专利名称：Closed forging die and forging method发明人：Miao Jiahua,Akira Sera,Nobuo Suzuki申请号：US12007099申请日：20080107公开号：US07900493B2公开日：20110308
专利附图：
摘要：A closed forging die and a forging method with which sagging can be reduced, aconstant 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, andmaterial 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 topressurize a material in the dies. By using the die, a product having shaft portions formedradially is manufactured. A clearance is provided to each of the formed shaft portionsbetween a tip surface, and abutting portions are provided to the dies side abuttingagainst at least a tip side of an outer circumferential surface of the shaft portions.
申请人：Miao Jiahua,Akira Sera,Nobuo Suzuki
地址：Shizuoka-ken JP,Shizuoka-ken JP,Shizuoka-ken JP
国籍：JP,JP,JP
代理机构：Wenderoth, Lind & Ponack, L.L.P.
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