| 摘要 |
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 tool 1 machines a surface to be machined m1 located on an inner surface of a workpiece 21 by a tool 20 having: a supporting member 22; a cutting tool 23 which is supported to be pivotable about a support shaft 19 located on a plane b′ perpendicular to an axis a of the supporting member 22 and has a cutting edge 23a at one end; a drive shaft 24 pivoting the cutting tool 23 by moving in an axis a direction; and a link member 25. The tool 20 is supported by a tool post 5, the drive shaft 24 is movable in the axial direction by the movable base 4, and an axial position of the movable base 4 and an axial position of the tool post 5 are controlled so as to cause a machining point P by the cutting edge 23a to move along a desired machining line while the workpiece 21 is rotated by the spindle headstock 3.
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