WO2018172462A1

WO2018172462A1 - Star-type indexable cutting insert and tool system

Info

Publication number: WO2018172462A1
Application number: PCT/EP2018/057304
Authority: WO
Inventors: Uwe HENZLER
Original assignee: Ceramtec Gmbh
Priority date: 2017-03-24
Filing date: 2018-03-22
Publication date: 2018-09-27

Abstract

The invention relates to a tool system with a main part (1), a clamping element (2), and a cutting insert (3) for machining workpieces (7). The main part (1) has a recess (4), which forms an insert seat (25) for the cutting insert (3), in order to receive the cutting insert (3); the cutting insert (3) is secured in the insert seat (25) by the clamping element (2); and the cutting insert (3) has cutting edges (6a, 6b) on the circumferential surface (9) of the cutting insert. In order to substantially increase the adjustment angle (A) in the machining/advancing direction (20) towards the workpiece (7), shorten the engagement length of the cutting edge (6a, 6b) on the workpiece, and reduce the passive force (Fp) during the machining process, the circumference (9) of the cutting insert (3) is formed by protrusions (5) and recesses (16).

Description

Star indexable insert and tool system

The invention relates to a cutting plate for machining workpieces, wherein the cutting plate has cutting edges on its circumference and a tool system having a base body, a clamping element and a clamping means, wherein the base body has a recess with a plate seat for receiving the cutting plate and the cutting plate through the Clamping element is mounted in the recess on the insert seat.

Such a cutting tool is described in EP 2 823 921 A1. Specifically, an indexable insert having a regular polygonal shape with five to eight corners is fixed to one end of a tool base such that one of two adjacent sides of an outer peripheral surface serves as a rake face with a negative rake angle, the other of the two adjacent sides as a front one Flank surface serves; and an edge between the two adjacent sides serves as a cutting edge with a point angle. It is possible to swap the corners so that a total of 16 (8 ^* 2) cutting edges are available for an octagon indexable insert. The point angle is 135 ° for an octagon indexable insert.

An insert and a tool system are subject to high demands. These depend on the materials to be processed in conjunction with the process parameters such as feed rate, cutting depth and surface qualities to be produced.

The invention has for its object to improve an insert according to the preamble of claim 1 and a tool system according to the preamble of claim 1 1 to meet the increased process requirements. According to the invention, this object is achieved by the features of a cutting insert of claim 1 and by the features of a tooling system of claim 11.

An insert according to the invention has a significantly increased setting angle "A" (see Figure 4) The angle between the longitudinal axis of the workpiece to be machined and the cutting edge of the insert is referred to as the setting angle "A". This angular magnification according to the invention leads to a reduction of the engagement length of the cutting edge on the workpiece. As a result, the so-called passive force "Fp" (see Figure 4) is reduced during machining, when the insert is used, and these measures according to the invention result in a reduced load on the tool system, the workpiece and the processing machine In addition, the notch wear is minimized.When, in the following, an insert is meant, it always means an indexable insert which can have cutting edges both on its top side and on its bottom side.

The circumference of an insert according to the invention has in plan view the shape of a star (character or symbol) or gear. In this case, a star-shaped closed curve is to be understood, wherein the distances, starting from a center of the outer shape, the circumference, to the outer shape may have different amounts. A cuboid cutting plate has a star-shaped top and bottom, which are interconnected via a peripheral surface. The periphery of the insert may be formed by projections and recesses in the form of serrations or teeth. The projections and recesses may be uniformly distributed at equal distances from each other over the circumference. The number of projections and recesses may be identical or may differ from each other. The number of protrusions and recesses may be even or odd. For example, 2 + n where n = 2 or 1 + n where n = 2. Embodiments are also possible in which the distribution of the projections and recesses on the circumference takes place at irregular intervals. The circumferentially disposed projections and recesses may have identical dimensions, such as length, width, angle, etc. and are then formed symmetrically. However, it is also possible for example that the dimensions deviate from one another within a single projection or a recess, and thus the projections or the recesses deviate from a symmetry.

According to the invention, the insert has in each case five to ten, preferably eight, projections and recesses. The preferred embodiment, each having 8 protrusions and recesses, i. an octagon insert will be described in more detail. Eight projections provide an optimal embodiment with a maximum Einstellwinkelbereich from 55 ° to 85 ° and a cutting depth to 3 mm (see figure description).

The projections or the recesses may have rectilinear flanks which are arranged at an angle (B), a point angle (B) of 45 ° to 105 ° to each other. The rectilinear, arranged at an angle to each flanks formed as cutting edges go into a tip over. Since the flanks of the projections include a point angle (B) of 45 ° to 105 °, the star-like shape of the insert results. The arrangement according to the invention of the cutting edges (flanks) of the projections significantly increases the setting angle "A" in the direction of the machining movement towards the workpiece (see figures and associated description) In addition, this reduces the length of engagement of the cutting edge on the workpiece same working conditions reduces the passive force "Fp". This in turn has a positive influence on the friction that is reduced and the associated lower notch wear. Overall, the Use of an insert according to the invention reduces the load on the tool, the workpiece and the machine and increases the service life of the insert.

In a specific embodiment, the flanks may have shapes that deviate from rectilinear flanks. The flanks can be concave, convex or curve, for example, formed as a spline. Regardless of their shape, the flanks are always at an angle to each other, which includes a range of 45 ° to 105 ° as described above.

An insert according to the invention may be formed as an indexable insert, whereby the number of usable cutting is doubled. It then has cutting edges on its top and bottom. For example, should the cutting edges of the top be worn, the insert may be rotated 180 degrees to use the cutting edges of the bottom. In an indexable insert top and bottom are identical. An insert may preferably be made of cubic boron nitride (CBN) or polycrystalline cubic boron nitride (PCBN) or a sintered ceramic such as alumina ceramic or silicon nitride ceramic or SiAlON ceramic. This is described, for example, in WO 2005/021 192 A1.

The insert, like all inserts, has a top and a bottom. At the top or bottom, at least one trough can be arranged or these top or bottom are made smooth. A smooth trained Oberbzw. Bottom, has no depression or elevation. A smooth surface is understood to mean a planar planar surface. If the upper side or the lower side has a depression, this has the advantage of better centering of the cutting plate during clamping and can prevent the cutting plate from flying out of its insert seat in the tool base body.

In a preferred embodiment, a first trough is arranged on the top and bottom, which has an annular recess with a bottom. This bulge passes over an annular surface from the bottom to the top or bottom. In one embodiment, the protrusion may include a protuberance having its tip above the bottom of the well and below the top or bottom. This trough (described in WO 03/013770 A1) is used for positive fixing and tension of the cutting plate on the main body of the tool. Especially for drawing cuts, in which the cutting plate could be pulled out of its seat by the acting cutting forces, this cutting plate with the special trough offers itself. For further description of this trough see the cited document. The aforementioned annular surface can be designed as a cone, basket arch lowering or dome shape. It may also be a flat, arranged at an angle to the top or bottom ring surface.

In addition to the clamping recess described, a second clamping recess may be arranged coaxially with the first clamping recess, wherein the first clamping recess are arranged lower than the second clamping recess and both lower than the top or bottom. This is described in EP 1 536 903 A. When clamping this insert in the main body, the clamping element rests on the second clamping recess and, for example, engages with a nose in the first clamping recess. The distance from the contact surface of the clamping element to the trough is thus always constant and is not dependent on laser, lapping or grinding of the cutting top surfaces.

In an embodiment of the tool system according to the invention in which a previously described cutting insert according to the invention is arranged, the main body of the tool system has a recess which is delimited by a plate seat and contact surfaces. The contact surfaces of the recess are shaped so that they form an undercut. These contact surfaces of the undercut engage in the spaces between two adjacent projections of a cutting plate and fix the cutting plate repeatable safe in the base body of the tool system. A flying out of the insert during operation is characterized prevented. A secure holding the cutting plate during operation is ensured by the contact surfaces of the undercut in the main body of the tool system. The undercut is an additional securing means to a recess of an insert and is also particularly useful for a cutting insert with a smooth upper and lower side. The undercut of the recess ensures the repeatable positionally accurate holding the cutting plate regardless of whether it has a trough or a smooth top.

In addition to the above-described undercuts, the recess may have further contact surfaces with which the positioning of a cutting plate can be ensured. These contact surfaces may be formed in the form of projections which engage in a recess of a cutting plate. The result is an additional positive connection in the form of tongue and groove between the recess and the cutting plate. Depending on the requirements, a tool system according to the invention can have a plurality of these positive connections.

The contact surfaces are preferably lugs which almost completely fill the interstices of two adjacent projections or teeth of a cutting insert. Adjacent is understood to mean adjacent to the circumference or peripheral surface. In an alternative embodiment of the tool system according to the invention, the above-described recess is formed with the undercut in an adapter. The adapter is fixed in a fixed position in a recess on the base body of the tool system. This allows a uniform recess in the main body of a tool system regardless of the outer shape, ie, the number of projections and recesses of a cutting plate. This creates a uniform interface between body and adapter. At this interface, ie in this recess, various adapters whose outer shape is formed congruent to the recess in the base body, attached become. The recess, the interface, may have a shape which deviates from the recess which receives the cutting plate. The recess in the adapter itself can then be provided with undercuts, which are formed congruent to the outer shape of the insert used. Thus, it is possible to accommodate in a basic body with a uniform recess differently shaped adapter, which in turn can accommodate different inserts with different numbers of projections and recesses. For example, it is possible for an adapter to receive a star-shaped insert with, for example, four projections and another adapter for a star-shaped insert with, for example, eight projections in the same recess of a base. Both adapters have an outer shape that is congruent with the shape of the recess in the main body of the tool. However, the shape of the recess in the adapter in which the insert is received differs. In an adapter, this shape of the recess on a cutting plate with four projections and recesses and in the other case, this shape of the recess is adapted to a cutting plate with eight projections and recesses.

An insert according to the invention has a longitudinal axis. This is transversely, preferably arranged at an angle of 90 degrees to the top or bottom of the cutting plate. The cutting plate is pushed into the recess in the direction of its longitudinal axis, in other words it is inserted from "above." The cutting insert is pushed into the recess of the main body until it rests against the insert seat the recess are inserted. The direction from the "front" would be perpendicular to the longitudinal axis of the cutting insert in the direction of the workpiece so that the protrusions of the main body can engage between the protrusions of the cutting insert, the cutting insert must be positioned over the protrusions to be engaged and then inserted fill the recesses of two adjacent projections of the insert almost completely. The insertion direction of the insert is limited by the insert seat. The insert seat may preferably be a surface of the main body. Then, the recess, wherein the insert seat is a part of this recess, bounded by contact surfaces of the body. To compensate for manufacturing tolerances, a support can be arranged in the recess. This support then lies with its underside against the insert seat, its upper side forming the contact surface for a cutting insert according to the invention. If a base body has a support, then the direction of insertion of an insert is limited by the upper side of the support. The depth of the recess in a base body of the tool system in which a support is arranged is generally greater by the height of the support than the depth of a recess in which no support is provided.

LIST OF REFERENCE NUMBERS

The invention will be further explained with reference to figures. It shows

Figurl: an excerpt of the Werkzeugsystenns, comprising a

Main body, an insert, a clamping element and a

Clamping means in extracts and in a schematic representation,

Figure 2 shows a detail of the tool system according to Figure 1 without

Clamping element in a schematic representation, 3 shows an enlarged detail of Figure 2 in a schematic

Presentation,

4 shows an inventive cutting plate according to the figures 1 to 3 with two wells in plan view in a schematic representation, Figure 5: the cutting plate according to Figures 4 with two wells in plan view of an upper side of the cutting insert fitted in a recess 4 of the main body of a tool system in a schematic Presentation,

Figures 6a to 6d: different embodiments of a cutting plate according to

FIG. 5 in a schematic representation,

FIG. 7 shows the cutting plate according to FIG. 4 without troughs in a plan view of an upper side of the cutting insert fitted in a recess of the main body of a tool system in a schematic representation and FIG

Figure 8: the main body of a tool system according to the invention with a recess which is adapted to receive an adapter, wherein the adapter is a recess for receiving a cutting plate according to the invention is formed on, in part and in a schematic representation.

FIG. 1 shows the tool system according to the invention, or the front part of a base body 1 of the tool system facing the workpiece 7 (FIG. 4). On the base body 1, a clamping element 2 is fastened with a tensioning means 18. The clamping element 2 presses with a projection in the form of a nose an inventive star indexable insert 3, hereinafter referred to as cutting plate 3, in a recess 4 in the base body first The cutting plate 3 is arranged in the recess 4 of the base body 1 and rests on a plate seat 25. The cutting plate 3 will be described in more detail below. Here only so much that the cutting plate 3 has the outer shape of a star (character) or gear, wherein in the embodiment of Figure 1, the circumference or the peripheral surface 9 of uniformly distributed over the circumference identical projections 5 with two rectilinear flanks 6a , 6b is formed. The flanks 6a, 6b go cutting edges forming in the top 10 (Figure 3) via. See in particular the sections in Figures 2 to 4.

FIG. 2 shows a detail from FIG. 1 without a tensioning element 2. The recess 4 with the plate seat 25 on the base body 1 can be clearly seen. The recess 4 has projecting projections in the form of lugs 17, which serve as contact surfaces for the cutting plate 3. These lugs 17 engage in the recesses 16 of two adjacent projections 5 of the cutting plate 3 and thus prevent ejection of the cutting plate 3 in use. The cutting plate 3 can not be pushed from "front" in the recess 4, but is used from "top" until it rests with its bottom on the insert seat 25. The sliding direction of "front" would be perpendicular to the longitudinal axis of the cutting plate 3. In order for the protrusions 17 of the base body 1 to be able to grip between the protrusions 5 of the cutting plate 3, the cutting plate 3 must be positioned over the protrusions 17 to be engaged and subsequently inserted Projections 17 can fill the recesses 16 of two adjacent projections 5 of the cutting plate 3 almost completely.

Figure 3 shows an enlarged detail of Figure 2. The two cantilevered projections 17 on the recess 4 have at their ends an orifice and form a constriction in this area. The cutting plate 3 is inserted into the recess from above and can not escape "forwardly" due to the narrowed orifice 3. The cutting plate 3 shown in Figures 1 to 3 has a smooth upper surface 15, ie has no depression on the upper side or the surface Otherwise, the same reference numerals also show the same features.

Figure 4 shows the cutting plate 3 according to Figures 1 to 3 with two wells 1 1 a, 1 1 b in plan view of an upper side 15 of the cutting plate 3 in engagement with a workpiece 7. The cutting plate 3 has the outer shape of a star, it is meant the character or the symbol, or a gear. On the peripheral surface 9 evenly distributed over the circumference eight identical projections 5 in the form of teeth, each with two rectilinear flanks 6a, 6b formed, which include a point angle B to each other. According to the invention, this point angle B is between 45 ° and 105 °. The distance between the tip 10 and the intersection point p of two cutting edges 6a and 6b of two adjacent projections 5 forms the length of a flank 6a, 6b. The flanks 6a, 6b of the projections 5 form cutting edges forming in the top 10 of the projections 5 over. The flanks 6a, 6b are formed as cutting edges at least in the region of the tip 10. The cutting edges can be formed over the entire length of the flanks 6a, 6b. You can also extend from the top 10, only portions of the flanks 6a, 6b. These ranges may be from 100% to 50%, preferably 100% to 75% of the length of the flanks 6a, 6b. In Figure 4, eight teeth 5 are shown. The dashed line 21 shows the outer contour of a standard octagonal cutting insert with a point angle B of 135 °. The invention of the cutting plate 3 presented here is the much smaller point angle B, which reduces the total load on the tool, the workpiece and the machine and increases the service life of the insert 3 due to reduced friction and thus the notch wear is minimized.

The workpiece 7 is shown schematically in FIG. The arrow 20 indicates the feed direction of the tool or the cutting plate 3. The setting angle is marked A and the passive force in the machining process is Fp.

The cutting plate of Figure 4 shows, in contrast to the cutting plate according to Figures 1 to 3, a first trough 1 1 a on the top 15. If, as already mentioned, is spoken by a cutting plate, so always an indexable insert is meant, which also on its underside a trough 1 1 a may have. The trough 1 1 a is circular and has a bottom 12 which merges via an annular surface 22 in a second recess 1 1 b. In the middle the first well 1 1 a is a survey 13, the tip 14 is below the top 15 of the cutting plate 3 and preferably below the second trough 1 1 b.

The annular surface 22 may be designed conically as a basket arch depression or as Kalottenform or as a flat surface. The annular surface 22 may be arranged at an angle to the top 15.

For clamping on the base body 1, the clamping element 2 engages with adapted shaped nose positively in the first recess 1 1 a of the cutting plate 3 (not shown). This trough 1 1 a is used for positive clamping on a base body 1 of a tool system. Especially for drawing sections, in which the cutting plate 3 could be pulled out of its seat by the acting cutting forces, this trough 1 1 a offers great advantages in terms of the fixation of the cutting plate. 3

In order that lapping or grinding operations of the upper side 15 of the cutting plate 3 do not affect the fixing or clamping properties of the cutting plate 3, a second depression 1 1 b is arranged coaxially with the first depression 1 1 a, the first depression 1 1 a being deeper than the second depression 1 1 a Trough 1 1 b and both lower than the top 15 are arranged (Figure 4). When clamping this cutting plate 3, the clamping element 2 is located on the second trough 1 1 b and engages, for example with a nose in the first trough 1 1 a. The distance from the support surface of the clamping element to the trough 1 1 a is thus always constant and is not dependent on lapping or grinding operations of the top 15 of the cutting edge. 3

The cutting plate 3 may be made of PCBN or of CBN or of a sintered ceramic such as alumina ceramic or silicon nitride ceramic or SiAlON ceramic. The corresponding contour of the cutting plate 3 and also the troughs 1 1 a, 1 1 b can be produced for example by means of laser processing or via a corresponding shaping of the green body. The green body thus produced is then dried and sintered. The cutting plate 3 may be provided with a coating.

FIG. 5 shows the cutting plate 3 according to FIG. 4 with two clamping recesses 11a, 11b in a plan view of an upper side 15 of the cutting plate 3. The recess 4 in the main body 1 of the tool system can be seen. The projections 17 in the form of lugs 17 engage in the recesses 16, in the interstices of the projections 5 of the cutting plate 3 a. The arrow 23 indicates the direction of the withdrawal of the clamping element 2 and the cutting plate 3. See the preceding figures. The withdrawal shown causes the flank pointing in the direction of the workpiece 7, in this case 6a, to rest against the facing contact surface 24 of the projection 17. With ap, the depth of cut is designated, which is a maximum of 2.68 mm in this embodiment, which has a point angle of 75 °. The setting angle A is 70 °. Two flanks 6b, 6a of two adjacent projections 5a, 5b in this embodiment form an angle of 120 °.

FIGS. 6a to 6d show a cutting plate 3 according to the invention, in alternative embodiments. The maximum possible cutting depths ap are dependent on the respective tip angle B.

The cutting plate 3 according to FIG. 6a has an insertion angle A of 85 °, with a point angle B of 45 ° and a maximum cutting depth ap of 3.08 mm. Two flanks 6b, 6a of two adjacent projections 5a, 5b in this embodiment form an angle of 90 °.

The cutting plate 3 according to FIG. 6b has a setting angle A of 75 °, with a point angle B of 65 ° and a maximum cutting depth ap of 2.79 mm. Two flanks 6b, 6a of two adjacent projections 5a, 5b in this embodiment form an angle of 110 °. The cutting plate 3 according to FIG. 6c has a setting angle A of 65 °, with a point angle B of 85 ° and a maximum cutting depth ap of 2.58 mm. Two flanks 6b, 6a of two adjacent projections 5a, 5b in this embodiment form an angle of 130 °.

The cutting plate 3 according to FIG. 6d has a setting angle A of 55 °, with a point angle B of 105 ° and a maximum cutting depth ap of 2.38 mm. Two flanks 6b, 6a of two adjacent projections 5a, 5b in this embodiment form an angle of 150 °.

The above-described embodiments are embodiments of an insert according to the invention. The setting angle A, the point angle B and the depth of cut ap can be adapted to the required process conditions within the meaning of the invention and deviate from the values described above.

FIG. 7 shows another embodiment of a main body 1 of a tool system according to the invention. Insofar as the features of this embodiment are identical to those described above, the same reference numerals and the above description apply. The exemplary embodiment according to FIG. 7 has additional projections 27 in addition to the projections 17. As a result, the shape of the recess 4, in one area, corresponds to the shape of the peripheral surface 9 of the cutting plate 3. The projections 27 serve as additional positioning aids of a cutting plate 3 according to the invention. Embodiments are also possible which do not have any except in the region of the recess 4 further projections 27 or only one further projection 27 or at least one or more projections 27 have. The number of additional projections or positioning aids 27 is dependent on the requirements for the positioning of the cutting plate 3. FIG. 8 shows a further embodiment of an inventive device

Tool system. Insofar as the features of this embodiment are identical to those described above, the same reference numerals and the above description apply. The recess 4 in the base body 1 is formed to a Adapters 26 record. The adapter 26 may be attached to the base body 1 with known fastening means (not shown). The outer shape of the adapter 26 is formed congruent to the shape of the recess 4. The shape of the recess 4 may differ from the shape described above, because it does not take a cutting insert 3 according to the invention but an adapter 26. The adapter 26 itself has a recess 4 ', which is designed to receive a cutting plate according to the invention. Accordingly, the description of the recess 4 according to Figures 1 to 3, 5 and 7 applies to the recess 4 'of the adapter 26. The recess 4' also has projections 17 which form an undercut about an inserted cutting plate 3 transversely to its longitudinal axis in Hold position. For this purpose, the contact surfaces 24 are operatively connected to the flanks 6a, 6b. In a main body 1 of a tool system according to Figure 8 different adapters with different recesses 4 'can be positioned. The recesses 4 'may be congruent with various forms of cutting plates 3, for example cutting plates 3 according to FIGS. 6a to 6d. In this case, the various adapters 26 have identical outer shapes. Thus, it is possible to position a plurality of adapters with identical outer shapes and different shapes of the recess 4 ', in which different cutting inserts 3 according to the invention can be accommodated, in a unitary basic body 1. The result is a tool system according to the invention for various star-shaped cutting plates 3 according to the invention.

The invention relates to a tool system comprising a base body 1, a clamping element 2 and a cutting plate 3 for machining workpieces 7, wherein the base body 1 has a recess 4 with a plate seat 25 for receiving the cutting plate 3, the cutting plate 3 by the clamping element 2 in the recess 4 is mounted on the insert seat 25 and the cutting plate 3 at its periphery 9 Schneidkanten6, 6a, 6b has.

Thus, the setting angle (A) in the processing A / orschubschub (20) to the workpiece (7) is significantly increased, the engagement length of the cutting edge (6a, 6b) on Workpiece becomes shorter and the passive power (Fp) is reduced in the machining process, the invention proposes that the circumference (9) of the cutting plate (3) by at least two projections (5) and at least two recesses (16) is formed.

Claims

claims

1 . Cutting tool (3) for a tool system, wherein the cutting insert has at least two recesses (16) to be positioned in the tool system, and wherein the cutting insert has flanks (6a, 6b) at its periphery (9) forming the cutting edges (6a, 6b) having the tip (10), characterized in that the periphery (9) of the cutting plate (3) by projections (5) and recesses (16) is formed and has the shape of a star or gear.

2. Cutting plate (3) according to claim 1, characterized in that the projections (5) and recesses (16) are arranged in the same or at equal intervals on the circumference (9) of the cutting plate (3).

3. cutting plate (3) according to claim 1, characterized in that the two flanks (6a, 6b) are formed in a straight line.

4. Cutting insert (3) according to claim 1, characterized in that the two flanks (6a, 6b) are arranged at an angle (B) to each other and that the range of the angle (B) 45 ° to 105 °.

5. cutting insert (3) according to claim 1 and 2, characterized in that the cutting plate (3) has five to ten, preferably eight projections (5).

6. cutting plate (3) according to claim 1 and 2, characterized in that the cutting plate (3) has five to ten, preferably eight recesses (5).

7. Cutting insert (3) according to one of the preceding claims, characterized in that the cutting plate (3) is formed as an indexable insert and made of cubic boron nitride (CBN) or polycrystalline cubic boron nitride (PCBN) or a sintered ceramic such as alumina ceramic or Silicon nitride ceramic or SiAlON ceramic exists.

8. cutting insert (3) according to one of the preceding claims, characterized in that the cutting plate (3) has a top (15) and a bottom, on each of which at least one trough (1 1 a, 1 1 b) is arranged / are, wherein a first trough (1 1 a) is an annular recess with a bottom (12), the bulge passes over an annular surface from the bottom (12) in the upper (15) or bottom and the bulge a survey (13) encloses whose tip (14) above the bottom (12) and below the top (15) or bottom.

9. cutting insert (3) according to claim 8, characterized in that coaxially with the first trough (1 1 a) a second trough (1 1 b) is arranged, wherein the first trough (1 1 a) deeper than the second trough (1 1 b) and both are arranged lower than the upper (15) or lower side.

10. cutting insert (3) according to claims 1 to 7, characterized in that the cutting plate (3) has a top (15) and a bottom, which is smooth, executed without recess or increase / are.

1 1. Tool system comprising a base body (1), a clamping element (2), a chip removal means (18) and a cutting plate (3) according to claims 1 to 10 for machining workpieces (7), wherein the base body (1) has a recess (4 ) with a plate seat (25) for receiving the cutting plate (3), and the cutting plate (3) from the clamping element (2) and the clamping means (18) in the recess (4) is fixed.

12. Tool system according to claim 1 1, characterized in that the recess (4) receives an adapter (26), wherein the adapter (26) has a recess (4 ') with a plate seat (25) for receiving the cutting plate (3) and the cutting plate (3) from the clamping element (2) and the clamping means (18) in the recess (4 ') of the adapter is attached.

13. Werkzeugsystenn according to claim 1 1 and 12, characterized in that the recess (4, 4 ') formed as an undercut contact surfaces (24) which engage in the recesses (16) of two adjacent projections (5) of a cutting plate (3) and so a secure holding the cutting plate (3) is enabled in operation.

14. Tool system according to claim 13, characterized in that the contact surfaces (24) projections in the form of lugs (17) which fill the intermediate spaces (16) of two adjacent projections (5) of the cutting plate (3) almost completely.