EP4251354A1

EP4251354A1 - Cutting insert for recess machining, cutting insert kit having two such cutting inserts, cutting insert holder for such cutting inserts, and method for producing a recess

Info

Publication number: EP4251354A1
Application number: EP21820519.3A
Authority: EP
Inventors: Wolfgang Baumann; Tobias GRÄUPEL
Original assignee: Mapal Fabrik fuer Praezisionswerkzeuge Dr Kress KG
Current assignee: Mapal Fabrik fuer Praezisionswerkzeuge Dr Kress KG
Priority date: 2020-11-26
Filing date: 2021-11-25
Publication date: 2023-10-04
Also published as: JP2024502539A; WO2022112447A1; US20240017329A1; CN116635178A; KR20230106635A; DE102020214901A1; MX2023006201A; CA3196366A1

Abstract

The invention relates to a cutting insert holder (29) having a central axis (M) and at least one first receptacle (31) for fastening a first cutting insert (1.1) to the cutting insert holder (29), and having at least one second receptacle (33) for fastening at least one second cutting insert (1.2) to the cutting insert holder (29), wherein the first receptacle (31) and the second receptacle (33) are arranged offset from one another in the circumferential direction about the central axis (M), wherein the first receptacle (31) and the second receptacle (33) are designed and arranged such that a first rake face (21.1), assigned to an active main lip (9.1), of a first cutting insert (1.1) arranged in the first receptacle (31) has a first orientation in the circumferential direction, wherein a second rake face (21.2), assigned to an active main lip (9.2), of a second cutting insert (1.2) arranged in the second receptacle (33) has a second orientation in the circumferential direction, wherein the first orientation is opposite to the second orientation when the first cutting insert (1.1) and the second cutting insert (1.2) are fastened to the cutting insert holder (29).

Description

DESCRIPTION

Insert for grooving, insert kit with two such inserts, insert holder for such inserts, and method for producing a groove

The invention relates to a cutting insert for recess machining, a cutting insert kit with two such cutting inserts, a cutting insert holder, in particular for such cutting inserts, and a method for producing a recess, in particular a groove. The problem of burr formation on the edges of the groove often arises when machining the groove, in particular when producing grooves. This problem is aggravated when machining hard, tempered or hardened materials. The plunge machining of toothed shafts, for example to produce circlip grooves, is particularly problematic, since the resulting burrs can mean that the toothed shaft can no longer be joined to a gear wheel or countershaft in a torque-transmitting manner. The discontinuous cutting conditions resulting from the gearing are particularly problematic. In particular, conventional chisels with a radial design have insufficient stability under such cutting conditions and therefore tend to chatter, which exacerbates the problem presented here. Any burrs that have arisen have to be removed in a complex manner, for example by grinding, which entails considerable post-processing work. Overall problems therefore arise, in particular with regard to a high level of rejects and/or a high production outlay and high production costs in connection with the incision machining, in particular with the production of such grooves. The object of the invention is therefore to create a cutting insert for incision machining, a cutting insert kit with two such cutting inserts, a cutting insert holder, in particular for such cutting inserts, and a method for producing a recess, in particular a groove, in which the disadvantages mentioned do not occur . The object is achieved by providing the present technical teaching, in particular the teaching of the independent claims and the embodiments disclosed in the dependent claims and the description.

The object is achieved in particular by creating a cutting insert for incision machining. The cutting plate has a base body and a puncture projection that protrudes radially from the base body, with the puncture projection having a main cutting edge on a working end remote from the base body. The puncture projection has a deburring blade on at least one side at a transition end facing the base body in the transition region to the base body. Advantageously, when machining a workpiece with the cutting plate, the main cutting edge comes into contact with the workpiece first, with the deburring blade arranged at the base of the piercing projection also being used in the course of the production of a recess, in particular a groove, in particular when a desired recess or groove depth is reached comes into contact with the workpiece. The edge of the groove is deburred in one and the same operation as it is made in the workpiece. In this way, the problem of burr formation is solved simply, precisely and cost-effectively, and the production effort associated with the incision processing is significantly reduced, which not least also lowers the production costs.

The cutting insert is set up in particular for carrying out a method according to the invention for producing a recess, in particular a groove, or for carrying out a method according to one or more of the embodiments described below. The cutting plate is formed in particular by the deburring blade arranged at the transition end in the transition region to the base body on the puncture projection in order to carry out such a method.

The main cutting edge is preferably formed in one piece, in particular from the same material, with the piercing projection. Alternatively, however, it is also possible in a preferred embodiment for the main cutting edge to be formed from a different material than the puncture projection and to be attached to the puncture projection, in particular to be connected to the puncture projection, in particular to be joined.

The deburring blade is preferably formed in one piece, in particular from the same material, with the puncture projection. Alternatively, however, it is also possible in a preferred embodiment for the deburring blade to be formed from a different material than the piercing projection and attached to the puncture projection, in particular connected to the puncture projection, in particular joined.

The puncture projection is preferably formed in one piece, in particular of the same material, with the base body.

The puncture projection and the main cutting edge, preferably with the deburring cutting edge, are preferably formed in one piece, in particular of the same material, with the base body.

In a preferred embodiment, the cutting plate has a fastening hole on the base body for fastening the cutting plate to a cutting plate holder, in particular a cutting plate holder according to the invention or a cutting plate holder according to one or more of the exemplary embodiments described below. The fastening bore preferably passes through the base body and is set up so that a fastening means, in particular a fastening screw, can itself reach through it. The cutting insert holder, in particular the cutting insert holder according to the invention or preferred according to the invention described below, preferably has, at least according to one exemplary embodiment, a counter-fastening means, preferably a thread, into which the fastening means, in particular the fastening screw, can engage in order to fasten the cutting insert to the cutting insert holder.

According to a development of the invention, it is provided that the puncture projection has a deburring blade on both sides at its transition end. The term "both sides" refers in particular to an extension of the main cutting edge and thus in particular to a width direction of the recess formed with the cutting plate, in particular a groove width of the groove formed. A deburring blade is therefore assigned to each end of the main cutting edge in particular on the puncture projection. In this way, it is possible to deburr both puncture edges of the resulting puncture, in particular both groove edges, at the same time, one of the deburring cutters being assigned to each puncture edge. The production effort is thus advantageously particularly low, and the cutting plate can be used particularly efficiently.

According to a development of the invention, it is provided that the plunging projection and the main cutting edge are designed and arranged relative to the base body in such a way that cutting forces are introduced tangentially into the base body during the plunging machining of a workpiece. The cutting forces introduced into the main cutting edge are thus Insert supported tangentially, whereby the entire cross-section of the insert is available to support the cutting forces. This results in a very high stability of the cutting insert during the indentation machining, which in turn results in a high quality of the indentation that is produced with at the same time low burr formation. In particular, there is a significantly reduced rattling tendency for the cutting insert compared to a radial Ab support.

A tangential support means in particular that the main cutting edge extends perpendicularly to a main plane of the base body, the main plane being in particular a plane of greatest extent of the base body, in particular a plane on which the fastening bore is perpendicular. Thus, the main cutting edge preferably extends parallel to the fastening bore. The cutting forces are thus introduced in particular tangentially to an imaginary circumferential line around an axial direction defined by the fastening bore. In particular, the main cutting edge preferably extends in the axial direction.

According to a development of the invention, it is provided that the cutting plate has at least one material that is selected from a group consisting of hard metal and cubic crystalline boron nitride, in particular PcBN. In this way, the cutting plate is particularly advantageously set up to also machine hard, in particular tempered or hardened, materials. The cutting plate preferably consists of a material selected from the group consisting of hard metal and cubic crystalline boron nitride, in particular PcBN. According to a preferred embodiment, it is possible for the cutting tip to be formed essentially from hard metal and to have a ply or layer of cubic crystalline boron nitride. Alternatively, however, it is preferably also possible for the cutting insert to consist entirely of hard metal. According to another preferred embodiment, it is possible for the cutting insert to consist entirely of cubic crystalline boron nitride.

Alternatively or additionally, the cutting insert is preferably coated at least in the area of the main cutting edge, preferably at least in the area of the piercing projection. In particular, the coating can advantageously contribute to the fact that the cutting insert is suitable for machining hard, in particular tempered or hardened, materials. A coating material with which the cutting plate is preferably coated is preferably selected from a group consisting of TiAlN, TiAlSiN, TiSiN, TiCN, TiN, AlCrN, and Al2O3. Alternatively or additionally, the cutting plate is preferably coated at least in the area of the deburring blade.

According to a preferred embodiment, the cutting insert is coated only in the area of the main cutting edge, or only in the area of the deburring cutting edge, or on the one hand in the area of the main cutting edge and on the other hand in the area of the deburring cutting edge, or only in the area of the piercing projection. Alternatively, in a preferred embodiment, it is also possible for the cutting insert to be coated overall.

According to a development of the invention, it is provided that at least one cutting edge stabilization geometry is assigned to the main cutting edge. The stability and thus the machining quality, but also the service life of the cutting insert, can be advantageously increased by means of the cutting edge stabilization geometry. In particular, the main cutting edge is protected by the cutting edge stabilization geometry, which is particularly advantageous when machining hard, in particular tempered or hardened materials. In particular, the cutting edge stabilization geometry means that the cutting insert does not have to be changed as often, which means that production costs are low.

The cutting plate preferably has the blade stabilization geometry. Alternatively or additionally, the cutting edge stabilization geometry is preferably arranged in a transition area from the main cutting edge to a flank. In particular, the transition from the main cutting edge to the flank is less abrupt due to the cutting edge stabilization geometry, so that the main cutting edge is designed to be less sensitive.

The at least one blade stabilization geometry is preferably selected from a group consisting of a fillet and a chamfer. These geometries have proven to be particularly suitable for stabilizing the main cutting edge. It is possible that the cutting edge stabilization geometry only has a fillet or only a chamfer. However, it is also possible for the cutting edge stabilization geometry to have a combination of a rounding and a chamfer—in particular arranged one behind the other starting from the main cutting edge. The blade stabilization geometry may also include a plurality of fillets, chamfers, or fillets and chamfers.

According to a further development of the invention it is provided that the cutting plate is designed as an indexable cutting plate, the cutting plate having at least two in one Circumferentially of the base body offset to one another arranged - has puncture projections - in particular diametrically opposite each other. This requires a particularly economical design of the cutting plate, since it can first be rotated when a first piercing projection of the piercing projections is worn, so that a second piercing projection of the piercing projections is used for further workpiece machining, with the cutting plate only having to be replaced when all piercing projections are worn out. In particular, the cutting plate does not have to be replaced when a first and, if applicable, a single puncture projection is worn out.

The object is also achieved by creating a cutting insert kit that has a first cutting insert according to the invention or a first cutting insert according to one or more of the exemplary embodiments described above. The cutting insert kit also has a second cutting insert according to the invention or a second cutting insert according to one or more of the exemplary embodiments described above. The puncture projection of the first cutting tip has a first working width. The puncture projection of the second cutting plate has a second working width. The second working width is larger than the first working width. In connection with the cutting plate kit, there are in particular the advantages that have already been explained in connection with the cutting plate.

The cutting plate kit is set up in particular for carrying out a method according to the invention for producing a recess, in particular a groove, or for carrying out a method according to one or more of the embodiments described below. The cutting plate kit is designed in particular by the first cutting plate and the second cutting plate, each of which has a deburring blade arranged at the respective transition end in the transition region to the base body on the puncture projection, in order to carry out such a method.

A cutting insert kit is understood in particular as a combination of cutting inserts, in particular a set of at least two cutting inserts.

A working width of a puncture projection is understood to mean, in particular, an extension of the main cutting edge associated with the puncture projection in the width direction of the puncture to be formed or formed with the puncture projection, in particular in the direction of an emerging groove width. Since the second working width is greater than the first working width, the first cutting insert is set up for rough machining or pre-machining a workpiece, in particular a recess, in particular a groove, with the second cutting insert for finishing or finishing the workpiece, in particular the recess, in particular the groove , is set up. Roughing or pre-machining is also referred to as roughing for short, while finishing or finishing is also referred to as finishing. The difference between the first and second working width is also referred to as an oversize and defines a quantity of material to be removed during the finish machining relative to the pre-machining. The second puncture projection therefore has an oversize relative to the first puncture projection.

With the Schnei dpi atten kit, it is possible to carry out and finish a complete plunge machining of a workpiece in a simpler, faster and more cost-effective manner, in particular since pre-machining and final machining are carried out directly one after the other in an analogous manner with one another - in particular identical except for the different working widths - Cutting plates can be carried out. This is particularly efficient if the first cutting insert and the second cutting insert of the cutting insert kit are arranged on the same cutting insert holder, in particular on the cutting insert holder according to the invention or a cutting insert holder according to one or more of the exemplary embodiments described below.

The object is also achieved in that a cutting insert holder is created which has a center axis and at least one first receptacle for fastening a first cutting insert to the cutting insert holder. The cutting insert holder has at least one second receptacle for fastening at least one second cutting insert to the cutting insert holder, the first receptacle and the second receptacle being offset from one another in the circumferential direction about the central axis. The first receptacle and the second receptacle are designed and arranged in such a way that a first rake face, assigned to an active main cutting edge, of a first cutting insert arranged in the first receptacle has a first orientation along the circumferential direction, with a second rake face assigned to an active main cutting edge having an orientation in the second recording arranged second cutting plate along the circumferential direction has a second orientation. The first orientation is opposite to the second orientation when the first insert and the second insert are attached to the insert holder, particularly when the active Main cutting edges are each arranged in an engagement position for machining a workpiece. In connection with the cutting plate holder, there are in particular the advantages that have already been explained in connection with the cutting plate and the cutting dpi atten kit.

An active main cutting edge is understood to mean, in particular, a main cutting edge that is arranged and aligned on the cutting insert holder in such a way that a workpiece can be machined with the main cutting edge. In particular, when an insert is designed as an indexable insert, in addition to an active main cutting edge, it has at least one passive main cutting edge in the sense that the passive main cutting edge is not arranged in a machining position or engagement position, but rather in a rest or waiting position.

The first cutting insert is also referred to as the roughing insert and is intended for pre-machining or roughing. The second cutting plate is also referred to as a finishing plate and is intended for finishing or finishing.

The cutting insert holder is set up in particular for carrying out a method according to the invention for producing a recess, in particular a groove, or for carrying out a method according to one or more of the embodiments described below. The cutting insert holder is designed in particular for carrying out such a method, since the first cutting insert and the second cutting insert can be arranged on the cutting insert holder in the corresponding first and second orientation, so that a workpiece can be rotated within the scope of the method by reversing the direction of rotation of a relative rotation between the workpiece and the cutting insert holder first - with a first direction of rotation - with the first cutting insert and then - with a second direction of rotation opposite to the first direction of rotation - with the second cutting insert.

Particularly due to the arrangement of the two puncture projections of the cutting inserts in the opposite orientation with respect to the circumferential direction and thus at the same time a reverse direction of rotation of a relative rotation between the workpiece and the cutting insert holder for the various cutting inserts, a particularly efficient, fast and therefore also cost-effective plunge machining of a workpiece with deburring of a manufactured one is possible Puncture possible with the insert holder. An axial direction in relation to the cutting insert holder is in particular a direction which extends parallel to the central axis of the cutting insert holder or coincides with the central axis of the cutting insert holder. A radial direction is perpendicular to the axial direction, and a circumferential direction encompasses the axial direction concentrically.

The two receptacles for the cutting inserts are preferably arranged on the cutting insert holder in such a way that when the cutting inserts are mounted on the cutting insert holder, an axial direction of the cutting inserts is aligned parallel to the axial direction of the cutting insert holder. In particular, the fastening bores of the cutting inserts preferably extend in the axial direction of the cutting insert holder. In this way, the main cutting edge of each cutting insert then ultimately also extends along the axial direction of the cutting insert holder, and the circumferential direction is locally perpendicular to the chip faces of the cutting inserts.

The mounts for the first cutting insert and the second cutting insert are preferably arranged on the cutting insert holder in such a way that the puncture projections are aligned radially inward towards the central axis when the cutting inserts are arranged on the respective mounts. In particular, the receptacles are arranged on an outer circumference of the cutting insert holder. In this way it is possible, in particular, to arrange a workpiece in an inner machining area, in particular in the area of the central axis of the cutting tip holder, and to machine the workpiece first with the first cutting tip and then with the second cutting tip, in particular by first cutting the first cutting tip and then the second cutting insert is advanced in the radial direction towards the workpiece, which is understood in particular to mean a relative movement between the workpiece and the cutting inserts. This includes either relocating the workpiece and holding the tip holder stationary, or relocating the tip holder and holding the workpiece stationary, or relocating both the tip holder and the workpiece relative to one another.

A configuration of the cutting-bit holder is particularly preferred in which a first cutting bit, in particular a cutting bit according to the invention or a cutting bit according to one or more of the exemplary embodiments described above, is arranged on the first receptacle, with a second cutting bit, in particular a cutting bit according to the invention or a cutting bit according to one of the exemplary embodiments described above, is arranged on the second receptacle. An embodiment of the cutting insert holder in which a cutting dpi atten kit, in particular one, is particularly preferred cutting plate kit according to the invention or a cutting plate kit according to one or more of the exemplary embodiments described above, arranged on the cutting plate holder, in particular a first cutting plate of the cutting plate dpi atten kit on the first receptacle, and a second cutting plate of the cutting plate dpi atten- Kits on the second pickup.

The fact that a cutting plate is arranged on a receptacle includes that the cutting plate is arranged in the receptacle.

In a preferred embodiment, it is possible for the cutting insert holder to have more than one first receptacle for a plurality of first cutting inserts. Alternatively or additionally, the cutting insert holder preferably has more than one second receptacle for a plurality of second cutting inserts.

It is also possible for at least one additional receptacle for at least one additional cutting insert to be arranged on the cutting insert holder, with the at least one additional receptacle and the at least one additional cutting insert being provided for at least one intermediate machining step between pre-machining and final machining.

If the cutting insert holder has exactly one first receptacle and exactly one second receptacle, the two receptacles are preferably arranged diametrically opposite one another, in particular offset by 180° relative to one another in the circumferential direction on the cutting insert holder. If the cutting-bit holder has a plurality of first receptacles and/or a plurality of second receptacles, the angular distances between adjacent receptacles are preferably smaller, for example 90° in each case with a total of four receptacles.

According to a development of the invention, it is provided that the cutting insert holder is matched to a workpiece to be machined in such a way that a first cutting insert arranged on the at least one first receptacle and a second cutting insert arranged on the at least one second receptacle are separately and in particular sequentially applied to the Workpiece can be delivered. In this way, the workpiece can advantageously be machined quickly and easily, first with the first cutting plate and then with the second cutting plate. In particular, a radius of a peripheral line of the cutting insert holder, on which the receptacles are arranged, is preferably selected such that the workpiece can be arranged in the area of the central axis within the circumference of the cutting insert holder such that initially the first cutting insert engages with the workpiece can occur while the second cutting insert is not in engagement with the workpiece, after which a relative radial infeed of the cutting insert holder onto the workpiece can be carried out in such a way that the second cutting insert engages with the workpiece while the first cutting insert does not engage with the workpiece is engaged.

The cutting insert holder preferably has an interface for fastening the cutting insert holder to a machine tool. In particular, the interface can be configured in different ways. In particular, it is also possible for the interface on the cutting insert holder to be exchangeable. The insert holder can then be used in a preferred manner with various machine tools.

The interface can be designed, for example, as a VDI40 mount, as a steep cone interface, as a Morse cone interface, as an HSK interface, or in some other suitable way.

The insert holder is preferably set up to interact with a machine tool that is selected from a group consisting of a vertical lathe, a horizontal lathe, and a machining center.

Finally, the object is also achieved by creating a method for producing a recess, in particular a groove, in particular an annular groove, in particular a circlip groove, in a workpiece, in particular a toothed shaft, in particular a shaft with teeth, the method having the following steps comprises: The workpiece is pre-machined by using a first cutting insert, in particular using a first cutting insert according to the invention or a first cutting insert according to one or more of the exemplary embodiments described above, to pierce a pre-cut, in particular a ridge, into the workpiece, with the pre-cut having a first has width. In this case, the workpiece is rotated relative to the first cutting tip in a first direction of rotation. This machining step is also referred to as roughing. The workpiece is finish-machined using a second cutting insert, in particular using a second cutting insert according to the invention or a second cutting insert according to one or more of the exemplary embodiments described above, in that the pre-groove is widened to a second width, the second width being greater than the first width. In this way, the workpiece rotates relative to the second cutting tip in a second direction of rotation. This processing step is also referred to as finishing. This way will the puncture, in particular the groove, is made. The second direction of rotation is opposite to the first direction of rotation. The resulting recess is deburred during finish machining, in particular by means of the second cutting insert. In connection with the method, there are in particular those advantages which have already been explained in connection with the cutting plate, the cutting plate kit and the cutting plate holder.

By changing the direction of rotation between roughing and finishing, in particular changing the direction of relative rotation, the resulting burr can be removed particularly efficiently, which results in both a high working speed and high machining quality. In particular, the burr produced during roughing is removed during finishing against the roughing machining direction, with a finishing machining direction opposite to the roughing machining direction.

The deburring of the recess, in particular the groove, is possible easily and precisely with a cutting insert according to the invention or a cutting insert according to one or more of the exemplary embodiments described above, since these have the deburring blade in the transition area to the base body at the foot or transition end of the puncture projection.

The relative rotation between the workpiece and the inserts can be effected by rotating the workpiece relative to the inserts; however, it is preferably also possible for at least the currently active cutting insert, preferably both cutting inserts, to be rotated relative to the workpiece; it is also possible in a preferred embodiment--particularly when machining on a machining center--that the relative rotation is brought about by both the workpiece and the cutting inserts being moved relative to one another in a suitable manner.

It is preferably possible for the pre-machining to be carried out using a plurality of first cutting inserts. As an alternative or in addition, it is preferably possible for the finish machining to be carried out using a plurality of second cutting inserts. Alternatively or additionally, it is possible that at least one intermediate step between the pre-machining and the finish-machining is carried out with at least one additional cutting insert. It is particularly important that the direction of rotation of the relative rotation between the workpiece and the insert that comes into engagement with the workpiece at the latest before a final finishing step, preferably before a first finishing step, or before the single finishing step, is changed with respect to the direction of rotation in the immediately preceding work step.

According to a development of the invention, it is provided that the first relative rotation between the workpiece and a tool having the first cutting insert and the second cutting insert, in particular a cutting insert holder according to the invention or a cutting insert holder according to one or more of the exemplary embodiments described above, is effected. The second relative rotation is effected between the workpiece and the same tool, in particular the insert holder, with the first insert engaging the workpiece during roughing and the second insert engaging the workpiece during finishing. This is particularly possible with the cutting insert holder according to the invention or a cutting insert holder according to one or more of the exemplary embodiments described above due to the arrangement of the first cutting insert with the first orientation and the second cutting insert with the second orientation on the cutting insert holder. According to a development of the invention, it is provided that the first cutting insert is advanced onto the workpiece for the pre-machining, with the second cutting insert being advanced onto the workpiece for the finish-machining. This includes all possibilities of relative movement between the workpiece and the inserts, in particular that the inserts are displaced while the workpiece is at rest, or that the workpiece is displaced while the inserts are at rest, or that both the workpiece and the cutting inserts are relocated.

According to a development of the invention, it is provided that a toothed shaft is machined as the workpiece. The advantages already described are realized in a special way, in particular due to the discontinuous, interrupted cutting conditions. According to a development of the invention, it is provided that the recess, in particular the groove, is introduced into the workpiece in the hardened or tempered state of the workpiece. The advantages already described are realized in a special way. The workpiece preferably has a hardness of at least 36 HRC and at most 60 HRC. HRC describes the Rockwell hardness on the C scale. According to a development of the invention, it is provided that the method is carried out on a vertical lathe, on a horizontal lathe or on a machining center. These machine tools have proven to be particularly suitable for the process. When using a vertical lathe and when using a horizontal lathe, the relative rotation is preferably effected by rotating the workpiece, with the cutting inserts being held stationary or merely being infed toward the workpiece—particularly radially. In a machining center, a complex relative movement is preferably performed by suitably moving both the workpiece and the inserts to effect the relative rotation.

The invention is explained in more detail with reference to the drawing. show:

FIG. 1 shows a first illustration of an exemplary embodiment of a cutting plate;

FIG. 2 shows a second representation of the cutting plate according to FIG. 1;

FIG. 3 shows an embodiment of a cutting plate kit;

FIG. 4 shows a first representation of an exemplary embodiment of a cutting insert holder;

FIG. 5 shows a second representation of the cutting insert holder according to FIG. 4;

FIG. 6 shows a third representation of the cutting insert holder according to FIGS. 4 and 5;

FIG. 7 shows a workpiece for machining with the cutting plate according to FIG

Figure 1 and the cutting insert holder according to Figure 4, and

FIG. 8 shows a schematic representation of an embodiment of a method for producing a recess, in particular a groove.

1 shows a first representation of an exemplary embodiment of a cutting insert 1. The cutting insert 1 is set up for plunge machining and has a base body 3 and a puncture projection 5 projecting radially from the base body 3. In the exemplary embodiment shown here, the cutting insert 1 is designed as an indexable insert and has two offset in the circumferential direction of the base body 3 to each other Puncture projections 5 on. The puncture projections 5 are preferably of identical design, so that only one of the puncture projections 5 is discussed in more detail below.

The piercing projection 5 has a main cutting edge 9 on a working end 7 facing away from the base body 3 .

Fig. 2 shows a second representation of the cutting plate 1 according to Figure 1.

Elements that are the same and have the same function are provided with the same reference symbols in all figures, so that reference is made to the previous description in each case.

The second representation makes it clear that the puncture projection 5 has a deburring blade 15 on a transition end 11 facing the base body 3 in a transition region 13 to the base body 3 at least on one side—on both sides in the exemplary embodiment shown here. The transition end 11 is also referred to as the base of the puncture projection 5 .

With the deburring blade 15, it is advantageously possible to efficiently and with little effort remove a burr on a workpiece that has arisen during the plunge machining.

In the exemplary embodiment shown here, the puncture projection 5 and the main cutting edge 9 are formed in one piece, in particular of the same material, with the base body 3 .

Also shown is a main plane 17 of the base body 3 and a fastening bore 19 which penetrates the base body 3 perpendicularly to the main plane 17 along an axial direction of the base body 3 and thus of the cutting plate 1 at the same time.

The plunging projection 5 and the main cutting edge 9 are preferably designed and arranged relative to the base body 3 in such a way that cutting forces are introduced tangentially into the base body 3 during the plunging machining of a workpiece. In particular, the main cutting edge 9 extends perpendicularly to the main plane 17, in particular in the axial direction, in particular parallel to the fastening bore 19. The cutting plate 1 preferably has at least one material that is selected from a group consisting of hard metal and cubic crystalline boron nitride. As an alternative or in addition, the cutting plate 1 is coated at least in the area of the piercing projection 5 .

In the area of the main cutting edge 9, a rake face 21 in particular borders on a flank 23 of the cutting plate 1. The main cutting edge 9 preferably forms a cutting line between the rake face 21 and the flank 23.

A cutting edge stabilization geometry 25 is preferably assigned to the main cutting edge 9 . The blade stabilization geometry 25 is preferably selected from a group consisting of a rounding and a chamfer. Fig. 3 shows an illustration of an embodiment of a cutting dpi atten kit 27. The cutting dpi atten kit 27 has a first cutting plate 1.1 and a second cutting plate 1.2. The two cutting inserts 1.1, 1.2 are each preferably designed according to the exemplary embodiment explained above in connection with FIGS. However, a first puncture projection 5.1 of the first cutting insert 1.1 has a first working width B1 which is smaller than a second working width B2 of a second puncture projection 5.2 of the second cutting insert 1.2. In this way, the first cutting insert 1.1 is preferably designed for roughing or pre-machining, while the second cutting insert 1.2 is designed for finishing or finish-machining.

Fig. 4 shows a first representation of an embodiment of a cutting insert holder 29. The cutting insert holder 29 has a central axis M and a first receptacle 31 for fastening a first cutting insert 1.1, in particular the first cutting insert 1.1 of the cutting dpi atten kit 27 according to Figure 3, on which Insert holder 29 on. In addition, the cutting insert holder 29 has a second receptacle 33 for fastening a second cutting insert 1.2, in particular the second cutting insert 1.2 of the cutting insert kit 27 according to FIG. 3, to the cutting insert holder 29. The central axis M defines an axial direction of the cutting insert holder 29. The cutting inserts 1.1, 1.2 are in particular held in the receptacles 31, 33 assigned to them in such a way that their respective axial directions, in particular the fastening bores 19, are parallel to the axial direction, ie to the central axis M. of the insert holder 29 are aligned. It is also shown that the cutting plates 1.1, 12 are preferably fastened to the cutting plate holder 29 by means of fastening means 35 in the form of fastening screws.

The first receptacle 31 and the second receptacle 33 are offset from one another in the circumferential direction about the central axis M, in particular diametrically opposite one another.

The cutting insert holder 29 has an interface 37 which is set up to connect the cutting insert holder 29 to a machine tool.

Fig. 5 shows a second representation of the cutting insert holder 29 according to FIG Recording 31 arranged first cutting insert 1.1 along the circumferential direction has a first orientation, wherein a second, an active main cutting edge 9.2 associated rake face 21.2 of the second cutting insert 1.2 arranged in the second recording 33 has a second orientation along the circumferential direction. The first orientation is opposite to the second orientation—along the circumferential direction. The active main cutting edges 9.1, 9.2 are arranged in an engagement position for machining a workpiece. In the exemplary embodiment shown here, the puncture projections 5.1, 5.2 assigned to the active main cutting edges 9.1, 9.2 point radially inwards in the direction of the central axis M, with the workpiece being arranged in the area of the central axis M of the cutting-bit holder 29 for machining by the cutting inserts 1.1, 1.2.

Due to the different orientation of the cutting faces 21.1, 21.2, between machining the workpiece with first the first cutting insert 1.1 and then the second cutting insert 1.2, a change in the direction of rotation of a relative rotation between the workpiece and the cutting insert holder 29 is required first cutting plate 1.1 and then finish-machined with the second cutting plate 1.2, with a burr that has arisen during the pre-machining being efficiently removed at the same time in the opposite direction to the previous cutting direction.

In particular, the cutting insert holder 29 is matched to the workpiece to be machined in such a way that the first cutting insert 1.1 and the second cutting insert 1.2 are separated from each other and in particular sequentially - can be delivered to the workpiece out - in the radial direction.

6 shows a third representation of the cutting-bit holder according to FIGS. 4 and 5. On the one hand, the different orientation of the first rake face 21.1 and the second rake face 21.2 along the circumferential direction becomes clear again. On the other hand, it is shown here that the interface 37 can be designed as a VD 140 receptacle in a preferred embodiment. However, in an equally preferred configuration, it can alternatively also be designed in particular as a steep taper interface, Morse taper interface, HSK interface or in some other suitable manner.

FIG. 7 shows a representation of a workpiece 39 for machining with the cutting plate 1 according to FIG. 1 and the cutting plate holder according to FIG. 4. The workpiece 39 is designed in particular as a toothed shaft. By means of the cutting plate 1, in particular the first cutting plate 1.1 and the second cutting plate 1.2, in particular by means of the cutting dpi atten- kit 27, in particular by means of the cutting plate holder 29, a puncture 40, in particular an annular groove 41, in particular a circlip groove, is preferably made in the workpiece 39 , brought in. This results in a special way in the advantages described above, since precisely because of the discontinuous cutting conditions prevailing in the area of the toothing, high stability is important for the cutting inserts 1.1, 1.2 and burr formation occurs to a particular extent.

Fig. 8 shows a schematic representation of an embodiment of a method for producing a recess 40, in particular a groove, in particular the annular groove 41 in the workpiece 39 according to Figure 7.

As part of the method, the workpiece 39 is first pre-machined by piercing a preliminary puncture having a first width with the first cutting plate 1.1, which has the first working width B1, which is also referred to as roughing. A rotation of the workpiece 39 relative to the first cutting plate 1.1, in particular to a tool 43, in particular to the cutting plate holder 29, is effected with a first direction of rotation. In particular, the workpiece 39 is preferably arranged for this purpose in the area of the central axis M of the cutting insert holder 29, with the first cutting insert 1.1 first being infed—in the radial direction—onto the workpiece 39. Thereafter, the workpiece is finish-machined by expanding the pre-cut to a second width, which is greater than the first width, with the second cutting plate 1.2, which has the second working width B2, which is also referred to as finishing. This is possible because the second working width B2 is greater than the first working width B1. In this way, the recess 40, in particular the annular groove 41, is produced. During finish machining, the workpiece 39 rotates relative to the second cutting insert 1.2 in a second direction of rotation, which is opposite to the first direction of rotation of the roughing operation. In particular, the relative rotation with the second direction of rotation is effected relative to the same tool 43, in particular to the insert holder 29, relative to which the first relative rotation with the first direction of rotation was also effected. The resulting recess 40, in particular the annular groove 41, is deburred during finish machining, ie finishing, by means of the second cutting plate 1.2, in particular with its deburring blade 15.2. This happens particularly efficiently because the burr is cut off in the opposite direction to where it originated. For the finish machining, the second cutting insert 1.2 is advanced toward the workpiece 39—in the radial direction.

The relative rotations are effected in particular between the cutting plate holder 29 and the workpiece 39 in each case. Since the cutting inserts 1.1, 1.2 are arranged with the opposite orientation on the cutting insert holder 29, it is possible to reverse the direction of the relative rotation between the pre-machining with the first cutting insert 1.1 and the finishing with the second cutting insert 1.2, so that the burr is cut off in the opposite direction to where it originated can. In particular, only the first cutting insert 1.1 is in engagement with the workpiece 39 during the pre-machining, while the second cutting insert 1.2 is not in engagement with the workpiece 39. Only the second cutting insert 1.2 is in engagement with the workpiece 39 during the finish machining, while the first cutting insert 1.1 is not in engagement with the workpiece 39.

The recess 40, in particular the annular groove 41, is preferably made in the workpiece 39 in a hardened or tempered state. The workpiece 39 preferably has a hardness of at least 36 HRC and at most 60 HRC.

The method is preferably carried out on a vertical lathe, on a horizontal lathe or on a machining center.

Claims

EXPECTATIONS

1. Cutting insert holder (29), with a central axis (M) and at least one first receptacle (31) for fastening a first cutting insert (1.1) to the cutting insert holder (29), and with at least one second receptacle (33) for fastening at least one second Cutting insert (1.2) on the cutting insert holder (29), the first receptacle (31) and the second receptacle (33) being offset from one another in the circumferential direction about the central axis (M), the first receptacle (31) and the second receptacle ( 33) are designed and arranged in such a way that a first rake face (21.1), assigned to an active main cutting edge (9.1), of a first cutting insert (1.1) arranged in the first receptacle (31) has a first orientation along the circumferential direction, with a second, one active main cutting edge (9.2) associated chip face (21.2) of a second cutting plate (1.2) arranged in the second receptacle (33) has a second orientation along the circumferential direction, w wherein the first orientation is opposite to the second orientation when the first cutting tip (1.1) and the second cutting tip (1.2) are attached to the cutting tip holder (29).

2. The cutting insert holder (29) according to claim 1, wherein the cutting insert holder (29) is matched to a workpiece (39) to be machined in such a way that a first cutting insert (1.1) arranged on the at least one first receptacle (31) and a first cutting insert (1.1) on the at least second cutting plate (1.2) arranged in a second receptacle (33) can be advanced onto the workpiece (39) separately from one another and, in particular, one after the other.

3. Cutting plate (1) for plunge machining, with a base body (3) and a puncture projection (5) projecting radially from the base body (3), the puncture projection (5) at a working end (7) facing away from the base body (3) having a Having main cutting edge (9), and wherein

- the piercing projection (5) has a deburring blade (15) on at least one side at a transition end (11) facing the base body (3) in the transition region (13) to the base body (3).

4. Cutting plate (1) according to claim 3, wherein the puncture projection (5) at its transition end (11) has a deburring blade (15) on both sides.

5. Cutting insert (1) according to any one of the preceding claims 3 or 4, wherein the

Plunging projection (5) and the main cutting edge (9) are designed and arranged relative to the base body (3) that cutting forces during the puncture processing of a

Workpiece (39) are introduced tangentially into the base body (3).

6. Cutting plate (1) according to any one of the preceding claims 3 to 5, wherein the cutting plate (1) comprises at least one material which is selected from a

Group consisting of hard metal and cubic crystalline boron nitride, and/or the cutting plate (1) is coated at least in the area of the piercing projection (5).

7. Cutting insert (1) according to any one of the preceding claims 3 to 6, wherein the

Main cutting edge (9) is assigned at least one cutting edge stabilization geometry (25), the at least one cutting edge stabilization geometry (25) preferably being selected from a group consisting of a rounding and a chamfer.

8. Cutting insert (1) according to any one of the preceding claims 3 to 7, wherein the

The cutting plate (1) is designed as an indexable cutting plate, the cutting plate (1) having at least two piercing projections (5) which are offset in relation to one another in a circumferential direction of the base body (3).

9. cutting dpi atten kit (27), with a first cutting plate (El) according to any one of claims 3 to 8, and with a second cutting plate (1.2) according to any one of claims 3 to 8, wherein the puncture projection (5.1) of the first Cutting plate (1.1) has a first working width (Bl), and wherein the puncture projection (5.2) of the second cutting plate (1.2) has a second working width (B2), and wherein the second working width (B2) is greater than the first working width (Bl) .

10. A method for producing a recess (40), in particular a groove, in particular an annular groove (41), in a workpiece (39), in particular a toothed shaft, with the following steps:

- Pre-machining of the workpiece (39) by piercing a pre-pierce having a first width with a first cutting plate (1.1), in particular a first cutting plate (1.1) according to one of claims 3 to 8, wherein a relative rotation of the Workpiece (39) to the first cutting plate (1.1) is effected with a first direction of rotation;

- Finishing the workpiece (39) by widening the pre-groove to a second width, which is greater than the first width, and thus producing the groove (40), with a second cutting plate (1.2), in particular a second cutting plate (1.2) according to a of claims 3 to 8, wherein a relative rotation of the workpiece (39) to the second cutting plate (1.2) is effected with a second direction of rotation, wherein the second direction of rotation is opposite to the first direction of rotation, and wherein the resulting recess (40) during finishing by means of the second cutting plate (1.2) is deburred.

11. The method according to claim 10, wherein the first relative rotation between the workpiece (39) and a tool (43) having the first cutting insert (1.1) and the second cutting insert (1.2), in particular a cutting insert holder (29) according to one of claims 1 or 2, is effected, the second relative rotation being effected between the workpiece (39) and the same tool (43), with the first cutting plate (1.1) being in engagement with the workpiece (39) during the pre-machining, with the second Cutting insert (1.2) is in engagement with the workpiece (39).

12. The method according to claim 10 or 11, wherein the first cutting insert (1.1) is advanced onto the workpiece (39) for the pre-machining, the second cutting insert (1.2) being advanced onto the workpiece (39) for the finish machining.

13. The method according to any one of claims 10 to 12, wherein a splined shaft is machined as the workpiece (39).

14. The method according to any one of claims 10 to 13, wherein the recess (40) is made in the workpiece (39) in the hardened or tempered state of the workpiece (39), the workpiece (39) preferably having a hardness of at least 36 HRC to has a maximum of 60 HRC.

15. The method according to any one of claims 10 to 14, wherein the method is carried out on a vertical lathe, on a horizontal lathe or on a machining center.