PROCEDE ET MACHINE POUR DONNER UN PROFIL PREDETERMINE A LA SURFACE PERIPHERIQUE D'UNE PIECE SANS LA FAIRE TOURNOYER

PROCEDE ET MACHINE POUR DONNER UN PROFIL PREDETERMINE A LA SURFACE PERIPHERIQUE D'UNE PIECE 16 SANS LA FAIRE TOURNER.CE PROCEDE CONSISTE A FAIRE TOURNER AUTOUR DE LA PIECE EN QUESTION ET ENTRER EN CONTACT AVEC ELLE UNE FRAISE-MERE ROTATIVE 15 QUI LA TAILLE, ET CELA EN DEPLACANT PARALLELEMENT A L'AXE LONGITUDINAL DE LA PIECE 16 SOIT CETTE DERNIERE SOIT LA FRAISE 15.APPLICATION NOTAMMENT A LA TAILLE D'ENGRENAGES. Methods and apparatus according to the present invention enable the generation of predetermined shapes on the periphery on a non- rotating workpiece by orbiting a rotatable cutter about the workpiece and engaging the cutter with the workpiece. In a hobbing machine (10), a hob head (13) is rotated, through the interengagement of a planet gear (28) with a sun gear (29), by a drive shaft (14) which simultaneously rotates through a positive drive (33) a hob (15) mounted on an elongate arbor (41), the arbor (41) being located eccentrically of the hob head (13) and being movable in its axial direction to spread wear on the hob (15), a casing (11) of the machine (10) being movable lengthwise under the control of an actuator (11). Shaping machines are also described including rotated cutters whose orbiting is co-ordinated with their radial, lateral and/or lengthwise movements, as well as shaving machines including freely rotatable cutters.