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. 11, 2000
Filed:
Dec. 16, 1998
Peter Thieven, Aachen, DE;
Mannesmann AG, Dusseldorf, DE;
Abstract
A roll pass of a roll set having three rolls for a multi-stand mandrel-free stretch reducing mill has a roll pass shape that deviates from the circular. A tube is passed in its longitudinal direction through the non-circular roll pass shape enabling modification of a shape of a cross-section of the tube, so as to counteract the non-circular external diameter deviations of the tube. A final roll pass (finishing pass) of the stretch reducing mill is locally enlarged at peripheral points where the tube diameter of the entering tube would otherwise deviate downward from a target size and locally reduced in size at the peripheral points where the tube diameter would otherwise deviate upward from the target size.