Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1996-12-04
1998-03-10
Moon, Daniel
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72348, 413 69, B21D 2200, B21D 2221
Patent
active
057248486
ABSTRACT:
An improved system and process of necking an upper end of a metallic container that will reduce the incidence of defects such as wrinkles and puckers during the necking process includes steps of performing a first stage operation to reduce a radius of said upper end by a first distance, and incrementally further reducing the radius of the upper end by performing a plurality of subsequent reduction operations on the upper end. Advantageously, step (b) is performed so that the amount of radius reduction that is applied by earlier of the subsequent reduction operations is less than the amount of radius reduction that is applied by later of the subsequent reduction operations. As a result, increases of wall thickness that occur during the subsequent reduction operations will be utilized to permit greater radial reduction in the later steps, and will ease the amount of radial reduction in the earlier steps, reducing the potential for defects such as puckering and wrinkling.
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Butler Rodney
Crown Cork & Seal Company, Inc.
Moon Daniel
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