Theoretical Modeling And Experiment Research On Grinding Force Of Grinding Wheel With Orderly-micro-grooves

The structure of grinding wheel and the characteristics of grains have an important influence on grinding efficiency and machining accuracy.this research group proposed a grinding wheel with orderly-micro-grooves,which improved the problem that the traditional grinding wheel grinding fluid was difficult to enter the grinding area for effective lubrication and cooling,and improved the chip-holding capacity.Grinding force is the key factor that affects the surface quality,specific energy,grinding temperature and wheel wear during the grinding process.Controlling the grinding force can effectively improve production efficiency and obtain better processing quality.The mathematical model of grinding force is helpful to understand the grinding mechanism,predict the grinding quality,and optimize the grinding parameters.Based on this,a mathematical model of the grinding force of an electroplated CBN grinding wheel with orderly-micro-grooves was established in this paper,and the model is mainly aimed at plastic materials.Grinding experimental research was carried out,the degree of agreement between the established theoretical model of grinding force and reality was discussed,and orderly-micro-grooves were studied.Grinding performance of structural electroplated grinding wheel,the main research contents are as follows:(1)The theoretical model of grinding force of electroplated grinding wheel with orderlymicro-grooves was established.The interference mechanism of abrasive particles/workpiece was deeply analyzed,and the Rayleigh probability density distribution function was introduced to define the randomness of undeformed chip thickness.Then,an undeformed chip thickness model was established.The friction force,ploughing force and cutting force in the grinding zone were explored,and the theoretical model of single grain grinding force was built.Based on the influence of the micro-groove structure on the grinding force,the actual contact arc length between grinding wheel and workpiece was explored,and the dynamic cutting edge density was deduced from the static grain distribution density.A grinding force model of electroplated grinding wheel with orderly-micro-grooves based on the actual topography of grinding wheel was established.The theoretical value of grinding force was calculated by Matlab,and the proportion of each component of grinding force in the total grinding force and the changing trend with grinding parameters were explored.It was found that the cutting force accounted for the largest proportion.(2)The grinding verification experiment research was carried out,and explored the variation law of grinding force.The electroplated CBN grinding wheel with orderly-microgrooves was prepared,and the grinding experiments of hardened bearing steel were carried out.The comparative experiment of traditional grinding wheel was carried out,the influence of micro-groove structure on grinding force was explored,and the change trend of grinding force under dry and wet grinding conditions was compared and analyzed.The results showed that the grinding force of the electroplated grinding wheel with orderly-micro-grooves was smaller than that of the traditional electroplated grinding wheel.(3)The grinding performance of the grinding wheel with orderly-micro-grooves was explored,and the mechanical behavior of grinding material removal was studied.The deformation mechanism of the material in the chip-forming zone was analyzed,and it was found that there were a first deformation zone and a second deformation zone in the chipforming zone.The influence law of grinding force on the wear of the grinding wheel was explained.The surface quality of workpiece ground by grinding wheel with orderly-microgrooves and traditional grinding wheel was compared and analyzed,and the influence of the micro-groove structure of the grinding wheel on the grinding quality was studied.The results showed that the roughness of the micro-grooved grinding wheel was slightly larger than that of the traditional grinding wheel in the dry grinding state,and the grinding quality of the micro-grooved grinding wheel was significantly improved under the wet grinding condition.