Iron and steel metallurgy

Powder metallurgy bearings are made of metal powder and other anti-friction material powders by pressing, sintering, shaping and impregnating with oil. They have a porous structure. After being soaked in hot oil, the pores are filled with lubricating oil. During operation, due to the suction effect of the rotation of the journal and the frictional heat, the metal and oil are heated and expanded, and the oil is squeezed out of the pores, and then the friction surface plays a lubricating role. After the bearing is cooled, the oil is sucked back into the pores.

Powder metallurgy oil-containing bearings (oil-containing bearings) are a type of porous alloy products with lubricating oil impregnated in the pores. When the shaft rotates, the temperature of the oil-containing bearing rises and the pumping effect is caused by the friction between the shaft and the oil-containing bearing. The lubricating oil seeps out of the friction surface of the inner diameter or outer diameter of the oil-containing bearing, and when the shaft stops rotating. The lubricating oil flows back into the oil-containing bearing. Therefore, the consumption of lubricating oil is very small, and it can be used for a long time without supplying lubricating oil from the outside. It is very suitable for occasions where oil supply is difficult and lubricating oil pollution is avoided.

Oil-containing bearings are widely used in various mechanical equipment such as the motor industry, automobile and motorcycle industry, home appliance industry, digital products, office equipment, power tools, textile machinery, packaging machinery, etc.

Powder metallurgy oil-containing bearings are generally made of raw material powder through processes such as pressing, sintering, shaping, and oil immersion. Most of the current machines are highly automated. The daily output is relatively large, and most products can be formed in one go, so the larger the batch, the better the production. Moreover, if there are fewer molds now, hundreds of thousands of pieces may be made, and if there are more, more than one million pieces may be made. However, the mold cost is relatively high, so it is not easy to make a small batch, and the time to replace the mold is also long.

Powder metallurgy oil-containing bearings can generally be formed in one go, and basically no cutting is required. The cost is lighter than machining, and there is less material waste, so the price is relatively cheap. It also conforms to the current national policy of advocating energy conservation, so it is considered to be a technology that will not be outdated.

The base of the powder metallurgy oil-containing bearing has been filled with lubricating oil by vacuum impregnation, and due to temperature rise and pump suction during operation, the lubricating oil in it will seep into the running surface, so it can be used in occasions where no additional lubricating oil is added.