Study On The Influence Of Process Parameters On The Performance Of Laser Chemical Composite Polishing 304 Stsinless

Laser and chemical compound polishing combines laser polishing with chemical polishing,and has the advantages of high polishing efficiency,easy control of polishing rate,smooth polishing surface,etc.,and has been widely studied and applied.In this paper,the laser chemical compound polishing process was used to polish 304 stainless steel,and compares it with the polishing effect of water-assisted laser polishing 304.In this paper,water-assisted laser polishing experiments were carried out on 304 stainless steel using a yttrium aluminum garnet 1064 nm far-infrared laser.The surface roughness and surface height difference after polishing were measured.The influence of water layer thickness and laser parameters on the polishing effect of the material was analyzed by comparing the surface roughness and surface height difference during the experiment.After water-assisted laser polishing,the surface roughness Ra of the 304 stainless steel polishing area is reduced,the surface scratches and surface defects of the material are removed,and the metal surface is smoother.However,there is still blackening of the surface after polishing,which is related to the thermal effect of the laser.The experimental results show that the water layer thickness is 2mm,the laser power is 20 W,the scanning frequency is 100 times,the laser scanning speed is 800mm/s,and the laser polishing frequency is 200 kHz,the best polishing effect can be obtained,and the surface roughness Ra is 0.151μm.At the same time,the laser chemical composite polishing experiment of 304 stainless steel was carried out.The influence of laser parameters on polishing effect was analyzed by comparing the changes of surface roughness and surface morphology during the experiment.In laser chemical composite polishing,due to the coupling effect of laser and chemical corrosion,when laser irradiates the metal surface,the temperature of the polishing fluid increases rapidly and the light energy is absorbed and transformed into heat energy,thus accelerating the chemical reaction of the polishing fluid.The closer the polishing solution is to the material interface,the greater the temperature gradient.This breaking of the temperature balance produces strong convection,bringing more reactive ions to the reaction zone,and the reaction product is taken away from the reaction zone,so that the solution in the polishing zone is continuously updated,thus greatly increasing the chemical reaction rate.The experimental results show that when the laser power is 20 W,the number of scans is 140,the laser scanning speed is 800mm/s,and the laser repetition frequency is 200 kHz,the polishing effect is the best,and the surface roughness is 0.139μm.Compared to water-assisted laser polishing,laser chemical composite polishing can significantly reduce surface roughness while suppressing surface oxidation.After laser chemical compound polishing,the surface of 304 stainless steel is smooth,and the surface roughness is obviously reduced.Laser chemistry compound polishing technology can achieve more efficient and high quality surface polishing of 304 stainless steel.