Milling cutter with stress reliefs

Patent metadata

Field	Value
Publication number	US-9475131-B2
Application number	US-201313916909-A
Country	US
Kind code	B2
Filing date	Jun 13, 2013
Priority date	Jun 13, 2013
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A cutting tool, such as a milling cutter, includes a tool body and a plurality of pockets for receiving cutting inserts. Each pocket includes a bottom support surface, an radial support surface, an axial support surface, a first corner relief between the bottom support surface and the radial support surface, and a first stress relief formed in the first corner relief at one end of the pocket. The first stress relief is formed at an angle with respect to a plane parallel to the radial support surface. The first stress relief reduces a tensile stress of the cutting tool during a machining operation. A second and third stress relief may be formed in the first corner relief and/or in a second corner relief.

First claim

What is claimed is:

1. A cutting tool comprising:
a tool body including a plurality of pockets for receiving cutting inserts, each pocket comprising a bottom support surface, a radial support surface, an axial support surface, a first corner relief between the bottom support surface and the radial support surface, a second corner relief between the bottom support surface and the axial support surface, and a first stress relief formed in the first corner relief at one end of the pocket, the first stress relief formed at an angle with respect to a plane parallel to the radial support surface,
wherein the first stress relief reduces a tensile stress of the cutting tool during a machining operation.

2. The cutting tool of claim 1 , wherein the first stress relief is circular in cross-sectional shape.

3. The cutting tool of claim 2 , wherein the first stress relief is formed with a second radius, R2, at an intersection with the first corner relief.

4. The cutting tool of claim 2 , wherein the first stress relief is formed with a first radius, R1, at an intersection with a front end of the tool body.

5. The cutting tool of claim 1 , further comprising a second stress relief formed in the second corner relief, the second stress relief formed at an angle with respect to a plane parallel to the axial support surface.

6. The cutting tool of claim 5 , wherein the second stress relief is circular in cross-sectional shape.

7. The cutting tool of claim 5 , wherein the second stress relief is formed with a first radius, R1, at an intersection with an outer periphery of the tool body.

8. The cutting tool of claim 5 , wherein the second stress relief is formed with a third radius, R3, at an intersection with the second corner relief.

9. The cutting tool of claim 1 , further comprising a third stress relief formed in the first corner relief at an opposite end of the pocket, the third stress relief formed at an angle with respect to the plane parallel to the radial support surface.

10. The cutting tool of claim 9 , wherein the third stress relief is circular in cross-sectional shape with a first radius R1.

11. The cutting tool of claim 9 , wherein the third stress relief is formed with a third radius, R3, at an intersection with the first corner relief.

12. A cutting tool comprising:
a tool body including a plurality of pockets for receiving cutting inserts, each pocket comprising a bottom support surface, a radial support surface, an axial support surface, a first corner relief between the bottom support surface and the radial support surface, a second corner relief between the bottom support surface and the axial support surface, a first stress relief formed in the first corner relief at one end of the pocket, the first stress relief formed at an angle with respect to a plane parallel to the radial support surface, and a second stress relief formed in the second corner relief at another end of the pocket, the second stress relief formed at an angle with respect to a plane parallel to the axial support surface,
wherein the first and second stress reliefs reduce a tensile stress of the cutting tool during a machining operation.

13. The cutting tool of claim 12 , wherein the first and second stress reliefs are circular in cross-sectional shape.

14. The cutting tool of claim 12 , wherein the first stress relief is formed with a second radius, R2, at an intersection with the first corner relief, and wherein the second stress relief is formed with a third radius, R3, at an intersection with the first corner relief.

15. The cutting tool of claim 12 , wherein the first stress relief is formed with a first radius R1, at an intersection with a front end of the tool body.

16. The cutting tool of claim 12 , wherein the second stress relief is formed with a first radius R1, at an intersection with an outer periphery of the tool body.

17. A cutting tool comprising:
a tool body including a plurality of pockets for receiving cutting inserts, each pocket comprising a bottom support surface, a radial support surface, an axial support surface, a first corner relief between the bottom support surface and the radial support surface, a second corner relief between the bottom support surface and the axial support surface, a first stress relief formed in the first corner relief at one end of the pocket, the first stress relief formed at an angle with respect to a plane parallel to the radial support surface, and a third stress relief formed in the first corner relief at an opposite end of the pocket, the third stress relief formed at an angle with respect to the plane parallel to the radial support surface,
wherein the first and third stress reliefs reduce a tensile stress of the cutting tool during a machining operation.

18. The cutting tool of claim 17 , wherein the first and third stress reliefs are circular in cross-sectional shape.

19. The cutting tool of claim 17 , wherein the first stress relief is formed with a second radius, R2, at an intersection with the first corner relief, and wherein the third stress relief is formed with a third radius, R3, at an intersection with the first corner relief.

Assignees

• Kennametal Inc

Inventors

• Waggle James Michael
• Dudzinsky Ronald Louis

Classifications

• B23C5/2208

  for plate-like cutting inserts  (B23C5/2226, B23C5/2234 take precedence) · CPC title

• B23C2200/165

  with one or more grooves · CPC title

• Y10T407/1948

  with cutting edge entirely across end of tool [e.g., router bit, end mill, etc.] · CPC title

• B23C5/109 Primary

  with removable cutting inserts · CPC title

• B23C5/003 Primary

  with vibration suppressing means · CPC title