发明授权
- 专利标题： Method of forming spark plug bodies
- 专利标题（中）： 形成火花塞体的方法
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申请号： US241145申请日： 1981-03-06
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公开(公告)号： US4352283A公开(公告)日： 1982-10-05
- 发明人: Robert J. Bailey
- 申请人： Robert J. Bailey
- 申请人地址： MI Dearborn
- 专利权人： Ford Motor Company
- 当前专利权人： Ford Motor Company
- 当前专利权人地址： MI Dearborn
- 主分类号： B21K21/08
- IPC分类号： B21K21/08 ; H01T21/02 ; B21D22/00
摘要：
A method of manufacturing a hollow spark plug body having a cylindrical central portion (28), a first end portion (10) of smaller circular radial cross-section and a second end portion of non-circular radial cross-section, e.g. hexagonal, and of smaller maximum diameter than the central portion by cold extruding the both end portions. The second end portion is extruded in two stages, the first involving the formation of a recess in one end of a cylindrical blank, the second involving extrusion the blank between a die (19) and a mandrel (21) which moves with the blank during extrusion.
公开/授权文献
- USD310852S Simulative rocker 公开/授权日：1990-09-25