The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1976
Filed:
Jan. 08, 1975
Applicant:
Inventors:
Erhard Hentzschel, Aachen, DT;
Heinz Schumacher, Ratingen, DT;
Assignee:
Mannesmannrohren-Werke AG, Dusseldorf, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21B / ;
U.S. Cl.
CPC ...
72 21 ; 72189 ; 72252 ;
Abstract
The feed mechanism for a pilger or Mannesmann rolling mill is driven by an electrical linear motor which is controlled on the basis of two pulse trains. One train is derived from the rolls, the other one from the reciprocating motor. The control is carried out to distinguish between a constant speed phase during a rolling pass, an acceleration phase for advancing the feed mechanism and a deceleration phase to obtain reversal ahead of re-engagement of the bloom by the rolls for the next rolling step.