pulsed laser micro polishing ppt
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Pulsed laser micropowder (PLμP) has been shown to be an effective method for polishing micro-metallic parts whose surface roughness can be approximated to the size of the characteristic. The duration of the laser pulse in the PLμP process is an important parameter that significantly affects the attainable surface finish. This paper describes the influence of laser pulse duration on the reduction of surface roughness during PLμP. For this purpose, near infrared laser pulses have been used to polish Ti6Al4V in three different pulse lengths: 0.65 μs, 1.91 μs and 3.60 μs. PLμP at higher pulse durations resulted in the dominance of Marangoni convective fluxes; however, significantly greater reductions in average surface roughness were observed compared to the short pulse duration regime without convection.


A fundamental study of pulsed laser polishing (PLμP) was carried out as a method to reduce the surface roughness of the metal parts of the micro / meso-scale. Although PLμP proved to be an effective process on these scales, knowledge of process physics was lacking in detail. The objective of this work was, therefore, to improve the existing knowledge on PLμP, focusing on the development of models based on physics, understanding the effects of several parameters of the process and developing strategies for the selection of process parameters and trajectories of laser.

The motivation for micro polished laser polishing is to reduce the roughness of the surface of the parts whose surface texture can approach the size of the feature. Being able to predict the magnitude of the polishing and the frequency (wavelength) of the surface content will help in the design of optimal processing parameters with minimal experiments. Laser pulses are used to create surface fusion pools with a controlled size (eg, depth) and duration to allow surface tension forces to "drag" roughnesses with a small radius of curvature. No ablation occurs in the process being modeled. The depth and duration of the melt is predicted with a transient two-dimensional axisymmetric heat transfer model with temperature dependent material properties. The surface of the fusion pool is analytically modeled as stationary capillary wave oscillations with damping resulting from the forces of surface tension and viscosity. Above a critical spatial frequency, a significant reduction in the amplitude of Fourier spatial components is expected. The work described in this paper extends the concept of critical frequency to a prediction methodology based on physics to predict spatial frequency content and surface roughness after polishing, given the characteristics of the original surface, the properties of the material and the Parameters of the laser. The proposed prediction methodology was validated using line polishing data for the results of 316L stainless steel polishing and surface polishing for pure nickel, Ti6Al4V and Al-6061-T6. The expected average surface roughness was within 12% of the values measured on the polished surfaces.
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