The Development of a Ultrasonic Vibration Assisted Cutting Head with Resonance Frequency Detection

• Main Authors: Zong-xun Guo, 郭宗勳
• Other Authors: Jenq-shyong Chen
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/92906082706057613897

碩士 === 國立中正大學 === 機械工程所 === 98 === 　　Ultrasonic-vibration assistant(UVA) has been applied to the optical device cutting, hard-to-cut materials, diamond cutting of steel, micro-structuring, and micro-hole drilling processes which are prove that UVA ''s specific characteristics since UVA cutting theory has been verified. In Japan, Germany had commercial mass-production standards in the ultrasonic processing equipment, for example: the commercialization of ultrasonic drilling equipment has its vibration frequency of 27kHz, the amplitude of 10μm.Our goal is to develop an one-dimension UVA cutting head which can generate a frequency above 20kHz, the amplitude more than 10um. 　　In this study, using Langevin vibrator as UVA cutting head actuators,which UVA cutting head to use stepped horn to amplify vibration and cutting tool as a part of it, between the use of cutting tool and horn locking collet. From the results, locking collet forces and cutting tool in the horn of an extension of the length are important factors that affect the resonance, in this study for the extension length to be explored. 　　In this study, the cutting tool extends the original design of 30mm, resonance frequency of 24kHz, form the experiment, under the extension of the resonant frequency 23.05kHz, amplitude 17.47μm to conform the initial design goals; When the cutting tool extended to 48mm, the resonance frequency of 20.12kHz, maximum amplitude of 33μm, as mention before the two resonant modes belong to 20kHz~48kHz frequency bands of mode 1. 　　From the references, we had known that when the resonance happens to the RLC harmonic circus, the phase shift between the electric current and voltage is zero. According to this theory, after using electric current and voltage to catch the circus, we can get two square waves including phase data. When measuring vibration, even if the UVA cutting device didn’t catch vibration changing data, we can still find out whether there is resonance or not by the phase shifts of square waves. There is an important basis to find out the resonance when the phase shift of electric voltage and current is zero at the resonance frequency by changing driven voltage frequency to observe the relation between electric voltages, currents and amplitudes.