To provide a method for drawing an outer cylindrical piece short in the axial direction which is unnecessary for replacing a tool for the difference in the outside diameter of the outer cylindrical piece, and capable of obtaining an excellent worked surface.
A vibration-isolating bush 1 is arranged movably in the axial direction and rotatably around the axis. Three or more drawing rollers 29 are arranged concentric with each other with respect to the axis of the vibration-isolating bush 1 while the axial directions are parallel to each other, and at least one drawing roller 29 is rotated. The drawing rollers 29 have a truncated conical shape with their outer circumferential surfaces being inclined so that the outside diameter is increased in the moving direction of the vibration-isolating bush 1, and the minimum diameter between the outer circumferences of the plurality of drawing rollers 29 around the axis L is smaller than the outside diameter of the outer cylindrical piece 2. The positions of the plurality of drawing rollers 29 are adjustable in the radial direction around the axis of the vibration-isolating bush 1. The vibration-isolating bush 1 is drawn when it is passed through the plurality of drawing rollers 29 in the axial direction.
COPYRIGHT: (C)2007,JPO&INPIT
KUNO AKIRA
YAMAMOTO KAZUTAKA
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