Methods of necking-in and flanging tubular can bodies
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United States of America Patent
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-
May 8, 1984
Grant Date -
N/A
app pub date -
Feb 8, 1982
filing date -
Feb 8, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Methods of necking-in and flanging tubular can bodies having body walls of constant thickness. A pilot die initially inserted into the tubular can body reverses its direction during the necking-in operation with respect to the motion of a ring die member that contacts the exterior surface of the tubular can body member. This concurrent reverse movement of the two forming dies eliminates wrinkles in the necked-in region and produces a container body with increased columnar strength. Repetitive use of the method produces containers with two or three necked-in portions. A method is also disclosed for relubricating the necked-in area of the tubular can body between the successive necking stations.
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