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Patent Searching and Data


Title:
MANUFACTURE OF METALLIC TUBE HAVING INSIDE SPIRAL GROOVE
Document Type and Number:
Japanese Patent JPH02160111
Kind Code:
A
Abstract:

PURPOSE: To manufacture a tube having an inside spiral groove high in dimensional accuracy by using a skew rolling mill having a plug provided with a spiral groove, carrying out skew hot rolling of a metallic tube stock, removing the oxide and carrying out skew cold rolling again.

CONSTITUTION: Suitable skew angles to rollers 1, 2, 3 and crossed axis angles between them are set respectively and while they are rotated and driven in the same direction, heated metallic tube stocks 7 are supplied, bit into the rollers 1, 2, 3 and at the same time a plug 4 is inserted into a core hole 7a. The metallic tube stock 7 is charged by the pressure of the rollers 1, 2, 3 in the spiral groove 4a to make a metallic tube stock 8 having an inside spiral groove. After the bend of this stock is straightened by a straightening machine and the metallic oxide is removed by pickling and shot peening, a skew cold rolling finish is performed again. The inside spiral grooved metallic tube having a spiral groove high in dimensional accuracy and good in shape can be manufac tured efficiently.


Inventors:
KURODA KOICHI
Application Number:
JP31268388A
Publication Date:
June 20, 1990
Filing Date:
December 09, 1988
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
B21C1/22; B21B19/02; B21B19/06; B21B23/00; B21B25/00; B21C3/08; B21C3/18; (IPC1-7): B21B19/06; B21B23/00; B21C1/22; B21C3/08; B21C3/18
Attorney, Agent or Firm:
Tono Kono