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
B21C23/00—Extruding metal; Impact extrusion
B21C23/02—Making uncoated products
B21C23/03—Making uncoated products by both direct and backward extrusion
Procede de moletage coupant ou deformant, et des moyens de mise en oeuvre, destines a moleter ou rainurer des alesages ou portees cylindriques de pieces
Presse pour le crantage d'un tube comportant en combinaison un mandrin introduit a l'interieur du tube et une piece conformee selon le cran a realiser.