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CSME 2024/10
Volume 45 No.5
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435-443
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Surface Finish of a Stainless Steel Using a New Ball Polishing Tool on a CNC Turning Center
Fang-Jung Shioua, Chang-Mou Wub, Shi-Han Honga and Wei-Cheng Huanga
aDepartment of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 106335, ROC.
bDepartment of Material Science and Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan 106335, ROC.
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Abstract:
A new ball polishing tool that can be mounted on the turret of a CNC turning center has been developed, to perform the precision surface finish of the STAVAX stainless mold steel. To simplify the conventional ball polishing with a slurry container, the lab-made polishing balls mainly composed of the NBR silicon rubber, the abrasive of aluminum oxide, and the silicon oxide have been developed and used. Five type of polishing balls with different abrasive grain sizes and concentration, from type A to type E, have been figured out, tested and fabricated. The developed polishing balls have been adopted to perform the surface finishing on the CNC turning center, to improve the surface roughness of the burnished STAVAX stainless mold steel. The effects of the number of passes using the lab-made polishing balls on the surface roughness improvement have also been investigated. According to the experimental results on the hexahedron surfaces, the polishing ball of type E, with grain size of 3 μm and concentration of 40%, has the best surface roughness improvement; and the best ball polishing passes combination were: E-C-B-A. Applying the suitable parameters of ball burnishing and ball polishing processes to the test workpiece with a keyway, the surface roughness improvement from Ra 0.21 μm to Ra 0.02 μm could be obtained. Using these suitable parameters to the workpiece with a cam profile, the improvement on the surface roughness form Ra 0.206 μm to Ra 0.03 μm could be obtained.
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Keywords: ball burnishing, ball polishing, lab-made polishing ball, CNC turning center, Surface roughness, STAVAX stainless mold steel.
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*Corresponding author; e-mail: shiou@mail.ntust.edu.tw
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©
2024
CSME , ISSN 0257-9731
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