锻压技术

带长直管的小弯曲半径薄壁弯头推弯成形实验研究

英文标题：Experiment research on pushbending of thinwalled and small bending radius elbow with long straight tube

作者：刘琪徐雪峰付春林王高潮华如雨

分类号：TG386

出版年,卷(期):页码：2018,43(5):0-0

摘要：

带长直管的小弯曲半径（R=1D）薄壁弯头推弯成形极易产生成形不足、失稳起皱等缺陷。通过改变摩擦系数和成形内压两种工艺参数，研究带长直管的小弯曲半径弯头推弯成形。结果表明：管材内部压力的大小对弯头成形效果影响显著，压力太小会造成管材弯曲段产生失稳起皱的现象，压力太大则易造成弯管成形不足和弯管头部破裂等缺陷；管坯外壁与模具型腔摩擦力的大小对弯头成形亦有重要影响，摩擦力过大将阻碍管坯材料沿轴向的流动，降低弯头长度。实验采用聚氨酯填料作弹性介质，二硫化钼作润滑剂，内胀推弯成形带长直管的小弯曲半径薄壁弯头，其外侧壁厚减薄量控制在安全范围之内。

Defects such as insufficient forming, instability and wrinkling seriously emerge in the pushbending for thinwalled and small bending radius (R=1D) elbow with long straight tube. The pushbending of thinwalled and small bending radius (R=1D)elbow with long straight tube was studied by changing friction coefficient and forming internal pressure. The results show that the internal pressure of tube has a significant influence on the forming of elbow, the instability wrinkling in the bending section of tube emerges because of too small pressure, and the defects such as insufficient forming and head fracture of elbow are prone to occur due to large pressure.Moreover, the friction between the outer wall of tube and the mold cavity also has an important influence on the forming of elbow, and the material flow of tube along the axial direction is hindered and the length of elbow is reduced due to excessive friction. In the experiment, polyurethane filler and supramoly were respectively used as elastic medium and lubricant, and the thinwalled and small bending radius elbow with long straight tube were formed by pushbending with internal bulging. And the thickness reduction of its outer wall is controlled within the scope of security.

基金项目：

国家自然科学基金资助项目（51405219）；中航工业产学研项目（BA2013063219）

作者简介：刘琪（1993-），男，硕士研究生 Email：lq2291923555@163.com 通讯作者：徐雪峰（1984-），男，博士，副教授 Email：xfwinzy@163.com

参考文献：

［1］陈钱, 雷君相. 芯模参数对高强度薄壁管数控弯曲成形质量的影响
［J］. 锻压技术, 2016, 41(11):158-163.

Chen Q, Lei J X. Influence of mandrel parameters on NC bending forming quality for high strength thinwall tube
［J］. Forging & Stamping Technology, 2016,41(11):158-163.

［2］Department of Engineering and Material Science, NSFC. Development Strategy Report of Mechanical Engineering Discipline (2011-2020) (in Chinese)
［M］. Beijing: Science Press, 2010.

［3］梁闯, 鲁世强, 方军,等. 间隙对TA18高强钛管数控弯曲成形截面畸变及壁厚变化的影响
［J］. 塑性工程学报, 2017,24(6):87-93.

Liang C, Lu S Q, Fang J,et al. Effect of boosting velocity on forming quality of highstrength TA18 titanium alloy tubes in numerical control bending
［J］. Journal of Plasticity Engineering,2017,24(6):87-93.

［4］郭训忠,陶杰,唐巧生,等. TA1-Al双金属复合管冷推弯模拟及试验
［J］. 中国有色金属学报, 2012,22(4): 1053-1062.

Guo X Z, Tao J, Tang Q S,et al. Cold pushbending simulation and experimental on TAl-Al bimetallic clad tube
［J］.The Chinese Journal of Nonferrous Metals, 2012,22（4）:1053-1062.

［5］陈先成,袁正,晏建军. 5083铝合金弯头冷推弯数值模拟及试验研究
［J］. 锻压技术,2011,36(1):57-60.

Chen X C，Yuan Z,Yan J J. Numerical simulation and experimental research on cold pushbending of Al 5083 elbow
［J］. Forging ＆ Stamping Technology,2011,36(1):57-60.

［6］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(22):128-133.

［7］郎利辉, 罗璇, 程鹏志,等. 薄壁小半径弯头弯胀成形数值模拟技术研究
［J］. 锻压技术, 2014, 39(12):45-52.

Lang L H, Luo X, Cheng P Z, et al. Numerical simulation research on bendbulge forming of thinwalled elbow with small bending radius
［J］. Forging & Stamping Technology, 2014,39(12):45-52.

［8］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 internalpressure bending process of small bend radius aluminum alloy tubular parts
［J］.Journal of Plasticity Engineering,2003,10(2):14－17.

［9］Zeng Y S, Li Z Q. Experimental research on the tube pushbending process
［J］.Journal of Materials Processing Techonlogy,2002,122(2):237-240.

［10］Li H, Yang H, Zhan M, et al. Deformation behaviors of thinwalled tube in rotary draw bending under push assistant loading conditions
［J］. Journal of Materials Processing Technology, 2010,210(1):143-158.

［11］苑世剑,何祝斌,刘钢,等.内高圧成形理论与技术的新进展
［J］.中国有色金属学报，2011,21(10)：2523-2533.

Yuan S J, He Z B, Liu G, et al. New developments in theory and processes of internal high pressure forming
［J］. The Chinese Journal of Nonferrous Metals, 2011,21(10)：2523-2533.

［12］刘劲松,张兴华,刘海,等. 薄壁钢管内胀推弯成形数值模拟及实验研究
［J］. 锻压技术,2012,37(2):63-67.

Liu J S, Zhang X H, Liu H, et al. Numerical simulation and experimental research on internal expansion push bending of thinwalled tube
［J］. Forging ＆ Stamping Technology,2012,37(2):63-67.

［13］郝静,张旭,吉卫喜,等. 芯棒对薄壁TA2钛管冷推弯曲成形影响的研究
［J］. 锻压技术,2015,40(11):40-47.

Hao J, Zhang X, Ji W X, et al. Research on influence of mandrels on the cold pushbending of thickwalled TA2 pipe
［J］.Forging ＆ Stamping Technology,2015,40(11):40-47.

［14］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. The influencing factors of cold pushbending forming research and parameters optimization on aluminium alloy elbow
［J］. Journal of Plasticity Engineering,2015,22(6): 40-46.

［15］陈国清, 王惠敏, 李鸿翔,等. 润滑条件对不锈钢管材推弯成形质量的影响
［J］. 锻压技术, 2016, 41(11):115-121.

Chen G Q, Wang H M, Li H X, et al. Influence of lubrication condition on forming quality of pushbending stainless steel tubes
［J］. Forging & Stamping Technology, 2016,41(11):115-121.

服务与反馈：

【文章下载】【加入收藏】