汽车防护杠用大口径薄壁钢管绕弯成形工艺参数优化

发布时间：2018-06-06 14:35

本文选题：汽车防护杠 + 大口径薄壁管　；参考：《汽车工程》2015年07期

【摘要】：采用理论计算、数值仿真和实验相结合的方法探讨了材料、有无芯轴、芯头个数和芯棒伸出量对汽车防护杠用不锈钢管绕弯成形质量的影响。结果表明:相同工艺条件下,不锈钢SUS304管材比碳素钢Q235A更易产生截面畸变,但外侧壁厚减薄率较小;材料相同时,有芯轴支撑管材切向压应力和拉应力最大值的差值较小,材料流动更加均匀,能很好地抑制管材的截面畸变和失稳起皱;芯头个数是影响截面变形的最重要因素,芯头个数为3时,截面畸变率最小,其最大值仅为4.2%;芯棒伸出量过小,管材内侧容易起皱,截面畸变率较大;而伸出量过大时,管材外侧壁厚减薄严重,甚至导致拉裂;芯棒伸出量为9mm时,管材的弯曲成形质量最好。仿真结果与理论解析解和实测值吻合较好。
[Abstract]:The effects of materials, cored shafts, the number of core heads and the amount of mandrel outstretched on the forming quality of stainless steel tubes for automobile protective bars are discussed by means of theoretical calculation, numerical simulation and experiments. The results show that the cross section distortion of stainless steel SUS304 pipe is more easily than that of carbon steel Q235A, but the thinning rate of outside wall thickness is smaller, and the difference between the maximum tangential compressive stress and tensile stress of the tube with core-shaft support is smaller when the material is the same. The material flow is more uniform, which can restrain the cross section distortion and buckling of pipe, the number of core head is the most important factor to affect the section deformation, the ratio of section distortion is minimum when the number of core heads is 3, and the maximum value is only 4.2, and the mandrel extension is too small. It is easy to wrinkle on the inner side of the pipe, and the distortion rate of the section is large; when the amount of extension is too large, the thickness of the outer wall of the pipe is thinned seriously, and even lead to tension crack. When the mandrel outstretched is 9mm, the bending forming quality of the tube is the best. The simulation results are in good agreement with the theoretical analytical solution and the measured data.
【作者单位】：湖南大学汽车车身先进设计制造国家重点实验室;湖南大学机械与运载工程学院;浙江吉利汽车研究院有限公司;
【基金】：国家“十二五”科技支撑计划项目(2011BAG03B02) 国家自然科学基金面上项目(751229039) 湖南大学汽车车身先进设计与制造国家重点实验室自主课题项目(61075005) 长沙市科技重大专项(K1204008-11-1)资助
【分类号】：U466;TG306

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