Experiment Study And Numerical Simulation Of Laser Surface Micro-texturing On Different Materials

As the development of tribology theories and experimental research, surface tribological performance can be remarkably improve by processed texturing on the surface of the friction pair. Laser surface texturing (LST) was considered as the most successful ways in surface texturing because of its good performance such as high speed, non pollution and excellent control ability. The shape and size of the texturing are decided by the processing technology of LST, so it is important for processing the the texturing meeting the design requirementsBase on the research of pulse laser acting on materials, the crater and groove were processed with Nd: YAG laser system on the surface of the carbon tool steel, high speed steel, stainless steel, aluminum bronze and aluminum alloy.First, study the effects of laser wavelength, laser intensity and pulse Numerical on the topography of the caster. The changing trend diagrams of different materials were draw by experiment. there are different characteristics of different materials. The diameter and depth of the crater increase as the laser intensity increases on carbon tool steel, but they increase slowly. The crater depth almost linearly increases as the pulse count is under 8. Then the depth growth rate becomes slower and slower. When the pulse count is above 20, the quality of the crater is poor; The crater depth almost linearly increases as the pulse count on stainless steel; The crater depth increases parabolically as the pulse count on aluminum bronze; The depth of the crater almost linearly increases as the laser intensity increases on aluminum alloy.Second, the effects of laser intensity, laser frequency and scanning speed on the topography of the groove were studied. The depth and width of the groove increase as the laser intensity increases on different materials, but the increasing trends become slower and slower. The depth and width of the groove increase as the processing speed decreasing. But the residues of the groove are excessive when the processing speed is too slow. The groove depth of aluminum alloy is deeper. The one of stainless steel is shallower.In order to predict the processing effect and optimize the processing parameters, the model of laser process was built. The temperature of the pulse laser surface texturing under different laser intensities was simulated. The physical phenomenon was studied under different temperature. The topography of the texturing was gotten by killing or activating elements method. The effects of different processing parameters on topography of the texturing were studied. The simulation results were consistent with the experiment results, which demonstrated the rationality of the model. This research lays a foundation for laser machining micro-texturing in a rapid and effective way.