Cutting insert, clamping claw and tool for clamping such a cutting insert

Abstract

The invention relates to a cutting insert (1) for interchangeable clamping in a tool (3), wherein the cutting insert (1) has a first surface (5) and a second surface (7) opposite the first surface (5) along a thickness direction, wherein a first clamping geometry (9) for clamping the cutting insert (1) in the tool (3) is arranged at least on the first surface (5), wherein the first clamping geometry (9) has at least one clamping surface (11) which extends along a longitudinal direction (L) of the clamping surface, and wherein two clamping points (S1, S2), which are arranged spaced apart from one another on a projection line (P) of an imaginary straight line oriented parallel to the longitudinal direction (L) of the clamping surface onto the clamping surface (11), have different distances from an imaginary reference plane (13), to which the thickness direction is perpendicular.

Description

[0001] MAP AL Factory for Precision Tools Dr. Kress KG

[0002] DESCRIPTION

[0003] Cutting plate, clamping claw and tool for clamping such a cutting plate

[0004] The invention relates to a cutting insert, a clamping claw and a tool with a plate seat for clamping such a cutting insert.

[0005] DE 196 27 990 CI discloses a cutting insert for interchangeable clamping in a tool, which cutting insert has a first surface and a second surface opposite the first surface along a thickness direction, wherein a clamping geometry for clamping the cutting insert in the tool is arranged on the first surface. The first clamping geometry, which has a clamping groove, has at least one clamping surface as the groove base of the clamping groove, which extends along a clamping surface longitudinal direction. With respect to the first surface of the cutting insert, which functions as a reference plane, the clamping surface always has an identical depth, i.e., identical distances from the reference plane, along any straight line extending parallel to the clamping surface longitudinal direction.A particular disadvantage of this is that with such a clamping geometry, the support of centrifugal forces, especially at high speeds of a tool containing the cutting insert, can be improved. Furthermore, the clamping of such a clamping geometry to a tool, especially by means of a clamping claw, can be improved with regard to the required installation space, particularly the space required to attach the clamping claw to the tool. This typically creates a conflict with other structures to be integrated into the tool, such as coolant channels.

[0006] The invention is therefore based on the object of creating a cutting insert, a clamping claw and a tool with a plate seat for clamping such a cutting insert, wherein the disadvantages mentioned are at least reduced, preferably do not occur.

[0007] The object is achieved by providing the present technical teaching, in particular the teaching of the independent claims as well as the embodiments disclosed in the dependent claims and the description.The object is achieved in particular by providing a cutting insert for interchangeable clamping in a tool, wherein the cutting insert has a first surface and a second surface opposite the first surface along a thickness direction, wherein a first clamping geometry for clamping the cutting insert in the tool is arranged at least on the first surface, wherein the first clamping geometry has at least one clamping surface which extends along a clamping surface longitudinal direction, and wherein two clamping points which are arranged spaced apart from one another on a projection line of an imaginary straight line oriented parallel to the clamping surface longitudinal direction onto the clamping surface have different distances from an imaginary reference plane to which the thickness direction is perpendicular.The cutting insert according to the invention advantageously enables clamping to a tool in which centrifugal forces are particularly well supported, even at high tool speeds. This also has a beneficial effect on the quality of holes machined by the tool and the cutting insert. Furthermore, the proposed clamping geometry allows for a space-saving arrangement of the cutting insert and a clamping claw provided for its clamping on the tool, thus leaving sufficient space for the integration of internal structures, particularly coolant channels.

[0008] In particular, the first clamping geometry is formed on the first surface.

[0009] In particular, the clamping surface has its longest extension along a first direction, and in particular a greater extension than along a second direction perpendicular to the first direction. Accordingly, this first direction of longest extension of the clamping surface is referred to as the "clamping surface longitudinal direction."

[0010] In one embodiment, the reference plane is an imaginary plane to which an axis of symmetry of the cutting insert or an axis along whose direction the cutting insert is intended to be inserted into an insert seat of a tool or placed on a base surface of the insert seat is perpendicular. In one configuration, the reference plane is an imaginary plane to which an n-fold rotational symmetry axis of the cutting insert is perpendicular; the n-fold rotational symmetry of the cutting insert results in particular from the configuration of the first clamping geometry as a clamping star and / or due to n cutting corners formed on the cutting insert, where n is a natural number greater than 1. In another configuration, the cutting insert has a round geometry, wherein in this case the n-fold rotational symmetry preferably results solely from the configuration of the first clamping geometry as a clamping star.A specific height of the reference plane along the axis of symmetry is not crucial with regard to the present technical teaching; rather, the two spaced-apart clamping points on the clamping surface always have different distances from the reference plane, regardless of the height at which it is arranged, particularly since the clamping surface is at least locally inclined relative to the reference plane. However, one embodiment provides for the cutting insert to have n cutting edges, with all of the n cutting edges lying in the reference plane; in this case, the height of the reference plane is also defined.

[0011] In the context of the present technical teaching, a clamping point is understood in particular to be a location on the clamping surface into which clamping forces are intended to be introduced when the cutting insert is clamped in a tool; in particular, a clamping point is not necessarily a point-shaped location or area on the clamping surface in the strict mathematical sense, but at which a clamping claw intended to clamp the cutting insert in a tool acts when the cutting insert is clamped in the tool. In particular, a clamping point is an imaginary force introduction point. The clamping forces do not necessarily have to be introduced into the clamping surface in a point-like manner or only at specific locations; rather, an application of the clamping claw at least in part or overall in a linear or even planar manner is preferable, at least from certain perspectives; however, a point-like force introduction is not excluded.In any case, a clamping point is understood to be an imaginary clamping point which, for example, in the case of linear or planar force introduction, can be located on a corresponding force introduction line or force introduction surface.

[0012] To observe the two clamping points, an imaginary straight line is constructed that is aligned parallel to the longitudinal direction of the clamping surface. If the longitudinal direction of the clamping surface is constructed such that it is perpendicular to the thickness direction and, in particular, intersects the axis of symmetry of the cutting insert, the imaginary straight line can be spaced from the longitudinal direction of the clamping surface at a distance perpendicular to the latter. The imaginary straight line constructed in this way is projected onto the clamping surface, resulting in the projection line on which the two clamping points lie. In particular, the distance between the clamping points is measured by dropping a perpendicular line onto the reference plane from the respective clamping point and measuring the corresponding length of the perpendicular line, i.e., the distance perpendicular to the reference plane. The cutting insert is designed, in particular, for machining a workpiece, in particular having at least one geometrically defined cutting edge.In one embodiment, the cutting insert is configured for fine machining of the workpiece. Alternatively or additionally, the cutting insert is configured for metal machining, i.e., for machining a metal workpiece.

[0013] According to a further development of the invention, the first clamping geometry comprises a clamping groove recessed into the first surface, with the clamping surface being formed as the groove base of the clamping groove. Advantageously, the clamping forces can thus be introduced close to a center of gravity or center point of the cutting insert, which contributes to particularly stable clamping.

[0014] In one embodiment, the clamping surface longitudinal direction is also a groove longitudinal direction of the clamping groove.

[0015] According to a further development of the invention, it is provided that the clamping surface is inclined relative to the reference plane about an imaginary inclination axis oriented obliquely to the clamping surface longitudinal direction by a first finite angle.

[0016] In one embodiment, the imaginary inclination axis is perpendicular to the longitudinal direction of the clamping surface.

[0017] In other words, a first imaginary measuring line running parallel to the longitudinal direction of the clamping surface encloses the first angle with the reference plane.

[0018] In other words, the clamping surface has a smaller distance from the reference plane at a first end than at a second end, opposite the first end along the longitudinal direction of the clamping surface. This means, in particular, that the clamping surface is located lower at the second end in the thickness direction—or in the direction of the axis of symmetry—relative to the reference plane than at the first end. In particular, the clamping groove is deeper at its second end than at its first end.

[0019] The clamping surface is thus inclined relative to the reference plane, in particular along the longitudinal direction of the clamping surface; in particular, it slopes downward relative to the reference plane along the longitudinal direction of the clamping surface. According to a further development of the invention, the first angle is from 0.1° to 20°, in particular from 0.5° to 13°, in particular from 0.8° to 8°, in particular from 1° to 4°, in particular from 1.5° to 3.5°, in particular from 2° to 3°, in particular 2.5°.

[0020] According to a further development of the invention, the clamping surface has a width measured perpendicular to the longitudinal direction of the clamping surface and varying along the longitudinal direction of the clamping surface. In one embodiment, the clamping groove has a width measured perpendicular to the longitudinal direction of the clamping surface and varying along the longitudinal direction of the clamping surface.

[0021] In one embodiment, the width increases from the first end of the clamping surface to the second end of the clamping surface, in particular the clamping groove. In one configuration, the width increases linearly from the first end to the second end of the clamping surface.

[0022] According to a further development of the invention, it is provided that the at least one clamping surface has an interruption arranged along the longitudinal direction of the clamping surface, so that the at least one clamping surface has two clamping regions spaced apart from one another.

[0023] Alternatively, it is possible for the at least one clamping surface to be designed without interruption, i.e. to have no interruption, wherein the clamping surface then has in particular a continuous clamping area.

[0024] In one embodiment, the interruption is arranged centrally along the longitudinal direction of the clamping surface.

[0025] The interruption advantageously acts as a chip deflector when machining a workpiece using the cutting insert.

[0026] In one embodiment, the interruption is designed as an undamaged region, particularly centrally located in the clamping surface—in particular the clamping groove—simply as a type of island or elevation in the clamping groove. A surface of the interruption can be arranged in the thickness direction or in the direction of the axis of symmetry at the level of the first surface and / or parallel to the first surface. The interruption divides the clamping surface into two spaced-apart, particularly separate, clamping regions. In particular, one of the clamping points is located in each of the clamping regions. This advantageously allows for particularly stable introduction of the clamping forces into the cutting insert.

[0027] According to a further development of the invention, the cutting insert is polygonal with at least two cutting edges diametrically opposed along an imaginary connecting line, wherein the longitudinal direction of the clamping surface of the at least one clamping surface forms a second finite angle with the imaginary connecting line. This advantageously allows for a particularly space-saving integration of the cutting insert and, in particular, also of a clamping claw clamping the cutting insert on a tool, thus leaving sufficient space for the integration of internal structures such as coolant channels.

[0028] In one embodiment, the cutting insert is polygonal, in particular a regular polygon. In another configuration, the cutting insert is hexagonal and has six cutting corners and correspondingly six geometrically defined cutting edges that connect two immediately adjacent cutting corners.

[0029] However, the cutting plate can also be round with at least one cutting edge that runs at least partially in the circumferential direction around the thickness direction or axis of symmetry.

[0030] The cutting plate can be hardened and / or coated at least in some areas, in particular in the area of ​​at least one cutting edge, for example with polycrystalline diamond or the like.

[0031] In one embodiment, the second angle is from 0.1° to 55°, in particular from 4° to 21°, in particular from 5° to 20°, in particular 14° or 16°.

[0032] According to a further development of the invention, a second imaginary measuring line on the clamping surface, running perpendicular to the longitudinal direction of the clamping surface, encloses a third finite angle with the reference plane. This advantageously allows for a particularly favorable and stable introduction of the clamping forces into the cutting insert. In one embodiment, the third angle is from 0.1° to 45°, in particular from 1° to 35°, in particular 25°.

[0033] According to a further development of the invention, it is provided that the first clamping geometry has n clamping surfaces, where n is a natural number greater than 1, and where the n clamping surfaces are arranged distributed on the first surface with n-fold rotational symmetry.

[0034] In one embodiment, the cutting plate additionally has n cutting corners, whereby it can in particular have an n-cornered geometry.

[0035] In one embodiment, the first clamping geometry has n clamping grooves. The particularly n-fold rotationally symmetrical arrangement of the clamping grooves results in a clamping star on the first surface, which—for an even number of n—has n / 2 double clamping grooves, with each double clamping groove consisting of two clamping grooves that are rotated by 180° relative to each other.

[0036] According to a further development of the invention, a second clamping geometry is additionally arranged on the second surface. This advantageously allows the cutting insert to be used on both sides. In particular, in addition to the cutting insert's ability to rotate—in particular n-fold—around the axis of symmetry, there is a further turning axis perpendicular to the axis of symmetry, around which the cutting insert can be turned. The cutting insert can thus be used for a particularly long time before it needs to be replaced.

[0037] In one embodiment, the second clamping geometry is identical or mirror-image to the first clamping geometry. Thus, for example, if there are n different clamping positions on the first surface, additional, in particular equivalent, n clamping positions are added on the second surface, so that the cutting insert has a total of 2n clamping positions.

[0038] In one embodiment, the cutting insert has a clearance angle of 0° on at least one cutting edge. Alternatively or additionally, the cutting insert is cylindrical, optionally with a polygonal base. However, a design of the cutting insert with two clamping geometries on the first and second surfaces is also possible, with the clearance angle deviating from 0°, particularly when the side surfaces of the cutting insert have a wedge geometry in longitudinal section, in particular with a minimum offset radially inward, i.e., in the direction of the symmetry axis.The object is also achieved by providing a clamping claw for clamping a cutting plate, in particular a cutting plate according to the invention or a cutting plate according to one or more of the previously described embodiments, wherein the clamping claw has a fastening section for fastening the clamping claw to a tool along a fastening direction—in particular determined by the fastening section—and a clamping section for clamping the cutting plate, wherein the clamping section encloses a fourth finite angle with an imaginary plane to which the fastening direction is perpendicular. In connection with the clamping claw, the advantages already described in connection with the cutting plate are realized in particular.The clamping claw advantageously allows clamping forces to be introduced into the cutting insert and the tool, which enables particularly stable fixation of the cutting insert, especially at high tool speeds, so that the arrangement of the cutting insert on the tool is particularly less susceptible to centrifugal forces. This, in turn, enables highly precise machining of workpieces. The clamping claw—especially in combination with the cutting insert according to the invention—also advantageously allows for a particularly space-saving arrangement on a tool, so that the clamping geometry does not interfere with the integration of cooling channels or other internal structures of the tool, or rather leaves sufficient space for this.

[0039] The clamping section is in particular designed to cooperate with the at least one clamping geometry, in particular with the clamping surface, in particular to engage in the at least one clamping groove.

[0040] In particular, the clamping section defines a contact line for contact with the clamping surface, whereby the contact line encloses the fourth angle with the imaginary plane.

[0041] According to a further development of the invention, the fourth angle is from 0.2° to 40°, in particular from 1° to 26°, in particular from 1.6° to 16°, in particular from 2° to 8°, in particular from 3° to 7°, in particular from 4° to 6°, in particular 5°. Alternatively or additionally, the fourth angle is twice as large as the first angle.

[0042] According to a further development of the invention, the clamping section has two clamping areas spaced apart from one another. In one embodiment, the two clamping areas correspond to the spaced apart, in particular separate, clamping areas of the clamping surface, with each clamping area being assigned to one of the clamping areas, interacting in particular with the correspondingly assigned clamping area. This advantageously effectively prevents unwanted point-like force introduction or highly asymmetrical tension, which can occur particularly in a continuous system due to tolerances or deviations.

[0043] In one embodiment, the clamping areas are separated from each other by a stand interruption.

[0044] In one embodiment, the distance interruption is designed as a spacing recess. This corresponds in particular to the interruption in the clamping surface. In particular, the interruption in the clamping surface and the spacing recess are coordinated in such a way that the raised interruption in the clamping surface engages the spacing recess when the cutting insert is attached to a tool by means of the clamping claw.

[0045] The object is also achieved by providing a tool with an insert seat for clamping a cutting insert, in particular a cutting insert according to the invention or a cutting insert according to one or more of the previously described embodiments, wherein the insert seat has a base surface and two contact surfaces inclined on the base surface, wherein the contact surfaces enclose a fifth, acute angle with one another such that a V-shaped opening receiving space for the cutting insert is created. In particular, the advantages already described above in connection with the cutting insert or the clamping claw are realized in connection with the tool. Advantageously, the tool is particularly less susceptible to the effects of centrifugal forces on the seat of the cutting insert, even at high speeds.Another advantage of the tool is that it has an optimized geometry with sufficient space for the integration of cooling channels or other internal structures, whereby the arrangement of the cutting plate including a clamping claw required for clamping leaves sufficient space for this.

[0046] In one embodiment, the contact surfaces are perpendicular to the floor surface.

[0047] According to a further development of the invention, the receiving space opens in the direction of a rotational axis of the tool. This advantageously leads to particularly stable contact of the cutting insert even at high speeds and thus particularly good support against centrifugal forces. In one embodiment, the cutting insert is pre-tensioned particularly firmly by the clamping claw against a first, radially outer contact surface of the contact surfaces and is increasingly pressed against this first contact surface as the speed increases. Alternatively or additionally, an angle bisector of the two contact surfaces extends at least substantially in the direction of the rotational axis, preferably in the direction of the rotational axis.

[0048] According to a further development of the invention, the insert seat has a fastening receptacle for fastening the fastening section of the clamping claw in the fastening receptacle, wherein the fastening receptacle is arranged relative to the contact surfaces such that the cutting insert is pulled by the clamping claw in the direction of the contact surfaces converging at the fifth angle - in one embodiment, preloaded particularly strongly against the first, radially outer contact surface - when the cutting insert is fastened to the insert seat with the clamping claw. This advantageously results in a particularly stable fit of the cutting insert in the insert seat, especially at high speeds, as well as a particularly space-saving integration of the clamping claw in particular, so that sufficient space remains for internal structures such as, for example, coolant channels.

[0049] In one embodiment, the fastening receptacle is arranged relative to the contact surfaces in such a way that the cutting plate is pulled centrally, in particular substantially along the angle bisector between the contact surfaces, in particular along the angle bisector, against the contact surfaces by the clamping claw.

[0050] According to a further development of the invention, the tool comprises at least one cutting insert according to the invention or a cutting insert according to one or more of the previously described embodiments. In particular, the cutting insert is arranged in the insert seat. Furthermore, the tool comprises at least one clamping claw according to the invention or a clamping claw according to one or more of the previously described embodiments. In particular, the cutting insert is attached to the tool by means of the clamping claw, in particular clamped or fixed in the insert seat.

[0051] The invention is explained in more detail below with reference to the drawings, which show:

[0052] Figure 1 is a first isometric view of a first embodiment of a cutting insert;

[0053] Figure 2 shows a second representation of the cutting plate according to Figure 1 in plan view;

[0054] Figure 3 is a schematic representation of a second embodiment of the cutting plate and, at the same time, a construction of the clamping geometry of the first embodiment of the cutting plate according to Figure 1; Figure 4 is a first sectional view of the cutting plate according to Figure 3 along a section line AA;

[0055] Figure 5 shows a second sectional view of the cutting plate according to Figure 3 along a section line BB;

[0056] Figure 6 shows a first representation of an embodiment of a clamping claw;

[0057] Figure 7 shows a second representation of the clamping claw according to Figure 6, and

[0058] Figure 8 is a representation of an embodiment of a tool with the first embodiment of the cutting plate according to Figure 1 and the embodiment of the clamping claw according to Figure 6.

[0059] Fig. 1 shows a first isometric view of a first embodiment of a cutting plate 1.

[0060] The cutting insert 1 for interchangeable clamping in a tool 3 shown in Figure 8 has a first surface 5 and a second surface 7 opposite the first surface 5 along a thickness direction - which in Figure 2 is perpendicular to the image plane. A first clamping geometry 9 for clamping the cutting insert 1 in the tool 3 is arranged at least on the first surface 5. The first clamping geometry 9 has at least one clamping surface 11 which extends along a clamping surface longitudinal direction L. Two - imaginary - clamping points S1, S2, which are arranged at a distance from one another on a projection line P, wherein the projection line P results from projecting an imaginary straight line oriented parallel to the clamping surface longitudinal direction onto the clamping surface 11, have different distances from an imaginary reference plane 13, wherein the thickness direction is perpendicular to the reference plane 13.

[0061] In particular, the clamping geometry 9 in the embodiment shown here has six clamping surfaces 11, of which only one is marked with the corresponding reference symbol for the sake of clarity.

[0062] The reference plane 13 is an imaginary plane to which an axis of symmetry A of the cutting insert 1, extending in the thickness direction, is perpendicular. The axis of symmetry A here is a 6-fold rotational symmetry axis of the cutting insert, which results, on the one hand, from the design of the first clamping geometry 9 as a clamping star and, on the other hand, from n = 6 cutting corners 15 formed on the cutting insert 1, whereby, for the sake of clarity, only one of the cutting corners 15 is identified by the corresponding reference numeral. The six cutting corners 15 all lie in the reference plane 13. In particular, the first surface 5 lies in the reference plane 13 here. Any two immediately adjacent cutting corners 15 are connected to one another by a geometrically defined cutting edge 21.Thus, the cutting plate 1 has six cutting edges 21, of which only one is provided with the corresponding reference symbol for the sake of clarity.

[0063] In the embodiment shown here, the first clamping geometry 9 has a clamping groove 17 recessed into the first surface 5, with the clamping surface 11 being formed as the groove base of the clamping groove 17. The clamping surface longitudinal direction L is simultaneously a groove longitudinal direction of the clamping groove 17. For the sake of simplicity of illustration, only two clamping grooves 17 are provided with the corresponding reference numerals here.

[0064] Due to the particularly 6-fold rotationally symmetrical arrangement of the clamping grooves 17, also referred to as single clamping grooves, a clamping star is formed on the first surface 5, which has three double clamping grooves 19, wherein each double clamping groove 19 is formed from two clamping grooves 17, a first clamping groove 17.1 and a second clamping groove 17.2, which are rotated by 180° to each other.

[0065] In a manner not explicitly shown here, a second clamping geometry is additionally arranged on the second surface 7, which is hidden from the viewer. The second clamping geometry can be identical to or a mirror image of the first clamping geometry 9.

[0066] In the embodiment shown here, the cutting insert 1 has a clearance angle of 0° at each of its six cutting edges 21. The cutting insert 1 is cylindrical with a hexagonal base.

[0067] Fig. 2 shows a second representation of the cutting plate 1 according to Figure 1 in plan view.

[0068] Identical and functionally identical elements are provided with the same reference symbols in all figures, so that reference is made to the preceding description in each case.

[0069] The at least one clamping surface 11 has an interruption 23 arranged along the longitudinal direction L of the clamping surface, so that the at least one clamping surface 11 has two clamping areas 25 separated from one another by the interruption 23: a first clamping area 25.1 and a second clamping area 25.2. In particular, one of the clamping points S1, S2 is located in each of the clamping areas 25.1, 25.2. The interruption 23 is arranged centrally along the longitudinal direction L of the clamping surface. In particular, the interruption 23 functions as a chip deflector during the machining of a workpiece using the cutting insert 1.

[0070] The interruption 23 is designed as an undamaged region arranged centrally in the at least one clamping groove 17, quasi as a type of island or elevation in the clamping groove 17. In this case, a surface 27 of the interruption 23 is arranged in the direction of the axis of symmetry A at the level of the first surface 5 and parallel to the first surface 5.

[0071] Fig. 3 shows a schematic representation of a second embodiment of the cutting insert 1. At the same time, Fig. 3 schematically shows a construction of the clamping geometry 9 of the first embodiment of the cutting insert 1 according to Fig. 1. In the second embodiment, only one clamping surface 11 and, accordingly, only one clamping groove 17 are shown. The 6-fold clamping star with three double clamping grooves 19 according to Fig. 1 is obtained by copying the clamping groove 17 shown five times and simultaneously rotating it by 60° each time around the axis of symmetry A.

[0072] The clamping surface 11, in particular the clamping groove 17, has a width BR measured perpendicular to the clamping surface longitudinal direction L and varying along the clamping surface longitudinal direction L. The width BR increases, preferably linearly, from a first end 29 of the clamping surface 11 to a second end 31 of the clamping surface 11 opposite the first end 29 along the clamping surface longitudinal direction L.

[0073] Figure 3 also shows an inclination axis N, as well as a first section line AA extending along the longitudinal direction L of the clamping surface, and a second section line BB perpendicular to the longitudinal direction L of the clamping surface. The imaginary inclination axis N is perpendicular to the longitudinal direction L of the clamping surface.

[0074] Fig. 4 shows a first sectional view of the cutting plate 1 according to Figure 3 along the first section line AA from Figure 3.

[0075] The clamping surface 11 is inclined relative to the reference plane 13 about the imaginary inclination axis N by a first finite angle α. The clamping surface 11 is thus inclined relative to the reference plane 13, in particular along the clamping surface longitudinal direction L, in particular, it slopes downward relative to the reference plane 13 along the clamping surface longitudinal direction L. In particular, the clamping surface 11 is deeper at the second end 31 in the direction of the symmetry axis A with respect to the reference plane 13 than at the first end 29, i.e., the clamping groove 17 is deeper at its second end 31 than at its first end 29.

[0076] The first angle is preferably from 0.1° to 20°, preferably from 0.5° to 13°, preferably from 0.8° to 8°, preferably from 1° to 4°, preferably from 1.5° to 3.5°, preferably from 2° to 3°, particularly preferably 2.5°.

[0077] Returning to Figure 3, the cutting insert 1 has two cutting corners 15 of the cutting corners 15 that are diametrically opposed to one another along an imaginary connecting line V, wherein the clamping surface longitudinal direction L of the clamping surface 11 encloses a second finite angle ß with the imaginary connecting line V. The second angle ß is preferably from 0.1° to 55°, preferably from 4° to 21°, preferably from 5° to 20°, particularly preferably 14° or 16°.

[0078] Fig. 5 shows a second sectional view of the cutting plate 1 according to Figure 3 along the second section line BB from Figure 3.

[0079] It can be seen that an imaginary measuring line M on the clamping surface 11 running perpendicular to the longitudinal direction L of the clamping surface encloses a third finite angle y with the reference plane 13, which angle is preferably from 0.1° to 45°, preferably from 1° to 35°, particularly preferably 25°.

[0080] Fig. 6 shows a first representation of an embodiment of a clamping claw 33.

[0081] The clamping claw 33 is configured to clamp the cutting plate 1 according to Figure 1 or Figure 3 to the tool 3. It has a fastening section 35 for fastening the clamping claw 33 to the tool 3 along a fastening direction C determined by the fastening section 35 and a clamping section 37 for clamping the cutting plate 1. The clamping section 37 is configured to cooperate with the clamping surface 11, in particular to engage in the at least one clamping groove 17.

[0082] The clamping section 37 has two spaced-apart clamping areas 39, a first clamping area 39.1 and a second clamping area 39.2. The clamping areas 39.1, 39.2 correspond to the separate clamping areas 25.1, 25.2 of the clamping surface 11, wherein each clamping area 39 is assigned to and interacts with one of the clamping areas 25. The clamping areas 39.1, 39.2 are separated from one another by a spacing interruption 41, wherein the spacing interruption 41 is designed as a spacing recess and corresponds in particular to the raised interruption 23 of the clamping surface 11, so that the interruption 23 engages in the spacing interruption 41 when the cutting insert 1 is fastened to the tool 3 by means of the clamping claw 33.

[0083] Fig. 7 shows a second representation of the clamping claw 33 according to Figure 6.

[0084] The clamping section 37 encloses a fourth finite angle 5 with an imaginary plane E, to which the fastening direction C is perpendicular. In particular, the clamping section 37 defines an imaginary - interrupted - contact line AL for contact with the clamping surface 11, wherein the contact line encloses the fourth angle 5 with the imaginary plane E. The fourth angle is preferably from 0.2° to 40°, preferably from 1° to 26°, preferably from 1.6° to 16°, preferably from 2° to 8°, preferably from 3° to 7°, preferably from 4° to 6°, particularly preferably 5°. In the illustrated embodiment, the fourth angle 5 is twice as large as the first angle a.

[0085] Fig. 8 shows an illustration of an embodiment of the tool 3 with the first embodiment of the cutting plate 1 according to Figure 1 and the embodiment of the clamping claw 33 according to Figure 6.

[0086] The tool 3 has a plate seat 43 for clamping the cutting insert 1 according to Figure 1 or Figure 3, wherein the plate seat 43 has a bottom surface 45 and two contact surfaces 47, a first contact surface 47.1 and a second contact surface 47.2, arranged obliquely on the bottom surface 45. The contact surfaces 47 form a fifth, not explicitly shown, acute angle with each other such that a V-shaped receiving space 49 is created for the cutting insert 1. The receiving space 49 opens in the direction of a rotational axis D of the tool 3. In particular, an angle bisector (not shown) of the two contact surfaces 47 extends at least substantially in the direction of the rotational axis D. This makes the tool 3 particularly less susceptible to the effects of centrifugal forces on the seat of the cutting insert 1, which, particularly at high rotational speeds around the rotational axis D, presses firmly against the first, radially outer contact surface 47.1, against which it is already particularly strongly prestressed due to the design of the first angle a and the fourth angle 5. The contact surfaces 47 are perpendicular to the base surface 45.

[0087] The insert seat 43 also has a fastening receptacle 51—in particular, an internal threaded bore only indicated here—for fastening the fastening section 35 of the clamping claw 33 in the fastening receptacle 51. The fastening receptacle 51 is arranged relative to the contact surfaces 47 in such a way that the cutting insert 1 is pulled by the clamping claw 33 in the direction of the contact surfaces 47, which converge at the fifth angle, when the cutting insert 1 is fastened to the insert seat 43 with the clamping claw 33. This, in particular, ensures a highly stable fit of the cutting insert 1 in the insert seat 43, especially at high speeds of the tool 3 about the rotational axis D.

[0088] The fastening receptacle 51 is arranged relative to the contact surfaces 47 such that the cutting insert 1 is pulled centrally, in particular substantially along the angle bisector between the contact surfaces 47, against the contact surfaces 47 by the clamping claw 33, although the aforementioned particularly strong preload against the first contact surface 47.1 is preferably also achieved. This configuration, in particular, enables a particularly space-saving integration of the clamping claw 33 into the tool 3, leaving sufficient space for internal structures such as coolant channels.

Claims

CLAIMS 1. Cutting plate (1) for interchangeable clamping in a tool (3), wherein the cutting plate (1) has a first surface (5) and a second surface (7) opposite the first surface (5) along a thickness direction, wherein a first clamping geometry (9) for clamping the cutting plate (1) in the tool (3) is arranged at least on the first surface (5), wherein the first clamping geometry (9) has at least one clamping surface (11) which extends along a clamping surface longitudinal direction (L), and wherein two clamping points (S1, S2), which are arranged at a distance from one another on a projection line (P) of an imaginary straight line oriented parallel to the clamping surface longitudinal direction (L) onto the clamping surface (11), have different distances from an imaginary reference plane (13) to which the thickness direction is perpendicular.

2. Cutting plate (1) according to claim 1, wherein the first clamping geometry (9) has a clamping groove (17) recessed into the first surface (5), and wherein the clamping surface (11) is designed as a groove base of the clamping groove (17).

3. Cutting plate (1) according to one of the preceding claims, wherein the clamping surface (11) is inclined relative to the reference plane (13) by a first finite angle (α) about an imaginary inclination axis (N) oriented obliquely to the clamping surface longitudinal direction (L).

4. Cutting plate (1) according to claim 3, wherein the first angle (a) is from 0.1° to 20°, in particular from 0.5° to 13°, in particular from 0.8° to 8°, in particular from 1° to 4°, in particular from 1.5° to 3.5°, in particular from 2° to 3°, in particular 2.5°.

5. Cutting plate (1) according to one of the preceding claims, wherein the clamping surface (11) has a width (BR) measured perpendicular to the clamping surface longitudinal direction (L) and varying along the clamping surface longitudinal direction (L), wherein the width (BR) increases in particular starting from a first end (29) of the clamping surface (11) up to a second end (31) of the clamping surface (11) opposite the first end (29) along the clamping surface longitudinal direction (L).

6. Cutting plate (1) according to one of the preceding claims, wherein the at least one clamping surface (11) has an interruption arranged along the clamping surface longitudinal direction (L) (23), so that the at least one clamping surface (11) has two clamping regions (25) spaced apart from one another.

7. Cutting plate (1) according to one of the preceding claims, wherein the cutting plate (1) is polygonal with at least two cutting corners (15) diametrically opposite one another along an imaginary connecting line (V), wherein the clamping surface longitudinal direction (L) of the at least one clamping surface (11) encloses a second finite angle (ß) with the imaginary connecting line (V), which is in particular from 0.1° to 55°, in particular from 4° to 21°, in particular from 5° to 20°, in particular 14° or 16°.

8. Cutting plate (1) according to one of the preceding claims, wherein an imaginary measuring line (M) on the clamping surface (11) running perpendicular to the clamping surface longitudinal direction (L) encloses a third finite angle (y) with the reference plane (13), which angle is in particular from 0.1° to 45°, in particular from 1° to 35°, in particular 25°.

9. Cutting plate (1) according to one of the preceding claims, wherein the first clamping geometry (9) has n clamping surfaces (11), where n is a natural number greater than 1, and wherein the n clamping surfaces (11) are arranged distributed with n-fold rotational symmetry on the first surface (5).

10. Cutting plate (1) according to one of the preceding claims, wherein a second clamping geometry is additionally arranged on the second surface (7), which is optionally identical or mirror-inverted to the first clamping geometry (9).

11. Clamping claw (33) for clamping a cutting plate (1) according to one of claims 1 to 10, wherein the clamping claw (33) has a fastening section (35) for fastening the clamping claw (33) to a tool (3) along a fastening direction (C) and a clamping section (37) for clamping the cutting plate (1), in particular for engaging in the at least one clamping groove (17), wherein the clamping section (37) encloses a fourth finite angle (5) with an imaginary plane (E) to which the fastening direction (C) is perpendicular.

12. Clamping claw (33) according to claim 11, wherein the fourth angle (5) is from 0.2° to 40°, in particular from 1° to 26°, in particular from 1.6° to 16°, in particular from 2° to 8°, in particular from 3° to 7°, in particular from 4° to 6°, in particular 5°, or wherein the fourth angle (5) is twice as large as the first angle (α).

13. Clamping claw (33) according to one of claims 11 or 12, wherein the clamping section (37) has two clamping regions (39) spaced apart from one another, in particular separated from one another by a space interruption (41).

14. Tool (3) with a plate seat (43) for clamping a cutting plate (1) according to one of claims 1 to 10, wherein the plate seat (43) has a bottom surface (45) and two contact surfaces (47) arranged obliquely on the bottom surface (45), wherein the contact surfaces (47) enclose a fifth, acute angle with one another in such a way that a V-shaped opening receiving space (49) for the cutting plate (1) is created.

15. Tool (3) according to claim 14, wherein the receiving space (49) opens in the direction of a rotation axis (D) of the tool (3).

16. Tool (3) according to one of claims 14 or 15, wherein the plate seat (43) has a fastening receptacle (51) for fastening the fastening section (35) of the clamping claw (33) in the fastening receptacle (51), and wherein the fastening receptacle (51) is arranged relative to the contact surfaces (47) in such a way that the cutting plate (1) is pulled by the clamping claw (33) in the direction of the contact surfaces (47) converging at the fifth angle when the cutting plate (1) is fastened to the plate seat (43) with the clamping claw (33).

17. Tool (3) according to one of claims 14 to 16, with at least one cutting plate (1) according to one of claims 1 to 10, and with at least one clamping claw (33) according to one of claims 11 to 13.

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