Influence Of Abrasive Grain Arrangement Of Abrasive Belt On Quality For Robotic Grinding

With the development of machinery manufacturing industry,micro-nano and nanoscale abrasive grinding technology has become the trend of industry development.Traditional abrasive belts have random abrasive distribution and uneven cutting edge height,which has been difficult to meet the current requirements of precision machining manufacturing.Therefore,the development direction of manufacturing technology has turned to improve the grinding performance of abrasive belts,and the abrasive grain arrangement of abrasive belts is one of the important indexes to evaluate the surface morphology of abrasive belts,and also has a profound impact on the surface processing quality of workpieces.The orderly arrangement of abrasive grains keeps the distance of abrasive grains to a certain extent.During grinding process,each abrasive grains interfere with each other,which effectively reduces the fluctuation of workpiece surface contour and obtains a smaller surface roughness.At the same time,the chip capacity and heat dissipation capacity of the abrasive belt surface are increased to effectively prevent surface burns and thus improve the surface quality of the workpiece.In this paper,through theoretical model establishment,ABAQUS simulation analysis and Titanium alloy abrasive polishing test,the influence of abrasive grain arrangement on the quality of robot abrasive belt polishing is revealed.Firstly,the mathematical model of abrasive belt polishing is established.Establish the removal depth model and roughness model of abrasive material of abrasive belt,study and summarize the mathematical models of abrasive grain distribution of pyramid abrasive belt,electrostatic plant abrasive belt and common accumulation abrasive belt,and further derive the abrasive grain trajectory equation of three abrasive belts,which lays a foundation for roughness simulation.Secondly,simulation analysis of abrasive belt abrasion and polishing is carried out.The ABAQUS software is used to simulate and analyze the removal depth,surface morphology and roughness of three kinds of abrasive belts with different abrasive grain arrangement.The key links,such as geometric model establishment,material constitutive equation,chip separation quasi-measurement,friction model and meshing,are described in detail.Finally,the platform of robotic abrasive belt grinding system is established,and the experiment of robotic abrasive belt grinding titanium alloy is carried out by using pyramid abrasive belt,electrostatic plant abrasive belt and common accumulation abrasive belt(abrasive grain arrangement is from order to disorder).The influence of abrasive grain arrangement on surface morphology is analyzed in detail,and the influence rule of surface roughness and removal depth of workpiece grinded and polished by pyramid abrasive belt on polishing pressure and grain size of abrasive.The results show that the surface morphology of the workpiece ground by abrasive ordered abrasive belt is better,the surface texture is finer and the roughness value is smaller.Grinding test of different grinding pressure and pyramid abrasive belt with different grain size proves that with the increase of grinding pressure,the surface roughness and material removal depth of workpiece increase;With the increase of grain size of abrasive belt,the particle size decreases,and the surface roughness and material removal depth of workpiece decreases.The test is consistent with the theoretical and simulation trends,and the data fitting is very well.