The invention relates to a method for
casting an air sucking valve
steel casting part. The method comprises the steps (1) using central cross sections of
flange holes on two sides of the
casting part as parting surfaces, manufacturing a
metal mold, using water glass
quartz sand to manufacture an upper portion and a lower portion, using water glass limestone sand as back sand, using the water glass
quartz sand as facing sand to manufacture sand cores and brushing
zircon power coatings on the surfaces of the upper portion, the lower portion and the sand cores; (2) placing the sand cores into a cavity of the lower portion, placing outer cold irons on
flange end faces of the lower portion, placing open risers and riser pads on the upper portion, placing second outer cold irons on two end faces of an inner
flange of the lower portion, correspondingly placing blind risers and riser pads on the upper portion, placing inner cold irons at the valve rod hole positions of a second sand core and a fourth sand core and leading a straight pouring channel and a horizontal pouring channel of a pouring
system into flange edges on two sides at the parting surface positions; (3) assembling the mold after the cores fall; (4)
smelting furnace burden and pouring the
casting part; and (5) performing cooling, mold opening and core falling to clean the casting part. By means of the method for casting the air sucking valve
steel casting part, casting part cracks can be decreased, an internal structural of the casting part is compact, and the rate of finished products is high.