发明授权
- 专利标题: Closed forging die and forging method
- 专利标题(中): 封闭锻造和锻造方法
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申请号: US12007099申请日: 2008-01-07
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公开(公告)号: US07900493B2公开(公告)日: 2011-03-08
- 发明人: Miao Jiahua , Akira Sera , Nobuo Suzuki
- 申请人: Miao Jiahua , Akira Sera , Nobuo Suzuki
- 申请人地址: JP Osaka-fu
- 专利权人: NTN Corporation
- 当前专利权人: NTN Corporation
- 当前专利权人地址: JP Osaka-fu
- 代理机构: Wenderoth, Lind & Ponack, L.L.P.
- 优先权: JP2007-024346 20070202
- 主分类号: B21D22/00
- IPC分类号: B21D22/00
摘要:
A closed forging die and a forging method with which sagging can be reduced, a constant velocity joint and a universal joint can be made compact and lightweight, removal of a shaft tip thereof by machining prior to heat treatment is not required, and material costs and machining costs can be reduced by using a closed forging die includes openable dies, and punches that move in an opening/closing direction of the dies to pressurize a material in the dies. By using the die, a product having shaft portions formed radially is manufactured. A clearance is provided to each of the formed shaft portions between a tip surface, and abutting portions are provided to the dies side abutting against at least a tip side of an outer circumferential surface of the shaft portions.
公开/授权文献
- US20080184765A1 Closed forging die and forging method 公开/授权日:2008-08-07
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