Invention Grant
- Patent Title: Method for heat treatment of coiled spring
- Patent Title (中): 螺旋弹簧热处理方法
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Application No.: US13052522Application Date: 2011-03-21
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Publication No.: US08460483B2Publication Date: 2013-06-11
- Inventor: Takashi Yajima , Hideki Okada , Katsuyuki Nishioka , Takeshi Furuse
- Applicant: Takashi Yajima , Hideki Okada , Katsuyuki Nishioka , Takeshi Furuse
- Applicant Address: JP Yokohama-Shi
- Assignee: NHK Spring Co., Ltd.
- Current Assignee: NHK Spring Co., Ltd.
- Current Assignee Address: JP Yokohama-Shi
- Agency: Oliff and Berridge, PLC
- Priority: JP2010-065765 20100323
- Main IPC: C21D9/02
- IPC: C21D9/02 ; C21D8/02
Abstract:
A method for heat treatment of a coiled spring includes cold forming a coiled spring, annealing the coiled spring after the cold forming, thereby removing of residual stress generated in the cold forming, in which the annealing is performed by electric resistance heating.
Public/Granted literature
- US20110232810A1 METHOD FOR HEAT TREATMENT OF COILED SPRING Public/Granted day:2011-09-29
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