Patent ID: 9676025
Date: 2017-06-13
CPC Classifications: B22D

Claim:
1. A low-pressure casting apparatus comprising: a casting die having inside a cavity shaped to conform to an outer shape of a casting; a holding furnace provided below the casting die which heats and holds molten metal; and a guiding unit which guides the molten metal inside the holding furnace into the cavity, the low-pressure casting apparatus which fills the cavity with the molten metal through the guiding unit by introducing gas into the holding furnace to apply pressure to a surface of the molten metal, wherein the holding furnace includes a metal casing, a furnace body accommodated in the metal casing, and a refractory layer disposed between the metal casing and the furnace body, the refractory layer having a pore structure, and the low-pressure casting apparatus is provided with a first gas supply unit which supplies to the furnace body the gas to apply pressure to the molten metal and a second gas supply unit which supplies gas to the refractory layer.