High vacuum die-casting method in which sealed space vacuumizing step is started prior to cavity vacuumizing step

摘要

The invention particularly relates to a high-vacuum die-casting method, the product is molten metal into a space in the cavity to be formed while the injection, it relates to the interior of the gas in the cavity to a high vacuum die casting method that can be effectively discharged. According to the vacuum die casting method according to the invention, before starting the evacuation of the gas in the cavity, starting the evacuation of the eject plate and the end portions of the ejection pins, the gas in the closed space formed by sealing the first space is arranged by that Since a large amount of gas in the sealed space put to discharge to the outside in advance, the possibility that gas is introduced into the cavity in the closed space is greatly reduced, and the burden of the vacuum tank for''ll cavity for vacuum suction of the gas in the cavity, and result, even if a vacuum tank of a relatively small capacity as a vacuum tank for the cavity, the gas in the cavity can be discharged efficiently.