Gears

B - Operations – Transporting – 22 – F

Patent

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Details

B22F 5/08 (2006.01) B22F 3/11 (2006.01) B21H 5/02 (2006.01)

Patent

CA 2255643

A powder metal gear wheel having a core density of at least 7.3 g/cc, and in one embodiment 7.4 to 7.6 g/cc and a hardened carburized surface. A method of manufacturing transmission gears comprises, sintering a powder metal blank to produce a core density of between 7.4 to 7.6 g/cc, rolling the surface of the gear blank to densify the surface, and then heating the rolled sintered part and carburizing in a vacuum furnace.

Un engrenage constitué de poudre métallique a une densité d'âme égale à au moins 7,3 g/cm<3>, et, dans l'un des modes de réalisation, comprise entre 7,4 et 7,6 g/cm<3>, et une surface carburée durcie. Selon un procédé permettant de fabriquer des transmissions intermédiaires, on fritte une ébauche de poudre métallique de façon à obtenir une densité d'âme comprise entre 7,4 et 7,6 g/cm<3>, on lamine la surface de l'ébauche d'engrenage de façon à densifier sa surface, puis on chauffe la partie frittée laminée et on la carbure dans un four à vide.

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