| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that a great deal of effort is needed to find reasonable condition by trial and error, because of no indicating for setting operational condition of the pressure plunger suitable for each metal mold. SOLUTION: In this pressure casting method wherein the cavity of a metal mold is filled with molten metal and a pressure plunger advancing in the cavity pressurizes the molten metal, the operation starting time of the pressure plunger is made to be a time standard, the mold opening amounts changing with time are previously set as a target trajectory, and the pressurizing force of the plunger is feedback controlled so as to fall an actual mold opening amount in the set one. Since the mold opening amount of the target trajectory can uniquely be set as a pattern wherein it gradually increases after starting the advance of the plunger while changing linearly to reach a maximum amount and after that, keeps the maximum, no complicated trial and error is needed to set he operational condition of the pressure plunger.
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