| 摘要 |
PURPOSE:To obtain a good quality product having a little blow hole by constituting the titled apparatus wherein a molten metal is detected directly by an electrode sensor and an insulation valve is shut, thereby causing no loss time and preventing surely molten metal from flowing into a pressure reducing series. CONSTITUTION:By start of an operation for the vacuum device 35 at the same time with start of an injection for the molten metal 16, air in the cavity 8 is sucked from a path between an opened valve body 31b and valve seat 18c through a valve hole 18a, exhaust hole 18b and pressure reduced path 34, and the cavity 8 is evacuated thereby. Just before filling up by the molten metal 16 in the cavity 8, the molten metal 16 is come in a runner 33 and is brought into contact with a top of the electrode sensor 36 to energize a coil 23. Then, by shifting of a movable iron core 24, the isolation valve 31 is shifted and the valve body 31b shuts the valve seat 18c to prevent the molten metal 16 from flowing into the pressure reduced path 34 side. Further until the time just before filling-up of the molten metal is completed, high degree of reduced pressure in the cavity 8 is kept, and this is no loss time between detection of filling-up time for the molten metal 16 by the sensor 36 and shutting time of the isolation valve 31.
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