Study On Residual Stress And Wear Behavior Of Induction Hardening Ball Screw

With the continuous development of the modern machinery manufacturing industry,especially the rapid development of precision CNC machine tools,high-end machining centers and other equipment,the processing precision and performance requirements for ball screws are also increasing.The ball screw with the working conditions such as continuous contact stress and high rotation speed usually needs to withstand bending,impact and twisting.At the same time,the ball screw also has to withstand strong friction between the ball screw and ball,resulting the main forms of damage with contact fatigue and wear failure.Therefore,improving the hardness and wear resistance of the ball screw raceway is of great importance to ensure the comprehensive mechanical properties,especially the precision retention and dimensional stability.In this paper,the surface induction quenching of ball screw with GCr15 steel and 55 steel was performed through optimized induction quenching process parameters,respectively,and then the microstructure,phase composition,microhardness and residual stress were also examined.By means of the linear dry sliding wear test,the friction coefficient,wear volume,and microscopic appearance of the wear surface are characterized.The influence of microstructure,induction quenching residual stress and wear load on the wear mechanism and wear resistance has been systematically studied.It is expected to provide theoretical and technical support for the precise control and wear resistance of ball screw.The systematic research shows that:(1)The residual compressive stress induced by induction hardening can suppress the initiation and propagation of microcracks,and then delay the detachment of blocky or flake-like wear debris,thereby improving the wear resistance of the material.(2)The change of the wear load affects the fluctuation of the wear mechanism.Under the low wear load,the main wear mechanism of GCrls steel and 55 steel is abrasive wear.With the increase of load,the wear mechanism is mainly transformed into delamination wear.(3)The work hardening layer of 55 steel produced during the wear process can reduce the friction coefficient,thereby improve the antifriction property of the material.(4)After induction hardening,the 55CrMo steel obtained reasonable residual compressive stress distribution.It is proved that the chemical composition of the material has a important influence on the distribution of induction hardening residual stress.