Process for obtaining a mechanical component

Patent metadata

Field	Value
Publication number	US-9555501-B2
Application number	US-201414782797-A
Country	US
Kind code	B2
Filing date	Apr 7, 2014
Priority date	Apr 9, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A process for obtaining a mechanical component by joining a first metallic material and a second metallic material. The process comprises: (A) putting the first material and the second material in contact with each other, (B) fixating a sheet metal element onto the first material to at least partly enclosing the second material and so that the sheet metal element is at least partly in contact with the second material. The sheet metal element comprises carbon, joining the first material and the second material by diffusion welding. The carbon activity of the second material Ca 2 and the carbon activity of the sheet metal element Ca m at the temperature of joining fulfills a relation Ca 2 ≦Ca m .

First claim

The invention claimed is:

1. A process for obtaining a mechanical component by joining a first and a second metallic material, the process comprising steps of:
(A) putting the first and the second material in contact with each other;
(B) fixating a sheet metal element onto the first material to at least partly enclosing the second material and so that the sheet metal element is at least partly in contact with the second material, wherein the sheet metal element comprises carbon;
(C) joining the first and second material by means of diffusion welding; and
wherein the carbon activity of the second material Ca 2 and the carbon activity of the sheet metal element Ca m at the temperature of joining fulfills the relation Ca 2 ≦Ca m .

2. The process according to claim 1 ,
wherein the sheet metal element is enclosing the second material and creates a closed space for the second material.

3. The process according to claim 1 ,
wherein the second material, before it is joined, is in a form of a metallic powder.

4. The process according to claim 1 ,
wherein the carbon activity of the second material Ca 2 and the carbon activity of the sheet metal element Ca m at the temperature of joining fulfills the relation Ca 2 <Ca m .

5. The process according to claim 1 ,
wherein the sheet metal element further comprises nitrogen.

6. The process according to claim 1 ,
wherein the second material is a high performance bearing steel.

7. The process according to claim 6 ,
wherein the high performance bearing steel is one of:
M50,
M50 NIL,
XD15NW,
Bearing steel as shown in ISO 683-17:1999(E) pages 9-10,
Stainless tool steel,
Stainless steel suitable for martensitic hardening,
N-alloyed stainless steel, suitable for martensitic hardening, or
Stainless steel suitable for surface enrichment and martensitic hardening.

8. The process according to claim 1 ,
wherein the first material is one of:
a cast iron,
a cast steel,
a hot rolled steel, or
a cold rolled steel.

9. The process according to claim 1 ,
wherein the mechanical component is a bearing component.

10. The process according to claim 9 ,
wherein the bearing component is one of:
an inner ring of a bearing,
an outer ring of a bearing, or
a roller of a roller bearing.

11. The process according to claim 1 ,
wherein the diffusion welding is made by hot isostatic pressing (HIP).

Assignees

• Skf Ab

Inventors

• Strandell Ingemar

Classifications

• B23K20/021

  Isostatic pressure welding · CPC title

• F16C33/64

  Special methods of manufacture · CPC title

• B23K20/023 Primary

  Thermo-compression bonding · CPC title

• F16C33/62

  Selection of substances · CPC title

• B22F7/08

  with one or more parts not made from powder {(B22F7/062 takes precedence)} · CPC title