EP2836326A1

EP2836326A1 - Cutting insert and cutting tool

Info

Publication number: EP2836326A1
Application number: EP13718531.0A
Authority: EP
Inventors: Bruno Teusch
Original assignee: Guehring KG
Current assignee: Guehring KG
Priority date: 2012-04-13
Filing date: 2013-04-12
Publication date: 2015-02-18
Also published as: DE102012103246A1; WO2013153213A1

Abstract

The invention relates to a cutting insert (20) for a cutting tool for machining workpieces, which cutting insert has a contact face (24) and a rake face (22) that is opposite the contact face in a plane-parallel manner and has the same basic geometric shape, on which rake face at least one cutting edge (28) is formed. According to the invention, in a top view of the rake face (22), the at least one cutting edge (28) is angled outward by a predetermined angle delta relative to the corresponding edge of the contact surface, while all other outer edges of the rake face (22) extend parallel to the corresponding edges of the bottom face (24). The service life of the cutting insert (20) can thereby be increased.

Description

description

Cutting insert and cutting tool

The present invention relates to a cutting insert for a cutting tool for machining workpieces, the cutting tool itself and a rotary driven tool with at least one cutting edge for cutting

Machining or production of a defined workpiece surface.

In machining technology, a wide variety of processes and tools are used for machining workpieces. However, everyone is

Cutting tools in common that despite great progress in the

Material technology and the use of ever better materials, the service life of the cutting tools due to wear on the cutting edge, in particular a wear-related change in the cutting edge geometry is limited. Prior to the complete replacement of the tool or the cutting insert are from the prior art, various techniques for detection and compensation of

Wear defects known. For example, reference is merely made to DE 44 31 845 A1.

Cutting inserts, such. As change or indexable inserts, are used, inter alia, during boring, fine or reworking bore inner contours. Fig. 10 shows, for example, a so-called iso-full-face plate 1, which has a symmetrical shape, with a rake face 2 and a support surface 4, which are plane-parallel to each other, wherein the support surface 4 is smaller than the rake face 2 and the side edges 6 employed are. Between the side edges 6 and the

Span surface 2 cutting edges 8 are formed.

FIG. 12 shows a section of a cross section of a cylinder head 10 in which a valve seat ring 12 is fitted, which has three angles, namely one

Valve seat angle of 45 °, the same cone angle as the valve plate, not shown and two correction angles of 15 ° and 75 °, respectively. If, as shown in Fig. 1 1, with the cutting plate described above, the same processing operation is repeatedly carried out on the valve seat 14, the indexable insert 1 is always loaded in the same place, resulting in a local wear on the cutting edge 8 and a gradual Reduction of the bore diameter at the valve seat 14 leads. Since the valve seat machining tool to which the indexable insert 1 is attached is usually provided with a reamer which is in the valve guide during the machining process, the tool as a whole can not be adjusted radially in order to compensate for the wear on the cutting edge 14. Thus, only the

Cutting plate 1 are corrected relative to the blade carrier, but this requires more complex clamping systems. Furthermore, such clamping and adjustment systems have the

Disadvantage that although they can be set exactly to the desired nominal diameter, which not only makes the assembly of the cutting plate more expensive, but also makes it error-prone.

Against this background, the object of the present invention is to provide a cutting insert and a corresponding cutting tool that provide a longer service life without wear-related cutting edge corrections.

This object is with respect to the cutting insert by the features of claim 1 and with respect to the cutting tool by the features of

Claim 9 solved. The subject matter of claim 11 is a general one

rotationally driven tool with at least one cutting edge, which also solves the problem underlying the invention.

Advantageous developments are the subject of the dependent claims.

The cutting insert has a support surface and a plane-parallel opposing rake face on which at least one cutting edge is formed on. The bearing surface and the clamping surface each have the same basic geometric shape, ie they have a triangular shape, a rectangular shape or another polygonal shape, wherein the aspect ratios may be different. In a plan view of the rake face, ie in the cutting direction of the cutting insert when viewed, the at least one cutting edge is set outwardly at a predetermined angle relative to the corresponding edge of the support surface, while all other outer edges of the rake surface extend parallel to the corresponding edges of the bottom surface. In other words, the at least one cutting edge in the plane or at least in the projection plane of the rake face is one

Cutting edge turned outwards. As a result, the rake face in the region of the cutting edge is enlarged by a wedge-shaped section, so that the

Cutting geometry is corrected by a predetermined allowance. This allowance is intended to compensate for part of the expected wear on the cutting edge.

Thus, the corrected cutting edge of the invention

Cutting insert compared to a conventional cutting insert on a certain wear buffer and thus achieves the maximum allowable wear limit after a longer period of use. Thus, can be achieved by the cutting insert according to the invention with a set by a predetermined angle to the outside cutting edge without additional measures a longer service life.

To ensure that the machined with the cutting insert according to the invention workpiece achieves a dimensionally stable workpiece surface, taking into account the allowable manufacturing tolerance of the cutting insert, the predetermined angle should be within the angular or positional tolerance of the workpiece to be machined. That is, the cutting geometry, in particular the

Cutting edge angle, can only be corrected so far and provided with an allowance, as permitted by the tolerance field of the workpiece to be machined. Even if the tolerance field of the workpiece to be machined leaves the free space for any

Cutting geometry corrections narrowly limited, it has been shown that already

Changes in the small area can lead to significant increases in service life.

The claim 3 is directed to the general principle that the present invention is based. In the case of the cutting insert according to the invention, the at least one cutting edge, in view of a wear to be expected in the case of repeated repetition of the same machining operation, has to be one

predetermined allowance corrected cutting geometry, taking into account the permissible manufacturing tolerance of the cutting insert is within the tolerance range of the workpiece to be machined. This pre-determined allowance can be achieved as in the cutting insert according to claim 1 by a corresponding increase in the rake face or correction of the cutting edge angle or otherwise, as long as the wear-related allowance does not cause the machined workpiece no longer meets the required tolerances.

It may be particularly advantageous, especially if the front or in

Feed direction leading edge of the cutting edge of the cutting insert is provided with a certain allowance, since the axial delivery of the

Cutting tool the front or leading section of the cutting edge first comes into contact with the workpiece to be machined and thus always more heavily loaded and exposed to higher wear than a trailing or trailing portion of the cutting edge.

In the case of an outer contour machining, the correction allowance should be at most the lower limit of the workpiece to be machined. In the case of one

Internal contour machining on the other hand, the allowance should be at most the upper limit of the workpiece to be machined. That is, around the cutting edge of the

The cutting insert can be provided with a wear buffer

Cutting geometry within the corridor between nominal size and lower

Limit or upper limit of the workpiece to be machined to be corrected. Instead of adjusting the cutting edge to the nominal size of the workpiece to be machined and to fall after a longer period of use above the allowable upper limit or below the allowable lower limit of the workpiece to be machined, the cutting insert according to the invention tries as close as possible to the

to get the opposite limit measure, so as to the possible

Wear area to the entire tolerance field of the workpiece to be machined to expand.

The cutting geometry can also be corrected by a predetermined angle depending on the location of the expected wear. For example, the cutting edge not only in the chip surface plane, but also perpendicular to it be corrected as long as the blade undergoes an oversize in a direction opposite to the wear direction.

The predetermined angle may be in the range of 0.5 ° to 1, 5 °, preferably in the range of 0.9 ° to 1, 1 °, in particular about 1 °. The permissible tolerance fields generally depend on the nominal diameter, so that the

Angular ranges depending on the size dimension of the machined

Workpiece can be increased accordingly or must be reduced. In practice, however, it has been shown that a 1 ° corrected cutting edge in most cases does not exceed the allowable tolerance of the workpiece to be machined. Depending on the cutting material, a more or less large correction can be made.

Cutting inserts have certain contact points and / or surfaces, which are relevant for the alignment of the cutting edge. If a conventional

Cutting insert in a corresponding insert seat, clamping claw or cassette is arranged as intended, corresponds to the cutting edge angle the intended nominal angle or cone angle. The cutting edge of the

cutting insert according to the invention can by the predetermined angle of

Nominal angle deviate. That is, at a nominal angle of 45 °, the cutting edge is inclined by the predetermined angle, e.g. B. 1 °, deviates and thus is only 44 °.

Since in the insert according to the invention only one cutting edge can be corrected and the remaining dimensions, in particular the contact points and / or surfaces remain unchanged, the cutting insert according to the invention can be used with conventional fixing devices without special assembly steps,

Devices or other measures are required.

If only the cutting edge on the cutting insert is corrected as described above, this may result in the cutting wedge not being constant along the cutting edge. In order to achieve a consistent cutting wedge along the cutting edge, in the cutting insert according to the invention by a bevel a appropriate cutting correction are made. As a result, a longer service life can be achieved with the same cutting behavior.

The cutting insert according to the invention can be used in conjunction with a

This cutting tool has a carrier body, a detachable on the carrier body

arranged cutting insert, such as. As the cutting insert according to claim 1, and a clamping claw or clamping screw or other means for positionally accurate fixing of the cutting insert relative to the carrier body. In which

Cutting tool according to the invention, the cutting edge of the intended purpose fixed to the carrier body cutting insert deviates from the nominal size of the workpiece to be machined by the predetermined angle.

More specifically, an angle included between the cutting edge and the rotation axis of the cutting tool corresponding to the nominal angle can be reduced by the predetermined angle when the expected wear occurs at a radially inner portion of the cutting edge and increased by the predetermined angle when expected wear occurs at a radially outer portion of the cutting edge. When the wear occurs at the radially inner portion of the cutting edge and in the axial direction at the front portion of the cutting edge, and thus the radially inner portion or front portion of the cutting edge is corrected by a predetermined allowance, the cutting edge angle with respect to the rotation axis decreases. If, on the other hand, the expected wear occurs at the radially outer region or in the rear axial feed direction, this area can be provided with an oversize, so that the cutting edge angle increases with respect to the rotational axis of the cutting tool.

Thus, based on empirical values, a correspondingly corrected

Cutting insert can be chosen so as to the specific wear of the

Prevent editing process.

Claim 1 1 is directed to a general rotary-driven tool, which also meets the above-mentioned object. This tool has at least one cutting edge for machining or producing a defined workpiece surface, the cutting edge being corrected by a predetermined allowance in dependence on an expected wear

Having cutting geometry, wherein the predetermined allowance taking into account the allowable manufacturing tolerance of the cutting edge is within the tolerance of the workpiece to be machined. The inventive principle is thus not limited to cutting tools with interchangeable cutting inserts, but can be applied to any rotary-driven tool, if this one

Form cutting edge for producing a very specifically defined workpiece surface has. For example, a twist drill can also have a cutting geometry corrected by a predetermined allowance in order to be able to withstand the occurring wear over a longer period of time.

The above aspects solve both individually and in any

Combination of the object underlying the invention and should therefore be claimable individually or in any combination within the scope of this application.

Brief description of the drawings

The present invention will be described below with reference to preferred

Embodiments with reference to the accompanying drawings described in more detail. Show it:

Fig. 1 is a plan view of a cutting insert according to a first

Embodiment of the invention;

Fig. 2 is a bottom view of the cutting insert according to the first

Embodiment of the invention;

Fig. 3 is a plan view of a cutting insert according to a second

Embodiment of the invention; Fig. 4 is a bottom view of the cutting insert according to the second embodiment of the invention;

Fig. 5 is a clamping claw with a cutting insert according to the first

Embodiment of the invention;

Fig. 6 is a partial view of a valve seat;

Fig. 7 shows schematically the cutting edge correction principle, starting from a cutting insert according to the prior art;

Fig. 8 is a perspective view of the cutting insert according to the second embodiment of the invention;

9 is a perspective view of a cutting insert according to a modified second embodiment of the invention;

Fig. 10 is a plan view of a cutting insert of the prior art;

Fig. 1 1 is a side view of the cutting insert of Fig. 10;

Fig. 12 is a partial cross-sectional view of a valve seat;

FIG. 13 is an enlarged detail view of FIG. 12; FIG.

14 shows the cutting insert of the prior art with wear marks on the cutting edge;

Fig. 15 is a perspective view of the cutting insert according to a third embodiment of the invention;

FIG. 16 shows the side view of the embodiment according to FIG. 15; FIG. 17A to 17C are sectional views of the cutting insert according to Figures 15 and 16 at different points of the cutting edge. and

Fig. 18 is a plan view of a fourth embodiment of the cutting insert ..

Detailed description of preferred embodiments

The Fign. 1 and 2 show a plan view and a bottom view, respectively

Cutting insert 20 according to a first embodiment with a rake face 22 and a support surface 24 which are plane-parallel to each other. Both the rake surface 22 and the support surface 24 are triangular and thus have the same

geometric basic form. The support surface or bottom surface 24 is slightly smaller, so that the side flanks 26 located between the rake surface 22 and the support surface 24 are set to the support surface 24. While the support surface 24 has the shape of an equilateral triangle with three equal angles of 60 °, the shape of the rake surface 22 deviates slightly from it. One of the three edges between the side edges 26 and the rake face 22 is formed as a cutting edge 28. As shown in Figs. 1 and 2, it is the only one which is not parallel to the corresponding edge 30 of the support surface 24, but is set at an angle α outwards, so that the rake face 22 is a wedge-shaped section, which is dashed in FIG

is located, enlarged. If the angle δ is 1 °, then the drawn in Fig. 1 angle α is 61 °, the angle ß 60 ° and the angle γ 59 °.

The Fign. 3 and 4 show a cutting insert 40 according to a second

Embodiment, with a rake face 42 and a plane parallel to the support surface 44. Between the rake face 42 and the support surface 44 are salaried side edges 46. The rake face 42 and the support surface 44 again have the same basic geometric shape, the support surface 44 is square and the Span surface 42 as in the first embodiment to a wedge-shaped

Surface portion 52 is expanded, as indicated in Fig. 3 by the hatched area. One of the edges between the rake face 42 and side flanks 46 is again formed as a cutting edge 48, which is set out to a corresponding edge 50 on the bottom or support surface 44 by an angle δ outwards, while the other edges of the rake face 42 and the support surface 44 parallel to each other. Due to the changed cutting edge angle a, which is for example increased by 1 °, the corresponding other angle γ is again reduced by the angle δ or 1 °, while the other two angles β each form a right angle.

FIG. 5 shows clamping claw 60, with which the triangular cutting insert or cutting insert 20 of the first embodiment is connected to a not shown

Cutting plate carrier of a finishing tool can be clamped. The cone angle ε, which forms the uncorrected cutting edge (drawn in dashed lines) with the axis of rotation, is determined by the specific configuration of the respective clamping claw 60. Since the cutting plate 20 according to the invention one by one

Correction angle δ has corrected cutting edges, the actual deviates

Cone angle (ε - δ) of the predetermined by the clamping claw 60 cone angle λ. Since, as is clear from the foregoing description, only the

Cutting edge region is corrected and the remaining part of the cutting plate 20 corresponds to the geometry of a conventional insert 1, the cutting plate 20 according to the invention without any modifications with conventional

1 inserts designed clamping claws 60 are used.

FIG. 6 shows a valve seat 14 which has already been described in connection with FIGS. 12 and 13, with a marked tolerance field having an upper dimension Es and a lower dimension El between a nominal dimension N and a maximum dimension G _O B or minimum dimension G _uB . The maximum dimension G ₀ B and minimum dimension G _uB form a kind of correction _corridor within which the cutting edge 28 (see FIG. 7) can be corrected without falling out of the tolerance of the valve seat 14 to be manufactured. Since, as can be seen from FIG. 14, the cutting edge 8 wears, ie migrates in the direction of minimum dimension G _uB in FIG. 6, the cutting edge 28 should be corrected in such a way that it makes use of the permissible upper dimension ES before the first use and thus comes close to the maximum G ₀ B. Over time, the cutting edge 28 moves due to the wear of the maximum G ₀ B in the direction of minimum G _U B- But the so corrected cutting insert 20 are used much longer than when it is made to the nominal size of the workpiece to be machined.

FIG. 8 shows a perspective view of the cutting insert 40 according to the second embodiment, in which the cutting edge 48 in the plane of the rake face 42 is tilted outwards. However, as shown in Fig. 9, the cutting edge 48 'can be corrected otherwise by changing the cutting edge 28' outwardly and upwardly toward the original rake face, i.e., the cutting edge 48 '. the rake surface 42 'is tilted slightly upwards, so that the shape shown in FIG. 9 is formed. Alternatively, instead of the entire rake face 42 ', only an outer edge section in the region of the cutting edge 28' can be correspondingly changed.

FIGS. 15 to 18 show further embodiments of a cutting insert in which the correction of the cutting edge profile in the sense of the invention described above is achieved by a special manufacturing method. This method and the design of the cutting insert or of the cutting tool equipped therewith are the subject of an independent invention for which separate protection is claimed.

The cutting insert designated by 140 in FIGS. 15 and 16 is formed by a square body with a bottom surface 142 and a clamping surface 132 that is essentially plane-parallel thereto. The cutting edges 148A-148D are formed between the rake surface 132 and the clearance surfaces 146, where the clearance angle is designated WF. The cutting edges enclose the corner angle WE with each other.

In Figure 15 is indicated by dashed lines, as the course of

Cutting edge 148 at selected locations - here on two sides in the region of the cutting edges 148C and 148D - can be corrected in the sense of the invention described above. This is done by sanding an edge chamfer 150, the width B of which preferably changes continuously along the cutting edge 148C or 148D, as shown in Figures 17A to 17C, in which are sectional views of the cutting insert at selected locations I, II, and III along the cutting edge 148C. The chamfer angle WFA remains over the entire length of the cutting edge preferably constant. Due to the relief-ground surface 146, a new course of the cutting edge 148C ^* and 148D ^* results due to the inner widening edge bevel 150, such that the corrected cutting edge is not only inclined to the

Floor surface to, but - due to the clearance angle WF - is also offset inwards, so that the corner angle WE changes to WEKORR. The positional offset inwardly is indicated in FIGS. 17A to 17C by the dimension LVI1 to LVI3.

With proper installation of the cutting insert, this positional correction of the cutting edge 148C ^* and 148D ^{* can be used} to extend the life of the cutting insert by minimizing the width of the edge bevel where increased edge wear is to be expected.

A plan view of another embodiment of the cutting insert with corresponding cutting edge angle correction (although the angle correction is shown greatly exaggerated) is shown in FIG. Here, the polygonal prismatic cutting insert 240 has triangular shape starting from a dashed geometric figure of an equilateral triangle. With dash-dotted line the bottom surface 242 is indicated. After sanding the floor surface, the

Span surface and the side surfaces with the clearance angle (corresponding to Figure 15 and 16) are the cutting edges 248 on the dashed lines, which are parallel to the Begrenzug the bottom surface.

In order to specifically correct the course of the cutting edges 248 -in the cutting direction, ie in the direction perpendicular to the drawing plane of FIG. 18 -the cutting edges 248 are chamfered again, ie an edge chamfer 250 is attached in such a way that its width BF extends along the cutting edge changes. This results in three new cutting edges 248 A ^* , 248B ^* and 248C ^* , which - as shown in Figure 16 not only down to the bottom surface 242 but - due to the positive clearance angle - even compared to the output cutting edge 248 by an angle δ to to run inside. This angle δ corresponds to the angle δ, which was explained with reference to the figures 1 to 7. This provided when looking at the cutting plate in the cutting direction

Angular deviation is used according to the invention to position the cutting edge 248A ^* so that the position correction of the cutting edge 248A ^* to 248C ^* to the

Extend the life of the cutting insert can contribute. The width of the edge bevel 250 is therefore kept lower where increased edge wear is to be expected.

A particularly simple production of the cutting insert 240 with the characteristics described above results when the edge bevel 250 is produced as follows. It should be emphasized that this procedure as well as the

Field of application of the cutting plate processing is the subject of an independent invention, is claimed for the separate protection.

After the bottom surface 242, the rake face 244 and the circumference of the

Cutting tip 240 was ground with the appropriate clearance angle, the tool, preferably the grinding wheel with which the Kantenfase 250 is to be generated aligned so that the Kantenfase constant chamfer angle WFA (see Figure 17A to 17C) by a linear movement parallel to the bottom surface 242 and can be generated to the original cutting edge 248.

Then, the insert 240 is rotated by a predetermined angle WD indicated in FIG. 18, whereupon the edge bevel 250 is ground. The greater the angle of rotation WD is chosen, the greater the width BF of the

Edge chamfer over the cutting edge length and the stronger is the angle correction by the value of the angle δ. The size of the predetermined angle of rotation WD required for correcting the cutting edge profile by the required angle δ depends on the chamfer angle WFA and on the clearance angle WF.

This design of the cutting insert can also be used to achieve a slight change in angle on the valve seat ring to be machined, without having to rework the insert seat in the tool for this purpose. In this case, the cutting insert is removed from the seat and, as described above, equipped with an edging bevel as shown in FIG. 18, after being calculated by a previously calculated one Angle WD has been twisted. In this way can be reproducible by post-processing of the cutting plate (eg at a chamfer angle of 20 °, a clearance angle of about 10 ° and a width B of the Kantenfase in the range of o, 2 mm)

Angular corrections for the position of the valve seat annular surface in the range of only a few 1/100 second, e.g. 0.04 °, achieve.

Of course, deviations from the embodiments shown are possible without departing from the spirit of the invention. The edge chamfer 150 or 250 may of course also be produced in another way, e.g. by moving the milling or grinding tool in the direction of the original cutting edge 148, 248 and, at the same time, by means of an advancing movement on the bottom surface 242, dipping deeper and deeper into the cutting insert.

The Kantenfase is not necessarily formed by a flat surface.

In the foregoing, a cutting insert and a cutting tool have been described which have a longer service life without wear-related cutter corrections

to have to make. The cutting insert according to the invention has been described with reference to various embodiments. Of course, the invention is not limited to these embodiments, but may be within the

Scope of the claims to be changed. Of course, individual or multiple elements of the various embodiments can be combined with each other arbitrarily.

The cutting insert can also have all other conventional polygonal shapes such as rhomboid and the free surface on the side edge of the cutting edge all commonly used clearance angle such as 3 °, 5 °, 7 °, etc. have. Of the

Cutting insert may be provided with or without chip breaker grooves and made of all commonly used cutting materials, e.g. PCD, CBN, VHM, coated (soft and / or hard layer) or uncoated.

Claims

claims

1 . Cutting insert (20; 40; 140; 240) for a cutting tool for machining workpieces, having a bearing surface (24; 44; 142; 242) and an opposite chip surface (22; 42; 132) with the same basic geometric shape, on which at least one cutting edge (28; 48; 148; 248) is formed,

characterized in that

in a plan view of the rake surface (22; 42; 132; 232) the at least one cutting edge (28; 48; 148C ^* ; 248A ^* to 248C ^* ) relative to the corresponding edge (32; 50) of the support surface (24; 44) is set at a predetermined angle to the outside, while all other outer edges of the rake face (22; 42) extend parallel to the corresponding edges of the support surface (24; 44).

2. Cutting insert (20; 40) according to claim 1, characterized in that the cutting edge (28; 48; 148 ^* ; 248 ^* ) in a plan view of the rake face (22; 42) by a positive angle (δ) made to the outside is, taking into account the allowable manufacturing tolerance of the cutting insert (28; 48) within the angular tolerance of the workpiece to be machined.

A cutting insert (20; 40) for a cutting tool for machining workpieces, comprising at least one cutting edge (28; 48),

characterized in that

the at least one cutting edge (28; 48; 148 ^* ; 248 ^* ) in consideration of a multiple repetition of the same machining operation

Wear has a corrected by a predetermined allowance (δ) cutting geometry, taking into account the allowable manufacturing tolerance of

Cutting insert (28; 48; 140; 240) within the tolerance field of

working workpiece lies.

4. cutting insert (20; 40) according to claim 3,

characterized in that the allowance (δ) in the case of outer contour machining is at most the lower limit (El) and, in the case of inner contour machining, at most the upper limit (ES) of the workpiece to be machined.

5. Cutting insert (20; 40) according to claim 3 or 4, characterized in that

the cutting geometry depending on the location of the expected

Wear is improved by increasing a cutting angle (a) by a predetermined angle (δ).

6. Cutting insert (20; 40) according to one of claims 1 to 5, characterized

marked that

the predetermined angle (δ) in the range of 0.5 ° to 1, 5 °, preferably in

Range of 0.9 ° to 1, 1 °, in particular has 1 °.

7. Cutting insert (20; 40) according to one of claims 1 to 6, characterized

marked that

the cutting edge (28; 48), when the cutting insert (20; 40) is aligned with the bearing points and / or surfaces corresponding to its positional alignment of the cutting insert (20;

predetermined angle (δ) deviates from the nominal angle (ε).

8. Cutting insert (20; 40) according to one of claims 1 to 7, characterized

marked that

a cutting correction is made by a bevel, so that the cutting wedge along the cutting edge (28, 48) is substantially equal.

9. Cutting tool for machining workpieces, with a carrier body, a releasably arranged on the carrier body cutting insert (20; 40) according to one of the preceding claims and a clamping claw (60) or

Clamping screw for positionally accurate fixing of the cutting insert (20, 40) relative to the carrier body, characterized in that the cutting edge (28; 48) of the cutting insert (20; 40) fixed in the intended manner on the carrier body deviates from the nominal dimension of the workpiece to be machined by the predetermined angle (δ).

10. Cutting tool according to claim 9, characterized in that

a between the cutting edge (28, 48) and the axis of rotation of the

Cutting tool enclosed acute angle (ε) to the predetermined angle (δ) is reduced when the expected wear on a radially inner portion of the cutting edge (28; 48) occurs, and increased by the predetermined angle (δ) when the Expected wear on a radially outer portion of the cutting edge (28, 48) occurs.

1 1. Rotationally driven tool having at least one cutting edge (28, 48) for machining or producing a defined workpiece surface, characterized in that

the cutting edge (28; 48) has a cutting geometry corrected by a predetermined allowance (δ) as a function of expected wear, wherein the predetermined allowance (δ), taking into account the permissible manufacturing tolerance of the cutting edge, lies within the tolerance field of the workpiece to be machined.