Modelling and prevention of chatter vibration of milling machines

计算机数字控制(CNC)机床在加工过程中可能会遇到刀具/工件的不必要的颤振或自激共振振动。如果控制不当，振动会导致工件表面光洁度差，降低加工精度，降低刀具和数控机床的使用寿命，甚至损坏刀具和机床。颤振的发生受机床动态响应的影响很大。本项目的目标是开发一个数值模型来描述数控机床的切割速度和主轴速度之间的关系，以便绘制出稳定波瓣图。该模型将由刀具和工件之间的相互作用产生的不断变化的切削力来激励。该模型的稳定性将通过在仪表化数控铣床上进行的切割试验结果来验证。该项目的成功将为绘制稳定波瓣图提供一种新的工具。该项目的成果将增强产业合作伙伴的市场竞争力，并培养两名相关领域的高素质人才。

Computer Numerical Control (CNC) machines may experience unwanted chatter or a self-excited resonant vibration of tools/workpieces during the machining processes. If not properly controlled, the vibrations can lead to a poor surface finish on the workpiece, deteriorate the machining accuracy, reduce the life of tools and CNC machines or even damage the tools and machines. The chatter occurrence is strongly affected by the dynamic response of the machine and tools. The objective of this project is to develop a numerical model to characterize the relationship between the cut and spindle speed of CNC machines in order to map out stability lobe diagram. The model will be excited by regenerative, time-varying cutting forces from the interaction between tools and workpieces. The stability obtained by the model will be validated by the results of cutting tests conducted on the instrumented CNC milling machine. The success of this project will provide a novel tool to map the stability lobe diagram. The outcome of this project will enhance the industrial partner's market competitiveness and train two highly qualified personnel in the related field.