COMPLAS 2025

Finite Element Analysis for Forming In-plane Bent Parts Using Bending and Compression Processes

  • Muraoka, Tsuyoshi (Tokyo Metropolitan Industrial Technology Rese)
  • Okude, Yusuke (Tokyo Metropolitan Industrial Technology Rese)
  • Katagiri, T. (Tokyo Metropolitan Industrial Technology Research Institute)
  • Kajikawa, Shohei (The University of Electro-Communications)
  • Kuboki, Takashi (The University of Electro-Communications)

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This study presents the effect of forming conditions on the formed shape of an in-plane bent part forming method that utilizes bending and compression processes by using finite element analysis. In-plane bending parts are used as busbars, edge-wise coils, and other conductive components. To place conductors in a space-saving manner, parts must have a small bending radius and a high cross-sectional ratio. However, in-plane bending with a small bending radius and high cross-section ratio caused out-of-plane twisting and buckling because the out-of-plane bending stiffness is lower than the in-plane bending stiffness, and low-yield forming methods such as laser processing or punching are used. In this study, “Bending and Compression Method (BCM)” is proposed as a forming method for in-plane bent parts. In BCM, bars are subjected to compression after bending. BCM can form a small bending radius by bending a circular cross-sectional material with a low cross-sectional secondary moment and can form a high cross-sectional ratio because the cross-sectional ratio is formed by compressive deformation with relatively high deformability. In this report, the effects of forming conditions such as amount of compression, bending angle, cross-sectional area of material, and friction coefficient on forming shapes such as bending radius and cross-sectional shape in BCM were investigated by finite element analysis. The analysis shows that the bend radius increases by compression and the friction coefficient has a dominant effect on the bend radius.