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
B21C37/04—Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of rods or wire
Landscapes
Engineering & Computer Science
(AREA)
Mechanical Engineering
(AREA)
Cooling Or The Like Of Semiconductors Or Solid State Devices
(AREA)
Procede et appareil pour la fabrication de tubes a surface externe agrandie, a points de depart d'ailettes helicoidales multiples, notamment pour tubes evaporateurs d'echangeurs de chaleur
Procédé de formation, sur un tronçon de tube, d'au moins une ailette hélicoïdale faite d'une seule pièce avec le tube, et rouleau de façonnage pour la mise en oeuvre de ce procédé