Method for controlling axial shifting of rolls

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.
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Abstract/Description: 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.
Subject(s): 72/7.2
72/12.1
72/13.4
72/247
700/154
Date Issued: 1995-09-12
Title: Method for controlling axial shifting of rolls.
Name(s): The University of Toledo, assignee
Yu, Qiulin, inventor
Fu, Kuan-chen, inventor
Type of Resource: text
Genre: patent
Publisher: United States Patent and Trademark Office
Other Date: Date Filed: 1994-05-03
Date Issued: 1995-09-12
Physical Form: application/pdf
Extent: 17 p.
Abstract/Description: 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.
Identifier(s): utpatents-US5448901 (IID)
Patent No.: US5448901 (patno)
Appl. No.: 08/237058 (appno)
Subject(s): 72/7.2
72/12.1
72/13.4
72/247
700/154
Held by: United States Patent and Trademark Office (USPTO) Public Search Facility
Location: University of Toledo Digital Repository
Rights Statement: No Copyright - United States
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