Title:
DRILL
Document Type and Number:
WIPO Patent Application WO/2010/055559
Kind Code:
A1
Abstract:
A drill of high machining precision obtained by preventing the problem of a composite material including a hard-to-cut material such as CFRP, i.e. curling of the surface layer and generation of whisker burr (Q) in the backside layer. In a drill having a spiral lead flute (3) of predetermined lead angle β formed in the outer circumferential surface of the drill body (1), and a cutting edge (5) formed on the tip end face at a point angle α, point lead portions (3a) having a point lead angle βa of the spiral lead flute set at a fixed value in the range of -10° to +10° smaller than the lead angle β are formed at the tip head portions (10, 20) of the drill body, an outer circumferential edge portion (5a) of sharp edge profile is formed in the cutting edge (5) by setting an outer circumferential rake angle θ and the cutting edge (5) is made to have a concave curve ridge line.
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Inventors:
KAKIMOTO, Masakazu (Daiyon-toyosato biru 1F 1-410 Nakahira, Tenpaku-ku, Nagoya-sh, Aichi 14, 46800, JP)
柿本 政計 (〒14 愛知県名古屋市天白区中平１‐４１０ 第四豊郷ビル１Ｆ ＮＥＸＴ Ｉ＆Ｄ株式会社内 Aichi, 46800, JP)
DEGUCHI, Takeshi (Daiyon-toyosato biru 1F 1-410 Nakahira, Tenpaku-ku, Nagoya-sh, Aichi 14, 46800, JP)
柿本 政計 (〒14 愛知県名古屋市天白区中平１‐４１０ 第四豊郷ビル１Ｆ ＮＥＸＴ Ｉ＆Ｄ株式会社内 Aichi, 46800, JP)
DEGUCHI, Takeshi (Daiyon-toyosato biru 1F 1-410 Nakahira, Tenpaku-ku, Nagoya-sh, Aichi 14, 46800, JP)
Application Number:
JP2008/070603
Publication Date:
May 20, 2010
Filing Date:
November 12, 2008
Export Citation:
Assignee:
NEXT I&D CORPORATION (2702, Kamisawa 1-chome Midori-ku, Nagoya-sh, Aichi 14, 45800, JP)
ＮＥＸＴ Ｉ＆Ｄ株式会社 (〒14 愛知県名古屋市緑区神沢一丁目２７０２番地 Aichi, 45800, JP)
BTT CORPORATION (801 Hanasakidai 2-chome, Moriyama-ku Nagoya-shi Aichi, 08, 46308, JP)
ビーティーティー株式会社 (〒08 愛知県名古屋市守山区花咲台二丁目８０１番地 Aichi, 46308, JP)
KAKIMOTO, Masakazu (Daiyon-toyosato biru 1F 1-410 Nakahira, Tenpaku-ku, Nagoya-sh, Aichi 14, 46800, JP)
ＮＥＸＴ Ｉ＆Ｄ株式会社 (〒14 愛知県名古屋市緑区神沢一丁目２７０２番地 Aichi, 45800, JP)
BTT CORPORATION (801 Hanasakidai 2-chome, Moriyama-ku Nagoya-shi Aichi, 08, 46308, JP)
ビーティーティー株式会社 (〒08 愛知県名古屋市守山区花咲台二丁目８０１番地 Aichi, 46308, JP)
KAKIMOTO, Masakazu (Daiyon-toyosato biru 1F 1-410 Nakahira, Tenpaku-ku, Nagoya-sh, Aichi 14, 46800, JP)
International Classes:
B23B51/02
Attorney, Agent or Firm:
EICHI Patent & Trademark Corp. (45-13, Sengoku 4-chomeBunkyo-k, Tokyo 11, 11200, JP)
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