Title:
METHOD OF DRILLING THROUGH HOLE IN WORK PERIPHERAL WALL AND DRILLING DEVICE
Document Type and Number:
WIPO Patent Application WO/2007/116820
Kind Code:
A1
Abstract:
A method of drilling a through hole in the peripheral wall of a work and a drilling
device which can prevent burrs from occurring on the inner peripheral surface
of a tubular unit, are high in productivity, and can significantly reduce processing
cost. The drilling device comprises one (20) of dies for processing a work (10),
a feeder means (81) for sucking the work (10) and feeding it to the die (20) while
holding it so as to be able to slide in a punching direction, a punch (30) protruding
shorter than the thickness of the peripheral wall from a rod-like cored bar (32)
held in a cantilever form so as to be inserted into the inside of a tubular unit,
a pressurizing means (50) for relatively pressure-moving the punch (30) via
the cored bar (32) in a direction of approaching the die (20) to thereby drive the
punch (30) into the peripheral wall from the inside of the tubular unit, cause
shearing and breaking, and drill a through hole (70).
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Inventors:
UENO EIZOU (JP)
Application Number:
PCT/JP2007/057075
Publication Date:
October 18, 2007
Filing Date:
March 30, 2007
Export Citation:
Assignee:
UENO EIZOU (JP)
International Classes:
B21D28/28; B21D28/00
Foreign References:
JPS5150684U | 1976-04-17 | |||
JPS5363689A | 1978-06-07 | |||
JP2002361338A | 2002-12-17 | |||
JP2004122172A | 2004-04-22 | |||
JPS5662626A | 1981-05-28 | |||
JPH0513623U | 1993-02-23 | |||
JPS6363537A | 1988-03-19 | |||
JPS6182727U | 1986-05-31 | |||
JP2001353535A | 2001-12-25 | |||
JP2002083558A | 2002-03-22 | |||
JPH05337566A | 1993-12-21 | |||
JPH0924427A | 1997-01-28 | |||
JPH0655376A | 1994-03-01 | |||
JPS59110130U | 1984-07-25 |
Attorney, Agent or Firm:
KOBAYASHI, Tsunenori (Oaza Nakano Nakano-sh, Nagano 13, JP)
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