英文原文
Casting
Casting is a metal smelting meet certain requirements of the liquid and poured into the mold, solidified by cooling, the whole-are scheduled to be dealt with after the shape, size and performance of the casting process. Casting hair due to the near embryo forming, and machining to avoid or reduce a small amount of the purpose of processing costs and to a certain extent, reduce the time. Casting modern machinery manufacturing industry is the basis of one.
Casting many different types, according to the customary method of modeling is divided into: ① ordinary sand casting, including wet sand, dry sand and chemical hardening Sand three categories. ② special casting, by modeling materials can be divided into natural mineral sand as the main form of special casting material (such as mold, mud-casting, casting workshop shell casting, vacuum casting, it is type casting, ceramic mold casting , etc.) and metal casting for the main special casting material (such as metal-casting, pressure die casting, continuous casting, low-pressure casting, centrifugal casting, etc.) two. Casting Process usually include: ① mold (the liquid metal into solid casting containers) prepared by casting materials used can be divided into sand, metal, ceramic, clay, graphite type, and so on, by frequency of use can be divided into one-time type, semi-permanent and permanent-type, and the pros and cons of the mould for casting quality is the impact of the main factors; ② melting and casting metal casting, metal casting (casting alloys) main cast iron, cast steel and non-ferrous foundry alloy castings deal with ③ and testing and treatment, including removal of casting and casting surface core foreign body, with pouring riser, and shovels and grinding burr Prix joints, and other protrusions and heat treatment, surgery, such as anti-rust treatment and rough.
Casting process can be divided into three basic parts, namely casting metal preparation, preparation and casting mold processing. Metal
