Numerical Simulation And Experiment Study On The Surface Micro-texturing With Laser Pulse

Recently,surface micro-texturing technic is developed rapidly for its excellent improving friction performance as the demand of important friction-units rises.Laser surface micro-texturing (LST), should be the most advanced as it provides excellent ability to control and optimize the parameters of regular concavo-convex asperity.It is suitable for such a technic which was applied to the friction-units working face.It is very important to design and process the micro-texturing successfully according to the lubricating and wear resist performance.In this paper, topography machining in laser surface micro-texturing is analysed in detail,so is the machining quality optimization.First of all,physical theory of Interactions between laser-beam and materials was investigated,and maths model was established.It is the basics of numerical simulation.Second,numerical simulation for temperature field and crater on the laser ablation in laser surface micro-texture is performed with FEM(Finite-elment-method) software ANSYS.The numerical model based on energy conservation equation,take into account of Gauss distribution of the incident incident laser pulse in space and time.The influence and change regulation of laser intensity, laser pulse number,pulse duration,wavelength and materials on the crater was analyzed in detail. The simulation results concluded the best laser intensity in laser-pulse and materials interactions on certain conditions,and the best pulse duration on nanosecond laser micromachining.Furthermore,residual stress and thermal stress was also analysed,as a result,parameter effection on stress was confirmed.Practical machining woulde be guided by the result.The microcrack on the target could be prevented by optimizing the parameters of laser pulse,at least,could be reduced.At last,two experiments were carried out,laser pulse duration and pulse number's effection on crater.The simulated results are compared with the experiment results .The formers accord well with the latters .It did say,numerical simulation is feasible and reliable.