Method and arrangement for manufacturing a cutting insert

Patent metadata

Field	Value
Publication number	US-9713845-B2
Application number	US-201414290475-A
Country	US
Kind code	B2
Filing date	May 29, 2014
Priority date	May 30, 2013
Publication date	Jul 25, 2017
Grant date	Jul 25, 2017

Abstract

A method for manufacturing a cutting insert having a through-hole that extends in a direction that is non-parallel to the main pressing direction. The method includes the steps of moving first and second punches within a die cavity toward each other along a first pressing axis and compacting a powder around a core rod into a cutting insert green body, wherein, during at least a portion of the compaction step, the core rod is turned a predetermined angle in alternating direction around its longitudinal axis.

First claim

The invention claimed is:

1. A method for manufacturing a cutting insert having a through-hole, by using a press tool including a die having a die cavity extending through the die along a first pressing axis, a first punch and a second punch, which are movable toward and away from each other and along said first pressing axis, and a core rod, that is arranged to be inserted into the die cavity in a direction which is non-parallel to the first pressing axis, the method comprising the steps:
moving the first and second punches to a die filling position;
inserting the core rod into the die cavity;
filling the die cavity with powder;
moving the first and second punches within the die cavity toward each other along the first pressing axis to compact the powder around the core rod into a cutting insert green body;
moving the core rod and the first and second punches to an ejection position to allow removal of the cutting insert green body from the die; and
sintering the cutting insert green body, wherein during at least a portion of the compaction step, the core rod is turned a predetermined angle in alternating directions around its longitudinal axis.

2. The method according to claim 1 , wherein the core rod is turned in the same predetermined angle around its longitudinal axis.

3. The method according to claim 1 , wherein the core rod is turned in different predetermined angles around its longitudinal axis.

4. The method according to claim 1 , wherein the predetermined angle is <180°.

5. The method according to claim 4 , wherein the predetermined angle is 5°-40°.

6. The method according to claim 1 , wherein the core rod is turned during 50-95% of the compaction step.

7. The method according to claim 1 , wherein the core rod is inserted into the die cavity in a direction perpendicular to the first pressing axis.

8. The method according to claim 1 , wherein the core rod is turned a predetermined number of times during said compaction step.

9. The method according to claim 8 , wherein the velocity of the punches is controlled during the compaction step depending upon the predetermined number of turns of the core rod.

10. The method according to claim 1 , wherein the force applied on the opposing punches is measured during the compaction step and used to control the turning angle and/or the number of turns of the core rod.

11. The method according to claim 1 , wherein the predetermined angle is <90°.

12. The method according to claim 11 , wherein the predetermined angle is 5°-40°.

13. The method according to claim 11 , wherein the predetermined angle is 10-30°.

14. The method according to claim 11 , wherein the predetermined angle is 5-20°.

15. The method according to claim 11 , wherein the predetermined angle is 10-20°.

Assignees

• Sandvik Intellectual Property

Inventors

• Staf Hjalmar

Classifications

• B22F3/03 Primary

  Press-moulding apparatus therefor · CPC title

• B23B27/1662 Primary

  with plate-like cutting inserts clamped against the walls of the recess in the shank by a clamping member acting upon the wall of a hole in the cutting insert (B23B27/1677 takes precedence) · CPC title

• B22F2005/001

  Cutting tools, earth boring or grinding tool other than table ware · CPC title

• B30B11/027

  Particular press methods or systems · CPC title

• B22F3/12

  Both compacting and sintering (by forging B22F3/17) · CPC title