| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems of the decreasing tendency and fluctuation of the weight of a molding by avoiding the influence of pressure loss due to the viscosity of pressure oil by disturbance (temperature variation etc.) and its variation. SOLUTION: A controller of an injection molding machine is equipped with a VP change-over control function part Fc. The part Fc carries out: speed feedback control based on a speed detection value Vd obtained by converting a position detection value Xd obtained from a screw position sensor 4; pressure feedback control, based on a pressure detection value Pdb obtained from an injection pressure sensor 6b; a change-over from a speed control zone Zv to a pressure control zone Zp when the pressure deviation value Ep between a pressure set value Ps set at least in advance and the pressure detection value Pdb becomes a change-over determination value Eps set in advance or below; and a shift of a speed command value in the speed control zone Zv, after being controlled by a prescribed control pattern Dp, to the pressure control zone Zp during the change-over. COPYRIGHT: (C)2009,JPO&INPIT
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