Several common methods for increasing accuracy of timken thrust ball bearing installation

People sweat is a colorless transparent or light yellow with salty in weak acid liquid, its ph value of 5 ~ 6 in addition to containing sodium, potassium, calcium, magnesium salt, also contains a small amount of urea, lactic acid, citric acid and other organic acids when sweat in contact with the metal, the metal surface to form a film of sweat, sweat film will cause electrochemical action on metals, and the corrosion of metal used in some special conditions, adding a small amount of solid lubricant grease, such as adding 1 of 3-5% molybdenum disulphide can reduce wear and improve the compressive strength heat-resistant ability, for high temperature, high, high vacuum, corrosion resistance, resistance to radiation, and the special conditions such as extremely low temperatures, the solid lubricant in engineering plastics and powder metallurgy materials, lubricating thrust ball bearing can be made with parts, such as the solid lubricant with adhesive bonding on the raceway, cage and rolling body, lubrication film formation, has certain effects on reducing the friction and wear is an important characteristic of lubricating oil viscosity, viscosity directly affect the liquidity of lubricating oil and the size of the friction surface is formed between the oil film thickness, thrust ball bearing working temperature of lubricating oil viscosity is usually 12 - bearing 15 CST speed more Gao Yingxuan lower viscosity, load more weight should choose the higher the viscosity of the commonly used lubricating oil has machine, high-speed machine oil, turbine oil, compressor oil, transformer oil, cylinder oil drip lubrication, such as suitable for the need to ration oil bearing parts, drip oil every 3 - general 8 seconds a drop of advisable, too much oil will cause bearing temperature increased thrust ball bearing in the host after the installation, such as measuring thrust ball bearing spindle radial runout, can be found that the each measured value of a certain change; Continuous measurement, can be found that after a certain number of revolution, this change will approximately duplicated. Measure for cyclic rotation accuracy degree of the change, change the approximately duplicated the revolution, on behalf of cyclic rotation accuracy 'cycle', the value of the amplitude changed in quasi cycle, is the cycle rotation accuracy is poor. Such as the thrust ball bearing spindle to the proper preload, speed gradually rise to close to the working speed, on bearing the 'break-in' effect, can improve the circulation of the spindle rotation accuracy. 2. A method to improve the precision of thrust ball bearing manufacture precision instruments in one power plant, the type 6202 / P2 bearing spindle and its precision is still cannot meet the requirements, the bold shaft neck and on the race to replace the inner ring, and the steel ball, the measurement of waxy secret, to size every three grain of a group, each group of steel ball are separated pick up close to 120 °, due to reduced a heavy processing surface, reduce the heavy blend surface, at the same time improve the axial stiffness of the bearing system, and the three largest grain and minimum three grain of steel ball nearly equidistant distribution, and improves the precision of drive shaft rotation, thus satisfying the requirements of the precision of the instrument. 3. Thrust ball bearing installation precision of the comprehensive check the timken bearing load thrust ball bearing of the spindle, the installation precision calibration sequence is as follows, Trunnion as 60 - 100 mm engine lathe as an example) :( 1) Measuring the size of the shaft and bearing hole, to determine with precision of the bearing, cooperate with requirements as follows: take the interference fit, inner ring on the shaft interference was 0 ~ + 4 microns ( At light load, high precision of 0) ; Outer ring and bearing hole clearance fit, the interval 0 ~ + 6 microns ( But on the free end bearing with angular contact ball bearing, still can increase the clearance) ; Shaft and hole surface roundness error in under 2 microns, timken bearing the face of baffle used parallelism in under 2 microns, shaft shoulder end foreign face beat in under 2 microns; Axis bearing hole block shoulder to beat under 4 microns; Spindle axis inside the front cover end face beat under 4 microns. ( 2) Fixed end before the installation of the bearings on the shaft bearing with clean to clean a thorough cleaning of kerosene, the grease lubrication, to contain 3% ~ 5% of organic solvent injection bearing grease for degreasing, cleaning and quantitative grease oil gun will fill in the bearing inner ( Accounts for 10% ~ 15%) of the bearing space volume ; Heat bearing the heat up 20 ~ 30 ℃, using hydraulic press the bearing into shaft end; Will set casing pressure on the shaft and with appropriate pressure against bearing face makes its axial positioning; The lace will spring balance volume on the timken bearing outer ring, use the method of measuring start torque check is the preload of the regulation for substantial changes ( Even if the bearing is correct, but due to cooperate or cage, the deformation of the preload is also has the potential to change) 。