Title:
INCLINED SMALL HOLE WORKING METHOD
Document Type and Number:
WIPO Patent Application WO/2009/025250
Kind Code:
A1
Abstract:
Intended is to enable an inclined small hole working method for forming a small
hole inclined at a predetermined angle in a work made of a relatively hard material,
to achieve the shaping precision and the positioning precision of the small hole
at high levels while making the small hole deeper at a higher inclination angle.
The inclined small hole working method forms the small hole by feeding the drill
at a predetermined feeding pitch such that a drill rotating axis is aligned with
a cut-scheduled line (X) inclined at a predetermined angle with respect to the
line normal to the surface of a work (1). A guide hole (10a) having an internal
diameter of substantially the same size as that of a drill diameter (d) and holding
the drill tip portion to regulate the play of the rotating axis in the centrifugal
direction is so formed by cutting it in a substantially cylindrical shape from
the surface of the work (1) by means of an end mill (2) that the center axis may be
aligned with the cut-scheduled line (X). Next, the drill cutting step is started
by inserting the tip portion of a drill (30a) into the guide hole (10a). At the
approaching step of the boring operation, the drill cutting position/direction
is guided into alignment with the cut-scheduled line (X) by the guide hole (10a).
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Inventors:
YANAGISAWA KOUJI (JP)
SAITO YASUHIRO (JP)
YANAGISAWA TAKAJYU (JP)
KANUMA MASAHISA (JP)
FUJIKURA KIYOSHI (JP)
SAITO YASUHIRO (JP)
YANAGISAWA TAKAJYU (JP)
KANUMA MASAHISA (JP)
FUJIKURA KIYOSHI (JP)
Application Number:
PCT/JP2008/064665
Publication Date:
February 26, 2009
Filing Date:
August 11, 2008
Export Citation:
Assignee:
YANAGISAWA GIKEN CO LTD (JP)
YANAGISAWA KOUJI (JP)
SAITO YASUHIRO (JP)
YANAGISAWA TAKAJYU (JP)
KANUMA MASAHISA (JP)
FUJIKURA KIYOSHI (JP)
YANAGISAWA KOUJI (JP)
SAITO YASUHIRO (JP)
YANAGISAWA TAKAJYU (JP)
KANUMA MASAHISA (JP)
FUJIKURA KIYOSHI (JP)
International Classes:
B23B35/00; B23B41/14; B23B47/18; B23B49/00
Foreign References:
| JP2007216334A | 2007-08-30 | |||
| JPS56107862A | 1981-08-27 | |||
| JPS60201811A | 1985-10-12 | |||
| JPS52117691U | 1977-09-06 | |||
| JPH0343109A | 1991-02-25 | |||
| JPH0516023U | 1993-03-02 | |||
| JPH06198505A | 1994-07-19 | |||
| JPS61152307A | 1986-07-11 |
Attorney, Agent or Firm:
HASHIMOTO, Katsuhiko (PORARIS UENO 27-10Higashi Ueno 4-Chome, Taito-K, Tokyo 15, JP)
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