公开(公告)号：US3777528A

公开(公告)日：1973-12-11

申请号：US3777528D

申请日：1970-11-19

Applicant: CEFILAC

Inventor： SIRANTOINE A

IPC: B21C23/01 ,  B21J5/10 ,  B21C23/32

CPC classification number: B21J5/10 ,  B21C23/01

Abstract: A billet containing an axially cold drilled cylindrical pilot hole and previously heated to deformation temperature is inserted into a hot piercing press. The pilot hole is flared at its forward end by a hot punching operation in the press itself prior to the application of the lubricant and the expansion operation. The hot punching can be done by a punching tool or by an expansion tool and the force of the press can be transmitted to the expansion tool in the expansion operation directly through a spindle or through the punching tool.

Abstract translation: 将含有预先加热到变形温度的轴向冷钻圆柱形引导孔的坯料插入热穿孔压机中。 在施加润滑剂和膨胀操作之前，导向孔在其前端通过热冲压本身的热冲压操作而张开。 热冲压可以通过冲压工具或膨胀工具完成，并且压力机的力可以在膨胀操作中直接通过主轴或冲压工具传递到膨胀工具。