超声加工中局部共振机理的模拟试验研究  

Research on Simulation Test of Local Resonance Mechanism in Ultrasonic Machining

作　　者：郑建新[1] 徐家文[1] 刘传绍[2] 赵波[2] 

机构地区：[1]南京航空航天大学机电学院,南京210016 [2]河南理工大学机械与动力学院,焦作454000

出　　处：《南京航空航天大学学报》2006年第5期644-648,共5页Journal of Nanjing University of Aeronautics & Astronautics

基　　金：江苏省自然科学基金(BK2001048)资助项目;河南省自然科学基金(004040400)资助项目

摘　　要：通过建立数学物理模型分析超声加工声学系统的动力学规律,探讨工具杆的局部共振现象,得出当工具杆发生局部共振时,变幅杆和工具杆连接处为位移节点,且此时系统处于谐振状态的结论;并推导了超声波发生器的可调频率范围与刀具杆的磨损率关系。试验利用细杆(45#)来模拟工具杆,验证了工具杆发生局部共振时,谐振频率相当接近工具杆一端固定、一端自由时的某一固有频率;并通过改变细杆的长度来模拟工具杆的磨损,验证了超声波发生器的可调频率范围与刀具杆的磨损率之间的关系。The phenomenon of local resonance of a tool rod is studied through establishing the mathematical model to analyze the kinetics laws of the acoustic system in the ultrasonic machining. It is concluded that when the local resonance occurs, the connection at the horn and the tool is a displacement node, and the system is under a resonant condition. The relationship between the adjustable frequency range of the ultrasonic generator and the wear ratio of the tool is deduced. Thin iron wires （45 #） are used as the substitute for tools and the corresponding test indicates that the resonant frequency of the acoustic system is very close to a certain natural frequency of the tool with one end fixed and the other end free when the local resonance occurs. The above relationship is testified through changing the length of the iron wires to simulate the wear of the tool.

关 键 词：局部共振 超声加工 模拟试验 动力学规律 

分 类 号：TH16[机械工程—机械制造及自动化]