Cupper draw pad
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United States of America Patent
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Oct 20, 2020
Grant Date -
Feb 23, 2017
app pub date -
Aug 19, 2016
filing date -
Aug 20, 2015
priority date (Note) -
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status (Latency Note)
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Abstract
A draw pad reduces instances and the extent of earing when a blank of metal is clamped and punched during a drawing process that results in the formation a cup-shaped body from the blank. A draw pad for a cupping press includes an inner surface that defines a draw aperture that is configured to receive a punch. The draw pad also includes a clamping surface that has a first force concentrating segment disposed circumferentially spaced apart from a second force concentrating segment, where each force concentrating segment includes a first arcuate groove and a second arcuate groove that is disposed concentric and radially spaced apart from the first arcuate groove.
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