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The forming method of smelting metal, making a mold, and pouring the molten metal into the mold, and obtaining a casting with a certain shape and performance after solidification is called casting. When molding (core making) with molding sand, it is called sand casting.
Special casting sand casting has low dimensional accuracy, rough surface, low productivity, unstable quality, and high labor intensity.
All casting methods that are different from traditional ordinary sand casting are collectively referred to as special casting.