Method and device for the manufacture of bends ma rques, in particular on bends in the steel tube obtained by welding

摘要

P process for the manufacture of bends marked on the basis of the straight tubular sections. / p & & p & the straight tubular sections 1, which on a press to be bent is known per se are slid by an advancing mechanism 6 on a guide bar 2 and on a mandrel of a bending following the latter, are pushed by the advancing mechanism 6 on the guide bar 2 with at least one marker of the rotary member 10 and are marked in a zone at least approximately neutral. / p & & p & the invention is applicable in particular on bends made of steel tubing. / p