Modeling and Optimization of Laser Polishing Process

Abstract

Laser polishing is a finishing process based on melting material, with the objective of improving surface topography. Some operating parameters must be taken into consideration, such as laser power, feed rate, offset, and overlapping. Moreover, because of its dependence on the primary process, the initial topography has also an impact on the final result. This study describes a quadratic model, conceived to optimize final topography according to the primary process and laser polishing. Based on an experimental matrix, the model takes into account both laser operating parameters and the initial topography, in order to predict polished surfaces and to determine optimal set of parameters. After the phase of experimentation and the creation of the quadratic model, an optimal final topography is introduced, taking into account the initial surface and the laser parameters.

Influence of Overlap on Surface Quality in the Laser Polishing of 3D Printed Inconel 718 under the Effect of Air and Argon

“…In terms of CW-LP and zigzag strategy, the term "overlap" concerns the distance between parallel laser lines, while, in LµP, where pulsed lasers are used, the overlap value is also calculated along the scanning direction and, therefore, depends on the scanning speed, beam diameter, pulse rate frequency, and pulse duration [20,21]. Rosa et al showed that overlap is a vital parameter in the case of the optimization of the CW-LP process [22]. Bhaduri et al investigated the LP of 3D printed parts that were made of 316L steel [21].…”

A Novel Laser-Aided Machining and Polishing Process for Additive Manufacturing Materials with Multiple Endmill Emulating Scan Patterns

“…They identified the input thermal energy as the key parameter affecting melt pool convection and controlling the surface quality. Rosa et al [52] proposed a quadratic model taking into account the initial surface topography and polishing process parameters. Using the model, they predicted the polished surface quality and also experimentally determined the optimal parameters for polishing.…”