Kabushiki Kaisha Meiki Seisakusho

Yasuhiro Yabuki

Keijiro Oka

Shoji Okado

The electric injection molding machine comprises a sensorservo motora motorand a controllerand, in a plasticizing process in which the motoris rotated, the controllerperforms control by repeating a first process in which the rotation of the servo motoris controlled by a first retreating speed command valueto make the screwretreat at a low speed when a screw backpressure signal is smaller than a backpressure set valueand a second process in which the rotation of the servo motoris controlled by a second retreating speed command valueto make the screwretreat at a high speed when the screw backpressure signal is larger than the backpressure set value

Screw backpressure controlling method in electric injection molding machine

Disclosed is a compression molding method comprising the steps of: calculating an average value of mold clamping forces sensed in a plurality of mold clamping mechanisms for clamping a stationary and a movable mold half; obtaining a first control signal on the basis of deviation between a preset target mold clamping force and an average value of sensed mold clamping forces; sensing positions of movable members of the mold clamping mechanisms; obtaining an average value of sensed positions; setting the average value as a successive target position; obtaining a second control signal on the basis of deviation between each of the sensed positions and the successive target position; and obtaining a clamping control signal for each of the clamping mechanisms by adding the first control signal and the second control signal. An apparatus suitable for implementing the method is also disclosed.

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Aichi-ken, Japan

Yasuhiro Yabuki