What are the requirements for the structure and properties of plain bearing materials and what are the materials used?
Oh, just as I used to work as a technician in a miniature bearing factory for years. Rolling bearings rely on ball bearings to reduce resistance and support rotation; the sliding bearings depend on the clearance of the bearing bush to reduce resistance and support rotation. In sliding bearing, the Bush and lining are directly matched with the shaft neck, and there is friction between them, and they also bear the action of alternating load and impact load. The shaft is one of the important parts of the machine, the manufacturing process is complex, high cost, difficult to change, to ensure that the shaft is minimum wear, bearing hardness should be much lower than the shaft neck, if necessary, replace the bearing wear and continue to use the shaft. [properties]: sufficient compressive strength and fatigue resistance; good performance for reducing friction (friction coefficient is smaller); reserve good lubricating function; good adaptability; good thermal conductivity and corrosion resistance; good process performance, which is easy to manufacture, low price. A material can not meet the performance requirements at the same time. The sliding bearing alloy can be inserted into the bush of the 08 steel by casting method, and the bimetallic bearing can be made.
[organization]: the bearing alloy should have the ideal organization of both hard and soft: (1) soft matrix and uniformly distributed hard point (2). Soft particles are distributed on the hard matrix. When the bearing is working, the soft tissue is firstly worn down and sunken, and the lubricant can be stored to form a continuous distribution of oil film, while the hard component plays the role of supporting the journal. Thus, the actual contact area of the bearing and the shaft neck is greatly reduced, so that the friction of the bearing is reduced.
