INJECTION MOLDING CONTROLLING METHOD FOR INJECTION MOLDING MACHINE

摘要

The clamping speed and the injection start timing T are so adjusted that the sum SIGMA P of resin pressures acting on parting surfaces of a mold cavity does not exceed the clamping force F outputted at that point of time, and the clamping and the injection of the injection molding machine are simultaneously effected. The injection is started in the time from mold touching to completion of clamping, during which the clamping force F is weak. The gas in the mold cavity easily escapes therefrom even if any gas vent is not formed in the mold, and insufficient filling with resin and yellowing of resin are prevented. Further, since the clamping and injection are simultaneously effected, the total period of time required for clamping and injection is shortened by T' whereby the molding cycle is speeded up.