| 摘要 |
PURPOSE:To maintain a given molding pressure by orderly retracting plungers for pots filled with greater amounts of synthetic resin even when the amounts of the synthetic resin packed into the pots are uneven. CONSTITUTION:Plungers 5 to cast a synthetic resin are pushed up to a limiting upper position, and then a synthetic resin is packed into pots 4. Top force 1 and a bottom force 2 are clamped together. A liquid-pressure cylinder device 10 is operated, a press frame 11 is moved upwards, a plunger holding frame 6 is pushed down toward the bottom force 2, and synthetic resin 3 in the pots 4 are cast into molds. As the plunger holding frame 6 makes pushing movements, the mold pushing forces to be loaded on the plungers orderly from the pots having greater amounts of synthetic resin reach given molding pressures and thereby the plungers reaching given molding pressures are orderly retracted to discharge back-pressure liquid into a tank through a pressure governor valve 9, so that the pressure of the back-pressure liquid is kept at its initial set pressure and also the casting speed of synthetic resin by the liquid-pressure cylinder 10 can be kept constant.
|
