To provide an apparatus for precisely forming fine recessed parts on the circumferential surface of a workpiece and capable of achieving reduction of forming cost.
The apparatus for forming the fine recessed parts on the inner circumferential surface Ba of a cylindrical bore CB comprises a form roller 13, a roller supporting member 12, a tool holder 13, a compressed coil spring 16 as the roller press-contacting means, a central axis 3 for rotating the tool holding 10 and a central axial head 2 for moving the tool holder 10 in the axial direction. On the inner circumferential surface Ba having different diameter, the fine recessed parts having the same prescribed pattern are formed by changing the moving speed of the central axial head 2 according to the diameter of the cylindrical bore CB.
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UEHARA YOSHITAKA
OTA MINORU
