Cutting tool and cutting insert therefor
View Patent ↗A cutting tool in which a cutting insert is retained by a retaining screw. The cutting insert comprises a rear surface and a lower surface, both of which are generally V-shaped.
1. A cutting insert comprising:
an upper surface, a lower surface and a peripheral surface therebetween, wherein:
the peripheral surface comprises:
opposing forward and rear surfaces, and side surfaces connecting the forward and rear surfaces; and
a through bore extending between the forward and rear surfaces;
a portion of the upper surface and a portion of the forward surface forms a forward edge; and
the lower and rear surfaces are generally V-shaped in both a first cross-section and a second cross-section, respectively.
2. The cutting insert according to claim 1 , wherein one of the lower and rear surfaces is convex and the other of the lower and rear surfaces is concave.
3. The cutting insert according to claim 1 , wherein the lower and rear surfaces are either both convex, or both concave.
4. The cutting insert according to claim 1 , wherein the first cross section is generally perpendicular to the side surfaces and upper surface, and the second cross section is generally perpendicular to the side surfaces and forward surface.
5. The cutting insert according to claim 1 , wherein the lower surface comprises a pair of insert lower faces which extend at an insert lower angle relative to each other; and the rear surface comprises a pair of insert rear faces which extend at an insert rear angle relative to each other.
6. The cutting insert according to claim 5 , wherein the insert lower and rear angles are external non-acute angles.
7. The cutting insert according to claim 5 , wherein the insert lower and rear angles are internal non-acute angles.
8. The cutting insert according to claim 5 , wherein:
one of the insert lower angle and the insert rear angle is an internal non-acute angle; and
the other of the insert lower angle and the insert rear angle is an external non-acute angle.
9. The cutting insert according to claim 5 , wherein:
the lower surface of the cutting insert is convex; and
the insert lower faces are spaced apart by a lower planar face.
10. The cutting insert according to claim 5 , wherein:
the rear surface of the cutting insert is convex; and
the insert rear faces are spaced apart by a rear planar face.
11. The cutting insert according to claim 10 , wherein:
the lower surface of the cutting insert is convex; and
the insert lower faces are spaced apart by a lower planar face.
12. The cutting insert according to claim 5 , wherein:
the insert lower angle and the insert rear angle are both between about 90° and about 150°.
13. The cutting insert according to claim 1 , wherein:
said portion of the upper surface comprises a rake surface and said portion of the forward surface comprises a relief surface.
14. The cutting insert according to claim 1 , wherein:
said portion of the upper surface comprises a relief surface and said portion of the forward surface comprises a rake surface.
15. A cutting insert comprising:
an upper surface;
a lower surface; and
a peripheral surface between the upper and lower surfaces, the peripheral surface comprising:
opposing forward and rear surfaces, and side surfaces connecting the forward and rear surfaces; and
a through bore extending between the forward and rear surfaces;
wherein:
an intersection of a portion of the upper surface and a portion of the forward surface forms a forward edge;
the lower surface comprises a pair of insert lower faces which form an insert lower angle between about 90° and about 150°; and
the rear surface comprises a pair of insert rear faces which form an insert rear angle between about 90° and about 150°.
16. The cutting insert according to claim 15 , wherein:
said portion of the upper surface comprises a rake surface and said portion of the forward surface comprises a relief surface.
17. The cutting insert according to claim 15 , wherein:
said portion of the upper surface comprises a relief surface and said portion of the forward surface comprises a rake surface.
18. The cutting insert according to claim 15 , wherein the insert lower angle and the insert rear angles are both external angles.
19. The cutting insert according to claim 15 , wherein the insert lower angle and the insert rear angles are both internal angles.
20. The cutting insert according to claim 15 , wherein:
one of the insert lower angle and the insert rear angle is an internal angle; and
the other of the insert lower angle and the insert rear angle is an external angle.
21. The cutting insert according to claim 15 , wherein:
the lower surface of the cutting insert is convex; and
the insert lower faces are spaced apart by a lower planar face.
22. The cutting insert according to claim 15 , wherein:
the rear surface of the cutting insert is convex; and
the insert rear faces are spaced apart by a rear planar face.
23. The cutting insert according to claim 22 , wherein:
the lower surface of the cutting insert is convex; and
the insert lower faces are spaced apart by a lower planar face.
24. A cutting tool comprising:
an insert holder comprising an insert pocket, the insert pocket comprising a rear abutment surface and a lower abutment surface, with a threaded bore formed in the rear abutment surface, wherein:
the lower and rear abutment surfaces of the insert pocket are generally V-shaped in both a first cross-section and a second cross-section, respectively
the rear abutment surface of the insert pocket is adapted to at least partially abut the rear surface of the cutting insert of claim 1 ; and
the lower abutment surface of the insert pocket is adapted to at least partially abut the lower surface of the cutting insert of claim 1 .
25. The cutting tool according to claim 24 , wherein the insert holder is part of a rotary slot metal cutting tool.
26. The cutting tool according to claim 24 , wherein the insert holder is part of a rectangular blade.
27. The cutting tool according to claim 24 , wherein the rear abutment surface is divided by a rear recess into a first abutment surface along an upper portion thereof distal the lower abutment surface and a second abutment surface along a lower portion thereof proximal the lower abutment surface.
28. The cutting tool according to claim 24 , wherein one of the lower and rear abutment surfaces is convex and the other of the lower and rear surfaces is concave.
29. The cutting tool according to claim 24 , wherein the lower and rear abutment surfaces are either both convex, or both concave.