The bush material and structural analysis

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The bush material and structural analysis

The pad on the bearing, directly with the shaft contact portion, load bearing, and having a relative movement with the shaft. To reduce friction, wear of the bearing material put forward various demands, in addition to the requirements between the friction pair friction coefficient, wear-resistant outer should meet the following:
1 should have a sufficient compressive strength, fatigue strength and the ability to withstand shocks. The thickness of the bearing alloy (0.013-0.13) mm.
2 the blocking resistance is good. When the load, high speed, bearing clearance is too small, surface finish, poor lubrication, pay attention to the careful selection of materials matched to prevent adhesive wear of the friction pair glued.
Adaptability and the ability to accommodate foreign body. Low hardness, good plasticity and low coefficient of elasticity of the material has good adaptability and the ability to accommodate foreign body.
Corrosion resistance, low price, source of foot. Gelatinous sediment generated by the oxidation of the corrosive effect of the bearing material.
First, the commonly used materials
Bearings and bearing liner commonly used material is divided into two major categories of metal materials and non-metallic materials.
Metal materials:
Cast Iron
Ordinary gray cast iron, cast iron, ductile iron
Suitable for low speed light load, or open drive bearing
Mechanism: flaky or globular graphite component material covering the lubricating effect graphite layer formed on the surface.
2. Bearing alloy
ZChSnSb10-6 anti-corrosive, anti glued ability, combined with the steel back in prison, expensive, and suitable for high-speed heavy, such as rolling stock.
Poor ZChPbSb16-16-2 anti-gluing, thermal expansion difference, crisp suitable for medium speed contained.
This Babbit good wear resistance, anti-gluing, thermal conductivity, and bush material most suitable to do.
3 bronze
ZCuPb30 use casting or sintering attached to the surface of one pair of metal Steel Bearing, anti glued performance
ZCuSn10-l anti-friction and wear resistance are very good, the best bearing material, high-speed heavy
Alloy high hardness and strength of such materials than pasteurized, corrosion resistance, but ran poor adhesion, the matching journalled require high hardness and smoothness, suitable for medium speed overloaded.
4 aluminum alloy - bimetallic
Low tin aluminum alloy containing Sn0.5%
Wazhou the material and structure of the sliding bearing
High tin alloy, containing Sn20%, locomotive diesel
Such materials, high strength, corrosion resistance, and good thermal conductivity.
5. Ceramic quality metal
Iron powder of ten graphite powder or copper powder 10 graphite powder → press molding → sintering to form a porous structure, the pores constituting 15 to 35% → immersion oil cook → oil bearing.
This bush poor toughness only applies to the steady load and small and medium-speed, occasions for poor lubrication conditions.

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