Process for powder metallurgic manufacture of a coupling body

B - Operations – Transporting – 22 – F

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B22F 5/08 (2006.01) B21K 1/30 (2006.01)

Patent

CA 2379635

A process for powder metallurgic manufacture of a coupling body (1) with a crown (2) of coupling teeth (3) is described, whose flanks (5) going out from wedge- shaped end faces (4) are in relief, such that a formed body with coupling teeth (3), which have wedge-shaped end faces (4), but flanks (5) parallel to axis, is pressed out of a sintering powder and sintered to a molded blank, whose coupling teeth (3) for forming the flank reliefs are subjected to axial compression molding between two form tools (9, 10) on the one hand for the wedge-shaped end faces (4) and on the other hand for the flank reliefs. To create advantageous processing conditions it is suggested that during compression molding of the flank reliefs in the transition region between the flanks (5) and the wedge-shaped end faces (4) a flank-side interlocking shoulder (7), with a rounded transition (8) to the wedge-shaped end faces (4) and lying in the mold surface (11) of the form tools (9, 10), is pressed into the flanks (5) of the coupling teeth (3).

L'invention concerne un procédé permettant de produire, selon la technique de la métallurgie des poudres, un corps d'accouplement (1) comportant une couronne (2) de dents d'accouplement (3), dont les flancs (5) partant de faces (4) cunéiformes présentent une obliquité (dépouille). Selon ledit procédé, une pièce agglomérée comportant des dents d'accouplement (3) qui présentent des faces (4) cunéiformes mais des flancs (5) parallèles à l'axe est obtenue par pressage d'une poudre à fritter, et frittée pour former une ébauche dont les dents d'accouplement (3), pour la formation de leurs dépouilles de flanc, subissent un formage à la presse axial entre deux outils de formage (9, 10), d'une part pour les faces (4) cunéiformes et, d'autre part, pour les dépouilles de flanc. Ce procédé se caractérise en ce que lors du pressage de formage des dépouilles de flanc, dans la zone de transition entre les flancs et les faces cunéiformes, un épaulement rentrant côté flanc, situé dans la face de joint des outils de formage, présentant une forme arrondie de transition avec les faces cunéiformes, est formé par compression dans les flancs des dents d'accouplement.

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