| 摘要 |
[Subject] Through transmitting nonflammable gas into the cavity, the impure gas inside the cavity will be discharged. High quality die will be produced by using the solution as following. [Solution] According to the present invention, a valve type gas venting device is connected to a mold which has a cavity when it is closed. Sleeve connected with a molten metal supplying inlet and a plunger which pushes molten metal. A suction path connects with a vacuum tank and a gas transmitting path connects with a gas source. Both of them are connected to the valve type gas venting device which has a switchable function. Nonflammable gas is transmitted into the cavity from the gas source via the gas venting device. The time slot is from the time just before the completion of mold clamping to the time before filling the molten metal into the cavity The impure gas inside the cavity will be discharged from the inlet of molten metal by transmitting nonflammable gas consistently. The nonflammable gas will be discharged from the gas venting device during the filling of the molten metal.
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