董湘懷1, 楊國泰2, 何成宏2
(1.華中科技大學(xué) 塑性成型及模具技術(shù)國家重點實驗實,
武漢 430074；
2.南昌大學(xué) 機電學(xué)院， 南昌 330029)
摘 要: 通過引進一個反映金屬流速不均衡性的參數(shù)——流速均方差， 有效地控制型材擠壓成形時金屬流動的不均勻性。 采用有限變形彈塑性有限元方法， 對不同擠壓參數(shù)（擠壓比、 摩擦因子）下鋁型材擠壓過程進行了數(shù)值模擬研究， 獲得了擠壓壓力、 流速均方差和型材件內(nèi)部應(yīng)力應(yīng)變場隨擠壓參數(shù)變化的規(guī)律， 為鋁型材擠壓工藝參數(shù)優(yōu)化提供了理論參考。
關(guān)鍵字: 流速均方差；鋁型材擠壓；彈塑性有限元法； 工藝參數(shù)
DONG Xiang-huai1, YANG Guo-tai2, HE Cheng-hong2
（1. State Key Lab of Plastic Forming Simulation and Die & Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China；
2. Nanchang University, Nanchang 330029, China）
Abstract:The non-homogeneous metal flow during the extrusion forming process was well controlled by introducing a non-equilibrium parameter of metal flow, the mean-square deviation of velocity (SDV). The finite deformation elastoplastic finite element method was used to carry out the numerical simulation research on the profile extrusion process with different extrusion parameters (such as extrusion ratio, frictional factor). The change laws of the extrusion pressure, SDV and stress-strain fields with the extrusion parameters were obtained. It is theoretic consideration to optimize the technological parameters of the profile extrusion.
Key words: mean-square deviation of velocity; profile extrusion; elastoplastic finite element method; technological parameter
