不同模具组合对0Cr21Ni6Mn9N不锈钢管数控弯曲成形质量的影响

摘要/Abstract

摘要： 采用有限元法研究了不同模具组合下0Cr21Ni6Mn9N不锈钢管数控弯曲应力应变分布、壁厚变化和截面畸变规律。研究结果表明：在弯曲模、夹块和压块组成的基本模块的基础上，添加防皱块会导致等效应力、切向拉应力和切向拉应变增加，而切向压应力、等效应变和切向压应变减小；添加芯棒会导致切向应力和等效应变减小，而等效应力和切向应变增大；同时添加防皱块和芯棒则会导致等效应力、切向应力和切向应变增大，而等效应变减小。添加防皱块会导致弯管截面畸变率增大，但对壁厚变化率影响不大；添加芯棒能够有效抑制弯管截面畸变，且壁厚减薄率仅为9.0%~9.15%，远小于15%的航空标准。综合考虑0Cr21Ni6Mn9N不锈钢管数控弯曲成形质量和生产成本，可确定出最优的模具组合为弯曲模+压块+夹块+芯棒。

关键词: 0Cr21Ni6Mn9N不锈钢管, 数控弯曲, 模具组合, 应力/应变, 成形质量

Abstract: The laws of stress/strain distribution, wall thickness variation and cross section deformation of 0Cr21Ni6Mn9N stainless steel tube during NC bending under different die sets were studied by using the finite element method. The results show that adding a wiper die to the base die set including bending die, clamp die and pressure die increases the effective stress, tangential tensile stress and tangential tensile strain, but decreases tangential compressive stress, effective strain and tangential compressive strain; adding a mandrel to the base die set decreases the tangential stress and effective strain, but increases effective stress and tangential strain; adding the wiper die and mandrel simultaneously to the base die set increases effective stress, tangential stress and tangential strain, while decreases the effective strain. Adding the wiper die increases the cross section deformation ratio, but has no obvious effects on wall thickness variation ratio; adding the mandrel can restrain cross section deformation effectively, and the wall thinning ratio is far less than 15% of the aviation standard, which is only 9.0%~9.15%. Considering the forming quality and cost of 0Cr21Ni6Mn9N stainless steel tube during NC bending, the optimal die sets are bending die, pressure die, clamp die and mandrel.

Key words: 0Cr21Ni6Mn9N stainless steel tube, NC bending, die set, stress/strain, forming quality

中图分类号:

TG386.4

鲁世强, 方军, 唐金星, 王克鲁. 不同模具组合对0Cr21Ni6Mn9N不锈钢管数控弯曲成形质量的影响[J]. 中国机械工程.

Lu Shiqiang, Fang Jun, Tang Jinxing, Wang Kelu. Effects of Different Die Sets on Forming Quality of 0Cr21Ni6Mn9NStainless Steel Tube during NC Bending[J]. China Mechanical Engineering.

参考文献

[1]Yan J, Yang H, Zhan M, et al. Forming Limits under Multi-index Constraints in NC Bending of Aluminum Alloy Thin-walled Tubes with Large Diameters [J]. Science China Technological Sciences, 2010, 53(2): 326-342.

[2]王振华, 田野，张龙.不锈钢管力学性能的拉伸试验[J].塑性工程学报,2012,19(2):56-59.

Wang Zhenhua, Tian Ye, Zhang Long. Tensile Test and Study on the Mechanical Properties of Stainless Steel Tubes[J]. Journal of Plasticity Engineering, 2012,19(2):56-59.

[3]Li H, Yang H. A Study on Multi-defect Constrained Bendability of Thin-walled Tube NC Bending under Diffrent Clearance[J]. Chinese Journal of Aeronautics, 2011,24(1):102-112.

[4]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):1164-1175.

[5]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.

[6]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(4):663-672.

[7]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.

[8]Szen L, Guler M A, Bekar D, et al. Investigation and Prediction of Springback in Rotary-draw Tube Bending Process Using Finite Element Method [J]. Mechanical Engineering Science, 2012, 226(12): 2967-2981.

[9]张静静,杨合,詹梅,等.助推作用对大口径铝合金薄壁管数控弯曲壁厚减薄和回弹的影响[J].塑性工程学报,2008, 15(1):60-65.

Zhang Jingjing, Yang He, Zhan Mei, et al.Effects of Pressing Dies Boosting Function on Wall Thinning and Springback in NC Bending Process of Thin-walled Tube with Large Diameter[J]. Journal of Plasticity Engineering, 2008, 15(1):60-65.

[10]Fang Jun, Lu Shiqiang, Wang Kelu, et al. Three-dimensional Finite Element Model of High Strength 21-6-9 Stainless Steel Tube in Rotary Draw Bending and Its Application [J]. Indian Journal of Engineering and Materials Sciences, 2015, 22(2): 141-152.

[11]方军,鲁世强,王克鲁,等.21-6-9高强不锈钢管数控弯曲回弹对材料参数的敏感性[J].西安交通大学学报，2015,49（3）：136-142.

Fang Jun, Lu Shiqiang, Wang Kelu, et al. Sensitivity Analysis of Springback to Material Paramenters in High Strength 21-6-9 Stainless Steel Tube NC Bending[J]. Journal of Xi'an Jiaotong Unviersity, 2015,49(3):136-142.

[12]Fang Jun, Lu Shiqiang, Wang Kelu, et al. Deformation Behaviors of 21-6-9 Stainless Steel Tube Numerical Control Bending under Different Friction Conditions [J]. Journal of Central South University.2015, 22(8):2864-2874.

[13]方军, 鲁世强, 王克鲁,等.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, et al. 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.