performance
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. (3) The cost of liquid molded parts is low. Liquid forming allows direct use of waste parts and chips, resulting in lower equipment costs. At the same time, the liquid molding parts have a small processing margin and save metal. However, there are many processes for metal liquid forming, and it is difficult to precisely control, so that the quality of the casting is not stable enough. Compared with forgings of the same material, due to loose liquid structure and coarse crystal grains, defects such as shrinkage cavities, shrinkage, and pores are easily generated inside. Its mechanical properties are low. In addition, labor intensity is high and conditions are poor. It has excellent mechanical and physical properties. It can have a variety of strength, hardness and toughness. It can also have one or more special properties, such as wear resistance, high temperature resistance, low temperature and corrosion resistance.
Castings are available in a wide range of weights and sizes. The lightest weight is only a few grams, the heaviest is 400 tons, the thinnest wall is only 0.5 mm, the thickest can be more than 1 meter, and the length can range from a few millimeters to a dozen meters. It can meet the requirements of different industrial sectors.
use
Castings are used in a wide variety of applications, and have been used in hardware and the entire machinery and electronics industry, and their use is expanding. Specifically used in construction, hardware, equipment, engineering machinery and other large machinery, machine tools, ships, aerospace, automotive, locomotives, electronics, computers, electrical appliances, lamps and other industries, many are ordinary people all day contact, but do not understand Metal objects.
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