摘要
利用SHPB实验研究得到了Ti6Al4V在高应变率条件下的应力-应变关系,拟合出了一种Ti6Al4V的J-C本构方程的新的参数模型。在此基础上,基于ABAQUS软件的Explicit分析,建立了Ti6Al4V高速铣削的二维简化模型并进行了仿真研究。仿真结果表明:热塑性失稳和塑性侧滑是引起锯齿形切屑的主要原因;锯齿化程度Gs随着铣削速度的增加而降低,随着进给速度的增加而增加,揭示了锯齿形切屑的形成过程并对高速铣削Ti6Al4V的加工参数选择提供了参考。进行了实际的高速铣削实验,实验表明:仿真所得切屑形状与实验所得切屑形状吻合度较高。
By SHPB （ Split Hopkinson Pressure Bar） test study conducted, the relation of stress-stress change of Ti6Al4V under condition of high stress change rate was obtained to fit out a new J-C constitutive equation parameters model of Ti6Al4V. Based on this, a simplified two-dimensional （2-D） model for high-speed milling Ti6Al4V based on ABAQUS/Explicit software analysis was estab-lished, and studied with simulation. The simulation results show that thermoplastic instability and plastic side flow is the main cause for saw tooth chip. The chip saw-tooth degree Gs decreases when increasing rotating speed, while it increases when increasing feed speed. Useful understanding of the forming process of saw-tooth chip is made, which provides reference for selection of machining parameters of high-speed milling Ti6Al4V. Actual high-speed milling experiments were carried out. Experiments show that chip shape of the simu-lation and experimental results agree well.
出处
《机床与液压》
北大核心
2015年第1期12-15,共4页
Machine Tool & Hydraulics
基金
国家自然科学基金资助项目(50975191)
关键词
高速铣削
锯齿形切屑
本构模型
有限元仿真
High-speed milling
Saw-tooth chip
Constitutive model
Finite element simulation
