Shell mold casting, a casting method for producing castings with thin shell mold. A kind of molding sand (phenolic resin coated sand) hardened by heat is covered on the metal formwork heated to 180 ~ 280 ℃ to harden it into a thin shell (the thickness of the thin shell is generally 6 ~ 12 mm), and then heat and solidify the thin shell to achieve sufficient strength and stiffness. Therefore, after the upper and lower mold shells are clamped with clamps or glued with resin, the mold can be formed without sand box. Shell casting is especially suitable for all kinds of alloy castings with high dimensional accuracy, thin wall and complex shape.
Shell casting has been widely used in the production of precision castings because of its high production efficiency, good production environment and smooth casting surface. For example, Xuzhou ESCO and Suzhou Brackett have begun to use shell casting method to replace the traditional wax loss casting method to produce bucket tooth castings. The problems and defects of bucket teeth castings in production are discussed, so as to provide some references for the better application of this technology in the production of bucket teeth and other fine castings.
The production of precision castings such as bucket teeth by shell casting method is in the initial stage in China’s casting industry, which has a large development space. This process can be popularized and applied to the production of small and medium-sized castings of various materials, and the production organization flexibility is very high. As long as effective production operation control methods are adopted for production operation control and management, the core making, smelting and pouring processes are strictly controlled, and the process parameters of each process are stabilized, the occurrence of casting defects can be effectively prevented.