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　　What are the methods of die-casting casting

　　Die casting is an efficient and precise method of metal casting, which involves injecting molten metal into the mold cavity under high pressure, and then rapidly cooling and solidifying to obtain the desired shape of the part. With the continuous development of industrial technology, die-casting casting methods are also constantly innovating and improving. Currently, there are several common die-casting casting methods:

　　1. Hot chamber die casting: Hot chamber die casting is one of the earliest die casting processes. In a hot chamber die-casting machine, the furnace is directly connected to the injection chamber, and the molten metal remains in liquid state inside the injection chamber. When the injection punch advances, push the molten metal into the mold cavity. The advantages of hot chamber die casting are high production efficiency, low metal liquid loss, and easy automation control of the die casting process. However, due to long-term contact with molten metal, the injection chamber is susceptible to corrosion and is therefore only suitable for die-casting of non-ferrous metals with lower melting points, such as zinc, tin, lead, and other alloys.

　　2. Cold chamber die casting: The furnace and injection chamber of the cold chamber die casting machine are separate. Before each die-casting, a certain amount of molten metal needs to be scooped into the injection chamber, and then die-casting is carried out. Cold chamber die casting is suitable for non-ferrous and ferrous metals with high melting points, such as aluminum alloys, magnesium alloys, copper alloys, and steel. Compared with hot chamber die casting, the equipment structure of cold chamber die casting is more complex, but it can die larger and more complex shaped parts, and the mechanical properties of the castings are better.

　　3. Semi solid die-casting: Semi solid die-casting is a die-casting method that injects semi-solid metal slurry into the mold cavity for molding. Semisolid metal slurry has certain fluidity and thixotropy, which can better fill the mold cavity during die casting and reduce the occurrence of defects such as porosity and shrinkage. Semi solid die casting can improve the quality and performance of castings, while also reducing production costs and energy consumption. At present, semi-solid die casting technology has been widely applied in fields such as automobiles and aerospace.

　　4. Vacuum die casting: Vacuum die casting is the process of extracting air from the mold cavity to create a certain degree of vacuum, thereby reducing defects such as porosity and looseness inside the casting. Vacuum die casting can improve the density and mechanical properties of castings, and enhance the surface quality of castings. At the same time, by reducing the involvement of gas, the erosion and wear of the mold can also be reduced, extending the service life of the mold. Vacuum die casting is suitable for the production of castings such as aluminum alloys and magnesium alloys that require high quality.

　　5. Squeezing Die Casting: Squeezing die casting is a new type of die casting process developed by combining the characteristics of extrusion casting on the basis of die casting. In the process of extrusion die casting, molten metal is first injected into the mold cavity, and then a certain extrusion force is applied when the metal liquid has not completely solidified, so that the metal liquid solidifies into shape under the pressure. Squeezing die casting can improve the density and mechanical properties of castings, reduce defects such as porosity and shrinkage, and also increase the utilization rate of materials.

　　In short, different die-casting casting methods have their own advantages, disadvantages, and applicable ranges. In actual production, the appropriate die-casting casting method should be selected based on factors such as the shape, size, material, performance requirements, and production batch of the parts to improve production efficiency, reduce costs, and ensure product quality.

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