Patent ID: 6205828
Filing Date: 2001-03-27
Classification: B21J,B21K

Abstract:
A control apparatus for a forging die for forging a forging material by relatively displacing a first die member and a second die member to apply a pressurizing force of a punch member to said forging material charged in a cavity said punch member being movably disposed with respect to one of said first die member and said second die member under action of a pressure fluid, said control apparatus comprising:a buffering mechanism for absorbing a residual displacement amount of said punch member before arrival of said punch member at a bottom dead center position within said cavity after abutment between said first die member and said second die member, and then permitting further movement of said punch member to said bottom dead center position in said cavity in accordance with an action of said pressure fluid charged in a pressure chamber as a result of said relative displacement of said first die member and said second die member; anda discharge mechanism comprising a relief valve having a relief chamber chargeable with said pressure fluid, for forcibly discharging said pressure fluid from said pressure chamber to the outside through said relief valve when a pressure of said pressure fluid in said pressure chamber arrives at a relief preset pressure as a result of application of a forming load to said pressure fluid charged in said pressure chamber.