ELECTRIC INJECTION MOLDING APPARATUS, AND INJECTION MOLDING METHOD USING THE ELECTRIC INJECTION MOLDING APPARATUS

摘要

PROBLEM TO BE SOLVED: To allow molding a stable resin product without quality fluctuation despite change in work environment, in injection molding using an electric injection molding apparatus.;SOLUTION: The invention relates to an electric injection molding apparatus which injects and fills up a resin material, supplied to an injection cylinder, into dies 1 and 2, by back and forth driving an injection screw 23 equipped in the injection cylinder using a motor 29A. A control means 50A, which speed controls the motor 29A when filling the resin material in dies 1 and 2 and pressure controls the motor 29A when compensating post-filling resin contraction, is switched from speed control to pressure control, when pressure in dies 1 and 2 detected or presumed by an internal pressure detector reaches a predetermined pressure. This brings the pressure in the die, to a smooth and continuous state, thereafter to a gradually increasing condition, then to a raised medium-pressure state, and further to a gradual decrease afterward.;COPYRIGHT: (C)2006,JPO&NCIPI