(1. 湖南大学 汽车车身先进设计制造国家重点实验室，长沙 410082；
2. 湖南大学 机械与运载工程学院，长沙 410082)
摘 要: 在铝合金热挤压过程中，工件与模具界面的摩擦对模具磨损、挤压载荷、产品表面质量等具有重要的影响。摩擦也是挤压数值仿真中一个重要的边界条件，影响因素多，难以定量确定。为得到精确的仿真结果，需采用合理的摩擦模型。揭示铝合金热挤压过程中不同接触界面的摩擦学行为。分析工作带位置的摩擦磨损对型材表面质量的影响机理。综述模具材料的表面强化技术，并对各工艺作出评价。归纳总结铝合金热挤压过程中采用的摩擦理论模型及等效表征方法。最后指出热挤压过程中界面摩擦研究存在的主要问题。
关键字: 铝合金；热挤压；界面摩擦；摩擦学行为；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
