Numerical Simulation And Experimental Research On Heating Process Optimization Of 42CrMo Wind Turbine Bearing Ring

As a new type of renewable green energy,wind energy can meet people’s demand for energy in the continuous development of society,and to a certain extent alleviate the contradiction between regional energy supply and demand.Wind power bearing ring forgings are currently mainly made of 42 Cr Mo steel.As a key part of wind power equipment,product quality determines the working life of wind power equipment.In this paper,the 42 Cr Mo round casting billet and the ring billet after ring rolling are used as the research object.Through the ABAQUS finite element simulation,the temperature field and temperature field of the 42 Cr Mo round casting billet in the high temperature processing furnace and the ring billet heating in the quenching and tempering furnace are studied.The grain size changes to optimize the existing heating process;the corresponding grain size test and quenching and tempering process test research are carried out to stabilize and improve the performance of ring forgings on the basis of optimized process,energy saving and consumption reduction,and improve the competition of enterprise products force.Through the establishment of a high-temperature heating furnace model in the ABAQUS finite element simulation software,through the numerical simulation of the heating rate,the grain size of the holding time and the temperature field,it is determined that the round billet is heated to 160 ℃ /h at 650 ℃ after entering the furnace The heating method of holding at950℃ for 2 hours and then heating at 200℃/h to 1250℃ for 3 hours can reduce the high temperature heating time while meeting the control requirements for grain size.The experimental results of the grain size of prior austenite after quenching at different temperatures show that in the range of 900℃～1250℃,as the heating temperature increases,the austenite grains continue to increase.At 900℃～1000℃,the grain size growth rate is small,but the pre-austenite grains grow up sharply after 1150℃.The experimental results of the original austenite grain size are basically consistent with the results of the grain size at each temperature in the software simulation,which proves the correctness of the numerical simulation results,and also illustrates the necessity and effectiveness of reducing the high-temperature heating time as much as possible.Through the establishment of the heating model of the quenching and tempering furnace for numerical simulation,the grain size change and the temperature field change trend of the quenching stage at 850℃ and 900℃ for a certain period of time are determined.The results show that the temperature of the ring can be uniform after being heated to a high temperature for 2 hours,and the temperature can be evened by keeping the temperature for another 2 hours to homogenize the structure.The total time can save 1.5 hours of holding time.The test results of different quenching and tempering temperatures on the samples show that the martensite structure after quenching is transformed to tempered sorbite under the quenching and tempering treatments at different temperatures.When the quenching temperature is constant,as the tempering temperature increases,the hardness gradually decreases.Through the comparison of the structure and performance(hardness)of the sample after the quenching and tempering process,the heating process of the quenching and tempering heating process is optimized by heating up to 5h to 875℃,holding for 4h,then quenching,and then tempering at 550～575℃.The product structure and performance test produced by the optimized high temperature heating process and quenching and tempering heating process show that the improved heating process product structure is more uniform and refined,and the metallographic microstructure obtained is more uniform tempered sorbite.By optimizing the heating process and reducing the heating time,the production cost can be reduced by 35.1 yuan/ton,and it is estimated that the production cost will be saved at least about 1.75 million yuan/year.The product can meet the mechanical performance requirements and has stable performance,which provides technical support for the energy saving and performance guarantee of the product.