MANUFACTURE FOR FORGING LIGHT METAL-MADE BLANK AND MANUFACTURE OF FORGED MEMBER USING THIS BLANK

摘要

PROBLEM TO BE SOLVED: To surely prevent the development of blister accompanied with a heat treatment to a product (forged member) with the forging in the case of obtaining a light metal-made finish product by forming a blank for forging and forging this blank. SOLUTION: In the producing method of the light metal-made blank for forging supplied as the forging blank for obtaining the light metal-made forged member, molten light metal is fitted into a forming cavity in a prescribed forming die to form the blank for forging (S1), previous to the forging, the prescribed heat treatment is applied (S2) to the blank for forging to develop the blister in the blank caused by expansion of the internal gas therein.