材料力学性能对管材数控绕弯成形时壁厚变化的影响
Effects of Material Mechanical Properties on Wall Thickness Variation in Numerical Control Rotary Draw Bending Process of Tubes
摘 要
基于ABAQUS/Explicit有限元平台, 建立了规格为15.88 mm×0.84 mm的21-6-9高强不锈钢管数控绕弯成形三维弹塑性有限元模型并验证了模型的可靠性;然后采用该模型通过有限元模拟研究了不锈钢力学性能变化对管材数控绕弯成形时壁厚变化率的影响。结果表明: 弯管的壁厚变化率随着不锈钢强度系数、硬化指数的增大或屈服强度的降低而减小, 弹性模量和泊松比对壁厚变化率基本没有影响; 壁厚变化率对力学性能的敏感性由大到小依次为强度系数、硬化指数、屈服强度、弹性模量、泊松比。
壁厚
管材数控绕弯
mechanical property
wall thickness
numerical control rotary draw bending of tube
Abstract
Based on the platform of ABAQUS/Explicit, a three-dimensional elastic-plastic finite element model of the numerical control (NC) rotary draw bending of 21-6-9 high strength stainless steel tube with the specification of 15.88 mm×0.84 mm was established, and the reliability of the model was validated. Then the effects of mechanical properties of the stainless steel on the wall thickness variation rates during the NC rotary draw bending were investigated by finite element simulation with the established model. The results show that the wall thickness variation rate of the bend tube decreased with the increase of strength coefficient and hardening exponent or with the decrease of yield strength of the stainless steel, while elastic module and Poisson′s ratio had little influences on the wall thickness variation rates. The sensitivity of the wall thickness variation rate to material mechanical properties was from high to low in the order of strength coefficient, hardening exponent, yield strength, elastic module and Poisson′s ratio.
中图分类号 TG386 DOI 10.11973/jxgccl201604017
所属栏目 物理模拟与数值模拟
基金项目 江西科技师范大学自然科学科研计划重点项目(300098010501)
收稿日期 2015/7/12
修改稿日期 2015/11/8
网络出版日期
作者单位点击查看
备注方军（1984-）, 男, 江西上饶人, 讲师, 博士。
引用该论文: FANG Jun,LU Shi-qiang,WANG Ke-lu,MIN Xu-guang. Effects of Material Mechanical Properties on Wall Thickness Variation in Numerical Control Rotary Draw Bending Process of Tubes[J]. Materials for mechancial engineering, 2016, 40(4): 75～79
方军,鲁世强,王克鲁,闵旭光. 材料力学性能对管材数控绕弯成形时壁厚变化的影响[J]. 机械工程材料, 2016, 40(4): 75～79
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【4】TANG N C.Plastic-deformation analysis in tube bending［J］.International Journal of Pressure vessels and Piping,2000,77(12): 751-759.
【5】E D X,CHEN J,DING J,et al.In-plane strain solution of stress and defects of tube bending with exponential hardening law［J］.Mechanics Based Design of Structures and Machines: An International Journal,2012,40(3): 257-276.
【6】LIU K X,LIU Y L,YANG H.Experimental study on the effect of dies on wall thickness distribution in NC bending of thin-walled rectangular 3A21 aluminum alloy tube［J］.International Journal of Advanced Manufacturing Technology,2013,68(5): 1867-1874.
【7】LI C,YANG H,ZHAN M,et al.Effects of process parameters on numerical control bending process for large diameter thin-walled aluminum alloy tubes［J］.Transactions of Nonferrous Metals Society of China,2009,19(3): 668-673.
【8】田玉丽,杨合,李恒,等.6061-T4大直径薄壁管数控弯曲壁厚变化实验研究［J］.材料科学与工艺,2012, 20(2): 23-29,34.
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【10】方军,鲁世强,王克鲁,等.工艺参数对21-6-9高强不锈钢管数控弯曲壁厚减薄影响的显著性分析［J］.中国机械工程,2015,26(9): 1233-1238,1277.
【11】PENG Y H,TANG D,LI D Y.Study on the influence of mandrel type on copper tube rotary draw bending［J］.International Journal of Materials and Product Technology,2008,32(4): 406-422.
【12】LI H,YANG H,YAN J,et al.Numerical study on deformation behaviors of thin-walled tube NC bending with large diameter and small bending radius［J］.Computational Materials Science,2009,45(4): 921-934.
【13】ZHAN M,JIANG Z Q,YANG H,et al.Numerically controlled bending performance of medium strength TA18 titanium alloy tubes under different die sets［J］.Science China Technological Sciences,2011,54(4): 841-852.
【14】JEONG H S,JEON J W,HA M Y,et al.Finite element analysis for inconel 625 fine tube bending to predict deformation characteristics［J］.International Journal of Precision Engineering and Manufacturing,2012,13(8): 1395-1401.
【15】刘树勋,刘宪民,刘蕤,等.0Cr21Ni6Mn9N奥氏体不锈钢的应变强化行为［J］.钢铁研究学报,2005,17(4): 40-44.
【16】方军,鲁世强,王克鲁,等.0Cr21Ni6Mn9N不锈钢管数控弯曲截面畸变有限元分析［J］.塑性工程学报,2013,20(5): 71-76.
【17】方军,鲁世强,王克鲁,等.21-6-9高强不锈钢管数控弯曲回弹对材料参数的敏感性［J］.西安交通大学学报,2015,49(3): 145-151.
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