Method of manufacturing seamless metal pipes and tubes

Details Method of manufacturing seamless metal pipes and tubes Method of manufacturing seamless metal pipes and tubes

1979-12-19

1982-03-09

Godici, Nicholas P.

Metal deforming

Process

Tube making or reshaping

72 97, 72209, B21B 1706

Patent

active

043182941

ABSTRACT:
A solid square cross-section bloom or billet is pierced to form a hollow cylindrical piece with a closed end, using a combination of a mandrel carrying a plug or piercing point at its leading end and a set of rolls. The closed-end cylindrical workpiece and the piercing mandrel together, at the completion of piercing, are fed into a rotary elongating mill, with the closed end of the workpiece foremost. Rotary elongation is performed on the workpiece while pushing the mandrel until the plug has at least passed the point at which the closed end of the workpiece clears the delivery end of the elongation rolls.

REFERENCES:
patent: 2044358 (1936-06-01), Korbuly
patent: 2209968 (1940-08-01), Gould
patent: 3462987 (1969-08-01), Westin
patent: 3552170 (1971-01-01), Pfeiffer

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