B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES, PROFILES OR LIKE SEMI-MANUFACTURED PRODUCTS OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
B21C37/00—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
B21C37/06—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
B21C37/15—Making tubes of special shape; Making tube fittings
B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
B21C37/29—Making branched pieces, e.g. T-pieces
B21C37/292—Forming collars by drawing or pushing a rigid forming tool through an opening in the tube wall
Procédé et dispositif de tronçonnage d'une pièce tubulaire de grand diamètre en matériau rigide notamment à section ovalisée, telle qu'un tuyau en fonte
Procede et dispositif pour accoster la section circulaire d'extremite d'une virole cylindrique avec la section circulaire d'un fond de virole en vue de leur assemblage par soudure