Casting generally is divided into ordinary and special castings. Ordinary sand casting, including wet sand, dry sand, chemical hardening sand categories. Special casting material according to the different shapes can be divided into two categories: natural sand and gravel as the main form of mineral materials, such as investment casting, shell casting, vacuum casting, clay-type casting, solid casting, ceramics casting, etc.; a class of metal as the main mold material, such as metal casting, centrifugal casting, continuous casting, pressure casting, low pressure casting.
Casting process can be divided into three basic parts, namely, preparation of metal casting, mold preparation and casting processing. Metal casting is the production of metal castings for the cast, which is a metallic element as the main ingredient, and adding other metals or non-metallic elements and the composition of the alloy, traditionally known as the casting alloy, there are cast iron, Steel and cast non-ferrous alloys.
After the cooling, the castings have to be removed for the gate, riser and metal burrs, so the clean-up process is necessary. Equipments for such work are shot blasting machines, gate riser cutting machines. Some castings for special requirements have to be treated by post-casting processing, such as heat treatment, plastic surgery, anti-rust treatment, rough machining and so on.
Casting is an economical method of rough shape, complex shape parts for more demonstrated its economy. Such as automotive engine block and cylinder head, ship propellers and exquisite works of art. Somewhat difficult to cut the parts, such as nickel-based alloy gas turbine parts can not be formed without casting method.
In addition, the casting of the part size and weight to adapt to a wide range of metal species is almost unlimited; parts in the mechanical properties in general also has the wear and corrosion resistance, shock-absorbing and comprehensive performance. Sometimes, you can not get those characters by other metal forming methods such as forging, rolling, welding and punching, etc. So casting methods used in the machine manufacturing industry produced rough parts, in the number and tonnage thus far is the greatest.
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