Hybrid core driving device and molding machine

A molding machine comprising:

• a base;
• a fixed die plate fixed onto the base and holding a fixed die;
• a movable die plate provided on the base to be movable in a mold opening and closing direction and holding a movable die to face the fixed die;
• a hybrid core driving device driving a core to be combined with the fixed die and the movable die;
• a mold clamping device clamping the fixed die and the movable die;
• an injection device filling a molten material into a cavity formed by the fixed die, the movable die, and the core;
• and
• a control circuit controlling an operation of the hybrid core driving device,
• wherein the hybrid core driving device includes:
• a cylinder tube,
• a first cover member fixed to one end of the cylinder tube,
• a second cover member fixed to the another end of the cylinder tube,
• a rod provided in the cylinder tube, at least a part of the rod provided in the cylinder tube, the rod having a connecting portion provided at one end to be connectable to the core, the rod having an annular flange provided on a side of the second cover member in relation to the connecting portion, the rod penetrating the first cover member, and the rod configured to move straight with respect to the cylinder tube,
• a nut fixed to the rod,
• a screw shaft penetrating the second cover member and the nut, the screw shaft provided to be insertable into the rod and to be rotatable,
• a motor rotating the screw shaft,
• an annular piston provided in the cylinder tube, the rod penetrating through the annular piston, and the annular piston slidable with respect to the cylinder tube and the rod, and
• a connection portion provided at the cylinder tube, the connection portion being connectable to a pipe supplying a hydraulic liquid operating the piston, the pipe configured to supply the hydraulic liquid to a region surrounded by the cylinder tube, the first cover member, and the piston.