| 摘要 |
PURPOSE:To realize the injection with proper speed by a method wherein the controlling of injection speed is performed in accordance with the injection speeds and positions of a screw at changing-over in the respective stages, all of which are memorized in a memory throughout a process from the start to the finishing position of injection. CONSTITUTION:The points of changing-over and injection speeds in the respective stages are memorized in a non-volatile memory 14. When an injection molder is put in its injection process, a central processing unit 11 sets the counter (n) for the number of injection stage is set to 1. Injection speed data Vn of the stage, the number of which corresponds to the value in the counter (n), are read out of the memory 14 so as to output the corresponding speed instruction voltage from a speed instruction voltage generating circuit 15 to a servo circuit 2 in order to drive a servo motor M at the speed Vn. Next, the final position Xn of a screw is read out of the memory. The existing position (x) of the screw is read out of a counter 16 in order to compare it with the injection completion position xe. When the existing position (x) reaches the final position xn of the existing stage, 1 is added to the counter (n). When the position of the screw reaches the position xe, the injection controlling action ends. Thus, the changing-over of infection speeds is done precisely. |
