Modelling and prevention of chatter vibration of milling machines

铣床颤振的建模与预防

• 批准号: 479597-2015
• 负责人: Zhu, ZhengHong
• 金额: $ 1.82万
• 依托单位: York University
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=580169
• 关键词: Modelling; prevention; chatter; vibration; milling

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.

计算机数控机床在加工过程中可能会遇到不必要的颤振或刀具/工件的自激共振振动。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。本项目的目的是建立一个数值模型来表征数控机床的切削与主轴转速之间的关系，以便绘制稳定波图。该模型将被刀具和工件之间的相互作用产生的再生的时变切削力所激发。该模型获得的稳定性将通过在数控铣床上进行的切削试验结果进行验证。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伙伴的市场竞争力，并在相关领域培养两名高素质人才。