高速铣削稳定性的不确定性建模及实验预测  

Uncertainty modeling and experimental prediction of machining stability in high speed milling process

作　　者：曹自洋[1] 李华[1] 殷振[1] 汪帮富[1] 

机构地区：[1]苏州科技学院机械工程学院,江苏苏州215009

出　　处：《制造技术与机床》2015年第4期154-158,共5页Manufacturing Technology & Machine Tool

基　　金：国家自然科学基金资助项目(51305286);苏州市科技计划资助项目(SYG201244);"青蓝工程"资助项目

摘　　要：高速铣削加工过程的颤振不稳定性是制约刀具寿命和加工效率的主要因素。传统的颤振稳定性预测模型都假设系统参数是恒定的,但是在实际的高速铣削过程中,影响加工稳定性的参数会随着高主轴转速、高系统动态特性而发生变化。为提高铣削加工精度,以高速铣削加工稳定性为研究对象,考虑参数不确定性的影响,应用棱边定理和排零准则,建立高速铣削变参数稳定性预测数学模型。在此基础上,通过模态测试和辨识铣削力系数获得固有频率及切削系数的变动范围,然后采用数值分析和铣削实验相结合的方式,验证了建立的高速铣削变参数稳定性模型的正确性。Regenerative chatter is a major factor restricting the process efficiency and the longevity of cutting tools in high speed milling process. But the majority of the traditional models used to predict chatter stability assume that parameters remain constant. In reality,the parameters affecting the machining stability vary with the high spindle speed and dynamic characteristic. For the research of high speed milling stability to improve machining accuracy,the dynamic chatter stability analytical model based on uncertainty parameters using the edge theorem and the zero exclusion condition is constructed. Furthermore,the variation of natural frequency and cutting coefficients are obtained via modal testing and identifying the cutting force coefficients. Finally,the correctness of high speed milling system stability model with parameter uncertainty is validated through the combination of numerical analysis and experimental method.

关 键 词：高速铣削 动态特性 不确定性 稳定性预测 

分 类 号：TG54[金属学及工艺—金属切削加工及机床]