1, casting: casting is a metal hot working process mastered by humans earlier, with a history of about 6000 years. China entered the heyday of bronze casting from about 1700 BC to 1000 BC, and its technology reached a fairly high level.
2. Die casting: 1838, in order to make movable type printing molds, people invented die casting equipment. The first patent related to die casting was issued by 1849. It is a small manual machine, which is used to produce type on the printing press.
Second, the characteristics are different.
1. casting: it can produce parts with complex shapes, especially blanks with complex cavities; Wide adaptability, common industrial metal materials can be cast, ranging from a few grams to hundreds of tons; Raw materials are widely available and cheap, such as scrap steel, waste parts and fragments.
2. Die casting: The castings have excellent dimensional accuracy, and internal structures such as threaded sleeves, heating elements and high-strength bearing surfaces can be directly cast. Other advantages include that secondary processing can be reduced or avoided, the production speed is fast, the tensile strength of the casting can reach 4 15 MPa, and the metal with high fluidity can be cast.
Third, the process is different.
1. Casting: All kinds of raw materials used for modeling and core-making in sand casting, such as casting raw sand, sand binder and other auxiliary materials, as well as molding sand, core sand and coatings prepared from them, are collectively called modeling materials. The task of preparing molding materials is to select suitable raw sand, binder and auxiliary materials according to the requirements of castings and the properties of metals, and then mix them into molding sand and core sand with certain properties according to a certain proportion.
2. Die casting: The traditional die casting process mainly consists of four steps, or it is called high pressure die casting. These four steps, including mold making, mold filling, injection and sand dropping, are also the basis of various improved die casting processes. In the preparation process, it is necessary to spray lubricant into the mold cavity, which not only helps to control the temperature of the mold, but also helps to demould the casting.
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