METHOD FOR PRESS PUNCHING A HOLE IN SHEET METAL AND PRESS DIE
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United States of America Patent
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app pub date -
Mar 31, 2011
filing date -
Dec 17, 2002
priority date (Note) -
Abandoned
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Abstract
A punch unit for a press die for punching a hole in sheet metal includes: a piercing punch provided with a sharp projection; a plunger for pressing the piercing punch; a cylinder for supporting the piercing punch and the plunger slidably in a punching direction; and a coil spring for retracting the piercing punch and the plunger. Also disclosed are a press die for punching a hole in sheet metal and a punching method using the punch unit.
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