METHOD FOR PRODUCING A HOLE IN PLATE MEMBER
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United States of America Patent
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Issued Date -
Jul 19, 2012
app pub date -
Oct 3, 2008
filing date -
Oct 3, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention is premised upon a method of piercing a hole through a plate member by removing at least 10% of the hole offal material prior to piercing the hole. In the case of high strength steel plating (e.g. armor plating), the step of annealing before punching may be included, as well as the step of hardening the steel after the punching operation.
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