|
In order to manufacture a uniform ultrafine-grain age-hardening aluminum alloy without damage, and to overcome the severe plastic deformation of traditional extrusion process with equal diameter angle, which brought to time-consuming problems such as multiple loading and charging, mechanical processing of bar, a new parallel extrusion process of rotated channel and equal diameter angle was proposed. Then, multiple shear deformation areas were set up in the channel, and the shear deformation direction and angle of samples were changed by setting rotating channel between extrusion channels with two equal diameter angles. Therefore, the Bc process path was conducted, and the deformation uniformity was improved. According to the orthogonal experiment method, the interior angle Φ, the outer corner Ψ, the lead angle γ, the oval factor m and the length of L1 were chosen as facts, and extrusion simulations were realized by the finite element method under 16 simulation experiments of different die parameters. Furthermore, the equivalent strain,equivalent stress, damage and deformation uniformity coefficient were analyzed as the indexes of orthogonal experiment method, and the influences of them on extrusion process were conducted. The simulation results show that the reasonable values are angle Φ of 90°-120°,the outside corners Ψ of 30°-40°, the lead angle γ of 60°-80° and m of 1.2-1.4,L1 and L3 of d-1.5d in good extrusion channel respectively.
|
|
［1］史庆南, 王效琪,起华荣，等.大塑性变形(Severe Plastic Deformation，SPD)的研究现状[J]. 昆明理工大学学报：自然科学版,2012，37（2）：23-38.Shi Q N, Wang X Q, Qi H R, et al. Research status of severe plastic deformation[J]. Journal of Kunming University of Science and Technology：Natural Science Edition, 2012,37(2):23-38.
［2］高松松, 王进.等通道角挤压对高纯铝力学性能的影响[J]. 锻压技术，2015，40（8）：132-134.Gao S S，Wang J. Influence of equal channel angular extrusion on mechanical property of high purity aluminum [J]. Forging & Stamping Technology, 2015,40（8）:132-134.
［3］刘晓燕，赵西成，杨西荣，等. ECAP变形制备超细晶金属材料变形行为的研究进展[J].材料导报，2011,25（5）：11-15.Liu X Y, Zhao X C, Yang X R, et al. Progress in research on deformation behavior of ultrafine-grained metallic materials processed by ECAP[J].Materials Review, 2011,25（5）:11-15.
［4］范爱琴,周乐育,邓陈虹,等.等通道转角挤压超细晶材料技术及其发展[J].钢铁研究学报,2012,24（7）:1-4.Fan A Q, Zhou L Y, Deng C H, et al. Research and development of ultra-fine grain technology with equal channel angular extrusion processing[J]. Journal of Iron and Steel Research,2012,24（7）:1-4.
［5］Wang X X, He M, Zhu Z, et al. Influence of twist extrusion process on consolidation of pure aluminum powder in tubes by equal channel angular pressing and torsion[J].Trans. Nonferrous Met. Soc. China, 2015,25:2122-2129.
［6］王克平,赵西成. ECAP模具结构改进与设计[J].热加工工艺,2009,38（1）:144-149.Wang K P, Zhao X C. Design and improvement of die for ECAP[J]. Hot Working Technology, 2009,38(1):144-149.
［7］张渝，丁波，马军伟.基于正交试验的热冲压冷却过程数值模拟分析[J]. 锻压技术，2015，40（3）：105-109.Zhang Y, Ding B, Ma J W. Numerical simulation of hot stamping cooling process based on orthogonal experiment [J]. Forging & Stamping Technology,2015,40（3）:105-109.
［8］杨志高，徐永礼，庞祖高，等.基于Deform-3D方管铝合金型材等温挤压的变速挤压数值模拟[J]. 锻压技术，2015，40（4）：152-157.Yang Z G, Xu Y L, Pang Z G, et al. Numerical simulation of variable speed extrusion for isothermal extrusion process of aluminum alloy square tube based on Deform-3D [J]. Forging & Stamping Technology, 2015, 40（4）:152-157.
［9］谢延敏，田银，孙新强，等.基于灰色关联的铝合金板拉深成形扭曲回弹工艺参数优化[J]. 锻压技术，2015，40（3）：25-31.Xie Y M，Tian Y，Sun X Q，et al. Optimization on parameters of twist springback process for aluminum alloy sheet deep drawing based on grey correlation [J]. Forging & Stamping Technology，2015，40（3）：25-31.
［10］丁雨田，唐向前，袁训锋，等. ECAP条件下纯铜应变行为的等效应变规律及变形均匀性[J].兰州理工大学学报，2009,35（5）：1-4.Ding Y T, Tang X Q, Yuan X F, et al. The equivalent strain pattern and deformation uniformity of strain behavior of pure copper in case of ECAP[J]. Journal of Lanzhou University of Technology，2009,35（5）：1-4.
|
Copyright Forging & Stamping Technology.All rights reserved