Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1997-10-09
1999-05-25
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 407, 2643281, 425145, 425150, 36447505, B29C 4577
Patent
active
059067780
ABSTRACT:
A servo valve is connected to a hydraulic cylinder for driving a movable body for shifting. A control signal is applied from a controller to the servo motor for controlling speed of the movable body in an injection molding machine. Control is performed in such a manner that open-loop control of a speed is performed by applying a control signal on the basis of a speed command value to the servo motor in a shifting zone of the movable body including an acceleration region. Closed-loop control is performed by applying a control signal (derived on the basis of a deviation between a speed detection valve and speed command value), to the servo valve in a shifting zone of the movable body including a decelerating region. By such a control method, in which the shifting zone including the accelerating region and the shifting zone including the decelerating region are separated, stability of control, necessary response characteristics, and precision can be maintained in a shifting range.
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Arai Tsuyoshi
Yamazaki Takayu
Heitbrink Jill L.
Nissei Plastic Industrial Co. Ltd
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