Title:
METHOD FOR PRODUCING SEAMLESS PIPE
Document Type and Number:
WIPO Patent Application WO/2010/093000
Kind Code:
A1
Abstract:
Provided is a method for producing a seamless pipe with which transectional cracking at the outer surface of the pipe top part when hot extrusion is performed using a material to be extruded having a low deformability at a high temperature can be prevented by heating the material to be extruded to a temperature T [°C] that satisfies the correlation in formula (1) or (2) in accordance with the outer diameter d０[mm] thereof and then performing hot extrusion with a solid lubricated glass interposed between the material and the die. When d０＜200, T≦1250＋1.1487×A－7.838×ln(t０／t)－10.135×ln(d０／d)…(1); when d０≧200, T≦1219＋1.1487×A－7.838×ln(t０／t)－10.135×ln(d０／d)…(2); A＝L／Vａｖ×1000[msec]; Vａｖ＝（V０＋V０×ρ）／2[mm／sec]; ρ＝(t０×(d０－t０))／(t×(d－t)); t0: thickness of the material to be extruded [mm]; d: outer diameter of extruded pipe [mm]; t: thickness of extruded pipe [mm]; L: length in direction of extrusion of part that approaches the die [mm]; and V0: ram speed [mm/sec].
More Like This:
| JP57031407 | EXTRUDING METHOD THROUGH MULTIHOLED DIE |
| WO/1999/022886 | METHOD FOR PRODUCING HOLLOW NICKEL TITANIUM PROFILES |
| JP2001025814 | MANUFACTURE OF BRASS WIRE FOR COLD HEADING |
Inventors:
HARADA Kouichi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
原田 浩一 (〒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)
原田 浩一 (〒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)
Application Number:
JP2010/052015
Publication Date:
August 19, 2010
Filing Date:
February 12, 2010
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)
HARADA Kouichi (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)
HARADA Kouichi (5-33, Kitahama 4-chome, Chuo-ku, Osaka-sh, Osaka 41, 〒5410041, JP)
International Classes:
B21C23/08; C22C38/00; C22C38/58
Attorney, Agent or Firm:
MORI Michio et al. (M. MORI PATENT OFFICE, 17-23 Higashinaniwa-cho 5-chome, Amagasaki-sh, Hyogo 92, 〒6600892, JP)
Download PDF: