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"Sand casting" refers to placing the lower mold half on the flat plate, compacting and leveling the molding sand in the sand box. After the lower mold is completed, the manufactured sand mold is turned over 180 degrees, placed on the upper mold half, coated with release agent, placed in the sand box, compacted and leveled the molding sand, and the upper sand box is turned over 180 degrees, and the upper and lower molds are taken out respectively. This process is commonly known as "turning sand". Turning sand casting is a casting with clay resin sand as molding material, which has a long history and is also the most widely used process. Speaking of a long history, it can be traced back to thousands of years ago; As far as its application scope is concerned, it can be said that it is found all over the world.