Cutting insert, tool holder, and tool for machining a workpiece

Abstract

The present invention relates to a cutting insert (10), a tool holder (60) and a tool (100) for machining a workpiece. The cutting insert (10) comprises an upper face (22); a circumferential face (24); a first cutting edge (14) formed at the transition between the upper face (22) and the circumferential face (24); a second cutting edge (16) formed at the transition between the upper face (22) and the circumferential face (24); a lower face (26) opposite the upper face (22) and designed 180° rotationally symmetrically with respect to a central axis (12) of the cutting insert (10); a first toothing (28) which is arranged on the lower face (26) and has a plurality of first teeth (34) which run parallel to one another along a longitudinal direction (38) of the cutting insert (10) which is oriented transversely with respect to the central axis (12) of the cutting insert (10); a second toothing (30) arranged on the lower face (26) and having a plurality of second teeth (36) that run parallel to one another along the longitudinal direction (38) of the cutting insert (10); and a groove that extends along a transverse direction (20) of the cutting insert (10), which is oriented transversely to the central axis (12) of the cutting insert (10) and transversely to the longitudinal direction (38) of the cutting insert (10), and spatially separates the first toothing (28) from the second toothing (30), a first contact surface (40) and a second contact surface (42) being arranged in the groove (32), which contact surfaces each extend in the transverse direction (20) of the cutting insert (10), are opposite each other in relation to the central axis (12) of the cutting insert (10) and are equidistant from the central axis (12) of the cutting insert (10).

Description

Cutting plate, tool holder and tool for machining a workpiece

[0001] The present invention relates to a cutting insert for a tool for machining a workpiece. The present invention further relates to a tool holder for a tool for machining a workpiece, wherein the tool holder serves in particular to hold at least one cutting insert according to the invention. The present invention also relates to a tool with at least one cutting insert according to the invention and / or a tool holder according to the invention.

[0002] The tool according to the invention is a cutting tool with at least one cutting insert, which is preferably detachably attached to a tool holder. Depending on the specific design, the tool according to the invention can be configured for different applications and thus in the form of a wide variety of cutting tools.

[0003] The tool according to the invention is, for example, a machining tool for gear skiving, a machining tool for gear shaping, a machining tool for profile turning, a machining tool for plunge turning, or a milling tool. A multitude of other types of machining tools in which the present invention is used are conceivable in principle, which is why the preceding list should not be considered exhaustive.

[0004] In cutting tools with replaceable or interchangeable inserts that are detachably mounted on a corresponding tool holder, the interface between the insert and the tool holder is of paramount technical importance. This interface, often referred to as the "insert seat," must always ensure a mechanically precise and secure fit of the insert to meet the very high precision requirements of such cutting tools. For example, the position of at least one cutting edge of the insert must be very precisely defined by fixing the insert to the tool holder and must fall within extremely tight tolerances. Furthermore, secure clamping of the insert must be guaranteed regardless of the cutting edge geometry and the clearance faces of the insert.Likewise, unambiguous repeatability, which ensures that after a wear-related replacement of a cutting insert, the newly mounted cutting insert is mounted on the tool holder in exactly the same way, is of utmost importance.

[0005] For such interfaces or insert seats, machining technology increasingly uses connection surfaces where male and female engagement elements interact. These interfaces most often feature a connection surface on the cutting insert equipped with such engagement elements, as well as a corresponding connection surface on the insert holder mounted on the toolholder. Some of these connection surfaces have serrations consisting of several straight, parallel teeth. These teeth typically have a V-shaped cross-section and engage with corresponding mating teeth.

[0006] An example of a tool with such a toothed insert seat is known from EP 2 845675 B1. Here, the toothing is provided on the underside of the cutting insert, which engages with a corresponding toothed section located on the top side of the insert holder on the toolholder. In addition to the toothing, further contact surfaces are provided on the cutting insert, which ensure that the cutting insert rests against the toolholder and is mechanically secured. In the aforementioned tool, these contact surfaces are located on the lateral circumferential surface of the cutting insert. However, such lateral contact surfaces must be ground into the clearance faces provided on the circumferential side of the cutting insert. Besides requiring an additional machining step in the manufacturing of the cutting insert, this also results in a weakening of the cutting insert.Furthermore, due to the angularity of the contact or clamping surfaces, even the smallest deviations can accumulate into large length variations. Another disadvantage of such a lateral mounting of the contact surfaces is that the design of the geometry of the clearance surfaces, and possibly also the design of the cutting edge geometry, is not independent of the geometry of the insert seat.

[0007] Such independence of the insert seat geometry from the geometry of the clearance faces and the cutting edges can be achieved, for example, if the insert seat geometry is arranged completely on the underside of the cutting insert, as is the case, for example, with the tools disclosed in EP 1 702 703 B1, EP 2 822 719 B1 and US 6,146,061 A.

[0008] In the tool known from EP 1 702 703 B1, instead of teeth, individual, transversely extending ribs are used. These ribs are arranged on the cutting insert holder and engage in corresponding transversely extending V-shaped grooves provided on the underside of the cutting insert. This achieves both a length stop and a rotational protection of the cutting insert.

[0009] Such connection surfaces provided on the underside of the cutting inserts are usually sintered in a raw state due to their complexity and therefore subject to larger tolerances. In the case of the tool known from EP 1 702 703 B1, the contact surfaces arranged in the V-shaped grooves are at an obtuse angle to each other, which leads to poor securing of the cutting insert to the tool holder, resulting in undesirable relative movements between the cutting insert and the tool holder. In particular, this creates a risk of the cutting insert tilting.

[0010] It is therefore an object of the present invention to provide a cutting plate, a tool holder and a tool with such a cutting plate and / or such a tool holder which solve the above-mentioned problems.

[0011] In particular, it is important to ensure a sufficiently stable insert seat that enables precise positioning of the cutting insert on the tool holder, ensures a sustainably secure clamping of the cutting insert, prevents the cutting insert from twisting relative to the tool holder, guarantees sufficiently good repeatability, and yet offers the greatest possible freedom in the design of the cutting edge-to-chipping surface geometry and the cutting edge-to-lift surface geometry.

[0012] According to a first aspect of the present invention, this problem is solved by a cutting plate which has the following features: - a top side; - a perimeter page; - a first cutting edge, which is formed at the transition between the top surface and the circumferential side; - a second cutting edge, which is designed at the transition between the top and the circumferential side; - a bottom surface that is opposite the top surface and is designed to be rotationally symmetrical 180° to a central axis of the cutting plate; - a first toothing arranged on the underside and having a plurality of first teeth parallel to each other along a longitudinal direction the cutting plate, which is aligned transversely to the central axis of the cutting plate; - a second set of teeth located on the underside, comprising a plurality of second teeth running parallel to each other along the longitudinal direction of the cutting insert; and - a groove running along a transverse direction of the cutting plate, which is oriented transversely to the central axis of the cutting plate and transversely to the longitudinal direction of the cutting plate, and spatially separating the first toothing from the second toothing, wherein a first contact surface and a second contact surface are arranged in the groove, each running in the transverse direction, opposite each other with respect to the central axis of the cutting plate and having an equal distance from the central axis of the cutting plate;wherein an imaginary center plane of the cutting plate, extending in the transverse direction of the cutting plate and along the central axis of the cutting plate, divides the groove into two equal halves, wherein the first cutting edge, the first toothing and the first bearing surface are arranged on a first side of the center plane of the cutting plate, and wherein the second cutting edge, the second toothing and the second bearing surface are arranged on a second side of the center plane of the cutting plate opposite the first side.

[0013] According to a second aspect of the present invention, this problem is solved by a tool holder which has a cutting insert receptacle for receiving and releasably fastening a cutting insert, wherein the cutting insert receptacle comprises: - a third toothing, which has a plurality of third teeth running parallel to each other along a longitudinal direction of the cutting insert mount; - a fourth tooth, comprising a plurality of fourth teeth running parallel to each other along the longitudinal direction of the cutting insert holder; and - a raised section extending along a transverse direction of the cutting insert holder, which is oriented perpendicular to the longitudinal direction of the cutting insert holder, the third tooth runs and spatially separates the third tooth from the fourth tooth, wherein a third contact surface is arranged on the raised section, which extends in the transverse direction of the cutting insert holder and is spaced apart from a central axis of the cutting insert holder, which is oriented transversely to the longitudinal direction of the cutting insert holder and transversely to the transverse direction of the cutting insert holder; wherein the third tooth and the third contact surface are arranged on a first side of an imaginary median plane of the cutting insert holder extending in the transverse direction of the cutting insert holder and along the central axis of the cutting insert holder, and wherein the fourth tooth is arranged on a second side of the median plane of the cutting insert holder opposite the first side.

[0014] According to a third aspect of the present invention, the above-mentioned problem is solved by a cutting tool which has a cutting plate and / or a tool holder according to the invention.

[0015] In the cutting plate according to the invention, the insert seat is formed in particular by two toothed sections extending longitudinally along the cutting plate (here referred to as "first toothed section" and "second toothed section"), which are spatially separated from each other by a groove extending transversely. Within this groove, two opposing contact surfaces are provided, which preferably form the groove flanks.

[0016] The groove, as well as the two transverse toothings, are each provided on the underside of the cutting plate, which is opposite the top side where the at least two cutting edges are located.

[0017] The counterpart to this underside of the cutting insert is the cutting insert holder provided on the tool holder according to the invention. This cutting insert holder has two longitudinal sections. progressive teeth (here called "third tooth" and "fourth tooth") which engage with the first and second teeth on the cutting plate, respectively.

[0018] As a counterpart to the groove provided on the cutting insert, a raised section is provided on the cutting insert holder, which is positioned between the third and fourth teeth and spatially separates these two teeth. A contact surface extending transversely to the cutting insert holder is arranged on the raised section, which is referred to here as the "third contact surface".

[0019] When the tool is mounted, the cutting insert rests with its two teeth (first and second teeth) against the two mating teeth (third and fourth teeth) on the tool holder. Additionally, one of the cutting insert's two contact surfaces (first or second contact surface) rests against the third contact surface, while the other of the two contact surfaces (first or second contact surface) is exposed or has no direct contact with the tool holder.

[0020] The interaction of the two toothed sections and the transverse contact surface within the groove or on the raised section results in an extremely stable and precise insert seat. Furthermore, this type of insert seat allows for the absorption of very high lateral forces without the risk of the cutting insert tilting or twisting relative to the tool holder.

[0021] Furthermore, the connecting surfaces necessary for the insert seat on the underside of the cutting insert and the top of the cutting insert holder can be produced relatively easily and therefore cost-effectively.

[0022] Furthermore, by completely locating the joining surface on the underside of the cutting insert, a high degree of design freedom is achieved. The method of clamping the cutting insert to the tool holder is independent of the geometry of the rake face, the clearance face(s), and the cutting edge geometry. Thus, For example, a cutting insert blank with the defined connection interface can be formed in a wide variety of cutting edge and shape variations.

[0023] A further advantage of the cutting insert and tool holder according to the invention lies in the type and position of the length stop, which is effected by the contact surfaces provided in the groove or on the raised section. The design according to the invention allows for a length stop to be positioned relatively close to the cutting point, resulting in a short lever arm and thus a low torque, which leads to increased stability of the insert seat. Details of this relatively close arrangement of the length stop at the cutting point are explained in detail below.

[0024] It should be noted that "plural" in this context refers to two or more. Furthermore, "transverse" encompasses any orientation that is not parallel. "Transverse" can, but does not necessarily, mean perpendicular or orthogonal. Any other orientation other than 0° is also to be understood as "transverse" in this sense.

[0025] However, it is preferred that the longitudinal direction, the transverse direction, and the central axis of the cutting insert are orthogonal to each other. This also preferably applies to the longitudinal direction, the transverse direction, and the central axis of the cutting insert holder.

[0026] Preferably, the two contact surfaces (first and second contact surface) of the cutting plate run orthogonally to the two teeth (first and second teeth) of the cutting plate.

[0027] Similarly, the raised section on the cutting insert holder preferably runs perpendicular to the third and fourth teeth. This design results in a vertical stop, leading to maximum accuracy and the greatest possible force transmission.

[0028] Preferably, the groove provided on the cutting plate is a single groove of this type.

[0029] According to a preferred embodiment, the groove provided on the cutting plate is designed as a continuous groove which completely crosses the cutting plate in the transverse direction (i.e. from one side to the other).

[0030] According to one embodiment, the geometric shape and / or size of the groove differs from the geometric shape and / or size of a gap between two adjacent first teeth of the first gear and from the geometric shape and / or size of a gap between two adjacent second teeth of the second gear. Particularly preferably, the groove differs in both its geometric shape and its size from the respective gaps between the first and second teeth of the first and second gears, respectively.

[0031] According to one embodiment, it is preferred that the depth of the groove, measured along the central axis, is greater than the first tooth height of the first teeth of the first gear, measured parallel to it, and greater than the second tooth height of the second teeth of the second gear, measured parallel to it. This allows for a comparatively large contact surface on the cutting insert, which is particularly advantageous when high forces need to be absorbed.

[0032] According to a further embodiment, it is preferred that a groove width measured in the longitudinal direction of the cutting plate as the distance between the first and the second contact surface is larger than a tooth width of one of the first teeth of the first toothing measured in the transverse direction of the cutting plate and / or larger than a tooth width of one of the second teeth of the second toothing measured in the transverse direction of the cutting plate.

[0033] According to a further embodiment, the first teeth each have two tooth flanks running parallel to the longitudinal direction of the cutting plate, which run at an acute angle to each other.

[0034] The tooth flanks are therefore designed to be comparatively "steep". This allows for a comparatively high force absorption and thus, especially compared to an obtuse-angled orientation of the two contact surfaces, ensures significantly improved anti-rotation protection as well as improved protection against tilting of the cutting insert.

[0035] Preferably, the acute angle between the tooth flanks is 30°–90°, more preferably 50°–70°, and particularly preferably 59°–61°. In an exemplary, preferred embodiment of the cutting plate according to the invention, the angle between the two tooth flanks of a tooth is 60°.

[0036] It is understood that the aforementioned shape, size and angle ratios apply to both the first teeth of the first gearing and the second teeth of the second gearing due to the described 180° rotational symmetry and the described division into two parts by the imaginary midplane.

[0037] Accordingly, it is particularly preferred that the first teeth of the first gear teeth preferably each have the same cross-sectional shape and size. Likewise, it is preferred that the first teeth of the first gear teeth have the same cross-sectional shape and size as the second teeth of the second gear teeth.

[0038] According to a further embodiment, it is preferred that a radius or a flat surface is arranged between the tooth flanks of one of the first teeth of the first gear at the tip of the respective first tooth. In other words, the two tooth flanks of each of the first teeth of the first gear preferably merge into one another at the tip of the respective tooth via such a radius or such a flat surface. This also applies to the tips of the second teeth of the second gear.

[0039] Furthermore, it is preferred that a radius is provided between two tooth flanks of adjacent teeth of the first and second tooth arrangements. In other words, the first and second teeth, respectively, transition into each other at the tooth base via a radius.

[0040] According to a further embodiment, the tooth flanks are convex, preferably crowned, in a cross-section orthogonal to the longitudinal direction of the cutting plate.

[0041] According to this design, the tooth flanks are convexly curved in cross-section. This results in line contact between the cutting insert and the insert holder of the toolholder. This is particularly advantageous with regard to the precision of the insert seating.

[0042] Interfaces, such as those provided on the underside of the cutting insert, are preferably raw, i.e., unground. A convex design of the tooth flanks therefore enables higher precision of the cutting insert contact with the tool holder.

[0043] According to a further embodiment, the second teeth of the second gearing were aligned with the first teeth of the first gearing.

[0044] The cutting insert can thus be fixed to the tool holder in two different mounting positions. If, for example, the first cutting edge is worn, the cutting insert can be detached from the tool holder, rotated 180° around its central axis, and reattached to the tool holder in this new position, so that the second cutting edge is now used.

[0045] In a further embodiment, the total number of first teeth is an odd number. Likewise, the total number of second teeth is preferably an odd number. Particularly preferably, the total number of first teeth equals the total number of second teeth. For example, the total number of first teeth and the total number of second teeth each equal 3, 5, 7, 9, or 11.

[0046] An odd number of first and second teeth has the advantage, among others, that due to the symmetrical design of the teeth, the middle tooth of the first or second set of teeth runs along the center of the cutting insert, i.e., along the longitudinal axis of the cutting insert. This, in turn, is advantageous in terms of anti-rotation protection, as it keeps the torsional torque to a minimum.

[0047] According to a further embodiment, the first toothing is spatially separated from the groove by a first support wall, on which the first contact surface is arranged. According to this embodiment, the second toothing is also spatially separated from the groove by a second support wall, on which the second contact surface is arranged.

[0048] The two support walls preferably extend parallel to the central axis of the cutting insert beyond the two toothed sections (first and second toothed sections). This results in two opposing, closed walls on which the two contact surfaces are located. In other words, the contact surfaces are not interrupted by the adjacent toothed sections. This results in maximally large contact surfaces that can absorb the greatest possible forces, as the surface pressure is reduced.

[0049] According to a further embodiment, the cutting plate has a through-hole for receiving a fastening element, which runs along or parallel to the central axis of the cutting plate. The fastening element is preferably a clamping screw. The through-hole is preferably designed as a stepped bore to accommodate the screw head in its upper section.

[0050] It is particularly preferred that the diameter of the through-hole is smaller than the groove width measured as the distance between the first and second contact surfaces.

[0051] This is particularly advantageous when the through-hole runs along the central axis of the cutting insert. In this case, if the diameter of the through-hole is smaller than the groove width, the through-hole fits completely into the groove bottom and does not interrupt the two opposing contact surfaces.

[0052] According to a further embodiment, the cutting plate has a first through-opening for receiving a first fastening means and a second through-opening for receiving a second fastening means, wherein the two through-openings run parallel to the central axis of the cutting plate. wherein the first through-hole is arranged on the first side of the center plane of the cutting plate and the second through-hole is arranged on the second side of the center plane of the cutting plate, and wherein the two through-holes are arranged equidistant to the center axis of the cutting plate.

[0053] Such a design with two through-holes or a fastening of the cutting plate using two fastening means is particularly advantageous for larger cutting plates, as this increases the stability of the cutting plate fastening.

[0054] In such a design of the cutting plate with two through-holes, it is particularly preferred that the first through-hole has a greater distance from the center plane of the cutting plate than the first contact surface, and that the second through-hole has a greater distance from the center plane of the cutting plate than the second contact surface. Thus, in this case as well, the two contact surfaces are not interrupted by the through-holes.

[0055] Furthermore, according to one embodiment of the cutting plate with two through-holes, it is preferred that the first through-hole passes through the first toothing, and that the second through-hole passes through the second toothing. The two through-holes are thus arranged in the most space-saving way possible and only minimally impair the toothing.

[0056] In a further embodiment, the first and second contact surfaces run parallel to each other and parallel to the central axis of the cutting plate. This allows for maximum force absorption by the two contact surfaces.

[0057] According to an alternative design, the first contact surface and the second contact surface are inclined to each other in such a way that the groove widens along the central axis towards a groove base.

[0058] This creates a kind of downward pull, which draws the cutting plate into the plate seat.

[0059] The insert holder provided on the toolholder is, as already mentioned, designed as a counterpart to the interface provided on the underside of the insert. The configurations described above for the insert itself therefore also apply in an equivalent manner to the insert holder on the toolholder. Since these configurations lead to similar advantages as those already explained above, the various possible configurations of the insert holder are listed below in abbreviated form, with the above explanations applying accordingly.

[0060] According to one embodiment, a geometric shape and / or size of the elevation differs from a geometric shape and / or size of a gap between two adjacent third teeth of the third gearing and a geometric shape and / or size of a gap between two adjacent fourth teeth of the fourth gearing.

[0061] According to a further embodiment, the third teeth each have two tooth flanks running parallel to the longitudinal direction of the cutting insert holder, which are at an acute angle to each other. Likewise, the fourth teeth preferably each have two tooth flanks running parallel to the longitudinal direction of the cutting insert holder, which are at an acute angle to each other.

[0062] Preferably, the acute angle is 30°–90°, more preferably 50°–70°, and particularly preferably 59°–61°. In a particularly preferred embodiment, the acute angle between the tooth flanks of the third and fourth teeth is 60° each.

[0063] According to another version, the third teeth were aligned with the fourth teeth.

[0064] The total number of third teeth is preferably an even number. Likewise, the total number of fourth teeth is preferably an even number. For example, 2, 4, 6, or 8 third teeth and 2, 4, 6, or 8 fourth teeth are provided.

[0065] According to a further embodiment, the width of the elevation measured in the longitudinal direction of the cutting insert holder is larger, preferably at least twice as large, as the width of one of the third teeth measured in the transverse direction of the cutting insert holder.

[0066] According to a further embodiment, the height of the elevation measured along the central axis is greater than the height of the third teeth measured parallel to it.

[0067] According to a further embodiment, the third toothing is spatially separated from the raised section by a first recess. Likewise, the fourth toothing is preferably spatially separated from the raised section by a second recess.

[0068] According to a further embodiment, the cutting insert holder has a bore with an internal thread for receiving a fastening means, which runs along the central axis of the cutting insert holder or parallel to it.

[0069] Preferably, the diameter of this bore is smaller than the width of the elevation measured in the longitudinal direction of the cutting insert holder.

[0070] According to a further embodiment, the cutting insert holder has a first bore for receiving a first fastening means and a second bore for receiving a second fastening means, wherein the two bores run parallel to the central axis of the cutting insert holder, and wherein the first bore is arranged on the first side of the central plane of the cutting insert holder and the second bore is arranged on the second side of the central plane of the cutting insert holder.

[0071] According to this embodiment, it is preferred that the first bore and the second bore are each arranged on opposite sides of the raised section and are each spaced apart from the raised section. Furthermore, according to this embodiment, it is preferred that the bore passes through the third toothed section, and that the second bore passes through the fourth toothed section.

[0072] It is understood that the aforementioned embodiments of the cutting plate and the tool holder according to the invention also apply accordingly to the tool according to the invention. The following further embodiments of the tool are provided according to the invention:

[0073] In the tool according to the invention, it is preferably provided that in a first assembly state of the tool, in which the first cutting edge is used as the active cutting edge of the tool and has a smaller distance from the third toothing than from the fourth toothing, the first toothing interacts with the third toothing, the second toothing interacts with the fourth toothing, and the first contact surface rests against the third contact surface, while the second contact surface does not rest against the tool holder.

[0074] Furthermore, it is preferred that in a second assembly state of the tool, in which the second cutting edge is used as the active cutting edge of the tool and has a smaller distance from the third toothing than from the fourth toothing, the second toothing interacts with the third toothing, the first toothing interacts with the fourth toothing, and the second contact surface rests against the third contact surface, while the first contact surface does not rest against the tool holder.

[0075] In other words, in each of its two possible mounting positions, the cutting insert only makes contact with the third contact surface with one of its two contact surfaces, while the other contact surface of the cutting insert remains exposed. More precisely, the cutting insert always makes contact with the third contact surface with the contact surface that is closest to the actively used cutting edge. This is particularly advantageous because This ensures that the length stop is positioned as close as possible to the cutting edge, thereby minimizing the risk of the cutting plate twisting and ensuring that the length stop sits very precisely.

[0076] According to a further embodiment, the groove width, measured as the distance between the first and second contact surfaces, is greater than the width of the raised section measured longitudinally in the cutting insert holder. Accordingly, the cutting insert only contacts the third contact surface with one of its two contact surfaces, while the fourth contact surface remains exposed.

[0077] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of the present invention.

[0078] Exemplary embodiments of the invention are shown in the drawings and are explained in more detail in the following description. They show: Fig. 1 shows various views of a first embodiment of the cutting plate according to the invention, wherein Fig. 1A is a perspective view, Fig. 1B is a top view from above, Fig. 1C is a top view from the front, Fig. 1D is a side view and Fig. 1E is a top view from below; Fig. 2 shows different views of a second embodiment of the cutting plate according to the invention, wherein Fig. 2A shows a perspective view, Fig. 2B a top view, Fig. 2C a front view, Fig. 2D a side view and Fig. 2E a bottom view; Fig. 3 shows different views of a third embodiment of the cutting plate according to the invention, wherein Fig. 3A shows a perspective view, Fig. 3B a top view, Fig. 3C a front view, Fig. 3D a side view and Fig. 3E a bottom view; Fig. 4 shows different views of a first embodiment of the tool according to the invention, wherein Fig. 4A shows a perspective view of the tool, Fig. 4B shows an exploded view of the tool, Fig. 4C shows a top view of a cutting insert holder provided on a tool holder of the tool, Fig. 4D shows a cross-sectional view of the tool and Fig. 4E shows a longitudinal section view of the tool; Fig. 5 shows various views of a second embodiment of the tool according to the invention, wherein Fig. 5A is a perspective view of the tool, Fig. 5B is an exploded view of the tool, Fig. 5C is a top view of a cutting insert holder provided on a tool holder of the tool, Fig. 5D is a cross-sectional view of the tool and Fig. 5E is a longitudinal section view of the tool; and Fig. 6 shows a perspective view of a third embodiment of the tool according to the invention.

[0079] Figures 1-3 show three different embodiments of the cutting plate according to the invention, each in different views. The cutting plate as a whole is designated by the reference numeral 10.

[0080] The following section first describes the features of the cutting plate 10, which are common to all three embodiments. Subsequently, the specific features of each embodiment are discussed.

[0081] The cutting insert 10 according to the invention is an indexable insert for machining a workpiece. Such indexable inserts are typically made of carbide.

[0082] The cutting plate 10 is designed with 180° rotational symmetry about a centrally arranged central axis 12. Accordingly, the cutting plate 10 has two identically designed The cutting edges 14, 16 are referred to here as the first cutting edge 14 and the second cutting edge 16.

[0083] The two cutting edges 14, 16 each have an end section 14a, 16a and two lateral sections 14b, 14c and 16b, 16c respectively, adjoining these end sections 14a, 16a at their ends (see Figs. 1B, 2B and 3B). Depending on the application, either the two end sections 14a, 16a or the two lateral sections 14b, 14c, 16b, 16c can be used to machine the workpiece.

[0084] For example, the two end-face sections 14a, 16a can each be used as the main cutting edges, while the side sections 14b, 14c, 16b, 16c can be used as secondary cutting edges. Conversely, using the side sections 14b, 14c, 16b, 16c as the main cutting edges and the end-face sections 14a, 16a as secondary cutting edges is also possible in principle.

[0085] Furthermore, various different shapes of the individual cutting edge sections 14a-14c and 16a-16c are conceivable. In the embodiments shown here, the end-face sections 14a, 16a of the two cutting edges 14, 16 are straight, while the lateral cutting edge sections 14b, 14c and 16b, 16c of the cutting edges 14, 16 are convexly curved.

[0086] The 180° rotationally symmetrical design of the cutting insert 10 enables the two cutting edges 14 and 16 to be used congruently, so that, for example, the first cutting edge 14 is used first and the second cutting edge 16 is only used after the first cutting edge 14 has worn out. For this purpose, the cutting insert 10 simply needs to be detached from the tool holder and rotated 180° around the central axis 12.

[0087] In the embodiment shown here, the cutting plate 10 is not only rotationally symmetrical by 180° with respect to the central axis 12, but also mirror-symmetrical in Referring to an imaginary median plane 18, which divides the cutting plate 10 into two equal halves. This median plane 18 runs along the central axis 12 and along a transverse direction 20, which is oriented orthogonally to the central axis 12.

[0088] However, it is also possible that the two lateral sections 14b, 14c and 16b, 16c of the two cutting edges 14, 16 are not identical or symmetrical to each other. Therefore, the cutting plate 10 does not necessarily have to be mirror-symmetrical to the central plane 18.

[0089] The cutting edges 14, 16 are formed at a transition between a top surface 22 of the cutting plate 10 and a circumferential side 24 of the cutting plate 10 extending transversely to it. The circumferential side 24 of the cutting plate 10 runs between a top surface 22 and a bottom surface 26 opposite the top surface 22.

[0090] On its underside 26, the cutting insert 10 has a mounting interface by means of which the cutting insert 10 can be attached to a tool holder. This mounting interface of the cutting insert 10 ensures a clearly defined fit of the cutting insert 10 and simultaneously prevents it from slipping or rotating relative to the tool holder.

[0091] The mounting interface provided on the underside 26 of the cutting plate 10 has two toothed sections 28, 30, which are referred to here as the first toothed section 28 and the second toothed section 30. The two toothed sections 28, 30 are arranged on opposite sides of the central plane 18 and are spatially separated from each other by a groove 32.

[0092] Both toothed sections 28, 30 are preferably designed to be congruent. They each have several teeth 34, 36 running parallel to each other, wherein the teeth 34 of the first toothed section are referred to as the first teeth 34 for terminological differentiation and the teeth 36 of the second toothed section 30 are referred to here as the second teeth 36. The teeth 34, 36 of the two toothed sections 28, 30 run- The groove 32 runs perpendicular to this along the transverse direction 20.

[0093] In the embodiments shown here, the longitudinal direction 38 runs orthogonally to the transverse direction 20 and orthogonally to the central axis 12. However, it would also be conceivable for the transverse direction 20 to run at an angle of 90° to the longitudinal direction 38. In other words, the groove 32 would then no longer be perpendicular to the teeth 28, 30, but rather inclined or transverse to them. It is understood that the 180° rotationally symmetric properties of the cutting insert 10 could still be achieved in this case.

[0094] As already mentioned, the groove 32 spatially separates the two toothed sections 28 and 30 and runs transversely to them. The toothed sections 28 and 30 serve primarily to absorb forces in the transverse direction 20 and thus prevent slippage in this direction. Since both toothed sections 28 and 30 bear against the tool holder simultaneously in the assembled state, they can absorb torques about the central axis 12 and thus also prevent rotation of the cutting insert 10.

[0095] The groove 32, on the other hand, serves to absorb forces in the longitudinal direction 38 and thus essentially functions as a length stop for the cutting insert 10. For this purpose, two opposing contact surfaces 40, 42 are arranged in the groove 32, which are referred to here as the first contact surface 40 and the second contact surface 42. The two contact surfaces 40, 42 each extend in the transverse direction 20 and are equidistant from the central axis 12 of the cutting insert 10.

[0096] The first contact surface 40 is arranged together with the first cutting edge 14 and the first tooth 28 on a first side of the median plane 18. The second contact surface 42 is arranged together with the second cutting edge 16 and the second tooth 30 on a second side of the median plane 18 opposite the first side.

[0097] The shape of the first teeth 34 of the first gear 28 is particularly evident in Fig. 1C. In the embodiments shown here, the first gear 28 has a total of five first teeth 34. With a total of five first teeth 34, similar to a total of 3, 7, or 9 first teeth 34, one of the first teeth 34 is located in the center of the cutting insert 10, so that, in other words, it runs along the longitudinal axis of the cutting insert 10. The remaining first teeth 34 run parallel to this central first tooth 34 on both sides. This results in an arrangement of the first teeth 34 that is symmetrical about a longitudinal plane of the cutting insert 10, which runs orthogonally to the central plane 18 and along the central axis 12.

[0098] The first teeth 34 of the first gear 28 have a substantially V-shaped cross-section. Each of these first teeth 34 has two tooth flanks 44, 46 extending longitudinally 38 along the cutting insert 10. The two tooth flanks 44, 46 can each be flat or slightly convex. A flat design results in a corresponding surface contact, while a convex design results more in a linear contact.

[0099] Regardless of whether the tooth flanks 44, 46 are convex or flat, the two tooth flanks 44, 46 are preferably inclined at an acute angle to each other. This angle is shown as angle a in Fig. 1 C. The angle a is preferably selected in the range of 30°–90°. In the embodiments of the cutting insert 10 shown here, the angle a = 60°.

[0100] A radius 48 is provided between each of the individual teeth 34. Two adjacent teeth 34 are connected to each other via such a radius 48 at the root of the respective tooth 34. The tips 50 of the teeth 34 are preferably also provided with a radius. Alternatively, a flat surface can be provided here, so that in this case the toothing 28 would then contact the tool holder not only with the tooth flanks 44, 46, but also with the flattened tips. However, this would lead to static overdetermination, which would require extremely precise manufacturing with minimal tolerances.

[0101] It is understood that the features described above for the first toothing 28 also apply to the second toothing 30 and its teeth 36. Preferably, the first teeth 34 of the first toothing 28 are aligned with the second teeth 36 of the second toothing 30.

[0102] The groove 32 differs in size and shape from the spaces between two adjacent first and second teeth 34, 36. The contact surfaces 40, 42 form the groove flanks of the groove 32. The two contact surfaces 40, 42 are connected to each other by a base surface 52 located in the groove base. Preferably, the groove 32 extends across the entire width of the cutting insert 10.

[0103] Furthermore, it is preferred that the groove 32 is significantly wider than the respective gaps between the teeth 34, 36 of the gear teeth 28, 30. In other words, the groove width b of the groove 32, measured in the longitudinal direction 38 as the distance between the contact surfaces 40, 42, is greater, preferably at least twice or at least three times greater, than the distance a between the tooth flanks 44, 46 of two adjacent teeth 34. Likewise, the depth of the groove 32 measured along the central axis 12 is preferably greater than the height h of the first teeth 34 measured parallel to it.

[0104] Furthermore, the groove 32 also differs in its cross-sectional shape from the cross-sectional shape of the spaces between the teeth 34, 36 of the gear teeth 28, 30. In the first embodiment shown in Fig. 1, the two contact surfaces 40, 42, which form the groove flanks of the groove 32, run parallel to each other. The two contact surfaces 40, 42 thus run parallel to the median plane 18 and orthogonal to the longitudinal direction 38.

[0105] In the second embodiment of the cutting plate 10 shown in Fig. 2, the two contact surfaces 40, 42 are inclined at an angle to each other. More precisely, the two contact surfaces 40, 42 are inclined to each other in such a way that the groove 32 widens along the central axis 12 towards the bottom of the groove (base surface 52). This creates a kind of downward slope by which the cutting plate 10 is drawn into the groove 52. The cutting insert is drawn into the tool holder provided for. Apart from the different cross-sectional shape of the groove 32, the cutting insert 10 according to the second embodiment shown in Fig. 2 is identical to the cutting insert 10 according to the first embodiment shown in Fig. 1.

[0106] A further difference arises in the third embodiment of the cutting plate 10 shown in Fig. 3. Unlike the two embodiments shown in Figs. 1 and 2, the cutting plate 10 in the third embodiment shown in Fig. 3 has not just one through-opening 54 for receiving a fastening element, but two through-openings 54.1, 54.2, each for receiving a fastening element. The configuration shown in Fig. 3 with two through-openings 54.1, 54.2 is particularly suitable for cutting plates 10 of this type whose longitudinal dimension 38 (length of the cutting plate 10) is comparatively large. In such cases, the use of two fastening elements leads to improved protection against tilting.

[0107] In the first embodiments shown in Figures 1 and 2, the single through-opening 54 is arranged centrally in the cutting plate 10. Here, the through-opening 54 runs along the central axis 12. Accordingly, in the first two embodiments, the through-opening 54 opens into the groove 32. To prevent the through-opening 54 from passing through the contact surfaces 40, 42, the groove width b is preferably chosen to be larger than the diameter of the through-opening 54.

[0108] In the third embodiment of the cutting plate 10 shown in Fig. 3, the two through-openings 54.1, 54.2 are arranged equidistant from the central plane 18. The first through-opening 54.1 is located on the first side of the central plane 18 together with the first cutting edge 14, the first toothing 28 and the first bearing surface 40. The second through-opening 54.2 is located on the second side of the central plane 18 together with the second cutting edge 16, the second toothing 30 and the second bearing surface 42.

[0109] The two through-holes 54.1, 54.2 are each located further from the central plane 18 than the two contact surfaces 40, 42. Thus, the two through-holes 54.1, 54.2 are positioned further outwards in the longitudinal direction 38 than the contact surfaces 40, 42. The first through-hole 54.1 passes through the first toothing 28. The second through-hole 54.2 passes through the second toothing 30 (see Fig. 3E).

[0110] Although not strictly necessary, all three embodiments of the cutting insert shown here share the following feature: According to the embodiments shown, the cutting insert 10 each has two support walls 56, 58, which form the groove flanks of the groove 32 on which the contact surfaces 40, 42 are arranged. In other words, the first tooth 28 is spatially separated from the groove 32 by a first support wall 56, and the second tooth 30 is spatially separated from the groove 32 by a second support wall 58. Thus, the groove 32 does not directly traverse the tooth 28, 30. Accordingly, these support walls 56, 58 provide continuous contact surfaces 40, 42, since the support walls 56, 58 project parallel to the central axis 12 over the tips of the teeth 34, 36 of the tooth 28, 30.However, it would also be possible in principle to do without these support walls 56, 58, so that the groove 32 would then directly cross the teeth 28, 30 and the contact surfaces 40, 42 would then be designed to be correspondingly smaller, since they would be directly adjacent to the teeth 34, 36 of the teeth 28, 30 at the top and bottom respectively.

[0111] It should also be noted that the groove 32 according to the third embodiment shown in Fig. 3 has the same cross-sectional shape as the groove 32 according to the first embodiment shown in Fig. 1. Of course, in an embodiment with two through-openings 54.1, 54.2, as shown in the third embodiment, it would also be possible to design the groove 32 as in the second embodiment shown in Fig. 2 (see Fig. 1D, 2D and 3D).

[0112] Fig. 4 shows various views of an embodiment of a tool in which the cutting insert 10 is used according to the first embodiment shown in Fig. 1. The tool as a whole is designated by the reference numeral 100.

[0113] The tool 100 is designed as a turning tool, specifically as a turning tool for plunge turning. The tool 100 has a tool holder 60 to which the cutting insert 10 is attached by means of a clamping screw 62. The tool holder 60 can also be referred to as a cutting insert holder.

[0114] In a front section, the tool holder 60 has a cutting insert receptacle 64 for receiving and detachably securing the cutting insert 10. In the opposite rear section 66, the tool holder 60 is essentially beam-shaped. This rear section 66 of the tool holder 60 serves for clamping in a machine tool.

[0115] Fig. 4C shows the details of the cutting insert holder 64 in a top view. Similar to the cutting insert 10, the cutting insert holder 64 also has two spaced-apart, separate toothed sections 68, 70, which are referred to here as the third toothed section 68 and the fourth toothed section 70. Unlike the first and second toothed sections 28, 30, the two toothed sections 68, 70 are not identical in their overall design. However, both toothed sections 68, 70 have teeth 72, 74, which have an identical cross-sectional shape and serve as counterparts to the teeth 34, 36 of the toothed sections 28, 30, which are arranged on the cutting insert.

[0116] The teeth 72 of the third gear 68 are referred to herein as third teeth 72. The teeth 74 of the fourth gear 70 are referred to herein as fourth teeth 74. Both the third and fourth teeth 72, 74 run parallel to each other along a longitudinal direction 76 of the cutting insert holder 64. The third teeth 72 of the third gear 68 are aligned with the fourth teeth 74 of the fourth gear 70. The third gear 68 preferably has an even number of third teeth 72. Likewise, the fourth gear 70 preferably has an even number of fourth teeth 74. In the embodiment shown in Fig. 4, both gears 68, 70 each have a total of four teeth.

[0117] As shown in Fig. 4D, the third teeth 72 and the fourth teeth 74 are essentially congruent counterparts to the first teeth 34 and the second The tooth flanks 78, 80 of each tooth 72, 74 are preferably also inclined to each other at an acute angle, particularly preferably at an angle of 60°. In the assembled state of the tool 100, the tooth flanks 44, 46 of the teeth 34, 36 thus bear against the tooth flanks 78, 80 of the teeth 72, 74 in a line or surface contact.

[0118] The two toothed sections 68, 70 are spatially separated from each other by a raised section 82. This raised section 82 extends along a transverse direction 84 of the cutting insert holder 64, which in this case runs orthogonally to the longitudinal direction 76 of the cutting insert holder 64. A third contact surface 86 is arranged on the raised section 82, which extends in the transverse direction 84 and is spaced apart from a central axis 88 of the cutting insert holder 64. The central axis 88 runs transversely (here orthogonally) to the longitudinal direction 76 and the transverse direction 84 of the cutting insert holder 64 and extends approximately centrally within the raised section 82.

[0119] The third toothing 68 and the third contact surface 86 are arranged on a first side of an imaginary center plane of the cutting insert holder 64, which extends in the transverse direction 84 of the cutting insert holder 64 and along the central axis 88 of the cutting insert holder 64. The fourth toothing 70 is arranged on a second side of this center plane 90 opposite the first side.

[0120] In the embodiment shown here, the third tooth 68 is spatially separated from the raised section 82 by a first recess 92. The fourth tooth 70 is separated from the raised section 82 by a second recess 94. Both recesses 92 and 94 run parallel to each other in the transverse direction 84. The recesses 92 and 94 serve as counterparts to the support walls 56 and 58 projecting from the tooth 28 and 30 in the direction of the central axis 12 of the cutting insert.

[0121] The insert holder 64 further comprises a bore 83 in which an internal thread 85 is arranged, into which the clamping screw 62 engages. The central axis of this bore 83 may, but need not, coincide with the central axis 88 or the central plane 90 of the insert holder 64. The bore axis of the bore 83 However, it is preferably aligned parallel to the central axis 88 or the central plane 90 of the cutting insert holder 64. In the first embodiment of the tool 100 shown in Fig. 4, the bore 83 is arranged in the raised area 82. In other words, the bore 83 passes through the raised area 82.

[0122] Fig. 4E shows a longitudinal section through the tool 100 along the longitudinal direction 76. This clearly shows how the cutting insert 10, in its mounted state, rests against the cutting insert receptacle 64 of the tool holder 60. Due to the 180° rotationally symmetrical properties of the cutting insert 10, there are exactly two mounting states. In the first mounting state of the tool, the first cutting edge 14 is used as the active cutting edge of the tool 100. In this first mounting state, the first cutting edge 14 of the cutting insert 10 projects forward at its end face beyond the tool holder 60. Since the third tooth 68 arranged on the cutting insert receptacle 64 adjoins the front, end face of the tool holder 60, in this first mounting state the first cutting edge 14 is closer to the third tooth 68 than to the fourth tooth 70.In this first assembly state, the first tooth 28 engages with the third tooth 68. Furthermore, the second tooth 30 engages with the fourth tooth 70. The first contact surface 40, which rests against the third contact surface 86, serves as a length stop in this first assembly state. The second contact surface 42 of the cutting insert 10, however, does not rest against the tool holder 60 in this first assembly state. This is primarily due to the fact that the raised section 82 has a width b2, measured in the longitudinal direction 76 of the cutting insert receptacle 64, which is smaller than the groove width b of the groove 32. Therefore, the cutting insert 10 rests against the tool holder 60 with only one of its two contact surfaces 40, 42. More precisely, the cutting insert 10 rests against the tool holder 60 with the contact surface 40, 42 that faces the actively cutting part of the cutting insert 10.

[0123] The fastening element or clamping screw 62 is designed such that, on the one hand, the cutting insert is pressed with its two teeth 28, 30 into the teeth 68, 70 provided in the cutting insert holder 64, and on the other hand, the cutting insert 10 is also pulled with its respective contact surfaces 40, 42 against the third contact surface 86. Thus, the direction of pull through the fastening element or the Clamping screw 62 in the direction of the inactive or non-cutting area of ​​the cutting plate 10.

[0124] This type of clamping of the cutting insert 10 also has the advantage that the length stop provided by the third contact surface 86 is located relatively far forward in the area of ​​the actively cutting part of the cutting insert 10, i.e., at a short distance from the actively cutting cutting edge 14 of the cutting insert 10. This, in turn, is particularly advantageous for stability reasons, since the moments resulting from transverse forces can thus also be effectively absorbed by the third contact surface 86.

[0125] In the second possible assembly state, the cutting insert 10 is rotated 180° about its central axis 12, so that the second cutting edge 16 then forms the active cutting edge and has a smaller distance to the third tooth 68 than to the fourth tooth 70. In this second assembly state, the second tooth 30 of the cutting insert 10 engages with the third tooth 68, and the first tooth 28 of the cutting insert 10 engages with the fourth tooth 70. The second contact surface 42 of the cutting insert 10 then rests against the third contact surface 86. The first contact surface 40 of the cutting insert 10 does not rest against the tool holder 60 in this second assembly state.

[0126] Figures 5A-5E show a second embodiment of the tool 100 according to the invention in various views. In this second embodiment of the tool 100, the cutting insert 10 according to the third embodiment shown in Figure 3 is used. Accordingly, the cutting insert holder 64 according to this embodiment of the tool 100 has two bores 83.1 and 83.2, each with an internal thread 85.1, 85.2, into which a clamping screw 62.1, 62.2 engages. The first bore 83.1 passes through the third tooth 68. The second bore 83.2 passes through the fourth tooth 70. Thus, the first bore 83.1, together with the third tooth 68 and the third contact surface 86, is located on the first side of the center plane 90 of the cutting insert holder 64, while the second bore 83.2, together with the fourth tooth 70, is located on the opposite second side of the center plane 90.

[0127] In this embodiment as well, the cutting insert 10, with its two teeth 28, 30, rests against the two teeth 68, 70 provided on the cutting insert holder 64. The length stop is again provided by the third contact surface 86, which is located on the raised section 82. Depending on the assembly state, the cutting insert 10 therefore rests against the third contact surface 86 with only one of its two contact surfaces 40, 42, while the other of its two contact surfaces 40, 42 is exposed and does not contact the tool holder 60.

[0128] Fig. 6 shows a third embodiment of the tool 100 according to the invention. Here, the tool 100 is designed as a gear skiving tool, which has a tool holder 60 that is rotationally symmetrical about a longitudinal axis 96 of the tool holder. A plurality of cutting inserts 10 are detachably attached to this tool holder 60. The cutting inserts 10 are arranged circumferentially around the tool holder 60.

[0129] The cutting inserts 10 are the cutting inserts according to the invention, which correspond to the first embodiment shown in Fig. 1. It is understood, however, that the cutting inserts 10 according to the second or third embodiment can also be arranged on such a tool holder 60 for a gear skiving tool 100.

Claims

Patent claims 1. Cutting insert (10) for a tool (100) for machining a workpiece (60), wherein the cutting insert (10) has: - a top side (22); - one perimeter page (24); - a first cutting edge (14) which is formed at the transition between the top surface (22) and the circumferential side (24); - a second cutting edge (16) which is formed at the transition between the top surface (22) and the circumferential side (24); - a bottom surface (26) opposite the top surface (22) and designed to be rotationally symmetrical 180° to a central axis (12) of the cutting plate (10); - a first toothing (28) which is arranged on the underside (26) and has a plurality of first teeth (34) which run parallel to each other along a longitudinal direction (38) of the cutting plate (10), which is oriented transversely to the central axis (12) of the cutting plate (10); - a second toothing (30) arranged on the underside (26) and comprising a plurality of second teeth (36) running parallel to each other along the longitudinal direction (38) of the cutting insert (10); and - a groove extending along a transverse direction (20) of the cutting insert (10), which is oriented transversely to the central axis (12) of the cutting insert (10) and transversely to the longitudinal direction (38) of the cutting insert (10), and spatially separating the first toothing (28) from the second toothing (30), wherein a first contact surface (40) and a second contact surface (42) are arranged in the groove (32), which each extend in the transverse direction (20) of the cutting insert (10), are opposite each other with respect to the central axis (12) of the cutting insert (10) and have an equal distance from the central axis (12) of the cutting insert (10); wherein an imaginary median plane (18) extending in the transverse direction (20) of the cutting insert (10) and along the central axis (12) of the cutting insert (10) Cutting plate (10) dividing the groove (32) into two equal halves, wherein the first cutting edge (14), the first toothing (28) and the first contact surface (40) are arranged on a first side of the median plane (18) of the cutting plate (10), and wherein the second cutting edge (16), the second toothing (30) and the second contact surface (42) are arranged on a second side of the median plane (18) of the cutting plate (10) opposite the first side.

2. Cutting plate according to claim 1, wherein a geometric shape and / or size of the groove (32) differs from a geometric shape and / or size of a gap between two adjacent first teeth (34) of the first toothing (28) and a geometric shape and / or size of a gap between two adjacent second teeth (36) of the second toothing (30).

3. Cutting plate according to claim 1 or 2, wherein a groove width (b) measured as the distance between the first and the second contact surface (40, 42) is greater, preferably at least twice greater, than a distance between two adjacent first teeth (34), and / or wherein a depth of the groove (32) measured along the central axis (12) is greater than a height (h) of the first teeth measured parallel thereto.

4. Cutting plate according to one of claims 1-3, wherein the first teeth (34) each have two tooth flanks (44, 46) extending parallel to the longitudinal direction (38) of the cutting plate (10), which extend at an acute angle (a) to each other.

5. Cutting plate according to claim 4, wherein the acute angle (a) is 30°-90°, preferably 50°-70°, particularly preferably 59°-61°.

6. Cutting plate according to claim 4 or 5, wherein the tooth flanks (44, 46) are convex, preferably crowned, in a cross-section orthogonal to the longitudinal direction (38) of the cutting plate (10).

7. Cutting plate according to one of claims 1-6, wherein the second teeth (36) of the second toothing (30) are aligned with the first teeth (34) of the first toothing (28).

8. Cutting plate according to one of claims 1-7, wherein the total number of first teeth (34) is an odd number.

9. Cutting plate according to one of claims 1-8, wherein the first toothing (28) is spatially separated from the groove (32) by a first support wall (56) on which the first contact surface (40) is arranged, and wherein the second toothing (30) is spatially separated from the groove (32) by a second support wall (58) on which the second contact surface (42) is arranged.

10. Cutting plate according to one of claims 1-9, wherein the cutting plate (10) has a through-opening (54) for receiving a fastening means (62) which runs along the central axis (12) of the cutting plate (10) or parallel thereto.

11. Cutting plate according to claim 10, wherein a diameter (D) of the through-hole (54) is smaller than a groove width (b) measured as the distance between the first and the second contact surface (40, 42).

12. Cutting plate according to any one of claims 1-11, wherein the cutting plate (10) has a first through-opening (54.1) for receiving a first fastening means (62.1) and a second through-opening (54.2) for receiving a second fastening means (62.2), wherein the two through-openings (54.1, 54.2) extend parallel to the central axis (12) of the cutting plate (10), wherein the first through-opening (54.1) is arranged on the first side of the central plane (18) of the cutting plate (10) and the second through-opening (54.2) is arranged on the second side of the central plane (18) of the cutting plate (10).

13. Cutting plate according to claim 12, wherein the first through-hole (54.1) has a greater distance from the central plane (18) of the cutting plate (10) than the first contact surface (40), and wherein the second through-hole (54.2) has a greater distance from the central plane (18) of the cutting plate (10) than the second contact surface (42).

14. Cutting plate according to claim 12 or 13, wherein the first through-hole (54.1) passes through the first toothing (28), and wherein the second through-hole (54.2) passes through the second toothing (30).

15. Cutting plate according to one of claims 1-14, wherein the first contact surface (40) and the second contact surface (42) are parallel to each other and parallel to the central axis (12) of the cutting plate (10).

16. Cutting plate according to one of claims 1-15, wherein the first contact surface (40) and the second contact surface (42) are inclined to each other such that the groove (32) widens along the central axis (12) of the cutting plate (10) in the direction of a groove base (52).

17. Tool holder (60) for a tool (100) for machining a workpiece, wherein the tool holder (60) has a cutting insert holder (64) for receiving and releasably fastening a cutting insert (10), wherein the cutting insert holder (64) has: - a third toothing (68) having a plurality of third teeth (72) running parallel to each other along a longitudinal direction (76) of the cutting insert holder (64); - a fourth tooth (70) comprising a plurality of fourth teeth (74) running parallel to each other along the longitudinal direction (76) of the cutting insert holder (64); and - a raised section (82) extending along a transverse direction (84) of the cutting insert holder (64), which is transverse to the longitudinal direction (76) of the cutting insert holder (64) is aligned, extends and spatially separates the third toothing (68) from the fourth toothing (70), wherein a third contact surface (86) is arranged on the raised section (82), which extends in the transverse direction (84) of the cutting insert holder (64) and is spaced away from a central axis (88) of the cutting insert holder (64), which is aligned transversely to the longitudinal direction (76) of the cutting insert holder (64) and transversely to the transverse direction (84) of the cutting insert holder (64); wherein the third toothing (68) and the third contact surface (86) are arranged on a first side of an imaginary median plane (90) of the cutting insert holder (64) extending in the transverse direction (84) of the cutting insert holder (64) and along the central axis (88) of the cutting insert holder (64), and wherein the fourth toothing (70) is arranged on a second side of the median plane (90) of the cutting insert holder (64) opposite the first side.

18. Tool (100) for machining a workpiece, comprising: a cutting insert (10) according to one of claims 1-16; and / or a tool holder (60) according to claim 17.

19. Tool according to claim 18, wherein in a first assembly state of the tool (100), in which the first cutting edge (14) is used as the active cutting edge of the tool (100) and has a smaller distance from the third tooth (68) than from the fourth tooth (70), the first tooth (28) interacts with the third tooth (68), the second tooth (30) interacts with the fourth tooth (70), and the first contact surface (40) bears against the third contact surface (86), while the second contact surface (42) does not bear against the tool holder (60), and wherein in a second assembly state of the tool (100), in which the second cutting edge (16) is used as the active cutting edge of the tool (100) and has a smaller distance from the third tooth (68) than from the fourth tooth (70), the second tooth (30) interacts with the third Interlocking (68) interacts,the first toothing (28) interacts with the fourth toothing (70) and the second approach, The support surface (42) rests against the third support surface (86), while the first support surface (40) does not rest against the tool holder (60).

20. Tool according to claim 18 or 19, wherein a groove width (b) measured as the distance between the first and the second contact surface (40, 42) is greater than a width (b2) of the elevation (82) measured in the longitudinal direction of the cutting insert holder (64).

Images