耐熱Mg合金用新半凝固射出成形プロセスの研究(第二報) : 新型200ton型締め力半凝固射出成形機の試作と最適成形条件

概要

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Based on the experiment result of semi-solid injection molding machine which has the mold clamp force of 20 ton^f reported previously, the trial model with the mold clamp force of 200 ton^f was designed and then was manufactured. By using this trial model, the accuracy of the control method of semi-solid temperature zone was verified, and it was checked that a solid phase rate could fabricate at least 30%. As the result of the trial test by same molding conditions, it was clarified that mobility differed by the molten state and the semi-solid one. And it was checked that there were many merits by comparing this new semi-solid injection molding process with the conventional die casting. In order to verify this new process, trial production molding of the clutch piston which was a main part of a car was carried out. At this time, in order to obtain the clutch piston without defect, an experimental design was used. Durability was evaluated using the equipment which allowed repeated load on a clutch piston without a defect. As a result, trial production parts were inferior to the conventional parts made from aluminum alloy. In order to conquer this problem, it turned out that the part shape which was suitable for the Magnesium alloy of low rigidity compared with the aluminum alloy needs to be designed.