发明名称 |
Method of making valve guide by forming a not hollowed compact by uniaxial pressure perpendicular to its longitudinal axis |
摘要 |
A powder metallurgy method for making valve guides for use in internal combustion engines advantageously utilizes uniaxial side pressing to form compacts. Such compacts are subsequently sintered, formed into a cylindrical shape, and then hollowed to form a valve guide. The valve guides exhibit improved uniformity and density and hardness from end to end of the valve guide when contrasted to powder metal valve guides formed with uniaxial end pressing. |
申请公布号 |
EP1629908(B1) |
申请公布日期 |
2008.09.17 |
申请号 |
EP20050105597 |
申请日期 |
2005.06.23 |
申请人 |
HELIO PRECISION PRODUCTS, INC. |
发明人 |
LIVINGSTON, HOWARD M.;BLACKWELL, C. BRUCE |
分类号 |
B22F3/03;B22F3/16;B22F5/10;B29C43/02;F01L3/08 |
主分类号 |
B22F3/03 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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