F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
F42B30/00—Projectiles or missiles, not otherwise provided for, characterised by the ammunition class or type, e.g. by the launching apparatus or weapon used
F42B30/08—Ordnance projectiles or missiles, e.g. shells
B—PERFORMING OPERATIONS; TRANSPORTING
B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
B21D22/14—Spinning
B21D22/16—Spinning over shaping mandrels or formers
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