In addition, the casting performance and wear resistance are good, and it is generally used to manufacture medium and low load bearings, such as automobile and tractor crankshaft bearings.2%. Bimetal bearings are often used in production, that is, centrifugal casting is used to cast a thin layer of tin-based bearing alloy on the low-carbon steel bearing bush to improve the strength and life of the bearing. Our country is gradually using it to replace tin-based, lead-based and copper-based bearing alloys, thus saving a lot of industrial copper. The microstructure of the Al-Sb alloy is that the metallic compounds AlSb and Mg3Sb2 hard spots are evenly distributed on the soft aluminum-based solid solution. They have been widely used in my country for medium and high-speed automobiles and tractor diesel engine bearings. Therefore, aluminum-based bearing alloys are widely used in diesel engine bearings of automobiles and tractors that work under high speed and high load. Figure 2 Phase diagram of Pb-Sb alloy Lead-based bearing alloys can be made into double-layer or triple-layer metal structures. Performance requirements of bearing alloys Sliding bearings are parts used to support shafts for work in machinery manufacturing industries such as automobiles, tractors, and machine tools. During the rolling process, the oxide film on the aluminum surface is broken due to extension, and the remaining oxide film is spheroidized by subsequent recrystallization annealing, so the bonding strength with the steel back is greatly improved. The soft base or mass can withstand shock and vibration and make the shaft and the bearing bush run in well. It is rolled Wholesale Mechanical roller bearing manufacturers together with low-carbon steel into a bimetallic bearing, which can work under the conditions of a pressure of 28MPa and a sliding linear velocity of 13m\/s, and its seizure resistance is equivalent to that of Babbitt alloy. The most commonly used tin-based bearing alloy is ZSnSb11Cu6. The Pb-Sb binary alloy phase diagram (Figure 2) has a eutectic transition. In its composition, WSb=3. Its WSb=16%, WSn=16%, and WCu=2% are hypereutectic alloys. High tin aluminum-based bearing alloys have higher load carrying capacity and fatigue strength. Adding Cu and Ni to the Al-Sn alloy, because they can be dissolved in Al, can further increase the strength of the matrix. In addition, the soft matrix or particles can be embedded by accidental external hard points to avoid scratching the journal. The nascent \u03b2 compounds Cu2Sn and SnSb are hard spots in the alloy (see Figure 3). It has good thermal conductivity and corrosion resistance to prevent the bearing bush and the shaft from being seized due to strong friction and heating, and can resist the corrosion of lubricating oil. When the shaft rotates in the bearing bush at high speed, strong friction is bound to occur, and the bearing bush also bears the periodic load transmitted to it by the journal.