Abstract
A cutting part (1) for a tool head (2) for a lathe (3) for machining a workpiece (4), having a cutting edge (5) for removing material from the workpiece (4) and having a rake face (6) for guiding away the removed material or cuttings. The problem of providing a cutting part (1) which can be realized in a simple manner and with which lead-free materials can also be machined is solved in that a flat structure (7) is formed in the rake face (6) of the cutting part (1) adjoining the cutting edge (5) for breaking the cuttings. A lathe (3) for machining a workpiece (4), having a tool head (2) is provided with at least one such cutting part (1).
Claims
1-10. (canceled)
11. A cutting part for a tool head for a lathe for machining a workpiece, comprising: a cutting edge for removing material from the workpiece and with a face for guiding away the removed cuttings, and a flat structure adjoining the cutting edge for breaking the cuttings in the face of the cutting part.
12. The cutting part according to claim 11, wherein the flat structure has been produced by removing material in an area surrounding the flat structure.
13. The cutting part according to claim 11, wherein the flat structure has a herringbone pattern.
14. The cutting part according to claim 13, wherein the herringbone pattern of the flat structure has a middle stem and burrs that originate from the middle stem, and wherein the individual burrs are inclined toward the cutting edge and are arranged at an angle (a) of 90° or less relative to the middle stem.
15. The cutting part according to claim 14, wherein the burrs taper towards an end that faces away from the middle stem.
16. The cutting part according to claim 15, wherein, in a direction from an end of the burrs that faces the middle stem to an end of the burrs that faces away from the middle stem, the burrs first have a cross-sectional widening and then a cross-sectional constriction.
17. A lathe for machining a workpiece, comprising: a tool head with at least one cutting part that has a cutting edge for removing material from the workpiece and a face for guiding away the removed material cuttings, wherein a flat structure is provided adjoining the cutting edge for breaking the material cuttings in the face of the cutting part.
18. The lathe according to claim 17, wherein the flat structure has been produced by removing material in an area surrounding the flat structure.
19. The lathe according to claim 17, wherein the flat structure has a herringbone pattern.
20. The lathe according to claim 19, wherein the herringbone pattern of the flat structure has a middle stem and burrs that originate from the middle stem, and wherein the individual burrs are inclined toward the cutting edge and are arranged at an angle (a) of 90° or less relative to the middle stem.
21. The lathe according to claim 17, wherein the tool head is adapted to rotate around the workpiece when the lathe is in operation, and wherein the workpiece is mounted so that it does not perform any rotational movement.
22. The lathe according to claim 17, wherein the tool head has at least one additional cutting part.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
[0027] FIG. 1 shows a cutting part of a tool head of a lathe,
[0028] FIG. 2a shows a part of a cutting part in another perspective,
[0029] FIG. 2b shows a detailed cutaway of FIG. 2a, which shows the structure,
[0030] FIG. 3a shows a top view of the cutting part of FIG. 2a,
[0031] FIG. 3b shows a detailed cutaway of FIG. 3a, which shows the structure,
[0032] FIG. 4 shows a second variant of a structure,
[0033] FIG. 5 shows a detailed cutaway of FIG. 1 with a third variant of a structure,
[0034] FIG. 6 shows a partial cutaway of a cutting part with a workpiece, and
[0035] FIG. 7 shows a diagrammatic depiction of a lathe with two cutting parts and a workpiece.
DETAILED DESCRIPTION OF THE INVENTION
[0036] FIG. 1 shows a cutting part 1 for a tool head 2 for a lathe 3. The lathe 3 is designed for machining a workpiece 4. The cutting part 1 has a cutting edge 5 for removing material from the workpiece 4. Moreover, the cutting part 1 has a face 6, via which the cuttings that are produced during processing of the workpiece 4 are guided away. Adjoining the cutting edge 5 is a structure 7 that is used for breaking the cuttings in the face 6. The cuttings that are guided away over the face 6 are thus broken, i.e., crushed, on the structure 7. Thus, long flow cuttings are crushed to form discontinuous chips, which, for example, are only a few millimeters large/long instead of a few tens of centimeters. The structure 7 is flat in design and is thus created in such a way that the material in the surrounding area 8 of the structure 7 is removed. In the depicted embodiment, the area 8 has been laser-engraved around the structure. The top of the structure 7 is essentially flat in design.
[0037] In FIGS. 2a and 3a, in each case the upper part of the cutting part 1 is depicted in various perspectives. FIG. 2a shows an oblique top view of the cutting part 1, whereas FIG. 3a shows a top view of the cutting part 1. In FIGS. 2b and 3b, in each case detailed cutaways of FIGS. 2a and 3a are shown, wherein the cutaways in FIGS. 2a and 3a in each case are marked by a circle.
[0038] As the figures show, the cutting edge 5 has a longitudinal axis 9. The structure 7 is designed as a herringbone pattern 10 and has a middle stem 11 and burrs 12, which originate from the middle stem 11. The structure 7, 10 is especially clearly depicted in FIG. 3b, so that it is described in more detail based on FIG. 3b. The individual burrs 12 are inclined toward the cutting edge 5, wherein the angle α between the longitudinal axis 13 of the middle stem 11 and the longitudinal axis 14 of a burr 12 is 60°. Moreover, the longitudinal axis 13 of the middle stem 11 is perpendicular to the longitudinal axis 9 of the cutting edge 5; the angle β is thus 90°.
[0039] The individual burrs 12 point toward their end 15 that faces away from the middle stem 11. Overall, the burrs 12 that are depicted in FIGS. 2a to 3b have a bulbous shape, i.e., starting from their end 16 that faces the middle stem 11, they first have a cross-sectional widening and then a cross-sectional constriction. The middle stem 11 itself is narrow in design, i.e., it has a small width and, moreover, a smaller width than the burrs.
[0040] FIG. 4 shows an alternative configuration of a structure 7 in the form of a herringbone pattern 10. Unlike the configuration shown in FIG. 3b, the structure 7 that is shown in FIG. 4 has a middle stem 11, which is considerably wider in design than the burrs 12. Moreover, the burrs 12 are not bulbous in design, but rather are more slender, and have almost no cross-sectional widening. The angle α between the longitudinal axis 13 of the middle stem 11 and the longitudinal axis 14 of a burr 12 is also 60°. Both in the case of the structure of FIG. 3b and of FIG. 4, the burrs are arranged at the same distance apart.
[0041] FIG. 5 shows another alternative configuration of a structure 7 and at the same time shows a detailed cutaway of the cutting part 1 that is depicted in FIG. 1. The removed area 8 is especially clearly depicted around the structure 7. The structure 7 has burrs 12, which in each case are arranged in pairs around the middle stem 11. The burrs 12 are not all identical in design; in fact, the burrs 12 that are arranged closest to the cutting edge 5 have a shape that is different from the other burrs 12. The other burrs are designed in the shape of shark fins. The burrs thus point toward their end 15 that faces away from the middle stem 11, wherein the two sides of a burr 12 are curved in the same direction. The ends 16 of two adjacent burrs that face the middle stem 11 directly adjoin one another, so that two adjacent burrs 12 touch.
[0042] FIG. 6 shows a diagrammatic depiction of the cutting part 1 together with a workpiece 4, which is processed. The cutting part 1 and the workpiece 4 perform a rotational movement relative to one another, which is identified by the arrow. The cutting part 1 attacks the workpiece 4 with its cutting edge 5 and removes material from the workpiece. The removed material flows in the form of cuttings over the face 6 of the cutting part 1. Adjoining the cutting edge 5 is the structure 7 for breaking the cuttings in the face 6, so that the cuttings are broken directly.
[0043] In FIG. 7, a lathe 3 is depicted diagrammatically. The lathe 3 has a tool head 2. The workpiece 4 that is to be processed is introduced into the center of the tool head 2 or is guided through a recess in the tool head 2. The tool head 2 has two cutting parts 1, which are held with cutting part holders 17 and connected to the tool head 2. Structures 7 that adjoin the cutting edge 5 are made in the faces 6 of the cutting parts 1, which structures serve to break the cuttings that are produced. In the operating state, or in the work mode, the tool head 2 rotates around the workpiece 4, wherein the workpiece 4 itself does not perform any rotational movement. In this way, the workpieces 4 can be processed more precisely and also faster than when the workpiece 4 would rotate and the tool head 2 would not execute any rotational movement.
