Direct Drive Mechanism of EDM Electrode Utilizing Elliptical Movement.

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  • 楕円運動を利用した放電加工用電極ダイレクトドライブ方式
  • ダエン ウンドウ オ リヨウシタ ホウデン カコウヨウ デンキョク ダイレクト

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Abstract

This paper deals with a linear direct drive mechanism of an electrode for electrical discharge machining (EDM) utilizing elliptical movement. This device has two elliptically moving units with piezoelectric elements. It drives the electrode by pinching the electrode synchronously. The electrode moves several micrometers in each cycle with the response of kilohertz order. A locus of a driving pad of the elliptically moving device is examined in experiments and in the calculation with the finite element method. The figure of the locus depends on the difference of the stiffness of each moving unit. The frequency at minimum movement of the electrode is almost the same of the resonance frequency of the electrode in bending mode. Holes of 1 mm in diameter can be machined with the device in a stainless steel plate of 0.1 mm in thickness in 30 s. Electrode feeding devices for machining small holes can be miniaturized and their response can be improved with this mechanism.

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