| 摘要 |
PURPOSE:To make the controlling of injection oil pressure possible so as to let the resin pressure to trace the in-mold pressure waveform, which is regenerated by the memorized in-mold pressure waveform, as the target by a method wherein the in-mold pressure waveform, under which a conforming article is produced when the molding is performed by employing multi-stage programmed injection during the injection and dwelling under hydraulic control, is stored in a memory in a control to control the injection oil pressure by means of the resin pressure. CONSTITUTION:PID operation is performed during the dwelling process at an in-mold pressure servo controller 12 on the deviation of an in-mold pressure signal (the detected value of an in-mold pressure sensor 2) during molding from the signal of the in-mold pressure waveform, which is memorized in a digital in-mold pressure waveform memory 15 as the target value in order to continuously set the oil pressure to be set at that time point and the control signal for setting is sent through change-over switches 14 and 16 to a hydraulic pressure servo controller 17. PID operation is performed at the controller 17 on the deviation of the hydraulic pressure signal sent from a hydraulic pressure sensor 6 from the set value sent from the in-mold pressure servo controller 12 so as to send the result through a servo amplifier 9 to a change-over switch 10 in order to drive a servo valve 8 for controlling the oil pressure.
|
