放電ワイヤカットのワイヤ挙動に関する研究 (第1報)

ワイヤ振動と放電現象

抄録

For improving the performance of wire-EDM, the behaviour of wire electrode in working gap have to be investigated. But there have not been any paper dealing with its dynamic behaviour. The existence of electrical or optical noise in working gap have disturbed direct measurement of wire behaviour.
The authors have successed to measure the wire behaviour directly and taken notice of the relationship between wire vibration and discharge phnomena by spectrum analysis of both wire vibration and smoothed discharge current.
In conclusion following things are found out. Wire vibration occurs when machining sturts and is not affected by wire feeding and machining water supply. The amplitude of wire vibration along right-angled direction of machining is always bigger than that along machining direction. Wire vibration has inherent component on wire feeding system and uninherent one. The frequency of inherent component is equal to twice of that of vibration of normal mode. Smaller the amplitude becomes, higher the frequency of uninherent component becomes. There is close relationship between the amplitude of wire vibration and the width of machining gap. There is also close relationship between uninherent component of wire vibration along machining direction and periodic discharge concentration.