B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
B21J5/10—Piercing billets
B—PERFORMING OPERATIONS; TRANSPORTING
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
Verfahren zur herstellung eines hohlteils aus einem metallischen werkstoff und verwendung dieses verfahrens zur herstellung einer fahrwerksstange oder eines fahrwerkträgers
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