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:
Jul. 05, 2016
Filed:
Sep. 19, 2011
Rolf Kümmerling, Duisburg, DE;
Christoph Prasser, Essen, DE;
Gerd Homberg, Mettmann, DE;
Frank Hagemann, Willich, DE;
Gabriel Pereira, Oberhausen, DE;
Winfried Braun, Düsseldorf, DE;
Rolf Kümmerling, Duisburg, DE;
Christoph Prasser, Essen, DE;
Gerd Homberg, Mettmann, DE;
Frank Hagemann, Willich, DE;
Gabriel Pereira, Oberhausen, DE;
Winfried Braun, Düsseldorf, DE;
VALLOUREC DEUTSCHLAND GMBH, Düsseldorf, DE;
Abstract
In a method for producing seamless pipes, a hot hollow block created previously in a piercing mill is stretched by means of a continuous rolling mill on a mandrel bar to form a parent pipe and the parent pipe is fed directly to a stretch reducing mill or sizing mill as a finishing mill, while forgoing an extracting mill and a reheating furnace, and is rolled there to the required final pipe diameter. The hollow block is pre-dimensioned in its length in such a manner that only a single length is produced as the required parent pipe length during the stretching in the continuous rolling mill and the parent pipe is pulled off of the mandrel rod by the finishing rolling during the subsequent finishing rolling, wherein the rolling is performed using rolling mill components that are designed in the dimensions thereof for handling single lengths.