| 摘要 |
Provided is an electric die casting machine capable of achieving high injection speed and high boost pressure. An injection unit (100) is provided with an electric servomotor (104) for injection in a first stage, a ball screw mechanism (110) (motion converting mechanism in the first stage) for converting rotational motion of the electric servomotor for injection in the first stage into rectilinear motion of a linear motion body (106), electric servomotors (111 and 112) for injection in a second stage, mounted on the linear motion body, a crank mechanism (113 and 116) (motion converting mechanism in the second stage) for converting rotational motion of the electric motor servomotor for injection in the second stage into rectilinear motion of an injection plunger (118), and a control unit (400) for controlling driving of each electric servomotor for injection. The control unit drives only the electric servomotor (104) for injection in the first stage independently in a low-speed injection step, and drives both the electric servomotor (104) for injection in the first stage and the electric servomotors (111 and 112) for injection in the second stage simultaneously in a high-speed injection step and a pressure intensification step.
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