Under normal circumstances, the general small generator casing is made of cast steel, and the large generator is welded with steel plates.

The material of the motor casing is generally cast iron and cast aluminum alloy. Section steel (steel pipe), steel plate, etc. Domestic low-power motors generally use cast iron, cast aluminum alloy, and section steel (steel pipe) casings, which have a large amount of workpiece processing, many processing procedures, and long production cycles; the operator's working environment has poor sanitation conditions and high labor intensity; large energy waste, material Waste fire.
Internationally, developed countries such as Germany, Pod, Japan and other countries have already adopted a large number of steel caskets as early as the middle of this century. This new type of casing processing technology is a very low-cutting processing technology. Some domestic motor manufacturers began to study the manufacture of steel plate casings in the early 1970s, and formed a certain batch in the mid-1980s. However, because the shearing machine is used for cutting material - pressing "U" type (or pressing "W" type) - pressing "O" type, electric welding (manual or carbon dioxide shielded welding) - polishing - one by one machining - one by one The block shaping process scheme (referring to the chassis without feet) uses many types of equipment, and the proportion of artificial factors affecting the quality is large, and the quality assurance is difficult.

At present, some developed countries have generally adopted advanced special processing equipment for the manufacture of steel plate casings, with high degree of mechanization and automation, and good quality. The low-power motors that appear in the motor markets of advanced countries have generally been steel-shell motors. In 1989, the domestic trial production of temple processing equipment for steel plate casings - steel plate casing rounding machine, motor steel plate casing welding machine and other stand-alone machines has been started. In recent years, materials are expensive, and the domestic motor market is weak. In order to reduce the manufacturing cost of the motor, improve the quality of the steel plate casing, and enter the low-power motor of our country into the motor market of the developed countries, and occupy this market, it is necessary to carry out research on the new process of manufacturing the steel plate casing of the motor.