Importance

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Abstract

The method having a clamping cylinder which slidably fits a clamping ram whose front end is fixed on a movable board of an injection molding machine, etc., an inner space of the clamping cylinder divided into a rear chamber W and a front chamber X by a large-diameter piston section of the clamping ram, an inner rear wall of the clamping cylinder having a mold opening piston fixed thereto having a front end slidably fit in the clamping ram from the rear, an inner space of the clamping ram being divided into a chamber Y and a chamber Z opening to the atmosphere by the large-diameter piston section of the opening piston, a hydraulic controlling device which connects the chambers X, Y and Z to an oil pressure source and connects the chambers X and Y to the chamber W for a high-speed mold closure, which connects the chamber W to the oil pressure source and relieves the pressure in the chambers X and Y for a tight clamping, and which connects the chamber Y to the oil pressure source and connects the chamber W to both the chamber X and the oil tank for opening the mold, the effective pressure receiving area of the chamber Y being preferably designed to be equal to the cross-sectional area of the cylindrical section of the clamping ram.

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First Claim