Sintered coupling ring

A method for producing a coupling ring by means of powder metallurgy, comprising a ring of coupling teeth which comprise relieved flanks extending from wedge-shaped end faces and, on the side opposite the wedge-shaped end faces, a stop that protrudes radially beyond the tooth tip, with the coupling ring sintered from a pressed powder blank being calibrated between two axially acting calibration tools, wherein the powder blank is pressed and sintered in the axial direction with an excess portion (7) in the region of the stops (5) protruding radially beyond the tooth tips (6), and wherein the stops (5) sintered with an excess portion (7) are compressed to the reference dimension during the calibration process.

A calibration tool for producing a sintered coupling ring, comprising a ring of coupling teeth with relieved flanks extending from wedge-shaped end faces and stops protruding radially beyond the tooth tip on the side opposite of the wedge-shaped end faces, two molds which can be axially pressed against one another and accommodate the coupling ring between themselves, of which one forms the hollow mold for the coupling teeth in the region of the wedge-shaped end faces and the other the hollow mold for the coupling teeth in the region of the relieved flanks, with the dividing surface between the two molds extending along the transition between the wedge-shaped end faces and the adjacent relieved flanks, wherein the mold (8) accommodating the wedge-shaped end faces (3) of the coupling teeth (2) forms the mold protrusions (11) for the face side of the stops (5) which protrude beyond the dividing surface (10) determined by the transitional region between the wedge-shaped end faces (3) and the relieved flanks (4), and wherein the mold protrusions (11) of the other mold (8) and the recesses (12) for the mold protrusions (11) in the other mold (9) converge into the dividing surface (10) via wedge surfaces (13, 14) extending in the radial direction.