Title:
DEEP-HOLE-BORING DRILL HEAD AND GUIDE PAD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2011/142370
Kind Code:
A1
Abstract:
In order to increase the durability of a deep-hole drill head, wherein a cutting blade and a guide pad are brazed to a head body, and to cause spiral marks to not arise even after long-term use, disclosed is a deep-hole-boring drill head (1)—which is provided with a head body (3), a cutting blade (11), a first guide pad (21), and a second guide pad (23)—wherein a flat land is provided to the peripheral edge (16) of the end of the cutting blade (11), a first moving radius (a) from the rotational center (P) of the head body (3) to the peripheral edge (16) of the end of the cutting blade (11) and a third moving radius (c) from said rotational center (P) to the primary guide surface (24) of the second guide pad (23) are equivalent, and a second moving radius (d) from the rotational center (P) of the head body (3) to the primary guide surface (22) of the first guide pad (21) is smaller than the first moving radius (a). The guide pads are, in the primary guide surfaces thereof, provided with a first region having a first radius that is the same length as the radius of the inner peripheral surface of the hole, and a second region having a moving radius that is smaller than said first radius, and the first region is wide in the direction towards the back end from the leading edge of the primary guide surface.
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Inventors:
TSUKAMOTO KEIZO (JP)
FUJII KATSUSHI (JP)
FUJII KATSUSHI (JP)
Application Number:
PCT/JP2011/060789
Publication Date:
November 17, 2011
Filing Date:
May 10, 2011
Export Citation:
Assignee:
AYABO CORP (JP)
TSUKAMOTO KEIZO (JP)
FUJII KATSUSHI (JP)
TSUKAMOTO KEIZO (JP)
FUJII KATSUSHI (JP)
International Classes:
B23B51/06; B23B51/00
Foreign References:
| JP2005103701A | 2005-04-21 | |||
| US5921727A | 1999-07-13 | |||
| US5551812A | 1996-09-03 | |||
| JP2006334749A | 2006-12-14 | |||
| JP2006239826A | 2006-09-14 | |||
| JP2008254091A | 2008-10-23 | |||
| JP2006239827A | 2006-09-14 | |||
| JP2010155303A | 2010-07-15 |
Other References:
See also references of EP 2570214A4
Attorney, Agent or Firm:
KONISHI, Tomimasa (JP)
Konishi Tomu -- elegant (JP)
Konishi Tomu -- elegant (JP)
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Claims: