SUBSURFACE CHILLS TO IMPROVE RAILCAR KNUCKLE FORMATION

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 red...

Full description

Saved in:
Bibliographic Details
Main Authors BROOKS NOLAND, SMERECKY JERRY R, SALAMASICK NICK, NIBOUAR F. ANDREW
Format Patent
LanguageEnglish
Published 21.07.2016
Subjects
CASTING
CASTING OF METALS
CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
COUPLINGS
DRAUGHT AND BUFFING APPLIANCES
FOUNDRY MOULDING
PERFORMING OPERATIONS
POWDER METALLURGY
RAILWAYS
TRANSPORTING
Online AccessGet full text

Cover

More Information
Summary: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.
Bibliography:Application Number: US201615057855