| 摘要 |
PURPOSE:To maintain a constant temperature of resin filled in a cavity, by controlling a number of screw rotations and a screw back-pressure, which are found in a metering process, by means of the function of resin pressure detected in a filling process of a precedent molding cycle. CONSTITUTION:A screw 6 is moved forward as a result of acting the pressured oil controlled at an oil pressure circuit on an oil pressure cylinder 7, and detected values P1 to P3 of a pressure detectors 27 are stored at a detecting circuit 25 every time when values detected by a potentiometer 10 coincides with set value of detecting position setters 13 to 15. When a filling process is complete, the values are sent from the circuit 25 to a computing circuit 26 where an operation condition of a metering process, to which consideration on a temperature risen due to the pressures P1 to P3 of molten resin is given, is computed as the function of a resin pressure. The results are sent to a setter 18 or 20 as a control signal of a number of screw rotations and of a screw back-pressure. An electromagnetic proportional flow control valve 16 and an electromagnetic proportional pressure control valve 17 are worked by a signal from the setter 18, and thus, the number of screw rotations and the screw back-pressure are decided. |
