Patent ID: 8307884
Filing Date: 2012-11-13
Classification: B22D

Abstract:
1. A die casting machine comprising: an injection electric servomotor; an injection hydraulic cylinder which has a piston; a ball screw mechanism which converts rotational motion of the injection electric servomotor into rectilinear motion and transmits the rectilinear motion to the injection hydraulic cylinder; and a control unit which controls driving of the injection electric servomotor and driving of the injection hydraulic cylinder so as to sequentially execute an injection step including a low-speed injection step and a high-speed injection step following the low-speed injection step, and a pressure intensification step following the injection step; the die casting machine being characterized in that: the control unit controls the driving of the injection electric servomotor and the driving of the injection hydraulic cylinder during execution of the injection step so that an addition speed of a forward speed of the piston moved in accordance with a rotational speed of the injection electric servomotor and a forward speed of the piston moved in accordance with the driving of the injection hydraulic cylinder can reach an intended speed of the piston.