The life of sliding bearing

In the lubricating film formation mechanism, flow, system to touch the ground, bearing static and dynamic characteristics and stability of the research: in the new structure, new materials and processing technology also has the certain research. Decades bearing basic theory research, mainly including ray words party, bearing work on solving, bearing stability analysis and reliability research and study on the lubrication theory, etc. , formed a certain theoretical and experimental basis, part of the theory have also been into actual products, such as foil static pressure gas bearing turbine expander has been widely used in air separation industry a variety of oxygen ( Chloride) Device, the cumulative production more than 6000 units. But not the water lubricated bearing done ( 3) Sliding bearing materials and process research bearing materials and surface treatment has important influence on the performance of the bearing. With the application of new materials and surface treatment, can improve the working performance on the surface of the bearing parts, and then improve the performance of the bearing. In the sliding bearing, bearing and bearing liner materials referred to as the bearing materials. Sliding bearing materials mainly have a metallic materials, non-metallic materials and metal nonmetal composites babbitt is usually divided into three categories tin base babbitt and lead-based babbitt, due to the low friction characteristics babbitt is only suitable for relative to the materials of low hardness, compared with other bearing material, has better adaptability and pressure in the sex, it is widely used in large Marine diesel engine, turbine, alternator, and mining machinery and other large rotating machinery, etc. Tin base alloy is currently used for the main material of sliding bearing, tin-based bearing alloy is on the basis of tin antimony alloy add copper alloy, hard spots in soft matrix type organization, the main advantages of small friction coefficient, line shadow small expansion coefficient, good thermal conductivity, good resistance, manufacturability and embeddedness; Main drawback is that the fatigue strength is poorer, the highest working temperature is below 110 ℃, and the tin surface sparsely populated, so it is suitable for making important bearing, such as steam turbine, turbine, the internal combustion engine, compressor and other large machinery high-speed bearing, etc. , the commonly used brand Zchsnsb116, Zchsnsb8 - 4, Zchsnsb88, etc. Although lead base close degree and hardness is lower than tin base alloy, corrosion resistance is poor, but the cost is low, and the quality of the casting and grinding is better, is suitable for making middle and low load bearing shell, such as automobile, tractor crankshaft bearing, etc. The obvious advantages of this kind of alloy is of low cost, good high temperature strength, good oil wet, have self lubrication, is suitable for the poor lubrication of occasions, but the corrosion resistance and thermal conductivity as tin-based bearing alloy, the steel back with focus on the poor. Its main brands have Zchsnsb116, Zchsnsb8 - 4, Zchsnsb44, etc. As high performance processing of mechanical equipment, the use of sliding bearing conditions to develop high temperature, high speed, the respect such as overloading, domestic babbitt material performance remains to be further improved. Engineering plastics, such as phenolic resin ( Bakelite) , nylon, ptfe, etc. , not only have certain self lubrication, and have wear-resisting and anti-seizure etc, which is widely used in the sliding bearing. Often can protect the shaft neck, plastic bearings vibration absorption is better than that of metal, and the corrosion resistance is strong, density is small, light weight. But its mechanical strength less than metal tile, and is affected by temperature and wet, dimension stability is not high, poor thermal conductivity. The Glacier metal company in plastic, bronze, steel composite self-lubricating bearings, can work under dry friction or lubrication conditions, can be found in a 200 ~ 280 ℃ under the condition of a vibration and impact load. Graphite bearing metal composite material is a kind of excellent properties with dip soared to belong to fill in the graphite bearing material science, mechanics and tribology performance is excellent, both for the comprehensive performance of graphite and metal, can effectively reduce the working temperature. This material is not easy to occur under high temperature softening or high loading compression deformation, therefore in the atmospheric temperature as high as 400 ℃, under the condition of zero some can reach 540 ℃ in foreign countries, bearing materials has been brought to the attention of the large bearing manufacturers. Waukesha company developed ceramic and polymer bearing technology, through the use of advanced materials, can effectively extend the service life of bearing