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传统超声加工用工具或者很短,或者按半波长整数倍叠加.加工中工具长度的大量磨损会明显降低加工效率,因而必须经常更换工具.本文提出一种新型的超声加工深小孔的工具系统,能以特殊的方式工作.工具长度任意,加工中工具长度变化允许达80％;仅仅需要适当调节电发生器频率就能良好工作.本工具系统已成功地用在超声加工玻璃深小孔(圆形和异形孔),在玫璃上加工出直径6mm、深达280mm的孔.加工效率至少可以与常规方法相比. 观测了具有等截面细长杆的复合振动系统的频率特性和工具系统的振动模式,得出了工具杆“局部共振”的结论.初步探讨了产生这种共振的条件及其形成机理. 局部共振现象,应当还可用在高功率超声的其它场合.
Traditional tools for ultrasonic machining are either very short or half-wavelength integral multiples. Large amounts of tool wear during machining can significantly reduce machining efficiency and therefore tools must be replaced frequently.This paper presents a new tooling system , Can work in a special way. The length of the tool is arbitrary, the length of the tool is allowed to change up to 80% during processing, and it only works well when the frequency of the electrical generator is properly adjusted. The tool system has been successfully used in ultrasonic machining of deep holes in glass Round and shaped hole), the diameter of the glass 6mm, the depth of up to 280mm hole processing efficiency at least with conventional methods compared to observe the cross-section slender rod composite vibration system frequency characteristics and tool system The conclusion is drawn that the tool bar “local resonance” is the conclusion.The condition of resonance and its formation mechanism are discussed preliminarily.The phenomenon of local resonance should also be used in other occasions of high power ultrasound.