Document Type

Patent

Abstract

A system for controlling axial shifting of working rolls on a rolling mill is provided, and more particularly, a control system method which includes monitoring sensors for the rolling mill, processing information and calculating the non-all statical friction condition for the contact surfaces of the rolls on a central processing unit, and implementing the axial shifting of the working rolls on a hydraulic system. The purposes of roll shifting are primarily to control the strip shape and crown by improving the bending roll effect, to reduce the edge drop of the strip, and to maintain the uniform wear and thermal crown of the working rolls. In order to minimize or eliminate the scarring and scotch marks caused by axial shifting of the rolls, the contact zone must be kept in a non-all statical friction state. The non-all statical friction condition may be met by controlling the shifting velocity. In the control system of the present invention, the shifting distance of the roll and the shifting velocity of the cylinder are controlled in a closed loop system. Because the setting accuracy when shifting rolls directly influences the strip shape quality, the closed loop of roll position is taken as the outer loop of the system and shifting velocity is established as the inner loop. Displacement transducers and velocity transducers are used to generate control signals base on the actual shifting distance and actual shifting velocity.

Patent Country

US

Patent Number

US5448901

Publication Date

9-12-1995

Assignee(s)

The University of Toledo

Application Number

08/237058

Filing Date

May 1994

Primary Class

72/7.2

Secondary Class

72/12.1; 72/13.4; 72/247; 700/154

Rights

These materials are free of copyright restrictions and are in the public domain within the United States only. The USPTO reserves the right to assert copyright protection internationally.

Institution

The University of Toledo

Repository

University of Toledo Libraries

Digital Publisher

Digital Initiatives

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