METHOD AND APPARATUS FOR DISPLAYING INJECTION RESIN PRESSURE IN ELECTROMOTIVE INJECTION MOLDING MACHINE

摘要

PROBLEM TO BE SOLVED: To eliminate a high hair like waveform appearing at a time of the start of injection for the sake of the moment of inertia of the whole of an injection mechanism to display only necessary injection resin pressure by displaying the waveform of the load torque of an electromotor obtained by a specific formula when injection resin pressure is displayed. SOLUTION: The torque current (i) of an electromotor 1 at a time of injection is operated on the basis of the signal detected by a current sensor 15 by a control unit 11. The angular velocityωof the electromotor 1 at this time is operated on the basis of the signal related to the rotational speed detected by a position sensor 13 by the control unit 11. The control unit 11 operates the load torque TL of the electromotor 1 on the basis of the operated torque current (i) and angular velocityωof the electromotor 1, a torque constant K and the moment of inertia of the whole of an injection molding machine according to formula TL=i'Kr-J.dω/dt to output the same to a display device 14. A displayed state is shown as a waveform S on the display device 14.