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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).

Inventors:
UENO EIZOU (JP)
Application Number:
PCT/JP2007/057075
Publication Date:
October 18, 2007
Filing Date:
March 30, 2007
Export Citation:
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Assignee:
UENO EIZOU (JP)
International Classes:
B21D28/28; B21D28/00
Foreign References:
JPS5150684U1976-04-17
JPS5363689A1978-06-07
JP2002361338A2002-12-17
JP2004122172A2004-04-22
JPS5662626A1981-05-28
JPH0513623U1993-02-23
JPS6363537A1988-03-19
JPS6182727U1986-05-31
JP2001353535A2001-12-25
JP2002083558A2002-03-22
JPH05337566A1993-12-21
JPH0924427A1997-01-28
JPH0655376A1994-03-01
JPS59110130U1984-07-25
Attorney, Agent or Firm:
KOBAYASHI, Tsunenori (Oaza Nakano Nakano-sh, Nagano 13, JP)
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