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
B21C23/21—Presses specially adapted for extruding metal
B21C23/211—Press driving devices
B—PERFORMING OPERATIONS; TRANSPORTING
B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
Procede et dispositif de rivetage utilisant un rivet-ebauche et comportant un systeme de compensation du flechissement d'un cadre utilise pour le refoulement du rivet.
Procede et appareil pour introduire du ciment dans un trou de forage de maniere a realiser le boulonnage de la roche, moyennant l'utilisation de ciment