| 摘要 |
PURPOSE:To control an injection speed swiftly and accurately without having a lag in response in a changing part at the time of building-up and falling of the injection speed, by a method wherein an opening area of a nozzle valve is controlled to a preset opening prior to the control of a supply oil quantity to an extension chamber of an injection cylinder. CONSTITUTION:A screw 2 is connected with a piston rod 8 of an injection cylinder 7, a driving shaft 10 is fitted into the piston rod 8, hydraulic oil of a hydraulic pressure source 12 is supplied within an extension chamber 11 and a flow of the hydraulic oil is controlled by a flow control valve 13. A nozzle 4 is provided with a nozzle valve 14 which controls an injection speed by changing an opening of the nozzle valve 14 by controlling an electric current to be supplied to a proportional solenoid 17. When the screw 2 has attained to a preset screw position, an opening area of the nozzle 4 is controlled to a preset opening. A supply flow into the extension chamber 11 of the injection cylinder 7 is controlled to a preset value prior to becoming of the opening area of the nozzle 4 to the preset opening. Therefore, the injection speed can be changed swiftly without having a lag in response, in a changing part between building-up and falling of the injection speed.
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