Molten metal injection control of die-cast machine, involves controlling back pressure of injection cylinder and booster cylinder synchronously to execute injection and booster operation

摘要

The flow rate of hydraulic oil discharge path (16) of an injection cylinder (10) is adjusted by a control valve (17), continuously. The synchronous control of backing pressure of the injection cylinder and the booster cylinder (20) is carried out to execute injection and booster operation. The molten metal is discharged to the casting molding by a plunger (151) that is driven by a piston (15) of the injection cylinder. The booster of hydraulic oil supplied to injection cylinder is carried out by the booster cylinder that has a booster piston (25). An Independent claim is also included for molten metal injection controller.