Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Influence of Drawing Speed and Blank Holding Force in Rectangular Drawing of Ultra Thin Sheet Metal

극박판 사각 드로잉에 있어서 드로잉속도와 블랭크홀딩력의 영향

  • 이준형 (서울과학기술대학교 NID융합기술대학원) ;
  • 정완진 (서울과학기술대학교 기계시스템디자인공학과) ;
  • 김종호 (서울과학기술대학교 기계시스템디자인공학과)
  • Received : 2012.06.26
  • Accepted : 2012.08.07
  • Published : 2012.10.01
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Abstract

Micro-drawn parts have received wider acceptance as products become smaller and more precise. The subject of this study was the deformation characteristics of ultra thin sheet metal in micro drawing of a rectangular shaped part. The influence of drawing speed and blank holding force on the product quality was investigated in micro-drawing of ultra thin sheet of beryllium copper (C1720) alloy. The specimen had a diameter of 4.8 mm and a thickness of $50{\mu}m$. Experiments were carried out in which, different blank holding force and drawing speed were considered. The product quality was evaluated by measuring the thickness and hardness along two specified directions, namely, the side and diagonal directions. The distribution of the thickness strain showed severe thinning especially around the punch radius in both directions. In the diagonal direction, thickening occurred in the flange area due to the axi-symmetric drawing mode. The increase of blank holding force and/or drawing speed was found to cause severe thinning around the punch radius. The blank holding force had a greater effect on thinning of the product than the drawing speed.

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References

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