| 摘要 |
PURPOSE: To provide a method for controlling the speed of an injection molding machine wherein adverse effect to be caused by fluctuation of closing characteristics of a check valve in the injection filling process is minimized, and the quality of a molded item is stabilized. CONSTITUTION: In an injection molding machine provided with an injection- controlling apparatus wherein the position of an injection screw, the injection pressure and the resin temp. detected respectively by means of a position detector, a pressure detector and a resin temp. sensor are input and speed controlling is performed by a plurality of steps of injection speed in the filling process, when the injection pressure reaches the check valve judging pressure PJ set at an arbitrary point of the filling process in advance, the difference▵S1 (or▵S2 ) between the injection screw position and the injection screw position in the reference shot is operated and stored. Then, in each changing and switching of the speed after setting the judging pressure PJ, a modification is added to each reference changing and switching position mn , mn+1 , mn+2 ,... and speed switching is performed by position switching.
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