Casting is a metal thermal processing technology that has been mastered by humans for a long time. It has a history of about 6,000 years. China has entered the heyday of bronze castings between 1700 and 1000 BC, and the process has reached a fairly high level. Casting is a method of casting liquid metal into a casting cavity that conforms to the shape of the part, and after cooling and solidifying, to obtain a part or blank. The material to be cast is mostly a metal that is originally solid but heated to a liquid state (eg, copper, iron, aluminum, tin, lead, etc.), and the material of the mold may be sand, metal or even ceramic. The method used will vary depending on the requirements.