Patent ID: 6279364
Filing Date: 2001-08-28
Classification: B21D,Y10T

Abstract:
A method of sealing an end of a tubular workpiece having an initial transverse cross-section, a wall thickness, an inner surface, an interior region bounded by the inner surface, and a pair of opposite ends, the method comprising the steps of;providing a sealing tool comprising a neck, and a coining portion comprising a shoulder extending outwardly from said neck;deforming one of said opposite ends to provide a deformed end portion having a deformed transverse cross-section different from said initial transverse cross-section;coining said workpiece by axially pressing said sealing tool into said deformed end portion while pressing said one opposite end laterally inwardly and thereby sealing said deformed end portion;the sealing tool comprising a base portion rearwardly of said coining portion of transverse width greater than an inner transverse width of said deformed transverse cross-section; andsaid coining step comprising engaging an end surface of said one opposite end with said coining portion while maintaining said base portion axially outwardly from said end surface of said one opposite end.