DE3426224

The mill installation comprises a cross roll piercing mill 15 for piercing and initially elongating a solid cylindrical billet. Preferably, but not in all cases, the cross roll piercer is followed by a second cross roll "piercer" which functions purely as an elongator, and which functions...

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Bibliographic Details
Main Authors RAU, ROBERT JOHN, PITTSBURGH, PA., US, POZSGAY, DEZSOE ALBERT
Format Patent
LanguageEnglish
Published 02.01.1992
Subjects
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL
PERFORMING OPERATIONS
PUNCHING METAL
ROLLING OF METAL
TRANSPORTING
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Summary:The mill installation comprises a cross roll piercing mill 15 for piercing and initially elongating a solid cylindrical billet. Preferably, but not in all cases, the cross roll piercer is followed by a second cross roll "piercer" which functions purely as an elongator, and which functions to substantially elongate the pierced billet, typically in conjunction with an increase in O.D. and reduction in wall thickness. As a key feature, the pierced billet, previously processed by either one or two cross roll piercer/elongators, is thereafter further elongated by means of a Diescher-type elongator 19 incorporating a mandrel bar restrained from moving through the mill at the velocity of the billet. From the Diescher mill, the highly elongated tube is processed on a sizing mill 21 for finish sizing and typically some additional elongation. The mill complex makes it economically feasible to install a seamless tube mill for the production of high quality tubing at production levels as low as 200,000 - 250,000 tons per year.
Bibliography:Application Number: DE19843426224