Grinding Force Modeling And Experimental Analysis Based On Axial Feed Grinding Of Hard And Brittle Materials

The prediction of the grinding force of hard and brittle materials has an important impact on the quality requirements of manufacturing companies.With the development of the manufacturing industry,various hard and brittle materials with excellent properties are frequently used in industrial production processes.The stable grinding processing system will directly affect the processing accuracy of hard and brittle materials.As an important indicator to measure the grinding process,grinding force is very important for its research.In recent years,with the joint efforts of experts at home and abroad,the modeling research on the grinding force of hard and brittle materials has achieved fruitful resultsAfter reviewing and summarizing the previous achievements in the modeling of grinding force of hard and brittle materials,this paper finds that for the modeling of the grinding force of hard and brittle materials tools,traditional methods of end face grinding and simulation are used,and few literatures consider The effect of specific actual working conditions on grinding force.However,in the actual machining process,the grinding of hard and brittle material tools is specifically the axial feed end face grinding,which is different from the traditional end face grinding Therefore,a mathematical model of grinding force based on the axial feed of hard and brittle materials is established in this paper,and the effectiveness of the model is verified by grinding experiment of Si₃N₄ ceramics and cemented carbide,and then the grinding force is analyzed by different process parameters,and the effect on the surface quality of the processed workpiece.The main research contents are as followsFirstly,the brittle-plastic transition mechanism of hard and brittle materials is studied.This paper analyzes the process of single abrasive grains cutting hard and brittle materials,and divides the brittle-plastic transformation of hard and brittle materials into three stages:plastic deformation removal,brittle plastic mixed removal and brittle fracture removal.The geometric model of is derived the analytical expression of the critical undeformed chip thicknessSecondly,a grinding force model based on the axial feed of hard and brittle materials was established,and its stable boundary was determined The grinding process of hard and brittle materials can be roughly divided into three stages:sliding,ploughing and cutting deformation.Based on this,the grinding force generated by the axial feed grinding of hard and brittle materials is divided into shafts.The three spatial components of tangential chip deforming force,tangential chip deforming force and tangential sliding force are combined with specific chip energy and material constitutive to find these three grinding force components to complete the mathematical modeling of grinding force.In order to further perfect the established grinding force model,this article limits the process parameters that affect the grinding force,and obtains the boundary conditions for the stable operation of the grinding process systemFinally,Experimental analysis of the established grinding force model The effectiveness of the grinding force model established in this paper is verified through experiments,and the influence of process parameters on the grinding force and the surface quality of the processed workpiece is further analyzed.It is concluded that the grinding force is inversely proportional to the rotation speed of the grinding wheel and proportional to the axial feed speed of the grinding wheel,and the selection of the optimal process parameters based on the surface quality of the machined workpiece grinding Si3 N4 ceramics.