Abstract A method and device for keeping metal mold in a clamped state characterized in that the mold-halves of the metal mold are respectively coupled to a plurality of hydraulic cylinders and pistons, the mold-halves are forced to close so that the displacement of the pistons causes a hydraulic fluid to flow from one space to the other in the hydraulic cylinders and also to an accumulator through a control valve, and upon the completion of the closure, shifting the control valve to another position so that the remaining fluid in the above mentioned one space is further evacuated to another accumulator at a low pressure with the simultaneous communication maintained between the other space of the hydraulic cylinders and the first accumulator, whereby a pressure difference is created between the two spaces separated by the pistons, and the mold-halves are thereby clamped.
A method for keeping metal mold in a clamped state during filling comprising the steps of preparing a plurality of hydraulic cylinders and pistons respectively coupled to the moldhalves, forcing to close said mold-halves so that the displacement of the pistons causes the hydraulic fluid to flow from one space to the other in said hydraulic cylinders and also to an accumulator through a control valve meanS, and shifting said control valve means to another position at the completion of the closure of the mold-halves so that the remaining fluid in said one space is further evacuated to another accumulator at a low pressure with the simultaneous communication maintained between the other space of the hydraulic cylinders and the first accumulator, whereby a pressure difference is created between the spaces separated by the pistons in said hydraulic cylinders, and the mold-halves are thereby clamped, and then filling the mold.
Claim 2
Independent Claim
149 words
A method for keeping metal mold in a clamped state during filling comprising the steps of preparing a plurality of hydraulic cylinders and pistons respectively coupled to the moldhalves, forcing to close said mold-halves so that the displacement of the pistons causes the hydraulic fluid to flow from one space to the other in said hydraulic cylinders and also to an accumulator through a control valve meanS, and shifting said control valve means to another position at the completion of the closure of the mold-halves so that the remaining fluid in said one space is further evacuated to another accumulator at a low pressure with the simultaneous communication maintained between the other space of the hydraulic cylinders and the first accumulator, whereby a pressure difference is created between the spaces separated by the pistons in said hydraulic cylinders, and the mold-halves are thereby clamped, and then filling the mold.