Simulation Prediction Of Deformation Of Spokes Of Thin-spoke Gears And Clamping Deformation Control Study

To meet the requirements of a lightweight transmission system for helicopters,the transmission gear as a key component of helicopter transmission is usually in the form of thin-walled spoke plate,but the thin-walled spoke plate structure in the cutting process will be deformation of the spoke plate,parallelism circumference deviation is too large and other problems,which will lead to gear hub area eccentricity caused by gear unbalance vibration.In this paper,we use finite element simulation,cutting principle and process optimization to investigate the causes of cutting deformation of thin-walled gears,analyze the main factors affecting cutting deformation,effectively predict the deformation of parts during cutting,formulate reasonable cutting deformation control strategy and optimize the process.parameters.The relevant research in this paper provides scientific theoretical guidance and process support for the turning processing of thin-walled gear spokes in aviation,which mainly includes.(1)Using ABAQUS finite element software,two-dimensional and threedimensional models for dynamic cutting simulation of medium carbon steel18Cr2Ni4 WA were established to analyze and obtain process parameters such as stress field,temperature field,cutting force and chip morphology of the workpiece after machining.(2)Single-factor cutting force measurement experiments with different cutting parameters were carried out to analyze the effects of different cutting parameters on the cutting force,and the experimental data were used to calibrate the simulation model,and finally the error between the simulation results and the experimental results was guaranteed to be within 15%.At the same time,the recalibrated simulation model was used to carry out orthogonal experiments,and the empirical equation of cutting force of18Cr2Ni4 WA medium carbon steel was obtained by fitting the multiple linear regression equation.(3)On the basis of ABAQUS software secondary development,the automatic load loading and unloading technology and the simulation deformation result data extraction technology are studied,and a thin-walled gear thin spoke plate machining deformation prediction model is proposed and experimentally verified to analyze the simulations to determine their accuracy.(4)The special tooling fixture was developed to determine different positioning and clamping positions and use different clamping solutions according to the special structure of the thin-walled gears themselves.The results show that the special fixture can reduce the deformation of the spoke plate.A finite element simulation model has been developed for the turning of thinwalled gear spokes of helicopters using the intrinsic structure model of the J-C helicopter,which truly and comprehensively reflects the dynamic mechanical properties of the material,to carry out the turning simulation under different parameters,to obtain the relevant data of force and heat,and to reveal the processing deformation law of thinwalled weakly rigid gear spokes.It provides effective theoretical guidance and practical significance for the anti-deformation processing of thin-walled weakly rigid gear spokes.