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Experiment Study of Rapid Laser Polishing of Freeform Steel Surface by Dual-Beam

School of Intelligent Manufacturing and Equipment, Shenzhen Institute of Information Technology, Shenzhen 518172, China
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Coatings 2019, 9(5), 324; https://doi.org/10.3390/coatings9050324
Received: 28 April 2019 / Revised: 11 May 2019 / Accepted: 13 May 2019 / Published: 16 May 2019
(This article belongs to the Special Issue Surface Treatment by Laser-Assisted Techniques)
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Abstract

One of the challenges regarding widespread use of parts made from alloy steel is their time-consuming polishing process. A rough freeform surface of part has been often expected to be polished rapidly up to a smooth surface finish. The focus of this study is to develop a fast polishing method of freeform surface by using dual-beam lasers. The dual-beam laser system consists of continuous laser (CW) and pulsed laser based on a five-axis CNC device. In this study, a series of experiments of CW laser polishing present the effects of different spot irradiation on surface topography, then the combination trajectory of zigzag and square waveform of pulsed laser is explored to realize a “melting peak for filling into valley” (MPFV) method. The polishing experiment on a semisphere of S136H steel polished by dual-beam shows that a rough semisphere surface was rapidly polished from initial state value of Sa (=877 nm) to post-polished value of Sa (=142 nm), and the polishing efficiency is as high as 2890 cm2/H. View Full-Text
Keywords: dual-beam; beam shaper; MPFV method; laser polishing; zigzag-square wave dual-beam; beam shaper; MPFV method; laser polishing; zigzag-square wave
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Zhou, Y.; Zhao, Z.; Zhang, W.; Xiao, H.; Xu, X. Experiment Study of Rapid Laser Polishing of Freeform Steel Surface by Dual-Beam. Coatings 2019, 9, 324.

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