Title:
STRAIGHTENING ROLL AND METHOD FOR STRAIGHTENING PIPES
Document Type and Number:
WIPO Patent Application WO/2011/121944
Kind Code:
A1
Abstract:
Disclosed is a method for straightening a pipe by using, as a straightening roll for a straightener, an asymmetric roll with right and left roll shoulder portions which have different maximum roll diameters of D1 (exit side) and D2 (inlet side) and by positioning the roll shoulder portion of the smaller roll diameter on the pipe inlet side. The straightening roll for this method includes the roll shoulder portions (3a, 3b) and a roll barrel portion (4), satisfying that D1 > D2 and 0.004 ≤ (D1-D2)/d ≤ 0.2, where d is the outer diameter of a pipe to be straightened. It is possible to specify the radius of curvature of the inlet and exit side shoulder portions or the curve defining the outer surface of the roll barrel portion in a cross section of the roll taken along a plane passing through the axial center of the roll. This roll can prevent the deformation of the mouth of a pipe end that may occur during straightening of the pipe, thus providing enhanced straightening effects.
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Inventors:
KUROIWA, Yoshiyuki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
黒岩 良之 (〒41 大阪府大阪市中央区北浜四丁目５番３３号住友金属工業株式会社内 Osaka, 〒5410041, JP)
KURODA, Kouichi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
黒岩 良之 (〒41 大阪府大阪市中央区北浜四丁目５番３３号住友金属工業株式会社内 Osaka, 〒5410041, JP)
KURODA, Kouichi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
Application Number:
JP2011/001719
Publication Date:
October 06, 2011
Filing Date:
March 24, 2011
Export Citation:
Assignee:
SUMITOMO METAL INDUSTRIES, LTD. (5-33, Kitahama 4-chome Chuo-ku, Osaka-sh, 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四丁目５番３３号 Osaka, 〒5410041, JP)
KUROIWA, Yoshiyuki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
黒岩 良之 (〒41 大阪府大阪市中央区北浜四丁目５番３３号住友金属工業株式会社内 Osaka, 〒5410041, JP)
住友金属工業株式会社 (〒41 大阪府大阪市中央区北浜四丁目５番３３号 Osaka, 〒5410041, JP)
KUROIWA, Yoshiyuki (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
黒岩 良之 (〒41 大阪府大阪市中央区北浜四丁目５番３３号住友金属工業株式会社内 Osaka, 〒5410041, JP)
International Classes:
B21D3/02
Attorney, Agent or Firm:
MORI, Michio et al. (M. MORI PATENT OFFICE, 17-23, Higashinaniwa-cho 5-chome,, Amagasaki-sh, Hyogo 92, 〒6600892, JP)
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