C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 5/00 (2006.01) C21D 1/18 (2006.01) C21D 9/30 (2006.01) F16C 3/04 (2006.01)
Patent
CA 2683328
The invention relates to a method for producing a crankshaft, in special for diesel engines, wherein a crankshaft blank is produced from austempered ductile cast iron, the casting blank is subjected to heat treatment matched to the austempered ductile cast iron whereby the blank acquires high strength and hardness. According to the invention, surfaces which form bearing surfaces for connecting rods and shaft bearings are undersized before the ADI heat treatment. Following the heat treatment a coating is applied to the bearing surfaces, the layer thickness being matched to the undersize and dimensional deviations as a result of the heat treatment. The coated bearing surfaces are finally finish-machined to the finished size without the need of machining the bearing sufaces of the casting blank after the heat treatment.
La présente invention concerne un procédé de fabrication d'un vilebrequin, en particulier pour les moteurs diesel,une ébauche d'embrayage étant composée de fonte bainitique (ADI) conférant ainsi à l'ébauche une dureté et une résistance élevées. Selon l'invention, les surfaces formant les surfaces portantes pour connecter des tiges et les roulements d'arbre sont sous-calibrées avant le traitement thermique ADI. A la suite de ce traitement thermique, un revêtement est appliqué aux surfaces portantes, l'épaisseur de la couche correspondant aux écarts dimensionnels et au sous-calibrage résultant du traitement thermique. Les surfaces portantes enduites subissent ensuite un finissage mécanique à la taille finale sans avoir besoin d'usiner les surfaces portantes de l'ébauche de moulage après traitement thermique.
Mcfadden Fincham
Thyssenkrupp Metalurgica Campo Limpo Ltda
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