A method for manufacturing a railcar coupler knuckle includes, before casting, positioning an external chill within a cope mold portion and a drag mold portion offset from and adjacent internal walls of a pulling face and a throat of the cope and drag mold portions, thus producing a casting with reduced micro-shrinkage in at least the throat, a high-stress section of the casting. Use of subsurface chills produces an improved surface with fewer inclusions when compared to an equivalent surface produced in a process without use of a subsurface chill. The external chill may be a cone chill of a larger size to improve cooling and solidification at and below the surface. The external chill may also be a cylindrical and/or oblong chill with a tapered design that may correspond to the internal walls of the cope and drag mold portions between the pulling face and the throat.


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    Titel :

    Subsurface chills to improve railcar knuckle formation


    Beteiligte:
    SMERECKY JERRY R (Autor:in) / NIBOUAR F ANDREW (Autor:in) / BROOKS NOLAND (Autor:in) / SALAMASICK NICK (Autor:in)

    Erscheinungsdatum :

    2016-04-12


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Englisch


    Klassifikation :

    IPC:    B22C FOUNDRY MOULDING , Gießformen / B22D CASTING OF METALS , Gießen von Metallen / B61G Kupplungen besonders ausgebildet für Eisenbahnfahrzeuge , COUPLINGS SPECIALLY ADAPTED FOR RAILWAY VEHICLES



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