Extension of Curved Hole Length by Means of Electrical Discharge Machining Using an In-Pipe Movable Device

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  • 管内走行機構を用いた放電加工による曲がり穴の延長
  • カンナイ ソウコウ キコウ オ モチイタ ホウデン カコウ ニ ヨル マガリ アナ ノ エンチョウ

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The study deals with the development of an in-pipe movable device to extend the length of a curved hole machined by means of the method proposed by the authors. To establish a curved hole machining method, authors have developed the device installed on an electrical discharge machine, which can make an electrode move along a curved trajectory with electrical discharge machining performed. This results in the fabrication of curve holes. However, the length of the curved holes is limited. Thus, the in-pipe movable device is developed to overcome the limitation. The device has a flexible body whose head is equipped with a spherical electrode and whose circumference is furnished with tiny bearings through leaf springs. It can run through a curved hole and make it longer by machining the bottom of the curved hole. From the experimental results, it is found that the device can perform a stable electrical discharge machining and extend the curved hole length.

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