Patent ID: 7328637
Filing Date: 2008-02-12
Classification: B21C,B23B,B24B,Y10T

Abstract:
1. An apparatus for machining a circumferential surface defining a cylindrical bore of a workpiece, the apparatus comprising: a tool holder rotatable about a first rotation axis; and a form roller supported on the tool holder so as to be rotatable about a second rotation axis parallel to the first rotation axis and a central axis of the cylindrical bore of the workpiece, the form roller having a diameter smaller than a diameter of the cylindrical bore of the workpiece, wherein the form roller is moveable in a direction perpendicular to the central axis of the cylindrical bore of the workpiece, and the form roller is turnable about the first rotation axis of the tool holder and is rotatable about the second rotation axis, while being pressed against the circumferential surface defining the cylindrical bore of the workpiece to thereby form a plurality of microscopic recesses on the circumferential surface defining the cylindrical bore during rotation of the tool holder.