Method and tool for forming a tapered hole in a cylindrical work by punching extruding
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United States of America Patent
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Oct 6, 1998
Grant Date -
N/A
app pub date -
Jun 25, 1997
filing date -
Sep 29, 1994
priority date (Note) -
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status (Latency Note)
Importance
Abstract
This invention provides a forming method capable of forming tapered through holes at once with a single pressing operation. A hole is formed in a work with a piercing punch 1 mounted on a press by using a small-diameter punching portion 1a formed on the distal end of the punch 1. A hole 11 formed at this time has a section with an open lower end portion by pressing. By using this hole 11 as a guide, a tapering portion 1b having a diameter slightly larger than the diameter of this hole and a tapered surface T forms a tapered surface on the inner surface of the hole 11 in accordance with plastic working. A 'burr 3a' is formed on the edge of the hole 11 by this plastic working. Formation of this 'burr 3a' is prevented with a pressure portion 1c formed on the piercing punch 1. When the above process is performed in a single pressing operation, a plurality of tapered through holes can be formed easily.
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