METHOD FOR PRODUCING ALUMINUM PRODUCT

PROBLEM TO BE SOLVED: To provide a method for producing an aluminum product with which the product having large difference between the thick part and the thin part can accurately be forged at low cost. SOLUTION: This method for producing the aluminum product includes: a blank process in which a continuously cast material composed of the aluminum alloy cast into the cross sectional shape having the similar shape to a plane projection of the finish product, is cut off at a right angle to a casting direction and in a prescribed thickness to obtain a plate-like blank W1 for forging having the above cross sectional shape; and a hot closed forging process in which the heated blank W1 for forging is inserted into a cavity 18 resembled in the above cross sectional shape of the product in a recessed die (lower die) 16 and the closed forging method for pressing a projecting die 14 resembled in the cross sectional shape of an upper die 12 to such cavity 18, is applied to make the volume of the thick part 4a corresponding to the thick part of the finish product in the obtained intermediate blank W2 larger by 1.1 times or more than the volume of the thick part of the finish product. COPYRIGHT: (C)2004,JPO