Mold for casting and method of surface treatment thereof
US7600556B2 · kind B2 · utility
1Cited by
2References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 28, 2003 |
| Grant date | Oct 13, 2009 |
| Priority date | — |
| Expiry date | Oct 28, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22C9/06
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A method of the surface treatment of a mold for casting, which comprises subjecting a cavity surface of a fixed mold made by the use of a SCM420 material to first shot peening, a sulfurizing-nitriding treatment and second shot peening. The resulting cavity surface of the fixed mold exhibits a high hardness of 700 or higher in terms of Vickers hardness due to the presence of a sulfurized and nitrided layer, and further has a compression residual stress of more than 1200 Mpa and a largest height, which is a surface roughness value defined by JIS standard, of 8 μm or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.