A device for gear fabrication by hot rolling, on presses

Abstract

Abstract The paper presents in detail a device that attaches to a press, produces a toothed wheel (with a crown similar to a toothed wheel with right teeth) starting from a cylindrical steel bar by hot rolling. The device has been patented by OSIM Romania and the file has the number: 129217 since 29.01.2016. By design, the device allows to make a single type of toothed wheel (with a specific module and pitch, a certain addendum and dedendum) having a limited maximum volume (consequence of a finite width), but its achieving by hot rolling cedes a high economic efficiency performance as well as a good dimensional tolerance. Moreover, as a consequence of the fibrous structure of the product (the rolled gear) developed along each tooth, we can assume that the toothed wheel response to the mechanical stresses within the gearing it belongs to is superior to any variant of its accomplishment at present. In the present work the construction of a device for gear fabrication by hot rolling in detailed, a device which is finally attached to a mechanical press. Previously, with a preliminary prototype attached to a mechanical press, toothed wheels-with right teeth, has been manufactured by pure pressing. We had viewed its weaknesses. The present device transforms the deforming process of the metal rod into a pure hot-rolling process, in which not only the metal rod is engaged between deforming rollers, but rather are engaged deforming rollers, thus providing the formation of teeth.