Transactions of Materials and Heat Treatment

Title：Research on main influential factors of wall thinning in NC thin-walled tube rotary-bending process

Authors： Lin Bingbing1 Xu Xuefeng1 Wang Gaochao1 Li Lingling2 Zhao Shuang2 Xu Long2

Unit： 1.School of Aviation Manufacturing Engineering Nanchang Hangkong University Nanchang 330063 China 2.AVIC Hongdu Aviation Industry Group Nanchang 330024 China

KeyWords： wall thickness thinning NC bending thin-walled tube

ClassificationCode：

year,vol(issue):pagenumber：2016,41(1):131-136

Abstract：

For the complex physical process of outer wall thickness thinning easily occurred in thin-walled tube NC rotary-bending under action of multi-factors, a 3-D finite element model was established by Dynaform and its reliability was verified. It was studied the influential regularity of forming parameters, such as material parameters, pushing device, bending angle, relative bending radius, mandrel extension length and mandrel heads number on outer wall thickness thinning in NC thin-walled tube rotary-bending process. The results show that the wall thickness thinning ratio of aluminum alloy LF2M tube is higher than that of stainless steel 1Cr18Ni9Ti tube, while its cross-sectional distortion is less than that of 1Cr18Ni9Ti, and the wall thickness thinning ratio of tube with pushing device decreases about 5% compared with that without pushing device. Moreover, the thinning ratio of the outer wall increases gradually with the increase of bending angle and relative bending radius. Therefore, the mandrel extension length as well as mandrel balls number are also important factors to effect wall thickness thinning, the more mandrel extension length is, and the greater thinning of outer wall thickness is. Further, increasing the mandrel ball numbers can also increase thinning ratio of the outer wall thickness.

Funds：

国家自然科学基金资助项目（51405219）；中航工业产学研资助项目（BA201306321）

林兵兵（1990-），男，硕士研究生

Reference：

[1]杨合，孙志超，林艳，等.面向21世纪的先进塑性加工技术与管成形研究发展[J].塑性工程学报，2001,8（2）：86-88.

Yang H,Sun Z C,Lin Y,et al. Advanced processing technology and research progess on tube forming[J].Chinese Journal of Plasticity Engineering,2001,8(2):86-88.

[2]Lin Y，Yang H.Thin-walled tube precision bending process and FEM simulation[A]. Proceedings of the 4th International Conference on Frontiers of Design and Manufacturing[C].Beijing,2000.

[3]杜长城，王俊翔，陈杰富，等.锅炉弯管缠绕式冷弯成形工艺及回弹的数值模拟[J].四川大学学报:工程科学版，2008,40（6）：75-79.

Du C C,Wang J X,Chen J F,et al.Numerical simulation for twisting cold bending process and spring-back of boiler pipe[J].Journal of Sichuan University:Engineering Science Edition,2008,40(6):75-79.

[4]林艳，杨合，李恒，等.薄壁管数控弯曲过程中失稳起皱的主要影响因素[J].航空学报,2003,24（5）:456-461.

Lin Y,Yang H,Li H,et al.Influences of forming parameters on wrinkling in NC thin-walled tube bending[J].Acat Aeronautia Et Astuonautia Sinca.,2003，24(5):456-461.

[5]Gu R J，Yang H,Zhan M,et al.Effect of mandrel on cross section quality of thin-walled tube numerical controlled bending[J].Transactions of Nonferrous Metals Society of China,2005,15(6)：1264-1274.

[6]Jun F，Lu S Q，Wang K L.Effect of mandrel on cross-section quality in numerical control bending process of stainless steel 2169 small diameter tube[J]Advances in Materials Science and Engineering,2013,（6）:1-9.

[7]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.

[8]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）：132-136.

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）：132-136.

[9]Xu J，Yang H, Li H,et al.Significance-based optimization of processing parameters for thin-walled aluminum alloy tube NC bending with small bending radius[J]. Transactions of Nonferrous Metals Society of China,2012,22:147-156.

[10]Wen T.On a concept of rotary draw bend-die adaptable for bending tubes with multiple outer dimaters under non-mandrel condition[J].Jounal of Materials Processing Technology,2014,214:311-317.

[11]董湘怀.材料加工理论与数值模拟[M].北京：高等教育出版社，2005.

Dong X H.Materials Processing Theory and Numerical Simulation[M].Beijing:Higher Education Press,2005.

[12]王光祥，杨合，李恒，等.工艺参数对薄壁管数控绕弯成形质量影响的实验研究[J].机械科学与技术,2005,24(8):995-998.

Wang G X,Yang H,Li H,et al. Experiment study on the influence of processing parameters on forming quality of thin-walled NC bending tube[J].Mechanical Science and Technology,2005,24(8):995-998.

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