锻压技术

大截面变化率汽车排气管的多工步液力成形工艺

英文标题：Multi-step hydro-mechanical forming process for automobile exhaust pipe with large changing rate of cross section

分类号：U27

出版年,卷(期):页码：2021,46(10):141-149

摘要：

为解决某乘用车大截面变化率排气管的整体制造难题，以439铁素体不锈钢管作为研究对象，基于eta/DYNAFORM建立了包含合模、补料、成形、整形在内的液力成形过程的有限元模型。并与实验相结合，研究了关键工艺参数对成形质量的影响规律，设计并优化了液力成形加载路径。结果表明，加载路径对排气管的壁厚分布和减薄率有显著影响。第1道次下，经响应面法优化后得到了成形压力、整形压力、轴向补料位移所组成的加载路径，所得到的零件最大减薄率为15.3%。第2道次下，优化后的最大减薄率为5.0%。第3道次下，优化后的最大减薄率为5.2%，以上3道次优化前的累计最大减薄率为31.5%，优化后的累计最大减薄率为23.7%，降低幅度为24.7%。最终通过实验验证证实优化后的液力成形工艺显著降低了零件成形开裂风险，并获得了质量优异的大截面变化率整体汽车排气管零件。

In order to solve the overall manufacturing problem of exhaust pipe with large changing rate of cross section for a passenger car, the finite element model of the hydro-mechanical forming process including die closing, feeding, forming and shaping for 439 ferritic stainless steel tube was established based on eta/DYNAFORM. Combined with experiments, the influence laws of key process parameters on forming quality were studied, and the loading path of hydro-mechanical forming were designed and optimized. The results show that the loading path has a significant effect on the wall thickness distribution and thinning rate of exhaust pipe. In the first pass, the loading path including forming pressure, shaping pressure and axial feeding displacement is obtained by the response surface method, and the maximum thinning rate of the obtained parts is 5.2%. In the second pass, the maximum thinning rate is 5.0% after optimization. In the third pass, the maximum thinning rate is 5.2% after optimization. The cumulative maximum thinning rates before and after optimization are 31.5% and 23.7%, the reduction region is 24.7%. Then the experimental verification proves that the optimized hydro-mechanical forming process significantly reduces the risk of crack for part, and the excellent overall automobile exhaust pipe parts with large changing rate of cross section are obtained.

基金项目：

国家自然科学基金资助项目（51875548）；中国科学院青年创新促进会专项（2019195）；沈阳市重大科技成果转化专项（20-203-5-30）

作者简介：岳峰丽（1970-）,女，硕士，副教授 E-mail：flyue@163.com 通信作者：徐勇（1983-），男，博士，研究员 E-mail：yxu@imr.ac.cn

参考文献：

[1]张士宏, 徐勇,程明,等.脉动液压成形技术与设备[J].机械工程学报,2013,49(24):1-6.

Zhang S H, Xu Y, Cheng M, et al. Technology and equipment of the pulsating hydroforming technology[J]. Journal of Mechanical Engineering, 2013, 49(24): 1-6.

[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, Xia L L, et al. Bending process of thin-walled stainless steel tube with corrugated section [J]. Forging & Stamping Technology, 2020, 45(6): 71-79.

[3]何鹏申, 陈玉杰,郜昊强,等. 管材液压成形在汽车节能减排中的开发应用[J].锻压装备与制造技术,2019,54(1):84-88.

He P S, Chen Y J, Gao H Q, et al. Development and application of pipe hydroforming in energy saving and emission reduction of automobile [J].Forging Equipment and Manufacturing Technology, 2019,54(1): 84-88.

[4]曾一畔, 徐勇, 夏亮亮, 等. 加载路径对铝合金航空复杂薄壁构件主动式充液成形性能的影响[J]. 塑性工程学报,2019,26(5):180-189.

Zeng Y P, Xu Y, Xia L L, et al. Influence of loading paths on formability of aviation complex thin-walled component of aluminum alloy in hydroforming [J]. Journal of Plasticity Engineering, 2019,26(5): 180-189.

[5]许桦. 内高压成形管件在汽车上的应用[J]. 上海汽车, 2012, （7）: 52-55.

Xu H. Application of internal high pressure formed pipes in automobiles[J]. Shanghai Auto, 2012, （7）: 52-55.

[6]郑再象. 汽车用异型截面管件液压成形设备及工艺参数研究[D]. 南京：南京理工大学,2007.

Zheng Z X. Investigation of Hydroforming Equipment Machining Profiled Crosess-section Tube Used in Automobile and Process Parameters [D]. Nanjing:Nanjing University of Science and Technology, 2007.

[7]Kocanda A, Sadlouska H. Automotive component development by means of hydroforming[J].Archives of Civil and Mechanical Engineering, 2008,8(3):55-72.

[8]李明, 徐勇,张士宏,等. 弯曲预成形和液压成形对汽车装饰尾管壁厚分布的影响[J].锻压技术, 2020, 45(3): 41-46.

Li M, Xu Y, Zhang S H, et al. Effect of pre-bending and hydroforming on thickness distribution for automobile decorative tail pipe[J]. Forging & Stamping Technology, 2020, 45(3): 41-46.

[9]樊黎霞, 王世哲,杨晨,等.管件高压液力成形技术的发展综述[J].机械制造与自动化, 2013, 42(6): 1-6.

Fan L X, Wang S Z, Yang C, et al. Development of tube high pressure forming technique [J]. Machinery Manufacturing and Automation, 2013, 42(6): 1-6.

[10]刘劲松, 聂凤明,康战,等.液力成形技术在薄壁管件加工中的应用研究[J]. 现代制造工程, 2010, (7): 84-89.

Liu J S, Nie F M, Kang Z, et al. Research on application of the hydraulic confectioning technique to machining thin-wall pipe fitting [J].Modern Manufacturing Engineering, 2010, (7): 84-89.

[11]Xu Y, Ma Y, Zhang S H, et al. Numerical and experimental study on large deformation of thin-walled tube through hydroforging process[J]. International Journal of Advanced Manufacturing Technology, 2016, 87(5): 1-6.

[12]Xia L, Xu Y, El-Aty A A, et al. Deformation characteristics in hydro-mechanical forming process of thin-walled hollow component with large deformation: Experimentation and finite element modeling[J]. Int. J. Adv. Manuf. Technol.,2019, 104: 4705-4714.

[13]Yuan S J, Han C, Wang X S. Hydroforming of automotive structural components with rectangular-sections[J]. International Journal of Machine Tools and Manufacture, 2006, 46(11):1201-1206.

[14]Zhang S H, Danckert J. Development of hydromechanical deep drawing[J]. Journal of Material Process Technology, 1998, (83):14-25.

[15]Zhang S H. Developments in hydroforming[J]. Journal of Materials Processing Technology, 1999, (91):236-244.

[16]徐鸣涛, 王丽娟,陈宗渝,等. 基于管件液压成形工艺的汽车吸能盒改进设计及成形分析[J]. 机械强度, 2016, 38(6): 115-120.

Xu M T, Wang L J, Chen Z Y, et al. Automoblie crash box improvement and forming analysis for tube hydroforming [J]. Mechanical Strength, 2016, 38(6): 115-120.

[17]靳舜尧，唐振宇，黄重国.5A02铝合金薄壁异形管内高压成形数值模拟及试验[J].稀有金属, 2020, 44(11): 1121-1128.

Jin S Y, Tang Z Y, Huang Z G. Numerical simulation and experiment of internal high pressure forming（IHPF）of 5A02 aluminum alloy thin-walled shaped tubes[J]. Chinese Journal of Rare Metals, 2020, 44(11): 1121-1128.

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