Impact of initial surface parameters on the final quality of laser micro-polished surfaces

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Proceedings titleProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ConferenceMicromachining and Microfabrication Process Technology XVII, 24 January 2012 through 26 January 2012, San Francisco, CA
Article number824809
SubjectExperimental analysis; Finishing operation; H13 tool steel; Initial surface microgeometry; Laser-material interactions; Local minimums; Low power laser; Machined surface; Micro milling; Micro-fabrication technology; Polishing effects; Process parameters; Q switched Nd:YAG laser; Surface parameter; Thin layers; Top surface; Waviness; Composite micromechanics; Microanalysis; Microfabrication; Micromachining; Molten materials; Polishing; Surface roughness; Surface tension; Tool steel; Surfaces
AbstractLaser micro-polishing (LμP) is a new laser-based microfabrication technology for improving surface quality during a finishing operation and for producing parts and surfaces with near-optical surface quality. The LμP process uses low power laser energy to melt a thin layer of material on the previously machined surface. The polishing effect is achieved as the molten material in the laser-material interaction zone flows from the elevated regions to the local minimum due to surface tension. This flow of molten material then forms a thin ultra-smooth layer on the top surface. The LμP is a complex thermo-dynamic process where the melting, flow and redistribution of molten material is significantly influenced by a variety of process parameters related to the laser, the travel motions and the material. The goal of this study is to analyze the impact of initial surface parameters on the final surface quality. Ball-end micromilling was used for preparing initial surface of samples from H13 tool steel that were polished using a Q-switched Nd:YAG laser. The height and width of micromilled scallops (waviness) were identified as dominant parameter affecting the quality of the LμPed surface. By adjusting process parameters, the Ra value of a surface, having a waviness period of 33 μm and a peak-to-valley value of 5.9 μm, was reduced from 499 nm to 301 nm, improving the final surface quality by 39.7%. © 2012 SPIE.
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AffiliationNational Research Council Canada (NRC-CNRC); Automotive (AUTO-AUTO)
Peer reviewedYes
NPARC number21269470
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Record identifier882c87a4-6c7b-4018-9f0d-0cb9505a0247
Record created2013-12-12
Record modified2016-05-09
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