Investigations Of Large Wind Turbine Pitch And Yaw Of Bearing Steel

With the rapid development of modern industrial level, large size component has alsobeen more and more widely used in the production of life. The experimental method as thematerial properties of the traditional research method, not only need to work time and testcost a lot, but unable to evaluate the performance of the more accurate on the larger size.Along with the computer level of ascent, the finite element method in theory has becomemature, finite element simulation in the field of heat treatment has been applied in moreand more comprehensive and in-depth. So this paper choose the computer simulation andexperiment are combined to study this subject.Create the finite element simulation for three dimensional model is established byusing3D design software Solidworks three-dimensional entity model of wind powerbearing ring.In this paper, studying yaw bearing ring of numerical simulation for the process ofcooling is analyzed by using the finite element analysis software DEFORM3D for highpower wind turbines.From the studying we can get the material in the process of coolingtime, temperature and different parts of the instant cooling rate and have been obtained bysimulating the cooling curve under different cooling medium.The steels42CrMo、40CrNiMo and42CrMnMoB used for producing the ring ofhigh-power wind yaw bearing have been studied in this paper by means of theend-quenching test and heat treatment simulation testing. DEFORM software was used tomodel and output the oil quenching cooling curves at the one quarter position of theferrule wall, which were used for controlling cooling rate in the simulation of heattreatment furnace. Then the heat-treated samples undergoing a high temperature temperingand eventually their mechanical properties such as hardness、tensile and impact testingswere performed.Results of end-quenching test showed that42CrMnMoB steel possessed the highesthardenability in this study. Mechanical results showed that the strength of42CrMnMoBsteel was slightly lower strength than40CrNiMo steel, but significantly higher than 42CrMo steel. Moreover a farily high impact toughness was also obtained in42CrMnMoBsteel, which manifested that42CrMnMoB steel had an excellent combination of strengthand impact toughness. Therefore one can be concluded that the42CrMnMoB steel can beselected as a42CrMo replacement material to produce the ring of high-power wind yawbearing for its high hardenability and excellent coordination between strength andtoughness.