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:
May. 10, 2011
Filed:
Sep. 28, 2007
Hiroyuki Iwamoto, Sanda, JP;
Hiroyuki Iwamoto, Sanda, JP;
Sumitomo Metal Industries, Ltd., Osaka, JP;
Abstract
An elongation rolling control method is provided which can manufacture a hollow shell of high dimensional accuracy and can suppress rolling problems. It is an elongation rolling control method in which the groove bottom wall thickness of a hollow shell P in stand #having an ultrasonic wall thickness wall gaugeinstalled between it and stand #is measured, the outer diameter of a mandrel bar B is calculated based on the set value of the roll gap in stand #and the groove bottom wall thickness of the hollow shell P, the location in the lengthwise direction of the mandrel bar B for which the outer diameter was calculated is determined based on positional information on a bar retainer BR, the distribution in the lengthwise direction of the outer diameter of the mandrel bar is calculated by repeating the above steps, the location in the lengthwise direction of the mandrel bar which contacts the hollow shell in a subsequent stand is determined based on positional information on the bar retainer, and the roll gap in the subsequent stand is set based on the outer diameter of the determined location in the lengthwise direction of the mandrel bar.