Household appliances are closely related to people’s daily life, such as household air conditioners, household air conditioners, refrigerators, washing machines, household kitchen appliances, household beauty care appliances, household sanitary appliances, etc. In 2019, the accumulated main business income of 1-8 home appliance industry reached 1.05 trillion yuan, an increase of 4.7% year-on-year, and the total accumulated profit reached 79.897 billion yuan, an increase of 14.9% year-on-year. All kinds of products maintained the growth trend. There is an indispensable part in household appliances, which is, powder metallurgy parts: sintered metal oil bearing and sintered metal mechanical structure parts.

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Washing machine industry is mainly automatic washing machine at present. The full-automatic washing machines sold on the market are generally divided into three categories: the front-end side opening roller washing machine invented in Europe, the wave wheel top opening washing machine invented by Asians, and the “agitated” washing machine invented in North America. Many powder metallurgy parts are used in the middle, and some steel parts are changed into powder metallurgy parts For example, General Electric Company of the United States has redesigned two steel parts in the gearbox of the “agitated” automatic washing machine: lock tube and spin tube into powder metallurgy parts, which has improved the production cost and product quality, reduced the production cost of materials, labor, management cost and waste loss, and saved more than 250000 US dollars annually Yuan.

At present, China’s household appliances have entered a stage of steady development. The quality of household appliances and their materials is becoming increasingly important, especially the powder metallurgy materials widely used in household appliances. Because, some home appliance materials and parts can only be made by powder metallurgy, such as porous self-lubricating bearings of refrigerator compressors, washing machines, electric fans, etc.; some home appliance materials and parts are made by powder metallurgy with better quality and lower price, such as complex shape gears and magnets in the exhaust fans of home air conditioners and vacuum cleaners, etc. In addition, powder metallurgy plays an important role in maintaining ecology, protecting environment and saving materials and energy.