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利用有限元模拟软件ABAQUS建立了0Cr21Ni6Mn9N不锈钢管材的数据弯曲、抽芯及回弹全过程有限元模型,并对其可靠性进行了验证;研究了芯棒伸出量e对横截面畸变、壁厚变化、起皱趋势和回弹角的影响规律。结果表明,随着芯棒伸出量的增大,管材横截面畸变率和回弹角减小,当芯棒伸出量大于2.5 mm时,管材出现“鹅头”现象;外侧壁厚减薄率随着芯棒伸出量的增大而增大,内侧壁厚增厚率随着芯棒伸出量的增大而有所减小,但减小趋势不明显;弯管内侧起皱趋势随着芯棒伸出量的增大先减小后增大;最后获得了合适的芯棒伸出量范围为1.5~2 mm。
The finite element model of bending, core pulling and springback of 0Cr21Ni6Mn9N stainless steel pipe was established by finite element simulation software ABAQUS, and its reliability was verified. The effects of mandrel extension e on cross-sectional distortion, wall thickness Change, the trend of wrinkling and rebound angle of the law. The results show that with the increase of mandrel elongation, the distortion rate and rebound angle of the pipe decreases. When the mandrel extension exceeds 2.5 mm, the pipe appears “goose head” phenomenon; the outer wall thickness The rate of thinning increases with the extension of the mandrel, while the thickening rate of the inner wall thickness decreases with the extension of the mandrel, but the decreasing trend is not obvious. The trend of wrinkle decreases first and then increases with the increase of the mandrel extension. Finally, the suitable mandrel extension range is 1.5-2 mm.