PROCEDIMENTO E DISPOSITIVO PER LA REALIZZAZIONE DI UN'ASTA DENTATA.

摘要

A process for the manufacture of a rack, specially a rack having variable transmission, wherein the teeth of the rack have in the central area a profile different from that of the outer portions. The rack is formed from a blank in a press having an upper die and a lower die. The rack is manufactured by cold-mold pressing and one die portion carries out, during the pressing operations, a wobbling movement over the blank. In an apparatus for carrying out the process, a die forms the negative mold for the lower portion of the rack to be manufactured. In the other die is molded in negative mold the toothed profile of the rack to be manufactured.