B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
B21B—ROLLING OF METAL
B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
B21B39/14—Guiding, positioning or aligning work
B21B39/16—Guiding, positioning or aligning work immediately before entering or after leaving the pass
Outil de vissage automatique de goujon comportant des machoires evitant la deformation du filetage du goujon et procede pour eviter la deformation de ce filetage dans cet appareil