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

Abstract

A tool device for use with a hand-held oscillation machine tool has at least one working region which is suitable for acting on a workpiece. The machine tool has a drive shaft with a machine connector device with an inner profile which widens conically in the direction of the rotational axis and has a profile contour which runs around the rotational axis with twelve convex projections which protrude inwards towards the rotational axis and twelve concave depressions which form an uninterrupted, continuously running profile wall, which are arranged rotationally symmetrically about the rotational axis. The conical widening is oriented in such a way that smaller internal diameters of the inner profile are situated closer to the machine tool and larger internal diameters are situated at a greater spacing from the machine tool. The tool device has a tool connector device which can be connected fixedly to the machine connector device for conjoint rotation, in order to transmit torques and forces between the machine tool and a tool device, with the result that the tool device carries out a rotational / oscillating movement coaxially with respect to the drive shaft. The tool connector device has an outer profile with a profile contour which runs around the rotational axis with at least one outwardly pointing projection for engaging into the depressions of the inner profile of the machine connector device. This projection has at least two contact surfaces. The profile contour of the tool connector device differs from the profile contour of the machine connector device by way of: the number of projections; interruptions or recesses in the profile contour of the tool connector device; the course of the profile contour of the tool connector device which does not run conically, but rather parallel to the rotational axis, or at a different inclination than the profile contour of the machine connector device.

Description

[0001] Tool setup, machine tool and tool setup combination and manufacturing process

[0002] Description

[0003] The entire content of the priority application, DE 20 2022 106 179.3 (utility model), is hereby incorporated into the present application by reference.

[0004] The present invention relates to a tool device with at least one working area suitable for acting on a workpiece, which is intended for use with a particularly hand-held machine tool with a rotary-oscillating drive shaft.

[0005] For the sake of simplicity, the term "tool" will be used instead of "tool fixture" in the following, but this is not to be understood as a limitation. Furthermore, the term "oscillating" will be used instead of "rotary-oscillating," but in the context of this description, the term has the same meaning.

[0006] A rotary-oscillating machine tool, hereinafter also referred to as an oscillating machine or oscillator, is, in the context of the present invention, a device with a rotary-oscillating drive device having a drive shaft, in which the drive device moves from a central position in a first direction of rotation, is braked to a standstill, and then moves in the opposite direction of rotation until it stops. The rotary-oscillating movement of the tool makes it possible—unlike machines with continuous rotary motion such as drills, circular saws, grinders, etc.—to use tools with a non-rotationally symmetrical design. This results in a multitude of possible tools that can be operated with a rotary-oscillating machine tool, such as plunge-cut saw blades, segment saw blades, triangular or segment-shaped grinding tools, and the like.Rotary oscillating machine tools are therefore also called multitools. The oscillating motion of the drive mechanism of the rotary oscillating machine tool is typically generated by a drive motor whose output shaft is offset by 90° from the (fictitious) longitudinal axis of the drive shaft and usually rotates in one direction at an adjustable speed. An eccentric is mounted on the output shaft of this motor, which drives the drive mechanism of the rotary oscillating machine tool via a fork. The (fictitious) axis around which the tool mechanism oscillates is referred to below as the oscillation axis or, for short, the rotation axis.

[0007] The angular distance of the oscillation movement from the center position to the respective end position can typically be up to 5°, although smaller angles of 1° to 2.5° are common in engineered machines, which corresponds to a total oscillation angle (1st - 2nd end position) of 2° to 5°. This oscillation movement is typically performed between 5,000 and 50,000 times per minute.

[0008] The reversal of the direction of rotation causes the machining forces of the tool, which, as is well known, always act against the direction of movement or, in this case, against the direction of rotation, to also change their direction. The changing direction of the machining forces results in a torque corresponding to the lever arm, i.e. the distance of the machining point of the tool from the axis of rotation, which reverses its direction with the oscillation. The torque resulting from the machining forces is superimposed by another torque which is effective both during machining and when the machine is idling, namely the torque resulting from the moment of inertia of the tool and the oscillating parts of the machine tool to decelerate the tool after it has reached its highest speed (e.g.the respective amplitude maximum of the sine curve with a sinusoidal change in the rotational speed of the drive device) and the renewed acceleration of the tool in the opposite direction after the reversal of the direction of rotation.

[0009] The torques resulting from the machining forces and the kinematic conditions of the oscillation drive are essentially generated by the machine tool and introduced into the tool device via the drive device.

[0010] Due to the oscillating movement, the area of ​​the tool in which the torque is introduced is subject to alternating bending stress. This is particularly problematic with metallic materials, from which the tools in question are usually made. Metals have a crystalline structure. If local overloads occur in one area of ​​a metallic component, i.e. the stresses acting in the component at this point are higher than the stresses the component can withstand, microcracks form between the individual grains of the metal structure. These impair the strength of the component in two ways. Firstly, in the area where microcracks have formed, no stresses can be transferred within the component. This means that the crack formation increases the loads within this area because the effective surface for force transmission is reduced.

[0011] Second, a phenomenon commonly referred to in mechanical engineering as "notch effect" occurs. This term derives from the fact that in the area of ​​a notch, especially if the notch has sharp edges, a local stress concentration develops, which leads to stresses in the material surrounding the notch that are higher than the stresses in the areas of the component not affected by such a geometry.

[0012] These increased loads cause cracking to progress and ultimately lead to failure of the component.

[0013] This process, which is documented, for example, in the work of Palmgren and Miner, is called damage accumulation.

[0014] The ability of a material or component to withstand oscillating loads, particularly alternating bending loads, is typically represented by the component's so-called Wöhler curve. The Wöhler curve is based on the finding that alternating loading—in the Wöhler test, this is referred to as a load cycle—can often be sustained permanently, particularly by a steel component, if the component can withstand between 2 million and 6 million (depending on the material) of such load cycles without damage. In mechanical engineering, this is referred to as the fatigue strength of the material or component.

[0015] As described above, an oscillating tool oscillates, for example, at a frequency of 20,000 oscillations / min. In the context of fatigue-resistant component design, this translates to 40,000 load cycles / min or 2.4 million load cycles / h.

[0016] The lower fatigue strength limit of the Wöhler test of 2 million load cycles is therefore exceeded after just one hour of tool operation.

[0017] The high number of load cycles places particular strain on the interface between the tool and the machine tool. The magnitude of the load depends largely on the design of the interface and the machining forces applied to the workpiece by the tool. In general, a distinction can be made between inertia forces and machining forces.

[0018] The inertia forces that load the interface arise from the rotational oscillation, i.e., the deceleration of the tool and the acceleration in the opposite direction of rotation. They also occur during idle operation, when the tool assembly is not in contact with a workpiece. The inertia forces depend on the tool's moment of inertia about its oscillation axis, the rotational speed, and the overall oscillation angle. The moment of inertia itself depends on how the tool weight is arranged around the oscillation axis. In general, heavy tools have a greater moment of inertia about the oscillation axis than lighter tools.

[0019] The machining forces depend on the type of machining, the material properties of the workpiece being machined, the normal force with which the tool is pressed against the workpiece, and the performance data of the oscillating machine.

[0020] When designing the tool setup, the designer must resolve a conflicting objective: if high machining forces are to be applied at higher or higher speeds, a stable tool with a stable interface must be used. However, this results in the tool becoming heavier overall, which increases the inertial forces. With higher machining forces and higher speeds, the load on the interface increases significantly.

[0021] If, on the other hand, a light tool with a lower moment of inertia is used, the inertial forces acting on the interface are reduced, but at the same time, high machining forces cannot be applied with light tools.

[0022] The applicants of the present invention presented a solution to this conflict of objectives with the market launch of the STARLOCK® interface in 2016, which is described, among other things, in WO 2015 / 014467 A1 and WO 2015 / 014468 A1. While plunge-cut saw blades, segment saw tools, scrapers, and the like were previously typically punched from a flat steel sheet with a wall thickness of 1 to 2 mm, the Starlock interface is three-dimensional, with contact surfaces of the machine's tool holder and the tool's connection device inclined to the oscillation axis. This has several advantages: the three-dimensional design increases the contact area between the machine's tool holder and the tool's connection device, reducing the surface pressure for the same load.The forces are transferred to the tool holder's connection device via a form-fitting connection via a specially designed profile with a total of twelve rounded projections that project radially outwards and enable even force introduction into the tool. This profile is provided on the one hand in the tool holder of the oscillation machine and on the other hand as an essentially complementary profile, also featuring twelve projections, in the tool holder's connection device. The inclination of the contact surfaces means that the tool's connection device can be pressed into the oscillation machine's tool holder in the direction of the oscillation axis so that the connection device is received by the tool holder without any play. This prevents the occurrence of relative play between the tool holder and the tool device.The disadvantages of a positive connection between the tool holder of an oscillating machine and the tool device known in the prior art, in particular the heating and wear of the interface of the tool device caused by relative play, can thus be avoided without losing the advantages of positive connections in terms of power transmission and the precise alignment of the tool with respect to the longitudinal axis of the oscillating machine (the longitudinal axis of the oscillating machine is generally aligned at an angle of 90° to the rotary oscillating drive shaft of the oscillating machine, as explained above). This precise alignment is essential, for example, when working with a plunge-cut saw blade or a triangular grinding device.

[0023] The Starlock interface, as its inventors envisioned, has made it possible to use oscillating tools with significantly higher power than was previously possible. To prevent lighter, lower-power machines from being overloaded by heavy tools, a classification into three classes has been implemented, and the tool connection system has been designed accordingly so that only lighter tools can be used on lower-power machines.

[0024] However, as the inventors of the present invention have discovered, there is a need on the market for tools which, on the one hand, can be accommodated by a machine with a Starlock profile, but whose connection device is, on the other hand, simpler in design and / or has a reduced moment of inertia.

[0025] The present invention therefore aims to provide an alternative, Starlock-compatible profile for the tool's connection device. This object is achieved according to the invention by a tool device according to the corresponding independent claims. Further independent claims protect a machine tool and tool device combination as well as a manufacturing method. Preferred embodiments of the invention are the subject of the dependent claims.

[0026] In the following description and in the claims, the terms "top" and "bottom" are used to mean "closer to the machine tool" and "bottom" to mean "farther from the machine tool." The terms "top" and "bottom" correspond to the working position of a hand-held machine tool when used, for example, to perform grinding work on a horizontal surface located below the hands of the machine tool operator or to perform sawing work on a vertical structure where the saw is also located below the hands of the operator. However, the machine tool can also be used in other orientations.For example, if the machine tool is used in an orientation in which a horizontal surface to be ground is located above the hands of the machine tool operator, a component located ‘above’ according to the present definition is actually located below a component located ‘below’ according to the present definition.

[0027] A first aspect of the present disclosure relates to a tool device having at least one working area suitable for acting on a workpiece, which is intended for use with a particularly hand-held machine tool, wherein the machine tool has a rotary-oscillating drive shaft which moves at least 10 times per second in a first direction of rotation about a machine-fixed axis of rotation and then reverses the movement and moves in a second, opposite direction of rotation, wherein on this drive shaft and coaxially thereto a machine connection device is arranged with an inner profile which widens conically in the direction of the axis of rotation and which has a profile contour surrounding the axis of rotation with a number of twelve convex projections projecting inwards towards the axis of rotation and twelve concave depressions which form an uninterrupted, essentially continuously extending profile wall,which are arranged substantially rotationally symmetrically around the axis of rotation, wherein this conical widening is oriented such that the region of the inner profile with the smaller inner diameter is located closer to the machine tool, which is referred to as the top, and the region with the larger inner diameter is located at a greater distance from the machine tool, which is referred to as the bottom, wherein this drive shaft has a holding device for holding the tool device, and wherein the tool device has a tool connection device which is connectable substantially rotationally fixed to this machine connection device in order to transmit torques and forces between the machine tool and the tool device, so that the tool device executes a rotationally oscillating movement coaxially to this drive shaft,wherein the tool connection device has an outer profile with a profile contour running around the axis of rotation with at least one outwardly facing projection, wherein this at least one projection is designed to engage in these recesses of the inner profile of the machine connection device when connected to the machine tool, and wherein the at least one outwardly facing projection has at least two contact surfaces, wherein at least one of these contact surfaces is provided for transmitting the rotational movement of the machine connection device to the tool connection device in the first direction of rotation, and wherein at least a second of these contact surfaces is provided for transmitting the rotational movement of the machine connection device to the tool connection device in the second direction of rotation,wherein the profile contour of the tool connection device is designed differently from the profile contour of the machine connection device and differs from the profile contour of the machine connection device at least in that a) the number of projections of the tool device is taken from a group consisting of the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11, in particular a group consisting of the numbers 1, 2, 3, 4, 5, 8, 9, 10 and 11, and / or b) the number of projections of the tool device is 13 or more, and / or c) the profile contour of the tool connection device deviates from the profile contour of the machine connection device in at least two, in particular at least three, areas offset by the circumference of the profile contour and / or d) the profile contour of the tool connection device is not conical,but runs parallel to the axis of rotation and / or e) the profile contour of the tool connection device is inclined relative to the axis of rotation and wherein the profile contour of the tool connection device is inclined differently than the profile contour of the machine connection device and / or f) the profile contour of the tool connection device has a number of at least two, in particular at least three, recesses and / or g) the profile contour of the tool connection device has a recess which represents at least 40%, in particular at least 45%, in particular at least 50% of the circumference of the profile contour of the tool connection device and / or h) the profile contour of the tool connection device has at least one area of ​​agreement in which the profile contour of the tool connection device matches the profile contour of the machine connection device, and has at least one area of ​​deviation,in which the profile contour of the tool connection device deviates from the profile contour of the machine connection device, wherein the at least one matching area extends in total over a matching angle of at most 225°, in particular at most 220°, 210°, 200°, 190°, 180°, 170°, 160°, 150°, 140°, 130°, 120°, 110°, 100°, 90°, 80°, 70°, 60°, 50°, 40°, 30°, 20° or 10°, measured in the circumferential direction around the axis of rotation, and the at least one deviation area extends in total over a deviation angle, wherein the matching angle + deviation angle = 360° and / or i) the profile contour of the tool connection device in at least one, in particular several, in particular all, planes perpendicular to The axis of rotation does not have the shape of a regular hexagon or heptagon.

[0028] Because the profile contour of the tool connection device is designed differently from the profile contour of the machine connection device defined according to the first aspect, at least according to some embodiments, the mass of the tool device and / or its (rotational) moment of inertia (hereinafter also referred to simply as the moment of inertia) can be reduced. Furthermore, at least according to some embodiments, material savings can be achieved in the manufacture of the tool device, and the tool device can optionally also be used with machine tools that have a different machine connection device than the machine connection device defined according to the first aspect. Furthermore, at least according to some embodiments, the torque that can be transmitted from the machine tool to the tool device orcan be absorbed by the tool device, in particular without damaging it.

[0029] At least according to some embodiments, the term "protrusion" in connection with the profile contour of the tool connection device is to be understood such that the profile contour of the tool connection device is concave in at least one cross-section perpendicular to the axis of rotation in at least one region (of the outer circumference). According to this definition, for example, a regular triangle, quadrilateral, pentagon, etc., or even a rectangle, does not have a "protrusion" because there is no concave region between the corners of these polygons (seen from the outside). In contrast, according to this definition, a quadrilateral with a corner whose interior angle is greater than 180° has two protrusions, namely at the corners adjacent to this corner.

[0030] Furthermore, the term "protrusion" in connection with the profile contour of the tool connection device is preferably understood to mean that the profile contour of the tool connection device is concave in at least one cross-section perpendicular to the axis of rotation in at least two regions (of the outer circumference). According to this definition, the aforementioned quadrilateral with an interior angle greater than 180° would therefore have no protrusion. In contrast, according to this definition, for example, a square with an additional triangle formed on one edge (resulting in a 7-gon with two interior angles greater than 180°) would have exactly one protrusion, namely at the remaining, outward-facing vertex of the triangle between these two interior angles.

[0031] The term "profile contour of the tool connection device" refers here to the outer profile of the tool connection device. The tool connection device can also have an inner profile (facing the rotation axis) with an (inner) profile contour that can (essentially) correspond to the profile contour of the outer profile of the tool connection device or can (significantly) deviate from it. "Profile contour of the machine connection device" refers here to the inner profile of the machine connection device.

[0032] The term "profile contour of the tool connection device," as used herein, does not necessarily refer to the entire axial extent of the tool connection device, although this is also possible. In particular, the profile contour of the tool connection device can extend between two axial positions in such a way that one or both of these axial positions do not coincide with the corresponding axial end positions of the tool connection device. For example, the tool connection device can have, in particular production-related, rounded portions at one or both of its axial end positions (or in the vicinity thereof), wherein the profile contour of the tool connection device extends over an axial region or lies in such an axial region that adjoins this rounded portion(s) or lies between these rounded portions.In particular, this axial region can be (essentially) concentric between the axial end positions of the tool connection device and the rounded portions, or non-concentric—for example, if one of the rounded portions extends over a larger axial area than the rounded portion located at the other axial end. The profile contour of the tool connection device can, for example, extend over an axial area that corresponds to at most 90%, at most 80%, at most 70%, at most 60%, or at most 50% of the axial extent of the tool connection device.

[0033] The same can apply to the profile contour of the machine connection device with regard to the axial extension of the machine connection device.

[0034] The axial extent of the tool connection device can be (at least in some angular ranges relative to the rotation axis) equal to the axial extent of the machine connection device, or greater or smaller than this. Similarly, the axial extent of the profile contour of the tool connection device can be equal to the axial extent of the profile contour of the machine connection device, or greater or smaller than this.

[0035] A plane perpendicular to the axis of rotation is also referred to herein as a radial plane. In relation to the machine tool, such a radial plane is therefore a plane perpendicular to the axis of rotation of this machine tool. In relation to the tooling, such a radial plane is a plane perpendicular to the axis of rotation of the tooling, around which the tooling moves in a rotationally oscillating manner when the tooling is connected coaxially to the axis of rotation of the machine tool and driven by it, as intended.

[0036] As can be seen not least from features d) and e), the inclination of the profile contour of the tool connection device to a radial plane can be 90° or a value other than 90°. With an inclination of 90° to such a radial plane, the profile contour of the tool connection device is not inclined to the axis of rotation or the inclination of the profile contour of the tool connection device to the axis of rotation is 0°. With an inclination other than 90° to a radial plane, the inclination of the profile contour of the tool connection device to the axis of rotation is other than 0°. A tangential plane at a point on the profile contour of the tool connection device inclined in this way intersects the axis of rotation at exactly one point.

[0037] Furthermore, if the inclination to a radial plane is different than 90°, the inclination can be greater or less than 90°. In this case, an inclination of less than 90° is defined as an inclination at which the profile contour of the tool connection device (or an axial section thereof) opens (further) downwards. Accordingly, in this case, an inclination of more than 90° is defined as an inclination at which the profile contour of the tool connection device (or an axial section thereof) narrows downwards.

[0038] Furthermore, feature e) in particular makes it clear that the inclination of the profile contour of the tool connection device (or of an axial section thereof) may deviate from the inclination of the profile contour of the machine connection device (or of an axial section thereof).

[0039] In the context of the present invention, the term "recess" can be understood as a through hole (or a through bore) or as a non-through hole (or a blind hole recess), or both, unless explicitly stated otherwise and / or arising from the context. The term "bore" or "through bore" used here should not be understood to mean that such a bore or through bore must necessarily be created by drilling. Instead, such a bore or through bore can also be created by other process steps, in particular by primary forming, forming, or generative process steps. A bore or through bore does not necessarily have to have a round cross-section, but can, in principle, take on any cross-sectional shape.

[0040] Viewed in a radial plane, the twelve convex projections projecting inward toward the rotational axis and the twelve concave recesses of the machine connection device can together form a star with twelve points, in particular a regular star, i.e., with twelve points evenly distributed around the circumference with an angular spacing of 30°. The interior angles of this 12-pointed star can be, for example, 120° at the points and 210° at the points midway between two adjacent points.

[0041] The transitions between two adjacent sides of this 12-pointed star can be rounded, in particular to facilitate production. Again viewed in a radial plane, the radius of curvature of such transitions can, for example, be in a range between 5 mm and 1.5 mm. The radius of curvature can be smaller at the upper axial end of the machine connection device than at the lower axial end of the machine connection device. Preferably, this radius of curvature is greater than 2 mm, in particular greater than 214 mm, and preferably greater than 2.5 mm, in particular in a radial plane located centrally between the two axial ends of the machine connection device. Further preferably, this radius of curvature is less than 4.5 mm, in particular less than 4 mm, and preferably less than 3.5 mm, in particular in the centrally arranged radial plane.Further preferably, this radius of curvature, particularly in the centrally located radial plane, is approximately 3 mm ± 14 mm. These radii of curvature achieve high strength, while also simplifying production, for example, when using a deep-drawing process.

[0042] Similarly, the profile contour of the tool connection device can have rounded portions, in particular at transitions between two adjacent contact surfaces. Viewed in a radial plane, the radius of curvature of such transitions can, for example, lie in the ranges previously mentioned for the machine connection device, wherein the radius of curvature for the tool connection device can be substantially equal to the radius of curvature for the machine connection device or can deviate from it, in particular can be greater than it. The radius of curvature of such rounded portions can be the same (i.e. constant) at all points of the rounding or different (i.e. variable). If, for example, it is described here that two adjacent contact surfaces of the tool connection device (viewed in a radial plane) enclose a certain angle, for example an interior angle of 120° or210°, this does not necessarily mean that these two contact surfaces meet (in the geometrically exact sense) at exactly one point or at exactly one line / edge, but rather that there can be a rounding in between as described above.

[0043] The term ‘recess’ referred to in feature g) is to be understood in particular as a single recess, that is to say as a continuous recess (in particular a structurally closed recess which is separated from any other recesses which may be present) – sometimes also referred to as a discrete recess – and not as the sum of several individual (discrete) recesses.

[0044] Furthermore, the term "circumference of the profile contour" mentioned in feature g) refers in particular to the circumference that the profile contour of the tool connection device would have if it were also continued in the region of the recess, in particular if it were continued (possibly regularly) as in regions where the profile contour of the tool connection device has no recess or only significantly smaller recesses. Where appropriate, the term "circumference of the profile contour" (of the tool connection device provided with at least one recess) can also be understood to mean the circumference of the inner profile of the machine connection device, in particular at the level (in the axial direction) of the recess of the tool connection device.

[0045] With regard to feature i), the profile contour of the tool connection device can therefore, for example, have the shape of an irregular hexagon in at least one, in particular several, in particular all, planes perpendicular to the axis of rotation - or have neither a hexagon nor a heptagon.

[0046] Several embodiments of the tool device are described below, which can each be combined with each other as well as with the other described aspects of the invention and their embodiments, unless this is expressly excluded or is not technically expedient.

[0047] In embodiments where at least a) applies, reducing the number of projections may also result in a reduction in the moment of inertia, the mass and / or the material consumption of the tool device.

[0048] According to some embodiments, if at least a) applies, the profile contour of the tool connection device substantially coincides with the profile contour of the machine connection device over a first partial area and deviates from the profile contour of the machine connection device over a second partial area, wherein the profile contour of the tool connection device in the second partial area runs within a volume which is defined by the inner profile of the machine connection device.

[0049] Or in other words: Over the first sub-area, the profile contour of the tool connection device, in a cross-section perpendicular to the rotation axis, essentially represents part of a star-shaped polygon, wherein the star-shaped polygon has twelve outwardly projecting projections and twelve inwardly concave depressions. In contrast, the profile contour of the tool connection device in the second sub-area of ​​the tool connection device, in the same cross-section perpendicular to the rotation axis, extends within this star-shaped polygon (or within the volume defined by the respective star-shaped polygons in the various radial planes of the tool connection device).

[0050] Because the profile contour of the tool connection device runs within this volume in the second partial area, the moment of inertia of the tool device is reduced because in the second partial area the inner profile runs closer to the axis of rotation than would be the case if the inner profile also followed the star-shaped polygon in the second partial area.

[0051] Regarding the term "within the volume defined by the internal profile of the machine connection device," the following should be noted: The section of the tool connection device that is to be inserted into the machine connection device runs within the volume of the machine connection device anyway. When the tool device is used as intended with a corresponding machine tool, contact occurs between the tool connection device and the machine connection device in at least several areas, namely point, line, or surface contact. This means that areas of the outer profile of the tool device touch the inner profile of the machine connection device at points or in certain areas.In this case, however, "within the volume" means that the relevant area of ​​the outer profile of the tool fixture runs at a distance from the inner profile of the machine connection fixture, i.e., at a smaller radius relative to the axis of rotation. This distance is, in particular, a distance that is greater than a microscopically small distance, for example, a distance that is at least 0.1 mm, at least in some areas.

[0052] According to some embodiments, the profile contour of the tool connection device in the second partial region connects two outwardly facing projections by a substantially flat surface or a curved surface.

[0053] Such a flat or curved surface can also reduce the moment of inertia of the tool device - not only because the profile contour of the tool connection device, as described above, runs closer to the axis of rotation, but also because such a curved and especially such a flat surface can represent a more direct connection or "shortcut", the course of which can be shorter than a course along the star-shaped polygon. With the same wall thickness and the same starting material, a shorter course also results in a lower weight of the tool device. This can also potentially result in material savings. On the other hand, a profile contour with outward-facing projections and inward-facing recesses is particularly advantageous with regard to mechanical stability, i.e. the fatigue strength and / or rigidity of the tool connection device.The term "structural strength" refers to the tool's ability to withstand the loads encountered over its projected service life, and "rigidity" refers to the tool's resistance to deformation, particularly elastic deformation, caused by an occurring force or moment. A design in which the profile contour of the tool connection device in the second sub-area connects two outward-facing projections by a substantially flat surface or a curved surface is therefore particularly suitable for applications where only reduced loads are expected, for example, when machining a workpiece for which, due to the material, only low machining forces are required.

[0054] In order to achieve the advantages of a reduced torque and still achieve a relatively high strength, ie load-bearing capacity of the tool device, the profile contour can also have outwardly directed projections and inwardly directed depressions in the second partial area, but on a smaller radius than in the first partial area.

[0055] According to some embodiments in which the tool device has only a single outward-facing projection, the profile contour of the tool connection device in the second partial region can connect the two contact surfaces of this single projection by at least three substantially flat surfaces, or by at least one substantially curved surface, or by at least one substantially flat surface and at least one substantially curved surface. Such embodiments are also particularly suitable for applications in which only a reduced load is to be expected.

[0056] In embodiments where at least b) applies, the mechanical stability or load-bearing capacity of the tool device can be increased by the at least one additional projection.

[0057] According to some embodiments, if at least b) applies, the profile contour of the tool connection device essentially coincides with the profile contour of the machine connection device over a first partial area and deviates from the profile contour of the machine connection device over a second partial area, wherein the profile contour of the tool connection device in the second partial area extends within a volume defined by the inner profile of the machine connection device. In this way, both increased mechanical stability or load-bearing capacity and a reduction in the moment of inertia and / or material consumption can be achieved.

[0058] In these embodiments, the profile contour of the tool connection device in the second partial area can have more outward-facing projections than the machine connection device has concave depressions.

[0059] In designs where at least c) applies, a reduction in the moment of inertia, mass, and / or material consumption may also be achieved. Because the profile contour of the tool connection device deviates from the profile contour of the machine connection device in at least two, in particular at least three, regions offset by the circumference of the profile contour, a more uniform weight distribution in the region of the tool connection device may also be achieved than would be the case if the profile contour of the tool connection device deviated from the profile contour of the machine connection device in only one region of its circumference.

[0060] According to some embodiments, if at least c) applies, the regions in which the profile contour of the tool connection device substantially coincides with the profile contour of the machine connection device define a plurality of first subregions, and the regions in which the profile contour of the tool connection device deviates from the profile contour of the machine connection device define a plurality of second subregions, wherein the profile contour of the tool connection device in the second subregions extends within a volume defined by the inner profile of the machine connection device. This may in turn result in a reduction in the moment of inertia, the mass, and / or the material consumption.

[0061] According to some embodiments, the profile contour of the tool connection device in: exactly one of the second sub-regions or at least one of the second sub-regions or several of the second sub-regions or several, but not all, of the second sub-regions or all second sub-regions in a first cross-section perpendicular to the axis of rotation substantially corresponds to the profile contour of the machine connection device and deviates from the profile contour of the machine connection device in a second cross-section different from the first cross-section perpendicular to the axis of rotation.

[0062] Or in other words: in the first cross-section, the profile contour of the tool connection device also follows or corresponds to the profile contour of the machine connection device in one, several or all of the second partial areas and thus has one or more outward-facing projections and possibly concave depressions in this / these partial areas - corresponding to the twelve convex projections projecting inwards towards the axis of rotation and twelve concave depressions of the inner profile of the machine connection device. In contrast, the profile contour of the tool connection device in the second, different cross-section does not follow or correspond to the profile contour of the machine connection device. For example, the profile contour of the tool connection device may not be conical in design, at least in one or more of the second partial areas, but rather run parallel to the axis of rotation.

[0063] The deviation of the profile contour of the tool connection device from the profile contour of the machine connection device can thus affect individual areas of the circumference as a whole (i.e., across the entire axial extent of the tool connection device), or only individual axial areas of this entire axial extent. For example, the profile contour of the tool connection device can first be conical in a second partial area (in particular, following the profile contour of the machine connection device) and then parallel to the rotation axis.

[0064] Feature c) therefore allows designs in which, in some angular ranges (relative to the axis of rotation), the profile contour of the tool connection device follows the inner profile of the machine connection device over several or all cross sections and not in other angular ranges.

[0065] Feature c) also allows designs in which the profile contour of the tool connection device is essentially conical in some or even all angular ranges, but with a different opening angle than the machine connection device, e.g., with a smaller opening angle. In this case, the opening angle is considered to be twice the angle between the axis of rotation and a tangential plane at a point on the profile contour of the tool connection device or the machine connection device.The opening angle of the profile contour of the tool connection device can also differ from the opening angle of the profile contour of the machine connection device in that the cross-section of the tool connection device is smaller in a plane further away from the machine tool (perpendicular to the rotational axis) – i.e., a plane located further down – than in a plane closer to the machine tool (perpendicular to the rotational axis) – i.e., a plane located further up. The opening angle of the profile contour of the tool connection device can then be smaller or larger than the opening angle of the profile contour of the machine connection device, or the same size.

[0066] According to some embodiments, the profile contour of the tool connection device deviates from the profile contour of the machine connection device in exactly one of the second partial regions or at least one of the second partial regions or several of the second partial regions or several, but not all, of the second partial regions or all second partial regions in all cross sections perpendicular to the axis of rotation.

[0067] Feature c) therefore allows, among other things, designs in which the profile contour in one or more sub-areas in all cross-sections perpendicular to the axis of rotation corresponds to the profile contour of the machine connection device and in one or more further sub-areas in some, but not all, cross-sections perpendicular to the axis of rotation corresponds to the profile contour of the machine connection device and in one or more further sub-areas in all cross-sections perpendicular to the axis of rotation deviates from the profile contour of the machine connection device.

[0068] In embodiments in which at least d) applies, the profile contour of the tool connection device can in turn run within the volume defined by the inner profile of the machine connection device. In this way, a reduction in the moment of inertia, the mass and / or the material consumption of the tool device can optionally be achieved. According to some embodiments, if at least d) applies, the profile contour of the tool connection device essentially coincides with the profile contour of the machine connection device in at least a first cross-section perpendicular to the axis of rotation. This can be the case, for example, at the upper axial end of the tool connection device. In other (second) cross-sections perpendicular to the axis of rotation, the profile contour of the tool connection device deviates from the profile contour of the machine connection device due to its course parallel to the axis of rotation.However, embodiments are also conceivable in which the cross-section perpendicular to the axis of rotation, in which the profile contour of the tool connection device essentially corresponds to the profile contour of the machine connection device, is not located at the upper axial end of the tool connection device, but for example at an axial position between the upper and lower ends of the tool connection device.

[0069] According to some embodiments, if at least d) applies, the profile contour of the tool connection device deviates from the profile contour of the machine connection device in all cross sections perpendicular to the axis of rotation.

[0070] The deviation in all cross-sections perpendicular to the rotation axis could, for example, manifest itself in such a way that the cross-section(s) of the profile contour of the tool connection device matches(es) the cross-section(s) of the machine connection device over one or more angular ranges and deviates(es) from it in one or more other angular ranges, particularly within the cross-section of the machine connection device. In addition, the profile contour of the tool connection device runs parallel to the rotation axis in these designs.

[0071] In embodiments where at least e) applies, the profile contour of the tool connection device can in turn run within the volume defined by the inner profile of the machine connection device. A rotationally fixed connection between the tool connection device and the machine connection device can nevertheless be achieved if, at least in a cross-section perpendicular to the axis of rotation, the profile contour of the tool connection device corresponds to or follows the profile contour of the machine connection device at least over a (sufficiently large) angular range and / or the tool connection device can contact the machine connection device at several points (distributed around the circumference). According to some embodiments, if at least e) applies, the profile contour of the tool connection device is steeper than the profile of the inner profile of the machine connection device.

[0072] In particular, a different, in particular steeper, inclination of the profile contour of the tool connection device compared to the machine connection device can manifest itself, for example, in such a way that the smallest angle enclosed between one or more (tangential planes on one or more) contact surface(s) of the tool connection device and the rotation axis is smaller than the smallest angle enclosed between one or more (tangential planes on one or more) inner profile surface(s) or machine contact surfaces of the inner profile of the machine connection device and the rotation axis.

[0073] Like feature c), feature e) also allows designs in which the profile contour of the tool connection device is essentially conical, but with a different opening angle than the machine connection device, e.g. with a smaller opening angle. The opening angle of the profile contour of the tool connection device can also deviate from the opening angle of the profile contour of the machine connection device in that the cross-section of the tool connection device in a plane further away from the machine tool (perpendicular to the axis of rotation) - i.e. a plane further down - is smaller than in a plane closer to the machine tool (perpendicular to the axis of rotation) - i.e. a plane further up. The opening angle of the profile contour of the tool connection device can then be smaller or larger than the opening angle of the profile contour of the machine connection device, or the same size.

[0074] In embodiments where at least f) applies, the at least two recesses can be designed, for example, as through-holes or as depressions, particularly those directed radially inward. This, in turn, can achieve a reduction in the moment of inertia, mass, and / or material consumption of the tool device.

[0075] According to some embodiments, if at least f) applies, at least one of the recesses is arranged between two adjacent contact surfaces.

[0076] This can potentially simplify the manufacture of the tool device, but can also contribute to an improvement in the torque transmission capacity, as explained below. According to some embodiments, at least one of the recesses is arranged between two adjacent contact surfaces such that the two adjacent contact surfaces do not touch in at least one, in particular several, in particular all, cross-sections perpendicular to the axis of rotation. In the latter case, the at least one recess therefore extends over the entire axial extent of one or both opposite edges of the contact surfaces. In contrast, the two adjacent contact surfaces touch in at least one, in particular several, cross-sections perpendicular to the axis of rotation if the at least one of the recesses does not extend over the entire axial extent of one or both opposite edges of the contact surfaces.

[0077] According to some embodiments, the at least one of the recesses has a length LA in the circumferential direction of the circumferential profile contour of the tool connection device and a contact surface adjacent to this recess has a length LK, wherein 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.

[0078] A larger LK:LA ratio can improve mechanical stability, i.e., the strength and / or rigidity of the tool assembly, and thus also its torque load capacity. A smaller LK:LA ratio, on the other hand, can achieve a greater reduction in the moment of inertia, mass, and / or material consumption.

[0079] According to some embodiments, at least one, in particular several, in particular all, of the recesses are arranged in the circumferential direction of the circumferential profile contour of the tool connection device at angular positions at which a projection of the tool connection device is provided. At these angular positions, the effect of the recesses in reducing the moment of inertia can be particularly great.

[0080] According to some embodiments, the profile contour of the tool connection device has at least one radially inward-facing recess. The at least one recess of the tool connection device can be arranged, in particular, between two adjacent contact surfaces or formed by two adjacent contact surfaces.

[0081] According to some embodiments, at least one, in particular several, in particular all, of the recesses are arranged in the circumferential direction of the profile contour of the tool connection device at angular positions at which a recess of the tool connection device is provided.

[0082] At least one, in particular several, in particular all, of the recesses at an angular position of a projection of the tool connection device can have a greater length in the circumferential direction of the profile contour of the tool connection device than at least one, in particular several, in particular all, of the recesses at an angular position of a recess in the tool connection device. This can be advantageous from a manufacturing perspective. Furthermore, a recess at an angular position of a projection of the tool connection device makes a greater contribution to reducing the moment of inertia than an (otherwise similar) recess at an angular position of a recess in the tool connection device.

[0083] Alternatively, at least one, in particular several, in particular all, of the recesses at an angular position of a projection of the tool connection device (with respect to their length in the circumferential direction of the profile contour) can be substantially as large as at least one, in particular several, in particular all, of the recesses at an angular position of a recess of the tool connection device, or even smaller. To ensure this, manufacturing-related circumstances can be taken into account within the scope of the invention, as explained below.

[0084] In designs where at least g) applies, the relatively large recess contributes particularly to a reduction in the moment of inertia and, where appropriate, also in the mass and material consumption of the tool device.

[0085] According to some embodiments, if at least g) applies, the recess extends in at least one plane perpendicular to the axis of rotation over at least 40%, in particular at least 45%, in particular at least 50% of the circumference of the profile contour of the tool connection device. Alternatively, this recess does not extend in any plane perpendicular to the axis of rotation over at least 50%, in particular at least 45%, in particular at least 40% of the circumference of the profile contour of the tool connection device, if such a plane is considered in isolation. In particular, in this case the recess can extend over different planes running perpendicular to the axis of rotation.

[0086] The course of the recess in the circumferential direction may, for example, have one or more kinks, waves or a zigzag structure, etc. Similar to feature g), in designs where at least h) applies, a relatively small range of conformity (and thus a relatively large range of deviation) contributes significantly to a reduction in the moment of inertia and, where appropriate, also in the mass and material consumption.

[0087] According to some embodiments, if at least h) applies, the profile contour of the tool connection device deviates in the at least one deviation region from the inner profile of the machine connection device in that the profile contour of the tool connection device is set back radially inwards with respect to the inner profile of the machine connection device towards the axis of rotation, in particular runs on a smaller radius or smaller radii than a corresponding region of the inner profile of the machine connection device and / or the profile contour of the tool connection device has a different inclination with respect to the axis of rotation with respect to the inner profile of the machine connection device, in particular runs parallel to the axis of rotation and / or the profile contour of the tool connection device has a recess and / or the profile contour of the tool connection device has a stepped structure.

[0088] The term "stepped structure" is to be understood in particular to mean that the profile contour of the tool connection device does not run essentially uniformly from one axial end of the contact surfaces to another axial end of the contact surfaces, but has at least one step in between. The term "step" is understood here, when the connection device is viewed in a cross-section running through the axis of rotation, to mean a significant change in the angle in a direction towards the axis of rotation, which is followed by a corresponding counter-change in the angle of inclination. To explain this using an example: a first, in particular lower, region of the contact surface encloses an angle of 70° with a plane perpendicular to the axis of rotation, while another, in particular upper, region of the contact surface encloses an angle of 50° with a plane perpendicular to the axis of rotation.

[0089] Such a stepped structure can also have one or more sections in which the tool connection device runs (essentially) perpendicular to the rotation axis. A tool connection device with a stepped structure does not necessarily have to be stepped around the entire circumference, but can be stepped in some sections of the circumference and non-stepped in others. Likewise, the tool connection device can have a first stepped structure in one or more sections of the circumference and a second stepped structure, different from the first stepped structure, in one or more other sections of the circumference.

[0090] According to some embodiments, if at least h) applies, the profile contour of the tool connection device can have at least two discrete deviation regions, in particular at least three discrete deviation regions, and / or the profile contour of the tool connection device can have at least two discrete match regions, in particular at least three discrete match regions, and / or the profile contour of the tool connection device can deviate from the inner profile of the machine connection device in at least one deviation region in all planes running perpendicular to the axis of rotation, or the profile contour of the tool connection device can match the inner profile of the machine connection device in at least one deviation region in at least one, in particular in several, but not all, planes running perpendicular to the axis of rotation.

[0091] The tool connection device may also have (significantly) more than three conformity areas and / or deviation areas, for example (at least) six, in particular (at least) twelve, in particular (at least) 24.

[0092] In all the embodiments described above, the at least two contact surfaces, in particular all contact surfaces, of the tool connection device can extend between a first and a second end plane, which are arranged perpendicular to the axis of rotation and are spaced apart from one another, wherein the tool device can have a transition section which connects the tool connection device to the work area and which preferably adjoins the tool connection device, in particular substantially at the level of the first end plane with respect to the axis of rotation, and wherein the tool device can have a cover section which extends from the outer profile of the tool connection device in the direction of the axis of rotation and which is located, in particular substantially at the level of the second end plane with respect to the axis of rotation.In particular, the first end plane may be located at or near the lower axial end of the tool connection device and the second end plane may be located at or near the upper axial end of the tool connection device.

[0093] A second aspect of the present disclosure relates to a tool device having at least one working area suitable for acting on a workpiece, which is intended for use with a particularly hand-held machine tool, wherein the machine tool has a rotary-oscillating drive shaft which moves at least 10 times per second in a first direction of rotation about a machine-fixed axis of rotation and then reverses the movement and moves in a second, opposite direction of rotation, wherein on this drive shaft and coaxially thereto a machine connection device is arranged with an inner profile which widens conically in the direction of the axis of rotation and which has a profile contour surrounding the axis of rotation with a number of twelve convex projections projecting inwards towards the axis of rotation and twelve concave depressions which form an uninterrupted, essentially continuously extending profile wall,which are arranged substantially rotationally symmetrically around the axis of rotation, wherein this drive shaft has a holding device for holding the tool device, and wherein the tool device has a tool connection device which can be connected substantially rotationally fixedly to this machine connection device in order to transmit torques and forces between the machine tool and the tool device, so that the tool device carries out a rotationally oscillating movement coaxially to this drive shaft, wherein the tool connection device has an outer profile with a profile contour running around the axis of rotation with at least one outwardly facing projection, wherein this at least one projection is designed towhen connected to the machine tool, to engage in these recesses of the inner profile of the machine connection device, and wherein the at least one outwardly facing projection has at least two contact surfaces, wherein at least one of these contact surfaces is provided to transmit the rotational movement of the machine connection device to the tool connection device in the first direction of rotation, and wherein at least a second of these contact surfaces is provided to transmit the rotational movement of the machine connection device to the tool connection device in the second direction of rotation, wherein the at least two contact surfaces, in particular all contact surfaces, of the tool connection device extend between a first and a second end plane, which are arranged perpendicular to the axis of rotation and are spaced apart from one another, wherein the tool device has a transition section,which connects the tool connection device to the working area and which preferably adjoins the tool connection device, in particular substantially at the level of the first end plane with respect to the axis of rotation, wherein the tool device has a cover section which extends from the outer profile of the tool connection device in the direction of the axis of rotation and which, in particular substantially at the level of the second end plane with respect to the axis of rotation, wherein the tool device has a wall thickness tk in the region of the contact surfaces and a wall thickness td in the region of the cover section, wherein the wall thickness tk in the region of the contact surfaces is greater than the wall thickness td in the region of the cover section.

[0094] According to the second aspect of the invention, the tool device can be manufactured with a smaller wall thickness td in the area of ​​the cover section than the wall thickness tk in the area of ​​the contact surfaces. This also allows a reduction in the moment of inertia, mass, and / or material consumption of the tool device to be achieved.

[0095] According to some embodiments, the wall thickness tk in the region of the contact surfaces is measured: in a direction perpendicular to the corresponding contact surface, or in a direction corresponding to a projection of a perpendicular to the corresponding contact surface onto a plane perpendicular to the rotation axis. If the contact surfaces are not parallel to the rotation axis, these measurements result in a (possibly slightly) different wall thickness.

[0096] Preferably, the wall thickness tk in the region of the contact surfaces is defined as: the mean value of all wall thicknesses in the region of the contact surfaces, or the maximum value of all wall thicknesses in the region of the contact surfaces, or the minimum value of all wall thicknesses in the region of the contact surfaces. These embodiments take into account, in particular, that the wall thickness in the region of the contact surfaces is not necessarily constant across all areas of the contact surfaces. An average value of all wall thicknesses in the region of the contact surfaces can, for example, be defined as a median or determined as a weighted average, for example by integrating the wall thicknesses across all contact surfaces and dividing the result of this integration by the total area of ​​the contact surfaces.

[0097] According to some embodiments, the wall thickness td in the region of the lid section is measured in a direction parallel to the axis of rotation and is preferably defined as the mean value of all wall thicknesses in the region of the lid section or as the maximum value of all wall thicknesses in the region of the lid section or as the minimum value of all wall thicknesses in the region of the lid section or as the wall thickness at the radially innermost point of the lid section.

[0098] This takes into account that the wall thickness in the area of ​​the lid section is not necessarily constant across all areas of the lid section.

[0099] According to some embodiments, the wall thickness tk in the region of the contact surfaces is at least 10%, 20%, or 30% greater than the wall thickness td in the region of the cover section. Or, expressed conversely, the wall thickness td in the region of the cover section is at least 10%, 20%, or 30% smaller than the wall thickness tk in the region of the contact surfaces.

[0100] This in turn can lead to a reduction in the moment of inertia, mass and / or material consumption of the tool device.

[0101] According to some embodiments, the wall thickness td in the area of ​​the lid section is between 1 mm and 1.5 mm. However, other dimensions are also possible.

[0102] According to some embodiments, the lid section has at least one, in particular central, opening.

[0103] The hook devices disclosed in WO 2015 / 014468 A1, for example, can reach through this opening in the cover section in order to hold the tool device on a machine tool as described in this document. The cover section can have further recesses or coding devices (or in English "keying devices"), such as areas raised in the axial direction (i.e. pointing upwards away from the first end plane), or depressions (i.e. areas in the cover section whose surface is closer to the first (lower) end plane than is the case with surrounding areas of the cover section) or through holes. Such coding devices can serve to ensure that certain tool devices can only be used with certain machine tools, for example by certain machine tools having complementarily shaped coding devices in the machine connection device.On the other hand, such coding devices can also ensure compatibility with certain machine tools.

[0104] According to some embodiments, the profile contour of the tool connection device has a stepped structure. The stepped structure can, in particular, have multiple steps. The contact surfaces for different steps of the tool connection device can have a different inclination with respect to the axis of rotation. Additionally or alternatively, the profile contour of the tool connection device can have different cross-sections, particularly in the case of contact surfaces running parallel to the axis of rotation, in a plane perpendicular to the axis of rotation.

[0105] A third aspect of the present disclosure relates to a machine tool and tool device combination, comprising: a tool device as described above and a machine tool, wherein the machine tool has a rotary-oscillating drive shaft which moves at least 10 times per second in a first direction of rotation about a machine-fixed axis of rotation and then reverses the movement and moves in a second, opposite direction of rotation, and wherein on this drive shaft and coaxially thereto a machine connection device is arranged with an inner profile which widens conically in the direction of the axis of rotation and which has a profile contour surrounding the axis of rotation with a number of twelve convex projections projecting inwards towards the axis of rotation and twelve concave depressions which form an uninterrupted, substantially continuously extending profile wall,which are arranged substantially rotationally symmetrically about the axis of rotation, wherein this drive shaft has a holding device for holding the tool device.,

[0106] A fourth aspect of the present disclosure relates to a method for producing a tool device as described above, wherein the method for producing the profile contour of the tool connection device comprises a primary forming, forming, or generative process step or a combination of several such process steps, which are selected from a group consisting of forging, indentation, rolling, extrusion, folding, deep drawing, beading, flanging, straightening, bending, stretching, upsetting, sintering, casting, layer-by-layer application, and / or for producing a recess or opening comprises a separating process step, preferably a thermally separating or a mechanically separating process step or a combination of several such process steps, which are selected from a group consisting of sawing, grinding, milling, punching, shearing, particle beam cutting, electron beam cutting,Laser cutting, plasma cutting, flame cutting, spark erosion cutting.

[0107] In particular, the tool device, or at least its external shape, can be produced completely or predominantly by means of a generative manufacturing process.

[0108] According to some embodiments, the method comprises the following steps:

[0109] A) providing a workpiece, the workpiece having a substantially planar region;

[0110] B) forming at least one recess or opening in the substantially planar region of the workpiece;

[0111] C) Machining the substantially flat area of ​​the workpiece to produce the profile contour of the tool connection device, wherein step C) is carried out after steps A) and B).

[0112] In this process, at least one recess or opening is created before the profile contour of the tool connection device is created from the initially essentially flat area of ​​the workpiece. This can simplify the manufacturing process.

[0113] According to some embodiments, the recess or opening produced in step B) forms a recess or opening in the profile contour of the tool connection device, in particular between two adjacent contact surfaces, in particular in the region of an outwardly facing projection and / or an inwardly concave depression of the profile contour of the tool connection device.

[0114] In step B), it can be provided that recesses or openings are formed both in the area of ​​an outwardly facing projection and in the area of ​​an inwardly concave depression in the profile contour of the tool connection device. These can, for example, initially be of the same size. However, the machining in step C) can result in a recess or opening in the area of ​​an outwardly facing projection ultimately being larger (in the circumferential direction) than a recess or opening in the area of ​​an inwardly facing concave depression in the profile contour of the tool connection device.

[0115] Alternatively, the recesses or openings in step B) can initially be created with different sizes (in the circumferential direction). For example, a recess or opening provided in the finished tool device in the region of an outward-facing projection can initially be made smaller than a recess or opening provided in the finished tool device in the region of an inward-facing concave depression in the profile contour of the tool connection device. By machining the essentially flat region of the workpiece in step C), the size of the recesses or openings can change, in particular change differently, for example in such a way that the recesses or openings initially created with different sizes (in the circumferential direction), in particular at the projections orRecesses in the profile contour of the tool connection device essentially have the same size (in the circumferential direction).

[0116] Steps A), B), and C) can be performed in the specified order. Instead of performing steps A), B), and C) sequentially, methods are also conceivable in which steps A) and B) are performed essentially simultaneously, for example, with the aid of a suitable mold in which not only the (initially flat) outer contour of the tool device or the tool device as a whole is formed, but also the recesses or openings. In this variant, however, step C) is also performed after steps A) and B).

[0117] The following figures show various features and embodiments of the invention and are partly schematic, although a combination of individual features and embodiments beyond the figures is also possible.

[0118] It shows:

[0119] Fig. 1 is an exemplary perspective view of a machine connection device according to the prior art. Fig. 2 is a perspective view of a tool connection device according to an embodiment of the present invention.

[0120] Fig. 3 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0121] Fig. 4 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0122] Fig. 5 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0123] Fig. 6 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0124] Fig. 7 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0125] Fig. 8 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0126] Fig. 9 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0127] Fig. 10 shows a cross-section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the rotation axis according to an embodiment of the present invention. Fig. 11 shows a cross-section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the rotation axis according to an embodiment of the present invention.

[0128] Fig. 12 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0129] Fig. 13 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0130] Fig. 14 shows a cross section of an inner profile of a machine connection device and an outer profile of a tool connection device in a plane perpendicular to the axis of rotation according to an embodiment of the present invention.

[0131] Fig. 15 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0132] Fig. 16 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0133] Fig. 17 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0134] Fig. 18 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0135] Fig. 19 shows a cross-section of a machine connection device and a tool connection device in a plane parallel to the rotation axis according to an embodiment of the present invention. Fig. 20 shows a cross-section of a machine connection device and a tool connection device in a plane parallel to the rotation axis according to an embodiment of the present invention.

[0136] Fig. 21 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0137] Fig. 22 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0138] Fig. 23 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0139] Fig. 24 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0140] Fig. 25 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0141] Fig. 26 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0142] Fig. 27 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0143] Fig. 28 shows a cross-section of a machine connection device and a tool connection device in a plane parallel to the rotation axis according to an embodiment of the present invention, partially also a side view. Fig. 29 shows a cross-section of a machine connection device and a tool connection device in a plane parallel to the rotation axis according to an embodiment of the present invention, partially also a side view.

[0144] Fig. 30 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0145] Fig. 31 shows a cross section of a machine connection device and a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention, partly also a side view.

[0146] Fig. 32 shows in cross section a detailed view of a profile wall of a tool connection device in a plane parallel to the axis of rotation according to an embodiment of the present invention.

[0147] Fig. 33 is a plan view of a workpiece for producing a tool connection device according to an embodiment of the present invention.

[0148] Fig. 34 is a plan view of a tool connection device made from the workpiece of Fig. 33 according to an embodiment of the present invention.

[0149] Fig. 35 is a plan view of a tool device according to an embodiment of the present invention.

[0150] Fig. 36 is a side view of a machine tool and tooling combination according to an embodiment of the present invention.

[0151] Fig. 37 shows a process flow of a method for producing a tool connection device according to an embodiment of the present invention.

[0152] Fig. 1 shows an exemplary perspective view of a machine connection device 40 according to the prior art. Fig. 1 is taken from WO 2015 / 014468 A1. The machine connection device 40 is fastened to the lower end of a drive shaft 41 of a machine tool 50 (Fig. 36) or forms an integral component with the drive shaft 41. When used as intended, the drive shaft 41 and thus also the machine connection device 40 performs oscillating movements about the axis of rotation 10, wherein the axis of rotation 10 coincides with the longitudinal axis of the drive shaft 41. The machine connection device 40 is delimited at its (axially) lower end by a lower end surface 49. An upper end surface 48 of the machine connection device is located at an axial distance from the lower end surface 49.Axially between the upper and lower end surfaces 48, 49, the machine connection device 40 has a profile wall 42a that has an annular basic shape, with the radially outer side being cylindrical in the example shown. Within the annular machine connection device 40 is a cavity or recess with a volume defined by the machine connection device 40.

[0153] The essentially annular profile wall 42a forms a closed ring, i.e. it is not interrupted, although variants are also conceivable in which the profile wall 42a has one or more interruptions, i.e. it does not encircle 360°.

[0154] On the inside, the annular profile wall 42a has an inner profile with a profile contour 42 that runs around the rotation axis 10. This profile contour 42 extends essentially between the lower end surface 49 and the upper end surface 48. The inner profile or profile contour 42 widens conically in the direction of the rotation axis 10, such that the area with the smaller inner diameter is located closer to the machine tool (or closer to the upper end surface 48) and the area with the larger inner diameter is located at a greater distance from the machine tool (or closer to the lower end surface 49).

[0155] However, cross-sections of the profile contour 42 in planes perpendicular to the axis of rotation 10 (i.e., in radial planes) do not have a circular inner diameter - at least for the most part or at most axial positions - but rather resemble a star-shaped polygon with twelve convex projections 44 projecting inwards towards the axis of rotation 10 and twelve concave recesses 45. Between each two adjacent projections 44 or between each two recesses 45, the inner profile 42 has two machine contact surfaces 43, wherein in the example shown, rounded transitions (without reference symbols) are located between each two adjacent machine contact surfaces 43, i.e., at the angular positions of the projections 44 and the recesses 45. In the circumferential direction, the course of the inner profile 42 with the machine contact surfaces 43 and the rounded transitions in between could also be described as wave-shaped.Due to the conically widening profile contour 42, the machine contact surfaces 43 enclose an angle other than 90° with a radial plane. They are therefore inclined with respect to the axis of rotation 10. Furthermore, due to the arrangement of the machine contact surfaces 43 according to a star-shaped polygon, the following applies: The machine contact surfaces 43 are intersected by an infinitely large number of axial planes (i.e., planes that enclose the axis of rotation 10). Without loss of generality, we now consider a specific axial plane (not shown in the figures). The intersection of this specific axial plane with a corresponding machine contact surface 43 forms a line. Again without loss of generality, we now consider a specific point on this line, marked "X" in Fig. 1. To this point X, we form the normal vector 47, which points away from the profile wall 42a.This normal vector 47 does not run in the axial plane underlying our analysis, but rather forms a non-zero angle with this axial plane. Overall, the normal vector 47 is therefore inclined both with this axial plane and with a radial plane.

[0156] Finally, the machine connection device 40 also has two holding devices or hook devices 46, which are pivotally mounted about an axis perpendicular to the rotational axis 10. This pivot axis is located in the area of ​​or slightly above the upper end surface 48. When the holding devices 46 (or their lower ends) are pivoted inward toward the rotational axis 10, a STARLOCK® tool device can be attached to or removed from the machine connection device 40. When the holding devices 46 (or their lower ends) are pivoted outward away from the rotational axis 10, a STARLOCK® tool device can be held on the machine connection device 40 by the interaction of the holding devices 46 and the profile wall 42a. The machine tool 50 and the tool device 30 (Fig. 36) then form a machine tool and tool device combination 55 and can be used as intended for sawing, grinding, scraping, etc.

[0157] WO 2015 / 014468 A1 and WO 2015 / 014469 A1 contain further details regarding possible embodiments of the machine tool 50 and the holding devices 46. These publications are expressly incorporated herein by reference. It should be noted that holding devices are also possible that have only a hook device 46, or another type of fastening, for example a screw, as is also described, for example, in WO 2015 / 014468 A1. Reference has already been made to Fig. 36, which shows a machine tool and tool device combination 55. In addition to the details described above, Fig. 36 shows that the tool device 30 has a working area 21. In the example shown, this is located at one end of the tool device 30, which is opposite the end of the tool device 30 with which it is fastened to the machine tool 50.Alternative embodiments are also possible in which the tool device 30 has several separate working areas 21.

[0158] Between the working area 21 and the tool connection device, which will be described in more detail below and with which the tool device 30 can be attached to the machine tool 50, the tool device 30 has a transition section 7. The rotary-oscillating movement is transmitted to the working area 21 through this transition section 7. The transition section 7 can also be regarded as a flange or have one, as described in more detail below. This flange 7 can also extend in the opposite direction with respect to the working area 21 beyond the tool connection device, as indicated in Fig. 36 at the right end of the tool device 30.

[0159] Fig. 2 shows a perspective view of a tool connection device 1 according to an embodiment of the present invention. The tool connection device 1 is essentially constructed in two axially spaced planes, namely a first or lower end plane 18 and a second or upper end plane 19, with a profile wall 2a arranged between or extending between these axially spaced planes 18, 19.

[0160] The tool connection device 1 has a flange 7 or transition section 7 in the region of the lower end plane 18. The outer circumference of this flange 7 is (circular) round in Fig. 2, although the flange 7 can also assume other shapes on its outer circumference in other embodiments.

[0161] The flange 7, as shown in Fig. 2, has twelve recesses 9 evenly distributed in the circumferential direction. As indicated in Fig. 2 by a dashed circle in the area of ​​the flange 7, these recesses 9 lie on a (fictitious) circle arranged concentrically with respect to the outer circumference of the flange 7. In other embodiments, a different number of such recesses 9 and a different arrangement thereof are also possible. The recesses in the flange 7 can serve to fasten the flange 7 to a plate 28 (Fig. 35), for example by screwing, riveting, welding, etc.

[0162] For some types of fastening between flange 7 and plate 28, no recesses 9 are necessary in the flange 7, so that these recesses 9 can also be omitted.

[0163] The plate 28, the flange 7, and / or the tool connection device 1 can be made of hardened sheet steel, for example, although other sufficiently stable materials are also conceivable. As shown in Fig. 35, the plate 28, together with the tool connection device 1 and the flange 7, forms the tool device 30. The working area 21 is located at the right end of the plate 28 in Fig. 35.

[0164] As shown in Fig. 36, the plate 28 may be substantially flat (with a flat top surface and a flat bottom surface parallel and spaced therefrom), although this is not mandatory. For example, the plate 28 may be angled at one or more locations.

[0165] While Fig. 2 shows the tool connection device 1 (together with the flange 7 arranged thereon) as an independent component, which, according to Fig. 35, can be connected to a plate 28 that is initially separate from it, the tool connection device 1, the flange 7, and the plate 28 can also be formed as an integral component (i.e., in one piece). In particular, the entire tool device 30 can be provided in one piece. In this case, too, the recesses 9 in the flange 7 can be omitted.

[0166] As can be further seen from Fig. 2, the flange 7 is not designed as a continuous, closed disc, but rather has a (central) recess (without reference symbol) in the form of a star-shaped polygon with twelve (radially) outward-facing projections and twelve (radially) inward-facing depressions. Above this central recess, Fig. 2 shows a raised area that forms the tool connection device 1. The tool connection device 1 has a cover section 6 at its upper end (in the region of the upper end plane 19). The cover section 6 also forms a star-shaped polygon on its outer circumference with twelve outward-facing projections and twelve inward-facing depressions, wherein the star-shaped polygon formed by the cover section 6 is smaller than the star-shaped recess in the flange 7. A central opening 20 is located in the center of the cover section 6.In intended use, for example, the hook devices 46 shown in Fig. 1 can reach through the central opening 20 or one or more other holding devices of a 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.

[0167] When the tool connection device 1 or the tool device 30 is fastened as intended to a machine connection device 40 of a machine tool 50, the axis of rotation 10 runs not only centrally through the drive shaft 41 of the machine tool 50, but also centrally through the opening 20 of the tool connection device 1. The axis of rotation 10 is perpendicular to the cover section 6. During operation of the machine tool 50, the oscillating movements of the drive shaft 41 of the machine tool 50 are transmitted to the tool connection device 1 or the tool device 30 in a manner to be described below, so that the tool device 30 also executes oscillating movements about the axis of rotation 10. For this reason, the term "axis of rotation 10" is also used accordingly in connection with the tool connection device 1 or the tool device 30, as is the term "axial".

[0168] The central opening 20 in the lid section 6 can, for example, have a round, particularly circular, shape, although other shapes are also possible. In the embodiment shown in Fig. 2, the central opening 20 has a round basic shape, onto which eight outwardly facing bulges or arms are formed. Furthermore, the lid section 6, as shown in Fig. 2, can have further recesses in addition to the central opening 20, which are explained in more detail below.

[0169] A profile wall 2a of the tool connection device 1 is arranged in the area between the flange 7 and the cover section 6 or extends therein. The profile wall 2a defines 24 contact surfaces 3, which also follow the star-shaped opening in the flange 7 or the star-shaped edge of the cover section 6. The transitions between the cover section 6 and the contact surfaces 3 or between the contact surfaces 3 and the flange 7 can have rounded portions 8.

[0170] The outward-facing contact surfaces 3 of the tool connection device 1 are intended to enable (positive-locking) contact with the inward-facing machine contact surfaces 43, preferably at least partial 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. An outward-facing normal vector on a point on the contact surface 3 thus encloses an angle other than zero with a radial plane. Furthermore, such a normal vector lies on a straight line that does not intersect the axis of rotation 10. This straight line thus also encloses an angle other than zero with an axial plane on which this point lies.

[0171] Thus, if such a (positive) contact exists 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 or holding devices 46, the tool device 30 is (at least substantially) connected in a rotationally fixed manner to the drive shaft 41 of the machine tool 50.

[0172] In the embodiment according to Fig. 2 and also in all other embodiments described here, the contact surfaces 3 can be (essentially) flat or curved in one or more directions. The term “curved in one direction” refers to a surface that is curved in one direction only at every point on the surface, e.g. a cylindrical surface. The term “curved in several directions” refers to a surface that is curved in several directions at at least one point on the surface, e.g. a spherical surface. Mixed forms are also conceivable, so that a contact surface 3 can, for example, be flat in one area, curved in one direction in another area and curved in several directions in another area.

[0173] Due to the star-shaped arrangement of the contact surfaces 3, two adjacent contact surfaces 3 each form a (radially) outward-pointing projection 4 or a (radially) inwardly recessed recess 5. However, in the embodiment according to Fig. 2, adjacent contact surfaces 3 do not touch each other. Between each two adjacent contact surfaces 3 (in the circumferential direction of the profile wall 2a) there is a recess 9a or 9b which separates the corresponding adjacent contact surfaces 3 from one another. In the embodiment according to Fig. 2, the recesses 9a in the region of a projection 4 have a greater length (in the circumferential direction of the profile wall 2a) than the recesses 9b in the region of a recess 5. According to other embodiments, it is also possible for the recesses 9a and 9b, for example, to all have the same length in the circumferential direction of the profile wall 2a.

[0174] Due to the recesses 9a and 9b, the moment of inertia of the tool device 30 is reduced compared to a tool device that does not have these recesses and is otherwise manufactured in the same way. A further advantage is explained below in connection with Figures 33 and 34. Several exemplary embodiments will now be described with reference to Figures 3 to 14, which can be regarded as variants of the tool connection device 1 in Figure 2. Most of Figures 3 to 14 each show only a section in a radial plane in the region of the contact surfaces 3, i.e. at an axial position located between the rounded portions 8 at the transition to the cover section 6 or the flange 7. In other radial planes, the tool connection devices 1 can have corresponding or similar sections, but - due to the conical design of the profile wall 2a - with a correspondingly larger or smaller diameter.

[0175] The sections shown in Figures 3 to 14 are simplified for the sake of clarity.

[0176] For better orientation, the sectional view of Fig. 3 shows the machine connection device 40 or its profile wall 42a in a cross section perpendicular to the axis of rotation between the outer circle shown in dashed lines, which indicates the cylindrical outer surface of the machine connection device 40, for example, and the outer star-shaped polygon of Fig. 3. The inner side of this outer star-shaped polygon represents the profile contour or the inner profile 42 of the machine connection device 40, on which machine contact surfaces 43 are arranged.

[0177] Fig. 3 also shows the tool connection device 1 or its profile wall 2a between the two inner star-shaped polygons in a cross-section perpendicular to the rotation axis. The outer side of the outer of these two inner star-shaped polygons (solid line) represents the profile contour or outer profile 2 of the tool connection device. The innermost star-shaped polygon, shown in dashed lines, indicates the inner side of the profile wall 2a.

[0178] In this example, the profile contour 2 of the tool connection device 1 has 24 contact surfaces 3 as well as twelve outwardly facing projections 4 and twelve inwardly recessed recesses 5. The profile contour 42 of the machine connection device 40 has twelve corresponding inwardly facing projections 44 and twelve outwardly recessed recesses 45.

[0179] The star-shaped polygons represented by solid lines, i.e., profile contour 2 of the tool connection device 1 and profile contour 42 of the machine connection device 40, are shown at a certain distance from each other in Fig. 3. This distance serves only to clarify the illustration. During intended use, the two profile I contours 2, 42 touch at numerous points or in numerous surface areas, depending on the manufacturing tolerances, resulting in a positive connection between the tool connection device 1 and the machine connection device 40.

[0180] In Fig. 3 - unlike in Fig. 2 - no recesses 9a, 9b are shown between adjacent contact surfaces 3. These can nevertheless be present, in particular in a radial plane different from the radial plane shown in the section. In other words, according to this exemplary embodiment, the profile contour 2 (i.e. the outer profile of the tool connection device 1) corresponds at least substantially to the profile contour 42 (i.e. the inner profile of the machine connection device 40) in at least the radial plane shown and optionally also in other radial planes. In one or possibly more (not shown) radial planes, however, the profile contour 2 deviates from the profile contour 42.

[0181] Figures 4 to 14 show further variants of the tool connection device 1 of Figures 2 and 3, respectively. The representation essentially follows that of Figure 3, whereby, in the interest of a compact, clear representation, features already described are not described again and, where appropriate, are not provided with corresponding reference numerals. Furthermore, in Figures 4 to 14, the representation of the outer side of the profile wall 42a of the machine connection device 40 (circle shown in dashed lines in Figure 3) and the inner side of the profile wall 2a of the tool connection device 1 (polygon shown in dashed lines in Figure 3) has been omitted.

[0182] In contrast to the embodiment in Fig. 3, the embodiment in Fig. 4 has a deviation region 13. In this region, the profile contour 2 of the tool connection device 1 does not follow or correspond to the profile contour 42 of the machine connection device 40. While the profile contour 42 of the machine connection device 40 has (only) one outwardly recessed recess 45 formed by two machine contact surfaces 43 in this deviation region 13, the profile contour 2 of the tool connection device 1 has in this deviation region 13 two outward-facing projections 4 formed by a total of four contact surfaces 3 and an inwardly recessed recess 5 located therebetween. The profile contour 2 thus deviates from the profile contour 42 in this deviation region 13 - in this region it runs radially inwardly recessed at a distance from the profile contour 42, i.e. within the volume defined by the profile contour 42.In the exemplary embodiment shown, the profile contour 2 thus has a total of thirteen projections 4 and thirteen depressions 5. The variant shown in Fig. 5 has a larger deviation range 13 or three separate deviation ranges 13. While in this / these deviation range(s) 13 the profile contour 42 has three outwardly recessed recesses 45 formed by a total of six machine contact surfaces 43, the profile contour 2 in this / these deviation range(s) 13 has six outward-facing projections 4 formed by a total of twelve contact surfaces 3 with corresponding recesses 5 formed between them. The profile contour 2 here again runs radially inwardly recessed at a distance from the profile contour 42, i.e. within the volume defined by the profile contour 42.

[0183] In other variants not shown, the deviation range 13 can be larger or smaller, or there can be more or fewer deviation ranges 13.

[0184] As the further exemplary embodiment in Fig. 6 shows, the shape of the profile contour 2 is not limited to the shapes shown in Figures 4 and 5. Thus, according to Fig. 6, the profile contour 2 has a projection 4 in the (or in a) deviation region 13 which has a different shape from other projections. While in the exemplary embodiments in Figures 3 to 5 the contact surfaces 3 of the profile contour 2 (measured in the radial plane shown) enclose an interior angle of (approximately) 120° at the outward-facing projections 4 and an interior angle of (approximately) 210° at the recesses 5, the exemplary embodiment in Fig. 6 also includes interior angles with other values. For example, at the recesses identified by the reference numeral 5, the interior angle is (approximately) 270°.According to other variants not shown, other shapes of the profile contour 2 are also possible, in particular with other internal angles and / or with contact surfaces 3 of different sizes, etc.

[0185] In the further embodiment of Fig. 7, the outward-facing projection of the profile contour 2, designated by reference numeral 4, has an interior angle that is (significantly) less than 120°, namely approximately 60°. As a result, there is (essentially) no surface contact between the profile contour 2 and the profile contour 42 at this point, but rather (with a corresponding axial extension of the profile contour 2) a line contact, which, however, appears only as a point contact in the two-dimensional representation of Fig. 7.

[0186] Fig. 8 shows two exemplary embodiments. In the first exemplary embodiment, shown only in solid lines, the profile contour 2 of the tool connection device 1 predominantly corresponds, namely in a first partial area or area of ​​correspondence 12, to the profile contour 42 of the machine connection device 40. In a second partial area or area of ​​deviation 13, however, the profile contour 2 deviates from the profile contour 42 in that the profile contour 2 in this partial area 13 connects two outward-facing projections - the two upper projections designated by the reference numeral 4 - by a (substantially) flat surface 14a, although "in between" there is a further, outwardly recessed 45 of the profile contour 42 of the machine connection device 40. In this second partial area or area of ​​deviation 13, the profile contour 2 runs within the volume defined by the profile contour 42.In this embodiment, the profile contour 2 has only eleven outward-facing projections 4 and ten inwardly recessed recesses 5.

[0187] In the second embodiment shown in Fig. 8, a further projection 4 of the profile contour 2 is replaced by a (substantially) flat surface 14a, as indicated by a dashed line. The above explanations apply accordingly. In this embodiment, the profile contour 2 has only ten projections 4 (or only nine projections 4 if the upper right one is not considered a projection because there is no recess 5 between it and the adjacent projections 4 (top left and right)). Furthermore, the profile contour 2 in this embodiment has only eight recesses 5.

[0188] In variants, a different number or arrangement of (flat) connecting surfaces 14a is possible, as long as there is at least one projection 4.

[0189] Fig. 9 shows an embodiment in which the profile contour 2 in a first partial region 12 again (substantially) coincides with the profile contour 42. This first partial region 12 extends relative to the axis of rotation 10 over an angle α (here called the angle of coincidence) of (approximately) 210°. In comparison to the embodiment of Fig. 3, however, a part of the star-shaped profile contour 2, namely in a second partial region or deviation region 13, which extends over an angle β (here called the angle of deviation) of (approximately) 150°, is replaced by a curved connecting surface 14b. In this embodiment, too, the profile contour 2 runs within the volume defined by the profile contour 42. The curved connecting surface 14b may or may not bear against the inward-facing projections 44 of the profile contour 42 of the machine connection device 40.

[0190] In variants of this exemplary embodiment, a plurality of second partial regions or deviation regions 13, in which the profile contour 2 deviates from the profile contour 42, can also be provided, with intermediate first partial regions or matching regions 12, in which the profile contour 2 (substantially) matches the profile contour 42. Furthermore, the second partial region(s) or matching regions 13 can be larger or smaller than shown in Fig. 9. Likewise, the shape of the profile contour 2 in the second partial region 13, i.e., the curved connecting surface 14b, can deviate from the shape shown in Fig. 9.

[0191] Fig. 10 shows a modification of Fig. 9. In the embodiment of Fig. 10, only one projection 4 of the profile contour 2 of the tool connection device 2 is provided, with two adjacent recesses 5. The area between the two recesses 5 forms a matching area or first partial area 12. In this first partial area 12, which extends over a matching angle α of (approximately) 30°, the profile contour 2, i.e. the contact surfaces 3a and 3b, (essentially) matches the profile contour 42. In the much larger deviation area or second partial area 13, which extends over a deviation angle β of (approximately) 330°, the profile contour 2, i.e. the connecting surface 14b, deviates from the profile contour 42. Preferably, however, the curved connecting surface 14b touches the profile contour 42 of the machine connection device 40 at least at the (orsome) inward-facing projections 44, so that a positive connection is produced solely through the contact between the profile contour 2 of the tool connection device 1 and the profile contour 42 of the machine connection device 40, and thus the tool device 30 can be connected in a rotationally fixed manner to the machine tool 50. If the curved connecting surface 14b does not touch the profile contour 42, a positive connection and a rotationally fixed connection between the tool device 30 and the machine tool 50 can nevertheless result, in that the tool device 30 is held on the machine tool 50 by the hook or holding device(s) 46, on the one hand, and there is contact between the profile contour 2 and the profile contour 42 in the matching area 12, on the other hand. For some applications, this can represent sufficient fastening of the tool device 30 to the machine tool 50.

[0192] The embodiment according to Fig. 11 largely corresponds to the embodiment according to Fig. 10. However, according to Fig. 11, the two (essentially flat) contact surfaces 3a and 3b are larger than is the case according to Fig. 10. The contact surfaces 3a and 3b, however, only partially rest on the profile contour 42. Between these contact surfaces 3a and 3b, only one point of the star-shaped polygon remains, also provided with the reference numeral 4 in Fig. 11, although strictly speaking this is not an outward-facing projection because the profile contour 2 - at least in the section shown - does not have any inwardly recessed depressions 5. The contact surfaces 3a and 3b are connected by a curved connecting surface 14b, analogous to Fig. 10. Preferably, the embodiment according to Fig.11, the curved connecting surface 14b contours the profile contour 42 of the machine connection device 40 at least at the inwardly facing projections 44, although this is not mandatory. Regarding the positive locking or the rotationally fixed fastening between the tool device 30 and the machine tool 50, reference is made to the corresponding explanations in connection with Fig. 10.

[0193] Fig. 12 shows a further modification of the embodiment according to Fig. 3. In the embodiment according to Fig. 12, the cross-section of the tool connection device 1, shown in solid lines, forms a hexagon. However, this is 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 connection device 1 has four contact surfaces 3a and 3b, at which the profile contour 2 of the tool connection device 1 (substantially) coincides with the profile contour 42 of the machine connection device 40, so that these areas represent areas of correspondence 12. The (far larger) deviation areas 13 extend in the remaining sections of the circumference of the tool connection device 1 and the machine connection device 40, respectively.

[0194] Fig. 12 also shows, in dashed lines, the central opening 20 for fastening the tool device 30 to the machine tool 50, as well as two possible arrangements of the flange or transition section 7 and the working area 21. In the variant in which the working area 21 is arranged at the top right in Fig. 12, the transition section 7 extends outwards approximately from the center of one of the longer sides of the hexagon, perpendicular to this. In the variant in which the working area 21 is arranged at the bottom right in Fig. 12, the transition section 7 extends in the same orientation as the longer sides of the hexagon and forms, so to speak, an outward extension of the hexagon. Other shapes, sizes and orientations of the profile contour 2 and the transition section 7 are also possible.

[0195] Fig. 13 shows a modification of Fig. 12, wherein here the profile contour 2 does not form a hexagon, but in comparison to the embodiment according to Fig. 12 is curved in a type of cam path such that the respectively opposing contact surfaces 3a and 3b are not in contact with machine contact surfaces 43 which are respectively symmetrically opposite one another with respect to the axis of rotation 10, but with machine contact surfaces 43 which are each offset by 150° with respect to the axis of rotation 10. The two conformity regions 12 thus created each extend over an angle of 30° in this embodiment. A larger of the two deviation regions 13 extends over an angle of 180°, a smaller one over an angle of 120°. In this embodiment, the two conformity regions add up to an conformity angle of 60°, and the two deviation regions add up to a deviation angle of 300°. A form-fitting orA rotationally fixed fastening between the tool device 30 and the machine tool 50 can possibly already be achieved by the contact on the contact surfaces 3a and 3b, if necessary also by the fastening of the tool device 30 by means of the holding or hook devices 46 in the area of ​​the central opening 20. Under certain circumstances, the transition area 7 can also lie on the underside of the machine connection device 40, whereby the contact between the contact surfaces 3a or 3b and corresponding machine contact surfaces 43 is possibly improved if the tool device 30 is clamped against the machine connection device 40 by means of the holding or hook devices 46.

[0196] Fig. 14 shows a further modification of the embodiment according to Fig. 12. In the embodiment according to Fig. 14, the profile wall 2a is only in contact with corresponding machine contact surfaces 43 in the area of ​​two adjacent contact surfaces 3a and 3b. A positive or rotationally fixed fastening between the tool device 30 and the machine tool 50 can possibly already result from the contact at the contact surfaces 3a and 3b and the fastening of the tool device 30 by means of the holding or hook devices 46 in the area of ​​the central opening 20. Under certain circumstances, the transition region 7 can also rest on the underside of the machine connection device 40, whereby the contact between the contact surfaces 3a or 3b and corresponding machine contact surfaces 43 is possibly improved if the tool device 30 is clamped against the machine connection device 40 by means of the holding or hook devices 46.

[0197] Previously, using Figures 2 to 14 as an example, it was explained that and to what extent the profile contour 2 of the tool connection device 1 can deviate from the profile contour 42 of the machine connection device 40 in the circumferential direction. However, a deviation between profile contour 2 and profile contour 42 can also occur, particularly in sections, in the axial direction or in the axial extension of the tool connection device 1. This will be explained using several exemplary embodiments with reference to Figures 15 to 31.

[0198] A deviation between profile contour 2 and profile contour 42 can also occur both in the circumferential direction (as explained with reference to Figures 2 to 14) and in the axial direction (as explained below with reference to Figures 15 to 31). In other words, any deviation in the circumferential direction or any of the exemplary embodiments according to Figures 2 to 14 can be combined within the scope of the invention with any deviation in the axial direction or any of the exemplary embodiments according to Figures 15 to 31. Furthermore, it is possible for a tool device 30 to have several types of deviations in the circumferential direction and / or several types of deviations in the axial direction, optionally in different cross-sections and / or different angular ranges relative to the rotation axis 10.

[0199] Fig. 15 shows a cross section of a machine connection device 40 and a tool connection device 1 in a plane parallel to the rotation axis 10 according to an embodiment of the present invention.

[0200] The axis of rotation 10 runs vertically in the plane of the drawing in Fig. 15. The machine connection device 40 is arranged symmetrically or coaxially around the axis of rotation 10. Due to the inclination of the profile contour or the inner profile 42 of the machine connection device 40, the space beneath the machine connection device 40 forms a trapezoid in the cross-section shown. Also shown are two hook devices 46 of the machine tool 50, which serve to fasten the tool device 30 or to clamp the outer profile 2 of the tool connection device 1 against the inner profile 42 of the machine connection device 40. In Figures 15 to 31, the profile contour 2 of the tool connection device 1 is again shown at a certain distance from the profile contour 42 of the machine connection device 40 for the sake of clarity. However, during intended use, the profile contour 2 rests against the profile contour 42 at least in some areas.

[0201] As shown in Fig. 15, the tool device 30 has a flange or transition section 7, at one end of which a working area 21 is provided. The flange 7 is located (relative to the axis of rotation 10) in the region of a first (lower) end plane 18, which is indicated by dashed lines. Above the flange 7 rises the tool connection device 1 with a profile wall 2a (shown here as trapezoidal) with profile contour 2. Adjoining the upper end of the profile wall 2a in the region of a second (upper) end plane 19, indicated by dashed lines, is the cover section 6, which also forms part of the tool connection device 1. The cover section 6 has the previously described central opening 20, through which the hook devices 46 or other holding devices 46 extend. While the profile contour 2 of the tool connection device 1 in the embodiment shown in Fig.While the section shown in Fig. 15 essentially corresponds to the profile contour 42 of the machine connection device 40, this is not necessarily the case around the entire circumference of the tool connection device 1. In cross-sections not shown, which deviate from the cross-section shown in Fig. 15, the profile contour 2 may deviate from the profile contour 42, for example, according to one of the examples shown in Figs. 2 to 14 or according to one of the examples described below in Figs. 16 to 31.

[0202] Some features of the combinations of tool device 30 or tool connection device 1 and machine connection device 40 shown in Figures 16 to 31 correspond to the features explained with reference to Figure 15 and are therefore not described again. The following primarily describes only those features in which the exemplary embodiments of Figures 16 to 31 differ from the exemplary embodiment of Figure 15. Furthermore, the hook devices 46, the rotation axis 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 Figures 16 to 31 different features are shown in the right and left halves. This should be understood to mean that the exemplary embodiments shown in these figures can have different features at different locations on the circumference, in particular at opposite locations.On the other hand, these figures are also to be understood as showing two different embodiments, ie a tool device 30 can be designed according to the left half of such a figure or according to the right half of such a figure within the scope of the invention.

[0203] In Fig. 16 (left), the profile contour 2 of the tool connection device 1 does not run parallel to the profile contour 42 of the machine connection device 40, but (essentially) parallel to the rotation axis 10, specifically over its entire axial extent. In this case, the profile contour 2 only abuts the machine connection device 40 at its upper end. This creates a recess 9 in the space (shown triangularly in Fig. 16) between the profile contour 2 and the profile contour 42. In Fig. 16 (right), however, the profile contour 2 runs as described with reference to Fig. 15.

[0204] In Fig. 17 (left), the profile contour 2 of the tool connection device 1 does not run parallel to the profile contour 42 of the machine connection device 40, but (sections thereof) parallel to the axis of rotation 10, although not over its entire axial extent. Instead, the profile contour 2 has a step 17, at which the profile contour 2 runs (essentially) in a radial plane. The step 17 can, for example, be arranged approximately midway between the lower and upper end planes 18, 19, or at another axial position. In this case, the profile contour 2 rests against the machine connection device 40 only at its upper end and at the level of the step 17.

[0205] In Fig. 17 (right), the profile contour 2 has two steps. The steps can divide the axial extension of the tool connection device 1 into axial sections of equal size or (as shown) of different sizes. Furthermore, more than two steps are also possible. Otherwise, the previous explanations apply accordingly with regard to Fig. 17 (left).

[0206] In Fig. 18 (left), profile contour 2 also has a step 17. At this step 17, however, profile contour 2 does not run in a radial plane, but merely changes its inclination. Above step 17, the inclination of profile contour 2 of tool connection device 1 essentially corresponds to the inclination of profile contour 42 of machine connection device 40. Below step 17, profile contour 2 runs (essentially) parallel to rotation axis 10.

[0207] In Fig. 18 (right), profile contour 2 again has a step 17. At this step 17, profile contour 2 runs (essentially) in a radial plane. Furthermore, the inclination of profile contour 2 changes at this axial position. Below step 17, the inclination of profile contour 2 of tool connection device 1 essentially corresponds to the inclination of machine connection device 40. Above step 17, profile contour 2 runs (essentially) parallel to rotation axis 10.

[0208] In Fig. 19 (both sides), the profile contour 2 has (relatively large) rounded portions 8 at its upper end. These extend over a larger area than any rounded portions present at corresponding locations at the upper end of the profile contour 42 of the machine connection device 40, i.e., the rounded portions 8 of the tool device 30 can have a larger radius of curvature than any rounded portions present on the machine connection device 40. Below the rounded portions 8, the inclination of the profile contour 2 of the tool connection device 1 can essentially correspond to the inclination of the profile contour 42 of the machine connection device 40.

[0209] In Fig. 20 (left), the profile contour has a step 17. Above step 17, the inclination of profile contour 2 of tool connection device 1 essentially corresponds to the inclination of profile contour 42 of machine connection device 40. Below step 17, however, profile contour 2 does not run parallel to rotation axis 10 (as was the case in Fig. 17, for example), but merely changes its inclination. In this section, too, the distance of profile contour 2 from rotation axis 10 increases with increasing distance from cover section 6. Below step 17, profile contour 2 runs steeper than above. The opening angle of tool connection device 1 in this section is smaller than the opening angle of tool connection device 1 above step 17 and also smaller than the opening angle of the corresponding section of machine connection device 40.

[0210] In Fig. 20 (right), the profile contour also has a step 17. Below step 17, the inclination of profile contour 2 of the tool connection device 1 essentially corresponds to the inclination of profile contour 42 of the machine connection device 40. However, at the level of step 17, profile contour 2 does not run in a radial plane, and above step 17, it does not run parallel to the rotational axis 10, but merely changes its inclination. In this section, too, the distance of profile contour 2 from the rotational axis 10 increases with increasing distance from cover section 6. Below step 17, profile contour 2 runs more steeply than above. The opening angle of tool connection device 1 in this section is greater than the opening angle of tool connection device 1 below step 17 and also greater than the opening angle of the corresponding section of machine connection device 40.

[0211] In Fig. 21 (left), the profile contour has a step 17. Above step 17, the inclination of profile contour 2 of tool connection device 1 essentially corresponds to the inclination of profile contour 42 of machine connection device 40. Below step 17, profile contour 2 does not run parallel to rotation axis 10, but rather changes its inclination. In contrast to the example in Fig. 20 (left), however, in this section the distance of profile contour 2 from rotation axis 10 decreases with increasing distance from cover section 6.

[0212] In Fig. 21 (right), the profile contour does not have a step 17. However, the inclination of the profile contour 2 of the tool connection device differs from the inclination of the profile contour 42 of the machine connection device 40 in that the distance of the profile contour 2 from the rotation axis 10 decreases with increasing distance from the cover section 6. In this case, the profile contour 2 only rests against the machine connection device 40 at its upper end.

[0213] The embodiment shown in Fig. 22 differs from that of Fig. 15 in that the profile wall 2a has a shorter axial extent on the left side than on the right side. In particular, the profile wall 2a on the left side does not protrude beyond the machine connection device 40 (downward). In this embodiment, the profile wall 2a can also be shortened at other points on the circumference, in particular at the same level as on the far left, as indicated by a line in which dots and dashes alternate. Only in the area on the right, near the transition section 7, does the axial extent of the profile wall 2a increase. Alternatively, the axial extent of the profile wall 2a can increase continuously around the circumference up to the area of ​​the transition section 7, as indicated by the oblique dashed line.

[0214] The embodiment shown in Fig. 23 can be regarded as an extreme case of the embodiment according to Fig. 22. At the left end of the cover section 6, the tool device 30 has no profile wall 2a at all running below the cover section 6. This means that due to the finite material thickness of the cover section 6, the axial extension of the cover section 6 at its left edge represents the profile wall 2a. In this case, the cover section 6 (the “profile contour 2”) may only rest on the machine connection device 40 at its upper end, in particular if the left edge of the cover section 6 runs parallel to the axis of rotation 10. Fig. 23 also shows, in a separate circle, a variant which represents an enlarged section at the left end of the cover section 6 (see small circle).If the left edge of the cover section 6 does not run parallel to the rotation axis 10, but is beveled in such a way that the inclination of this beveled edge of the profile contour 2 essentially corresponds to the inclination of the profile contour 42 of the machine connection device 40, even in this area there may be surface contact - albeit a very small one - between the tool connection device 1 and the machine connection device 40. In the direction of the transition section 7 (i.e. to the right), a profile wall 2a may rise, the height of which increases towards the right. The height of the profile wall 2a may, for example, increase uniformly (in the circumferential direction), as indicated by a diagonally running dashed line. Alternatively, the height of the profile wall 2a may also increase non-uniformly, as indicated by a line in which dots and dashes alternate.

[0215] Fig. 24 shows an embodiment which can essentially correspond to that of Fig. 13. In the embodiment according to Fig. 24, the cover section 6 does not extend all the way to the left of the inclined profile contour 42 of the machine connection device 40. Instead, contact surfaces 3a and 3b are formed on the cover section 6, specifically at locations which correspond to the positions of the contact surfaces 3a and 3b in Fig. 13. These contact surfaces allow the tool connection device 1 to be supported on the machine connection device 40. In addition, the tool connection device 1 can be supported on the machine connection device 40 in the area to the right, i.e. in the direction of the transition section. Optionally, a profile wall 2a whose height increases towards the right can also rise from the contact surfaces 3a, 3b shown, in the direction of the transition section 7 (i.e. to the right).The height of the profile wall 2a can, for example, increase uniformly (in the circumferential direction), as indicated by an oblique dashed line.

[0216] Fig. 25 illustrates an embodiment which can be regarded as a variant of Fig. 24 and has also already been explained in connection with Fig. 13. In contrast to the embodiment of Fig. 24, the profile contour 2 of the tool connection device 1 is less steep in the right-hand half than the profile contour 42 of the machine connection device 40. Thus, there is no contact between the profile wall 2a and the profile wall 42a in this area. Instead, a positive connection between the tool device 30 and the machine tool 50 can result from the contact surfaces 3a and 3b bearing against the profile wall 42a and, in addition, the tool device 30 is held on the machine tool 50 by means of hooks or other holding devices 46. If necessary, the flange 7 can also bear against the underside of the machine connection device 40, as already described.

[0217] In the exemplary embodiment according to Fig. 26, the profile contour 2 of the tool connection device 1 can essentially correspond to the profile contour 42 of the machine connection device 40 (at least in sections). In contrast to the exemplary embodiment according to Fig. 15, in which the entire tool connection device 1 can be manufactured with a substantially constant wall thickness, according to Fig. 26 the wall thickness (i.e. thickness) td in the region of the cover section 6 differs from the wall thickness tk in the region of the contact surfaces 3 or the profile contour 2. In particular, the wall thickness tk can be greater than the wall thickness td, for example at least twice as great.

[0218] 27, the wall thickness tk in the area of ​​the contact surfaces 3 or the profile contour 2 can be greater than the wall thickness td in the area of ​​the cover section 6. In this case, the profile wall 2a can be double-walled, with an inner wall 22 and an outer wall 23. In the part of Fig. 27 shown on the left, these run essentially parallel to one another and also parallel to a machine contact surface 43. In this case, the material thickness of the inner wall 22 and the outer wall 23 can be the same or different and also the same or different compared to the wall thickness td of the cover section 6. In the case of such a double- or multi-walled profile wall 2a, however, the wall thickness tk is the total thickness of the profile wall 2a, i.e. in the example shown, the sum of the material thicknesses of the inner wall 22 and the outer wall 23 and the distance between them.The wall thickness tk can be measured in a radial plane, as indicated by the upper double arrow in the left half of Fig. 27. However, the wall thickness tk can also be measured in a direction perpendicular to a corresponding contact surface 3, as indicated by the lower double arrow in the left half of Fig. 27. This results in (slightly) different values ​​for the wall thickness tk.

[0219] The right half of Fig. 27 shows an embodiment in which the outer wall 23 runs parallel to a machine contact surface 43, but the inner wall 22 does not. The inner wall 22 can, for example, run parallel to the rotational axis 10. In this case, the wall thickness tk can be defined, for example, as the minimum or maximum value of all wall thicknesses in the area of ​​the contact surfaces 3, or, as indicated in Fig. 27, as the mean value.

[0220] In Figures 28 and 29, the machine connection device 40 is shown in cross-section, as in the preceding figures, while the tool connection device 1 is shown in a side view. Accordingly, the profile wall 2a of the tool connection device 1 is shown with a plurality of contact surfaces 3 and, between them, alternating, outward-facing projections 4 and inwardly recessed recesses 5. Several types of recesses 9 are shown in the profile wall 2a. These can represent different exemplary embodiments, although two or more different recesses 9 can also be provided in the profile wall 2a of a single exemplary embodiment. In the example shown, a recess 9 can, for example, be zigzag-shaped (left), as a strip (center), or round / oval (right). A single recess 9 can be limited to one contact surface 3 or extend over two or more contact surfaces 3.

[0221] Fig. 29 shows further examples of recesses 9 in a profile wall 2a, which may have a wave shape or a kink.

[0222] While the profile contour 2 of the profile wall 2a according to Fig. 28 or 29 is interrupted in its course by the recesses 9 and thus deviates from a profile contour 42 of the machine connection device 40 at least at the level of the recesses 9, the profile contour 2 can, if necessary, coincide with the profile contour 42 of the machine connection device 40 at other axial positions, i.e. outside the recesses 9.

[0223] Fig. 30 shows features that can be combined with any of the other embodiments described herein. In the left half of Fig. 30, the cover section 6 has a recess 25, i.e., a downwardly facing depression. In the right half of Fig. 30, however, the cover section 6 has a raised region 24. The downwardly facing recess 25 and the raised region 24 are designed as blind holes, i.e., closed at the axial end. Instead, the axial end could also be open. Likewise, the recess 25 could be designed as a through-bore instead of a blind hole.

[0224] The recess 25 and the raised region 24 can interact with corresponding features 26 and 27 of the machine connection device 40. In particular, the recess 25 and the raised region 24 can function as a coding device, for example, such that the tool device 30 can only be used in a specific orientation relative to the machine tool 50 or such that the compatibility of the tool device 30 with machine tools from different manufacturers or with certain types of machine tools from a specific manufacturer is ensured. One or more such or other types of coding devices can be provided on the cover section 6.

[0225] Fig. 31 shows—similar to Figs. 28 and 29—the machine connection device 40 in cross-section and the tool connection device 1 in a side view. Accordingly, the profile wall 2a of the tool connection device 1 is shown with several contact surfaces 3 and, between them, alternating, outward-facing projections 4 and inwardly recessed recesses 5.

[0226] The profile wall 2a has a plurality of recesses 9, 9a, or 9b. As shown in the middle and left-hand part, wider recesses 9a and narrower recesses 9b can alternate (in the circumferential direction). For example, wider recesses 9a can be arranged on some or all of the projections 4 of the side wall 2a, and narrower recesses 9b can be arranged on some or all of the depressions 5 of the side wall 2a, as also shown in Fig. 2. The recesses 9a and 9b can have similar shapes and the same length and position in the axial direction, as shown in the left half of Fig. 31. The right half of Fig. 31, on the other hand, shows recesses 9 at different axial positions and with lengths (in the axial direction) that differ from those in the left half.

[0227] Fig. 32 shows a cross-sectional view of a detailed view of a tool device 30 in a plane parallel to the axis of rotation 10 according to an exemplary embodiment of the present invention. The section shown shows the profile wall 2a, a part of the cover section 6, as well as the transition section 7 and the working area 21. Fig. 32 also shows rounded portions 8 at the transitions from the profile wall 2a to the cover section 6 and to the transition section 7. As previously described, the cover section 6 is arranged in the region of an upper end plane 19, and the transition section 7 is arranged in the region of a lower end plane 18. As shown in Fig. 32, the profile wall extends between the rounded portions 8 and thus has an axial extent Ep. The tool connection device as a whole, or the distance between the lower and upper end planes 18, 19, has an axial extent Ew.Depending on the size of the rounded portions 8, the profile wall 2a of the tool connection device 1 can extend over an axial area Ep that corresponds to less than 100% of the extension Ew of the tool connection device 1, for example, at most 90% or at most 80% or at most 70% or at most 60% or at most 50% of the axial extension Ew of the tool connection device 1. If the rounded portions 8 have the same axial extension, the profile wall 2a can be arranged centrally with respect to the axial extension Ew of the tool connection device 1; otherwise, it can be arranged non-centrally with respect thereto.

[0228] In further variants not shown in the figures, which can be based on any of the embodiments described here, it is provided that the central opening 20 of the tool device 30 forms part of a radial, for example U-shaped, opening in the cover section 6, which extends along a radial line to the edge of the cover section 6. The radial line along which the radial opening in the cover section 6 extends can, in particular, enclose an angle other than 0° with the longitudinal axis of the tool device 30, for example an angle in the range between approximately 120° and 150°. The radial or U-shaped opening in the cover section 6 is followed by an opening or interruption in the profile wall 2a, so that the tool device 30 is open on one side. This offers the possibility of also using such a tool device 30 with machine tools 50 which have an output shaft orOscillation axis with a clamping part at the lower end of the output shaft and in which this clamping part has a larger cross-section than the cross-section of the central opening 20 of the tool device 30. In such machine tools 50, the tool device 30 is moved from one 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 part at the lower end of the output shaft - if necessary in interaction with a clamping part arranged further up on the output shaft. In these variants, the U-shaped opening in the cover section 6 and the adjoining opening or interruption in the profile wall 2a can have a substantially constant or variable width. For example, the U-shaped opening in the cover section 6 and the adjoining opening or interruption in the profile wall 2aInterruption in the profile wall 2a can be defined by two (at least in sections) substantially parallel edges in the cover section 6 or in the profile wall 2a.

[0229] A manufacturing method of a tool connection device 1 is explained below with simultaneous reference to Figures 33, 34, and 37. Figures 33 and 34 show various stages in the manufacturing process of the tool connection device 1, while Figure 37 illustrates the process sequence in general.

[0230] After the start 80 of the method, a workpiece 60 is provided in a step 81, from which the tool connection device 1 is to be manufactured. The workpiece 60 can initially be in the form of a flat, round disk 60, for example made of hardened sheet steel. The disk 60 thus has a flat region 61, which, however, in this exemplary embodiment extends over the entire disk 60. The material thickness of the disk 60 can, for example, be in a range between 0.75 and 3 mm, preferably between 1 and 1.5 mm. Initially, the workpiece 60 can be without any contours, recesses, etc.

[0231] In a step 82, the disc 60 is provided with a plurality of recesses, in particular with a central opening 20, as well as a plurality of recesses 62, 63, 64 arranged around this central opening 20. Depending on the embodiment, the recesses 62 to 64 can have different shapes and sizes and be arranged at different radii from the center of the disc 60.

[0232] Fig. 33 shows three different types of such recesses 62 to 64, located at different radii. The central radius is indicated as a circle with a dashed line. In this exemplary embodiment, the disk 60 has recesses 63 distributed regularly around the circumference on this central radius, each offset by 15°. For reasons of clarity, however, only three of these recesses 63 are shown. The recesses 63 are located in an (annular) area from which the profile wall 2a of the tool device is later formed.

[0233] The recesses 64 on the outer radius (near the outer periphery of the disk 60) can also be evenly distributed in the circumferential direction, for example, each offset by 30°, as shown in Fig. 33. These recesses 64 can be designed as weld points or as through holes for screws, rivets, etc. for later connection to the plate 28 (Fig. 35), as described above. The recesses 62 on the inner radius can serve as coding devices, as described above, or ensure compatibility with various types of machine tools. Here, too, only two recesses 62 offset by 30° are shown. Corresponding further recesses 62 can be provided, so that the disk 60 can have, for example, twelve recesses 62 in this area.

[0234] In a further method step 83, the initially flat disk 60 is deformed, for example by a deep-drawing process or the like, in order to convert the disk 60 into the three-dimensional tool connection device 1, which is shown in Fig. 34. In this method step 83, an inner region of the disk 60 - in this example a region which is indicated in Fig. 34 by the inner of the two star-shaped polygons and whose outer edge runs between the recesses 62 and 63 - is offset relative to the outer ring in which the recesses 64 are located and which is indicated in Fig. 34 outside the larger of the two star-shaped polygons, so that this inner region is located on a different radial plane than the outer ring.

[0235] As shown in Fig. 34, the inner region forms the cover section 6 of the tool connection device 1. The outer ring, in contrast, represents the transition section or flange 7. The middle region between the two star-shaped polygons shown in Fig. 34 forms the profile wall 2a, which extends between the flange 7 and the cover section 6 and whose contact surfaces 3 are inclined both with respect to a (radial) plane in which, for example, the flange 7 runs, and with respect to the axis of rotation 10 - which runs perpendicular to the plane of the drawing. Because the three-dimensional structure of the tool connection device 1 is not immediately apparent in the two-dimensional representation in Fig. 34, reference is also made (again) to Fig. 2.

[0236] Due to the deformation taking place in step 83, the recesses 63 of Fig. 33 are also deformed. Firstly, due to the deformation (for example by deep drawing), the recesses 63 become longer (“higher”) - in the two-dimensional representation of Fig. 34, this is illustrated by the fact that the radial extent of the recesses 63 (marked as recesses 9a and 9b in Fig. 34) has increased. Secondly, due to the deformation, those recesses 63 become wider (in the circumferential direction) which are ultimately located at the locations of the outward-facing projections 4 of the profile wall 2a - in Fig. 34, these are the recesses 9a. In contrast, due to the deformation, those recesses 63 become narrower (in the circumferential direction) which are ultimately located at the locations of the inwardly recessed depressions 5 of the profile wall 2a - in Fig. 34, these are the recesses 9b.

[0237] After step 83, the method can end (step 84).

[0238] It was previously mentioned that the provision of recesses 9a and 9b at the locations of the projections 4 and depressions 5, respectively, can increase the torque transmission capacity—compared to a tool connection device that, instead of such recesses, has rounded portions between adjacent contact surfaces 3, but is otherwise essentially identical. This increased torque transmission capacity is due to the fact that torque from the machine connection device 40 is predominantly or even exclusively transmitted to the tool connection device 1 through contact surfaces 3, but not (or only to a small extent) via the rounded portions between two adjacent contact surfaces 3.For manufacturing reasons, however, such rounded portions require a certain length in the circumferential direction, in particular to distribute material stresses occurring during a deep-drawing process over a sufficiently large area - if there is a sharp edge between two contact surfaces 3, the material could break at this point during the deep-drawing process. The inventors have found that the added total length (in the circumferential direction) of all recesses 9a and 9b can be made smaller than the added total length (in the circumferential direction) required for such rounded portions. In other words, despite the recesses 9a and 9b, or precisely because of these recesses, the total area of ​​the contact surfaces 3 can be increased compared to an (otherwise identical) embodiment with rounded portions between the contact surfaces 3. A correspondingly greater torque can be transmitted over an area increased in this way.

[0239] As a variant of the embodiment according to Figs. 33 and 34, the recesses 63 can also be dimensioned differently, in particular such that in step 82, those recesses 63 that are provided for positions on projections 4 and which later become the recesses 9a are formed narrower in the circumferential direction than those recesses 63 that are provided for positions on depressions 5 and which later become the recesses 9b. With appropriate dimensioning, the recesses 9a and 9b can then have essentially the same length in the circumferential direction after deep drawing. List of reference symbols

[0240] 1 tool connection device

[0241] 2 Profile contour / outer profile of the tool connection device

[0242] 2a Profile wall (of the tool device)

[0243] 3 contact surfaces

[0244] 3a, 3b individual contact surfaces

[0245] 4 projection (of the tool connection device)

[0246] 5 Recess (of the tool connection device)

[0247] 6 Lid section

[0248] 7 Transition section / flange

[0249] 8 Rounding

[0250] 9 recesses

[0251] 9a Recess in the area of ​​a projection

[0252] 9b Recess in the area of ​​a depression

[0253] 10 axis of rotation

[0254] 12 Compliance area(s) / first sub-area(s) of the tool connection device

[0255] 13 Deviation range(s) / second sub-range(s) of the tool connection device

[0256] 14a, b (connecting) surface

[0257] 17th level

[0258] 18 first finishing level / lower finishing level

[0259] 19 second finishing level / upper finishing level

[0260] 20 (central) opening

[0261] 21 Work area

[0262] 22 inner side wall

[0263] 23 outer side wall

[0264] 24 (raised) coding device (of the tool device)

[0265] 25 (designed as a recess) coding device (of the tool device)

[0266] 26 (raised) coding device (of the machine tool)

[0267] 27 (designed as a recess) coding device (of the machine tool)

[0268] 28 plate

[0269] 30 Tool setup

[0270] 40 Machine connection device

[0271] 41 Drive shaft

[0272] 42 Profile contour / inner profile of the machine connection device

[0273] 42a Profile wall (of the machine tool) 43 Machine contact surface

[0274] 44 projection (of the machine connection device)

[0275] 45 recess (of the machine connection device)

[0276] 46 Holding or hook device

[0277] 47 Normal vector (on machine contact surface)

[0278] 48 upper end face (of the machine connection device)

[0279] 49 lower end face (of the machine connection device)

[0280] 50 machine tools

[0281] 55 Machine tool and tool setup combination

[0282] 60 workpieces / disk

[0283] 61 flat area

[0284] 62-64 Recess / opening (in workpiece)

[0285] 80-84 procedural steps

[0286] Ew axial extension of a tool connection device

[0287] Ep axial extension of a profile contour of the tool connection device l_A length of a recess (in circumferential direction)

[0288] LK Length of a contact surface (in circumferential direction) tk Wall thickness (in the area of ​​a contact surface) td Wall thickness (in the area of ​​the cover section) a Conformity angle ß Deviation angle

Claims

PATENT CLAIMS:

1. A tool device with at least one working area suitable for acting on a workpiece, which is intended for use with a particularly hand-held machine tool, wherein the machine tool has a rotary-oscillating drive shaft which moves at least 10 times per second in a first direction of rotation about a machine-fixed axis of rotation and then reverses the movement and moves in a second, opposite direction of rotation, wherein on this drive shaft and coaxially thereto a machine connection device is arranged with an inner profile which widens conically in the direction of the axis of rotation and which has a profile contour surrounding the axis of rotation with a number of twelve convex projections projecting inwards towards the axis of rotation and twelve concave depressions which form an uninterrupted, essentially continuously extending profile wall,which are arranged substantially rotationally symmetrically around the axis of rotation, wherein this conical widening is oriented such that the region of the inner profile with the smaller inner diameter is located closer to the machine tool, which is referred to as the top, and the region with the larger inner diameter is located at a greater distance from the machine tool, which is referred to as the bottom, wherein this drive shaft has a holding device for holding the tool device, and wherein the tool device has a tool connection device which is connectable in a substantially rotationally fixed manner to this machine connection device in order to transmit torques and forces between the machine tool and the tool device, so that the tool device executes a rotationally oscillating movement coaxially to this drive shaft,wherein the tool connection device has an outer profile with a profile contour running around the axis of rotation with at least one outwardly facing projection, wherein this at least one projection is designed to engage in these recesses of the inner profile of the machine connection device when connected to the machine tool, and wherein the at least one outwardly facing projection has at least two contact surfaces, wherein at least one of these contact surfaces is provided for transmitting the rotational movement of the machine connection device to the tool connection device in the first direction of rotation, and wherein at least a second of these contact surfaces is provided for transmitting the rotational movement of the machine connection device to the tool connection device in the second direction of rotation, wherein the profile contour of the tool connection device is designed differently from the profile contour of the machine connection device and differs from the profile contour of the machine connection device at least in that a) the number of projections of the tool device is taken from a group consisting of the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 and 11, in particular is taken from a group consisting of the numbers 1, 2, 3, 4, 5, 8, 9, 10 and 11, and / or b) the number of projections of the tool device is 13 or more,and / or c) the profile contour of the tool connection device deviates from the profile contour of the machine connection device in at least two, in particular at least three, areas offset by the circumference of the profile contour and / or d) the profile contour of the tool connection device is not conical but runs parallel to the axis of rotation and / or e) the profile contour of the tool connection device is inclined relative to the axis of rotation and wherein the profile contour of the tool connection device is inclined differently than the profile contour of the machine connection device and / or f) the profile contour of the tool connection device has a number of at least two, in particular at least three, recesses and / or g) the profile contour of the tool connection device has a recess which is at least 40%, in particular at least 45%,in particular represents at least 50% of the circumference of the profile contour of the tool connection device and / or h) the profile contour of the tool connection device has at least one matching area in which the profile contour of the tool connection device, coincides with the profile contour of the machine connection device, and has at least one deviation range in which the profile contour of the tool connection device deviates from the profile contour of the machine connection device, wherein the at least one correspondence range extends in total over a correspondence angle of at most 225°, in particular at most 220°, 210°, 200°, 190°, 180°, 170°, 160°, 150°, 140°, 130°, 120°, 110°, 100°, 90°, 80°, 70°, 60°, 50°, 40°, 30°, 20° or 10°, measured in the circumferential direction around the axis of rotation, and the at least one deviation range extends in total over a deviation angle, wherein the correspondence angle + deviation angle = 360° and / or i) the The profile contour of the tool connection device does not have the shape of a regular hexagon or a heptagon in at least one, in particular several, in particular all, planes perpendicular to the axis of rotation.Tool device according to claim 1, wherein, if at least a) applies, the profile contour of the tool connection device substantially coincides with the profile contour of the machine connection device over a first partial region and deviates from the profile contour of the machine connection device over a second partial region, wherein the profile contour of the tool connection device in the second partial region runs within a volume that is defined by the inner profile of the machine connection device. Tool device according to claim 2, wherein the profile contour of the tool connection device in the second partial region connects two outwardly facing projections by means of a substantially flat surface (14a) or a curved surface (14b).Tool device according to claim 1 or 2, wherein, if the tool device has only a single outwardly facing projection, the profile contour of the tool connection device in the second partial region connects the two contact surfaces of this single projection by at least three substantially flat surfaces (14a) or by at least one substantially curved surface (14b) or by at least one substantially flat surface (14a) and at least one substantially curved surface (14b). Tool device according to claim 1 or any other of the preceding claims, wherein, if at least b) applies, the profile contour of the tool. The connection device essentially coincides with the profile contour of the machine connection device over a first partial area and deviates from the profile contour of the machine connection device over a second partial area, wherein the profile contour of the tool connection device in the second partial area runs within a volume defined by the inner profile of the machine connection device. Tool device according to claim 5, wherein the profile contour of the tool connection device in the second partial area has more outward-facing projections than the machine connection device has concave depressions.Tool device according to claim 1 or any other of the preceding claims, wherein, if at least c) applies, the regions in which the profile contour of the tool connection device substantially coincides with the profile contour of the machine connection device define a plurality of first partial regions, and wherein the regions in which the profile contour of the tool connection device deviates from the profile contour of the machine connection device define a plurality of second partial regions, wherein the profile contour of the tool connection device in the second partial regions runs within a volume which is defined by the inner profile of the machine connection device. Tool device according to claim 7, wherein the profile contour of the tool connection device in:. - exactly one of the second sub-areas or - at least one of the second sub-areas or - several of the second sub-areas or - several, but not all, of the second sub-areas or - all second partial areas in a first cross section perpendicular to the rotational axis substantially coincide with the profile contour of the machine connection device and in a second cross section perpendicular to the rotational axis different from the first cross section deviates from the profile contour of the machine connection device. Tool device according to claim 7, wherein the profile contour of the tool connection device in - exactly one of the second sub-areas or - at least one of the second sub-areas or - several of the second sub-areas or - several, but not all, of the second sub-areas or - all second partial regions deviate from the profile contour of the machine connection device in all cross-sections perpendicular to the axis of rotation. Tool device according to claim 1 or another of the preceding claims, wherein, if at least d) applies, the profile contour of the tool connection device in at least a first cross-section perpendicular to the axis of rotation substantially coincides with the profile contour of the machine connection device. Tool device according to claim 1 or another of the preceding claims 1 to 9, wherein, if at least d) applies, the profile contour of the tool connection device deviates from the profile contour of the machine connection device in all cross-sections perpendicular to the axis of rotation.Tool device according to claim 1 or another of the preceding claims, wherein, if at least e) applies, the profile contour of the tool connection device is steeper than the profile of the inner profile of the machine connection device. Tool device according to claim 1 or another of the preceding claims, wherein, if at least f) applies, at least one of the recesses is arranged between two adjacent contact surfaces. Tool device according to claim 13, wherein at least one of the recesses is arranged between two adjacent contact surfaces such that the two adjacent contact surfaces do not touch in at least one, in particular several, in particular all, cross-sections perpendicular to the axis of rotation.Tool device according to claim 13 or 14, wherein, in the circumferential direction of the circumferential profile contour of the tool connection device, at least one of the recesses has a length LA and a contact surface adjacent to this recess has a length LK, wherein 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. Tool device according to one of claims 13 to 15, wherein at least one, in particular several, in particular all, of the recesses are arranged in the circumferential direction of the circumferential profile contour of the tool connection device at angular positions at which a projection of the tool connection device is provided.

17. Tool device according to one of claims 13 to 16, wherein the profile contour of the tool connection device has at least one radially inwardly facing recess, in particular wherein the at least one recess of the tool connection device is arranged between two adjacent contact surfaces or is formed by two adjacent contact surfaces.

18. Tool device according to claim 17, wherein at least one, in particular several, in particular all, of the recesses are arranged in the circumferential direction of the profile contour of the tool connection device at angular positions at which a recess of the tool connection device is provided, in particular wherein at least one, in particular several, in particular all, of the recesses at an angular position of a projection of the tool connection device has or have a greater length in the circumferential direction of the profile contour of the tool connection device than at least one, in particular several, in particular all, of the recesses at an angular position of a recess of the tool connection device.

19. Tool device according to claim 1 or any other of the preceding claims, wherein, if at least g) applies, the recess extends in at least one plane perpendicular to the axis of rotation over at least 40%, in particular at least 45%, in particular at least 50% of the circumference of the profile contour of the tool connection device, or wherein the recess does not extend in any plane perpendicular to the axis of rotation over at least 50%, in particular at least 45%, in particular at least 40% of the circumference of the profile contour of the tool connection device. in particular wherein the recess extends over different planes running perpendicular to the axis of rotation. Tool device according to claim 1 or any other of the preceding claims, wherein, if at least h) applies, the profile contour of the tool connection device deviates in the at least one deviation range from the inner profile of the machine connection device in that - the profile contour of the tool connection device is set back radially inwards in relation to the inner profile of the machine connection device to the rotation axis, in particular runs on a smaller radius or smaller radii than a corresponding area of ​​the inner profile of the machine connection device and / or - the profile contour of the tool connection device has a different inclination to the rotation axis in relation to the inner profile of the machine connection device, in particular runs parallel to the rotation axis and / or - the profile contour of the tool connection device has a recess and / or - the profile contour of the tool connection device has a stepped structure. Tool device according to claim 1 or 20, wherein, if at least h) applies - the profile contour of the tool connection device has at least two discrete deviation ranges, in particular at least three discrete deviation ranges, and / or - the profile contour of the tool connection device has at least two discrete matching areas, in particular at least three discrete matching areas, and / or - the profile contour of the tool connection device deviates from the inner profile of the machine connection device in at least one deviation range in all planes running perpendicular to the rotation axis, or the profile contour of the tool connection device coincides with the inner profile of the machine connection device in at least one deviation range in at least one, in particular in several, but not all, planes running perpendicular to the rotation axis. Tool device according to one of the preceding claims, wherein the at least two contact surfaces, in particular all contact surfaces, of the tool connection device extend between a first and a second end plane, which are arranged perpendicular to the rotation axis and spaced from one another, wherein the tool device has a transition section which connects the tool connection device to the working area and which preferably, relative to the axis of rotation, in particular substantially at the level of the first end plane, adjoins the tool connection device, and wherein the tool device has a cover section which extends from the outer profile of the tool connection device in the direction of the axis of rotation and which, relative to the axis of rotation, is located, in particular substantially, at the level of the second end plane. Tool device with at least one working area suitable for acting on a workpiece, which is intended for use with a particularly hand-held machine tool, wherein the machine tool has a rotary-oscillating drive shaft which moves at least 10 times per second in a first direction of rotation about a machine-fixed axis of rotation and then reverses the movement and moves in a second, opposite direction of rotation,wherein on this drive shaft and coaxially thereto, a machine connection device is arranged with an inner profile that widens conically in the direction of the rotational axis, which has a profile contour surrounding the rotational axis with a number of twelve convex projections projecting inwards towards the rotational axis and twelve concave depressions that form an uninterrupted, essentially continuous profile wall that is arranged essentially rotationally symmetrically around the rotational axis, wherein this conical widening is oriented such that the area of ​​the inner profile with the smaller inner diameter is located closer to the machine tool, which is referred to as the top, and the area with the larger inner diameter is located at a greater distance from the machine tool, which is referred to as the bottom, wherein this drive shaft has a holding device for holding the tool device,and wherein the tool device has a tool connection device which can be connected to this machine connection device in a substantially rotationally fixed manner in order to transmit torques and forces between the machine tool and the tool device, so that the tool device executes a rotationally oscillating movement coaxially to this drive shaft, wherein the tool connection device has an outer profile with a profile contour surrounding the rotation axis with at least one outwardly facing projection, wherein said at least one projection is configured to engage in said recesses of the inner profile of the machine connection device when connected to the machine tool, and wherein the at least one outwardly facing projection has at least two contact surfaces, wherein at least one of said contact surfaces is provided to transmit the rotational movement of the machine connection device to the tool connection device in the first direction of rotation, and wherein at least a second of said contact surfaces is provided to transmit the rotational movement of the machine connection device to the tool connection device in the second direction of rotation, wherein the at least two contact surfaces, in particular all contact surfaces, of the tool connection device extend between a first and a second end plane, which are arranged perpendicular to the axis of rotation and spaced apart from one another,wherein the tool device has a transition section that connects the tool connection device to the working area and that preferably adjoins the tool connection device, in particular substantially at the level of the first end plane with respect to the rotation axis, wherein the tool device has a cover section that extends from the outer profile of the tool connection device in the direction of the rotation axis and that is located, in particular substantially at the level of the second end plane with respect to the rotation axis, wherein the tool device has a wall thickness tk in the region of the contact surfaces and a wall thickness td in the region of the cover section, wherein the wall thickness tk in the region of the contact surfaces is greater than the wall thickness td in the region of the cover section. Tool device according to claim 23, wherein the wall thickness tk in the region of the contact surfaces: - is measured in a direction perpendicular to the corresponding contact surface, or - is measured in a direction corresponding to a projection of a perpendicular to the corresponding contact surface onto a plane perpendicular to the axis of rotation and preferably - is defined as the mean value of all wall thicknesses in the area of ​​the contact surfaces, or - is defined as the maximum value of all wall thicknesses in the area of ​​the contact surfaces, or - is defined as the minimum value of all wall thicknesses in the region of the contact surfaces. Tool device according to claim 23 or 24, wherein the wall thickness td in the region of the cover section is measured in a direction parallel to the axis of rotation and preferably - is defined as the average value of all wall thicknesses in the area of ​​the cover section, or - is defined as the maximum value of all wall thicknesses in the area of ​​the cover section, or - is defined as the minimum value of all wall thicknesses in the area of ​​the cover section, or - is defined as the wall thickness at the radially innermost point of the cover section. Tool device according to one of claims 23 to 25, wherein the wall thickness tk in the region of the contact surfaces is at least 10%, 20%, or 30% greater than the wall thickness td in the region of the cover section. Tool device according to one of claims 23 to 26, wherein the wall thickness td in the region of the cover section is between 1 mm and 1.5 m. Tool device according to one of claims 22 to 27, wherein the cover section has at least one, in particular central, opening.Tool device according to one of the preceding claims, wherein the profile contour of the tool connection device has a stepped structure, and in particular wherein the stepped structure has a plurality of steps, and in particular wherein, for different steps of the tool connection device, the contact surfaces have a different inclination with respect to the axis of rotation and / or the profile contour of the tool connection device has different cross-sections, in particular in the case of contact surfaces running parallel to the axis of rotation, in a plane perpendicular to the axis of rotation. Machine tool and tool device combination, comprising: a tool device according to one of the preceding claims and a machine tool, wherein the machine tool has a rotationally oscillating drive shaft which rotates at least 10 times per second in a first direction of rotation about a machine-fixed axis. axis of rotation and then reverses the movement and moves in a second, opposite direction of rotation, and wherein on this drive shaft and coaxially there is arranged a machine connection device with an inner profile which widens conically in the direction of the axis of rotation, which has a profile contour surrounding the axis of rotation with a number of twelve convex projections projecting inwards towards the axis of rotation and twelve concave depressions which form an uninterrupted, essentially continuously running profile wall which is arranged essentially rotationally symmetrically around the axis of rotation, wherein this drive shaft has a holding device for holding the tool device. Method for producing a tool device according to one of claims 1 to 29, wherein the method for producing the profile contour of the tool connection device comprises a primary forming, forming,or generative process step or a combination of several such process steps, which are selected from a group consisting of forging, indentation, rolling, extrusion, folding, deep drawing, beading, flanging, straightening, bending, stretching, upsetting, sintering, casting, layer-by-layer deposition, and / or for producing a recess or opening, a separating process step, preferably a thermally separating or a mechanically separating process step, or a combination of several such process steps, which are selected from a group consisting of sawing, grinding, milling, punching, shearing, particle beam cutting, electron beam cutting, laser beam cutting, plasma cutting, flame cutting, and spark erosion cutting. Method according to claim 31, wherein the method comprises the following steps: A) providing a workpiece, the workpiece having a substantially planar region; B) forming at least one recess or opening in the substantially planar region of the workpiece; C) Machining the substantially flat area of ​​the workpiece to produce the profile contour of the tool connection device, wherein step C) is carried out after steps A) and B). Method according to claim 32, wherein the recess or opening produced in step B) forms a recess or opening in the profile contour of the tool connection device, in particular between two adjacent contact surfaces, in particular in the region of an outwardly pointing projection and / or an inwardly concave depression of the profile contour of the tool connection device.

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