公开(公告)号：US3670545A

公开(公告)日：1972-06-20

申请号：US3670545D

申请日：1970-10-29

Applicant: MC DONNELL DOUGLAS CORP

Inventor： KENT RONALD E ,  ROTHENBERGER ALVIN C

IPC: B21C37/29 ,  B21D22/10 ,  B21D9/05

CPC classification number: B21C37/294 ,  B21D22/105 ,  Y10T29/49442

Abstract: Power cylinders at each end of a tubular workpiece having a force transmitting medium therein operable by the cylinders to force the workpiece into mold cavities. The force transmitting medium is an incompressible plastic such as a polyurethane plug with a memory which returns to its original configuration when the pressure is removed. The retention force between the opposing cylinders is transmitted through the mold die.

Abstract translation: 在管状工件的每一端处的动力缸具有力传递介质，其中可由气缸操作以迫使工件进入模腔。 力传递介质是不可压缩的塑料，例如具有存储器的聚氨酯塞子，​​当压力被去除时，其返回到其初始构造。 相对的气缸之间的保持力通过模具模具传递。