EJECTING SYSTEM OF DIECAST MACHINE AND MOLDING METHOD CHARACTERISTIC OF REACHING TO REQUIRED CASTING PRESSURE WITHOUT PERFORMING ADJUSTING OPERATION OF ACCUMULATOR SIDE

摘要

PURPOSE: To provide an ejecting system of diecast machine and a molding method that are capable of obtaining required casting pressure without performing adjusting operation of the accumulator side even in a case that it is necessary to change casting pressure finally outputted by the ejection system due to exchange of dies or change of casting conditions. CONSTITUTION: In an ejecting system(1) of diecast machine in which an injection plunger(64) is advanced to eject and fill molten metal(ML) into a cavity formed by dies(61,62), and which casts the molten metal by increasing casting pressure of the molten metal which is filled in the cavity, the ejecting system of diecast machine includes an ejection piston(5) connected to the ejection plunger; an ejection cylinder(2) in which a pressure increasing piston(6) arranged in the rear of the ejection piston is installed; an accumulator(20) for supplying an operating liquid having a certain pressure; a liquid pressure circuit for driving the pressure increasing piston after driving the ejection piston by supplying the operating liquid to the ejection cylinder from the accumulator; a control valve(15) which is to control speed of the ejection piston by regulating flow rate of the operating liquid discharged from the front side of the ejection piston of the ejection cylinder; and a control means for determining a final value of the casting pressure by regulating pressure of the operating liquid at the front side of the ejection piston by timing for closing the control valve.