Press for making a cutting tool green body having a helical flute, and method for making a cutting tool green body having a helical flute

Patent metadata

Field	Value
Publication number	US-9962856-B2
Application number	US-201415022617-A
Country	US
Kind code	B2
Filing date	Sep 30, 2014
Priority date	Sep 30, 2013
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

A press for making a cutting tool green body having at least one helical flute includes a die having an opening with a helical protrusion and a punch having at least one helical groove having a shape that matches a shape of the helical protrusion. An electrical punch drive system is arranged to simultaneously rotate the punch, relative to a longitudinal axis of the opening in the die, and axially advance the punch into and along a direction of the longitudinal axis of the opening in the die. A method for making a cutting tool green body having at least one helical flute is also disclosed.

First claim

The invention claimed is:

1. A press for making a cutting tool green body having at least one helical flute, the press comprising:
a die having an opening with at least one helical protrusion;
a top punch having at least one helical groove having a shape that matches a shape of the helical protrusion;
a bottom punch having at least one helical groove having a shape that matches the shape the helical protrusion;
a first electrical punch drive system arranged to simultaneously rotate the top punch relative to a longitudinal axis of the opening in the die, and axially advance the top punch into a top end and along a direction of the longitudinal axis of the opening in the die; and
a second electrical punch drive system arranged to simultaneously rotate the bottom punch relative to the longitudinal axis of the opening in the die, and axially advance the bottom punch into a bottom end and along the direction of the longitudinal axis of the opening in the die.

2. The press of claim 1 , wherein the first electrical punch drive system is arranged to move the top punch to an ejection position.

3. The press of claim 1 , wherein the first or second electrical punch drive system includes, for at least one punch of the top punch and the bottom punch respectively, an inner punch drive and an outer punch drive that is axially movable relative to the inner punch drive, the inner punch drive including an auxiliary punch having at least one helical groove, an auxiliary die having at least one protrusion that is received in the helical groove of the auxiliary punch and is rotatably mounted via a bearing in the outer punch drive, the at least one punch being attached to and rotating with the auxiliary die.

4. The press of claim 3 , wherein the helical groove of the auxiliary punch has a different pitch than the helical groove of the at least one punch.

5. The press of claim 3 , wherein the bearing is axially immovable relative to the outer punch drive.

6. The press of claim 3 , wherein the protrusion in the auxiliary die is a helical protrusion.

7. The press of claim 1 , wherein the die has a plurality of helical protrusions.

8. The press of claim 1 , wherein the die has two helical protrusions.

9. The press of claim 1 , wherein at least one of the top punch and the bottom punch is provided with a shape, the punch being arranged to be in contact with the powder, for forming non-planar features in the cutting tool green body.

10. A press for making a cutting tool green body having at least one helical flute, the press comprising:
a die having an opening with at least one helical protrusion;
a top punch having at least one helical groove having a shape that matches a shape of the helical protrusion;
a bottom punch having at least one helical groove having a shape that matches the shape the helical protrusion;
a first electrical punch drive system arranged to simultaneously rotate the top punch relative to a longitudinal axis of the opening in the die, and axially advance the top punch into a top end and along a direction of the longitudinal axis of the opening in the die; and
a second electrical punch drive system arranged to simultaneously rotate the bottom punch relative to the longitudinal axis of the opening in the die, and axially advance the bottom punch into a bottom end and along the direction of the longitudinal axis of the opening in the die, wherein the first or second electrical punch drive system includes, for at least one punch of the top punch and the bottom punch respectively, an outer punch drive, and including an auxiliary die having an opening with a protrusion received in the helical groove of the punch, and an inner punch drive axially movable relative to the outer punch drive, and a bearing that rotatably mounts the punch to the inner punch drive, the at least one punch being screwed into the opening of the auxiliary die.

11. The press of claim 10 , wherein the bearing is axially immovable relative to the inner punch drive.

12. A method of making a cutting tool green body having at least one helical flute, comprising:
supplying an opening in a die having at least one helical protrusion arranged to form the helical flute with a metal carbide powder; and
compressing the powder by
operating a first electrical punch drive system to simultaneously rotate, relative to a longitudinal axis of the opening in the die, and axially advance, into a top end of opening and along a direction of the longitudinal axis of the opening in the die, a top punch having at least one helical groove having a shape that matches a shape of the helical protrusion, and
operating a second electrical punch drive system to simultaneously rotate, relative to a longitudinal axis of the opening in the die, and axially advance, into a bottom end of opening and along a direction of the longitudinal axis of the opening in the die, a bottom punch having at least one helical groove having a shape that matches a shape of the helical protrusion.

13. The method of claim 12 , wherein the step of compressing the powder includes at least one of the top punch and the bottom punch having a shape, where the punch is in contact with the powder, and forming non-planar features in the cutting tool green body.

Assignees

• Seco Tools Ab

Inventors

• Sterkenburg Dirk

Classifications

• B22F3/03 Primary

  Press-moulding apparatus therefor · CPC title

• B28B7/0097

  Press moulds; Press-mould and press-ram assemblies · CPC title

• B22F2005/001

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

• B28B7/0064

  Moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished moulding surfaces (B28B7/36 takes precedence; producing decorative effects B44C; designs of stone surfaces B44F) · CPC title

• B30B15/022

  Moulds for compacting material in powder, granular of pasta form · CPC title