锻压技术

大径厚比不锈钢弯管内胀冷推弯成形数值模拟及实验研究

英文标题：Numerical simulation and experimental study on internal expansion cold push bending for stainless steel bent tube with large diameter to thickness ratio

作者：杨东徐雪峰范玉斌伍世天

单位：南昌航空大学

关键词：推弯成形弯管反推力管坯结构润滑方式

分类号：TG394

出版年,卷(期):页码：2022,47(10):154-161

摘要：

通过对规格为Φ70 mm×2 mm的不锈钢管进行内胀冷推弯成形数值模拟和实验研究，讨论了管坯结构、聚氨酯填块填充方式、反推力大小及润滑方式对弯曲角度为118.5°的大径厚比不锈钢弯管成形质量的影响。结果表明：管坯采用补偿端头结构可有效抑制弯曲内侧的材料堆积增厚，降低弯曲内侧的起皱风险；与冲头相接触的聚氨酯填块厚度为30 mm、其余聚氨酯填块厚度为15 mm时，填块的支撑效果更好且更有利于力的传递；反推力会影响内压及材料流动，反推力过小时，管坯内压不足，弯曲内侧不贴模且出现起皱现象，反推力过大时，摩擦力也相应增大，不利于内侧材料流动，会导致材料堆积引起管壁弯曲内侧起皱；弯管成形时摩擦力直接影响材料流动，采用分区域润滑的方式可改善管壁弯曲内侧的材料流动，有效减小管壁弯曲内侧的起皱风险，并有利于提高直端推出量。

Based on the numerical simulation and experimental study of internal expansion cold push bending for Φ70 mm×2 mm stainless steel tube, the influences of tube blank structure, filling method of polyurethane filling blocks, reverse thrust and lubrication method on the forming quality of stainless steel bent tube with large diameter to thickness ratio and the bending angle of 118.5° were discussed. The results show that the compensation end structure can effectively restrain the material accumulation and thickening, and reduce the risk of wrinkling in the bending inner side of tube blank. When the thickness of polyurethane filling block in contact with punch is 30 mm and the thickness of the rest of polyurethane filling blocks is 15 mm, the support effect of filling blocks is better and more conducive to force transmission. However, the reverse thrust affects the internal pressure and material flow. If the reverse thrust is too small, the internal pressure of tube blank is insufficient, and the bending inner side doe

基金项目：

国家自然科学基金资助项目（51975267）

杨东（1992-），男，硕士研究生，E-mail：erciayang1@163.com；通信作者：徐雪峰（1984-），男，博士，教授，E-mail：xfwinzy@163.com

参考文献：

[1]李鹏亮, 孙宾,张志,等. 薄壁小弯曲半径钛合金管材弯曲技术研究[J].航空制造技术，2013,56 (16):113-115.

Li P L，Sun B，Zhang Z，et al.Study on bend forming process for titanium alloy tube with thinwalled and small radius[J].Aeronautical Manufacturing Technology，2013，56 (16):113-115.

[2]徐勇，靳鹏飞，田亚强，等. 带波纹薄壁不锈钢管的弯曲成形工艺 [J]. 锻压技术，2020,45(6):71-79.

Xu Y，Jin P F，Tian Y Q，et al. Bending process of thinwalled stainless steel tube with corrugated section [J]. Forging & Stamping Technology，2020,45(6):71-79.

[3]詹梅, 杨合,江志强.管材弯曲成形的国内外研究现状及发展趋势[J].机械科学与技术,2004,23 (12):1509-1514.

Zhan M，Yang H，Jiang Z Q.State of the art of research on tube bending process [J]. Mechanical Science and Technology，2004，23 (12): 1509-1514.

[4]Wang Y，Han C，Yuan S J. Effect of internal pressure on corner radius and thickness distribution of shear hydrobending of 5A02 aluminum alloy tube[J]. Transactions of Nonferrous Metals Society of China，2012, (22):376-381.

[5]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.

[6]郭建军，杨立乐，戴钦，等. 薄壁弯管成形工艺分析及弯管模设计[J]. 模具工业,2021, 47 (3): 18-21.

Guo J J, Yang L L, Dai Q, et al.Analysis on forming process of thinwalled bend tube and the bending die design [J].Mould Industry,2021, 47 (3): 18-21.

[7]Song H, Xie W, Zhang S, et al. Granular media filler assisted push bending method of thinwalled tubes with small bending radius[J]. International Journal of Mechanical Sciences,2021, 198: 106365.

[8]Zhu Y X, Chen W, Li H P, et al. Springback study of RDB of rectangular H96 tube[J]. International Journal of Mechanical Sciences,2018, 138-139: 282-294.

[9]吴义旺，徐雪峰，陈波，等. 大径厚比不锈钢管小弯曲半径推弯成形缺陷影响因素研究[J].塑性工程学报,2019, 26 (6):76-83.

Wu Y W，Xu X F，Chen B，et al. Study on influencing factors of defects in pushbending forming of stainless steel tubes with large diameterthickness ratio and small bending radius[J]. Journal of Plasticity Engineering，2019，26 (6): 76-83.

[10]Guo Q，Ma F，Guo X，et al. Influence of mandrel on the forming quality of bending Lshaped hollow parts[J].International Journal of Advanced Manufacturing Technology，2018，95(10):4513-4522.

[11]陈清根, 徐雪峰, 马媛媛,等. 采用小弯曲半径弯头反向推直与正向推弯的管坯设计方法[J]. 中国机械工程, 2017, 28 (3):353-358.

Chen Q G，Xu X F，Ma Y Y，et al. Tube design method with small bend radius in elbow forming using reverse push straight and forward forming simulation [J]. China Mechanical Engineering，2017，28 (3): 353-358.

[12]Lucian Lazarescu. Effect of internal fluid pressure on quality of aluminum alloy tube in rotary draw bending[J]. The International Journal of Advanced Manufacturing Technology，2013, (64):85-91.

[13]徐雪峰，邱泽宇，华如雨，等. 内压与相对壁厚对薄壁管材弯曲成形的影响 [J].塑性工程学报，2018，25 (6):77-84.

Xu X F，Qiu Z Y，Hua R Y，et al. Influence of internal pressure and relative wallthickness on thinwalled tube bending forming [J]. Journal of Plasticity Engineering，2018，25 ( 6):77-84.

[14]Oh I Y，Han S W，Woo Y Y，et al. Tubular blank design to fabricate an elbow tube by a pushbending process[J].Journal of Materials Processing Technology，2018，260:112-122.

[15]Xu X, Fan Y, Wu Y, et al. A novel differential lubrication method for pushbending of Lshaped thinwalled tube with 1D bending radius[J]. International Journal of Material Forming, 2021, 14:691-701.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】