Method of hot stamping galvanized steel sheet
US8926770B2 · kind B2 · utility
8Cited by
1References
5Claims
0Family size
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Key dates
| Filing date | Aug 23, 2011 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | Aug 23, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J5/12
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
In a cooling a galvanized steel sheet (W), change in emissivity of a surface of the galvanized steel sheet (W) is measured in a temperature range lower than the boiling point of zinc but not lower than the ferrite transformation temperature, using an emissivity sensor (4) with an observation wavelength of 1.4 μm or longer, and pressing and quenching in a pressing and quenching apparatus (2) is started after completion of an alloying reaction has been detected based on the change in emissivity. The emissivity sensor (4) preferably has an InGaAs element or a thermopile as a measuring element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.