Study For The Mechanism Of Grinding Friction Reducing Surface By End Face Grinding Wheel

Structured surfaces can effectively reduce friction on contact surfaces and reduces drag resistance in fluids.For manufacturing an ideal structured surface,Researchers have adopted imprinting,chemical etching,laser,cutting and grinding methods.However,when dealing with the manufacture of difficult-to-machine material parts or mass production of parts,the method above,Either there are inefficiencies,or there are problems such as high costs and pollution.Compared with other manufacturing methods,The grinding method has unique advantages in solving the above problems.In order to grinding structured surfaces by end face grinding wheels,three kind of structured grinding wheel was designed,such as grinding wheel with abrasive array pattern,stagger pattern and abrasive phyllotactic pattern.Based on the movement regularity of end face grinding wheels and the grinding wheels with different abrasive pattern the kinematic equations of end-face grinding was established.Combined with abrasive grain movement trajectories,the effect of kinematic parameters and arrangement of abrasive grain on surface topography of workpiece was analyzed.The conditions for generating a regular surface platform were studied.Based on the kinematic equations of grinding wheels with three different abrasive pattern,a simulation was carried out on different surface topography of workpiece ground by the grinding wheel with abrasive array pattern,stagger pattern and phyllotactic pattern.The effect of arrangement parameters and kinematic parameters and uniform of protrusion height of abrasive particles on surface topography was analyzed.Since the uniform of abrasive protrusion height of grinding wheels related with the quality of structured surface,processing measures to produce grinding wheels with uniform protrusion height of abrasive particles was provide.Grinding wheel with abrasive array pattern,abrasive stagger pattern and abrasive phyllotactic pattern with uniform protrusion height of abrasive grains was produced by masking-glue method.The simulation results show that the size of plateau on the workpiece surface ground by the grinding wheel with abrasive phyllotactic pattern change evenly.The bearing ratio of the workpiece surface decrease evenly when the distance between workpiece and grinding wheel with abrasive phyllotactic pattern increase.In the areas on both sides of the workpiece relative to the center of the grinding wheel,the large platform grinded on the workpiece surface by the grinding wheel with array pattern becomes smaller,and the large platform grinded on the workpiece surface by the wheel with staggered pattern becomes smaller.When the circumferential equal fractions and the ratio between grinding wheel speed and feed rate change,the size of plateau on the workpiece become evenly.When distance between the grinding wheel and workpiece change,The bearing ratio of workpiece surface ground by the grinding wheel with abrasive array pattern and staggered pattern changed wavely.The bearing ratioof workpiece surface decreaces with the increasing of the rotating speed of grinding wheel.The difference of the grain protrusion height of abrasive grains on the grinding wheel surface influnces the quality of generated structured surface.