Method for disintegrating an elastomer and disintegrator
A method and apparatus for disintegrating an elastomer is provided. The elastomer is moved across a base relative to a cutting tool and toward the cutting tool. The cutting tool has a cutting wedge, which has a cutting edge and a rake face adjacent to the cutting edge. After the cutting wedge comes into contact with the elastomer, the elastomer is first at least partially compressed only by the rake face between the rake face and the base before the cutting edge cuts through the elastomer. An elastic evasive movement of the elastomer is avoided because of the initial planar compression of the elastomer by the rake face. Thus, it is possible to cut off significantly thinner pieces from the elastomer.
1. A method for disintegrating an elastomer, comprising:
moving the elastomer in relation to a cutting tool over a base toward the cutting tool, wherein the cutting tool comprises a cutting wedge with a cutting edge and a rake face adjoining the cutting edge, and
once the cutting wedge comes into contact with the elastomer, initially at least partially compressing the elastomer only by the rake face between the rake face and the base, before the cutting edge cuts through the elastomer,
wherein in a state in which the elastomer has elastically flipped up from the base, the elastomer is captured by the rake face, subsequently pressed against the base, and in a position in which the elastomer no longer elastically evades the cutting edge, cut by rolling the cutting edge on the at least partially compressed elastomer and moving the cutting wedge through the elastomer in a wedge-like manner.
2. The method as claimed in claim 1 , wherein the movement of the elastomer and the movement of the cutting wedge are adapted to one another in such a way that slices that are cut off from the elastomer have a thickness t of t≦1.5 mm.
3. The method according to claim 2 , wherein said slices that are cut off from the elastomer have a thickness t of t≦1.2 mm.
4. The method according to claim 2 , wherein said slices that are cut off from the elastomer have a thickness t of t≦1.0 mm.
5. The method according to claim 2 , wherein said slices that are cut off from the elastomer have a thickness t of t≦0.8 mm.
6. The method as claimed in claim 1 ,
wherein the elastomer has a cut end facing the cutting tool,
further comprising:
effecting an oscillation between a bottom dead center that is associated with the base and a top dead center that is remote from the base, to the cut end of the elastomer by the cutting of the cutting tool, and
the cutting wedge substantially contacting the elastomer whenever the cut end is substantially at the top dead center, the contact of the cutting wedge with the elastomer taking place with respect to the top dead center of the cut end with a phase shift φ of φ±15°.
7. The method according to claim 6 , wherein said phase shift meets the requirement of φ≦±8°.
8. The method according to claim 6 , wherein said phase shift meets the requirement of φ≦±2°.
9. The method as claimed in claim 1 , wherein an angle α between the rake face and the base at a point when the cutting wedge and the elastomer begin contacting each other is 15°≦α≦40°.
10. The method according to claim 9 , wherein said angle α is 20°≦α≦35°.
11. The method according to claim 10 , wherein said angle α is 25°≦α≦30°.
12. The method as claimed in claim 1 , wherein the cutting of the elastomer with the aid of the cutting edge commences at a pressure p below a pressure p k for the beginning of strain crystallization of the elastomer, where 0.20≦p/p k ≦0.95.
13. The method as claimed in claim 1 , wherein the rake face of the cutting wedge comes into contact with the elastomer on a peripheral surface of the elastomer.
14. The method as claimed in claim 1 , wherein cutting edges of two successive cutting wedges are at a distance D, wherein with respect to the effective diameter d of the elastomer, the distance D is 1.0≦D/d≦8.0.
15. The method according to claim 14 , wherein the distance D, with respect to the effective diameter d of the elastomer, is 1.5≦D/d≦6.0.
16. The method according to claim 14 , wherein the distance D, with respect to the effective diameter d of the elastomer, is 2.0≦D/d≦4.0.
17. The method according to claim 14 , wherein the distance D, with respect to the effective diameter d of the elastomer, is 1.5≦D/d=3.0±0.5.
18. The method as claimed in claim 1 , wherein the cutting edge of the cutting wedge has a circumferential speed v of 1.0 m/s≦v≦50.0 m/s.
19. The method according to claim 18 , wherein said circumferential speed v is 10.0 m/s≦v≦35.0 m/s.
20. The method according to claim 18 , wherein said circumferential speed v is 20.0 m/s≦v≦30.0 m/s.
21. The method according to claim 18 , wherein said circumferential speed v is 25.0 m/s≦v≦27.0 m/s.
22. The method as claimed in claim 1 , wherein the cutting tool rotates about a center point, the center point being offset in relation to a center line of the elastomer substantially perpendicularly to the direction of movement of the elastomer by a distance s, wherein the distance s with respect to the effective diameter d of the elastomer is 0.4≦s/d≦1.0.
23. The method according to claim 22 , wherein said distance s with respect to the effective diameter d of the elastomer is 0.45≦s/d≦0.6.
24. The method according to claim 22 , wherein said distance s with respect to the effective diameter d of the elastomer is 0.5≦s/d≦0.55.
25. The method as claimed in claim 1 , wherein the rake face is inclined in the circumferential direction by an angle β in relation to a radius of the cutting tool running through the cutting edge, where 20°≦β≦40°.
26. The method according to claim 25 , wherein said angle β is 25°≦β≦35°.
27. The method according to claim 25 , wherein said angle β is 30°±2.5°.
28. The method according to claim 1 wherein the elastomer is at least one elastomer strand.
29. The method as claimed in claim 28 , wherein the strand is formed by twisting an elastomer film before the cutting.
30. The method according to claim 29 , wherein said elastomer film is chloroprene rubber.
31. The method according to claim 1 , wherein the cutting of the elastomer with the aid of the cutting edge commences at a pressure p below a pressure p k for the beginning of strain crystallization of the elastomer, wherein 0.50≦p/p k ≦0.90.
32. The method according to claim 1 , wherein the cutting of the elastomer with the aid of the cutting edge commences at a pressure p below a pressure p k for the beginning of strain crystallization of the elastomer, wherein 0.6≦p/p k ≦0.85.
33. The method according to claim 1 , wherein the cutting of the elastomer with the aid of the cutting edge commences at a pressure p below a pressure p k for the beginning of strain crystallization of the elastomer, wherein 0.7≦p/p k ≦0.80.
34. A disintegrator for disintegrating an elastomer, comprising:
a cutting tool for cutting off slices from the elastomer, the cutting tool comprising a cutting wedge with a cutting edge and a rake face adjoining the cutting edge, and
an advancing device for moving the elastomer over a base toward the cutting tool,
wherein the advancing device and the cutting tool are configured to permit the advancement of the advancing device and the geometry of the cutting tool to match one another in such a way that, once the cutting wedge comes into contact with the elastomer, the elastomer is initially at least partially compressed only by the rake face between the rake face and the base, before the cutting edge cuts through the elastomer,
wherein in a state in which the elastomer has elastically flipped up from the base, the elastomer is captured by the rake face, subsequently pressed against the base, and in a position in which the elastomer no longer elastically evades the cutting edge, cut by rolling the cutting edge on the at least partially compressed elastomer and moving the cutting wedge through the elastomer in a wedge-like manner.