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1. (WO1998051436) APPARATUS FOR BREAKING CHIPS
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CLAIMS

1. Apparatus for breaking chips in a metal cutting process in which a chip is parted from a workpiece by a tool at the shear plane of chip formation, comprising lever forming means for forming a chip into a lever for exerting a force to increase shear strain at the shear plane until fracture occurs at the shear plane and wherein the lever forming means comprises an arcuate surface arranged to be inclined to a cutting edge of the tool.

2. Apparatus as claimed in claim 1 wherein the arcuate surface is a two-dimensionally arcuate surface.

3. Apparatus as claimed in claim 2 wherein the surface is a portion of a cylinder.

4. Apparatus as claimed in claim 1 wherein the arcuate surface is a three dimensionally arcuate surface.

5. Apparatus as claimed in claim 4 wherein the arcuate surface is a portion of a sphere.

6. Apparatus as claimed in any one of the preceding claims wherein the lever means comprises a plurality of said arcuate surfaces.

7. Apparatus as claimed in claim 6 wherein the arcuate surfaces are connected by chip side flow restricting surfaces.

8. Apparatus as claimed in any one of the preceding claims wherein the lever forming means is arranged to form a pivoting surface for bending a said chip towards a reaction surface and forming a fulcrum point in contact with the said chip, a guiding surface for guiding the said chip to flow towards said reaction surface and a side flow restricting surface for restricting sideways flow of the said chip.

9. Apparatus as claimed in any one of the preceding claims comprising a plurality of said lever means.

10. In combination, apparatus as claimed in any one of the preceding claims and a tool insert, the tool insert having a cutting edge and providing a reaction surface for the lever means.

1 1. In combination, apparatus as claimed in any one of claims 1 to 9 and a workpiece, the workpiece providing a reaction surface for the lever means.

12. Apparatus as claimed in any one of claims 1 to 9 constructed together with a tool insert.

13. A tool insert having a plurality of cutting edges each having associated chip breaking apparatus as claimed in claim 12.

14. Apparatus for breaking chips in a metal cutting process in which a chip is parted from a workpiece by a tool at the shear plane of chip formation, comprising lever forming means for forming a chip into a lever for exerting a force to increase shear strain at the shear plane until fracture occurs at the shear plane and wherein the lever forming means comprises an arcuate surface arranged to form a pivoting surface for bending a said chip towards a reaction surface and forming a fulcrum point in contact with the said chip, a guiding surface for guiding the said chip to flow towards said reaction surface and a side flow restricting surface for restricting sideways flow of the said chip.

15. Apparatus for breaking chips in a metal cutting process in which a chip is parted from a workpiece by a tool at the shear plane of chip formation, comprising a plurality of lever forming means for forming a chip into a lever for exerting a force to increase shear strain at the shear plane until fracture occurs at the shear plane.