| 摘要 |
<p>A process carried out by an apparatus (1) for cutting a tubular bar (10) comprises a first cutting stage performed by a first disc-shaped rotary cutting tool (15), oriented so as to rotate about an axis (15a) parallel to a line (10a) of extension of the bar (10) and also movable gradually along the contour (10c) of the bar (10), which is made to penetrate into the peripheral wall (5) of the bar (10) over a distance less than the thickness (5s) thereof, forming a groove (8) therein. In a second and successive cutting stage, a second stationary cutting tool (25), oriented transversely with respect to the line (10a) of extension of the bar (10) and movable along the contour (10c) of the bar (10) inside the groove (8), is made to penetrate into the remaining thickness (5f) of the peripheral wall (5) so as to cause gradual shearing of the bar (10). <IMAGE></p> |
