Analysis Of Thermal Mechanical Coupling Process Of Face Grinding Based On The Movement Trajectory Of Abrasive Grains

Grinding technology is a geometric precision promotion craft for micro-surface,which always plays a major role in industrial development.Compared with the traditional grinding technology,the face grinding is more automated and efficient in slices and plates' machining process.However,the uneven material removal and low flatness accuracy of workpiece surface can be found in the face grinding.Based on the above,the dynamic grinding force and dynamic grinding temperature field models are established on the basis of the movement trajectory of abrasive grains in this paper.Combined with the finite element method(FEM)results,The influence of machining parameters on the dynamic grinding force and the dynamic heat in machining is analyzed specifically,which provides a theoretical basis for improving surface geometric precision of workpiece.The main findings of this paper are as follows:(1)The modeling on the particle movement trajectory of face grinding is established,which is the input for obtaining the dynamic grinding force and thermal relaxation.The simulation is conducted due to the single grits'movement trajectory on the workpiece's surface firstly.The regulation of the single grit's movement trajectory with the speed ratio is analyzed accordingly.Afterwards,the movement trajectory of multiple abrasive grains and its position information on the workpiece's surface are both simulated and analyzed,which can be the input for obtaining the dynamic grinding force.(2)A dynamic grinding force model is established based on the particle movement trajectory during machining process.Firstly,the mathematical model for the force of a single abrasive particle is proposed.Then,the dynamic undeformed cutting thickness of multiple abrasive grains is simulated and analyzed.The dynamic grinding force for multiple abrasive grains is calculated.This part analyzes the influence law of grinding wheel speed,workpiece speed and feed speed on grinding force.(3)The dynamic grinding temperature field model is established based on the dynamic grinding force in the face grinding process.The dynamic heat flux of several grinding grains is simulated and analyzed.The finite difference method(FDM)is applied to construct a two-dimensional heat transfer model for face grinding.Afterwards,the dynamic grinding temperature field is solved.The influence of grinding wheel speed,workpiece speed and feed speed on dynamic grinding temperature field is analyzed.(4)The FEM is raised to verify the FDM results.FEM heat transfer model is constructed based on the obtained dynamic heat flux of multiple abrasive grains,Then the FEM model is loaded by heat flux and convective heat transfer load,The simulation results of dynamic grinding temperature field are compared with FDM's.For a further step,the influence law of machining parameters on dynamic grinding temperature field is clarified.In this paper,the dynamic grinding force and grinding temperature field models of multiple abrasive grains are established based on the movement trajectory of abrasive grains in the face grinding process.The FEM is used to verify the dynamic grinding temperature field obtained by FDM.The results show that the uneven distribution of dynamic grinding force and temperature field arises different removal amount of materials on the surface of the workpiece,which leads to low flatness accuracy of workpiece surface.The flatness accuracy of the workpiece can be improved by increasing the grinding wheel speed and decreasing the feed speed.This paper provides a theoretical basis for improving the geometric precision of the workpiece surface in the face grinding process.