| 摘要 |
PURPOSE:To prevent damage to a wire and the generation of bubbles in a mold by varying the plunger speed by multiple stages or steplessly during the injection of a resin to allow a delay in the speed at which the resin is injected into an end cavity. CONSTITUTION:As a plunger 14 lowers, hydraulic opening/closing valves (a)-(c) starts to work sequentially receiving signals to operate speed control valves 1-4 sequentially, from which a speed control signal is transmitted to a cylinder 15 to control the speed of the plunger 14. The plunger 14 starts to drive at the speed S0. After the time t1 elapses, the transfer speed is shifted down to S1 and the injection of a resin is started. Then, after the time t2 elapses, the transfer speed is shifted to S2 to start the filling for the runner section. After the time t3 elapses, the transfer speed is shifted to S3 to start the filling for the central cavity. After the time t4 elapses, the end cavity is filled further reducing the transfer speed to S4. |
