工艺参数对挤压铜/铝复合板静水压力的影响
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摘要
利用Deform-3D软件对双坯料隔离挤压焊合铜/铝复合板成形过程进行了模拟,获得了工艺参数对变形通道内和焊合面上的静水压力的影响规律。结果表明:从变形体与挤压杆接触的端面至挤出板的区域沿挤压方向静水压力值越来越小;随着挤压速度的增大或坯料初始温度的降低,变形通道和焊合面上的静水压力值升高,且其随挤压速度变化呈近线性;但在800～850℃时,静水压力值变化不明显,而在低于800℃和高于850℃时,静水压力值分别陡升和陡降。
The forming process of separate extrusion of Cu/Al composite sheet with double billets was simulated. The influence of process parameters on the hydrostatic pressure in the deformed channel and the welding surface was obtained.The results show that along the extrusion direction from the end of the contact between the deformable body and the extruding rod to extruded plate zone, the hydrostatic pressure becomes smaller and smaller. With the increase of the extrusion speed or the decrease of the initial temperature of the blank, the hydrostatic pressure value on the deformation channel and welding surface increases, and it is nearly linearly changed with the extrusion speed changing. But in 800-850 ℃, the hydrostatic pressure value does not change obviously, but when the temperature is below 800 ℃ and over 850 ℃, the hydrostatic pressure value rises steeply and drops steeply, respectively.
The forming process of separate extrusion of Cu/Al composite sheet with double billets was simulated. The influence of process parameters on the hydrostatic pressure in the deformed channel and the welding surface was obtained.The results show that along the extrusion direction from the end of the contact between the deformable body and the extruding rod to extruded plate zone, the hydrostatic pressure becomes smaller and smaller. With the increase of the extrusion speed or the decrease of the initial temperature of the blank, the hydrostatic pressure value on the deformation channel and welding surface increases, and it is nearly linearly changed with the extrusion speed changing. But in 800-850 ℃, the hydrostatic pressure value does not change obviously, but when the temperature is below 800 ℃ and over 850 ℃, the hydrostatic pressure value rises steeply and drops steeply, respectively.
引文
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[2]左晓姣.铜铝复合板界面扩散层组织结构与性能的研究[D].沈阳:沈阳工业大学,2017.
[3] Zebardast M, Taheri A K.The cold welding of copper to aluminum using equal channel angular extrusion(ECAE)process[J].Journal of Materials Processing Technology,2011,211(6):1034-1043.
[4] Chitkara N R, Aleem A.Extrusion of axi-symmetric bi-metallic tubes from solid circular billets:application of a generalised upper bound analysis and some experiments[J].International Journal of Mechanical Sciences,2001,43(12):2833-2856.
[5]张将,朱琳,高翔宇,等.冷轧铜铝复合板结合界面残余应力分析[J].锻压技术,2016(2):30-34.
[6]宋继顺,马静云,张建民,等.铜铝双金属管材挤压成形工艺参数分析[J].重型机械,2012(3):47-50.
[7] Lapovok R, Ng H P, Tomus D, et al.Bimetallic copper-aluminium tube by severe plastic deformation[J]. Scripta Materialia,2012,66(12):1081-1084.
[8] Thilly L, Véron M, Ludwig O, et al.Deformation mechanism in high strength Cu/Nb nanocomposites[J].Materials Science&Engineering A,2001,309(2):510-513.
[9] Eivani A R, Taheri A K.A new method for producing bimetallicrods[J].MaterialsLetters,2007,61(19/20):4110-4113.
[10] Eizadjou M, Talachi A K, Manesh H D, et al.Investigation of structure and mechanical properties of multi-layered Al/Cu composite produced by accumulative roll bonding(ARB)process[J].Composites Science&Technology,2008,68(9):2003-2009.
[11] Carpenter J S, Mccabe R J, Zheng S J, et al.Processing parameter influence on texture and microstructural evolution in Cu-Nb multilayer composites fabricated via,accumulative roll bonding[J].Metallurgical&Materials Transactions A,2014,45(4):2192-2208.
[12]赵石岩,张有为,高杨,等.斜壁盒形件滚动拉深成形工艺的有限元分析[J].塑性工程学报,2017,24(5):38-43.