New Control Technique For Reducing The Likelihood Of Cobbles In The Tandem Rolling Of Hot Metal Sheet

Keywords

Metals industry; Nonlinear systems; Optimal control; Process control; Riccati equations

Abstract

An extremely difficult challenge is the control of the tandem rolling of hot metal sheet. This is a highly complex nonlinear process whose characteristics change considerably during normal operating conditions and with various product mixes. Additionally, the hostile hot metal rolling environment further exacerbates this challenge as it precludes the location of certain sensors to measure variables that are important for control. In our previous work we have developed a new controller for the tandem hot and cold metal rolling processes based on a newly emerging method for control of nonlinear systems'2. As shown previously, the results have been highly successful for control of both hot and cold tandem metal rolling during normal operation, and in mitigating the effects of disturbances and uncertainties that would be typically encountered in both normal and abnormal situations. In this paper we present the results of our farther investigation into the capability of the controller to reduce the likelihood of cobbles caused by changes in the phase of the workpiece material in the hot metal rolling process, where such changes are induced by temperature excursions, such as those caused by skid chill in the reheat furnace. Our results have been quite successful, as simulations have shown that changes in mass flow are considerably reduced with a corresponding reduction in the likelihood of a cobble.

Publication Date

1-1-2015

Publication Title

AISTech - Iron and Steel Technology Conference Proceedings

Volume

2

Number of Pages

2647-2660

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

84940421668 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84940421668

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