Method and apparatus for polishing an internal surface of an aluminum extrusion hollow shape

摘要

There is provided an electrolytic integrated polishing apparatus which enables high precision polishing of the internal surface of a long sized cylindrical workpiece such as a metallic tube. The apparatus includes a work supporting unit for disposing the cylindrical workpiece, so that the axial center of the cylindrical portion is aligned with the vertical direction, a rotation shaft supported downward along the vertical direction and free-rotatably supported in an external tube which is freely movable along the vertical direction, a tool electrode including a grindstone directed to radial directions, attached to the tip of the rotation shaft, and a plastic tube wound around the external surface of the external tube for pressurization.