FINISH METHOD FOR ALUMINUM DIE-CAST TRUNK AXLE CASE AND ALUMINUM DIE-CAST TRUNK AXLE CASE

摘要

PROBLEM TO BE SOLVED: To ensure sufficient hydraulic fluid sealing property even if an aluminum die-cast trunk axle case has a complicated shape. ;SOLUTION: After a cast trunk axle case is stripped from a die and is water- cooled for a predetermined time, a planned part is folded and removed by a trimming press, and a large burr is removed by filling. Next, a projection material made of zinc or zinc alloy having average particle diameter of 0.3 mm or more and 1 mm or less is projected on a whole surface by a shot blast device to remove a small burr, and a projection material having the same specification as the above-mentioned projection material is sprayed on a section in which a hydraulic circuit is formed by an air blast device to seal minute communicating holes. Then, a core ping part is washed by water and remaining projection material is washed, and then dimensions of an mating face and a fitting face are obtained by cutting and grinding machining.;COPYRIGHT: (C)2000,JPO