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Key skills of wind power bearings
Source: China Bearing Network Time: 2014-05-12
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(2) Information. Different parts of the bearings use different materials and heat treatment; such as the low temperature of 40CrMo steel for improving yaw and pitch bearings (ambient temperature -40~-30°C; bearing operating temperature is around -20 °C) ) Thermal treatment methods for mechanical properties such as impact work; surface hardened depth, surface hardness, soft band width and external crack (especially tooth root) for induction hardening; gearbox bearings equivalent to foreign STF; HTF The research and development of steel and the control of the optimal content of retained austenite; the spindle bearing has a certain distance in the quality of domestic vacuum degassed steel; the electroslag remelted carburizing steel ZG20Cr2Ni4A is used.
(3) Anti-corrosion and sealing. Some of the yaw and pitch bearings are exposed; they will be damaged by environmental pollution and corrosion; therefore, it is necessary to carry out the external anti-corrosion treatment for the entire service life. It is equally important; Sealing skills for grease leakage and external impurity intrusion.
(4) Special clearance requirements for yaw and pitch bearings. Because yaw and pitch bearings are subject to shock loads such as indeterminate winds; therefore; yaw bearings require small clearance; pitch bearings and yaw bearings Comparison; because the shock load received is larger; the oscillation transmitted by the blade is also large; so the demand is zero clearance may be slightly negative; to reduce the fretting wear of the rolling surface.
(5) Grinding of yaw and pitch bearing raceways. Because of the trend of large-scale wind power equipment; demanding bearings have higher starting and working flexibility. Therefore, the yaw and pitch bearing raceways have been processed. The conventional fine car was changed to grinding; the matching steel ball was also changed from G48 to G20.
(6) High-precision machining of spindle bearings and transmission bearings. The most important one is the spherical roller bearing selected; because of its layout features; it is difficult to achieve high precision in production; the general maximum machining accuracy is only P5; The existing drawing accuracy is the highest and the demand has reached P4.
(7) Improved depiction of cages for transmission bearings. The cage should have higher strength and wear resistance.
(8) Test experiment. The test experiment includes conflict torque measurement, simulation test machine and experimental procedures.
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