0Cr18Ni9管材大曲率无芯弯曲横截面畸变研究
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摘要
为了提高管材弯曲成形性及弯曲精度,基于ABAQUS有限元平台,建立了管材大曲率无芯弯曲有限元模型,模拟了管材大曲率无芯弯曲过程,研究了弯曲角、弯曲速度以及初始管材壁厚对管材大曲率无芯弯曲横截面椭圆畸变的影响,同时进行了相关实验验证。结果表明:模拟与实验结果吻合较好,各弯曲条件下二者误差均在一合理范围内,验证了有限元模型的可靠性;最大横截面短轴变化率随弯曲角度及弯曲速度的增大而增大,随管材初始壁厚减小而增大;弯曲角度及管材初始壁厚对最大横截面短轴变化率影响较大而弯曲速度对其影响相对较小;通过选择合适的弯曲工艺,可弯制出满足要求的大曲率弯管。
In order to improve the bending formability and bending accuracy of tube,a finite element model was established based on the ABAQUS finite element platform,and the bending process of large curvature and no-mandrel of the tube was simulated.The effect of bending angle,bending speed and initial wall thickness of tube on elliptical distortion of cross section with large curvature and no-mandrel bending process for 0 Cr18 Ni9 tube was studied.At the same time,the experimental verification was carried out.The results show that the simulation results are in good agreement with the experimental results,and the errors under all bending conditions are within a reasonable range,which verifies the reliability of the finite element model.The maximum cross section minor axis variation rate increases with the increase of bending angle and bending speed,while increases with the decrease of initial wall thickness of tube.The bending angle and the initial wall thickness of tube have a great influence on the maximum cross-section short axis variation rate,while the bending speed has a relatively small influence on it.By selecting suitable bending process,the qualified bent tube with large curvature can be produced.
In order to improve the bending formability and bending accuracy of tube,a finite element model was established based on the ABAQUS finite element platform,and the bending process of large curvature and no-mandrel of the tube was simulated.The effect of bending angle,bending speed and initial wall thickness of tube on elliptical distortion of cross section with large curvature and no-mandrel bending process for 0 Cr18 Ni9 tube was studied.At the same time,the experimental verification was carried out.The results show that the simulation results are in good agreement with the experimental results,and the errors under all bending conditions are within a reasonable range,which verifies the reliability of the finite element model.The maximum cross section minor axis variation rate increases with the increase of bending angle and bending speed,while increases with the decrease of initial wall thickness of tube.The bending angle and the initial wall thickness of tube have a great influence on the maximum cross-section short axis variation rate,while the bending speed has a relatively small influence on it.By selecting suitable bending process,the qualified bent tube with large curvature can be produced.
引文
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[2]LI H,YANG H,ZHAN M,et al.Role of mandrel in NC precision bending process of thin-walled tube[J].International Journal of Machine Tools&Manufacture,2007,47(7-8):1164-1175.
[3]LI H,YANG H,ZHAN M,et al.Deformation behaviors of thinwalled tube in rotary draw bending under push assistant loading conditions[J].Journal of Materials Processing Technology,2010,210(1):143-158.
[4]LI H,YANG H.‘Size effect’related bending formability of thinwalled aluminum alloy tube[J].Chinese Journal of Aeronautics,2013,26(1):230-241.
[5]LIU J Y,TANG C T,NING R X.Deformation calculation of cross-section based on virtual force in thin-walled tube bending process[J].Chinese Journal of Mechanical Engineering,2009,22(5):696-701.
[6]寇永乐,杨合,詹梅,等.薄壁管数控弯曲截面畸变的实验研究[J].塑性工程学报,2007,14(5):26-31.KOU Yongle,YANG He,ZHAN Mei,et al.Experimental study on cross-section ovalization of thin-walled tube in NC bending process[J].Journal of Plasticity Engineering,2007,14(5):26-31.
[7]OLIVEIRA D A,WORSWICK M J.Tube bending and hydroforming of aluminium alloy S-rails[J].International Journal of Material Forming,2009,2(3):197-215.
[8]FANG J,LU S Q,WANG K L.Effect of mandrel on cross-section quality in numerical control bending process of stainless steel 2169small diameter tube[J].Advances in Materials Science and Engineering,2013,(6):1-9.
[9]许小妹,鲁世强,方军,等.芯棒伸出量对0Cr21Ni6Mn9N不锈钢管数控弯曲成形质量的影响[J].锻压技术,2014,39(5):73-77.XU Xiaomei,LU Shiqiang,FANG Jun,et al.Influence of mandrel extension length on NC bending forming quality of0Cr21Ni6Mn9N stainless steel tube[J].Forging&Stamping Technology,2014,39(5):73-77.
[10]方军,鲁世强,王克鲁,等.0Cr21Ni6Mn9N不锈钢管材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.FANG Jun,LU Shiqiang,WANG Kelu,et al.FE analysis of section distortion in numerical control bending of the 0Cr21Ni6Mn9Nstainless steel tube[J].Journal of Plasticity Engineering,2013,20(5):71-76.
[11]王永伟,鄂大辛,苏旭军,等.弯管横截面椭圆畸变的试验及有限元分析[J].汽车工艺与材料,2009,(5):37-39.WANG Yongwei,E Daxin,SU Xujun,et al.Experimental and finite element analysis of elliptical distortion of cross section of bent tube[J].Auto Mobile Technology&Material,2009,(5):37-39.
[12]鄂大辛,周大军.金属管材弯曲理论及成形缺陷分析[M].北京:北京理工大学出版社,2016.E Daxin,ZHOU Dajun.Metal tube bending:theory and forming defects analysis[M].Beijing:Beijing Institute of Technology Press,2016.
[13]李恒,杨合,詹梅,等.薄壁管数控弯曲成形过程管材/模具间隙的作用机理[C]//第二届全球华人先进塑性加工技术研讨会论文集.西安,2005:91-93.LI Heng,YANG He,ZHAN Mei,et al.Effect mechanism of clearance between tube and dies during NC bending process of thinwalled tube[C]//The 2nd Seminar on Advanced Plastic Processing Technology for Global Overseas Chinese.Xi'an,2005:91-93.