Title:
DOUBLE ANGLE DRILL
Document Type and Number:
WIPO Patent Application WO/2010/086988
Kind Code:
A1
Abstract:
Disclosed is a double angle drill (10) having a double angle point, wherein the radial rake γ of a leading edge (28) is in the range of 18°-38° and is sufficiently large as compared with the radial rake in a conventional drill (normally, 10° or less), therefore finish processing from burnishing to cutting is performed by the leading edge (28) and poor accuracy of hole diameter is limited regardless of wear of a second cutting edge (18b). Since the rake angle of the second cutting edge (18b) becomes large because the radial rake γ of the leading edge (28) is made large, cutting performance of the second cutting edge (18b) is enhanced and an excellent quality of the processed hole can be attained. Consequently, an excellent quality of the processed hole is attained even in case of drilling a hole in a hard-to-cut material such as FRP, and the lifetime of a tool is enhanced.
Inventors:
TAKIKAWA, Yoshihiro (149 Miyamae Ichinomiya-cho, Toyokawa-sh, Aichi 31, 44112, JP)
Application Number:
JP2009/051509
Publication Date:
August 05, 2010
Filing Date:
January 29, 2009
Export Citation:
Assignee:
OSG CORPORATION (22 Honnogahara 3-chome, Toyokawa-shi Aichi, 05, 44200, JP)
オーエスジー株式会社 (〒05 愛知県豊川市本野ヶ原三丁目２２番地 Aichi, 44200, JP)
オーエスジー株式会社 (〒05 愛知県豊川市本野ヶ原三丁目２２番地 Aichi, 44200, JP)
International Classes:
B23B51/00
Attorney, Agent or Firm:
IKEDA, Haruyuki (Ikeda Patent Office, Nagoya-Dia. Bldg. No.215-1 Meieki 3-chome, Nakamura-k, Nagoya-shi Aichi 02, 45000, JP)
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