Cooling method for hot press forming and hot press forming apparatus
US10195656B2 · kind B2 · utility
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10Claims
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Key dates
| Filing date | Sep 11, 2014 |
| Grant date | Feb 5, 2019 |
| Priority date | — |
| Expiry date | Aug 8, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D22/208
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In hot press forming a thin steel sheet K, when cooling the thin steel sheet K by supplying a refrigerant to an ejection hole (27) communicated from a supply path (28) inside a lower mold (12), precooling in which an ejection amount per unit time period of the refrigerant from the ejection hole (27) is suppressed is carried out, and thereafter, main cooling is carried out by increasing the ejection amount per unit time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.