HOT FORMING DIE, PRESS FORMING APPARATUS, AND HOT PRESS FORMING METHOD

摘要

A hot forming die for a press forming apparatus press-forms a heated metal plate (work material) (4) and cools the work material by ejecting a cooling medium onto the work material. The hot forming die has a main supply path (10a) through which the cooling medium passes, a plurality of branch supply paths (10b) branching off the main supply path and including ejection ports (10c) for ejecting the cooling medium to the outside of the die, and nozzle members (11) fixed on the ejection port side of the branch supply paths to restrict the passage amount of the cooling medium by using passage holes (11a) for allowing the cooling medium to pass therethrough. In a hot press forming method, the cooling medium in the die is held on standby after being pressurized to a degree at which the cooling medium is not ejected. The cooling medium is further pressurized to a pressure higher than the pressure at the standby time at predetermined timing during or after pressing and then is ejected onto the work material.