Finite Element Simulation And Application Of Surface Temperature And Deformation Of Grinding Workpiece

Grinding is widely used in aviation,shipping,military and other fields,the process is a large number of uneven grinding wheel surface,irregular distribution and different shapes of abrasive particles together to complete the cutting process.In order to achieve high precision and low surface roughness process requirements,compared with other processing processes,grinding to remove per unit volume of material requires higher energy input,these incoming energy in the form of grinding heat gathered on the workpiece surface,Local high temperature,resulting in thermal damage such as burn,softening,rupture,fatigue strength reduction and bending deformation due to residual stress,etc.,which seriously affect the surface accuracy,shape accuracy,surface quality and service life of the parts.In this study,the trace of abrasive particles acting on the surface of the workpiece is simplified as points and distributed on the surface of the workpiece.The finite element simulation of the grinding temperature,thermal deformation,mechanical plastic deformation and coupling deformation of the workpiece is carried out by using ANSYS Workbench on the number of points,spacing,workpiece material characteristics and grinding parameters.（1）The influence of distance and number of grinding grains on workpiece surface temperature was studied by finite element simulation.The trace of the interaction between abrasive particles and the workpiece was simplified as points array on the workpiece surface,and the heat flux and time were applied to the points in six kinds of materials.The influence of the distance and number of abrasive particles between grinding wheels on the workpiece surface grinding temperature was simulated by adjusting the distance and number of points,and the results were analyzed and compared with different materials to verify the accuracy.（2）The influence of thermal conductivity,specific heat capacity and density on grinding temperature was simulated by ANSYS Workbench.Materials were added to the material library and the thermal conductivity was set from 1W/（m·℃）to 70W/（m·℃）,the specific heat capacity from 100J/（kg·℃）to 1000J/（kg·℃）and the density from1000Kg·m^-3to 8500Kg·m^-3,the heat flux and time were applied to the single point heat source.The influence of the material characteristics on the grinding temperature was studied by simulation,and compare with parameters of metal materials and non-metal materials.（3）The effects of grinding parameters,grain spacing and quantity,and material properties on the thermal deformation,mechanical plastic deformation and coupling deformation of the workpiece were studied by finite element simulation.The tangential force and normal force are obtained by empirical formula,and the tangential force is brought into the heat distribution model of grinding zone to obtain the heat flux.According to the diameter and normal direction of the point,the heat flux and pressure are assigned to a single point to simulate the thermal deformation,mechanical plastic deformation and coupling deformation when a single abrasive particle does work on the surface of the workpiece,and the relationship between them is verified in four different materials.Under the condition of multi-abrasive grinding,the simulation research on the influence of the distance and quantity of abrasive grains on the surface thermal deformation,mechanical plastic deformation and coupling deformation and the relationship between them is carried out,and the comparison analysis is carried out to verify the accuracy.