Patent ID: 8168097
Filing Date: 2012-05-01
Classification: B29C

Abstract:
1. An injection molding machine provided with a hydraulic drive source incorporating a hydraulic pump that variably controls the number of rotations of a drive motor to achieve control of a discharge flow rate, the injection molding machine comprising: mode selection means that can selectively switch between a first control mode and a second control mode, wherein, in the first control mode, control is performed by a first control system in which a screw speed is controlled by feedback with a speed detection value that is detected by screw speed detection means and that is related to the screw speed and a speed target value that is set, and an injection pressure is controlled by feedback with a pressure detection value that is detected by injection pressure detection means and that is related to the injection pressure and a pressure target value that is set, whereas, in the second control mode, control is performed by a second control system in which the screw speed is open-loop controlled with a speed target value that is set, and a pump pressure is controlled by feedback with a pressure detection value that is detected by pump pressure detection means and that is related to the pump pressure of the hydraulic pump and a pressure target value that is set, wherein the injection molding machine is capable of operating in only one of the first and second control modes at any given time, wherein the first control mode is selected for a virgin material and the second control mode is selected for a recycled material.