In-die hydropiercing apparatus with prepiercing adjustment

摘要

Hydroforming apparatus includes in-die hydropiercing apparatus with easy and precise adjustment of the positioning of a backup plunger that is received in a die button and is positioned in a hydroforming position, a prepiercing position, a piercing position, and a slug ejecting position that may be outside the plunger or may be the hydroforming position. Wherein the plunger is required to be precisely positioned and held in the prepiercing position in the die button in order to obtain a desired prepiercing action without prematurely piercing the hydroformed part. The in-die hydropiercing apparatus has a plunger actuating hydraulic cylinder that moves the plunger to the different positions and a cam actuating hydraulic cylinder that positions a cam in determining the prepiercing position of the plunger. The cam actuator includes an adjusting device that provides for easily adjusting positioning of the plunger with the cam in the required prepiercing position and the cam with its hydraulic actuator also acts to hold the plunger in the prepiercing position thereby relieving the plunger actuating hydraulic cylinder of this duty.