Ring gear and manufacturing method for such a ring gear

Details Ring gear and manufacturing method for such a ring gear Ring gear and manufacturing method for such a ring gear

B - Operations, Transporting

21

D

B21D 22/00 (2006.01) B21D 53/26 (2006.01) B21K 1/30 (2006.01) B23P 15/14 (2006.01)

Patent

CA 2554662

A method of manufacturing a forged article (10) including a surface (18). The method includes defining a negative tooling pattern (52) based on the surface and providing a tooling set (28) having an anvil (30) and top (36)and bottom die (34). An upper surface (40) of the bottom die conforms to the negative tooling pattern. When the tooling is assembled the anvil extends through the bottom die and defines an axis. Additionally, the bottom and top dies cooperate to define a die cavity (76). A hollow blank (38) is preheated and placed on an anvil and into the die. In a single stroke, the hollow blank is pressed between the top and bottom dies in a pressing direction that is parallel to the axis. The preheating temperature Tw is a function of the homologous temperature ratio Tw/Tm is between .62 and .80, where Tm is the absolute melting temperature of the alloy.

L'invention concerne un procédé de fabrication d'un article forgé (10) comprenant une surface (18). Ledit procédé consiste à définir un modèle d'outillage négatif (52) reposant sur la surface et à utiliser un ensemble outillage (28) présentant une enclume (30) et une matrice supérieure (36) et inférieure (34). Une surface supérieure (40) de la matrice inférieure correspond au modèle d'outillage négatif. Lorsque l'outillage est assemblé, l'enclume s'étend dans la matrice inférieure et définit un axe. De plus, les matrices inférieure et supérieure coopèrent afin de définir une cavité de matrice (76). Un flan creux (38) est préchauffé et placé sur une enclume et dans la matrice. En un seul coup, le flan creux est pressé entre les matrices supérieure et inférieure dans un sens de pressage qui est parallèle à l'axe. La température de préchauffage Tw dépend du rapport de température homologue Tw/Tm compris entre 0,62 et 0,80, Tm représentant la température de fusion absolue de l'alliage.

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