公开(公告)号：US06347900B1

公开(公告)日：2002-02-19

申请号：US09717004

申请日：2000-11-22

申请人： Kiyoshi Sadakata ,  Yoshihide Sasamoto ,  Shuji Hitani

发明人： Kiyoshi Sadakata ,  Yoshihide Sasamoto ,  Shuji Hitani

IPC分类号： F16C1106

CPC分类号： B21D28/32 ,  Y10T29/49622 ,  Y10T29/49996 ,  Y10T83/0505 ,  Y10T83/2031 ,  Y10T83/9423 ,  Y10T403/32181

摘要： A yoke for a universal joint is produced by press forming of a steel sheet, and mutually concentric circular holes are formed by press punching at the tip ends of a pair of arms opposite to each other. After the circular holes are punched by inserting a punching punch through the tip ends of the arms in the state that the backs of the arms are supported by a die relative to the punching direction and the outer peripheries of these arms are restrained by a restraining member in the vicinity of a portion in which the circular holes are to be formed, a finishing punch is inserted from the direction opposite to the punching punch into the punched circular holes, thereby improving the accuracy of the circular holes.

摘要翻译： 用于万向接头的轭通过冲压成形制成，并且通过在彼此相对的一对臂的末端处的冲压冲压形成相互同心的圆形孔。 在通过将冲头穿过臂的前端插入冲孔后，在臂的背面相对于冲孔方向由模具支撑的状态下，并且这些臂的外周被限制构件约束 在要形成圆形孔的部分附近，将精整冲头从与冲孔冲头相反的方向插入冲孔圆孔中，从而提高圆孔的精度。