Theoretical metal liquid forming of castings is often referred to as casting, and casting forming technology has a long history. As early as 5,000 years ago, our ancestors were able to cast red and bronze products. Casting is the most widely used metal liquid forming process. It is a method of casting a liquid metal into a mold cavity and obtaining a shaped blank or part after it is cooled and solidified.
The proportion of liquid molded parts in machinery and equipment is very large. In machine tools, internal combustion engines, mining machinery, heavy machinery, liquid molded parts account for 70%~90% of the total weight; in automobiles and tractors, 50%~70%; Agricultural machinery accounts for 40% to 70%. The liquid molding process can be used in such a wide range of applications because it has the following advantages:
(1) It is possible to manufacture a blank having a complicated inner cavity and a complicated shape. Such as various cabinets, machine bed, cylinder block, cylinder head and so on.
(2) The process flexibility is large and the adaptability is wide. The size of the liquid molded part is almost unlimited, and its weight may be from several grams to several hundred tons, and the wall thickness may be from about 0.5 mm to about 1 m. Any metal material that can be dissolved into a liquid state in the industry can be used for liquid molding. For cast iron with poor plasticity, liquid forming is the only way to produce its blanks or parts.
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