| 摘要 |
PURPOSE:To make it possible to always perform efficient preparatory running in a short time by a method wherein controlled amounts are increased stepwise by a preset set amount so as to reach the final controlled amounts, which correspond to the molding conditions in normal molding running, by the preset number of times of increase and at least one trial injection molding operation is done at every increase of respective controlled amounts. CONSTITUTION:A control device 24 calculates metering stroke S, the rotational speed Vr of a screw 12 and backpressure Pb at every trial shot in preparatory running on the basis of the final controlled amount S0 of the metering stroke S, the final controlled amount Vr0 of the rotational speed Vr of the screw 12 and the final controlled amount Pb0 of the backpressure Pb so as to perform a plasticizing and metering operation at every trial shot in preparatory running in accordance with the respective calculated controlled amounts. In addition, the control device 24 calculates injection speed Vi, injection keeping pressure Pk and keeping time Tk at every trial shot on the basis of the final controlled amount Vi0 of the injection speed Vi, the final controlled amount Pk0 of the injection keeping pressure Pk and the final controlled amount Tk0 of the dwell time Tk so as to perform every trial injection operation in preparatory running in accordance with the respective calculated controlled amounts. |
