(1. 湖南大學(xué) 汽車車身先進設(shè)計制造國家重點實驗室，長沙 410082；
2. 湖南大學(xué) 機械與運載工程學(xué)院，長沙 410082)
摘 要: 在鋁合金熱擠壓過程中，工件與模具界面的摩擦對模具磨損、擠壓載荷、產(chǎn)品表面質(zhì)量等具有重要的影響。摩擦也是擠壓數(shù)值仿真中一個重要的邊界條件，影響因素多，難以定量確定。為得到精確的仿真結(jié)果，需采用合理的摩擦模型。揭示鋁合金熱擠壓過程中不同接觸界面的摩擦學(xué)行為。分析工作帶位置的摩擦磨損對型材表面質(zhì)量的影響機理。綜述模具材料的表面強化技術(shù)，并對各工藝作出評價。歸納總結(jié)鋁合金熱擠壓過程中采用的摩擦理論模型及等效表征方法。最后指出熱擠壓過程中界面摩擦研究存在的主要問題。
關(guān)鍵字: 鋁合金；熱擠壓；界面摩擦；摩擦學(xué)行為；摩擦模型；表征方法
（1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;
2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China）
Abstract:In the hot extrusion of aluminium alloys, friction at the workpiece/tools interface has great influence on the die wear, profile surface quality and extrusion load. The friction coefficient is also an important thermal boundary condition in the FE simulation of aluminium extrusion, which is affected by many factors and hard to be quantified. To obtain accurate simulation results, reasonable friction models and friction coefficient should be adopted. The tribological behaviors of contact interfaces in the hot extrusion of aluminum alloy were revealed. The effect of friction and wear on the surface quality of the profile in the bearing was analyzed. The research status and development of surface treatment techniques were comprehensively reviewed and evaluated. The friction models and equivalent characterizations being used for the FE simulation of aluminium extrusion at different contact interfaces were summarized. The main problems of friction in the hot extrusion of aluminium alloys were put forward.
Key words: aluminium alloy; hot extrusion; interface friction; tribological behavior; friction model; equivalent characterization
