Method for forming tapered piston pins

Details Method for forming tapered piston pins Method for forming tapered piston pins

B - Operations, Transporting

21

C

B21C 23/14 (2006.01) B21C 25/02 (2006.01) F16J 1/16 (2006.01)

Patent

CA 2589659

A method is provided for cold forming center web or webless tapered piston pins in one forming sequence. The method eliminates secondary operations such as but not limited to machining, annealing, coating and secondary forming. The method includes the steps of cutting a metal rod into a substantially cylindrical slug piece, die extruding the slug piece to form a first cavity in the slug piece, optionally die extruding the slug piece to form a second cavity in the slug piece, piercing the slug piece to form the slug piece into a hollow cylindrical piece, die extruding the hollow cylindrical piece at either end to form a hollow cylindrical piece having a taper on an internal surface of the hollow cylindrical piece at either end.

Méthode de façonnage à froid des axes de piston coniques à âme centrale ou sans âme en une séquence de façonnage. Cette méthode permet de supprimer les opérations secondaires, notamment l'usinage, le recuit, le revêtement et le façonnage secondaire et comprend les étapes suivantes : découpe d'une tige métallique en un pion cylindrique, extrusion du pion pour former une première cavité dans celui-ci, extrusion facultative du pion pour former une deuxième cavité dans celui-ci, perçage du pion pour former une partie creuse cylindrique, extrusion de la partie creuse cylindrique à chaque extrémité pour former une partie creuse cylindrique à la surface interne conique.

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