塑性と加工
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
論文
ダイス傾斜押出し加工法による湾曲棒の成形解析
木原 茂文三好 峻佑白石 光信新川 真人
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ジャーナル フリー

2007 年 48 巻 552 号 p. 36-40

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抄録

The mechanisms responsible for the formation of rectangular and trapezoidal bars by an extrusion process in which dies are inclined at various angles were investigated using numerical simulations. The greater the die inclination angle or the aperture exit angle, the smaller the radius of curvature of the extruded bar. The calculated radius of curvature agreed well with the radius observed in experiments. The particle flow pattern, one of the outputs of the simulation, was used as a basis for investigating the mechanisms of curvature generation. When the die inclination angle was increased in the case of the extrusion of rectangular bars, the volume of dead metal increased, causing material flow in the plane perpendicular to the extrusion direction. This material flow gave rise to curvature of the extruded bar. It was also found that when the cross section was trapezoidal, the asymmetry of the container aperture caused differences in material flow velocity between the top and bottom portions; these differences affected the curvature.

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© 2007 一般社団法人 日本塑性加工学会
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