Experimental Studies And Simulation Of Heat Characteristics In Intermittent Feed High Speed Grinding Of Titanium Alloy

Titanium alloy as a typical difficult processing material,which easily cause adhesion and blockage of grinding wheel surface and burn of workpiece due to its extremely poor mechanical properties when grinding.Therefore,this paper proposes a new technology of Intermittent Feed High Speed Grinding(IFHSG).The grinding process is realized through the intermittent feeding of the worktable.In this paper,the experiment,theoretical analysis and numerical simulation were used to carry out the process experiment and the study on the cooling mechanism of TC4 titanium alloy material in intermittent feed speed grinding.The main research work and the results are as follows:1)The research systematically carry out the experimental research of titanium alloy material in intermittent feed high speed grinding,and deeply analyze the influence of process parameters on grinding temperature and grinding force.The results show that the grinding temperature and the grinding force increase with the increase of the grinding depth a_p and the single feed distance of the worktable S_f,and the grinding temperature increases with the increase of the grinding wheel speed v_s,but the grinding force decreases first and then increases.The grinding wheel speed v_s has the greatest influence on the grinding temperature and the grinding force.2)Intermittent feed high speed grinding has obvious advantages over traditional high speed grinding titanium alloy.Under the same process parameters,the grinding temperature and grinding force are greatly reduced,the surface of the grindin g wheel has good surface morphology and the adhesion and blockage phenomenon is greatly relieved.After grinding the machined surface micro-morphology of the workpiece is fine without pits and cracks,and the surface roughness and the quality is improved.3)The research thoroughly explores the reason for the effective cooling in intermittent feed high speed grinding from the mechanism.On the one hand,due to the the short distance of single grinding,the single cutting volume is fewer and the grinding force is smaller than the continuous grinding,so the grinding temperature is accordingly reduced with the smaller heat flux on the grinding arc.On the other hand,as the grinding wheel retreats in time,the grinding fluid fully enters the grinding area,and the surface temperature is cooled to near room temperature.4)The research constructs the temperature field of TC4 titanium alloy in intermittent feed high speed grinding.The curve of the single point grinding temperature varies with the time is made up of many"pulse"wave peaks.The grinding temperature constantly increases and decreases with the time.The simulation results match greatly with the test results,and verify the reasonableness of the finite element grinding temperature model.5)The research investigates surface integrity of TC4 titanium alloy and probes into the influence of process parameters on surface roughness and surface micro-topography of titanium alloy.It was found that the surface roughness first descends and then increases with the increase of the grinding wheel speed and the single feed distance,and the surface roughness increases with the increase of the grinding depth,and the machined surface roughness is kept within 0.6?m after grinding.In conclusion,the new technology of the intermittent feed high speed grinding has achieved certain achievements in the processing of titanium alloy.To a certain extent,it is an effective grinding technology that has improved the processing efficiency and processing quality with lower cost.