METHOD OF MAKING WEAKENING LINES IN SHEET METAL

A new sequence of steps provides more control in the formation in sheet metal of weakening lines of the type characterized by an integral yet fractured section. Basically, the method employs, in making so-called easyopen can ends, for example:1) peripherally forming a closure in the sheet metal;2) c...

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Bibliographic Details
Main Author KELLEY, JOHN S
Format Patent
LanguageEnglish
French
Published 12.02.1980
Subjects
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL
PERFORMING OPERATIONS
PUNCHING METAL
TRANSPORTING
WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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Summary:A new sequence of steps provides more control in the formation in sheet metal of weakening lines of the type characterized by an integral yet fractured section. Basically, the method employs, in making so-called easyopen can ends, for example:1) peripherally forming a closure in the sheet metal;2) coining or scoring a profile surface of the closure, not to the depth required for fracture, but to establish residuum thickness along the desired line;3) next, overforming the closure at least in part to integrally fracture the residuum along that coined line; and4) lastly, swaging to seal or tighten edges of the fractured section.
Bibliography:Application Number: CA19770273951