Methods and apparatus for manufacturing seamless tube

Details Methods and apparatus for manufacturing seamless tube Methods and apparatus for manufacturing seamless tube

1987-12-23

1990-05-29

Spruill, Robert L.

Metal deforming

With exposure of work to gas, vapor, mist, or modified...

72 96, 72 97, 72358, B21B 900, B21B 1904, B21B 1910

Patent

active

049285076

ABSTRACT:
Ingots hot from rolling are pierced to form a hollow ingot by means of an internal tool of a press or skew-rolling line, and are subsequently elongated to form a tubular bloom by a stretching unit provided with a mandrel rod, and are finally finish-rolled. When inserting or withdrawing the internal tool into or out of the hollow ingot or the mandrel rod into or out of the tubular bloom, inert gas is introduced into the freed interior space in order to prevent scaling of the interior wall of the tubular bloom.

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