<第 50 号記念特集>電縫管成形プロセスの有限要素シミュレーション

概要

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Deformation features of sheet metals (SUS304) being formed by breakdown and fin-pass rolls in a mill to produce a circular welded pipe (60.5mm in external diameter, 3.0mm wall thickness) are discussed with reference to experimental measurements and results calculated using the three-dimensional rigid-plastic finite-element method. The peak value of the decreasing in wall thickness of sheet metal formed by W-bend forming roll (No. 1 breakdown roll) is found at the edge portion. This decreasing in wall thickness which takes place at the outer edge of sheet metal is caused by the contact between outer edge and bottom roll. This edge deformation can be fairly reduced by introducing a proper pre-forming process for edge-bending. The peripheral distribution of outer curvature along the edge portion of sheet metal formed by U-bend forming roll (No.2 breakdown roll) is found to be affected by the bending imposed on the center portion of sheet metal by W-bend forming roll. The peak value of the increasing in wall thickness of sheet metal formed by each pair of fin-pass rolls is found at a portion adjacent to sheet edge. This peak value increases with an increase in peripheral reduction. Calculated results are in good agreement with measured results.
山梨大学の論文