Modelling and prevention of chatter vibration of milling machines

计算机数控（CNC）机床在加工过程中可能会经历不必要的颤振或刀具/工件的自激共振。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，减少刀具和CNC机床的寿命，甚至损坏刀具和机床。机床和刀具的动态响应对颤振的发生有很大的影响。本计画的目的是发展一个数值模式来描述数控机床的切削量与主轴转速之间的关系，以绘制稳定性波瓣图。该模型将由刀具和工件之间相互作用产生的再生、时变切削力激励。在数控铣床上进行的切削试验结果验证了该模型的稳定性。该项目的成功将为绘制稳定性波瓣图提供一种新的工具。该项目的成果将提高工业合作伙伴的市场竞争力，并在相关领域培养两名高素质的人才。

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.