Patent ID: 8191608

Claim:
A device for low-pressure casting where molten metal is supplied in a mold, the device comprising: a mold, a stalk suspended from a gate for filling of the mold or a guiding tube connected at one end to the gate for filling the mold with molten metal by pressurizing molten metal with inert gas: a room for holding molten metal; a pressurizing room that communicates with the room for holding molten metal through a hole for communication, wherein a bottom end of the stalk is located in the pressurizing room, or an opposite end of the guiding tube is connected to the pressurizing room; an on-off valve for opening and closing the hole for communication, the on-off valve when open permitting molten metal to be supplied from the room for holding molten metal to the pressurizing room through the hole for communication and permitting molten metal in the pressurizing room to be returned to the room for holding molten metal through the hole for communication; a sensing means for sensing that a space over the molten metal in the pressurizing room communicates with the stalk or the guiding tube; and a means for supplying inert gas to an upper part of the pressurizing room to pressurize a surface of the molten metal in the pressurizing room and cause the molten metal to flow into the stalk or guiding tube and fill the mold.