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
B21C37/16—Making tubes with varying diameter in longitudinal direction
B21C37/18—Making tubes with varying diameter in longitudinal direction conical tubes
Matrice et mandrin a pas de pelerin pour la fabrication d'un tube amortisseur de descente pour un assemblage de combustible nucleaire, tube amortisseur, procede de fabrication des matrice et mandrin
Procede de fabrication d'une cremaillere comprenant une denture a pas variable mettant en oeuvre une etape d'ebauche suivie d'une etape de finition et un outil de brochage hélicoïdale