| 摘要 |
A mold clamping apparatus in which hydraulic oil that is forcibly discharged into hydraulic lines from one of two kinds of cylinders, that is, a differential mold clamping cylinder and a mold clamping oil chamber of a mold opening/closing cylinder, is, in an alternating manner, provided to the other cylinder as its operating oil. This feature enables the simultaneous operation of the two kinds of cylinders as well as reduction in operating time in which the mold is opened or closed. The mold clamping apparatus includes a stationary mold, a movable mold which closes with respect to the stationary mold, a core movable through the movable mold into and out of the stationary mold. The movement of the core into and out of the stationary mold is effected by a differential mold clamping cylinder which is separate from a mold opening/closing cylinder for the movable mold and is fitted with a booster ram. A hydraulic line on the mold opening side of the mold opening/closing cylinder and a hydraulic line for the differential mold clamping cylinder are interconnected to one another via a communication passage with a pressure/flow control valve disposed thereon. While the movable mold is opened and closed and the core is moved into and out of the stationary mold, a volume of hydraulic oil that is discharged into these hydraulic lines is alternately provided to the mold opening oil chamber or to the differential mold clamping cylinder.
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