Tool and cutting plate thereof

Abstract

A tool (2) is provided: comprising at least one cutting plate (4) for machining a workpiece; comprising a carrier (6) having a plate seat (8) for the cutting plate (4); wherein the cutting plate (4) comprises a cutting edge (10) for machining the workpiece; wherein the cutting plate (4) comprises a cutting corner (12) at which the cutting edge (10) terminates; wherein the cutting plate (4) comprises a lateral face (24) having a contact face (26) and a clearance face (28); wherein the contact surface (26) adjoins the plate seat (8); wherein the clearance surface (28) is defined by the cutting edge (10); wherein, at least at the cutting corner (12), the clearance surface (28) protrudes with respect to the contact surface (26). Furthermore, a corresponding cutting plate (4) for such a tool (2) is provided.

Description

Background Art

[0001] The present invention relates to a tool and a cutting plate thereof, in particular to an indexable insert plate.

[0002] One or more cutting plates are usually fastened to the carrier of the tool and are therefore replaceable. The tool and therefore the insert rotates around the axis of rotation during operation. In this way, a workpiece can be machined, wherein by means of the cutting plates, chips can be lifted away from the workpiece.

[0003] A tool having a cutting plate is disclosed, for example, in WO 95 07784 A1.

[0004] The cutting plate usually comprises at least one cutting corner which is subjected to great stress during machining of the workpiece and may be susceptible to fracture. The design of the cutting corner is particularly important for cutting performance and stability at low axial depths and possible chatter. Summary of the invention

[0005] Problem of the Invention

[0006] With this in mind, the problem addressed by the present invention is to specify an improved cutting plate. It is desirable that the cutting plate be as stable as possible, especially in the cutting corners. Furthermore, a correspondingly improved tool will be specified.

[0007] Solution to the problem

[0008] The problem is solved according to the invention by a tool having the features according to claim 1 and a cutting plate having the features according to claim 12. Advantageous configurations, further developments and variants are the subject matter of the dependent claims. Statements made in connection with the tool also apply to the cutting plate and vice versa.

[0009] The core idea of ​​the invention is in particular to design the lateral surface of the cutting plate in a targeted manner so that the cutting plate is reinforced, in particular in the area of ​​the cutting corner and in particular below the cutting corner, and is thereby particularly stable. The lateral surface is designed so that as much material as possible can be used at the cutting corner, i.e. the cutting plate is configured as robustly as possible here, but at the same time the lateral surface is also designed so that the cutting plate can be mounted in a designated plate seat of the tool. According to the invention, for this purpose, the lateral surface is divided into several sub-surfaces and is in particular not formed as a simple planar surface. This allows a high degree of design freedom, so that the cutting corner is reinforced, in particular in the presence of a plate seat.

[0010] The tool according to the invention comprises at least one cutting plate for machining a workpiece. A cutting plate is also referred to as an insert. In addition, the tool comprises a carrier having a plate seat (also: recess) for a cutting plate. In particular, in the case of a plurality of cutting plates, the carrier itself in particular has a plate seat for each cutting plate. The cutting plate is attached to the carrier, in particular fastened in the plate seat. For example, the cutting plate comprises a through hole, through which a screw passes and is then screwed into the plate seat so that the cutting plate is fastened to the carrier. In the present case, without limiting the generality of the invention, a tool with a plurality of cutting plates is assumed and is also preferred, but the embodiments are generally also applicable to a tool with only one cutting plate. The cutting plates are regularly or irregularly distributed on the carrier and are fastened to the carrier in a single row or in multiple rows.

[0011] The tool is preferably a rotary tool and rotates during operation about an axis of rotation corresponding to the longitudinal axis of the carrier. In a suitable configuration, the tool is configured as a milling tool, such as a 90° shoulder drill. The plate seat and the cutting plate are arranged to be spaced apart from the axis of rotation in a radial direction (perpendicular to the longitudinal axis). In the present case, without limiting the generality of the invention, this milling tool is assumed, but the embodiments are also similarly applicable to drills, lathes and tools, for example, with a cutting plate centrally positioned on the longitudinal axis.

[0012] The cutting plate according to the invention comprises (at least) one cutting edge for machining a workpiece. The cutting plate further comprises (at least) one cutting corner, at which the cutting edge terminates. In general, the cutting edge specifically comprises two ends, one end being the aforementioned cutting corner and the second end being another corner of the cutting plate, which is not necessarily also a cutting corner. The cutting corner is preferably rounded or chamfered, alternatively pointed. The cutting corner and the cutting edge are typically part of the circumferential profile of the front side (also: top side) of the cutting plate.

[0013] The cutting plate generally extends in an x-direction, a y-direction and a z-direction, which are perpendicular to each other in pairs. The x-direction specifically corresponds to the direction of the longitudinal axis and is also referred to as the axial direction. The y-direction specifically corresponds to the radial direction. The z-direction is also referred to as the tangential direction. Then, the cutting plate has a length in the x-direction, a width in the y-direction and a height in the z-direction.

[0014] The cutting plate further comprises a rear side (also: bottom side) opposite the front side. The rear side is preferably planar; this is not mandatory for the front side. The height of the cutting plate is the maximum distance between the front side and the rear side measured in the z-direction. Below the cutting corner, the rear side specifically comprises a corresponding (rear) corner, which is connected to the cutting corner via an edge. Therefore, this edge is located below the cutting corner and is also referred to as the cutting corner edge. Therefore, the cutting plate comprises a cutting corner edge extending from the cutting corner to the rear corner. The cutting corner edge is preferably rounded or chamfered, alternatively pointed, similar to the cutting corner. The cutting corner edge extends approximately in the z-direction, but is typically placed at a certain angle relative to the z-direction, so that the cutting plate extends from the rear side and widens towards the front side, i.e. the width and length increase.

[0015] The cutting plate also includes (at least) one lateral surface, which has a contact surface and a clearance surface. Therefore, the lateral surface is subdivided into two sub-surfaces, one is the clearance surface and the other is the contact surface (alternatively, the entire lateral surface can also be equivalently regarded as a clearance surface, and the contact surface is then integrated into the clearance surface, thereby forming a contact surface and a residual clearance surface). In the above-mentioned disclosure WO 9507784A1, such a subdivision is not given. The lateral surface is specifically divided into a clearance surface on the one hand and a contact surface on the other hand by an imaginary separation line. The clearance surface and the contact surface are separated by a separation line, that is, the clearance surface is located on one side of the separation line, the contact surface is located on the other side, and the two are quasi-jointly connected at the separation line. The precise transition from the clearance surface to the contact surface at the separation line will be described in more detail below.

[0016] The contact surface abuts the plate seat and thus serves as an abutment surface for abutting with the carrier. Preferably, the contact surface is completely covered by the plate seat. Typically, the contact surface is placed obliquely (i.e. at an angle greater than 0° to the z-direction) so that it is pulled into the plate seat when the cutting plate is tightened. The contact surface itself is preferably planar, i.e. flat, alternatively, the contact surface may be curved, for example in the case of a round cutting plate ("round plate").

[0017] The clearance face is defined by the cutting edge, i.e., the clearance face ends at the cutting edge. When viewed in particular in the z-direction, the clearance face protrudes and projects beyond the plate seat, such that the cutting edge can engage with the workpiece during operation. Preferably, the clearance face extends along the entire cutting edge. The clearance face is located between the cutting edge and the contact face, such that the contact face does not extend to the cutting edge.

[0018] According to the present invention, at least at the cutting corner, the clearance face protrudes beyond the contact face, specifically perpendicular to the z direction. Therefore, the cutting plate is advantageously reinforced in the region of the cutting corner, specifically starting from the cutting corner, and is reinforced completely or partially along the cutting corner edge. Due to the protruding clearance face, the cutting plate is more firmly formed there, i.e., has more material, thereby improving stability. This is mainly achieved in the region of the cutting corner, but it is also advantageous along the entire cutting edge. Therefore, compared with the above-mentioned disclosure WO 95 07784A1, the clearance face is not only a continuation of the contact face in the direction of the cutting edge, but the construction of the clearance face is different from the contact face. In other words, the clearance face is designed independently of the contact face, i.e., the purpose is to achieve the reinforcement of the cutting plate at least in the region of the cutting corner. It is particularly important that the clearance face is not only protruding itself, for example, not only protruding in the x-direction and / or y-direction and protruding at a certain angle to the z-direction, but the clearance face also protrudes about (i.e., relative to) the contact face. In other words, the contact face is used as a reference plane, and the clearance face protrudes outwards about the reference plane. In this case, there may generally be two variants, one variant being a simple kink in the lateral surface, so that the clearance surface and the contact surface extend at different angles (angled arrangement of the clearance surface and the contact surface), and the other variant being a step, so that the clearance surface is offset from the contact surface (offset arrangement of the clearance surface and the contact surface). Both variants will be discussed in further detail below. Both variants may also be combined with each other.

[0019] The phrase "at the cutting corner" means in particular an area adjacent to and / or in the immediate vicinity of the cutting corner, in particular the part of the lateral surface which is located below the cutting corner, i.e. starting from the cutting corner and between said cutting corner and the rear side of the cutting plate, in particular along the cutting corner edge. The aforementioned area extends laterally from the cutting corner (or generally from the cutting corner edge), i.e. perpendicularly thereto, for example over a length of 1% to 50% of the length of the cutting edge. However, more important than the precise description of the range is that the cutting corner is reinforced by the raised clearance surface and the cutting plate is correspondingly stronger there, in particular compared to the case of a non-raised clearance surface.

[0020] As already described, the clearance face and the contact face are separated by a separation line. In an advantageous embodiment, this separation line has an S-shaped or L-shaped curve, typically a curved line. In the case of an S-shaped path, the separation line extends in the direction of the cutting corner edge with a first curvature, first descending in the direction of the rear side, so as to then extend again in the direction of the cutting corner edge with a second curvature, the curvature of the second curvature being opposite to the first curvature. Therefore, the separation line is bent twice. On the other hand, in the case of an L-shaped curve, the separation line is bent only once, i.e. first extending in the direction of the cutting corner edge, then bending towards the rear side at the kink point, so that the separation line includes a total of two legs, i.e. a horizontal leg and a vertical leg. The legs form an angle, which is preferably between 50° and 130°, specifically 90°. Alternatively or in addition, the clearance face and the contact face meet at the separation line, which extends along the lateral surface in the direction of the cutting corner edge and only descends towards the rear side of the cutting plate. Due to the S-shaped or L-shaped path of the separation line, which usually runs in the direction of the rear side, the height of the clearance face in the direction of the cutting corner edge increases, and the cutting corner is reinforced accordingly, because the greater height of the clearance face in the region of the cutting corner now means that the cutting plate is more rigid. In principle, however, the separation line can also simply be straight, so that an advantageous reinforcement is already achieved at the cutting corner.

[0021] Preferably, the clearance face and the contact face are connected via a chamfered transition, in particular a hollow groove. The chamfered transition has an inner diameter. In particular, the chamfered transition refers to a groove or a track across the lateral face. The chamfered transition in particular facilitates the production of the cutting plate, in particular when the cutting plate is produced by a die casting process or the like. Due to the chamfered transition, the cutting plate is more easily deformed during manufacturing. In particular, the chamfered transition extends completely or partially along the separation line and in particular follows the path of the separation line.

[0022] In a first suitable variant, in order to form the gap face as protruding with respect to the contact face, the gap face is offset from the contact face by a step. The step extends completely or partially along the separation line and follows its path accordingly. The step specifically causes the gap face to protrude with respect to the contact face. Therefore, the gap face is specifically displaced in the x-direction or y-direction with respect to the contact face. In the case of the step, the gap face specifically represents a shoulder with respect to the contact face. The gap face protruding due to the step is also called a balcony because the appearance of the gap face is similar to a building with a balcony. In general, due to the offset gap face, the step causes the cutting plate to be formed to be stronger than when there is no step. Therefore, the cutting corner is advantageously reinforced and particularly stable. The gap face has a gap angle that is smaller, larger or the same as the gap angle of the contact face.

[0023] In a suitable second variant, in order to form the gap surface as a protrusion with respect to the contact surface, the gap surface has a larger gap angle (in short: "angle") than the contact surface. The gap angle specifically refers to the angle formed by the lateral surface and the workpiece when machining the workpiece. This gap angle is preferably positive, so that a specifically wedge-shaped intermediate space is given between the workpiece and the lateral surface during machining. In the above-mentioned publication WO 95 07784A1, the gap angle on the lateral surface is specifically constant between the front side and the rear side. In contrast, in the current case, the gap angle is now variable, that is, so that the gap angle varies between the contact surface and the gap surface. The gap angle of the contact surface is specifically specified by the plate seat of the carrier. However, along the gap surface, the gap angle can advantageously vary. If the same gap angle as the contact surface is used, the gap surface is preferably at least offset with respect to the contact surface. However, in the current case, in the second variant, it is convenient to be able to design the gap surface as required so as to strengthen the cutting plate at least at the cutting corners. Specifically, the gap angle of the gap face is greater than the gap angle of the contact face, so that when viewed from the rear side to the front side, the widening degree of the cutting plate along the gap face is much greater than the widening degree along the contact face. The gap angle of the contact face is preferably in the range of 0 ° to 20 °. The gap angle of the gap face is preferably in the range of 0 ° to 35 °. If there is no additional step, different gap angles at least cause a kink in the lateral face. This kink extends completely or partially along the separation line and follows its path accordingly. Starting from the cutting edge and observed in the direction of the rear side, the gap angle of the gap face can be constant or can vary along the gap face. Also observed along the cutting edge, that is, depending on whether the orientation is in the x-direction or the y-direction, the gap angle can be constant or can vary. On the other hand, the gap angle of the contact face is preferably constant over the entire contact face, so that the contact face is configured to be generally planar and therefore optimally abuts the plate seat.

[0024] It is also possible to combine the two variants described above for the transition at the separation line (first variant and second variant), so that the clearance surface is then offset by a step from the contact surface while having a different, in particular larger, clearance angle.

[0025] Preferably, the clearance face extends to the rear side of the cutting plate at the cutting corner. In other words, the clearance face extends along the entire cutting corner edge, so that the cutting corner is reinforced to the greatest extent and is particularly stable. In this way, the cutting plate is reinforced along the entire cutting corner edge. In particular, in the case of a step, usually in particular a foot is also formed by the clearance face, on which the cutting corner stands as it were. Depending on the configuration, the foot, i.e. in particular the corresponding corner of the rear side, protrudes beyond the plate seat or adjoins the plate seat. In general, the foot can also be positioned below the plate seat, but this is preferably avoided.

[0026] The clearance surface has a height, which is measured between the cutting edge (i.e., the top side) and the contact surface (i.e., the separation line). In a convenient embodiment, the height varies along the cutting edge, i.e., the separation line and the cutting edge do not extend parallel to each other. This can be achieved alternatively or incrementally in a variety of ways, i.e., the cutting edge extends in a curved manner, the separation line (particularly, a step or kink) extends in a curved manner, or the separation line and the cutting edge each extend in a straight manner but not parallel to each other. In general, the varying height increases the design freedom of the cutting plate and can also strengthen the cutting corners in a targeted manner without forming other areas of the cutting plate too firmly, thereby saving material.

[0027] Similarly, the contact surface also has a height, which is then measured from the clearance surface (ie, the separation line) towards the rear side. For example, the contact surface preferably has a constant height, but this is not mandatory, depending on the design of the plate seat.

[0028] The shape of the cutting plate is suitably polygonal, having a circumferential profile defining the front side and a plurality of edges, one or more or all of which are formed as cutting edges. In the present case, without limiting the generality of the invention, a rectangular quadrilateral cutting plate is assumed with four edges and four corners, two of which are formed as opposite cutting corners. Therefore, there are also four lateral faces, one for each edge (specifically, cutting edge). Not every lateral face has to be divided into a contact face and a clearance face, but this is preferred, in particular for indexable insert plates. In a preferred configuration, the cutting plate is an indexable insert plate. Specifically, the indexable insert plate comprises one or more mirrored planes (parallel to the z-direction) and / or at least two-digit rotational symmetry (around the z-direction) so that it can be mounted at different positions in the plate seat depending on the position when machining the workpiece, and different cutting edges and cutting corners are utilized.

[0029] The previous statements about the cutting edge and the lateral surface adjacent to this cutting edge also apply similarly, specifically to one, more than one or all other cutting edges and lateral surfaces of the cutting plate. In a suitable configuration, in addition to the (first) cutting edge, the cutting plate accordingly includes another (second) cutting edge, which also terminates at the cutting corner, so that the cutting corner is now framed by the two aforementioned cutting edges. The cutting edges do not necessarily have the same length, for example, one cutting edge is a short cutting edge, and the other cutting edge is a long cutting edge. In the case of a quadrilateral cutting plate, the cutting edges form an angle of preferably 90° (rectangular or square cutting plates), and it is also suitable that the angle is in the range of 50° to 140° (rhombus or parallelogram cutting plates). Triangular and substantially polygonal cutting plates are also suitable. In addition, in addition to the (first) lateral surface, the cutting plate also includes another (second) lateral surface, which has another (second) contact surface and another (second) clearance surface. Then, the aforementioned clearance surface is the first clearance surface, and the contact surface is similarly the first contact surface. Another contact surface is also adjacent to the plate seat. Another clearance surface is defined by another cutting edge. Similar to the first clearance surface, the other clearance surface also protrudes relative to the other contact surface at least at the cutting corner. The advantages mentioned so far apply similarly. The lateral surfaces, specifically the separation lines, are not necessarily the same, nor are they necessarily mirror images of each other, but can also be designed independently of each other. In this way, many different suitable embodiments are possible. Conveniently, the two separation lines meet at the edge of the cutting corner. In a favorable embodiment, the two separation lines together form a U-shape or a V-shape, with the top end facing the direction of the rear side, so that, specifically, the cutting corner is reinforced. Alternatively or in addition, the separation line of one lateral surface is straight and the separation line of the other lateral surface is S-shaped. Alternatively or in addition, both separation lines are S-shaped or L-shaped, and / or are configured to be mirror images of each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Exemplary embodiments of the present invention are explained in more detail below with the aid of the accompanying drawings. The accompanying drawings schematically show:

[0031] Figure 1 For tools,

[0032] Figure 2 A perspective view of the cutting board.

[0033] Figure 3 for Figure 2 Rear view of the cutting plate,

[0034] Figure 4 for Figure 2 Side view of the cutting plate in

[0035] Figure 5 for Figure 2 Different side views of the cutting plate,

[0036] Figure 6 A variation of the cutting plate.

[0037] Figure 7 Another variation of the cutting plate.

[0038] Figure 8 Another variation of the cutting plate.

[0039] Fig. 9 for lateral surfaces with different separation lines,

[0040] Fig.10 For a cutting plate with a kink,

[0041] Fig.11 A cutting plate with steps. DETAILED DESCRIPTION

[0042] Figure 1 An exemplary embodiment of a tool 2 according to the invention is shown. The tool comprises at least one, in this case even six, cutting plates 4 for machining a workpiece (not shown). Figures 2 to 8 Various exemplary embodiments of cutting plates 4 are shown in . The tool 2 comprises a carrier 6 having a plate seat 8 for the cutting plates 4. The respective cutting plate 4 is attached to the carrier 6 and is therefore fastened in one of the plate seats 8 by means of screws in this case.

[0043] In this case, the tool 2 is a rotary tool and rotates during operation about an axis of rotation corresponding to the longitudinal axis L of the carrier 6. The tool 2 shown here is configured as a milling tool, in particular as a 90° shoulder drill. The plate seat 8 and the cutting plate 4 are arranged spaced apart from the axis of rotation in a radial direction (perpendicular to the longitudinal axis L). However, in general, the following statements also apply analogously to other tools.

[0044] Figures 2 to 8 Various embodiments of the cutting plate 4 are shown in Figures 2 to 5 Various views of the same cutting plate 4 are shown. The cutting plate 4 comprises at least one cutting edge 10 (here four cutting edges 10) for machining a workpiece. The cutting plate 4 further comprises a cutting corner 12 (here, for example, two cutting corners 12), at which the cutting edge 10 terminates. Generally speaking, the cutting edge 10 comprises two ends, one end being the aforementioned cutting corner 12 and the second end being another corner 14, which is not necessarily also a cutting corner 12. For example, the cutting corner 12 is rounded here, but alternatively it may also be chamfered or pointed (not shown). The cutting corner 12 and the cutting edge 10 are usually part of the circumferential contour of the front side 16 (also: top side) of the cutting plate 4.

[0045] The cutting plate 4 generally extends in an x-direction X, a y-direction Y and a z-direction Z, which are perpendicular to each other in pairs. The x-direction X corresponds to the direction of the longitudinal axis L and is also referred to as the axial direction. The y-direction specifically corresponds to the radial direction. The z-direction is also referred to as the tangential direction. Thus, the cutting plate 4 has a length in the x-direction X, a width in the y-direction Y and a height in the z-direction Z.

[0046] The cutting plate 4 also includes a rear side 18 (also: bottom side) opposite the front side 16. The rear side 18 can be Figure 3 Below the cutting corner 12, the rear side 18 comprises a corresponding (rear) corner 20, which is connected to the cutting corner 12 via an edge 22. This edge 22 is therefore located below the cutting corner 12 and is also referred to as a cutting corner edge 22. The cutting corner edge 22 extends from the cutting corner 12 to the rear corner 20. Similar to the cutting corner 12, the cutting corner edge 22 is rounded here. The cutting corner edge 22 extends approximately in the z-direction Z, but is usually placed at a certain angle relative to the z-direction, so that the cutting plate 4 extends from the rear side 18 and widens towards the front side 16, i.e. the width and length increase. This can be seen in FIG. Figure 4 and 5 The rear side 18 of the cutting plate 4 can be overlapped in the x-direction and the y-direction with respect to the cutting edge 10 or the front side 16, or can also be twisted. The rear side 18 can also be slightly twisted toward the front side 16.

[0047] The cutting plate 4 further comprises a lateral surface 24 having a contact surface 26 and a clearance surface 28, so that the lateral surface 24 is further divided into two sub-surfaces. Here, the lateral surface 24 is divided into the clearance surface 28 on the one hand and the contact surface 26 on the other hand by an imaginary separation line T. The clearance surface 28 is located on one side of the separation line T, and the contact surface 26 is located on the other side, and the two are connected in a quasi-joined manner at the separation line T. Fig. 9 By way of example, three possible separation lines T are shown for the notional lateral surface 24. These separation lines T have different courses, more specifically, they also connect to the cutting corner edge 22 in different ways.

[0048] The contact surface 26 abuts against the plate seat 8. Typically, as Figures 2 to 8 As can be seen in FIG. 2 , the contact surface 26 is disposed obliquely (ie at an angle greater than 0° to the z-direction Z) so that when the cutting plate 4 is tightened, it is pulled into the plate seat 8. The contact surface 26 itself is also planar.

[0049] A clearance face 28 is defined by the cutting edge 10 and, when viewed in the z-direction Z, projects and protrudes beyond the plate seat 8 so that the cutting edge 10 can engage with a workpiece during operation. In the configuration shown herein, the clearance face 28 extends along the entire cutting edge 10. The clearance face 28 is located between the cutting edge 10 and the contact face 26 so that the contact face does not extend to the cutting edge 10.

[0050] At least at the cutting corner 12, the clearance surface 28 is raised relative to the contact surface 26. This can be Figure 2 , 6 , 7 and 8. Therefore, the cutting plate 4 is reinforced in the area of ​​the cutting corner 12, that is, starting from the cutting corner 12, completely along the cutting corner edge 22 (such as Figure 2 as shown) or partially along the cutting corner edge 22 (as shown Figure 6 , 7 and 8). The clearance surface 28 is designed independently of the contact surface 26, i.e. the purpose is to achieve reinforcement of the cutting plate 4 at least in the area of ​​the cutting corner 12. It is important that the clearance surface 28 not only protrudes per se, for example not only protrudes in the x-direction X and / or the y-direction Y and protrudes at a certain angle to the z-direction Z, but that the clearance surface 28 also protrudes with respect to (i.e. relative to) the contact surface 26. In other words, the contact surface 26 serves as a reference plane and the clearance surface 28 protrudes outwardly with respect to the reference plane. In this case, there may generally be two variants, one variant being a simple kink 30 in the lateral surface 24, so that the clearance surface 28 and the contact surface 26 extend at different angles F1, F2 (angled arrangement of the clearance surface 28 and the contact surface 26), and the other variant being a step 32, so that the clearance surface 28 is offset from the contact surface 26 (offset arrangement of the clearance surface 28 and the contact surface 26). The variant with the kink 30 is Fig.10 It is shown in Fig.10 24. Similarly, the variant with step 32 is shown in FIG. Fig.11 It is shown in Fig.11 A cross-sectional view of the lateral surface 24 is also shown. The step 32 may also be Figures 2 to 8 Both variants can also be combined with each other.

[0051] The phrase “at the cutting corner 12 ” means an area adjacent to and / or just adjacent to the cutting corner 12 , specifically the portion of the lateral surface 24 located below the cutting corner 12 , i.e. starting from the cutting corner 12 and between the cutting corner and the rear side 18 , specifically along the cutting corner edge 22 .

[0052] The path of the separation line T is formed by the kink 30 or the step 32, so the separation line T is Figures 2 to 8 The separation line T has, for example, an S-shaped path (see Figure 6, 7 , 8, 9) or an L-shaped path (see Figure 2 , 9 ), usually a curved path. In the case of an S-shaped path, the separation line T extends in the direction of the cutting corner edge 22 with a first curvature, first descending in the direction of the rear side 18, so as to then extend again in the direction of the cutting corner edge 22 with a second curvature, the curvature of the second curvature being opposite to the first curvature. On the other hand, in the case of an L-shaped curve, the separation line T is bent only once, i.e. first extending in the direction of the cutting corner edge 22 and then bending towards the rear side 18 at the kink point, so that the separation line T comprises a total of two legs, i.e. a horizontal leg and a vertical leg. Alternatively or in addition, the clearance surface 28 and the contact surface 26 meet at the separation line T, which extends along the lateral surface 24 in the direction of the cutting corner edge 22 and only descends towards the rear side 18 of the cutting plate 4. Due to the generally S-shaped or L-shaped path of the separation line T in the direction of the rear side 18, the height of the clearance face 28 in the direction of the cutting corner edge 22 increases, and the cutting corner 12 is correspondingly reinforced, because the greater height of the clearance face 28 in the region of the cutting corner 12 now means that the cutting plate 4 is stronger. In principle, however, the separation line T can also simply be straight (see Figure 2 , 6 , 9), so that reinforcement is already achieved at the cutting corner 12.

[0053] In the present case, the clearance surface 28 and the contact surface 26 are connected via a chamfered transition such as a hollow groove, i.e. Figures 2 to 8 In the embodiment shown in FIG. 2 , the step 32 comprises a chamfered transition, so that a transition with an inner diameter is achieved between the clearance surface 28 and the contact surface 26 .

[0054] In a first variant, in order to form the clearance surface 28 as a protrusion relative to the contact surface 26, the clearance surface 28 is offset from the contact surface 26 by a step 32, such as Figures 2 to 8 and 11. The step 32 extends completely or partially along the separation line T and follows its path accordingly. The step 32 causes the clearance surface 28 to protrude relative to the contact surface 26. Therefore, the clearance surface 28 is displaced in the x-direction X or the y-direction Y relative to the contact surface 26. In the case of the step 32, the clearance surface 28 represents a shoulder relative to the contact surface 26. The clearance surface 28 protruding due to the step 32 is also called a balcony because the appearance of the clearance surface is similar to that of a building with a balcony. In general, due to the offset clearance surface 28, the step 32 makes the cutting plate 4 stronger than when there is no step 32. This reinforces the cutting corner 12.

[0055] In the second variant, in order to form the clearance surface 28 to be raised with respect to the contact surface 26, the clearance surface 28 has a larger clearance angle F1, F2 than the contact surface 26, such as Fig.10, which is shown by way of example. The clearance angles F1, F2 refer to the angles formed by the lateral surface 24 and the workpiece when machining the workpiece. In the present case, these clearance angles F1, F2 are positive values. In the present case, the clearance angles F1, F2 are now variable, i.e., such that the clearance angles F1, F2 vary between the contact surface 26 and the clearance surface 28. The clearance angle F1 of the contact surface 26 is specified by the plate seat 8 of the carrier 6. However, along the clearance surface 28, the clearance angle F2 may also vary. In the present case, the clearance angle F2 of the clearance surface 28 is greater than the clearance angle F1 of the contact surface 26, so that when viewed from the rear side 18 to the front side 16, the widening of the cutting plate 4 along the clearance surface 28 is much greater than the widening along the contact surface 26. Starting from the cutting edge 10 and viewed in the direction of the rear side 18, the clearance angle F2 of the clearance surface 28 is constant (see Fig.10 ), or varies along the clearance face 28 (not shown). Also viewed along the cutting edge 10, i.e., depending on the orientation in the x-direction X or in the y-direction Y, the clearance angle F2 may be constant or vary. On the other hand, the clearance angle F1 of the contact face 26 is constant over the entire contact face 26, so that the contact face is configured as a generally planar surface.

[0056] exist Figures 2 to 5 In the exemplary embodiment of the present invention, the clearance face 28 extends to the rear side 18 of the cutting plate 4 at the cutting corner 12. In other words, the clearance face 28 extends along the entire cutting corner edge 22. In this way, the cutting plate 4 is reinforced along the entire cutting corner edge 22. In particular, in the case of a step 32, a foot 34 is usually also formed by the clearance face 28, on which the cutting corner 12 seems to stand.

[0057] The clearance surface 28 has a height H, which is measured between the cutting edge 10, i.e. the front side 16, and the contact surface 26, i.e. the separation line T. In possible embodiments, the height H varies along the cutting edge 10, for example because: the cutting edge 10 extends in a curved manner, the separation line T extends in a curved manner, or the separation line T and the cutting edge 10 extend in a straight manner but are not parallel to each other.

[0058] The cutting plate 4 shown here is an indexable insert plate, polygonal in shape, in particular quadrilateral, with a circumferential contour defining a front side 16 and four edges, all of which are formed in the present case as cutting edges 10. Of the four corners 12, 14, two corners that are opposite to one another are formed as cutting corners 12. Thus, there are also four lateral faces 24, one for each cutting edge 10.

[0059] The statements made here about the cutting edge 10 and the lateral surface 24 also apply analogously to one, several or all further cutting edges 10 and lateral surfaces 24 of the cutting plate 4. The lengths of the cutting edges 10 do not necessarily have to be the same, e.g. Figures 2 to 8 As shown, one cutting edge 10 is a short cutting edge, while the other cutting edge 10 is a long cutting edge. The various lateral surfaces 24, in particular the separation lines T, are not necessarily identical, nor are they necessarily mirror images of each other, but the lateral surfaces, in particular the separation lines, can also be designed independently of each other, such as Figures 2 to 8 In this way, many different embodiments are possible. However, in the embodiment shown herein, two separation lines T of adjacent lateral faces 24 meet at the cutting corner edge 22. Specifically, Figure 8 In the embodiment, the two separation lines T, ie in this case the two steps 32 together form a U-shape or a V-shape, the top of which faces in the direction of the rear side 18, so that in particular the cutting corner 12 is reinforced. Figure 6 and Figure 7 As shown, the separation line T (step 32) of one lateral face 24 is straight, while the separation line T (step) of the other lateral face 24 is S-shaped. Alternatively or additionally, both separation lines T are S-shaped or L-shaped, for example Figure 2 As shown, it is L-shaped.

Claims

1. A tool (2), a. comprising at least one cutting plate (4) for machining a workpiece, b. comprising a carrier (6) having a plate seat (8) for said cutting plate (4), c. wherein the cutting plate (4) comprises at least one cutting edge (10) for machining the workpiece, d. wherein the cutting plate (4) comprises at least one cutting corner (12), the cutting edge (10) terminating at the cutting corner, e. wherein the cutting plate (4) comprises at least one lateral surface (24) having a contact surface (26) and a clearance surface (28), f. wherein the contact surface (26) is adjacent to the plate seat (8), g. wherein the clearance surface (28) is defined by the cutting edge (10), h. wherein, at least at the cutting corner (12), the clearance surface (28) protrudes relative to the contact surface (26).

2. The tool (2) according to claim 1, The gap surface (28) and the contact surface (26) are separated by a separation line (T) having an S-shaped or L-shaped path.

3. The tool (2) according to claim 1 or 2, wherein the cutting plate (4) comprises a rear side (18) having a rear corner (20), wherein the cutting plate (4) comprises a cutting corner edge (22) extending from the cutting corner (12) to the rear corner (20), The clearance surface (28) and the contact surface (26) meet at a separation line (T), which runs along the lateral surface (24) in the direction of the cutting corner edge (22) and descends toward the rear side (18) of the cutting plate (4).

4. A tool (2) according to any one of claims 1 to 3, The gap surface (28) and the contact surface (26) are connected via a chamfered transition portion.

5. The tool (2) according to any one of claims 1 to 4, The gap surface (28) is offset from the contact surface (26) by a step (32).

6. The tool (2) according to any one of claims 1 to 5, The clearance surface (28) has a larger clearance angle (F1, F2) than the contact surface (26).

7. The tool (2) according to any one of claims 1 to 6, The clearance surface (28) extends to the rear side (18) of the cutting plate (4) at the cutting corner (12).

8. The tool (2) according to any one of claims 1 to 7, wherein the clearance surface (28) has a height (H) measured between the cutting edge (10) and the contact surface (16), The height (H) varies along the cutting edge (10).

9. The tool (2) according to any one of claims 1 to 8, wherein the cutting plate (4) comprises a further cutting edge (10) terminating at the cutting corner (12), wherein the cutting plate (4) comprises a further lateral surface (24) having a further contact surface (26) and a further clearance surface (28), wherein the further contact surface (26) abuts against the plate seat (8), wherein the further clearance surface (28) is defined by the further cutting edge (10), in, At least at the cutting corner (12), the further clearance surface (28) protrudes relative to the further contact surface (26).

10. The tool (2) according to any one of claims 1 to 9, The cutting plate (4) is an indexable insert plate.

11. The tool (2) according to any one of claims 1 to 10, The tool is configured as a milling tool.

12. A cutting plate (4) for a tool (2) according to any one of claims 1 to 11.

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