航空铝合金高速铣削加工的三维数值模拟  

Three-dimensional numerical simulation for high speed milling of aerospace aluminum alloy

作　　者：吴红兵[1] 柯映林[1] 刘刚[1] 成群林[1] 毕运波[1] 

机构地区：[1]浙江大学机械与能源工程学院,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2008年第2期234-238,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金重点资助项目(50435020);国家"863"高技术研究发展计划资助项目(2006AA04Z147)

摘　　要：针对当前高速切削加工中模拟直角和斜角的有限元模型将变厚度切削层、螺旋形刀刃分别简化为等厚度切削层和直线形刀刃的不足,采用更接近实际的三维螺旋齿铣刀模型和变厚度切削层模型,对航空铝合金7050-T7451进行了高速铣削加工数值模拟,得到了铣削过程的切削力、切削温度及切屑形状.通过高速铣削实验测得了切削力,在相同的切削条件下模拟结果与实验结果比较吻合,切削温度及切屑形状也与实际相符.研究表明,三维螺旋齿铣刀模型和变厚度切削层模型可以准确模拟高速铣削加工过程,能够进一步用于研究切削参数与切削力、切削热之间的关系,进行切削参数及刀具寿命优化.Due to the shortcomings of orthogonal and oblique cutting numerical simulation in which the tool edge was straight and the thickness of cutting layer was equal, a three-dimensional finite element tool model with helix primary cutting edge and a variable thickness cutting layer model were presented. The high speed milling process of aerospace aluminum alloy 7050-T7451 was simulated based on the presented tool model and the cutting layer model, and the cutting force and the cutting temperature were obtained. A milling force experiment was carried out under the same cutting conditions as the simulation, and a good agreement between the simulation result and the experimental result was achieved. Moreover, the temperature and chip shape matched the practice well. The simulation shows that the three-dimensional finite element tool model and the cutting layer model can be used to correctly simulate the milling process and be adopted to study the relationship between the cutting force and the temperature, and optimize the cutting parameters and the tool life.

关 键 词：铝合金 数值模拟 切削力 切削层 切削温度 

分 类 号：TH16[机械工程—机械制造及自动化]