Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Patent
1985-06-20
1986-04-01
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
72 96, B21B 1904
Patent
active
045789746
ABSTRACT:
The disclosure is directed to a process and a mill installation for the production of seamless tubes of high quality, in production mills having relatively modest production requirements. The mill installation comprises a cross roll piercing mill 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, and most particularly a novel form of such Diescher type elongator incorporating a restrained mandrel bar feature. From the Diescher mill, the highly elongated tube is processed on a sizing mill for finish sizing and typically some additional elongation. Although the Diescher type elongator is a well known mill in a general sense, its use in the context of this invention is unique, as is its use in conjunction with a restrained mandrel. The new 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.
REFERENCES:
patent: 1946933 (1934-02-01), Diescher
patent: 1951348 (1934-03-01), Diescher
patent: 1996148 (1935-04-01), Diescher
patent: 2006336 (1935-07-01), Diescher
patent: 2048925 (1936-07-01), Diescher
patent: 3593553 (1971-07-01), Rodder
Seamless Tube Mills by Aetna-Standard Engineering Co.
Pozsgay Dezsoe A.
Rau Robert J.
Aetna-Standard Engineering Company
Larson Lowell A.
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