Patent ID: 8479621
Filing Date: 2013-07-09
Classification: B23B,Y10T

Abstract:
1. An internal machining apparatus for machining an internal surface of a hollow workpiece, the apparatus comprising: a work head rotatably supporting a work spindle for rotationally driving the hollow workpiece; a foot stock provided to face the work head; a machining unit holding a cutting blade and configured to be inserted into the hollow workpiece; a pair of unit holding arbors respectively supported by the work head and the foot stock to advance and retract in an axial direction thereof and being capable of non-rotatably holding the machining unit inserted in the hollow workpiece at both sides thereof; and a turning mechanism configured to be supplied with a drive power transmitted through the interior of one of the unit holding arbors for turning the cutting blade held on the machining unit about an axis orthogonal to an axis of the unit holding arbors.