Title:
PLUG FOR EXPANDING END OF METAL PIPE, METHOD FOR EXPANDING PIPE USING PLUG, AND METHOD FOR MANUFACTURING METAL PIPE
Document Type and Number:
WIPO Patent Application WO/2011/016434
Kind Code:
A1
Abstract:
Provided is a plug (30) which is capable of reducing irregularities in the inner diameter at a frontmost end portion of an end of a metal pipe in the vicinity of an opening. The plug is provided with a taper portion (301) and a cylindrical portion (302) continuous therewith. The diameter of a tapered surface (301S) gradually increases from the front end of the plug toward the rear end. The tapered surface (301S) includes a contact surface portion (CS), a terminal point surface portion (ES), and a start point surface portion (OS). The contact surface portion (CS) has a diameter identical to the inside diameter of the metal pipe before the metal pipe is expanded. The contact surface portion further has a taper angle of 1.0 to 3.0°. The terminal point surface portion (ES) is located at the rear end of the tapered surface (301S) and has a diameter of D1. The start point surface portion (OS) is located between the contact surface portion (CS) and the terminal point surface portion (ES) and has a diameter of D2 = D1 x 0.99. The axial distance LR between the start point surface portion (OS) and the terminal point surface portion (ES) satisfies the expression (1). 22≤LR/((D1 – D2)/2)≤115 (1)
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Inventors:
OKUI, Tatsuya (5-33, Kitahama 4-chom, Chuo-ku Osaka-shi Osaka 41, 〒5410041, JP)
奥井 達也 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
奥井 達也 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 住友金属工業株式会社内 Osaka, 〒5410041, JP)
Application Number:
JP2010/063054
Publication Date:
February 10, 2011
Filing Date:
August 03, 2010
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-k, Osaka-shi Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 Osaka, 〒5410041, JP)
OKUI, Tatsuya (5-33, Kitahama 4-chom, Chuo-ku Osaka-shi Osaka 41, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜４丁目５番３３号 Osaka, 〒5410041, JP)
OKUI, Tatsuya (5-33, Kitahama 4-chom, Chuo-ku Osaka-shi Osaka 41, 〒5410041, JP)
International Classes:
B21D41/02
Attorney, Agent or Firm:
UEBA Hidetoshi et al. (Intelix International, Aqua Dojima West 4-16, Dojimahama 1-chome, Kita-ku, Osaka-sh, Osaka 04, 〒5300004, JP)
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