Title:
UNEVEN WALL PREVENTING METHOD FOR PRESSURE WELDED STEEL TUBE
Document Type and Number:
Japanese Patent JPH1177146
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an uneven thickness preventing method for a pressure welded steel tube wherein a device is simply constituted, a maintenance load is small, moreover the only seam part is forcedly cooled and the generation of an uneven thickness in stretch reducing is prevented. SOLUTION: An external form of the pressure welded steel tube 10 is shaped into a nearly elliptic shape or a nearly polygonal shape with a shaping roll 12 before the seam part 15 is forcedly cooled (seam cooling), and seam cooling is executed with a restraining roll 13 having a profile suitable to this shape while restraining the movement in the circumferential direction. Rotating resistance against a twisting external force of a tube body within a seam cooling device 11 becomes remarkably large compared with conventional one in a nearly circular shape, whereby the seam part 15 is never twisted and always allowed to pass through a route touched by coolant.
Inventors:
TANAKA NOBUKI
KAGAWA MASAHIRO
SUGIE YOSHINORI
ONISHI TOSHIO
SUGANO KOJI
SHOJI MASAAKI
KAGAWA MASAHIRO
SUGIE YOSHINORI
ONISHI TOSHIO
SUGANO KOJI
SHOJI MASAAKI
Application Number:
JP24524597A
Publication Date:
March 23, 1999
Filing Date:
September 10, 1997
Export Citation:
Assignee:
KAWASAKI STEEL CO
International Classes:
B21C37/06; B23K20/00; C21D8/10; (IPC1-7): B21C37/06; B23K20/00; C21D8/10
Attorney, Agent or Firm:
Eiichi Kobayashi
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