Cutting bodies and drills or chisels containing cutting bodies

Abstract

This invention relates to a cutting body having a first cutting edge and a second cutting edge. The first cutting edge has at least two slope change points, and the second cutting edge has at least two corresponding slope change points. The cutting body has a first plane intersecting the first cutting edge and a second plane intersecting the second cutting edge. The line of intersection of the first and second planes is perpendicular to the central axis of the cutting body. The angles of the first and second planes relative to the central axis are equal. The first and second slope change points are arranged on different sides of the first plane, and corresponding first and second slope change points are arranged on different sides of the second plane. A first distance between the first slope change point and the first plane substantially corresponds to a first corresponding distance between the first corresponding slope change point and the second plane. It is proposed that the midpoint between the first slope change point and the first corresponding slope change point is arranged spaced apart from the central axis.

Description

Technical Field

[0001] This invention relates to a cutting body for a drill or chisel and a corresponding drill or chisel. Background Technology

[0002] A cutting body for use in drills or chisels is known, the cutting body comprising a first cutting edge and a second cutting edge. Summary of the Invention

[0003] This invention relates to a cutting body for drills or chisels, comprising a first cutting edge and a second cutting edge, each having a start point and an end point. The first cutting edge has at least two slope change points, and the second cutting edge has at least two corresponding slope change points. The cutting body has a first plane intersecting the first cutting edge and a second plane intersecting the second cutting edge. The line of intersection of the first and second planes extends perpendicular to the central axis of the cutting body. The angles of the first and second planes relative to the central axis are equal. The first and second slope change points are arranged on different sides of the first plane, and a first corresponding slope change point and a second corresponding slope change point are arranged on different sides of the second plane. A first distance between the first slope change point and the first plane substantially corresponds to a first corresponding distance between the first corresponding slope change point and the second plane. It is proposed that the midpoint between the first slope change point and the first corresponding slope change point is spaced apart from the central axis. Advantageously, such a cutting body enables particularly high material removal efficiency.

[0004] The drilling tool is specifically constructed as a rock drill bit, which is configured for hammer drilling. Alternatively, it is also conceivable that the drilling tool is constructed as a metal drill bit or a ceramic drill bit. The chisel tool can be constructed, for example, as a ceramic chisel, hollow chisel, channel chisel, pointed chisel, flat chisel, winged chisel, joint chisel, folding chisel, claw chisel, shovel chisel or pitch chisel, and is particularly configured for hammer chisels or impact hammers.

[0005] The drill or chisel has an insertion end at its end opposite the cutting body, configured for coupling with a hand-held machine tool (e.g., a hammer drill or impact hammer). Preferably, the drill or chisel is configured in the region of the insertion end such that it can be coupled to the tool housing of the hand-held machine tool. For example, the drill or chisel may have a shape-locking element configured as a special groove in the region of the insertion end, forming an SDS-plus interface or an SDS-max interface. To machine the workpiece, the drill is brought into a state of rotation and linear oscillation or impact by means of a hammer drill. During machining, the drill or chisel penetrates into the workpiece along the feed direction. The feed direction of the drill or chisel is coaxial with the longitudinal axis or rotation axis and extends from the insertion end toward the cutting body. The longitudinal axis of the drill or chisel corresponds particularly to the working axis or rotation axis of the drill or chisel.

[0006] The cutting body can be constructed as a single piece with the base of the drill or chisel. Alternatively, it is also conceivable that the cutting body be constructed as a single piece with the base of the drill or chisel. The cutting body has a tip, which, in use, is used to place or mount the drill or chisel onto the workpiece to be processed. For example, this tip can be constructed as a chisel blade. The cutting body is particularly made of hard metal. Preferably, the hardness of the cutting body is higher than the hardness of the base material.

[0007] The first and second cutting edges are preferably configured as the main cutting edges. In particular, the cutting edges respectively form the transition between the cutting face (rake face) and the flank face. Specifically, the two cutting edges are arranged on different sides of the cutting body, wherein the sides are separated by a plane along the central axis of the cutting body. The cutting edges extend substantially linearly, at least in sections. The wedge angles of the first and / or second cutting edges are particularly in the range of 60° to 120°, preferably in the range of 80° to 100°. Preferably, the wedge angle is substantially 90°. Preferably, the wedge angles of the first and second cutting edges are substantially at least in sections the same, preferably identical. The starting point of the cutting edge is particularly located in the region of the tip. Preferably, the starting point at least partially forms the tip of the cutting body. The ending points of the first and / or second cutting edges are preferably arranged on the radial outer edge of the cutting body.

[0008] In the context of this application, the "central axis" of the cutting body should be understood in particular as the geometric central axis in a top view of the cutting body. Preferably, the central axis is also a rotation axis about which the drill or chisel can rotate during operation. Preferably, the intersection line is arranged such that it intersects the central axis of the cutting body.

[0009] Preferably, the first plane is arranged such that it intersects only the first cutting edge, and the second plane is arranged such that it intersects only the second cutting edge.

[0010] The slope change points are arranged at the transition between two substantially straight sections of the cutting edge. Specifically, the slope change points of the first cutting edge and their corresponding slope change points of the second cutting edge are arranged at substantially the same height. In this context, "at the same height" should be understood as a plane perpendicular to the central axis of the cut body intersecting not only the slope change points but also the corresponding slope change points, wherein the slope change points and their corresponding slope change points can also have a small distance from this plane, preferably less than 10% of the extension dimension of the cutting edge along the central axis.

[0011] The distance between the slope change point and the first plane, and the corresponding distance between the slope change point and the second plane, specifically refers to the shortest distance. However, alternatively, it can be envisioned that the distance and the corresponding distance refer to the distance along the perpendicular line along the central axis of the cut body. In the context of this application, the corresponding distance and the corresponding distance should be understood in particular as two distances that differ from each other by at most 15%, preferably at most 8%, and preferably substantially equal.

[0012] Furthermore, it is proposed that the second distance between the second slope change point and the first plane substantially corresponds to the second corresponding distance between the second slope change point and the second plane. Advantageously, this can further improve the material removal capacity.

[0013] Furthermore, it is proposed that only the first slope change point of the first cutting edge is constructed as the cutting region of the first cutting edge, or only the second slope change point of the first cutting edge is constructed as the cutting region of the first cutting edge. Advantageously, this can significantly improve the material removal capacity of the cutting body locally. In the context of this application, the cutting region of the cutting edge should be understood in particular as the region that at least partially forms the envelope curve of the cutting body when it rotates about the central axis, and therefore this region is set for material removal during use.

[0014] Furthermore, it is proposed that either the slope change point of the first cutting edge is constructed as the cutting region, or the corresponding slope change point of the second cutting edge is constructed as the cutting region. Advantageously, this can significantly improve the material removal capacity on one side.

[0015] Furthermore, it is proposed that each slope change point and its corresponding slope change point be arranged rotationally symmetrically about the central axis. This advantageous extension scheme further improves material removal capacity and the stability of the cut body.

[0016] In addition, the present invention relates to a drill or chisel having a cutting body as described above.

[0017] Furthermore, it is proposed that the cutting body be constructed as a single piece with the drill bit or chisel, or be connected to the drill bit or chisel material in a locking manner.

[0018] Furthermore, the present invention particularly relates to a cutting body for a drill or chisel, the drill or chisel comprising a base, the cutting body having a first cutting edge and a second cutting edge, wherein these cutting edges each have a start point and an end point, wherein the first cutting edge has at least one slope change point, and the second cutting edge has at least one corresponding slope change point, wherein at the first slope change point, the slope of the first cutting edge changes by X. It is proposed that at the corresponding slope change point, the slope of the second cutting edge changes by -(X + / - 10°). Advantageously, this enables the realization of opposing cutting edge profiles, through which the material removal capacity of the cutting body is locally improved.

[0019] The term "X" here refers to a variable in degrees. X is particularly in the range of 0° to 120°, preferably in the range of 0° to 60°, and even more preferably in the range of 0° to 30°.

[0020] Furthermore, it is proposed that the starting point and / or ending point of each cutting edge are arranged at substantially the same height. It is also proposed that the cutting edge has at least two, preferably at least three, linearly extending segments, wherein the transition of these segments takes place at the slope change point and in the region of the corresponding slope change point. Furthermore, it is proposed that the first cutting edge has at least one cutting region, and the second cutting edge has at least one cutting region, wherein the cutting region of the first cutting edge does not overlap with the cutting region of the second cutting edge in the axial direction. Attached Figure Description

[0021] Further advantages are illustrated by the accompanying drawings. The drawings, description, and claims contain a large number of combined features. Those skilled in the art will also readily consider these features individually and combine them into other meaningful combinations. The reference numerals for substantially corresponding features in different embodiments of the invention are provided with the same numerals and letters indicating the embodiments are provided.

[0022] The attached diagram shows:

[0023] Figure 1a A side view of a drill bit having a cutting body according to the invention;

[0024] Figure 1b according to Figure 1a A top view of the cut body;

[0025] Figure 1c Perspective view of the cut object;

[0026] Figure 1dSide view of the cut object;

[0027] Figure 2a A perspective view of an alternative implementation of the cut body;

[0028] Figure 2b according to Figure 2a A side view of the cut body. Detailed Implementation

[0029] exist Figures 1a to 1d The first embodiment of the cutting body 10 according to the present invention is shown in the figure.

[0030] exist Figure 1a The diagram shows a drill bit 100 with a cutting body 10. The drill bit 100 is exemplarily constructed as a rock drill bit. The drill bit 100 extends along a longitudinal axis 102, which in this example is also a rotation axis about which the drill bit 100 can rotate for operation when connected to a handheld machine tool, such as a hammer drill (not shown). Along the longitudinal axis 102, the drill bit 100 has a working area 104 at its front end, in which the cutting body 10 is arranged. The cutting body 10 is constructed as a separate component that is connected to the base 101 of the drill bit 100. Here, material locking is achieved, for example, by brazing. The base 101 is made of tool steel, for example. The cutting body 10 is particularly constructed as a hard metal plate and is made of hard metal. Therefore, advantageously, the hardness of the cutting body 10 is greater than that of the base 101, thereby reducing wear in the working area 104. In the working area 104, the material to be processed is broken up or removed during operation of the drill bit 100, or handheld power tool. At the rear end of the drill bit 100, the drill bit 100 has an insertion end 106. The insertion end 106 is exemplarily constructed as a round rod and has a cylindrical shape. The drill bit 100 can be connected to the tool housing of the handheld power tool via the insertion end 106. Between the working area 104 and the insertion end 106, the drill bit 100 has a transport area 108 for removing drill cuttings, or drilling cuttings. In the transport area 108, the drill bit 100, or the base 101, has a transport auger 110 that extends helically about a longitudinal axis 102 on the outer surface of the base 101.

[0031] exist Figure 1b The diagram shows a top view of the cutting body 10 along its central axis 12. The central axis 12 extends, exemplarily, through the geometric center 14 of the cutting body 10 in the top view. The cutting body 10 can be connected to the drill string 100 such that the central axis 12 of the cutting body 10 extends coaxially with the longitudinal axis 102 of the drill string 100. However, it is also conceivable that the cutting body 10 and the base 101 of the drill string 100 are interconnected such that the central axis 12 is arranged parallel to the longitudinal axis 102.

[0032] exist Figure 1c A perspective view of a cutting body 10 is shown. The cutting body 10 has a tip 16. The tip 16 is exemplarily configured as a transverse blade 18. Additionally, the cutting body 10 has a first cutting edge 20 and a second cutting edge 22. The first cutting edge 20 and the second cutting edge 22 are interconnected via the transverse blade 18. The cutting edges 20 and 22 each have a starting point 24 and an ending point 26. The starting point 24 is exemplarily arranged in the region of the tip 16 of the cutting body 10. In particular, the starting point 24 is arranged in the transition region where the cutting edges 20 and 22 transition to the transverse blade 18. The ending point 26 of the cutting edges 20 and 22 is exemplarily arranged in the radially outermost region of the cutting body 10.

[0033] exist Figure 1d The diagram shows a side view of the cut body 10. The first cutting edge 20 and the second cutting edge 22 each have a unique cutting region 28. Here, the cutting region 28 is the region of the cutting edges 20 and 22, which at least partially forms the envelope curve 30 of the cut body 10 as it rotates about the central axis 12. The cutting region 28 of the first cutting edge 20 begins at a starting point 24 in the region of the tip 16 and ends approximately halfway up to the end point 26. At the height at which the first cutting edge 20 has the cutting region 28, the second cutting edge 22 essentially does not have a cutting region 28. At the height at which the cutting region 28 of the first cutting edge 20 ends, the cutting region 28 of the second cutting edge 22 begins. The cutting region 28 of the second cutting edge 22 exemplarily ends at the end point 26 of the second cutting edge 22. Therefore, the envelope curve 30 of the cut body 10 is essentially formed by two non-overlapping cutting regions 28.

[0034] Because the two cutting regions 28, arranged on different cutting edges 20 and 22, do not overlap or are arranged at different heights, when machining the workpiece, such as during drilling or chiseling, the force does not act on the entire first and second cutting edges 20 and 22, but only on a portion of the first cutting edge 20 and a portion of the second cutting edge 22. Therefore, the force is advantageously and significantly increased in these portions, or in the cutting regions 28, thereby improving material removal capacity.

[0035] To achieve the geometry of the cut edges 20 and 22, the cut edges 20 and 22 each have different segments that extend substantially in a straight line. For example, the first cut edge 20 and the second cut edge 22 each have three straight segments, wherein at least one adjacent segment, preferably two adjacent segments, have different slopes. In this context, the slope should be understood in particular as the angle between the extension of the corresponding segment in the side view and the central axis 12 of the cut body 10.

[0036] At the transition between the two sections, the cut body 10 has a slope change point 32. Therefore, the first cut edge 20 has two slope change points 32. The second cut edge 22 also has three straight sections with different slopes and two corresponding slope change points 34. The slope change points 32 of the first cut edge 20 and the corresponding slope change points 34 of the second cut edge 22 are basically arranged at the same height.

[0037] At the first slope change point 36, the slope of the first cutting edge 20 changes from 70° to 40°, where X is approximately -30°. Correspondingly, at the first corresponding slope change point 37 of the second cutting edge 22, the slope changes from 35° to 72°, where X is approximately 37°.

[0038] At the second slope change point 39, the slope of the first cutting edge 20 changes from 40° to 70°, where X is approximately 30°. Correspondingly, at the second corresponding slope change point 40 of the second cutting edge 22, the slope changes from -X+ / -10° from 72° to 32°, thus changing by approximately -40°.

[0039] The first slope change point 36 of the first cutting edge 20 and the first corresponding slope change point 37 of the second cutting edge 22 are arranged at the first height 38. The second slope change point 39 of the first cutting edge 20 and the second corresponding slope change point 40 of the second cutting edge 22 are arranged at the second height 41.

[0040] To achieve the highest possible material removal capacity, the slope change points 32 and corresponding slope change points 34 are arranged such that the first plane 46 intersecting the first cutting edge 20 and the second plane 48 intersecting the second cutting edge 22 intersect. The intersection line 50 of the first and second planes 46 and 48 is perpendicular to the central axis 12 of the cutting body 10. The first plane 46 and the second plane 48 have the same angle with respect to the central axis 12, and the slope change points 32 are located on different sides of the first plane 46, while the corresponding slope change points 34 are arranged on different sides of the second plane 48.

[0041] In particular, the first distance 52 between the first slope change point 36 and the first plane 46 substantially corresponds to the first corresponding distance 53 between the first corresponding slope change point 37 and the second plane 48. Furthermore, the second distance 55 between the second slope change point 39 and the first plane 46 substantially corresponds to the second corresponding distance 56 between the second corresponding slope change point 40 and the second plane 48. For example... Figure 1dAs shown, the spacing mentioned can be the distance between the point of slope change and the plane perpendicular to the central axis 12. Alternatively, it can be envisioned that the spacing is the shortest distance between the point of slope change and the plane, i.e., orthogonal to the plane.

[0042] Furthermore, the midpoint 58 between the slope change point 32 and the corresponding slope change point 34 is spaced apart from the central axis 12. Preferably, as exemplarily shown, the different midpoints 58 are each spaced apart from the central axis 12 by the same distance 60.

[0043] exist Figure 2a and Figure 2b An alternative embodiment of the cutting body 10 is shown. The cutting body 10a has a first cutting edge 20a and a second cutting edge 22a, the starting point 24a of the first cutting edge and the second cutting edge is the corner point of the cross blade 18a, which in turn connects the two cutting edges 20a and 22a.

[0044] Cut edges 20a and 22a each have three straight segments, with slope change points 32a and 34a arranged at the transitions of these segments. The slope change point 32a of the first cut edge 20a and the corresponding slope change point 34a of the second cut edge 22a are arranged at essentially the same height. Similar to the previous embodiment, the slope change points 32a and 34a are arranged on different sides of planes 46a and 48a, and the intersection line 50a of these planes intersects perpendicularly to the central axis 12.

[0045] The slope change points 32a and 34a are arranged such that the first distance 52a between the first slope change point 36a and the first plane 46a substantially corresponds to the first corresponding distance 53a between the first corresponding slope change point 37a and the second plane 48a. Here, the distances 52a and 53a are measured perpendicular to the plane. Furthermore, the second distance 55a between the second slope change point 39a and the first plane 46a substantially corresponds to the second corresponding distance 56a between the second corresponding slope change point 40a and the second plane 48a.

[0046] Furthermore, the midpoint 58a between the slope change point 32a and the corresponding slope change point 34a is spaced apart from the central axis 12a. In this embodiment, the spacing between the centers 58a (and the central axis) differs from each other. In particular, the spacing of the first midpoint 62a belonging to the first slope change points 36a and 37a is smaller than the spacing of the second midpoint 64a belonging to the second slope change points 39a and 40a. In particular, the spacing of the second midpoint 64a is essentially twice the spacing of the first midpoint 62a. Preferably, the spacing of the second midpoint 64a is not less than the spacing of the first midpoint 62a, and not more than three times the spacing of the first midpoint 62a.

Claims

1. A cutting body for a drill or chisel, comprising a first cutting edge (20) and a second cutting edge (22), wherein, The first and second cutting edges each have a starting point (24) and an ending point (26), wherein the first cutting edge (20) has at least two slope change points (32), and the second cutting edge (22) has at least two corresponding slope change points (34). The cutting body has a first plane (46) intersecting the first cutting edge (20) and a second plane (48) intersecting the second cutting edge (22), wherein the line (50) of intersection of the first plane (46) and the second plane (48) extends perpendicularly to the central axis (12) of the cutting body (10), wherein the first plane (46) and the second plane (48) have relative to the central axis (12) a certain degree of symmetry. The first slope change point (36) and the second slope change point (39) are arranged on different sides of the first plane (46), and the first corresponding slope change point (37) and the second corresponding slope change point (40) are arranged on different sides of the second plane (48), wherein the first slope change point (36) and the first plane (46) have a first distance (52) that substantially corresponds to the first corresponding distance (53) between the first corresponding slope change point (37) and the second plane (48), characterized in that the midpoint (58) between the first slope change point (36) and the first corresponding slope change point (37) is arranged spaced apart from the central axis (12).

2. The cutting body according to claim 1, characterized in that, The second slope change point (39) and the second distance (55) between the first plane (46) are substantially corresponding to the second corresponding distance (56) between the second slope change point (40) and the second plane (48).

3. The cutting body according to claim 1 or 2, characterized in that, The first slope change point (36) of the first cutting edge (20) or the second slope change point (39) of the first cutting edge (20) is constructed as the cutting region (28) of the first cutting edge (20).

4. The cutting body according to claim 1 or 2, characterized in that, The slope change point (32) of the first cutting edge (20) or the corresponding slope change point (34) of the second cutting edge (22) is constructed as the cutting region (28).

5. The cutting body according to claim 1 or 2, characterized in that, The intersection line (50) intersects the central axis (12) of the cutting body (10).

6. The cutting body according to claim 1 or 2, characterized in that, Each slope change point (32) and the corresponding slope change point (34) are arranged rotationally symmetrically about the central axis (12).

7. The cutting body according to claim 1 or 2, characterized in that, The slope change points (32) and the corresponding slope change points (34) are basically arranged at the same height.

8. A drill or chisel having a cutting body (10) according to any one of the preceding claims.

9. The drill bit or chisel according to claim 8, wherein, The cutting body (10) is constructed as a single piece with the drill bit (100) or is materially locked to the drill bit (100).

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