Transactions of Materials and Heat Treatment

Title：Stretch-bending process for butt truss with Von Karman curve

Authors： Wang Yanqin Zhang Jiegang Gu Chunjie Wang Dong Ma Kai Qin Xuelong Liang Lidong

Unit： Tianjin Aerospace Long March Rocket Manufacturing Co. Ltd. Capital Aerospace Machine Co. Ltd.

KeyWords： Von Karman curve stretch-bending stretch-bending force wrap angle compensate stretching amount forming accuracy

ClassificationCode：TG386

year,vol(issue):pagenumber：2022,47(2):126-131

Abstract：

With the development of new type rockets, in order to improve the aerodynamic performance of certain launch vehicles in flight, the shape of fairing is changed from a straight line to a Von Karman curve. However, the “convex” shaped butt truss with Von Karman curve is located in a certain device of fairing, and the curvature and bottom flatness are out of tolerance during the production. Therefore, in order to solve this problem, an experimental study was carried out on the stretch-bending process of parts, and through comparing and analyzing the influences of the three process parameters, such as stretch-bending force, wrap angle and compensate stretching amount on the accuracy of curvature and bottom flatness for part, the optimal value ranges of process parameters were obtained as the stretch-bending force of 95 kN, the wrap angle for the left side of 18°and the right side of 19.5°,the compensate stretching amount of 140 mm，respectively. The results show that the precision of the formed part by these process parameters is that curvature＜1.2 mm, bottom flatness＜1 mm, and the design requirements are met. Thus, the forming method and process parameters of the part provide production experience for the profile part with Von Karman curve.

Funds：

作者简介：王妍琴（1987-），女，硕士，工程师,E-mail：1124337718@qq.com

Reference：

[1]李耀民.卫星整流罩设计与三化[J].导弹与航天运载技术,1999,(2)：1-11.

Li Y M. Satellite fairing design and systematization，standardiza-tion and combination[J]. Missiles and Space Vehicles, 1999，（2）：1-11.

[2]董文源.CZ-4运载火箭新型卫星整流罩[J].上海航天,1993，（2）：47-48，52.

Dong W Y. New type satellite fairing of CZ-4 launch vehicle[J].Aerospace Shanghai, 1993,(2)：47-48,52.

[3]张智.中国新型运载火箭长征-2F[J].国际太空,2002，（12）：14-17.

Zhang Z.China new launch vehicleLong March-2F[J]. International Space,2002，（12）:14-17.

[4]尹苹,张杰刚,陆云鹏,等.冯·卡门曲线型材拉弯成形技术研究[A]．2010 年航天工艺信息网学术交流会论文集[C].武夷山,2010．

Yin P, Zhang J G, Lu Y P, et al．Reach on stretch bending process of aluminum extrusion with Von Karman curve[A]．The Academic Exchange of the Aerospace Technology Information Net-work in 2010[C].Wuyishan,2010.

[5]金朝海,周贤宾,刁可山,等.矩形截面铝合金型材拉弯成形有限元模拟[A].第八届全国塑形加工学术年会论文集[C].北京，2002.

Jin C H, Zhou X B, Diao K S, et al. Springback analysis for stretch bending of aluminum profile of rectangle cross section [A]. Proceedings of the 8th National Plastic processing Academic Annual Conference[C].Beijing,2002.

[6]李倩,张杰刚,马凯,等.钝角型材框位移控制模式拉弯成形工艺研究[J].锻压技术,2020,45（11）：106-111.

Li Q, Zhang J G, Ma K, et al．Stretch-bending process of profile frame with obtuse angle under displacement control mode [J]. Forging & Stamping Technology, 2020,45（11）：106-111.

[7]刁可山,周贤宾, 金朝海.铝合金型材拉弯成形研究进展[J]．塑性工程学报,2003，10（6）：38-41.

Diao K S, Zhou X B, Jin C H. The study on stretch-bending process for aluminum extrusions[J]．Journal of Plasticity Engineering,2003，10（6）：38-41.

[8]金春凤,吴璟.型材拉弯成形性的研究进展[J].机械工程与自动化,2010,160（3）：211-212.

Jin C F, Wu J．Study on stretch-bengding process for aluminum profile[J]. Mechanical Engineering & Automatiom, 2010,160（3）：211-212.

[9]金春凤.型材拉弯成形及回弹分析[D]. 成都：西华大学, 2009.

Jin C F. The Stretch Bending Forming and Spring-back Analysis of Extrusions[D]. Chengdu： Xihua University,2009.

[10]金淼,周贤宾,李晓星,等.大尺寸封闭截面铝型材拉弯工艺研究[Ｊ]. 塑性工程学报,2003,10（6）:46-49.

Jin M, Zhou X B, Li X X, et al．Stretching bending for aluminum profile with large dimension section[J].Journal of Plasticity Engineering,2003,10（6）:46-49.

[11]李倩，郭慧，张杰刚,等.大角度型材框力和位移控制模式下的拉弯成形对比研究[J].锻压技术，2021,46(2):124-129.

Li Q,Guo H,Zhang J G, et al. Comparative study on stretch-bending by force and displacement control modes for lange-angle profile frame[J]. Forging & Stamping Technology,2021,46(2):124-129.

[12]张琨.大曲率型材拉弯成形过程的数值模拟[D].长春：吉林大学,2013.

Zhang K. Research on Stretch Bending Forming Process of Large Curvature Profile by Numerical Simulation[D]. Changchun:Jilin University, 2013.

[13]王敏.不锈钢车顶弯梁拉弯成形数值模拟[D].长春：吉林大学,2017.

Wang M. Numerical Simulation of the Stretch Bending Forming for the Stainless Steel Curved Beam[D]. Changchun:Jilin University, 2017.

Service：

【This site has not yet opened Download Service】【Add Favorite】