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Hydrodynamic action in slicing PV polysilicon with a novel fixed and free abrasive combined wire sawing

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Abstract

This paper presents a novel fixed and free abrasive combined wire sawing which uses the diamond wire with surface abrasive-groups interval distribution and combines with free SiC abrasives slurry to obtain sliced surface that can be textured by acid etching. During the sawing process, the ability that the free abrasives lapping the sawn surface has a positive correlation with the elasto-hydrodynamic (EHD) pressure, and the appropriate size of the free abrasives is related to the minimum film thickness of the cutting coolant. In this paper, the EHD action during the FFACWS is analyzed, and the film thickness equation and Reynolds equation of the sawing area are deduced. The influences of feed speed, wire speed, wire tensioning force, cutting coolant viscosity, core wire diameter, and surface structure parameters on EHD pressure and film thickness are analyzed, which provides theoretical reference for selection of the free abrasives diameter and analysis of their lapping effect on the slice surface. The research results show that the EHD pressure changes periodically in the direction of the wire axis in the entire sawing area. The change period is the same as a structural change period of the abrasive area (AA) and the bare wire area (BWA) on the wire surface. In one period, there are two EHD pressure peaks. The size range of free abrasives should be greater than the protruding height of the fixed abrasives on the diamond wire and less than the minimum film thickness in BWA, so that the free abrasives can be constrained in BWA to lap the slice surface.

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Funding

The work is financially supported by the National Natural Science Foundation of China (No.51875322), Natural Science Foundation of Shandong Province, China (No.ZR2019MEE012), and Project for Scientific Research Innovation Team of Young Scholar in Colleges and Universities of Shandong Province (2020KJB001).

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Authors and Affiliations

  1. Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MOE, School of Mechanical Engineering, Shandong University, Jinan, 250061, China

    Tianzhao Pu, Yufei Gao, Youkang Yin & Liyuan Wang

  2. National Demonstration Center for Experimental Mechanical Engineering Education, Shandong University, Jinan, 250061, China

    Yufei Gao

Authors
  1. Tianzhao Pu
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  2. Yufei Gao
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  3. Youkang Yin
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  4. Liyuan Wang
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Contributions

All authors participated in the work of the paper. Tianzhao Pu: methodology, writing—original draft preparation, data curation, formal analysis, visualization; Yufei Gao: conceptualization, methodology, writing - review and editing, project administration, funding acquisition, supervision; Youkang Yin: writing - review and editing; Liyuan Wang: validation. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Yufei Gao.

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Pu, T., Gao, Y., Yin, Y. et al. Hydrodynamic action in slicing PV polysilicon with a novel fixed and free abrasive combined wire sawing. Int J Adv Manuf Technol 114, 509–523 (2021). https://doi.org/10.1007/s00170-021-06895-w

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  • DOI: https://doi.org/10.1007/s00170-021-06895-w

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