| 摘要 |
PURPOSE:To mold skillfully the molding material having high fluidity such as that of liquid resin by utilizing as an injection force, the difference between the forces operated on a ram by the pressurized oil flowing into a rear oil chamber and the pressurized oil flowing out of a front oil chamber. CONSTITUTION:The pressurized oil from an oil source 30 is supplied into a rear oil chamber SR, changing a switch valve 33 into (b) side and changing a switch valve 331 into (a) side. The oil in a front oil chamber SF is caused to flow into a tank by a pressure regulating valve 6 only when the oil pressure in the front oil chamber SF is caused to be equal to its set pressure or higher, closing a check valve 36. The pressure in the front oil chamber SF during flowing out is kept at the set pressure of the regulating valve 6. Thus, when the pressure in the rear oil chamber SR is elevated and accordingly the pressure in the front oil chamber SF is elevated, and then they exceed the set pressure of the regulating valve 6, a ram 3 is advanced, whereby a screw 10 is advanced and the molding material measured and accumulated at the front of the screw 10 is injected and packed into the cavity 43 of a mold 40. Thus, the injection process is achieved. |
