Wind power bearings are the key components for the steering connection of yaw, pitch and transmission systems in the unit, including yaw bearings, pitch bearings and main shaft bearings. Its main role is to support the rotating shaft or other moving body, guide the rotation or moving movement, and carry the load transferred from the shaft and the parts on the shaft. The precision, performance, life and reliability of the bearings play a crucial role in determining the performance and reliability of the main engine.
Everyone should have seen the working environment of wind turbines, usually in the open field, working conditions are very harsh, temperature, humidity and bearing load changes are very large. Wind speeds can reach up to 23 meters per second, and there are also shock loads. Because of this, the bearing sealing performance, lubrication performance, shock resistance, life and reliability have high requirements. The generator has to start up in winds of magnitude 2-3 and has to be able to track changes in wind direction, so the bearing structure needs to be specially designed to ensure low friction and high sensitivity, and the large yaw bearings require a toothed outer ring. In order to keep the wind turbine in the best condition, the bearing design, material, manufacturing, lubrication and sealing need to be specially designed, so as to better guarantee the good operation of the wind power equipment, and significantly improve the performance and reliability of the equipment.
In the wind power equipment system, maintenance should not be ignored. Wind turbines are often installed on mountains, in deserts or on coastlines where maintenance is not easy. Condition monitoring systems can assist in monitoring the performance of the drive train, and predictable maintenance can improve the performance and reliability of these systems, increasing the effective running time of the equipment. For example, through vibration analysis, oil analysis and infrared thermal imaging to monitor the state of the equipment, so as to determine the best time to repair; through predictive maintenance can improve the reliability of the equipment operation, and only when the equipment needs to be repaired, to avoid excessive maintenance and reduce maintenance costs.
Manufacturing materials for wind power bearings: Different materials and heat treatment methods are used for different parts of the bearings. For example, in order to improve the yaw and pitch bearings in 40CrMo steel at low temperatures (ambient temperature - 40 ℃ - - 30 ℃, bearing operating temperature at - 20 ℃ or so) under the impact work and other mechanical properties, the need to use a special heat treatment method, but also to control the surface of the induction quenching of the depth of the quenching layer, the surface hardness, the width of the soft zone and the surface cracks; speed increaser bearings should be developed to be equivalent to foreign STF, HTF steel materials, and control the optimal content of its residual austenite; in the case of domestic vacuum degassing steel quality there is still a gap, the spindle bearing can be used electroslag remelting carburizing steel G20Cr2Ni4A manufacturing and so on.
Slewing bearing bearings and wind power bearings are large bearings, the diameter of which is basically more than 1 meter, and some are even close to 3 meters. After heat treatment, these bearings are more or less deformed, plus their own hardness is above HRC55, which brings great challenges to the hard turning tools --PCBN tools.
The hard turning parts of wind turbine bearings and slewing bearings mainly include the outer raceway, inner raceway, and retaining edge position, with common materials such as BTS2800 and BT6000 developed by Zhengzhou Berlt, and inserts such as SNMN150716, CNMN120712, and SNGN12041 are relatively common. These tools not only have a large cutting allowance, but also can withstand intermittent cutting, which can effectively meet the needs of manufacturers to reduce costs and increase efficiency. Zhengzhou Berlt PCBN tools support customized solutions, welcome to contact us.
