管坯结构对小半径薄壁弯头内胀冷推弯成形的影响

详细信息    查看全文 | 推荐本文 |

英文篇名：Influence of tube blank structure on inner bulging and cold push-bending for thin-wall elbow with small radius 作者：付春林 ; 王宛山 ; 徐雪峰 英文作者：Fu Chunlin;Wang Wanshan;Xu Xuefeng;School of Mechanical Engineering and Automation,Northeastern University;School of Aviation Manufacturing Engineering,Nanchang Hangkong University; 关键词：小弯曲半径 ; 内胀冷推弯 ; 补偿角度 ; 内侧起皱 ; 数值模拟 英文关键词：small bending radius;;inner bulging and cold push-bending;;compensation angle;;inner wrinkling;;numerical simulation 中文刊名：DYJE 英文刊名：Forging & Stamping Technology 机构：东北大学机械工程与自动化学院;南昌航空大学航空制造工程学院; 出版日期：2019-01-25 出版单位：锻压技术 年：2019 期：v.44;No.280 基金：国家自然科学基金资助项目(51405219);; 中航工业产学研项目(BA201306321) 语种：中文; 页：DYJE201901017 页数：6 CN：01 ISSN：11-1942/TG 分类号：86-91

摘要

针对Ф40 mm×1 mm铝合金管材且弯曲半径为1倍管径的L形弯管成形,以数值模拟技术为平台,建立了内胀冷推弯有限元模型,研究了管坯端头不同补偿角度对弯管成形质量的影响。结果表明:补偿角度过大时,弯管内侧易产生压缩起皱,降低补偿角度则能有效防止弯管产生压缩起皱,且随着角度的降低,成形弯管减薄区域不断扩大,同时弯管弯曲内侧有效长度不断降低,易造成成形不足;补偿角度为45°时,起皱现象消失,外侧壁厚最大减薄率为7. 1%,整体成形质量较佳。以45°补偿角度进行内胀冷推弯试验,成形出符合要求的1倍弯曲半径弯管,且试验结果与模拟结果整体较吻合。
        For the forming of Φ40 mm × 1 mm aluminum alloy L-shape bending tube which the bending radius is one times the tube diameter,based on the numerical simulation software,the finite element model of inner bulging and cold push-bending was established,and the influences of different compensation angles of blank ends on the tube forming quality were studied. The results show that the wrinkling in the inner side of bending tube can be easily produced when the compensation angle is oversize,and a smaller compensation angle can effectively prevent the bending tube from producing wrinkles. Furthermore,with the decreasing of angle,the thinning area of the formed tube continues to expand,and the effective length of the inner side of bending tube is continuously reduced to cause insufficient forming easily. However,the wrinkling disappears when the compensation angle is 45°,the maximum reduction ratio of the outer wall thickness is7. 1%,and the overall forming quality is better. Finally,the inner bulging and cold push-bending experiment was conducted based on the45°compensation of angle,and the tubes with bending radius of one times the tube diameter that met the requirements were formed. The experiment results is coincident with the simulated results.

引文

[1]权晋花.薄壁小半径弯管与中压内胀成形工艺[J].锻压装备与制造技术,2009,44(3):103-105.Quan J H. Thin-walled tube with small radius and internal medium pressure forming technique[J]. China Metalforming Equipment&Manufacturing Technology,2009,44(3):103-105.
    [2]阮尚文,郎利辉,刘铮,等.多步管材充液成形技术在大胀形率复杂截面零件中的应用[J].锻压技术,2018,43(9):68-74.Ruan S W,Lang L H,Liu Z,et al. Application of multi-step tube hydroforming technology for parts with complex cross section[J]. Forging&Stamping Technology,2018,43(9):68-74.
    [3]曾元松,李志强.铝合金小弯曲半径管内压推弯成形过程的数值模拟[J].塑性工程学报,2003,10(2):14-17.Zeng Y S,Li Z Q. Numerical simulation of the internal pressure bending process of small bend radius aluminum alloy tubular parts[J]. Journal of Plasticity Engineering,2003,10(2):14-17.
    [4] Baudin S,Ray P,Mac Donald B J,et al. Development of a novel method of tube bending using finite element simulation[J]. Journal of Materials Processing Techonlogy,2004,153-154:128-133.
    [5] Zeng Y S,Li Z Q. Experimental research on the tube push-bending process[J]. Journal of Materials Processing Techonlogy,2002,122(2-3):237-240.
    [6]陆宏,田世伟,黄文,等.铝合金方形管件液压胀形成形性的有限元模拟和实验研究[J].锻压技术,2018,43(7):153-158.Lu H,Tian S W,Huang W,et al. Finite element simulation and experiment study on formability of hydro-forming for aluminum alloy square tube[J]. Forging&Stamping Technology,2018,43(7):153-158.
    [7]陈仕清.特薄壁金属管件填料推弯成形新工艺研究[D].大连:大连理工大学,2010.Chen S Q. Research on a New Process of Filler Push Bending for Very Thin Metal Tubes[D]. Dalian:Dalian University of Technology,2010.
    [8]张荣霞,吴为,曾元松. TA18钛合金导管的内径滚压连接工艺[J].锻压技术,2017,42(5):43-47.Zhang R X, Wu W, Zeng Y S. Internal rolling connecting on guide tubes for titanium alloy TA18[J]. Forging&Stamping Technology,2017,42(5):43-47.
    [9]刘琪,徐雪峰,付春林,等.带长直管的小弯曲半径薄壁弯头推弯成形实验研究[J].锻压技术,2018,43(5):62-67.Liu Q,Xu X F,Fu C L,et al. Experiment research on push-bending of thin-walled and small bending radius elbow with long straight tube[J]. Forging&Stamping Technology,2018,43(5):62-67.
    [10]陈清根,徐雪峰,王高潮,等.铝合金弯头冷推弯成形影响因素研究及工艺参数优化[J].塑性工程学报,2015,22(6):40-46.Chen Q G,Xu X F,Wang G C,et al. Influencing factors and parameters optimization of cold push-bending for aluminum alloy elbow[J]. Journal of Plasticity Engineering,2015,22(6):40-46.