| 摘要 |
Provided are a processing method and processing apparatus for a cylindrical workpiece for which concentricity with respect to the inner circumferential surface during processing of the outer circumferential surface of the cylindrical workpiece is ensured. The processing apparatus is equipped with: a hollow main spindle (2), which is supported inside a main shaft unit (11) so as to rotate freely and which has a driving center (9) on the leading end of which a tapered surface (9a) is formed; a core-pressing spindle (12), which is supported inside a centering unit (16) so as to rotate freely and move freely in the axial direction and which has an alignment center (15) on the leading end of which a tapered surface (15a) is formed; and a shaft-shaped lathe carrier (19), which is supported in the inner hole (17) of the main spindle so that relative rotation is not possible and so as to move freely in the axial direction. In addition to the main spindle and the core-pressing spindle being disposed on the same axial line, the drive center and the alignment center are engaged with the inner circumference of the ends of the workpiece (W) and are supported by the inner circumference. With the lathe carrier engaged from the inner circumferential side of the workpiece, the workpiece is rotated while the outer circumferential surface of said workpiece is finished. |
