Electric Die Casting Machine

摘要

In order to reduce the size and weight of an electric die casting machine and make it possible to perform predetermined injection operation and intensification operation without the necessity of controlling the ON and OFF operation of a clutch for supplying motive power, the electric die casting machine is provided with: a screw shaft (5) which is held rotatably, a nut body (7) which is threadably mounted on the screw shaft (5) so as to be able to move forward and backward, an injection plunger (9) which moves forward and backward in conjunction with the forward and backward movement of the nut body (7); an injection electric servo motor (10) and an intensification electric servo motor (11) which drive and rotate the screw shaft (5); and a one-way clutch (12) which is disposed between the screw shaft (5) and the intensification electric servo motor (11), wherein: the intensification electric servo motor (11) is started up during deceleration control of the injection electric servo motor (10) in a high-speed injection step, and the torque of the intensification electric servo motor (11) is transmitted to the screw shaft (5) via the one-way clutch (12) so that an intensification step can be performed following the injection step.

主权项

1. An electric die casting machine, comprising:
a screw shaft which is held rotatably; a nut body which is threadably mounted on the screw shaft to be able to move forward and backward; an injection plunger which moves forward and backward in conjunction with the forward and backward movement of the nut body; an injection electric servo motor and an intensification electric servo motor which drive and rotate the screw shaft; a one-way clutch which is provided between the screw shaft and the pressure-boosting electric servo motor; and a controller which controls the drive of the injection electric servo motor and the intensification electric servo motor; wherein: the one-way clutch is attached so that, when the screw shaft is driven and rotated in a direction to drive and move forward the injection plunger, the one-way clutch can rotate idly if the rotation speed of the screw shaft driven and rotated by the injection electric servo motor is higher than the rotation speed of the screw shaft driven and rotated by the pressure-boosting electric servomotor, and the one-way clutch can transmit the torque of the pressure-boosting electric servo motor to the screw shaft if the rotation speed of the screw shaft driven and rotated by the injection electric servo motor is lower than the rotation speed of the screw shaft driven and rotated by the pressure-boosting electric servo motor; and the controller controls the drive of the injection electric servomotor in accordance with a predetermined drive condition to execute a low-speed injection step and a high-speed injection step in an injection step, and starts up the intensification electric servo motor during deceleration control of the injection electric servo motor in the high-speed injection step or before the start of the deceleration control to execute an intensification step following the injection step.