Patent ID: 9033770
Filing Date: 2015-05-19
Classification: B23B,B24B

Abstract:
1. A combined processing tool comprising: a shank formed to be a cylindrical shape to be attached to a machine tool; a mandrel fixed to the shank, the mandrel comprising an outer peripheral region including an outer peripheral surface, and a concave and convex shape area of an approximately polygonal shape essentially consisting of concave parts and convex parts alternately arranged in a circular direction of the mandrel; a frame equipped outside an outer peripheral surface of the mandrel so as to be capable of rotating relatively to the mandrel; a burnishing unit configured to perform burnishing to an inner peripheral surface of a workpiece with rollers held kept in the frame; a dimple forming unit configured to perform dimple forming to the inner peripheral surface of the workpiece with balls kept in the frame so as to freely appear from and disappear in the frame; a body fixed to a top portion of the shank; and a skiving unit arranged at the body and configured to perform cutting, wherein the rollers and the balls are alternately arranged in a circular direction of the frame so as to be engaged with the concave and convex shape area, and the concave parts and the convex parts of the concave and convex shape area alternately engage the balls according to a rotation of the mandrel, wherein when each of the concave parts of the concave and convex shape area contacts with an associated one of the balls, each of the concave parts makes the associated one in a non-contact state with the workpiece, and when each of the convex parts of the concave and convex shape area contacts with an associated one of the balls, each of the convex parts makes the associated one in a contact state with the workpiece, and wherein the rollers are disposed so that