Cutting unit, receiving unit and / or holding unit for a cutting device

Abstract

The invention relates to a holding unit (40) for a cutting device (10), in particular a milling device, with a holding area (41), in particular designed as a holding surface, for holding a cutting unit (30), in particular on a receiving unit (20), in particular by friction, and with a holding recess (42), in particular extending along an axis of movement (45), for receiving a threaded unit (50). It is proposed that the holding area (41) extends transversely to, in particular the axis of movement (45), the holding recess (42).

Description

[0001] The invention relates to a cutting unit, receiving unit and / or holding unit for a cutting device according to the preamble of claim 1.

[0002] A large number of different cutting units, receiving units and / or holding units for cutting devices, in particular milling devices, are known from the prior art.

[0003] The invention relates to a cutting unit, receiving unit and / or holding unit for a cutting device according to the preamble of claim 1.

[0004] A large number of different cutting units, receiving units and / or holding units for cutting devices, in particular milling devices, are known from the prior art.

[0005] The invention is based on the objective of improving a cutting unit, receiving unit and / or holding unit for a cutting device by means of simple design measures.

[0006] The task is solved with a cutting unit, receiving unit and / or holding unit for a cutting device.

[0007] The cutting device is designed for machining a workpiece. It is designed as a milling tool. The cutting device can be driven rotaryally around a rotational axis to machine a workpiece by means of a rotary motion. The cutting device represents the tool system designed for the machining of workpieces, particularly by milling. It is not merely a single component, but rather a functional assembly of several coordinated components, namely the mounting unit, the cutting unit (which is particularly replaceable), and the holding unit.

[0008] The cutting device has a mounting unit for receiving a cutting unit. The cutting unit is removable from the cutting device and can be exchanged for another cutting unit or reused. The cutting unit projects transversely to and / or along an axis of rotation. The cutting device is designed as an accessory for a hand-held power tool and is specifically intended to be detachably connected to the power tool. The cutting device is designed to be received and / or held or clamped to the power tool by means of a mounting device. This allows for a particularly reliable and easy-to-use cutting device. Due to the reusability of the cutting unit, the cutting device can be operated in a particularly environmentally friendly manner.The cutting device is also particularly easy to use and, if necessary, very easy to maintain. The holding function of the cutting unit allows for particularly easy and reliable holding of the cutting unit.

[0009] The mounting unit is a component of the cutting device, particularly a milling device. The mounting unit is designed as a support element that forms the mechanical interface between the driving machine tool, especially a hand-held or hand-operated machine, and a cutting unit. Its primary function is to hold the cutting unit, position it precisely, and support it against the forces occurring during operation. The mounting unit is designed to withstand the high rotational speeds and mechanical loads, such as cutting forces and vibrations, that occur during cutting and milling processes, and thus provides a stable and reliable base for the entire tooling system. The mounting unit has a connection area, extending in particular along a rotational axis, for a connection with a machine tool, especially a hand-held machine tool.

[0010] The receiving unit is elongated and extends along a longitudinal axis. The receiving unit is essentially cylindrical. It is essentially designed as a rotating body for rotational motion around an axis of rotation. The longitudinal axis and the axis of rotation essentially coincide. The receiving unit has a connection area or section for connection to a mobile, handheld, or stationary machine tool. The connection area represents the mechanical interface for force and torque transmission from a driving machine tool and is typically designed as a cylindrical or conical shaft that extends coaxially along the central axis of rotation of the receiving unit. The geometric design of the connection area, for example, by defined diameters (e.g.,6 mm, 8 mm, 12 mm), flats, or specific fits enable a connection that is particularly backlash-free and secure, capable of transferring cutting forces from the machining process from the machine to the holding unit. The connection area has a circular cross-section. The connection area forms one end of the holding unit. The holding unit has a working area for machining a workpiece. The working area forms a second end of the holding unit, facing away from the first end. The holding area is shorter than the working area when viewed along its longitudinal axis. The working area adjoins the holding area in the axial direction.

[0011] It may be advantageous for the receiving unit to have a receiving recess for a cutting unit. The receiving recess is designed as a recess, particularly extending along the axis of rotation, for receiving a cutting unit, especially in the direction along the axis of rotation. The receiving recess serves as a seat or pocket, preferably shaped, to securely receive and position an interchangeable cutting unit. This recess is preferably a geometric form within the body of the receiving unit that is aligned with the corresponding counterpart on the cutting unit. The recess is intended to fix the cutting unit in a defined position relative to the axis of rotation and to determine the type of connection – whether purely positive locking, force locking, or a combination of both. The receiving recess is designed to receive a cutting unit.The recess is essentially C-shaped. The recess can also be U-shaped. The recess extends essentially along the axis of rotation. The recess has a closed end facing the first end of the receiving unit, in particular forming a stop. The recess has a second end facing the second end of the receiving unit. The recess is open at the second end, in particular without barriers. The recess has an opening viewed along the axis of rotation. The recess has another opening viewed transversely to the axis of rotation. The recess has a further opening along the axis of rotation. The openings are connected. This allows for particularly simple and reliable mounting of a cutting element.

[0012] It can be advantageous for the receiving recess to increase radially in the direction of the axis of rotation. The receiving recess has an undercut or inwardly opening shape. The "entrance" of the receiving recess at its outer periphery is narrower than its "bottom," which is closer to the axis of rotation. This dovetail- or T-slot-like configuration creates a positive fit in the radial direction. Once a cutting unit with a complementarily shaped base is inserted into this recess, it is securely held in place by the inwardly expanding walls of the receiving recess against the outward centrifugal forces generated during rotation. It can be advantageous for the receiving recess, viewed in cross-section, to essentially form a wedge shape, particularly one defined by three vertices.Two of these vertices define the opening of the recess, particularly the outer and narrower part, and are therefore located closer to the axis of rotation. The third vertex lies further away from the recess, further from the axis of rotation, and forms the outer tip of the wedge. The third vertex is located outside the holding unit. This "inverted" wedge shape, where the base of the wedge represents the opening of the recess and the tip points to the outside of the tool body, creates a dovetail-like or undercut contour. The two vertices of the wedge's cross-section define the holding recess. These two vertices are located between the axis of rotation and the third vertex. The third vertex is located on a side of the two vertices facing away from the axis of rotation. A wedge shape is designed such that one corner of an acute angle of the wedge lies outside the holding unit.The corner of the acute angle is located at least 1 x R, in particular 1.2 x R, preferably 1.5 x R, more preferably 1.8 x R, particularly preferably 2.0 x R, further preferably 2.5 x R, and more preferably 3 x R, away from the axis of rotation in the radial direction. The radius R is defined by the radius, particularly the maximum radius, of the receiving unit in the area of ​​the recess. This allows for particularly simple and reliable holding of the cutting unit in the receiving recess. This makes it particularly easy to hold the cutting unit in or on the receiving unit.

[0013] The receiving unit has a further receiving recess, designed in a manner analogous to the receiving recess. This further receiving recess is arranged diametrically opposite and spaced apart from the receiving recess. The further receiving recess is symmetrical to the receiving recess.

[0014] It may be advantageous for the receiving unit to have an end face, in particular an end surface. The end face can define the receiving recess circumferentially around and / or transversely to the axis of rotation. The end face surrounds the receiving recess. The end face borders the side region. The end face extends transversely, in particular perpendicularly, to the axis of rotation. The end face has an end surface, in particular a flat and / or curved one. The end face, which is preferably designed as an end surface, defines a boundary of the receiving recess along the axis of rotation and forms a geometric and projected boundary plane at the end of the wedge-shaped receiving recess. The end face defines the receiving recess transversely to the axis of rotation. The end face defines the receiving recess circumferentially around the axis of rotation.This creates an upward-facing recess in the forehead area to accommodate a cutting unit.

[0015] It can be advantageous for the receiving unit to have a circumferential region, in particular a circumferential surface, which limits the receiving recess in the circumferential direction around the axis of rotation. The circumferential region has a curved circumferential surface, in particular one that surrounds the receiving unit. The circumferential surface forms the radius of the receiving unit. The circumferential region limits the receiving recess in the circumferential direction around the axis of rotation. The circumferential region represents the outer boundary of the receiving recess in the circumferential direction and encloses the cutting unit. In contrast to the end face, which often serves as an upper stop, this circumferential region forms the outer wall of the recess. The circumferential region limits the receiving recess transversely to the axis of rotation.

[0016] It may be advantageous for the receiving unit to have a side region defining the receiving recess and / or a further side region defining the receiving recess. The receiving recess is formed by two boundary regions or boundary surfaces, the side region and the further side region. These are preferably not arranged parallel to each other, but at an angle to each other. This angle preferably creates the radially inwardly expanding and undercutting geometry of the receiving recess. The two angled side regions partially form the flanks of the wedge and serve as contact and guide surfaces for the complementarily shaped cutting unit, either directly or indirectly. The side regions are angled to each other and / or arranged opposite each other. The side region extends along, in particular parallel to, the axis of rotation and / or transversely, in particular perpendicularly, to the axis of rotation.The side region has a side surface. The side surface is flat. The side regions extend along the entire length of the receiving recess. The projected extensions of the side regions intersect at a distance from the axis of rotation, particularly in a direction opposite to the axis of rotation. An extension of both side regions meets at an intersection point which, with respect to the axis of rotation, lies on the same side as the recess and, in particular, is spaced at a distance of at least a radius R, more specifically at least 1.5 x R, preferably at least 2 x R, preferably at least 3 x R, from the receiving unit when viewed in the radial direction.The side region forms an angle with a radial plane of at least 2°, in particular at least 3°, preferably at least 4°, more preferably at least 5°, more preferably at least 6°, further preferably at least 7°, and / or at most 12°, in particular at most 11°, more preferably at most 10°, and more preferably at most 9°. The side regions are arranged opposite each other at an angle of at least 2°, in particular at least 3°, more preferably at least 4°, more preferably at least 5°, more preferably at least 6°, more preferably at least 7°, and / or at most 12°, in particular at most 11°, more preferably at most 10°, and more preferably at most 9°. The side region is bounded along the axis of rotation by the end face. Transversely to the axis of rotation, the side region is bounded by a circumferential region surrounding the receiving unit. This allows for particularly simple receiving.

[0017] The recording unit has an additional side section, specifically for limiting the recording recess. This additional side section is positioned opposite the main side section.

[0018] The receiving recess becomes smaller with increasing distance from the axis of rotation in the circumferential direction around the axis of rotation. The side regions define the receiving recess, particularly in the circumferential direction around the axis of rotation and / or transversely, particularly perpendicularly, to the axis of rotation. The receiving recess is bounded by two side regions that are not parallel to each other, in particular that are tapered. The side regions define the extent of the recess in the circumferential direction around the axis of rotation. The side regions are spaced apart from each other in the circumferential direction. A circumferential distance of the side regions adjacent to the axis of rotation is greater than a circumferential distance further away from the axis of rotation. A circumferential distance closer to the axis of rotation is greater than a circumferential distance greater away from the axis of rotation.The side regions have a first distance from each other, specifically a distance from the axis of rotation. The side regions also have a second distance from each other, specifically a distance from the axis of rotation. The first distance is spaced apart from the second distance in the radial direction relative to the axis of rotation.

[0019] It can be advantageous for the receiving unit to have a receiving projection, particularly located on the side and extending circumferentially to the axis of rotation, for a positive-locking connection with a cutting unit. This projection is not a straight rib, but a shaped rib, typically arranged on one of the angled side surfaces of the receiving recess, and forms a positive-locking connection with a complementarily shaped recess in the cutting unit. The receiving projection extends circumferentially. The receiving projection is oriented at an angle to the axis of rotation. The receiving projection, and in particular its extension, is neither parallel nor intersecting the axis of rotation and can describe a spiral or helical path.When the cutting unit is inserted axially, the angled guide of the mounting extension simultaneously forces the cutting unit into a defined end position. This creates a kind of "bayonet guide" that converts axial movement into radial and / or tangential positioning, actively pressing the cutting unit against the boundary areas or surfaces of the mounting recess. The mounting extension extends circumferentially to the axis of rotation and projects away from the side area. The mounting extension extends along the axis of rotation. The mounting extension extends at an angle to the axis of rotation. The mounting extension defines the boundaries of the recess. This allows for particularly easy and reliable retention of the cutting unit.

[0020] It can be advantageous for the raised section of the receiving recess to extend, particularly along its maximum extent, along the axis of rotation, to a maximum of 90%, particularly 80%, preferably 70%, preferably 60%, particularly preferably 50%, and / or to a minimum of 20%, particularly 30%, preferably 40%, preferably 50%, particularly preferably 60%, and more preferably 70%. The raised section preferably does not extend over the entire axial extent of the receiving recess, thereby creating a free area at an end opposite the end face, particularly at the second end of the recess. The raised section extends to and adjoins the end face. This allows the cutting unit to be held not along its entire length, but only in the area relevant to the acting forces.

[0021] It may be advantageous for the receiving unit to have a further receiving recess, particularly one facing away from the receiving recess. This further receiving recess is identical to the first receiving recess. The receiving recesses are symmetrical, particularly rotationally symmetrical. The receiving recesses point away from each other. The receiving recesses are arranged on opposite sides. The receiving recesses are arranged circumferentially about the axis of rotation rotated approximately 180° relative to each other, particularly point-symmetrical about the axis of rotation. This symmetrical arrangement of two cutting units enables use with smaller tool diameters, for example, less than 15 mm, which is not possible with many prior art systems.

[0022] It may be advantageous for the receiving unit to have a wall element that separates the two receiving recesses. The wall element defines the receiving recess transversely to the axis of rotation. The wall element is positioned between the receiving recesses. The wall element is positioned between the two recesses and separates them from each other. The cutting units are arranged symmetrically.

[0023] The receiving unit has a, in particular cylindrical, opening element for receiving a threaded unit. The opening element is arranged approximately centrally at the receiving recess along and / or around the axis of rotation. The opening element connects both receiving recesses. The opening element extends through the entire wall element. The opening element intersects the axis of rotation. The opening element extends transversely, in particular perpendicularly, to the axis of rotation. The opening element has a central axis that intersects the axis of rotation and / or extends parallel to the further side region. The opening element is circular in cross-section. The opening element has a diameter that is larger than the maximum diameter around a longitudinal axis of the threaded unit.

[0024] It can be advantageous for the device to have an undercut element, particularly located in the receiving recess, which is radially internal, specifically situated substantially between the receiving embrasure and the axis of rotation. The undercut element can define the boundaries of the receiving embrasure. The undercut element is designed as a type of shaping that is radially internal, i.e., located within the depth of the receiving recess and / or preferably closer to the axis of rotation. By arranging the undercut element "substantially between the receiving embrasure and the axis of rotation," the undercut element abuts the inner end / side of the receiving embrasure. The undercut element can, for example, be designed as a groove, a step, or a recess that directly adjoins the receiving embrasure and / or defines its inner boundaries.The undercut element can have an undercut surface which is, in particular, recessed relative to the side surface of the side area. Unlike the side surface, the undercut element is preferably not designed to support the cutting unit, but is preferably spaced apart from it. The undercut element can be arranged, particularly in the radial direction to the axis of rotation, between two side surface sections that define a support for the cutting unit. The side surface sections can be parallel to each other. The side surface sections can extend along a side surface plane. The undercut element can be arranged between a side surface section and the receiving area and be bounded by them. The undercut element allows for easy removal of the cutting device and separation of the working surfaces between the receiving area and the cutting unit.

[0025] It may be advantageous for the receiving unit to have a stop element to limit the insertion of the cutting unit, particularly along the axis of rotation. The stop element ensures axial positioning of the cutting unit. It is typically designed as a physical barrier (e.g., in the form of a shoulder, a step, or the bottom of the receiving recess) that limits the insertion movement of the cutting unit at a precisely defined point. When the cutting unit encounters this stop element, an end position is defined. The stop element is designed to absorb axial cutting forces during operation. The stop element limits the recess along the axis of rotation, particularly between the first and second ends of the receiving unit. The stop element has a flat stop surface. The stop surface may extend transversely, particularly perpendicularly, to the axis of rotation.The stop element can be formed by a stop recess. The stop recess can extend circumferentially around the longitudinal axis and, in particular, define a lateral region. Viewed along the axis of rotation, the stop element is located below the receiving ridge. The stop element is positioned on the lateral region. The stop element defines a receiving area for the cutting unit. This advantageously predefines an end position for the cutting unit. This enables automatic positioning of the cutting unit in both radial and axial directions without the need for manual fine-tuning.

[0026] It can be advantageous for the cutting device to include a holding unit for securing the cutting unit to the receiving unit. The holding unit is the clamping component of the cutting device, particularly its active function, whose specific task is to fix the cutting unit inserted into the receiving unit and to establish a connection, especially one free of play, during operation. While the receiving unit, through its shape, positions and secures the cutting unit, the holding unit generates the clamping or holding force. It functions as a movable element that, typically by actuating a threaded unit, is moved in a controlled manner against the cutting unit to press it with high force against the reference and support surfaces of the receiving unit.The holding unit, viewed circumferentially around the axis of rotation, is smaller than the receiving recess of the receiving unit in a receiving state and / or a holding state. The holding unit can be received laterally, i.e., transversely to the axis of rotation, in the receiving recess. In this context, a holding state can also refer to a clamping state.

[0027] It can be advantageous for the cutting device to have a threaded unit for connecting the receiving unit, the cutting unit, and / or the holding unit. The threaded unit is designed to move the holding unit from an assembly state to a clamping state. Actuating the threaded unit moves the holding unit in a controlled manner to create the necessary clamping force. This allows for particularly easy and reliable holding of the holding unit.

[0028] The holding unit is designed to hold the cutting unit in the receiving recess by means of a threaded unit. The holding unit is positioned in a holding and / or a release state between the side section and the other side section. The holding unit is held in a holding / clamping state and / or a release state by means of the threaded unit in the receiving recess. This allows for a particularly simple separation of functions, thus ensuring optimal retention of the cutting unit.

[0029] It may be advantageous for the holding unit to have a holding element, particularly a beam-shaped one, for holding a cutting unit, especially on a receiving unit, in a force-fit manner. The holding unit can extend substantially along the entire longitudinal extent of the receiving recess. The holding element is designed as a holding body. Such elements are often referred to as wedges that are pulled in by screws. In contrast, the present holding unit is pressed outwards by the threaded unit in an expanding motion. The holding unit is elongated and extends along a longitudinal axis of the holding unit. The holding unit has a holding area, particularly one associated with the receiving unit. The holding area is designed as a holding surface, particularly a flat one.The holding area, particularly in a holding state, is designed parallel to the side of the receiving unit. The holding area, and in particular a transverse extension thereof, is aligned parallel to, in particular a central axis, of the holding recess. The holding area, particularly in a connected state, is designed to form a force-fit connection with a cutting unit, particularly one associated with the side. The holding area, particularly in a released state, is designed to guide the holding unit along a cutting unit, particularly one associated with the side. The holding area is movably mounted transversely, and in particular perpendicularly, to the axis of rotation relative to the cutting unit. This allows for a particularly simple and reliable guidance function.

[0030] It may be advantageous for the holding unit to be further away from the axis of rotation in a holding / tensioning state than in a released state.

[0031] In the released state, the holding unit is positioned in an inner location, closer to the axis of rotation, to facilitate the insertion or removal of the cutting unit. During the transition to the clamped state, the holding unit is moved radially outward. This radial outward movement constitutes the actual clamping stroke. As it does so, the holding area of ​​the unit presses against the cutting unit with increasing force, firmly penetrating it into the undercut, wedge-shaped receiving recess or the side area. The holding unit thus functions as a radially expanding wedge.

[0032] In a holding state, the holding unit rests against the cutting unit and / or against the other side surface of the receiving recess. In a holding state, the holding unit is clamped against the cutting unit. In a holding state, a holding force acts radially to and circumferentially around the axis of rotation against the cutting unit. In a holding state, the holding unit is arranged in the receiving recess. In a holding state, the holding unit is clamped radially to the axis of rotation against a side region and / or cutting unit arranged transversely to a radial plane. In a receiving state, the holding unit is spaced, particularly circumferentially, from the side region, the cutting unit, and / or the other side region. In a receiving state, the holding unit is arranged radially recessed inwards.In a receiving state, the holding unit defines a receiving space between the side area and the holding unit. This receiving space is designed to receive a cutting unit. In a receiving state, the cutting unit is movably mounted within the receiving space, particularly along the receiving ridge. Typically, the cutting unit is not clamped in a receiving state; therefore, the receiving unit is in a released state.

[0033] The holding unit can be movably mounted in the radial direction relative to the axis of rotation by means of a threaded assembly. The holding unit can be clamped against a substantially wedge-shaped receiving recess in a holding position. The holding unit moves from a released position to a held position in the radial direction towards the axis of rotation. The holding unit moves from a held position to a released position in the radial direction away from the axis of rotation.

[0034] This allows a holding force to be applied to the holding element in a particularly simple and reliable manner. Specifically, the holding force can be reduced in an operating state due to centrifugal forces acting on the holding unit. This relieves stress on the holding unit and also enables particularly safe handling of the cutting device, as the cutting unit is reliably held by the holding unit in every operating state. Additionally, the centrifugal force acting on the holding unit supports the clamping effect, as it also pushes the holding unit away from the axis of rotation, thus maintaining or even increasing the holding force on the cutting unit. This constitutes a self-locking system.

[0035] It can be advantageous for the holding unit to have a longitudinal extent that is at least 400%, in particular 500%, preferably 600%, and / or at most 900%, in particular 800%, preferably 700%, greater than its transverse extent. This geometry of a beam- or strip-shaped component makes it possible to distribute the clamping force over the longest possible contact line to the cutting unit. This allows for a particularly compact cutting unit. Furthermore, the holding force can be distributed over a larger area.

[0036] It can be advantageous for the holding unit to have a holding area, particularly one designed as a holding surface. The holding area is intended to exert force on the cutting unit. When the holding unit is actuated, the holding surface generates a clamping force through physical contact. The holding surface is flat. A flat surface enables full-surface, linear, or point-like contact and uniform pressure distribution. The holding surface extends along the longitudinal axis across the entire length of the holding unit. The holding area extends transversely to, in particular, a holding axis or the holding recess. The holding axis can also form an axis of movement. In a holding state, the holding area makes direct contact with the cutting unit.

[0037] The holding unit can be held to the receiving unit by means of the threaded unit. The holding unit can be held, in particular by means of a positive fit, preferably by means of the threaded unit along the axis of rotation.

[0038] It can be advantageous for the holding area to be arranged in both a released and a held state, particularly completely on the receiving unit, especially within the receiving recess. The holding unit remains attached to the receiving unit in both the clamped and released states, preferably even within the boundaries of the receiving recess. This is typically achieved by permanently and movably connecting the holding unit to the receiving unit via the threaded unit. For the user, this means that no small parts can be lost when changing the cutting unit. The holding area is arranged parallel to the side of the receiving unit in both a released and a held state. The holding area can also be arranged transversely to a radial plane of the receiving unit's axis of rotation in both a held and a connected state.The holding area forms a force-fit connection, particularly opposite the cutting unit, preferably a sub-area of ​​the cutting unit, to hold the cutting unit on the receiving unit.

[0039] It can be advantageous for the holding unit to have a retaining recess, particularly one extending along a retaining axis, for receiving a threaded unit. The retaining recess is a through-pass or guide element within the holding unit that serves to receive and interact with the threaded unit. It typically extends as a bore or channel along a retaining axis through the body of the holding unit. Rotating the threaded unit causes the holding unit to move translationally due to the thread engagement. The retaining recess is preferably arranged in line with, particularly along a central axis, the through-pass element. The retaining recess is designed as an (internal) thread. The retaining recess has internal surfaces and / or is bounded by them, which are designed as threaded surfaces.The retaining recess, particularly by means of a threaded unit, is designed to hold the retaining unit and / or the cutting unit on the receiving unit. The retaining recess extends through the entire thickness of the retaining unit. It is positioned approximately centrally along the longitudinal and / or transverse axis, thus ensuring a uniform distribution of forces. The retaining axis and the central axis essentially coincide. This ensures that the clamping force generated by the threaded unit is introduced centrally into the component, minimizing undesirable tilting moments or uneven deformation. This guarantees a stable and secure connection between the components.

[0040] It may be advantageous for the retaining recess to be designed as a through-hole extending through the entire retaining unit. The retaining recess extends from one end of the retaining unit to the other and allows the use of a through-threaded component, in particular a clamping screw, accessible from a side opposite the axis of rotation. The through-hole extends between the retaining areas. It may be advantageous for the retaining recess to have an internal thread. It may be advantageous for the retaining recess to be positioned approximately centrally along a longitudinal and / or transverse axis of the retaining unit.

[0041] It may be advantageous for the holding unit to have a further holding area, in particular designed as an additional holding surface. This further holding area is arranged facing away from the primary holding area. The further holding area is angled relative to the primary holding area, particularly when viewed along the transverse axis, in particular at an angle of at least 1°, in particular 2°, preferably 3°, more preferably 4°, more preferably 5°, more preferably 6°, and / or at most 15°, in particular 12°, more preferably 10°, more preferably 9°, more preferably 8°, more preferably 7°. In addition to the primary holding area that clamps the cutting unit, there is a further holding area facing away from it, i.e., arranged on the opposite side of the holding unit. These two surfaces are not parallel to each other, but are at a specifically defined acute angle to each other.This angle gives the holding unit its characteristic wedge shape in cross-section. While the holding area (the holding surface) presses against the cutting unit, the further holding area is supported by a corresponding further side surface within the receiving recess. The further holding area is designed as a holding surface, in particular a flat one. The further holding area is, in particular in a connected state, parallel to the further lower section of the cutting unit. The further holding area, in particular a transverse extension thereof, is parallel to, in particular a central axis, of the holding recess. The further holding area is designed to form a force-fit connection with, in particular a lower section, of the cutting unit. The further holding area is parallel to an axis of movement of the holding unit. The further holding area is smaller than the holding area when viewed along its transverse extension.The further holding area forms a force-fit connection, particularly in relation to the receiving unit, preferably to the further side area of ​​the receiving unit, to hold the cutting unit on the receiving unit.

[0042] It can be advantageous for the holding surface to be larger than the other holding surface. A larger holding surface on the side of the cutting unit allows for a wider and more even distribution of the contact pressure on the cutting unit, which is often made of brittle carbide. The holding unit is asymmetrically designed.

[0043] It can be advantageous for the cutting device to have a holding unit and a further holding unit, particularly one located away from the first holding unit. The introduction of a "further holding unit," typically arranged diametrically opposite the first holding unit, allows for the simultaneous clamping of two cutting units, resulting in a perfectly balanced tool. It can be advantageous for the further holding unit and the first holding unit to be connected in a loose state, particularly by means of a threaded connection. It can be advantageous for the two holding units to be connectable and / or adjustable relative to each other, particularly by means of a threaded connection. It can be advantageous for the holding units to be spaced further apart from each other in a held state than in a loose state, particularly by means of a threaded connection.

[0044] It can be advantageous for the cutting device to have a threaded unit. This threaded unit holds the holding units together in a loosened position and apart in a clamped position. The two holding units are adjustable by means of a single, continuous threaded unit. This is often achieved by a clamping screw with opposing threads at its two ends (one right-hand and one left-hand thread). Each holding unit has the corresponding internal thread. When this central clamping screw is turned, the opposing threads cause both holding units to move simultaneously and symmetrically – either towards each other (loosening) or away from each other (tightening). This synchronous spreading movement presses both holding units outwards at the same time. The threaded unit is elongated and, in particular, bolt-shaped. In an operating position, the threaded unit is positioned between the receiving recess and the next receiving recess.The threaded unit has a threaded element, in particular one that delimits the threaded unit. The threaded unit has a further threaded element, in particular one that delimits the threaded unit. The threaded element and the further threaded element are arranged at opposite ends of the connecting element. The threaded element is a left-hand thread, in particular a left-hand thread. The further threaded element is a right-hand thread, in particular a right-hand thread. Both threaded elements have different directions of insertion. Both threaded elements may have the same pitch. The threaded unit has a rotational area for receiving a wrench, in particular an Allen wrench, to allow the threaded unit to be rotated, in particular about an axis of rotation. The rotational area is designed as a socket, in particular an internal socket, preferably an internal hexagon socket.The rotation area is surrounded by the threaded element, particularly in a plane around 360°.

[0045] It can be advantageous for the threaded unit to be arranged in a holding and a releasing state on the receiving unit, in particular the receiving recess, preferably in the holding recess. In contrast to systems where a screw must be completely removed for clamping, the present threaded unit is captive and mounted in the receiving unit and / or the holding unit. This can be achieved by the threaded unit being rotatable but axially fixed in a bore of the receiving unit (e.g., by a head and a retaining ring). The threaded unit has a central section which is arranged between the threaded elements and, in particular, is bounded by them. The central section, in particular a diameter, is radially smaller than the threaded element(s), in particular a diameter of the threaded element.

[0046] The cutting unit is planar and extends along a longitudinal axis. It is plate-like, particularly plate-like. The cutting unit is the actual, active tool element. It is typically formed from a plate or a small body made of a hard and wear-resistant material, such as carbide or ceramic. Its geometry, the sharpness of its cutting edges, and its positioning significantly determine the quality of the produced surface, the dimensional accuracy of the workpiece, and the efficiency of the entire process. In one cut, the cutting unit is essentially rectangular or parallelogram-shaped. In another cut, the cutting unit is trapezoidal. The cutting unit is designed as a cutting plate.In contrast to many cutting inserts of the prior art, the cutting unit according to the invention has no through holes or vertical grooves, which increases its mechanical resistance. The cutting unit is designed to be arranged on a receiving unit, in particular a receiving recess, preferably a side region. The cutting unit has a lower region and an upper region facing away from the lower region. The "upper region" is the rake face over which the chip runs, and the "lower region" is the clearance face facing the workpiece. The lower region is parallel to the upper region. The lower region has an extent that is greater than the extent of the upper region. This means that the cutting unit has a trapezoidal cross-section.This geometry easily creates a positive clearance angle at the lateral cutting edges to minimize friction between the tool and the workpiece. The lower section has a flat underside. The upper section has a flat surface. The surfaces are parallel to each other and define the thickness of the cutting unit. The upper section may have an additional surface spaced apart from the main surface.

[0047] It can be advantageous for the cutting unit to have a circumferential region, in particular a circumferential surface. The circumferential region is arranged between and / or bounded by the upper region and the lower region. The "circumferential region" represents the lateral surface of the cutting insert. The main cutting edge is typically formed at the interface between it and the lower region. The circumferential region is angled relative to the lower region and / or the upper region. The circumferential region is angled relative to the lower region, in particular at an angle of at least 15°, in particular 20°, preferably 25°, more preferably 30°, more preferably 35°, and at most 50°, in particular 45°, more preferably 40°, more preferably 35°. The circumferential region forms an acute angle, i.e., an angle less than 90°, with the lower region or the lower surface. The circumferential surface forms an obtuse angle, i.e., an angle greater than 90°, with the upper region or the surface.The circumferential surface is designed as a free surface of a cutting unit.

[0048] The cutting unit comprises a cutting element. The cutting element extends along the longitudinal axis. The cutting element extends parallel to the longitudinal axis. The cutting element is the primary functional edge of the cutting unit. It is designed as a sharply ground edge formed by the intersection of two precisely machined surfaces (typically the rake face and the flank face). The longitudinal extent is crucial for machining, as it determines the maximum possible depth of cut or width of cut. The cutting element defines the boundaries of the cutting unit. The cutting element has a cutting edge. The cutting edge defines the bottom surface and the circumferential surface. The cutting element defines the circumferential surface in the direction along the longitudinal axis. Both surfaces terminate in the cutting edge.

[0049] It can be advantageous for the cutting unit to have a transverse cutting element. The transverse cutting element is arranged perpendicular to, and in particular at an angle of less than 90° to, the cutting element. The "transverse cutting element" is another sharp edge that does not run parallel to, but rather perpendicular to, the main cutting element and limits its end. At the point where the main cutting element and this transverse cutting element meet, they form a "cutting corner." This cutting corner is the most active and most heavily stressed part of the tool. The transverse cutting element itself acts as the bottom cutting edge. The transverse cutting element limits the cutting element.The transverse cutting element together with the cutting element forms a cutting angle which forms an angle of at least 1°, in particular 2°, preferably 3°, preferably 4°, particularly preferably 5°, further preferably 6°, and / or at most 15°, in particular 12°, preferably 10°, preferably 9°, particularly preferably 8°, further preferably 7°.

[0050] The cutting unit features a further cutting element, designed analogously to the first. This second cutting element is arranged parallel to the first and extends along the side of the cutting unit facing away from the first. This exact duplication of the cutting geometry at symmetrically opposite positions enables it to function as an indexable insert. When the first cutting edge is worn, the insert can be rotated to bring the second, unused cutting edge into the working position.

[0051] It can be advantageous for the cutting unit to have a cutting recess for retention on the receiving unit. The cutting recess is the geometric feature that serves as a counterpart or negative form to the positioning and retention elements of the receiving unit. It is a groove, pocket, or recess whose sole function is to establish a mechanical connection with the receiving unit. This precise positive fit ensures that the cutting unit is positioned and secured accurately. The cutting recess is oriented transversely to the longitudinal axis of the cutting unit and / or the cutting element. The cutting recess is located on the upper surface. The cutting recess extends from one side of the cutting unit to the opposite side.

[0052] It can be advantageous for the cutting recess to be angled relative to the cutting element, in particular at an angle of at least 1°, in particular 2°, preferably 3°, more preferably 4°, more preferably 5°, more preferably 6°, and / or at most 15°, in particular 12°, more preferably 10°, more preferably 9°, more preferably 8°, more preferably 7°. This angle is the geometric counterpart to the "skew" raised section in the receiving unit. When the cutting unit is inserted axially, this angle ensures that the cutting unit performs a slight rotational or tilting movement, which actively presses it against the support surfaces. This results in a "pulling cut," which reduces cutting forces and improves the surface finish. It can also be advantageous for the cutting recess to have point symmetry with respect to a longitudinal axis of the cutting unit.The cutting recess is designed as a positive-locking element for a positive connection with the mounting unit. The cutting recess is symmetrical on the cutting unit and / or exhibits point symmetry with respect to its longitudinal axis. This point symmetry means that the cutting unit has two or even four identical mounting geometries. If a cutting edge becomes worn, the user can simply rotate the plate 180 degrees and reinsert it, thus utilizing a new, unused cutting edge. This doubles or quadruples the service life. As a result, the cutting unit can be designed without any through-holes, providing a particularly stable and robust cutting unit.

[0053] It may be advantageous for the cutting recess to have a depth that is at least 20%, particularly 25%, preferably 30%, preferably 35%, and / or at most 55%, particularly 50%, preferably 45%, preferably 40%, relative to the thickness / strength of the cutting unit. This relative size ratio is a compromise between secure fastening and stability. A sufficiently deep recess is necessary for a robust positive fit. At the same time, the recess must not be too deep, as this would weaken the cross-section of the cutting unit. The defined percentage ratio represents a carefully considered technical compromise.

[0054] The cutting unit has a parallelogram shape in a cross-section. The cutting element projects along the longitudinal axis. The cutting element is free-floating. The cutting element is offset from the other cutting element along the longitudinal axis. The cutting unit includes a transverse cutting element. The transverse cutting element adjoins the cutting element. The transverse cutting element forms a cutting edge with the cutting element. The transverse cutting element is positioned between and bounded by the cutting elements. The transverse cutting element forms an acute angle with the cutting element and an obtuse angle with the other cutting element. The cutting element is parallel to the other cutting element, and the transverse cutting element is parallel to the other transverse cutting element.

[0055] This allows for particularly simple and reliable cutting into the workpiece. It can be advantageous for the cutting element and the cross-cutting element to be formed by the lower area, especially the underside, and the circumferential area, especially the circumferential surface. The cutting edge is always physically the intersection of two surfaces. This specification defines the classic geometry of a so-called negative cutting insert, in which the underside serves as the primary clearance surface and the lateral circumferential surface as the secondary clearance surface. The cutting elements (cutting elements and cross-cutting elements) delimit the lower area, especially the underside. The cutting unit, especially the cutting element and / or the cross-cutting element, protrudes from the holding unit in an operating state, especially along and / or perpendicular to the axis of rotation.

[0056] It may be advantageous for the cutting device to have a locking unit to secure the cutting unit against falling out, particularly unintentionally. The locking unit can be designed such that the cutting unit can only be removed from a single direction. The receiving unit can be designed to block lateral removal, particularly removal perpendicular to the axis of rotation. When the holding unit is released, the cutting unit (30) can preferably be removed from the receiving device (receiving unit) from one direction, preferably along and transverse to the axis of rotation. The cutting unit, in particular the cutting recess, can be guided along the receiving unit, in particular the receiving ridge, and / or allow the cutting unit to be inserted into and / or removed from the receiving unit.The locking mechanism is a comprehensive concept resulting from the intelligent interplay of several geometric features. Its function is to prevent unintentional release and dislodgement. Even if the primary clamping force diminishes, the specific geometries (such as the radially expanding receiving recess and the skew receiving ridge) ensure that the cutting unit cannot simply be ejected radially. Removal requires a deliberate, multi-stage movement, virtually eliminating the possibility of accidental release.

[0057] It may be advantageous for the receiving unit to have a receiving recess for receiving a cutting unit. It may also be advantageous for the receiving recess to increase radially in the direction of the axis of rotation.

[0058] It can be advantageous for the receiving recess to have a minimum extent on a radius around the axis of rotation, which is smaller than the maximum extent of the cutting unit and the holding unit on the same radius around the axis of rotation in a state arranged on or in the receiving recess, in particular a holding state and / or a release state. This ensures that the cutting unit does not unintentionally fall out of the receiving unit in a radial direction. The opening of the receiving recess is deliberately dimensioned narrower than the combined width of the cutting unit and the holding unit in the clamped state. During the clamping process, the assembly "spreads" and thus wedges itself in the opening, creating a redundant, purely geometric locking mechanism.

[0059] It can be advantageous for the receiving recess, viewed in a radial plane, to have a receiving recess area that is smaller adjacent to an end face of the receiving unit than at an area facing away from the end face. The "receiving protrusion" is usually located at the front end (near the end face) and projects into the receiving recess, thereby locally reducing its free cross-section. A cutting unit located in the rear, larger area is blocked by the front, smaller constriction and cannot be easily pulled out axially. The receiving recess area can be designed as a surface projected along the radial plane and bounded by the receiving unit. The receiving recess area and a further, spaced-apart receiving recess area can be of different sizes.In particular, the intake recess area may be smaller due to the increased intake height than the additional intake recess area.

[0060] It can be advantageous for the cutting unit to have a recess for a positive-locking connection with the receiving unit. This diagonal recess allows for easy insertion of the cutting unit without the cutting edge scraping or being damaged against the receiving unit, as it is only brought into its final position at the end of the insertion movement. At the same time, this ensures that the cutting unit, and in particular the cutting element, maintains a largely uniform distance from the axis of rotation, as the direction and final position are "predefined."

[0061] It may be advantageous for the cutting unit to have a sub-area, in particular a sub-surface, for a force-fit connection with the holding unit.

[0062] It may be advantageous for the receiving unit to have a raised section for a positive-locking connection with the cutting unit. It may also be advantageous for the raised section to be smaller than a certain, and especially a maximum, circumferential distance between the receiving unit and the holding unit, particularly in any given state. This dimensional relationship is key to the "threading" process: it provides the necessary maneuvering space to insert the rigid assembly of cutting and holding units into the receiving recess by means of a slight tilting or pivoting motion past the rigid raised section.

[0063] It may be advantageous for the receiving unit to have a receiving recess which is bounded by the receiving elevation. It may also be advantageous for the receiving elevation to have an extension along the longitudinal axis which, compared to an extension of the recess along the axis of rotation, is in particular at least 10%, preferably 20%, more preferably 30%, further preferably 40%, particularly preferably 50%, and / or at most 70%, preferably 60%, more preferably 50%, more preferably 40%.

[0064] It can be advantageous for the raised section, viewed along the axis of rotation, to connect to the end face. This positioning ensures that the cutting unit is immediately engaged by the guide upon insertion. It prevents accidental forward slippage, as the cutting unit is always locked in place by the positive fit with the raised section.

[0065] It may be advantageous for the receiving unit to have a raised section for a positive-locking connection with the cutting unit. It may be advantageous for the raised section to be smaller than a certain, particularly maximum, circumferential distance between the receiving unit and the holding unit. This applies in all conditions.

[0066] It may be advantageous for the cutting device, in particular milling device, to have a cutting unit for cutting a workpiece, a receiving unit for receiving the cutting unit and a holding unit for holding the cutting unit on the receiving unit.

[0067] It can be advantageous for the cutting device to have a clamping unit for clamping the cutting unit to the mounting unit. The clamping unit is a functional system that actively "clamps" the cutting unit, that is, it transforms it from a loosely inserted mounting state into a play-free operating state. It generates the necessary clamping force through frictional engagement.

[0068] It may be advantageous for the holding unit to have a holding area for a force-fit connection with the cutting unit.

[0069] It may be advantageous for the holding area to be designed as a flat holding surface. It may be advantageous for the holding area to extend along the longitudinal axis of the holding unit over its entire length. The holding area delimits the holding unit. The holding area is flat. The holding area forms its own holding plane. The holding plane may intersect the axis of movement.

[0070] It can be advantageous for the cutting unit to be tensioned by a clamping direction pointing away from the axis of rotation. The force acting on the cutting unit comes from the side of the axis of rotation.

[0071] This mechanism is ingenious because the primary clamping force pushes the cutting unit radially outwards, wedging it into the V-shaped flanks of the receiving recess. The centrifugal forces generated during rotation also act radially outwards, thus increasing the clamping pressure instead of working against it. This reduces stress during operation of the cutting device.

[0072] It can be advantageous for the cutting unit to have a recess for a positive-locking connection with the receiving unit. This allows for a fixed positioning of the cutting unit. This positive-locking connection not only serves as a locking mechanism but also acts as a high-precision guidance system that dictates the exact and repeatable position of the cutting unit in all three dimensions.

[0073] It may be advantageous for the receiving unit to have a raised section for a positive-locking connection with the cutting unit. It may be advantageous for the raised section to be smaller than a certain, particularly maximum, circumferential distance between the receiving unit and the holding unit. This applies in all conditions.

[0074] It can be advantageous for the cutting device to have an additional holding unit for securing another cutting unit to the mounting unit. It can be advantageous for the additional holding unit to be located on the opposite side of the mounting unit from the first holding unit. This typically results in a diametrically opposed placement, offset by 180 degrees. Such a symmetrical configuration with two cutting units leads to optimal dynamic balancing of the entire milling body, enabling higher rotational speeds, reduced vibration, and improved surface finish.

[0075] It can be advantageous for the cutting device to have a threaded unit, particularly one arranged between the holding units, which clamps the holding units away from each other in a clamping position. Actuation of the threaded unit generates an expanding movement. The mechanism pushes the two wedge-shaped holding units radially outwards simultaneously and with nearly the same force, thereby initiating a symmetrical clamping process for two cutting inserts.

[0076] It can be advantageous for the threaded unit to have one threaded element and another threaded element. It can also be advantageous for the threaded elements to be opposite to each other, with one threaded element being right-handed and the other left-handed. This design of a turnbuckle or counter-rotating threaded spindle makes it possible to generate a symmetrical and counter-rotating linear motion of two components with a single, simple rotary motion.

[0077] It can be advantageous for the receiving unit to have a stop element, particularly one extending transversely to the axis of rotation, that acts as an axial stop. This stop element serves as a physical barrier and defines the exact and final position of the cutting unit in the axial direction. It ensures repeatability and absorbs axial cutting forces during operation.

[0078] It can be advantageous for the receiving unit to have a stop element, particularly one extending along the axis of rotation, against a radial stop. This element, typically one of the inner walls of the receiving recess, defines the position of the cutting unit in the radial direction and thus the exact diameter of the tool. It also serves as a solid support against radial cutting forces.

[0079] The present invention particularly advantageously provides a safety system that prevents the cutting unit from falling out, especially unintentionally, particularly during operation. This reduces the risk of injury, for example, even with loosely tightened threaded units.

[0080] The present invention makes it particularly advantageous to provide a self-reinforcing holding system, whereby the cutting unit can be clamped by means of the holding unit by means of centrifugal force on the one hand, and the connecting unit can be relieved by centrifugal forces acting opposite to the connecting effect on the other hand.

[0081] The present invention makes it particularly advantageous to provide a coupled clamping system, thereby enabling the clamping of two holding units using a single-sided threaded unit to be both time-saving and efficient. At the same time, the threaded unit is relieved of the centrifugal force acting on it during operation, as the centrifugal force acts in the direction of the clamping force and not against it.

[0082] The present invention makes it particularly advantageous to provide a coupled clamping system whereby, in an operating state, a compressive load acts on the threaded unit and not a tensile load.

[0083] The present invention allows for the particularly advantageous provision of a coupled clamping system, whereby the retaining elements remain attached to the mounting device in the released state and thus remain securely attached to the mounting unit even when the cutting unit is changed. This represents a significant improvement over prior art systems in which screws and wedges must be completely removed and can easily be lost.

[0084] The present invention makes it particularly advantageous to provide an axial removal system, which enables a particularly reliable and preferably simultaneous removal of the cutting units and also a particularly advantageous intake limitation by means of a stop. Brief description of the drawings

[0085] Further advantages arise from the following description of the drawings. The drawings may depict further developments of the invention. The drawings, the description, and the claims contain numerous features in combination. The person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations. This shows: Fig. 1 a perspective view of a cutting device according to the invention with the corresponding components, Fig. 2 Three further perspective views of a cutting device in different states in which a cutting unit is used, Fig. 3 Three further perspective views of a cutting device in different states, in which the cutting unit is shown from a release state to a holding state, Fig. 4 a cut through the cutting device and through the corresponding components, Fig. 5 two side views of the cutting unit, Fig. 6 three sectional views of the cutting unit, Fig. 7 four views of a recording unit, Fig. 8 two views of a threaded unit and Fig. 9 Two views of a holding unit.

[0086] In the following figures, identical components are labelled with the same reference symbols.

[0087] Fig. Figure 1 shows a perspective view of a cutting device 10. This device is designed as a milling tool for machining a workpiece and is rotatably driven about a rotational axis 11. The cutting device 10 comprises a mounting unit 20, a replaceable and reusable cutting unit 30 that can be inserted into the mounting unit 20, and a holding unit 40 for holding the cutting unit 30. A threaded unit 50 serves to actuate the holding unit 40. The mounting unit 20, which extends along a longitudinal axis 12 of the cutting unit 30 that coincides with the rotational axis 11, has a connection area 21 for detachable connection to a mobile hand-held power tool or a stationary machine tool and a working area 22. A receiving recess 23 for receiving the cutting unit 30 and the holding unit 40 is formed in the working area 22.In its installed state, the cutting unit 30 is positioned perpendicular to and along the axis of rotation 11 opposite the receiving unit 20.

[0088] Fig. Figure 2 shows three perspective views (a), (b), and (c) of the cutting device 10 during the insertion of a cutting unit 30. In state (a), the cutting unit 30 is inserted axially in the direction of the axis of rotation 11 into the receiving recess 23. State (b) shows the cutting unit 30 inserted further, with a cutting recess 33 of the cutting unit 30 engaging in a positive-locking engagement with a receiving protrusion 24 formed on the receiving unit 20 and arranged at an angle to the axis of rotation 11. State (c) shows the cutting unit 30 in its fully inserted end position, in which it rests against an axial stop element 27 of the receiving unit 20. This stop element 27 serves as a positioning aid and limits the insertion of the cutting unit 30 along the axis of rotation 11.

[0089] Fig. Figure 3 shows three perspective views (a), (b), and (c) of the cutting device 10 during the transition from a released state to a held state. In state (a), the cutting unit 30 is loosely located in a receiving space within the receiving recess 23. The holding unit 40 is arranged in a radially inner position, allowing the cutting unit 30 to be movably mounted along the receiving extension 24. By actuating the threaded unit 50, as indicated in state (b), the holding unit 40 is moved along a movement axis 45 essentially axially along the axis of rotation 11 and partially radially outward, i.e., away from the axis of rotation 11. In state (c), the held or clamped state is reached. Here, the holding unit 40 is further away from the axis of rotation 11 than in the released state and presses with its holding area 41 forcefully against a sub-area 31 of the cutting unit 30.This clamps the cutting unit 30 against a side region 25 of the receiving recess 23. The clamping direction 101 points away from the axis of rotation 11, with the force 101 acting on the cutting unit coming from the side of the axis of rotation, see state (c).

[0090] Fig. Figure 4 shows a section through the cutting device 10. The receiving unit 20 has two diametrically opposed, rotationally symmetrical receiving recesses 23 and 23', which are offset from each other by 180° and separated by a wall element 29. A cutting unit 30, 30' and a holding unit 40, 40' are arranged in each receiving recess 23, 23'. The elongated, bolt-shaped threaded unit 50 extends through a cylindrical opening 210 in the wall element 29 and connects the two holding units 40, 40'. The threaded unit 50 has a first threaded element 51 (e.g., left-hand thread) and a further, opposite threaded element 52 (e.g., right-hand thread), each of which engages in a holding recess 42 of the holding units 40, 40' designed as an internal thread. By rotating the threaded unit 50, the holding units 40, 40' are clamped symmetrically away from each other.Each holding unit 40 has a holding area 41 that presses against the cutting unit 30, and a further holding area 44 that is supported on the further side area 26 of the receiving recess 23. The entire arrangement forms a clamping unit and a locking system that prevents the cutting unit 30 from falling out.

[0091] Fig. Figure 5 shows two views of the plate-like cutting unit 30. This extends along a longitudinal axis 39 and has a lower region 31 with a flat underside 311 (clamping surface) and an upper region 32 facing away from the lower region 31. View (a) shows the parallelogram-like shape of the cutting unit 30 in a top view of the upper region 32. A cutting recess 33 is formed in this upper region, serving as a positive locking element. It extends transversely to the cutting element, runs at an angle of approximately 5° to the cutting element 34 or the longitudinal axis, and exhibits point symmetry with respect to the longitudinal axis 39. The cutting unit 30 is bounded by a cutting element 34 and another parallel and axially offset cutting element 34'. Between the cutting elements 34, 34', transverse cutting elements 35, 35' are arranged, which together with the cutting elements 34, 34' form cutting corners 38 at an angle of approximately 6°. View (b) shows a side view.A circumferential area 36, ​​serving as a free surface, is arranged between the lower area 31 and the upper area 32 and forms an acute angle of approximately 35° with the lower surface 311. The cutting elements 34, 35 and the transverse cutting elements are formed by the intersection of the lower surface 311 and the circumferential area 36.

[0092] Fig. Figure 6 shows three sectional views of the cutting unit 30. View (a), a section along line AA from Fig. 5(a) shows the trapezoidal shape of the cross-section, whereby the cutting element 34 is offset relative to the other cutting element 34' transversely to the longitudinal axis. View (b) shows a section along line BB from Fig. 5(a) shows the parallelogram-like formation, in which the extent of the lower region 31 is greater than that of the upper region 32. View (c) shows a section along line CC from Fig. Figure 5(a) shows the depth T of the cutting recess 33, which is approximately 35% of the total thickness of the cutting unit 30.

[0093] Fig. Figure 7 shows four views of the receiving unit 20. View (a) is a perspective view. The receiving recess 23 is bounded by the side region 25, the further side region 26, and the axial stop element 27. The receiving rise 24 is arranged on the side region 25. This extends over approximately 65% ​​of the length of the receiving recess 23, connects to the end region 28, and is smaller than the distance between the receiving unit 20 and the holding unit 40 in the released state, in order to allow insertion of the cutting unit. View (c) is a top view of the working area 22 and shows the essentially C-shaped shape of the receiving recess 23, which is bounded by a flat end region 28 perpendicular to the axis of rotation 11 and a curved circumferential region 280. View (d) is a section that illustrates the undercut, wedge-shaped geometry of the receiving recess 23. The side areas 25, 26 taper to a point at an angle of approximately...The cutting units are arranged at an angle of 6° to each other. Their projected extensions intersect at a point outside the tool body, thereby reducing the circumferential extent of the receiving recess 23 with increasing distance from the axis of rotation 11. This secures the cutting unit 30 against centrifugal forces.

[0094] Fig. Figure 8 shows two views of the threaded unit 50. This unit is bolt-shaped and has at its ends the first threaded element 51 (e.g., left-hand thread) and the second, opposite threaded element 52 (e.g., right-hand thread) with the same pitch. Between the threaded elements 51 and 52 is a central section 54 with a reduced diameter. At one end, a rotational area 53 is formed as an internal hexagon socket recess, which is surrounded by the threaded element 51. The threaded unit 50 is captive in all states within the receiving unit 20 and the holding units 40 and 40'.

[0095] Fig.Figure 9 shows two views of the holding unit 40. View (a) is a perspective view of a beam-shaped holding element 43, whose longitudinal extent is approximately 600% greater than its transverse extent. The holding unit 40 has a flat holding surface on the holding area 41 and a further holding surface on the opposite side of the holding area 44. The continuous holding recess 42 with internal thread extends between them. View (b) shows a cross-section in which the holding surface 41 and the further holding surface 44 are arranged at an angle of approximately 6° to each other, giving the holding unit 40 a wedge shape. The holding surface 41 is larger than the further holding surface 44. The holding unit 40 remains completely in the receiving recess 23 even when released.

Claims

[1] Holding unit (40) for a cutting device (10), in particular a milling device, with a holding area (41), in particular designed as a holding surface, for holding a cutting unit (30), in particular on a receiving unit (20), in particular by friction, and with a holding recess (42), in particular extending along an axis of movement (45), for receiving a threaded unit (50), characterized by , that the holding area (41) extends transversely to, in particular the axis of movement (45), the holding recess (42). [2] Holding unit (40) according to claim 1, characterized by , that the holding unit (40) is further apart from the axis of rotation (11) of the receiving unit (20) in a connected state (holding state) than in a released state. [3] Holding unit (40) according to any one of the preceding claims, characterized by, that the retaining recess (42) is arranged approximately in the middle of the retaining unit (40) when viewed along a longitudinal axis and / or a transverse axis. [4] Holding unit (40) according to any one of the preceding claims, characterized by that the holding unit (40) is arranged in a holding state and in a release state, in particular completely, on the receiving unit (20), preferably in the receiving recess (23) of the receiving unit (20). [5] Holding unit (40) according to any of the preceding claims, characterized by , that the holding area (41) is designed as a flat holding surface and extends along the longitudinal axis of the holding unit (40) over the entire extent of the holding unit (40). [6] Holding unit (40) according to any of the preceding claims, characterized bythat the holding unit (40) has a longitudinal extent which is greater than a transverse extent by at least 400%, in particular 500%, preferably 600%, and / or by at most 900%, in particular 800%, preferably 700%. [7] Holding unit (40) according to one of the preceding claims, characterized by a further holding area (44), in particular designed as a further holding surface, which is turned away from the holding area (41), wherein the further holding area (44) is angled relative to the holding area (41), in particular viewed along the transverse axis, in particular at an angle of at least 1°, in particular 2°, preferably 3°, preferably 4°, particularly preferably 5°, further preferably 6°, and / or at most 15°, in particular 12°, preferably 10°, preferably 9°, particularly preferably 8°, further preferably 7°. [8] Holding unit (40) according to any one of the preceding claims, characterized by, that the holding area (at holding area 41) is larger than the further holding area (at further holding area 44). [9] Holding unit (40) according to any of the preceding claims, characterized by , that the retaining recess (42) is designed as a through-recess which extends through the entire retaining unit (40), wherein the retaining recess (42) has an internal thread element. [10] Cutting device (10), in particular milling device, comprising a cutting unit (30) for cutting a workpiece, a receiving unit (20) for receiving the cutting unit (30) and a holding unit (40) for holding the cutting unit (30) on the receiving unit (20), characterized bya further holding unit (40') arranged, in particular facing away from the holding unit (40), wherein the further holding unit (40') and the holding unit (40) are connected in a loose state, in particular by means of a threaded unit (50), wherein the two holding units (40, 40') are adjustable relative to each other, in particular by means of a threaded unit (50). [11] Cutting device (10) according to claim 10, characterized by , that the threaded unit (50) is arranged in a holding state and in a release state on the receiving unit (20), in particular the receiving recess (23), preferably in the holding recess (42).

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