Cold-formed tank head for railroad tank car

A new method of manufacturing a railroad car tank head having the steps of providing a circular blank of steel plate material, cold-forming the circular blank to form an intermediate ellipsoidal dish, cold-forming a peripheral flange region of the intermediate ellipsoidal dish to form a flanged elli...

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Bibliographische Detailangaben
Hauptverfasser:	Assaad Emad Fakhry Habib, Balaz Richard M, Stancescu Daniel P
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR BODY DETAILS OR KINDS OF RAILWAY VEHICLES CHEMISTRY CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS CONVEYING GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS HANDLING THIN OR FILAMENTARY MATERIAL MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PACKAGES PACKAGING ELEMENTS PACKING PERFORMING OPERATIONS PUNCHING METAL RAILWAYS STORING TRANSPORTING WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Beschreibung
Zusammenfassung:	A new method of manufacturing a railroad car tank head having the steps of providing a circular blank of steel plate material, cold-forming the circular blank to form an intermediate ellipsoidal dish, cold-forming a peripheral flange region of the intermediate ellipsoidal dish to form a flanged ellipsoidal dish, and heat treating the flanged ellipsoidal dish. The heat treatment may be either a thermal stress relieving heat treatment or a normalizing heat treatment. The two cold-forming steps may be carried out at room temperature. The present invention provides a method of making a railroad car tank head that is more efficient than prior methods, avoids the challenges of hot-forming and single-stage cold-forming, is easily adaptable to different tank head diameters using the same forming equipment, and yields a railroad car tank head that meets safety standards.