The invention discloses a method for
casting a wear-resisting sand pump. In the wear-resisting sand pump, a pump
impeller, a material inlet and a pump body are precisely cast by a vacuum lost mold; a shaft is connected with the pump
impeller through an outer cone and an inner cone; and the outer cone and the inner cone are rectangular, prismatic or hexagonal and are fastened by screws. The precise
casting method comprises the following process steps of: 1, partitioning a foam material to obtain main parts, and bonding by using an adhesion agent to obtain an integrated model of which the shape is consistent with the main shape of a
casting; 2,
coating a
mica-based
coating onto the outer surface of a foam model, and
drying; 3, putting the dried foam model into a sand box, filling
dry sand into the sand box, and performing three-dimensional oscillation compaction; 4, vacuumizing the sand box by using a vacuum
system through negative pressure; 5, pouring molten metallic iron from the feeder head of the sand box to replace the position of a foam-molded model so as to obtain a corresponding main part of the sand pump; and 6, condensing. The wear-resisting sand pump has the characteristics of high casting quality,
high surface precision, high rigidity, high wear-resisting property, environment friendliness and the like, and is sanitary, safe and reliable.