Method of making a pulley, apparatus for making the same and pulley so produced.

摘要

The invention relates to a method for manufacturing a multiple- groove pulley (2), according to which the metal of the peripheral portion (52) of a flat circular disc (20) is made to flow (plastically deformed) by pushing back the peripheral portion of the disc until a cylindrical flank (8), coaxial with the disc and extending on either side of the latter, is formed and then a series of grooves is formed in the external surface of the flank. In the step consisting in forming the cylindrical flank, at least one radial rim (66) is also formed extending outwards from at least one of the edges of the flank, and then the rim is subjected to a forming operation which is performed either before the groove-forming step or after the latter. The invention also relates to a device for the implementation of the method and a pulley obtained according to the method. <IMAGE>