Research On Friction And Wear Test Of Guide Rail Pair And Key Technology For Improving Wear Resistanc

In order to improve the wear resistance ability of linear ball guide,the friction and wear test of non preload linear ball guide was carried out in this paper.By analyzing the accuracy,rigidity and friction data,the wear resistance of linear ball guide is characterized,and the wear resistance differences of the test samples are compared.It is found that the kurtosis value of friction in time domain,the maximum amplitude in frequency domain and the envelope area of waveform can be used to characterize the wear resistance.Then,according to the observation of raceway morphology,abrasive particles and oil scraper,it is found that the damage of slider raceway is the key factor leading to the reduction of wear resistance of test guide rail pair,and the oil scraper is also worn.Compared with the auxiliary raceway,it is proposed that the key to improve the wear resistance is the smooth circulation of the ball and reduce the collision.Then construct the material wear test,and explore the wear resistance of different materials with the results of friction torque,wear amount and lubricating oil.It is found that the 42 Cr Mo sample with higher carbon content exudes more carbide and has higher wear resistance.It is proposed that the surface carbon concentration of slider material can be appropriately increased to make it exude more carbide,so as to improve the wear resistance.Finally,in order to improve the wear resistance of linear ball guide,combined with test and theoretical analysis,the maximum collision force,maximum contact stress and friction resistance are taken as the optimization objectives of wear resistance of linear ball guide.According to the design requirements,the constraint function of slider reaction force and the constraint range of structural parameters are determined.By analyzing the sensitivity of parameters,the initial contact angle,the curvature ratio of slider raceway,the increment of ball diameter and guide height are selected as design variables;Optimize the use of CCRD and Kriging response surface to build the agent model;Through NSGA-II algorithm,the optimal solutions of friction resistance optimization of 6.62%,maximum collision force optimization of 15.15%,and maximum contact stress increase of only 3.08% are obtained.Based on Spearman correlation,the relationship between the change mechanism of design variables of optimization results and the objective function of optimization model is analyzed.In the end,the wear resistance improvement scheme of reducing the ball diameter and adjusting the initial contact angle according to the loading direction is deduced.