| 摘要 |
Provided is an electrolytic polishing method for a hollow tube having a variable internal diameter. At least one wing having a tip which corresponds to the internal shape of the hollow tube and having a predetermined width in the axial direction of the electrode shaft is positioned at equal intervals in the circumferential direction to constitute a wing electrode. Moreover, a housing tube which houses the wing electrode is positioned concentrically with the electrode shaft, with each wing wound around the electrode shaft. The housing tube is equipped with slits in the axial direction at positions corresponding to each of the wings, and comprises a diameter-adjusting means in which the electrode shaft and housing tube are rotated relative to one another with each of the wings passing through the slits, enabling each of the wings to be expanded and contracted in the radial direction. This electrode is inserted into the hollow tube while housed in the wing electrode housing tube, and the tip of the wing electrode is pushed out from the housing tube to obtain an appropriate distance from the inner surface of the hollow tube to carry out polishing, and polar voltage/current for polishing are applied between the hollow tube and the wing electrode. As a result of this configuration, the distance between the hollow tube and the electrode is made uniform over the entirety of the hollow tube, making it possible to polish all areas of the hollow tube uniformly and over a short period of time. |
