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General manufacturing materials for plain and plain bearings

2019-06-17

A bearing that is subjected to a sliding motion by a shaft and a bearing is called a sliding bearing.

According to the principle of oil film formation on the two opposite moving surfaces of the sliding bearing. Can be divided into fluid dynamic pressure lubrication bearings (also known as dynamic pressure bearings) and hydrostatic bearings (also known as hydrostatic bearings).

Generally discussed is a hydrodynamically lubricated bearing that carries oil between two surfaces by relative movement of the shaft and the bearing to form a sufficient pressure film to separate the two surfaces to withstand the load.

Commonly used bearing materials are divided into metal materials and non-metal materials.

(1) Cast iron. Ordinary gray cast iron or wear-resistant gray cast iron with nickel, chromium and titanium alloy composition, or ductile iron can be used as a material for light-load low-speed bearing bushes. In these materials, a sheet-like or spheroidal graphite component is coated on the surface of the material to form a layer of lubricating graphite. After the surface of the wear-resistant cast iron is phosphating, a porous thin layer can be formed, which helps to improve the wear resistance.

(2) Bearing alloy. (usually babbitt or white alloy) bearing alloys are divided into two categories: one is based on tin, adding appropriate amount of bismuth and copper, called tin-based bearing alloys, such as ZChSnSb11-6; the other is Lead is the basic component, and an appropriate amount of tin and antimony is added, which is called a lead-based bearing alloy such as ZCnPbSn16-16.

(3) Copper alloy. Copper alloys can be divided into: cast lead bronze; cast tin zinc lead bronze; cast tin phosphor bronze; cast aluminum bronze; cast brass.

(4) Aluminum alloy. It is divided into two categories: low tin aluminum alloy, containing about 6.5% tin; high tin aluminum alloy, containing tin up to 20%.

(5) Ceramic metal. This is a bearing material that is pressed and sintered with different metal powders. The material is porous, and the pores account for about 10% to 35% of the volume. The immersion in the hot oil before use makes the pores full of lubricating oil. It has self-lubricating properties, also called oil-bearing bearings.

(6) Graphite. The graphite bearing bush can be pure graphite, and its strength is low; plastic, resin, silver, copper or babbitt alloy can also be added to improve strength and improve adaptability.

(7) Other non-metallic materials.

1) Rubber. It is mainly used as a lubricant for water and is relatively dirty.

2) Phenolic tape. It is a layered structure of cotton, asbestos or other rayon fabric bonded with phenolic resin.

3) Nylon. Used on low load bearings.

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