Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Prediction of Wrinkling in Micro R2R Forming and Its Improvement

마이크로 R2R 성형에서 주름의 발생 예측과 개선

  • 민병욱 (서울과학기술대학교 NID 융합대학원) ;
  • 서원상 (서울과학기술대학교 NID 융합대학원) ;
  • 김종봉 (서울과학기술대학교 자동차공학과) ;
  • 이혜진 (한국생산기술연구원 융합생산기술연구부) ;
  • 이상훈 (서울과학기술대학교 자동차공학과) ;
  • 김종호 (서울과학기술대학교 제품설계금형공학과)
  • Received : 2010.12.27
  • Accepted : 2011.01.24
  • Published : 2011.02.01
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Abstract

Recently, with the merits of simplicity, ease of mass production and cost effectiveness, a roll-to-roll (R2R) forming process is tried to be employed in the manufacturing of the circuit board, barrier ribs and other electronic device. In this study, the roll-to-roll process for the forming of micro-pattern in electronic device panel is designed and analyzed. In the preliminary experiments, two major defects, i.e., crack near the dimple wall and wrinkling on outside region of dimple, are found. The study on the crack prevention is carried out in previous works by authors. In this study, the cause of wrinkling and modification of tooling to prevent the wrinkling is studied. The main cause of wrinkling is considered to be the uneven material flow along the rolling direction. To reduce or to retard the wrinkling initiation, a dummy shape on outside the pattern is introduced. From the finite element analysis results, it is shown that the dummy shape can reduce the uneven material flow significantly. Finally the effect of dimensions of the dummy shape on material flow is investigated and the optimum dimensions are found.

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References

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