Machine tool and workpiece inner surface machining method using the machine tool

Abstract

To provide a machine tool including a workpiece inner surface machining tool which is not only capable of machining an inner surface of a workpiece into a spherical shape but also capable of machining a bearing surface which is a flat surface and machining the combination of a spherical surface and a flat surface. A machine toolmachines a surface to be machined mlocated on an inner surface of a workpieceby a toolhaving: a supporting member; a cutting toolwhich is supported to be pivotable about a support shaftlocated on a plane b' perpendicular to an axis a of the supporting memberand has a cutting edgeat one end; a drive shaftpivoting the cutting toolby moving in an axis a direction; and a link member. The toolis supported by a tool post, the drive shaftis movable in the axial direction by the movable base, and an axial position of the movable baseand an axial position of the tool postare controlled so as to cause a machining point P by the cutting edgeto move along a desired machining line while the workpieceis rotated by the spindle headstock