Abstract
The surface quality and subsurface damage (SSD) distribution achieved with a fine-grained grinding wheel under different depth-of-cut and cutting speed is experimentally studied. The ground surface roughness (SR) is investigated via white light interferometry and expressed in terms of four typical roughness values (PV, RMS, Rz, and Ra). The SSD is characterized by the magnetorheological finishing (MRF) spot method and transmission electron microscopy. The results show that brittle-ductile surfaces and ductile-like surfaces are generated during ultra-precision grinding. Largely due to plastic flow removal, fracture defects such as fractured pits and grinding streaks on the ground surface can be mitigated. Instead, a ductile-like surface covered with grinding streaks is found. When the depth-of-cut decreases from 4 to 1 μm, the SR and SSD depth decreases from PV 1.34 μm, Ra 15.23 nm, Rz 0.94 μm, RMS 22.24 nm, and SSD 6.1 μm to PV 0.51 μm, Ra 5.07 nm, Rz 0.24 μm, RMS 6.70 nm, and SSD 1.2 μm. In addition, when the cutting speed increases from 3.9 to 23.4 m/s, the SR and SSD depth decreases from PV 1.03 μm, Ra 15.01 nm, Rz 0.82 μm, RMS 21.43 nm, and SSD 5.6 μm to PV 0.12 μm, Ra 3.17 nm, Rz 0.07 μm, RMS 4.65 nm, and SSD 0.003 μm. Moreover, the material removal mechanism under different grinding parameters is revealed by calculating undeformed chip thickness, and the mechanism of surface morphology and subsurface crack produced in brittle-ductile mode is analyzed. A linear relationship between the SR and SSD depth is in accord with the formula SSD = 0.41Ra−0.68 for brittle-ductile surfaces.
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We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript.
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This research was funded by the National Natural Science Foundation of China (NSFC) (No. 51991374, No. 51835013, and No. U1801259), National Key R&D Program of China (No. SQ2020YFB200368-04), Strategic Priority Research Program of the Chinese Academy of Sciences (No. XD25020317), the Excellent Youth Project of Educational Committee of Hunan Province of China (No. 20B067) and the Science and Technology Innovation Program of Hunan Province (2020JJ5617).
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Conceptualization, Yifan Dai; Investigation, Yaoyu Zhong; Methodology, Yaoyu Zhong and Hang Xiao; Supervision, Yifan Dai and Feng Shi; Validation, Feng Shi and Hang Xiao; Visualization, Yaoyu Zhong; Writing, Yaoyu Zhong.
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Zhong, Y., Dai, Y., Xiao, H. et al. Experimental study on surface integrity and subsurface damage of fused silica in ultra-precision grinding. Int J Adv Manuf Technol 115, 4021–4033 (2021). https://doi.org/10.1007/s00170-021-07439-y
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DOI: https://doi.org/10.1007/s00170-021-07439-y