Compression milling cutter with indexable cutting inserts

Patent metadata

Field	Value
Publication number	US-10525539-B2
Application number	US-201815864600-A
Country	US
Kind code	B2
Filing date	Jan 8, 2018
Priority date	Jan 8, 2018
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A compression milling cutter includes a shank and a front cutting portion that terminates at a leading end of the milling cutter. The front cutting portion has a first circumferential row of one or more insert receiving pockets proximate a leading end of the milling cutter, and a second circumferential row of one or more insert receiving pockets, each insert receiving pocket configured to receive a respective indexable cutting insert. The cutting insert mounted in the first circumferential row has a positive axial rake angle, A, and the indexable cutting insert mounted in an insert pocket of the second circumferential row has a negative axial rake angle, B. Because of the different axial rake angles, chips generated during a machining operation flow in opposite directions, thereby creating a compression zone disposed between the first and second circumferential rows. This compression zone replicates the cutting action of a solid end mill, particularly when machining fiber reinforced plastic materials.

First claim

What is claimed is:

1. A compression milling cutter for machining a laminated material, said compression milling cutter comprising:
a front cutting portion having a first circumferential row of one or more insert receiving pockets proximate a leading end of the milling cutter, and a second circumferential row of one or more insert receiving pockets, each insert receiving pocket configured to receive a respective indexable cutting insert;
wherein the indexable cutting insert mounted in an insert pocket of the first circumferential row has a positive axial rake angle, A, with respect to a rotational axis such that a chip generated during an operation of machining a laminated material is guided in a first direction,
wherein the indexable cutting insert mounted in an insert pocket of the second circumferential row has a negative axial rake angle, B, with respect to the rotation axis such that a chip generated during the operation of machining a laminated material is guided in a second direction opposite the first direction, thereby creating a compression zone disposed between the first and second circumferential rows, and
wherein the indexable cutting insert mounted in an insert pocket of the first circumferential row and the indexable cutting insert mounted in an insert pocket of the second circumferential row are disposed along a helix with respect to one another.

2. The compression milling cutter of claim 1 , wherein the positive axial rake angle, A, is greater than 0 degrees and less than 35 degrees.

3. The compression milling cutter of claim 1 , wherein the negative axial rake angle, B, is less than 0 degrees and greater than −35 degrees.

4. The compression milling cutter of claim 1 , wherein the first circumferential row includes at least two cutting inserts.

5. The compression milling cutter of claim 4 , wherein a first cutting insert mounted in the first circumferential row has a first positive axial rake angle, A, and wherein a second cutting insert of the first circumferential row has a second positive axial rake angle, A.

6. The compression milling cutter of claim 5 , wherein the first positive axial rake angle, A, is identical to the second positive axial rake angle, A.

7. The compression milling cutter of claim 5 , wherein the first positive axial rake angle, A, is different than the second positive axial rake angle, A.

8. The compression milling cutter of claim 1 , wherein the second circumferential row includes at least two cutting inserts.

9. The compression milling cutter of claim 8 , wherein a first cutting insert mounted in the second circumferential row has a first negative axial rake angle, B, and wherein a second cutting insert of the second circumferential row has a second negative axial rake angle, B.

10. The compression milling cutter of claim 9 , wherein the first negative axial rake angle, B, is identical to the second negative axial rake angle, B.

11. The compression milling cutter of claim 9 , wherein the first negative axial rake angle, B, is different than the negative axial rake angle, B.

12. The compression milling cutter of claim 1 , further comprising a third circumferential row of one or more insert receiving pockets, each insert receiving pocket configured to receive a respective indexable cutting insert.

13. The compression milling cutter of claim 12 , wherein a first cutting insert mounted in the second circumferential row has a first negative axial rake angle, B, and wherein a second cutting insert is mounted in the third circumferential row at a second negative axial rake angle, B.

14. The compression milling cutter of claim 13 , wherein the first negative axial rake angle, B, is identical to the second negative axial rake angle, B.

15. The compression milling cutter of claim 13 , wherein the first negative axial rake angle, B, is different than the second negative axial rake angle, B.

16. The compression milling cutter of claim 1 , further comprising a shank and a transition surface between the shank and the front cutting portion.

17. The compression milling cutter of claim 1 , wherein the indexable cutting insert comprises:
a top surface having a substantially planar central portion, a substantially planar bottom surface, and a plurality of side surfaces;
a long cutting edge defined at an intersection between the top surface and one of the side surfaces;
a corner radius cutting edge defined at an intersection between the top surface and one of the side surfaces;
a facet radius cutting edge defined at an intersection between the top surface and one of the side surfaces; and
a ramping cutting edge defined at the intersection between the top surface and one of the side surfaces.

18. A compression milling cutter for machining a laminated material, said compression milling cutter comprising:
a front cutting portion having a first circumferential row having at least two insert receiving pockets proximate a leading end of the milling cutter, and a second circumferential row having at least two insert receiving pockets proximate the first circumferential row, each insert receiving pocket configured to receive a respective indexable cutting insert;
wherein a first cutting insert mounted in the first circumferential row has a first positive axial rake angle, A, and wherein a second cutting insert of the first circumferential row has a second positive axial rake angle, A, such that chips generated by the first and second cutting inserts during an operation of machining a laminated material are guided in a first direction,
wherein a third cutting insert mounted in the second circumferential row has a first negative axial rake angle, B, and wherein a fourth cutting insert of the second circumferential row has a second negative axial rake angle, B, such that chips generated by the third and fourth cutting inserts during the an operation of machining a laminated material are guided in a second direction opposite the first direction, thereby creating a compression zone disposed between the first and second circumferential rows, and
wherein the first cutting insert mounted in the first circumferential row and the third indexable cutting insert mounted in the second circumferential row are disposed along a helix with respect to one another.

19. The compression milling cutter of claim 18 , wherein the first positive axial rake angle, A, is different than the second positive axial rake angle, A.

20. The compression milling cutter of claim 18 , wherein the first negative axial rake angle, B, is different than the second negative axial rake angle, B.

21. The compression milling cutter of claim 1 , wherein the operation of machining a laminated material is an operation of machining a FRP material.

22. The compression milling cutter of claim 1 , wherein the operation of machining a laminated material replicates a cutting action of a solid end mill in machining a laminated material.

23. The compression milling cutter of claim 1 , comprising one or more helical flutes.

Assignees

• Kennametal Inc

Inventors

• Slusarcyk Joseph
• Long Ii Thomas J
• Marshall Tim J
• Dudzinsky Ronald Louis

Classifications

• B23C2200/0416

  Irregular · CPC title

• B23C2210/0414

  different · CPC title

• B23C2210/28

  Arrangement of teeth · CPC title

• B23C2200/125

  discontinuous · CPC title

• B23C2210/045

  axial rake angle · CPC title