工艺参数对21-6-9高强不锈钢管数控弯曲壁厚减薄影响的显著性分析

摘要/Abstract

摘要：

为实现21-6-9高强不锈钢管数控弯曲精确成形，提高其成形质量与成形极限，需要对弯曲过程中壁厚减薄进行有效控制。基于ABAQUS/Explicit有限元软件平台，建立了21-6-9高强不锈钢管数控弯曲三维弹塑性有限元模型，并对其可靠性进行了验证。通过有限元模拟和正交试验，研究了工艺参数对21-6-9高强不锈钢管数控弯曲壁厚减薄影响的显著性及规律。结果表明，影响壁厚减薄的显著性工艺参数依次为芯棒伸出量、管材与芯棒间隙、管材与防皱块摩擦因数、管材与芯棒摩擦因数、管材与压块摩擦因数和弯曲速度，其影响规律为：壁厚减薄率随着芯棒伸出量、管材与防皱块摩擦因数、管材与芯棒摩擦因数、管材与压块摩擦因数、弯曲速度的增大或管材与芯棒间隙的减小而增大。采用多元线性回归方法建立了最大壁厚减薄率与显著性工艺参数之间的回归预测模型，经对比验证，回归预测模型结果与正交试验结果之间的相对误差不超过5%。

关键词: 21-6-9高强不锈钢管, 数控弯曲, 工艺参数, 壁厚减薄, 正交试验

Abstract:

To realize the precise NC bending and improve the forming quality and forming limit of 21-6-9 HSSST, which needed to control wall thinning effectively. A 3D elastic-plastic finite element model of NC bending process of the 21-6-9 HSSST was established based on the platform of ABAQUS/Explicit, and its reliability was validated. The influence significances and laws of process parameters on wall thinning of the 21-6-9 HSSST NC bending were studied by finite element simulation and orthogonal tests. The results show that the significant factors from high to low are the mandrel protrusion length, the clearance between tube and mandrel, the friction between tube and wiper die, the friction between tube and mandrel, the friction between tube and pressure die and the bending speed. Wall thinning becomes large with increasing of the mandrel protrusion length, the friction between tube and wiper die, the friction between tube and mandrel, the friction between tube and pressure die and the bending speed. While the wall thinning decreases with increasing of the clearance between tube and mandrel. Moreover, the prediction model between the maximum wall thinning degree and significant process parameters were established by multi-linear regression method. Compared with orthogonal test results, the relative error is less than 5%.

Key words: 21-6-9 high strength stainless steel tube(21-6-9 HSSST), NC bending;process parameter, wall thinning, orthogonal test

中图分类号:

TG386

方军, 鲁世强, 王克鲁, 姚正军. 工艺参数对21-6-9高强不锈钢管数控弯曲壁厚减薄影响的显著性分析[J]. 中国机械工程, 2015, 26(9): 1233-1238,1277.

Fang Jun, Lu Shiqiang, Wang Kelu, Yao Zhengjun. Significance Analysis of Effect of Process Parameters on Wall Thinning for 21-6-9 High Strength Stainless Steel Tube NC Bending[J]. China Mechanical Engineering, 2015, 26(9): 1233-1238,1277.

参考文献

[1]Yang H, Li H, Zhang Z Y, et al. Advances and Trends on Tube Bending Forming Technologies[J]. Chinese Journal of Aeronautics, 2012, 25(1):1-12.
[2]Yang H, Zhan M, Liu Y L, et al. Some Advanced Plastic Processing Technologies and Their Numerical Simulation[J]. Journal of Materials Processing Technology, 2004, 151(1/3):63-69.
[3]杨合，孙志超，林艳，等.管成形技术发展基础问题研究[J]. 塑性工程学报，2001,8（2）：83-85.
Yang He, Sun Zhichao, Lin Yan, et al. Advanced Plastic Processing Technology and Research Progress on Tube Forming[J]. Journal of plasticity Engineering, 2001, 8(2)：83-85.
[4]Pan K, Stelson K A. On the Plastic Deformation of a Tube during Bending[J]. Journal of Engineering for Industry, 1995, 117(4): 494-499.
[5]鄂大辛，宁汝新，古涛. 弯管横截面畸变的试验与分析[J]. 兵工学报，2006,27（4）：698-701.
E Daxin, Ning Ruxin, Gu Tao. Experiment and Analysis on the Distortion of Cross-section of Bent Tube[J]. Acta Armamentarii, 2006, 27(4):698-701.
[6]Li C, Yang H, Zhan M, et al. Effects of Process Parameters on Numerical Control Bending Process for Large Diameter Thin-walled Aluminum Alloy Tubes[J]. Transactions of Nonferrous Metals Society of China, 2009, 19(3):668-673.
[7]岳永保，杨合，詹梅，等. 薄壁管小弯曲半径数控弯曲壁厚减薄实验研究[J]. 锻压技术，2007,32（5）：58-62.
Yue Yongbao, Yang He, Zhan Mei, et al. Experimental Study on Thinning of Thin-walled Tube NC Bending Process with Small Bending Radius[J]. Forging and Stamping Technology,2007,32(5)：58-62.
[8]田玉丽，杨合，李恒，等. 6061-T4大直径薄壁管数控弯曲壁厚变化实验研究[J]. 材料科学与工艺，2012,20（2）：23-29.
Tian Yuli, Yang He, Li Heng, et al. Experimental Study on Wall thickness Variation in NC Bending of 6061-T4 Large Diameter Thin-walled Tubes[J]. Materials Science and Technology, 2012, 20(2):23-39.
[9]Gu R J, Yang H, Zhan M, et al. Effect of Mandrel on Cross Section Quality of Thin-walled Tube Numerical Controlled Bending[J]. Transactions of Nonferrous Metals Society of China, 2005, 15(6): 1264-1274.
[10]Yang H, Gu R J, Zhan M, et al. Effect of Frictions on Cross Section Quality of Thin-walled Tube NC Bending[J]. Transactions of Nonferrous Metals Society of China,2006, 16(4):878-886.
[11]Li H, Yang H. A Study on Multi-defect Constrained Bendability of Thin-walled Tube NC Bending under Different Clearance [J]. Chinese Journal of Aeronautics, 2011, 24(1):102-112.
[12]Yang H, Li H, Zhan M. Friction Role in Bending Behaviors of Thin-walled Tube in Rotary- draw- bending under Small Bending Radii[J]. Journal of Materials Processing Technology, 2010, 210(15): 2273- 2284.
[13]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.
[14]Li H, Yang H, Zhan M, et al. Role of Mandrel in NC Precision Bending Process of Thin-walled Tube[J]. International Journal of Machine Tools and Manufacture, 2007, 47(7/8): 1164-1175.
[15]Jiang Z Q, Zhan M, Yang H, et al. Deformation Behavior of Medium-strength TA18 High-pressure Tubes during NC Bending with Different Bending Radii[J]. Chinese Journal of Aeronautics, 2011, 24(5): 657-664.
[16]江志强，杨合，詹梅，等. 模具与管材不同配合条件下中强TA18厚壁钛管数控弯曲变形行为[J]. 塑性工程学报，2011,18(1): 21-27.
Jiang Zhiqiang, Yang He, Zhan Mei, et al. Deformation Behaviors of Medium-strength TA18 Thick-walled Tubes during NC Bending under Various Contact Conditions between Tube and Dies[J]. Journal of Plasticity Engineering, 2011,18(1):21-27.
[17]Zhan M, Jiang Z Q, Yang H, et al. Numerically Controlled Bending Performance of Medium Strength TA18 Titanium Alloy Tubes under Different Die Sets[J]. Science China Technological Sciences, 2011,54(4):841-852.
[18]Zhan M, Huang T, Jiang Z Q, et al. Determination of Process Parameters for the NC Bending of a TA18 Tube[J]. The International Journal of Advanced Manufacturing Technology, 2013,68(1/4):663-672.
[19]Fang J, Lu S Q, Wang K L, et al．Effect of Mandrel on Cross-Section Quality in Numerical Control Bending Process of Stainless Steel 2169 Small Diameter Tube[J]. Advances in Materials Science and Engineering, 2013,2013:1-9.
[20]李恒. 多模具约束下薄壁管数控弯曲成形过程失稳起皱行为研究[D]. 西安：西北工业大学, 2007.
[21]刘树勋，刘宪民，刘蕤，等. 0Cr21Ni6Mn9N奥氏体不锈钢的应变强化行为[J]. 钢铁研究学报，2005,17（4）：40-44.
Liu Shuxun, Liu Xianmin, Liu Rui, et al. Work-hardening Behavior of 0Cr21Ni6Mn9N Austenitic Stainless Steel[J]. Journal of Iron and Steel Research, 2005,17（4）：40-44.
[22]庄楚强，何春雄. 应用数理统计基础[M]. 3版.广州：华南理工大学出版社，2006.