PROCESS, APPARATUS AND TOOL FOR CUTTING A TUBULAR BAR

摘要

A process carried out by an apparatus for cutting a tubular bar comprises a first cutting stage performed by a first disc-shaped rotary cutting tool, oriented so as to rotate about an axis parallel to a line of extension of the bar and also mov able gradually along the contour of the bar, which is made to penetrate into the peripheral wall of the bar over a distance less than the thickness thereof, forming a g roove therein. In a second and successive cutting stage, a second stationary cutti ng tool, oriented transversely with respect to the line of extension of the bar and m ovable along the contour of the bar inside the groove, is made to penetrate into th e remaining thickness of the peripheral wall so as to cause gradual shearing o f the bar.