Research On Surface Integrity Of High Performance Gear Steel 8620H During Grindin

In order to study the surface integrity of high-performance gear steel 8620 H grinding,this paper uses a combination of theoretical analysis and grinding experiments to systematically study the grinding force,surface roughness,depth of metamorphic layer,microhardness,residual stress,etc.The variation law under different grinding parameters is analyzed,the machining defects of the workpiece surface and the wear pattern of the plane grinding head after grinding are analyzed,and the grinding process parameters are optimized.The surface integrity of high-performance gear steel 8620 H processed by ordinary grinding machine and ultrasonic-assisted grinding machine was comparatively studied;the influence of grinding with different mesh plane grinding heads on the surface quality of workpiece was analyzed;the use of different mesh grinding heads was studied.,the removal method of the workpiece surface material under the processing of ordinary grinder and ultrasonic-assisted grinder,and the wear mechanism of the plane grinder was studied by observing the wear morphology of the plane grinder.The research shows that the use of ultrasonic assisted grinding machine has little effect on the surface roughness and surface morphology of the workpiece;keeping other conditions unchanged,with the increase of the number of surface grinding heads,the surface quality of the workpiece becomes better;using grinding heads with different meshes,ordinary grinding machines The surface materials of the workpiece are removed by plastic forming under the processing of the ultrasonic-assisted grinding machine,and there are a small amount of broken chips on both sides of the scratch..The variation law of grinding stress and grinding temperature of high-performance gear steel 8620 H under the action of a single abrasive particle under the action of a single abrasive particle was studied by means of Deform-3D finite element software,and the abrasive particle wear was analyzed.The results show that the maximum equivalent stress of the workpiece is distributed in front of the abrasive grain feeding direction,and the grinding stress decreases with the increase of the abrasive grain cutting speed and the decrease of the grinding depth;and the maximum temperature of the grinding zone increases with the grinding With the increase of speed and grinding depth,the wear area of abrasive particles is mainly at the top of the abrasive particle cone,and shows a trend of slowly extending upward.Through single factor experimental grinding of high-performance gear steel 8620 H,the influence of single grinding parameters on the surface integrity of high-performance gear steel8620 H was systematically analyzed.The research shows that the grinding force decreases when the linear speed of the plane grinding head is increased,while the grinding force increases correspondingly when the grinding depth and the workpiece feed rate are increased.It can improve the surface quality of the workpiece and reduce the surface roughness of the workpiece,while using a larger grinding depth will destroy the surface quality of the workpiece,increase the surface roughness of the workpiece,and increase surface defects;under different grinding process parameters,after grinding The surface of 8620 H workpiece will produce work hardening and residual stress,and the residual stress is expressed as compressive stress;with the increase of grinding depth,the number of pits and grooves on the surface of the workpiece increases,the scratches are more obvious,and the surface quality deteriorates.The influence of different grinding process parameters on the surface integrity of high-performance gear steel 8620 H was studied.The range and variance analysis are carried out on the results of the grinding orthogonal experiment,and the primary and secondary factors affecting the grinding results are obtained as the grinding depth ap,the surface grinding head linear speed vs and the workpiece speed vw.The NSGA-Ⅱ algorithm is used to solve the multi-objective optimization model of surface roughness and machining efficiency,and the grinding process parameters are further optimized.