| 摘要 |
PURPOSE:To prevent injection hydraulic pressure from changing over in the state that resin is not filled yet in a mold by setting a screw reaching the preset position when the pressure in a mold is controlled with injection hydraulic pressure and changing over the injection hydraulic pressure from high pressure to low pressure when the injection hydraulic pressure reaches the set value. CONSTITUTION:When a screw 1 moves forward are resin is filled in a mold 5, the resin fed into the mold 5 thereafter compresses the resin in the mold 5 to rise injection hydraulic pressure suddenly. When the injection hydraulic pressure rises up to the hydraulic pressure Pc set in a setting device 11 at the point D, a signal is transmitted from a comparison device 12 to a sequence controller 13. At that time, as the screw 1 already reaches the point D, the signal from a comparison device 15 is also transmitted to the sequence controller 13, and a signal is issued from the sequence controller 13 to an electromagnetic proportional pressure valve 8, and the set pressure of the electromagnetic proportional pressure valve 8 is changed over to low pressure Pk and the injection hydraulic pressure is also changed over to Pk. |
