摘要
基于对传统的剪切角模型的分析,借助快速落刀试验及直角切削力试验,获得了航空铝合金7050-T7451在切削加工中的剪切角以及前刀面的平均摩擦因数。应用高温霍普金森压杆(SHPB)动态压缩试验,构建铝合金7050-T7451的应力、应变及温度的本构方程,为有限元Deform模拟提供合理的材料模型以准确模拟切削加工过程。对模拟加工过程、传统Merchant剪切角模型以及快速落刀试验分别得到的剪切角进行了比较,基于结果误差对传统剪切角模型进行修正,建立了更适用于高速切削加工航空铝合金7050-T7451的剪切角模型。
The shear angle was measured by means of spring ＂Quick-Stop＂ device at various cutting speeds. Then the orthogonal cutting force tests were conducted to obtain the tangential force and normal force in order to investigate the average friction coefficient on the rake face in machining aluminum alloy 7050-T7451. With high temperature Split-Hopkinson pressure bar （SHPB） compression tests, the constitutive equation for 7050 T7451 was established and provided material model for Deform-3D software in order to improve the simulation precision. Experimental, simulation and calculated results have been compared with classic formula （Merchant＇s Equation）, it is shown that the calculated results are significantly different from others. At last the new shear angle model was modified and established, as well as the experimental results and simulation for its validation. The new shear angle model is proved to be more suitable for expressing the variety of shear angle in high speed cutting process of aluminum alloy 7050-T7451.
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2007年第2期220-224,共5页
China Mechanical Engineering
基金
国家自然科学基金资助重点项目(50435020)
