Closed forging die and forging method

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：US20080184765A1公开日：20080807

专利附图：

摘要：The present invention provides a closed forging die and a forging method withwhich sagging can be reduced, a constant velocity joint and a universal joint can be madecompact and lightweight, remove of a shaft tip thereof by machining prior to heattreatment is not required, and material costs and machining costs can be reduced. The

closed forging die according to the present invention includes openable dies (), andpunches () that move in an opening/closing direction of the dies () to pressurize a materialin the dies (). By using the die, a product () having shaft portions () formed radially ismanufactured. A clearance () is provided to each of the formed shaft portions () betweena tip surface (), and abutting portions () are provided to the dies side abutting against atleast 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,Shizouka-ken JP,Shizuoka-ken JP

国籍：JP,JP,JP

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