变齿距铣刀高速微铣削的动态特性及稳定性研究（英文）

Research on dynamics and machining stability in high speed micro milling with variable cutter pitch

在高速微铣削加工过程中,提高生产效率和零件质量的需求日益强烈,这使得机床一直在系统的动态稳定性极限附近工作,而机床颤振的存在是限制微铣削加工生产率的主要障碍。基于颤振稳定性的准确预测,能采取一些措施来提高动态稳定性极限,例如通过改变铣刀结构。提出了数值分析与铣削实验相结合的方法,采用变齿距微铣刀来研究铣削加工的动态特性和稳定性。另外提出了采用时域仿真的输出力来表征加工稳定性的新方法,采用变齿距铣刀可以非常有效地提高某些速度范围的颤振稳定性。对于选定刀具的加工,这种方法可以用于加工优化,或在设计阶段预测刀具新型结构的性能。

The strong demand for increasing productivity and workpiece quality in high speed micro milling process makes the machine-tool system perform close to the limit of its dynamic stability. A major obstacle that limits the productivity in machining operations is the presence of machine tool chatter. Some practices should be conducted to improve the dynamic stability limits based on predicting chatter stability accurately,e. g.,variable cutter structure. In this study a numerical analysis and experimental method is present to investigate the dynamics and machining stability in micro milling with variable pitch end mills. A new approach to represent machining stability using the force output of the time domain simulation is also described. Milling cutters with variable pitch angles can be very effective in improving stability against chatter for certain speed ranges. The method can be used for process optimization for a given tool or at the design stage to predict the performance of new geometries.