• Acta Optica Sinica
  • Vol. 40, Issue 8, 0824001 (2020)
Chaoqun Xu, Congfu Fang*, and Zhen Yan
Author Affiliations
  • College of Mechanical Engineering and Automation, Huaqiao University, Xiamen, Fujian 361021, China
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    DOI: 10.3788/AOS202040.0824001 Cite this Article Set citation alerts
    Chaoqun Xu, Congfu Fang, Zhen Yan. Design and Experimental Study of Double-Pattern Nonuniform Coupling Fixed-Abrasive Pads[J]. Acta Optica Sinica, 2020, 40(8): 0824001 Copy Citation Text show less

    Abstract

    Traditional fixed abrasive pads (FAPs) present difficulty in guaranteeing the workpiece machining quality in the lapping of hard and brittle materials owing to the single form of grooves fabricated on the pad surface. To address this problem, in this study, a new type of FAP design called DPP, which has a non-uniform coupling and spiral concentric structured pattern, was proposed and tested. To reduce debris blockage on the DPP surface, spiral grooves were used as chip disposal grooves to ensure that the machined workpiece surface had a lower roughness and thus prolonged DPP life. Moreover, concentric circular grooves were used to adjust the distribution of abrasives on the DPP surface, which can improve the material removal uniformity and surface flatness of the machined workpiece. Based on the proposed design principle, the DPP for sapphire lapping was fabricated and compared with a traditional grid grooved pad (GGP). Experimental results show that the number of pits and scratches on the machined workpiece surface is much fewer when using DPP, which is ~35% of that of GGP, and the degree of blockage of the DPP after lapping is lower, which is ~30% of that of GGP. In lapping with DPP, the material removal rate is ~14% lower than that of GGP, but the nonuniformity of material removal thickness is ~0.0494, which is 32% lower than that of GGP. The surface roughness is ~129.4 μm, which is ~16.2% lower than that of GGP. Therefore, when DPP is used for sapphire lapping, the distribution of material removal is more uniform and the surface quality of the workpiece is much better. The test results prove that DPP can not only facilitate better workpiece surface quality but also prolong the pad service life, which meets the efficient and precision machining requirements for high-quality surfaces and large-scale production of brittle and hard materials such as sapphire.
    Chaoqun Xu, Congfu Fang, Zhen Yan. Design and Experimental Study of Double-Pattern Nonuniform Coupling Fixed-Abrasive Pads[J]. Acta Optica Sinica, 2020, 40(8): 0824001
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