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AssigneeMitsubishi Heavy Industries Plastic Technology Co., Ltd.
InventorsMasaaki Ikarashi, Mamoru Kawasaki, Takehiro Irie, Toshihiko Kariya
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A mold-clamping device includes a fixed mold plate including a fixed mold; a movable mold plate including a movable mold; a hydraulic cylinder allowing the movable mold plate to approach or be separated from the fixed mold plate; a hydraulic pressure supply source supplying a hydraulic fluid to the hydraulic cylinder; and a control unit performing driving control on the hydraulic pressure supply source. The control unit includes a flow rate decrease control unit for deceleration for decreasing a flow rate of the hydraulic fluid according to a deceleration gradient set in advance when a movement of the movable mold plate is decelerated according to the deceleration gradient, and a flow rate increase control unit for controlling the flow rate of the hydraulic fluid to increase when the flow rate of the hydraulic fluid is decreased according to the deceleration gradient by the flow rate decrease control unit.
A mold-clamping device comprising:
A method for opening and closing a mold for a mold-clamping device including a fixed mold plate having a fixed mold, a movable mold plate having a movable mold, and a hydraulic cylinder allowing the movable mold plate to approach or be separated from the fixed mold plate, the method comprising a flow rate increase step for increasing a flow rate of a hydraulic fluid supplied to the hydraulic cylinder when the movable mold plate is decelerated in a case where a pressure in the hydraulic cylinder is determined to be lower than a predetermined positive pressure lower than a minimum driving pressure of the hydraulic cylinder or a speed of the hydraulic cylinder is determined to exceed a predetermined speed gradient set in advance by a predetermined amount or by a predetermined ratio.
Dependencies are inferred from the claim text.