Ti-6Al-4V合金J-C本构参数对高速切削过程切削力的灵敏度分析  

Sensitivity Analysis of J-C Constitutive Parameters to Cutting Force in Ti-6Al-4V Titanium Alloy High Speed Cutting Process

作　　者：邱彩云 冯吉路 QIU Cai-yun;FENG Ji-lu(Jiangsu College of Safety Technology,Xuzhou Jiangsu 221000,China;School of Control and Mechanical Engineering,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]江苏安全技术职业学院,江苏徐州221000 [2]天津城建大学控制与机械工程学院,天津300384

出　　处：《组合机床与自动化加工技术》2021年第3期149-152,158,共5页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家自然科学基金(51905356);天津市教委科研计划项目(2018KJ173)。

摘　　要：为了研究高速切削时Johnson-Cook(J-C)本构模型参数对切削力的影响,采用Box-Behnken中心组合试验设计和Kriging拟合法与有限元法相结合的方式,以材料本构模型参数A、B、n、C、m为自变量,平均切削力为响应值,建立了本构模型参数与平均切削力的响应面函数,并应用Monte Carlo随机抽样法和灵敏度分析法结合的方式,从统计学角度定量分析了材料本构参数对切削力的影响。研究表明:在钛合金Ti-6Al-4V高速切削时,其材料初始屈服强度A、应变硬化系数B和热软化指数m对平均切削力的影响较大,应变率硬化系数C对切削力几乎没有影响。该研究为深入理解高速切削加工机理和切削力的准确预测提供了理论依据。To investigate the effect of Johnson-Cook(J-C)constitutive model parameters on cutting force during high speed cutting,the response surface function between the parameters of the J-C constitutive model and the average cutting force,in which the A,B,n,C,m parameters of the J-C constitutive model are independent variables and the cutting force is a response value,was established with the aid of Box-Behnken center combination test design,Kriging fitting and finite element analysis.The influence of material constitutive parameters on cutting force is analyzed quantitatively from the statistical point of view by using the combination of Monte Carlo random sampling method and sensitivity analysis method.The results show that the initial yield strength A,strain hardening coefficient B and thermal softening index m hardening exponent n have a great influence on the average cutting force,and that the strain rate hardening coefficient C has little effect on the average cutting force.This study provides a theoretical basis for understanding the mechanism of high-speed cutting and predicting accurately cutting force.

关 键 词：TI-6AL-4V合金 J-C本构模型 切削力 灵敏度分析 

分 类 号：TH162[机械工程—机械制造及自动化] TG65[金属学及工艺—金属切削加工及机床]