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Title:
SPIRAL TAP AND METHOD FOR MANUFACTURING THE SAME
Document Type and Number:
WIPO Patent Application WO/2010/103611
Kind Code:
A1
Abstract:
Since the core diameters (d1, d2) of a spiral flute (20) are differentiated across a level difference portion (30), which is arranged at the rear end of a lead chamfer part (22) of a thread part (16) or on the side closer to the shank (12) than the rear end, and the core diameter (d2) on the side closer to the distal end of a tap than the level difference part (30) is smaller than the core diameter (d1) on the side closer to the shank (12) than the level difference part (30), when chips produced by the cutting edges of the lead chamfer part (22) move through the spiral flute (20) to the shank (12) side and reach the level difference part (30), the chips are displaced by the level difference part (30) in the direction receding from the flute bottom and discharged well from the spiral flute (20) to the outside. This prevents that a plurality of chips corresponding to the number (n) of threads at the lead chamfer part get tangled into a ball shape in the same spiral flute (20) and a tool or a work is damaged due to the jamming or biting of chips, or that a part of the chips hooked, in the shape of a ball, to the spiral flute (20) extends therefrom and tangled with the shank (12).

Inventors:
NAKAJIMA, Takayuki (149 Miyamae Ichinomiya-cho, Toyokawa-sh, Aichi 31, 44112, JP)
中嶋 孝之 (〒31 愛知県豊川市一宮町宮前149 オーエスジー株式会社内 Aichi, 44112, JP)
Application Number:
JP2009/054474
Publication Date:
September 16, 2010
Filing Date:
March 09, 2009
Export Citation:
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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)
NAKAJIMA, Takayuki (149 Miyamae Ichinomiya-cho, Toyokawa-sh, Aichi 31, 44112, JP)
International Classes:
B23G5/06
Foreign References:
JP2008272856A
JPH10146721A
JPS6225114U
JPH0657524U
Attorney, Agent or Firm:
IKEDA, Haruyuki (Ikeda Patent Office, Nagoya-Dia. Bldg. No.2 15-1 Meieki 3-chome, Nakamura-ku, Nagoya-sh, Aichi 02, 45000, JP)
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