Processes for producing fine grained metal compositions using continuous extrusion for semi-solid forming of shaped articles
US6120625A · kind A · utility
Inventors
Key dates
| Filing date | Jun 10, 1998 |
| Grant date | Sep 19, 2000 |
| Priority date | — |
| Expiry date | Jun 10, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21J5/004
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
There are provided a continuous frictional extrusion process for continuously producing a deformed fine grain solid metal composition suitable for semi-solid forming. The process is featured by a large range of produce dimension and by precise control of the process parameter, such as total deformation, extrusion temperature and speed. The total deformation is controlled to be larger than a Mises effective strain of 2.3 to obtain a deformed fine grain structure with enough distortion energy stored, having a grain size less than 30 .mu.m and a subgrain size less than 2 .mu.m. A method combining the continuous extrusion process of preparing semi-solid raw material with semi-solid forming of shaped articles is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.