SLUG FLOAT-UP PREVENTING METHOD AND PUNCH TOOL
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United States of America Patent
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Issued Date -
Aug 12, 2010
app pub date -
May 20, 2008
filing date -
May 22, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Provided are a slug float-up preventing method and a punch tool in performing a punching process on a plate-shaped workpiece (W) by cooperation between a punch tool (1) and a die tool (25), in which the workpiece is pressed onto an upper surface of the die tool by use of a plate holder (7) provided on the punch tool, part of the workpiece is punched out into a die hole (27) in the die tool by use of a punch blade (13) provided on the punch tool, a large amount of fluid is blown from a portion of a hole already processed on the workpiece toward a lower side of the punch blade (13) when the punch blade (13) is being lifted and is located above a lower surface of the workpiece and below an upper surface of the workpiece, and a small piece of slug located below the punch blade is dropped into the die hole (27).
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