Abstract
Many computer-controlled hot strip mills have been installed world-wide since the mid-1960's. The basic functions provided for such installations are well-documented in other papers. This paper reviews some basic design requirements felt to be necessary for successful long-term optimal performance of a strip mill control system for a mill willi a large product mix and relatively small order lots. It is based on four years experience with a computer control system retrofitted to an existing hot strip mill.A review of the control system is presented and used to illustrate the reason for the design requirements.A number of critical questions affecting the design requirements are also reviewed. It is shown that in many cases there is a conflict between customer objectives and requirements and vendor objectives.Some of the questions addressed are:a)Under what conditions will on-going modifications and tuning be required to maintain adequate mill performance?b)What is the sensitivity of the control system to various process disturbances (furnace practice, product mix, physical condition of mill and sensors, etc.)?c)What level of skills are available in plant operations, technical and maintenance personnel to provide on-going support?d)What are the software implications if it becomes necessary to add new functions or re-design existing functions?
Published Version
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