Title: Experimental study on the polishing of aspheric surfaces on an S-136 mould steel using magnetic compound fluid slurries

Authors: Youliang Wang; Jibo Gao; Ming Feng; Wenjuan Zhang; Xujie Zhang; Yongbo Wu

Addresses: School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China ' School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China ' Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China ' State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou, Gansu 730050, China ' School of Mechanical and Electronical Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China ' Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China

Abstract: S-136 (STAVAX ESR) as a mould material has been extensively used in the optical lens manufacturing industry. In this study, the aspheric surface made of S-136 fixed by a six-degree of freedom (DOF) manipulator was polished using magnetic compound fluid (MCF) slurry. The effects of experimental parameters included rotational speed of workpiece and MCF slurry composition on surface roughness Ra and shape retention were investigated. The results demonstrated that the cutting marks on the initial surface reduced obviously under the given experimental parameters. Therefore, the smoothest surface with Ra 20 nm was obtained with MCF3 containing micro-sized Fe₃O₄ particles with lower saturation magnetisation at n_w = 1,000 rpm. The material removes uniformly during the polishing process and the Pearson correlation coefficient (Pcc) of the aspheric surface was kept above 0.994. The MCF slurry polishing was demonstrated as a potential method to smooth the S-136 aspheric surface.

Keywords: S-136; aspheric surface; magnetic compound fluid; MCF; material removal; surface roughness.

DOI: 10.1504/IJAT.2020.112687

International Journal of Abrasive Technology, 2020 Vol.10 No.3, pp.155 - 169

Received: 03 Jul 2019
Accepted: 29 Jun 2020
Published online: 28 Jan 2021 *

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