Shell molding refers to a method of molding a hard thin shell with a thickness of 6-12.5mm by contacting resin sand with metal preheated to 150-350 ° C to form a cavity consistent with the contour of the mold
①The casting has high dimensional accuracy and small machining allowance.
② The surface of the casting is smooth and clean.
③ Can cast thin-walled castings.
④ Casting scrap rate is low.
⑤ Improved productivity
① Use metal molds, consume more energy, add more resin, and cost more.
② The sand mixing process is more complicated.
③ The cost is high and it is not suitable for casting large pieces.