Punching device for use during internal high pressure forming has punching die held by spring-loaded locking elements in holder block

摘要

The device has a punching die (14) moved into the hollow mold interior. The die is fitted into a plug aperture (17) in a holder block (18) against its direction of advance and held in place by a lock fastener. This acts like a barb and prevents withdrawal of the die. The block contains locking element (21,22), moved against a spring (23,24), to engage into a locking aperture (27,28) in the die.