Modeling And Simulation And Experimental Study Of Fluid Field In Grinding Zone In Grinding Process

Grinding process is an important way of machining. In grinding, grinding fluid can play important roles in restraining temperature rise, reducing grinding wheel wear, preventing adhesion and improving the surface quality of the workpieces. Therefore, it is essential to study grinding fluid field in grinding process.Grinding fluid field under the grinding zone in floods and in oil-gas jet flow lubrication were studied in this thesis.The mathematical model of smooth grinding flow field based on fluid lubrication theory was setted up, and the numerical results of smooth model by means of multigrid technique was obtained. The results of calculation show that with circumferential velocity of grinding wheel increasing the hydrodynamic pressure increases. Changing diameter of grinding wheel, hydrodynamic pressure remained virtually unchanged. With minimum clearance between grinding wheel and workpieces decreasing, hydrodynamic pressure in grinding zone increases.The mathematical model of smooth grinding flow field was built based on smooth grinding model and real surface topography of grinding wheel and workpiece, and the numerical results of smooth model by means of multigrid technique was obtained. The numerical results show good correlation through comparing smooth model with rough model.In the experimental study of grinding, circumferential velocity of grinding wheel and minimum clearance that impacted hydrodynamic pressure were analyzed. Experimental results show that with circumferential velocity of grinding wheel increasing the hydrodynamic pressure increases. With minimum clearance between grinding wheel and workpieces decreasing, hydrodynamic pressure in grinding zone increases. The numerical results show good correlation with experiments qualitatively through comparing smooth model with experiments.Finally, MQL lubrication technique and oil-gas lubrication mechanism were introduced, and properties of grinding flow field in oil-gas jet flow lubrication were analyzed, and the mathematical model was built.