Mechanism of necking defect of 6082 aluminium alloy rolled by cross-wedge rolling method based on material thermal properties

Abstract

Necking defects have long troubled the application of cross-wedge rolling technology in aluminium alloy shaft parts. To accurately predict necking defects, new judgement conditions are established based on the thermal performance of 6082 aluminium alloy. The limit-sectional shrinkage without necking defects is achieved by combining theoretical calculation and finite-element model analysis, which couples heat transfer and deformation. In this paper, a 6082 aluminium alloy extruded rod with a 40 mm diameter rolled at a preheated temperature of 500 °C and a rolling angular velocity of 1 rad/s is taken as an example. The simulation and experimental results show that necking defects do not occur on the rolled pieces if the sectional shrinkage is below the limit-sectional shrinkage but will occur when the sectional shrinkage is above it. The results prove that the prediction model of necking defects in cross-wedge rolling of 6082 aluminum alloy is feasible, and this research provides a theoretical basis for the qualified aluminum alloy shafts produced by the cross-wedge rolling.

Keywords

6082 aluminium alloy / cross wedge rolling / limit-sectional shrinkage / necking mechanism / temperature field

References

[1] WangTao. Key manufacturing technology and application status of aluminum alloy automotive body parts [J]. Automobile Applied Technology, 2020, 7: 187-189

[2] ZhangP, SongA-l, FangY-x, YueX-j, WangY-q, YuXiao. A study on the dynamic mechanical behavior and microtexture of 6082 aluminum alloy under different direction [J]. Vacuum, 2020, 173: 109119

[3] RyouH, RombergE, PashleyD H, TayF R, ArolaD. Importance of age on the dynamic mechanical behavior of intertubular and peritubular dentin [J]. J Mech Behav Biomed Mater, 2015, 42229-242

[4] DengY-p, ZhaoN-n, ZhaoX-lian. Finite element simulation of cross wedge rolling aluminium alloy shaft parts [J]. Hot Working Technology, 2016, 45(3): 128-131

[5] BehrensB AThe International Academy for ProductionChattiS, LaperrièreL, ReinhartG, TolioT. Cross wedge rolling [M]. CIRP Encyclopedia of Production Engineering, 2018, Berlin, Heidelberg, Springer

[6] JiaZ, ZhouJ, JiJ-j, YuY-y, XiaoChuan. Influence of tool parameters on internal voids in cross wedge rolling of aluminum alloy parts [J]. Transactions of Nonferrous Metals Society of China, 2012, 22(S1): 21-26

[7] LiuY-a, LiuH-m, WuW, WuX-n, WangHu. Simulation research of die forging process of 6082 aluminum alloy control arm [J]. Journal of North China Institute of Aerospace Engineering, 2016, 26(4): 11-13

[8] CaiY-n, ZhangK-s, LouY-z, HuZhenghuan. Effect of forming angle on central defect of twice cross wedge rolling [J]. Forging & Stamping Technology, 2008, 33(3): 68-71

[9] ZhouJ, YuY-y, ZengQiang. Analysis and experimental studies of internal voids in multi-wedge cross wedge rolling stepped shaft [J]. International Journal of Advanced Manufacturing Technology, 2014, 72: 1559-1566

[10] KacheH, NickelR, BehrensB A. An innovative cross wedge rolling preforming operation for warm forging [M]. Enabling Manufacturing Competitiveness and Economic Sustainability, 2011, Berlin, Heidelberg, Springer Berlin Heidelberg, 310315

[11] PaterZ, GontarzA, WeronskiW. Cross-wedge rolling by means of one flat wedge and two shaped rolls [J]. Journal of Materials Processing Technology, 2006, 177(1–3): 550-554

[12] JiaZ, ZhangK-s, YangC-p, HuZ-huan. Forming principle of heavy section shrinkage cross wedge rolling by single wedge [J]. Journal of University of Science and Technology Beijing, 2009, 31(8): 1046-1050

[13] JiaZ, ZhangK-s, TangX-g, HuZ-huan. Analysis on principle of spread width’s effect on cross wedge rolling limit-section shrinkage [J]. Transactions of Beijing Institute of Technology, 2010, 30(6): 655-659

[14] PaterZ, WeroñskiW, KazaneckiJ, GontarzA. Study of the process stability of cross wedge rolling [J]. Journal of Materials Processing Technology, 1999, 92–93: 458-462

[15] JiaZ, ZhouJ, JiJ-j, LeiZ-z, XiangD, SunX-tian. Influence analysis of area reduction for necking in twice-stage cross wedge rolling [J]. Int J Adv Manuf Technol, 2013, 66: 1407-1413

[16] XuH, WangB-y, ZhouJ, JiH-c, MuY-h, LiJ-ling. Comparative study of warm and hot cross-wedge rolling: Numerical simulation and experimental trial [J]. International Journal of Advanced Manufacturing Technology, 2017, 92(9–12): 3541-3551

[17] LiJ-qiangHot forge ability parameter identification and grain refinement study of wrought magnesium alloys [D], 2015, Shanghai, Shanghai Jiao Tong University

[18] ShuX-d, LiuD-y, ShenG-xian. Analyzing rolling pressure of rolling strip by multi-object contact multi-pole boundary element method [J]. Advanced Materials Research, 2012, 428: 14-18

[19] SunX-h, YangM, KongD-m, HeJ-y, LiX-ming. Research on mechanical property of 6082-T6 aluminum alloy at low and elevated temperature [J]. Electric Welding Machine, 2019, 49(2): 51-54

[20] ShiH, MclarenA J, SellarsC M. Constitutive equations for high temperature flow stress of aluminum alloys [J]. Materials Science & Technology, 1997, 13(3): 210-216

[21] ZhaoD W, TieW L. A precise method of calculating the parameter: The mean strain rate in rolling [J]. Journal of Applied Sciences, 1995, 13(1): 103-108

[22] GaoF-s, XiA-m, LiuH-f, WangChao. Analysis of temperature field of hot rolled work roller of aluminum sheet [J]. Journal of Northeastern University (Natural Science), 2015, 36(10): 1496-1500

[23] AnM-m, YangH-h, WuY-h, ZhangW-f, DingZ-fang. Theoretical and experimental study on the characteristics of air plate-fin radiator [J]. Building Energy & Environment, 2018, 37(1): 27-31

[24] WeiWResearch on hot deformation behavior and microstructure property of 6082 aluminum alloy forging with rib [D], 2013, Beijing, Beijing Institute of Mechatronics

[25] ShuX D, SunB S, PengW FCross wedge rolling theory and forming technology [M], 2014, Beijing, Science Press

[26] SilvaM L N, PiresG H, ButtonS T. Damage evolution during cross wedge rolling of steel DIN 38MnSiVS5 [J]. Procedia Engineering, 2011, 10: 752-757