Precision casting technology in the automotive field

The accurate casting of automobile casting is usually referred to as the disappearance and molten mold casting technology. With the development of automotive casting technology, the precise forming of casting refers to a class of casting. The castings produced through this type of forming method can be used directly without cutting or cutting less. With the improvement of the accuracy of casting size, the precise forming technology of casting has developed rapidly in recent years, and a series of new casting methods such as accurate sand casting, disappearing mold casting, controllable pressure casting, and pressure casting have appeared. One of our methods of using the sand core combination and controlling pumping with electromagnetic pumps has been successfully used in batch production of aluminum alloy cylinder, and many process variants have appeared, such as low -voltage pouring instead of electromagnetic pump pouring. The use of this cast method can produce aluminum alloy cylinder with a wall thickness of 3.5 ~ 4.0 mm. It is a representative process of accurate sand casting.

The automobile casting of the disappearance of the mold casting process is the cylinder body, the cylinder head, and the exhaust pipe, and form a scale production. In the 1990s, my country has introduced disappearance of modular casting technology. It has begun to take shape and has been promoted by the country to become the most widely used high -tech to transform traditional casting industry applications. At present, there are three types of melting mold precision casting processes in my country, composite shells and silicon -soluble shells. Among them, the surface quality of the casting of the silicon -soluble shell production process for automobile products can reach RA 1.6 μm, and the size accuracy can reach CT4 Level, minimum wall thickness can be 0.5 ~ 1.5 mm. We use silicon -soluble+water glass composite shelling process to produce complex structured castings, which significantly reduces production costs. The development trend of the molding technology for molding technology for melting models is that the distance between the castings is getting closer and closer to the final product, and the complexity and quality of the product are getting higher and higher. Began to appear.

The process methods such as vacuum casting, oxygen die -casting, semi -solid metal flow or tactile transformer casting developed on the basis of high -voltage casting process are designed to eliminate casting defects, improve internal quality, and expand the application range of die castings. During the squeezing casting process, the melt has the advantages of stable, non -metal splash, less metal splash, less oxidative metal oxidation, energy saving, operation safety, and reduced casting pore defects. The development and application of high -performance aluminum alloy castings have been widely used.

The continuous growth of automobile production is urgently required to develop production towards high -quality, excellent performance, near -net, multi -variety, low consumption, low cost, and low cost direction. Because about 15%to 20%of a whole vehicle is a casting. This requires the casting industry to continue to apply various new technologies and new materials to improve the overall level of casting. The precise casting technology of castings can meet the above requirements of car castings, and its applications will also cover different casting and production process of car castings.

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