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Improvement strategy for edge waviness in roll bending process of corrugated sheet metals

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Abstract

This paper focuses on the corrugated thin-walled sheet metal in the roll bending process. The main defect that appears in corrugated panels subjected to high amounts of bending deformation is a wavy edge. Edge defects are caused by excessive longitudinal stress and strain near the edge of the plate, and local edge buckling may occur when some critical value of the bending radius is exceeded. This paper proposes two different approaches to avoid a wavy edge for a formed panel: excessive stress on the edge region is restrained by controlling the length of the cross-sectional end of the corrugated panel while considering the stress distribution, and the bending radius in each forming step is determined by considering the strain limit at which the initial edge waviness occurs to avoid excessive compression at particular steps. The experimental and numerical results indicated that the two proposed design strategies can minimize wavy edges in the formed shape.

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Acknowledgments

This work is supported by the Korea Institute of Industrial Technology (KITECH) under Grant Number ER150020 and by the Ministry of Strategy and Finance (MOSF). The authors express their sincere gratitude to the MOSF for providing financial support.

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Authors and Affiliations

  1. Green Manufacturing Process Technology Center, KITECH, Wolchul-dong, Gwangju, 500-460, South Korea

    Do-Sik Shim

  2. Department of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 500-757, South Korea

    Jong-Youn Son, Eun-Mi Lee & Gyeong-Yun Baek

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  1. Do-Sik Shim
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  2. Jong-Youn Son
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  3. Eun-Mi Lee
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  4. Gyeong-Yun Baek
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Correspondence to Do-Sik Shim.

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Shim, DS., Son, JY., Lee, EM. et al. Improvement strategy for edge waviness in roll bending process of corrugated sheet metals. Int J Mater Form 10, 581–596 (2017). https://doi.org/10.1007/s12289-016-1303-x

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  • DOI: https://doi.org/10.1007/s12289-016-1303-x

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