A low-
pressure casting device for aluminum
alloy wheels of an automobile is composed of a low-
pressure casting system control cabinet, a pressurization air inlet tube, a pressure relief air outlet tube, a molten aluminum heat preservation furnace, an iron
sprue, a
ceramic heat preservation cup, a molten aluminum lifting tube, a heat
insulation layer, twelve to sixteen buffer holes and a
ceramic filter net. The two ends of the pressurization air inlet tube and the two ends of the pressure relief air outlet tube are connected with the low-
pressure casting system control cabinet and the molten aluminum heat preservation furnace. A
pressure control valve is installed in the low-pressure
casting system control cabinet and arranged at the end of the pressure relief air outlet tube. A pressure relief zero return button and a cumulative number zero clearing button are arranged in the low-pressure
casting system control cabinet. The iron
sprue is assembled at a die feed inlet, the
ceramic heat preservation cup is assembled under the iron
sprue, the molten aluminum lifting tube is assembled in the molten aluminum heat preservation furnace, the upper end of the molten aluminum lifting tube is provided with the heat
insulation layer, the inner
diameter of the part, immerged in molten aluminum, of the lower end of the molten aluminum lifting tube is greater than that of the upper end, the buffer holes with the
diameter of 10-12mm are formed in the lower end of the molten aluminum lifting tube, and the included angle formed between each buffer hole and the
vertical plane ranges from 15 degrees to 20 degrees. The low-pressure
casting device for the aluminum
alloy wheels of the automobile can remarkably reduce the burning loss, the heat loss, needle holes and
slag holes.