塑性と加工
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
論文
FEM によるPW パンチの穴抜き面凹凸の改善メカニズムの解析
松野 崇栗山 幸久米澤 翔太村上 碩哉大竹 尚登
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ジャーナル フリー

2012 年 53 巻 620 号 p. 836-841

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Numerical simulation by a finite element method investigated the mechanism of roughness improvement in pierced holes using a press working (PW) punch. Two types of simulation, i. e. piercing and crack conjunction, were performed. Piercing simulation suggested that the PW punch suppresses both the generation and propagation of a crack in a sheet material around the punch edge because of the suppression of plastic strain localization, but promotes the generation and propagation around the die edge because of the high stress triaxiality induced. This result implies the suppression of the mismatch of the two cracks by the dominant crack from the die edge. Crack conjunction analysis based on bifurcation and stress triaxiality showed that crack mismatch increases the unevenness of a fracture area of pierced surfaces.

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© 2012 一般社団法人 日本塑性加工学会
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