Method and a device for manufacturing a cutting insert green body

Patent metadata

Field	Value
Publication number	US-9956611-B2
Application number	US-201515303652-A
Country	US
Kind code	B2
Filing date	Mar 20, 2015
Priority date	Apr 16, 2014
Publication date	May 1, 2018
Grant date	May 1, 2018

Abstract

A device for manufacturing a cutting insert green body by compacting a powder includes a die having an upper die part and a lower die, an upper punch and a lower punch, at least one of which is moveable along a pressing axis in relation to the die. The upper and lower die parts, when joined, define a die cavity that defines the shape of the green body to be formed by the compaction. At least one of the lower and upper die part has a pressing bore extending from the cavity for receiving the lower and upper punch. The upper die part has an upper surface that, at least in one direction, extends rectilinearly, and the upper die part has an upper opening in the upper surface, through which the upper punch is arranged to be forwarded into the cavity.

First claim

The invention claimed is:

1. A method of compacting a powder into a cutting insert green body, such that said cutting insert green body obtains a barrel-shape having a parting line on an outer peripheral surface thereof, which is at least partially non-perpendicular to a pressing axis along which said compacting is performed, said method comprising the steps of:
providing a compaction tool including a die having an upper die part, a lower die part, an upper punch and a lower punch, wherein the upper and lower die parts, when joined together, define a die cavity that is delimited by an inner peripheral surface that defines the shape of the outer peripheral surface of the barrel-shaped green body to be formed by said compaction;
providing at least one of the lower die part and the upper die part with a pressing bore extending from said die cavity, for receiving the lower punch or the upper punch in connection with said compacting;
providing the lower die part with an upper inner edge that extends along a line defining the parting line of the green body;
providing the upper die part with a lower inner edge that extends along a line defining the parting line of the green body;
providing the upper die part with an upper surface that, at least in one direction, extends rectilinearly;
providing the upper die part with an upper opening in said upper surface, through which the upper punch is arranged to be forwarded into said cavity;
positioning the upper die part above the lower die part such that the lower inner edge of the upper die part is contiguously arranged in relation to the upper inner edge of the lower die part;
positioning the upper punch in a retracted position relative the upper opening of the upper die part;
filling powder into the die through said upper opening in the upper surface of the upper die part;
compacting the powder by forwarding at least the upper punch towards said cavity;
retracting the upper punch; and
exposing the green body by retracting the upper die part from the lower die part.

2. The method according to claim 1 , further comprising the step of providing a powder-filling device and positioning it on top of said upper opening in the upper die part or removing it from said position by permitting it to slide on said upper surface of the upper die part in said direction in which said surface extends rectilinearly.

3. The method according to claim 2 , wherein the upper die part is retracted from the lower die part through a rectilinear motion in the direction of the pressing axis.

4. A device for manufacturing a cutting insert green body by compacting a powder, said device comprising:
a die including an upper die part and a lower die part that are separable from each other, an upper punch, and a lower punch, at least one of which is moveable along a pressing axis in relation to the die, wherein the upper and lower die parts, when joined, define a die cavity that is delimited by an inner peripheral surface that defines the shape of the outer peripheral surface of the green body to be formed by said compaction, and wherein said inner peripheral surface of the die cavity is arranged such that the green body obtains a barrel-shape having a parting line on the outer peripheral surface thereof which at least partially is non-perpendicular to said pressing axis, and wherein at least one of the lower die part and the upper die part has a pressing bore extending from said cavity, for the lower punch and upper punch respectively to be received in the device;
the lower die part having an upper inner edge that extends along a line defining the parting line of the green body;
the upper die part having a lower inner edge that extends along a line defining the parting line of the green body;
the upper die part having an upper surface that, at least in one direction, extends rectilinearly; and
the upper die having an upper opening in said upper surface, through which the upper punch is arranged to be forwarded into said cavity.

5. The device according to claim 4 , wherein the lower die part has an upper surface, which is delimited by said upper inner edge and which, from a centre axis of said cavity parallel with the pressing axis, extends in a lateral direction from said upper inner edge, the upper die part having a lower surface which is delimited by said lower inner edge thereof and which, from said centre axis, extends in a lateral direction, wherein at least parts of the upper surface of the lower die part and the lower surface of the upper die part are in bearing contact with each other when the upper and lower die parts are joined and the lower inner edge of the upper die part and the upper inner edge of the lower die part are contiguously arranged in relation to each other and the inner cavity is defined.

6. The device according to claim 5 , wherein said upper and lower surfaces have corresponding extensions and are in bearing contact with each other along a whole area thereof when the upper and lower die parts are joined and the lower inner edge of the upper die part and the upper inner edge of the lower die part are contiguously arranged in relation to each other and the inner cavity is defined.

7. The device according to claim 4 , wherein the upper surface of the upper die part is flat.

8. The device according to claim 7 , wherein the upper surface of the upper die part extends in a plane perpendicular to the pressing axis.

9. The device according to claim 4 , wherein the die includes an outer die part that laterally encloses the upper and lower die parts when the upper and lower die parts are joined.

10. The device according to claim 9 , wherein the outer die part has an upper surface that is arranged so as to coincide with the upper surface of the upper die part when the latter is joined with the lower die part and the device is set for filling of powder into said die cavity.

11. The device according to claim 9 , wherein the upper die part is displaceable in the direction of the pressing axis in relation to the outer die part.

12. The device according to claim 4 , further comprising a powder-filling device arranged to slide on said upper surface of the upper die part in said least one direction in which the upper surface extends rectilinearly to and from a powder-filling position on top of said upper opening of the upper die part.

13. The device according to claim 4 , wherein the upper die part presents an extension which is connected to an actuator such that a displacement of the upper die part in the direction of the pressing axis is enabled.

14. The device according to claim 4 , wherein the cutting insert green body, the outer peripheral surface of which is defined by the inner peripheral surface of the die cavity, presents an upper end, a lower end and a waist between said upper end and lower end, and that, in at least one radial direction as seen from a centre axis of the cutting insert green body, the waist has a lateral extension that is larger than the corresponding lateral extension of the cutting insert green body anywhere from the waist to the upper end of the cutting insert green body and anywhere from the waist to the lower end of the cutting insert green body.

Assignees

• Seco Tools Ab

Inventors

• Sterkenburg Dirk

Classifications

• B30B15/022

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

• B22F3/03 Primary

  Press-moulding apparatus therefor · CPC title

• B22F2005/001

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

• B30B15/304

  by using feed frames or shoes with relative movement with regard to the mould or moulds · CPC title

• B22F5/00 Primary

  Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product · CPC title