PURPOSE: To prevent a mold from generating a damage or flashes by injecting by the optimum pressure, by a method wherein when present injection pressure acting upon a screw exceeds a control value set up beforehand by corresponding to a present position of the screw, a servomotor is controlled by a current command value obtained by deducting a fixed quantity from the current com mand value obtained by a speed loop control.
CONSTITUTION: Screw positions Si, Si+1 are read into a servo CPU 20 from a control value memory file of a nonvolatile memory 24 based on a value of an address reference index i. While a present value P of injection pressure is read through a bus 22 and pressure monitoring CPU 17, a speed loop processing is performed based on a speed command VC calculated through processing of a position loop and a measured speed Vf and a current command (torque command) I is obtained. Then a control value Pk corresponding to a value of a register k is read through the control value memory file, when the present value P exceeds the control value Pk, corrective operation wherein a fixed value is deducted from the current command value I is performed and the value is taken as the current command value I of the current loop.
| JP3172142 | VERTICAL INJECTION MOLDING MACHINE |
| WO/2012/154716 | SELECTIVE ADJUSTMENT OF POSITION OF NOZZLE ASSEMBLY |
NEKO TETSUAKI
SENDA KOJI
