A Study on the Plastic Bending of Sheet Metals : 1st Report, The String Back of Sheet Metals

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  • 薄板の曲げ加工に関する研究 : 第1報, 薄板のスプリングバック
  • ウスイタ ノ マゲ カコウ ニ カンスル ケンキュウ 1

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Abstract

In the plastic bending of sheet metals, spring back is a well-knoun phenomenon as a very complex and difficult problem. In this report, the authors deal with experimentally the process of deformation in the plastic bending of sheet metals with the V-die and the punch and the effects of various factors on the spring back in the matter mentioned above. The results showed as follows : i) the process of deformation was divided into two main types, each of which had the respective change of spring back. ii) spring back was mainly influenced by bending load, but the degree of its influencedepended on the ratio of the radius R at the extreme point of punch to the thickness t of sheet metals. Moreover, authors tried to find a theoretical grounds on "spring back and go". The results obtained in the analysis well agree with the experiments.

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