# US 5,344,716 A · Method of producing metallic sinter bodies, as well as sinter body in particular pressing tool

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- Number: US 5,344,716 A
- Document ID: US5344716A
- Status: Granted
- Kind: A
- Application number: 07/927,854
- Filed: 1992-08-10
- Granted: 1994-09-06
- Earliest claimed: 1991-08-08
- Assignees: Firma Ernst Winter & Sohn (GmbH & Co.)
- Inventors: Dietrich Borse
- Web page: https://patentgrep.com/patent/US5344716A

## CPC

- B01J 3/065: {Presses for the formation of diamonds or boronitrides}
- B22F 5/007: {of moulds}
- B22F 5/10: of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B30B 11/004: {involving the use of very high pressures, (for the formation of artificial diamonds or boronitrides B01J3/065)}
- B30B 15/065: {Press rams}
- B22F 2998/10: Processes characterised by the sequence of their steps
- B22F 2999/00: Aspects linked to processes or compositions used in powder metallurgy
- Y10T 428/12014: having metal particles
- Y10T 428/12153: Interconnected void structure [e.g., permeable, etc.]
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B30B: PRESSES IN GENERAL (producing ultra-high pressure or ultra-high pressure and high temperature to effect modifications of a substance, e.g. for making artificial diamonds B01J3/00 ){(compressing means for refuse receptacles B65F1/1405)}
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

In accordance with a method of producing metal sinter bodies, the bodies are provided with degassing openings which are made preferably before sintering of an initial press body part.

## Claims

### Claim 1

A method of producing hard alloy sinter bodies which form press tools in form of a plunger and a matrix with regions which are loaded higher and regions which are less loaded during use of the tools, the method comprising the steps of forming a press body; sintering the press body; and providing in the formed press body before said sintering degassing passages located in said less loaded regions and formed as blind openings for degassing the press body during the sintering.

### Claim 2 (depends on 1)

A method as defined in claim 1; and further comprising the step of forming in the press body additional degassing passages as throughgoing passages.

### Claim 3

A hard alloy sinter body which forms press tools including a plunger and a matrix for a pressing apparatus, the hard alloy sinter body comprising a body part having an outer side and a cross-section region which is less loaded and a cross-section region which is loaded higher during use of the tools, said body part having at least one degassing passage which opens on said outer side in said less loaded cross-section region and is formed as a blind opening for degassing the body part during sintering.

### Claim 4 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said body part has additional degassing passages formed as throughgoing openings.

### Claim 5 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said degassing passages are formed as axial passages.

### Claim 6 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said degassing passages are formed as radial passages.

### Claim 7 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said degassing passages are formed as axial and radial passages.

### Claim 8 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said body part is a pressing tool and has a lower pressing side and an upper opposite side, said degassing passages extend to aid upper side of said body part.

### Claim 9 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said body part is formed as a pressing plunger having an upper side and a lower plunger working surface, said body part having only one said degassing passage which is formed as a cross-section region which is less loaded and a cross-section region which is loaded higher during use of the tools opening and extends centrally from said upper side of said body part in direction to said lower plunger working surface.

### Claim 10 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said body part has a plurality of said degassing passages.

### Claim 11 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said at least one degassing passage has a diameter of substantially between 2 and 8 mm.

### Claim 12 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said body part has a plurality of said degassing passages which are arranged on concentric partial circles.

### Claim 13 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said body part is formed as an ultrahigh pressure plunger with an outer diameter which is greater than 80 mm and a total height which is greater than 60 mm.

### Claim 14 (depends on 3)

A hard alloy sinter body as defined in claim 3, wherein said body part is formed as an ultrahigh pressure matrix with an inner diameter which is greater than 40 mm, an outer diameter which is greater than 120 mm, and a total height which is greater than 60 mm.