination of the tool connection device 1 and the machine connection device 40 shown correspond to the features described with reference to Figure 15 and will not be repeated here. Only the features that are different between the embodiments shown Figures 16 to 31 and the embodiments shown Figure 15 will be mainly described below. In addition, the hook device 46, the rotary shaft 10, and the end planes 18 and 19 are not shown in Figures 16 to 31 . It should also be noted that in some of the figures in Figures 16 to 31 , different features are shown in the right half and the left half. This can be understood as the embodiments shown in these figures may have different features at different circumferential points, particularly at opposite points. On the other hand, these drawings should also be understood as representing two different embodiments, that is, within the framework of the present invention, the tool device 30 can be designed according to the left half or the right half of these drawings.

[0293] In Figure 16 (left side), the contour line 2 of the tool connection device 1 does not extend parallel to the contour line 42 of the machine connection device 40, but (substantially) parallel to the rotary shaft 10, more precisely over its entire axial extension. In this case, the contour line 2 only abuts against the machine connection device 40 at its upper end. Therefore, a notch 9 is created in the space between the contour line 2 and the contour line 42 (shown as a triangle in Figure 16 ). On the other hand, in Figure 16 (right side), the contour line 2 extends as shown in Figure 15 .

[0294] In Figure 17 (left side), the contour line 2 of the tool connection device 1 also does not extend parallel to the contour line 42 of the machine connection device 40, but (partially) parallel to the rotary shaft 10, but not over its entire axial extension. Instead, the contour line 2 has a step 17, and the contour line 2 extends (substantially) in a radial plane at the step. For example, the step 17 can be arranged approximately in the middle between the upper and lower end planes 18, 19, or at another axial position. In this case, the contour line 2 only abuts against the machine connection device 40 at its upper end and at the level of the step 17.

[0295] In Figure 17 (right side), the contour line 2 has two steps. These steps can divide the axial extension of the tool connection device 1 into axial segments of the same size or (as shown) different sizes. In addition, more than two steps are also possible. In other respects, the foregoing description regarding Figure 17 (left side) applies accordingly.

[0296] In Figure 18 (the left side), the contour line 2 also has a step 17. However, at this step 17, the contour line 2 does not extend in a radial plane but only changes its inclination. Above the step 17, the inclination of the contour line 2 of the tool connection device 1 basically corresponds to the inclination of the contour line 42 of the machine connection device 40. Below the step 17, the contour line 2 extends (basically) parallel to the rotation axis 10.

[0297] In Figure 18 (the right side), the contour line 2 again has a step 17. At this step 17, the contour line 2 extends (basically) in a radial plane. In addition, the inclination of the contour line 2 changes at this axial position. Below the step 17, the inclination of the contour line 2 of the tool connection device 1 basically corresponds to the inclination of the machine connection device 40. Above the step 17, the contour line 2 extends (basically) parallel to the rotation axis 10.

[0298] In Figure 19 (both sides), the contour line 2 has (relatively large) rounding portions 8 at its upper end. These rounding portions extend over a larger area than the possible rounding portions at the corresponding parts of the upper end of the contour line 42 of the machine connection device 40, that is, the rounding portions 8 of the tool device 30 can have a larger radius of curvature than the possible rounding portions of the machine connection device 40. Below the rounding portions 8, the inclination of the contour line 2 of the tool connection device 1 can basically correspond to the inclination of the contour line 42 of the machine connection device 40.

[0299] In Figure 20 (the left side), the contour has a step 17. Above the step 17, the inclination of the contour line 2 of the tool connection device 1 basically corresponds to the inclination of the contour line 42 of the machine connection device 40. However, below the step 17, the contour line 2 does not extend parallel to the rotation axis 10 (as Figure 17 shown), but only changes its inclination. Also in this part, the distance between the contour line 2 and the rotation axis 10 increases as the distance from the cover part 6 increases. Below the step 17, the contour line 2 is steeper than above. The opening angle of the tool connection device 1 in this part is smaller than the opening angle of the tool connection device 1 above the step 17 and also smaller than the opening angle of the corresponding part of the machine connection device 40.

[0300] In Figure 20In the middle (right side), the contour line also has a step 17. Below the step 17, the inclination of the contour line 2 of the tool connection device 1 substantially corresponds to the inclination of the contour line 42 of the machine connection device 40. However, the contour line 2 does not extend in a radial plane at the level of the step 17, nor is it parallel to the rotation axis 10 above the step 17, but only changes its inclination. In this part, the distance of the contour line 2 from the rotation axis 10 also increases as the distance from the cover part 6 increases. Below the step 17, the contour line 2 is steeper than above. The opening angle of the tool connection device 1 in this part is greater than the opening angle of the tool connection device 1 below the step 17 and also greater than the opening angle of the corresponding part of the machine connection device 40.

[0301] In Figure 21 (left side), the contour has a step 17. Above the step 17, the inclination of the contour line 2 of the tool connection device 1 substantially corresponds to the inclination of the contour line 42 of the machine connection device 40. Below the step 17, the contour line 2 does not extend parallel to the rotation axis 10 but changes its inclination. However, contrary to the example of Figure 20 (left side), in this part, the distance of the contour line 2 from the rotation axis 10 decreases as the distance from the cover part 6 increases.

[0302] In Figure 21 (right side), the contour does not have a step 17. However, the inclination of the contour line 2 of the tool connection device is different from the inclination of the contour line 42 of the machine connection device 40, such that the distance of the contour 2 from the rotation axis 10 decreases as the distance from the cover part 6 increases. In this case, the contour line 2 only abuts against the machine connection device 40 at its upper end.

[0303] Figure 22 The embodiment shown in Figure 15 differs from the embodiment shown in that: the contour wall 2a has a shorter axial extension on the left side than on the right side. In particular, the contour wall 2a on the left side does not project (downward) beyond the machine connection device 40. In this embodiment, the contour wall 2a can also be shortened at other points in the circumferential direction, especially at the same level as the leftmost side, as shown by the dotted line. Only in the right side region, near the transition part 7, does the axial extension of the contour wall 2a expand. Alternatively, the axial extension of the contour wall 2a can gradually increase during its circumferential extension until the region of the transition part 7, as shown by the inclined dotted line in the figure.

[0304] Figure 23 The embodiment shown in Figure 22The extreme case of the embodiment. At the left end of the cover part 6, the contour wall 2a which the tool device 30 does not extend under the cover part 6 at all. That is to say, due to the limited material thickness of the cover part 6, the axial extension of the cover part 6 at its left edge represents the contour wall 2a. In this case, especially when the left edge of the cover part 6 is parallel to the rotation axis 10, the cover part 6 (contour 2) may only abut against the machine connecting device 40 at its upper end. Figure 23 A variant is shown in a separate circle, which describes the enlarged part at the left end of the cover part 6 (see the small circle). When the left edge of the cover part 6 does not extend parallel to the rotation axis 10, but is inclined, such that the inclination of this inclined edge of the contour line 2 basically corresponds to the inclination of the contour line 42 of the machine connecting device 40, then even in this area, there may be a very small surface contact between the tool connecting device 1 and the machine connecting device 40. The contour wall 2a can protrude in the direction towards the transition part 7 (i.e., to the right), and its height increases to the right. The height of the contour wall 2a can increase uniformly (in the circumferential direction), as shown by the inclined dotted line. Alternatively, the height of the contour wall 2a can also increase non-uniformly, as shown by the dash-dotted line.

[0305] Figure 24 The embodiment shown in basically corresponds to Figure 13 the embodiment of. In Figure 24 the embodiment, the cover part 6 does not extend to the leftmost side of the inclined contour line 42 of the machine connecting device 40. Instead, on the cover part 6, more precisely at the points corresponding to the positions of the contact surfaces 3a and 3b in Figure 13 , the contact surfaces 3a and 3b are molded. The tool connecting device 1 can be supported on the machine connecting device 40 through these contact surfaces. In addition, the tool connecting device 1 can be supported on the machine connecting device 40 in the right area, i.e., in the direction along the transition part. Optionally, the contour wall 2a can also protrude in the direction towards the transition part 7 (i.e., to the right) starting from the shown contact surfaces 3a, 3b, and its height increases to the right. The height of the contour wall 2a can increase uniformly (in the circumferential direction), as shown by the inclined dotted line.

[0306] Figure 25 The embodiment shown in can be regarded as Figure 24 a variant of, and has been described in combination with Figure 13 . Compared with Figure 24In comparison with the embodiment of , the contour line 2 of the tool connecting device 1 does not extend steeper in the right half than the contour line 42 of the machine connecting device 40. Thus, there is no contact between the contour wall 2a and the contour wall 42a in this region. Alternatively, a form-fitting connection between the tool device 30 and the tool machine 50 can be achieved in such a way that the contact surfaces 3a and 3b bear against the contour wall 42a, and in addition the tool device 30 is held on the tool machine 50 by means of a hook-shaped device or other retaining means 46. If necessary, the flange 7 can also bear against the underside of the machine connecting device 40 as described above.

[0307] In the embodiment according to Figure 26 the contour line 2 of the tool connecting device 1 can (at least partly) coincide substantially with the contour line 42 of the machine connecting device 40. Different from the embodiment according to Figure 15 in which the entire tool connecting device 1 can be manufactured with a substantially constant wall thickness, according to Figure 26 the wall thickness (i.e., the thickness) td in the region of the cover part 6 is different from the wall thickness tk in the region of the contact surface 3 or the contour line 2. The wall thickness tk can in particular be greater than the wall thickness td, for example at least twice the wall thickness td.

[0308] Also in the embodiment according to Figure 27 the wall thickness tk in the region of the contact surface 3 or the contour line 2 can also be greater than the wall thickness td in the region of the cover part 6. Here, the contour wall 2a can be configured as double-walled, having an inner wall 22 and an outer wall 23. In the Figure 27 left part of , they are substantially parallel to each other and also parallel to the machine contact surface 43. Here, the material thicknesses of the inner wall 22 and the outer wall 23 can be the same or different, and can also be the same or different from the wall thickness td of the cover part 6. However, in such a double-walled or multi-walled contour wall 2a, the wall thickness tk is the total thickness of the contour wall 2a, i.e., in the illustrated example, the sum of the material thicknesses of the inner wall 22 and the outer wall 23 and the spacing between them. Here, the wall thickness tk can be measured in a radial plane, as indicated by the upper double arrow in the Figure 27 left half. However, the wall thickness tk can also be measured in a direction perpendicular to the respective contact surface 3, as indicated by the lower double arrow in the Figure 27 left half. This results in (slightly) different values of the wall thickness tk.

[0309] In the Figure 27 embodiment shown in the right half of , although the outer wall 23 extends parallel to the machine contact surface 43, the inner wall 22 does not. The inner wall 22 can for example be parallel to the rotation axis 10. In this case, the wall thickness tk can for example be defined as the minimum or maximum value of all wall thicknesses in the region of the contact surface 3, or as defined as the average value as shown in Figure 27 .

[0310] InFigure 28 and Figure 29 shows in cross-section the machine connection device 40 as shown in the previous figure, and shows the tool connection device 1 in a side view. Accordingly, the contour wall 2a of the tool connection device 1 is depicted as having a plurality of contact surfaces 3 and, alternating therebetween, outwardly directed protrusions 4 and inwardly recessed portions 5. A plurality of types of notches 9 are shown in the contour wall 2a. These notches can represent different embodiments, and two or more different notches 9 can also be provided in the contour wall 2a of a single embodiment here. In the example shown, the notch 9 can be, for example, serrated (left), bar-shaped (middle), or circular / elliptical (right). A single notch 9 can be restricted to one contact surface 3, or can extend across two or more contact surfaces 3.

[0311] Figure 29 Shows further examples of the notches 9 in the contour wall 2a, which can have a wavy or broken-line shape.

[0312] Although according to Figure 28 or 29, the contour line 2 of the contour wall 2a is interrupted by the notch 9 during its extension and thus differs from the contour line 42 of the machine connection device 40 at least at the height of the notch 9, at other axial positions, that is, outside the notch 9, it can coincide with the contour line 42 of the machine connection device 40 if necessary.

[0313] Figure 30 Shows features that can be combined with any other embodiment described herein. In Figure 30 the left half of, the cover part 6 has a notch 25, that is, a downwardly directed recess. In contrast, in Figure 30 the right half of, the cover part 6 has a protruding region 24. The downwardly directed notch 25 or the protruding region 24 is configured as a blind-hole notch (Sacklochausnehmungen), that is, closed at the axial end. Alternatively, the axial end can also be open. Similarly, the notch 25 can also be configured as a through-hole instead of a blind-hole notch.

[0314] The notch 25 and the protruding region 24 can cooperate with the corresponding features 26 and 27 of the machine connection device 40. In particular, the notch 25 and the protruding region 24 can be used as coding devices, for example, such that the tool device 30 can only be mounted relative to the machine tool 50 in a specific direction, or to ensure the compatibility of the tool device 30 with machine tools from different manufacturers or specific types of machine tools from a specific manufacturer. One or more such or other types of coding devices can be provided on the cover part 6.

[0315] With Figure 28 and Figure 29 similar, Figure 31The machine connection device 40 is shown in cross-section, and the tool connection device 1 is shown in a side view. Accordingly, the contour wall 2a of the tool connection device 1 has a plurality of contact surfaces 3 and, alternating therebetween, outwardly directed protrusions 4 and inwardly recessed portions 5.

[0316] The contour wall 2a has a plurality of notches 9, 9a or 9b. As shown in the middle and left portions, the wider notches 9a and the narrower notches 9b can alternate (in the circumferential direction). For example, the wider notches 9a can be arranged on some or all of the protrusions 4 of the side wall 2a, while the narrower notches 9b can be arranged on some or all of the recessed portions 5 of the side wall 2a, as Figure 2 shown. Here, the notches 9a and 9b can have a similar shape and have the same length and position in the axial direction, as Figure 31 shown in the left half. In contrast, Figure 31 the right half shows notches 9 at different axial positions and having a different length (in the axial direction) than the left half.

[0317] Figure 32 A detailed view of the tool device 30 according to an embodiment of the invention in a plane parallel to the rotation axis 10 is shown in cross-section. The portion shown shows the contour wall 2a, a part of the cover portion 6, and the transition portion 7 and the working area 21. In addition, Figure 32 a rounding portion 8 at the transition from the contour wall 2a to the cover portion 6 or to the transition portion 7 is also shown. As previously mentioned, the cover portion 6 is arranged in the region of the upper end plane 19, and the transition portion 7 is arranged in the region of the lower end plane 18. As Figure 32 shown, the contour wall extends between the rounding portions 8 and thus has an axial extension Ep. The tool connection device as a whole or the distance between the lower end plane 18 and the upper end plane 19 has an axial extension Ew. Depending on the size of the rounding portion 8, the contour wall 2a of the tool connection device 1 can extend over an axial region Ep that is less than 100% of the extension Ew of the tool connection device 1, for example, a maximum of 90%, or a maximum of 80%, or a maximum of 70%, or a maximum of 60%, or a maximum of 50% of the axial extension Ew of the tool connection device 1. If the rounding portions 8 have the same axial extension, the contour wall 2a can be arranged centrally with respect to the axial extension Ew of the tool connection device 1; otherwise, it cannot be arranged centrally with respect to the tool connection device.

[0318] In other variants not shown in the drawings, which can be based on each embodiment described herein, the central opening 20 of the tool device 30 forms part of a radial (e.g., U-shaped) opening in the cover part 6, which radial opening extends along a radial line to the edge of the cover part 6. The radial line along which the radial opening in the cover part 6 extends can form a non-0° angle with the longitudinal axis of the tool device 30, for example in the range of approximately 120° to 150°. Connected to the radial or U-shaped opening in the cover part 6 is an opening or interruption in the contour wall 2a such that the tool device 30 is open towards one side. This provides for the use of such a tool device 30 in machine tools 50 having an output shaft or an oscillating shaft and having a clamping member at the lower end of the output shaft, the cross-section of which is larger than the cross-section of the central opening 20 of the tool device 30. For such a machine tool 50, the tool device 30 is guided from the side to the output shaft until the central opening 20 of the tool device 30 is positioned concentrically with the output shaft and is then clamped by the clamping member at the lower end of the output shaft (optionally in cooperation with a clamping member arranged further above on the output shaft). In these variants, the U-shaped opening in the cover part 6 and the opening or interruption in the contour wall 2a connected thereto can have a substantially constant or variable width. For example, the U-shaped opening in the cover part 6 and the opening or interruption in the contour wall 2a connected thereto can be defined by two (at least partially) substantially parallel edges in the cover part 6 or the contour wall 2a.

[0319] The manufacturing method of the tool connection device 1 will now be described with reference to the attached Figure 33 、 Figure 34 and Figure 37 herein. Here, Figure 33 and Figure 34 show different stages in the manufacturing method of the tool connection device 1, while Figure 37 generally shows the method flow.

[0320] After the start 80 of the method, in step 81, a workpiece 60 for manufacturing the tool connection device 1 is provided. The workpiece 60 can initially be, for example, a flat disk 60, for example made of hardened steel plate. The disk 60 thus has a flat area 61, which, however, extends over the entire disk 60 in this embodiment. The material thickness of the disk 60 can be, for example, in the range between 0.75 mm and 3 mm, preferably between 1 mm and 1.5 mm. The workpiece 60 can initially be without any contours, notches, etc.

[0321] In step 82, the disk 60 is provided with a plurality of notches, in particular a central opening 20 and a plurality of notches 62, 63, 64 arranged around the central opening 20. According to the embodiment, these notches 62 to 64 can here have different shapes and sizes and are arranged at different radii from the center of the disk 60.

[0322] Figure 33 Shows three different types of notches 62 to 64 located at different radii. The middle radius is represented by a dashed circle. In this embodiment, the disk 60 has notches 63 regularly distributed around the circumference at this middle radius, with each notch separated by 15°. However, for clarity, only three such notches 63 are shown. These notches 63 are located in a (circular) region that will later form the contour wall 2a of the tool device.

[0323] The notches 64 on the outer radius (near the outer circumference of the disk 60) can also be evenly distributed circumferentially, for example, each notch separated by 30°, as Figure 33 shown. These notches 64 can serve as solder joints or as through-holes for screws, rivets, etc. for later connection to the plate 28 ( Figure 35 ), as described above.

[0324] The notches 62 on the inner radius can be used as coding devices as described above, or to ensure compatibility with different types of machine tools. Here, only two notches 62 separated by 30° are shown. More notches 62 can be provided accordingly, such that the disk 60 can have, for example, twelve notches 62 in this region.

[0325] In the next method step 83, the initially flat disk 60 is deformed, for example, by a deep drawing process or the like, in order to transfer the disk 60 into the three-dimensional tool connection device 1 shown in Figure 34 . In this method step 83, the inner region of the disk 60 (in this example, the region represented by the interior of the two star polygons in Figure 34 and whose outer edge extends between the notches 62 and 63) is offset relative to the outer ring (the notches 64 are located in this outer ring and are represented in Figure 34 outside the larger polygon of the two star polygons) such that this inner region lies in a different radial plane from the outer ring.

[0326] As Figure 34 shown, the inner region forms the cover part 6 of the tool connection device 1. In contrast, the outer ring is the transition part or flange 7. The intermediate region between the two star polygons shown in Figure 34 forms the contour wall 2a, which extends between the flange 7 and the cover part 6, and whose contact surface 3 is inclined both relative to the (radial) plane in which the flange 7 lies and relative to the axis of rotation 10 perpendicular to the plane of the drawing. Since the three-dimensional structure of the tool connection device 1 is not obvious in the two-dimensional drawing in Figure 34 , reference is also made (again) to Figure 2 .

[0327] By the deformation occurring in step 83, Figure 33The notch 63 will also deform. Through this deformation (e.g., by deep drawing), the notch 63 first becomes longer ("higher"), and in the Figure 34 two-dimensional illustration, the radial extension of the notch 63 (marked as notches 9a and 9b in Figure 34 ) is increased. Secondly, through this deformation, those notches 63 that will ultimately be located at the positions of the outwardly directed protrusions 4 of the contour wall 2a become wider (in the circumferential direction), and in Figure 34 it is notch 9a. On the other hand, through this deformation, those notches 63 that will ultimately be located at the positions of the inwardly recessed portions 5 of the contour wall 2a become narrower (in the circumferential direction), and in Figure 34 it is notch 9b.

[0328] After step 83, the method can end (step 84).

[0329] As mentioned above, providing notches 9a or 9b at the positions of the protrusions 4 or recesses 5 can improve the torque transmission capacity, as compared with a tool connection device that is otherwise basically the same but has a rounded portion instead of a notch between adjacent contact surfaces 3. This improved torque transmission capacity is attributed to the fact that the torque is mainly or even only transmitted from the machine connection device 40 to the tool connection device 1 through the contact surfaces 3, rather than (or only a small part) through the rounded portion between two adjacent contact surfaces 3 to the tool connection device 1. However, due to manufacturing reasons, such a rounded portion needs to have a certain length in the circumferential direction, especially in order to disperse the material stress that occurs during the deep drawing process to a large enough area. In the case where the edges between the two contact surfaces 3 are sharp, the material may break at this position during the deep drawing process. The inventors have found that the cumulative total length of all notches 9a or 9b (in the circumferential direction) can be designed to be less than the cumulative total length required for such rounding (in the circumferential direction). In other words, despite the presence of notches 9a and 9b or precisely because of these notches, the total area of the contact surfaces 3 can be larger than that of an otherwise identical embodiment with a rounded portion between the contact surfaces 3. The increased area in this way can correspondingly transmit a greater torque.

[0330] As a Figure 33 and Figure 34 variant of the illustrated embodiment, the dimensions of the notch 63 can also be designed differently. In particular, in step 82, those notches 63 that are provided for the positions of the protrusions 4 and will later form notches 9a can be designed to be narrower in the circumferential direction than those notches 63 that are provided for the positions of the recesses 5 and will later form notches 9b. Through appropriate dimensioning, notches 9a and 9b can have substantially the same length in the circumferential direction after deep drawing if necessary.

[0331] List of reference numerals

[0332] 1 Tool connection device

[0333] 2 Outer contour of the contour line / tool connection device

[0334] 2a Contour wall (of the tool device)

[0335] 3 Contact surface

[0336] 3a, 3b Individual contact surfaces

[0337] 4 Protrusion (of the tool connection device)

[0338] 5 Recess (of the tool connection device)

[0339] 6 Cover part

[0340] 7 Transition part / flange

[0341] 8 Rounding part

[0342] 9 Notch

[0343] 9a Notch in the protrusion area

[0344] 9b Notch in the recess area

[0345] 10 Rotation axis

[0346] 12 (Multiple) consistent areas / (Multiple) first sub - areas of the tool connection device

[0347] 13 (Multiple) difference areas / (Multiple) second sub - areas of the tool connection device

[0348] 14a, b (Connection) surface

[0349] 17 Step

[0350] 18 First end plane / lower end plane

[0351] 19 Second end plane / upper end plane

[0352] 20 (Center) opening

[0353] 21 Working area

[0354] 22 Inner wall

[0355] 23 Outer wall

[0356] 24 (Prominent) coding device (of the tool device)

[0357] 25 (Coding device designed as a notch) of the tool device

[0358] 26 (Prominent) coding device (of the machine tool)

[0359] 27 Encoding device (designed as a notch) of the machine tool

[0360] 28 Plate

[0361] 30 Tool device

[0362] 40 Machine connection device

[0363] 41 Drive shaft

[0364] 42 Contour line / Internal contour of the machine connection device

[0365] 42a Contour wall of the machine tool

[0366] 43 Machine contact surface

[0367] 44 Protrusion of the machine connection device

[0368] 45 Recess of the machine connection device

[0369] 46 Retaining device or hook device

[0370] 47 Normal vector on the machine contact surface

[0371] 48 Upper end face of the machine connection device

[0372] 49 Lower end face of the machine connection device

[0373] 50 Machine tool

[0374] 55 Combination of the machine tool and the tool device

[0375] 60 Workpiece / disc

[0376] 61 Flat area

[0377] 62 - 64 Notch / openings in the workpiece

[0378] 80 - 84 Method steps

[0379] Ew Axial extension of the tool connection device

[0380] Ep Axial extension of the contour line of the tool connection device

[0381] LA Length of the notch (in the circumferential direction)

[0382] LK Length of the contact surface (in the circumferential direction)

[0383] tk Wall thickness in the contact surface area

[0384] td Wall thickness in the cover area

[0385] α coincidence angle

[0386] β difference angle.

Claims

1. A tool device having at least one working area adapted to act on a workpiece, the tool device being designed for use in cooperation with a tool machine, in particular a hand-held tool machine, Among them, the tool machine having a rotationally oscillating drive shaft that moves at least 10 times per second about a machine-fixed axis of rotation in a first direction of rotation and then always reverses the movement and moves in the opposite second direction of rotation, wherein a machine connection device is arranged on the drive shaft and coaxially therewith, the machine connection device having an internal profile that tapers in the direction of the axis of rotation, the internal profile having a contour line surrounding the axis of rotation, the contour line having twelve convex protrusions projecting inwardly towards the axis of rotation and twelve concave recesses, the recesses forming an uninterrupted, substantially continuously extending contour wall that is arranged substantially rotationally symmetrically about the axis of rotation, wherein the tapering is oriented such that the region of the internal profile with the smaller inner diameter is closer to the tool machine, which is referred to as upper, and the region with the larger inner diameter is located at a greater distance from the tool machine, which is referred to as lower, wherein the drive shaft has a holding device for holding the tool device, and wherein the tool device has a tool connection device that can be connected to the machine connection device substantially torsionally rigidly so as to transmit torque and force between the tool machine and the tool device, such that the tool device performs a rotationally oscillating movement coaxially with the drive shaft, wherein the tool connection device has an external profile that has a contour line surrounding the axis of rotation, the contour line having at least one outwardly directed protrusion, wherein the at least one protrusion is designed to engage in a recess of the internal profile of the machine connection device in the state of connection to the tool machine, and wherein the at least one outwardly directed protrusion has at least two contact surfaces, wherein at least one of the contact surfaces is arranged to transmit the rotational movement of the machine connection device in the first direction of rotation to the tool connection device, and wherein at least one second contact surface of the contact surfaces is arranged to transmit the rotational movement of the machine connection device in the second direction of rotation to the tool connection device, wherein the contour line of the tool connection device is designed to be different from the contour line of the machine connection device and is different from the contour line of the machine connection device at least in the following respects: a) The number of protrusions of the tool device is selected from the group consisting of the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, and 11, in particular from the group consisting of the numbers 1, 2, 3, 4, 5, 8, 9, 10, and 11, and / or b) The number of protrusions of the tool device is 13 or more, and / or c) The contour line of the tool connection device differs from the contour line of the machine connection device in at least two, in particular at least three, circumferentially offset regions around the contour line, and / or d) The contour line of the tool connection device is not designed to be tapered but extends parallel to the axis of rotation, and / or e) the contour line of the tool connecting device is inclined relative to the rotation axis, and wherein the contour line of the tool connecting device is inclined in a manner different from the contour line of the machine connecting device, and / or f) the contour line of the tool connecting device has at least two, in particular at least three notches, and / or g) the contour line of the tool connecting device has a notch that accounts for at least 40%, in particular at least 45%, in particular at least 50% of the circumference of the contour line of the tool connecting device, and / or h) the contour line of the tool connecting device has at least one consistent region and at least one different region, wherein the contour line of the tool connecting device is consistent with the contour line of the machine connecting device in the consistent region, wherein the contour line of the tool connecting device is different from the contour line of the machine connecting device in the different region, wherein the at least one consistent region extends through a total consistent angle of up to 225°, in particular up to 220°, 210°, 200°, 190°, 180°, 170°, 160°, 150°, 140°, 130°, 120°, 110°, 100°, 90°, 80°, 70°, 60°, 50°, 40°, 30°, 20° or 10°, and the at least one different region extends through a different angle, wherein the consistent angle + the different angle = 360°, and / or i) the contour line of the tool connecting device does not have the shape of a regular hexagon or heptagon in at least one, in particular a plurality of, in particular all planes perpendicular to the rotation axis.

2. The tool device according to claim 1, wherein, If at least applicable to a), the contour line of the tool connecting device is substantially consistent with the contour line of the machine connecting device in a first sub-region and different from the contour line of the machine connecting device in a second sub-region, wherein the contour line of the tool connecting device extends inside the volume defined by the inner contour of the machine connecting device in the second sub-region.

3. The tool device according to claim 2, wherein, The contour line of the tool connecting device connects two outwardly directed protrusions through a substantially flat surface (14a) or a curved surface (14b) in the second sub-region.

4. The tool device according to claim 1 or 2, wherein, If the tool device has only one outwardly directed protrusion, the contour line of the tool connecting device connects the two contact surfaces of the only protrusion through at least three substantially flat surfaces (14a), or through at least one substantially curved surface (14b), or through at least one substantially flat surface (14a) and at least one substantially curved surface (14b) in the second sub-region.

5. The tool device according to claim 1 or another one of the preceding claims, wherein, When at least applicable to b), the contour line of the tool connecting device is substantially consistent with the contour line of the machine connecting device in a first sub-region and different from the contour line of the machine connecting device in a second sub-region, wherein the contour line of the tool connecting device extends inside the volume defined by the inner contour of the machine connecting device in the second sub-region.

6. The tool device according to claim 5, wherein, The contour line of the tool connecting device has more outwardly directed protrusions in the second sub-region than the concave recesses of the machine connecting device.

7. The tool device according to claim 1 or another one of the foregoing claims, wherein, When applicable at least to c), the regions where the contour line of the tool connecting device is substantially the same as the contour line of the machine connecting device define a plurality of first sub-regions, and wherein the regions where the contour line of the tool connecting device is different from the contour line of the machine connecting device define a plurality of second sub-regions, where the contour line of the tool connecting device extends inside the volume defined by the inner contour of the machine connecting device in the second sub-regions.

8. The tool device according to claim 7, wherein, The contour line of the tool connecting device is in: - exactly one of the second sub-regions, or - at least one of the second sub-regions, or - a plurality of the second sub-regions, or - a plurality but not all of the second sub-regions, or - all of the second sub-regions substantially the same as the contour line of the machine connecting device in a first cross-section perpendicular to the axis of rotation, and different from the contour line of the machine connecting device in a second cross-section perpendicular to the axis of rotation and different from the first cross-section.

9. The tool device according to claim 7, wherein, The contour line of the tool connecting device is in: - exactly one of the second sub-regions, or - at least one of the second sub-regions, or - a plurality of the second sub-regions, or - a plurality but not all of the second sub-regions, or - all of the second sub-regions different from the contour line of the machine connecting device in all cross-sections perpendicular to the axis of rotation.

10. The tool device according to claim 1 or another of the preceding claims, wherein, When applicable at least to d), the contour line of the tool connecting device is substantially the same as the contour line of the machine connecting device in at least one first cross-section perpendicular to the axis of rotation.

11. The tool device according to claim 1 or another one of the preceding claims 1 to 9, wherein, When applicable at least to d), the contour line of the tool connecting device is different from the contour line of the machine connecting device in all cross-sections perpendicular to the axis of rotation.

12. The tool device according to claim 1 or another of the preceding claims, wherein, When applicable at least to e), the extension of the contour line of the tool connecting device is steeper than the extension of the inner contour of the machine connecting device.

13. The tool device according to claim 1 or another one of the foregoing claims, wherein, When applicable at least to f), at least one of the notches is respectively arranged between two adjacent contact surfaces.

14. The tool device according to claim 13, wherein, At least one of the notches is arranged between two adjacent contact surfaces such that the two adjacent contact surfaces do not contact in at least one, in particular a plurality, in particular all cross-sections perpendicular to the axis of rotation.

15. The tool device according to claim 13 or 14, wherein, At least one of the notches has a length LA in the circumferential direction around the contour line of the tool connecting device, and the contact surface adjacent to the notch has a length LK, where the ratio LK:LA is at least 4:3, preferably at least 5:3, preferably at least 2:1, preferably at least 5:2, preferably at least 3:

1.

16. The tool device according to any one of claims 13 to 15, wherein At least one, in particular a plurality, in particular all of the notches are arranged in the circumferential direction around the contour line of the tool connecting device at the angular positions where the protrusions of the tool connecting device are provided.

17. The tool device according to any one of claims 13 to 16, wherein, The contour line of the tool connecting device has at least one radially inwardly directed recess, In particular, at least one recess of the tool connecting device is arranged between two adjacent contact surfaces or formed by two adjacent contact surfaces.

18. The tool device according to claim 17, wherein, At least one, in particular a plurality, in particular all of the notches are arranged in the circumferential direction of the contour line of the tool connecting device at the angular positions provided with the recesses of the tool connecting device. In particular, at least one, in particular a plurality, in particular all of the notches have a greater length in the circumferential direction of the contour line of the tool connecting device at the angular positions of the protrusions of the tool connecting device than at the angular positions of the recesses of the tool connecting device.

19. The tool device according to claim 1 or another one of the foregoing claims, wherein, When at least applicable to g), the notch extends through at least 40%, in particular at least 45%, in particular at least 50% of the circumference of the contour line of the tool connecting device in at least one plane perpendicular to the axis of rotation, or wherein the notch does not extend through at least 50%, in particular at least 45%, in particular at least 40% of the circumference of the contour line of the tool connecting device in any plane perpendicular to the axis of rotation. In particular, the notch extends in planes extending perpendicular to the axis of rotation.

20. The tool device according to claim 1 or another one of the foregoing claims, wherein, When at least applicable to h), the contour line of the tool connecting device is different from the inner contour of the machine connecting device in the at least one difference region for the following reasons: - The contour line of the tool connecting device is radially inwardly shifted relative to the inner contour of the machine connecting device with respect to the axis of rotation, in particular extending with a radius smaller than that of the corresponding region of the inner contour of the machine connecting device; and / or - The contour line of the tool connecting device has a different inclination with respect to the inner contour of the machine connecting device with respect to the axis of rotation, in particular extending parallel to the axis of rotation; and / or - The contour line of the tool connecting device has notches; and / or - The contour line of the tool connecting device has a stepped structure.

21. The tool device according to claim 1 or 20, wherein, When at least applicable to h), - The contour line of the tool connecting device has at least two discrete difference regions, in particular at least three discrete difference regions; and / or - The contour line of the tool connecting device has at least two discrete consistent regions, in particular at least three discrete consistent regions; and / or - The contour line of the tool connecting device is different from the inner contour of the machine connecting device in at least one difference region in all planes extending perpendicular to the axis of rotation, or the contour line of the tool connecting device is consistent with the inner contour of the machine connecting device in at least one difference region in at least one, in particular a plurality, but not all planes extending perpendicular to the axis of rotation.

22. The tool device according to any one of the preceding claims, wherein, At least two contact surfaces, in particular all contact surfaces of the tool connecting device extend between a first end plane and a second end plane, the first end plane and the second end plane being arranged perpendicular to the axis of rotation and spaced apart from each other. Herein, the tool device has a transition portion that connects the tool connection device to the working area and is preferably connected to the tool connection device with respect to the axis of rotation, in particular substantially at the height of the first end plane, and Herein, the tool device has a cover portion that extends from the outer contour of the tool connection device in a direction toward the axis of rotation and is located with respect to the axis of rotation, in particular substantially at the height of the second end plane.

23. A tool device having at least one working area adapted to act on a workpiece, the tool device being designed for use in cooperation with a tool machine, in particular a hand-held tool machine, Among them, The tool machine has a rotatably oscillating drive shaft that moves at least 10 times per second about a machine-fixed axis of rotation in a first rotational direction and then always reverses the movement and moves in an opposite second rotational direction, Herein, a machine connection device is arranged on the drive shaft and coaxially therewith, the machine connection device having an internally tapered contour extending in the direction of the axis of rotation, the internal contour having a contour line surrounding the axis of rotation, the contour line having twelve convex protrusions projecting inwardly toward the axis of rotation and twelve concave recesses, the recesses forming an uninterrupted, substantially continuously extending contour wall, the contour wall being arranged substantially rotationally symmetrically about the axis of rotation, wherein the tapered extension is oriented such that the region of the internal contour with the smaller inner diameter is closer to the tool machine, which is referred to as up, and the region with the larger inner diameter is located at a greater distance from the tool machine, which is referred to as down, Herein, the drive shaft has a holding device for holding the tool device, and Herein, the tool device has a tool connection device that can be connected to the machine connection device substantially torsionally rigidly so as to transmit torque and force between the tool machine and the tool device, such that the tool device performs a rotatably oscillating movement coaxially with the drive shaft, Herein, the tool connection device has an outer contour having a contour line surrounding the axis of rotation, the contour line having at least one outwardly directed protrusion, Herein, the at least one protrusion is designed to engage in a recess of the internal contour of the machine connection device in a state of connection to the tool machine, and Herein, the at least one outwardly directed protrusion has at least two contact surfaces, Herein, at least one of the contact surfaces is arranged to transmit the rotational movement of the machine connection device in the first rotational direction to the tool connection device, and Herein, at least one second contact surface of the contact surfaces is arranged to transmit the rotational movement of the machine connection device in the second rotational direction to the tool connection device, Herein, at least two contact surfaces of the tool connection device, in particular all contact surfaces, extend between a first end plane and a second end plane, the first end plane and the second end plane being arranged perpendicular to the axis of rotation and spaced apart from each other, Herein, the tool device has a transition portion that connects the tool connection device to the working area and is preferably connected to the tool connection device with respect to the rotation axis, particularly substantially at the height of the first end plane. Herein, the tool device has a cover portion that extends from the outer contour of the tool connection device in a direction toward the rotation axis and is particularly substantially located at the height of the second end plane with respect to the rotation axis. Herein, the tool device substantially has a wall thickness tk in the area of the contact surface and substantially has a wall thickness td in the area of the cover portion, where the wall thickness tk in the area of the contact surface is greater than the wall thickness td in the area of the cover portion.

24. The tool device according to claim 23, wherein, The wall thickness tk in the area of the contact surface: - is measured in a direction perpendicular to the respective contact surface, or - is measured in a direction corresponding to the direction in which the perpendicular to the respective contact surface is projected onto a plane extending perpendicular to the rotation axis and preferably - is defined as the average value of all wall thicknesses in the area of the contact surface, or - is defined as the maximum value of all wall thicknesses in the area of the contact surface, or - is defined as the minimum value of all wall thicknesses in the area of the contact surface.

25. The tool device according to claim 23 or 24, wherein, The wall thickness td in the area of the cover portion is measured in a direction parallel to the rotation axis, and preferably - is defined as the average value of all wall thicknesses in the area of the cover portion, or - is defined as the maximum value of all wall thicknesses in the area of the cover portion, or - is defined as the minimum value of all wall thicknesses in the area of the cover portion, or - is defined as the wall thickness at the radially innermost point of the cover portion.

26. The tool device according to any one of claims 23 to 25, wherein, The wall thickness tk in the area of the contact surface is at least 10% or 20% or 30% greater than the wall thickness td in the area of the cover portion.

27. The tool device according to any one of claims 23 to 26, wherein, The wall thickness td in the area of the cover portion is between 1 mm and 1.5 mm.

28. The tool device according to any one of claims 22 to 27, wherein The cover portion has at least one opening, particularly a central opening.

29. The tool device according to any one of the preceding claims, wherein, The contour line of the tool connection device has a stepped structure, and in particular, where the stepped structure has multiple steps, and in particular, where the contact surfaces of different steps of the tool connection device have different inclinations with respect to the rotation axis, and / or the contour line of the tool connection device has different cross-sections in a plane perpendicular to the rotation axis, particularly in the case of a contact surface extending parallel to the rotation axis.

30. A combination of a machine tool and a tool device, having: The tool device and the machine tool according to any one of the preceding claims, Among them, The machine tool has a rotationally oscillating drive shaft that moves around a machine-fixed rotation axis at least 10 times per second in a first rotation direction and then always reverses the movement and moves in an opposite second rotation direction, and A machine connecting device is arranged on the drive shaft and coaxially therewith, the machine connecting device having an inner profile that tapers in the direction of the axis of rotation, the inner profile having a contour line surrounding the axis of rotation, the contour line having twelve convex protrusions protruding inwardly towards the axis of rotation and twelve concave recesses, the recesses forming an uninterrupted, substantially continuously extending contour wall that is arranged substantially rotationally symmetrically about the axis of rotation. The drive shaft has a holding device for holding the tool device.

31. A method for manufacturing a tool device according to any one of claims 1 to 29, wherein the method: For manufacturing the contour line of the tool connecting device, includes shaping, deforming or generative method steps or a combination of a plurality of the following method steps selected from: forging, stamping, rolling, extrusion, folding, deep drawing, hemming, straightening, bending, stretching, upsetting, sintering, casting, layer-by-layer deposition; and / or For manufacturing a notch or an opening, includes a separating method step, preferably a thermal separation or a mechanical separation method step, or a combination of a plurality of the following method steps selected from: sawing, grinding, milling, stamping, shearing, particle beam cutting, electron beam cutting, laser beam cutting, plasma cutting, flame cutting, spark erosion cutting.

32. The method according to claim 31, wherein The method includes the following steps: A) Providing a workpiece, wherein the workpiece has a substantially flat area; B) Manufacturing at least one notch or opening in the substantially flat area of the workpiece; C) Machining the substantially flat area of the workpiece to manufacture the contour line of the tool connecting device, wherein step C) is carried out after steps A) and B).

33. The method according to claim 32, wherein the notch or opening manufactured in step B) forms a notch or opening in the contour line of the tool connecting device, particularly between two adjacent contact surfaces, particularly in the area of the outwardly pointing protrusions and / or the inwardly recessed depressions of the contour line of the tool connecting device.

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