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Patent Searching and Data


Title:
THREAD FORMING TAP
Document Type and Number:
WIPO Patent Application WO/2011/004455
Kind Code:
A1
Abstract:
Disclosed is a thread forming tap wherein frictional torque or heat generation is reduced because the margin section is substantially 0 in connection with a shape near the top of a protrusion (δ=0°) to thereby decrease a contact area with a workpiece at the time of thread forming.  In a rough plastic deformation section separated from the top of a protrusion (δ=0°), the protrusion has an Archimedes curve shape where the amount of relief (R) changes linearly, while, in a finish plastic deformation section near the top, the shape of the protrusion is changed according to a quadratic curve.  Since variations in the amount of relief (R) decreases near the top where the a processing load is large, thread forming is carried out smoothly and thereby frictional torque or heat generation is reduced without sacrificing the durability of the protrusion.  Since frictional torque or heat generation is reduced without sacrificing the durability of the protrusion due to the reduction of margin and the special shape of the protrusion, the occurrence of welding or abrasion of or damage to the protrusion is minimized even when tapping is carried out under conditions susceptible to welding, e.g. high-speed processing, and thereby the lifetime of a tool is prolonged.

Inventors:
NORIMATSU Kentaroh (149 Miyamae, Ichinomiya-cho, Toyokawa-sh, Aichi 31, 〒4411231, JP)
乗松 顕太朗 (〒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, 〒4411231, JP)
MATSUSHITA Takayuki (149 Miyamae, Ichinomiya-cho, Toyokawa-sh, Aichi 31, 〒4411231, JP)
Application Number:
JP2009/062360
Publication Date:
January 13, 2011
Filing Date:
July 07, 2009
Export Citation:
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Assignee:
OSG CORPORATION (22 Honnogahara 3-chome, Toyokawa-shi Aichi, 05, 〒4420005, 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, 〒4420005, JP)
NORIMATSU Kentaroh (149 Miyamae, Ichinomiya-cho, Toyokawa-sh, Aichi 31, 〒4411231, JP)
乗松 顕太朗 (〒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, 〒4411231, JP)
International Classes:
B23G5/06
Foreign References:
JP2004276085A
JP2004148430A
JPS3524741Y1
JP2006239858A
JPS624556A
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, 〒4500002, JP)
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