Transactions of Materials and Heat Treatment

Title：Influence of mandrel parameters on NC bending forming quality for high strength thin-wall tube

Authors： Chen Qian Lei Junxiang

Unit： University of Shanghai for Science and Technology

KeyWords： thin-walled tube NC bending mandrel parameter wall thinning cross section distortion

ClassificationCode：TG386

year,vol(issue):pagenumber：2016,41(11):158-163

Abstract：

Flexible mandrel is a key factor that influences the forming quality of thin-walled tube in NC bending process. A finite element model of NC bending process for high strength thin-walled tube was established by FE software Dynaform, and its reliability was verified by experiment. It was studied that the influential regularities of the mandrel parameters, such as mandrel and tube clearance, ball mandrel number, ball mandrels and tube clearance, and mandrel and tube friction condition, on the thickness change and the cross section distortion in NC bending process. Results show that with the increase of the mandrel and tube clearance, the wall thinning rate decreases, and the cross section distortion has little increase, and the mandrel and tube clearance mainly affects the bending end position. With the increase of ball mandrels number, the wall thinning rate has a tendency to increase, but the cross section distortion is reduced. With the increase of the ball mandrels and tube clearance, the wall thinning rate decreases, while the cross section distortion increases. The smaller the friction between mandrel and tube internal is, the more the wall thinning rate decreases.

Funds：

陈钱（1990-），男，硕士研究生雷君相（1957-），男，博士，教授

Reference：

［1］杨合，林艳，孙志超. 面向21世纪的先进塑性加工技术与管成形研究发展[A].中国科学技术协会.西部大开发科教先行与可持续发展——中国科协2000年学术年会文集[C].北京：中国科学技术协会，2000.Yang H, Lin Y, Sun Z C. The advanced plastic processing technology and tube forming research of the 21st century [A]. China Association for Science and Technology. Western Development Science and Education Ahead & Sustainable Development-2000 Academic Convention Corpus of China Association for Science and Technology [C]. Beijing: China Association for Science and Technology, 2000.
［2］Yang H, Li H, Zhang Z Y,et al. Advances and trends on tube bending forming technologies[J]. Chinese Journal of Aeronautics, 2012,25(1):1-12.
［3］Li H, Yang H, Song F F, et al. Springback nonlinearity of high-strength titanium alloy tube upon mandrel bending[J]. International Journal of Precision Engineering and Manufacturing, 2013, 14(3):429-438.
［4］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 J, Lu S Q, Wang K L, et al. FE analysis of section distortion in numerical control bending of the 0Cr21Ni6Mn9N stainless steel tube[J]. Journal of Plasticity Engineering, 2013,20(5):71-76.
［5］林兵兵，徐雪峰，王高潮，等. 薄壁管数控绕弯成形壁厚减薄的主要影响因素研究[J]. 锻压技术，2016，41(1)：131-136.Lin B B, Xu X F, Wang G C，et al. Research on main influential factors of wall thinning in NC thin-walled tube rotary-bending process[J]. Forging & Stamping Technology, 2016，41(1):131-136.
［6］申世军，杨合，李恒，等.薄壁管小弯曲半径数控绕弯成形芯模效用的实验研究[J]. 塑性工程学报，2007，14(4)：29-34.Shen S J, Yang H, Li H，et al. Experimental study on mandrel of NC bending process with small bending radius thin-walled tube[J]. Journal of Plasticity Engineering, 2007，14(4):29-34.
［7］Strano M. Automatic tooling design for rotary draw bending of tubes[J]. The International Journal of Advanced Manufacturing Technology, 2005, 26(7):733-740.
［8］Ho S J, Jong W J, Man Y H，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(12):2143-2148.
［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 X M, Lu S Q, Fang J，et al. Influence of mandrel extension length on NC bending forming quality of 0Cr21Ni6Mn9N stainless steel tube[J]. Forging & Stamping Technology, 2014，39(5):73-77.
［10］Wu C, Yan Y, Hu Z L. Effect of mandrel on the forming quality of thin walled tube[J]. Hydro Mechatronics Engineering, 2015，43(12):52-59.
［11］徐建美，王克鲁，方军，等. 间隙对0Cr21Ni6Mn9N不锈钢管材数控弯曲截面质量的影响[J]. 锻压技术，2014，39(5):132-137.Xu J M, Wang K L, Fang J，et al. Effect of clearance on cross section quality of 0Cr21Ni6Mn9N stainless steel tube in NC bending process[J]. Forging & Stamping Technology, 2014，39(5):132-137.
［12］方军，鲁世强，王克鲁，等. 管模间隙对21-6-9高强不锈钢管数控绕弯成形质量的影响[J]. 北京理工大学学报，2015，35(9)：886-891.Fang J, Lu S Q, Wang K L，et al. Effect of clearance between tube and dies on forming quality in NC bending process of high strength 21-6-9 stainless steel tube[J]. Transactions of Beijing Institute of Technology, 2015，35(9):886-891.
［13］叶福民，章威，冯露，等. 薄壁圆管绕弯芯棒参数的数值模拟和实验研究[J]. 现代制造工程，2013，(10)：73-78.Ye F M, Zhang W, Feng L，et al. Numerical simulation and experimental studies of the mandrel parameters in the thin-walled pipe rotary bending[J]. Modern Manufacturing Engineering, 2013，(10):73-78.

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