Necking die with redraw surface and method of die necking
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United States of America Patent
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Issued Date -
May 6, 2010
app pub date -
Oct 30, 2009
filing date -
Oct 31, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention provides a die set comprising an annular necking die and a knockout punch for necking-in a metal container, and a method of necking. In the method, in at least one necking-in step, the metal container is both reduced in diameter and the container wall is redrawn to minimize circumferential irregularities of wall thickness and/or circumferential rippling of the container wall caused by the reduction of diameter. The die of the die set is provided with a redraw surface to achieve this redrawing effect.
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