Invention Grant
- Patent Title: Method for manufacturing metallic bellows
- Patent Title (中): 金属波纹管制造方法
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Application No.: US10976764Application Date: 2004-11-01
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Publication No.: US07399372B2Publication Date: 2008-07-15
- Inventor: Hideki Okada
- Applicant: Hideki Okada
- Applicant Address: JP Kanagawa
- Assignee: NHK Spring Co., Ltd.
- Current Assignee: NHK Spring Co., Ltd.
- Current Assignee Address: JP Kanagawa
- Agency: Oliff & Berridge, PLC
- Priority: JP2003-378977 20031107
- Main IPC: C21D8/10
- IPC: C21D8/10
Abstract:
A metallic bellows, composed of precipitation hardening stainless steel, includes ridge portions and valley portions formed alternately and continuously, an average grain size of 10 to 15 μm, and compressive residual stress of not less than 500 MPa provided to at least surfaces of the ridge portions and the valleys by surface working.
Public/Granted literature
- US20050098244A1 Metallic bellows, manufacturing method therefor, and accumulator therewith Public/Granted day:2005-05-12
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