Sendzimir mill computerization in BSC Stainless

Abstract

While the number of computers being used in the iron and steel industry is increasing rapidly, the number appearing in the area of single-stand cold mills is still relatively small. However, in recent years a number of Sendzimir mills rolling stainless steel have been fitted with computer control. Among these are the systems being installed with the new high-power ZR21 B–63in mills at the Shepcote Lane Works of BSC Stainless. The need for these computer systems was considered at the feasibility-study stage of the project and the justification was based on estimates of savings resulting from improvements in mill utilization by using optimized rolling schedules and by reducing the mill reversal time between each pass and for slow running at strip defects. Work on the development of mathematical models of the Z mill cold-rolling process has shown that, for a given set of coil and mill particulars and operating constraints, optimized rolling schedules could be produced which best utilize the high-power capabilities of the mill. By storing these rolling schedules in the computer and using them consistently, the production performance of the mill can be maintained at an optimum level. The paper gives brief details of the mills, the computer, and peripheral equipment, and describes more fully the computer-controlled functions to be provided. Plans for implementing these functions in four stages are given and progress is reported since commissioning of the first of the two mills in February 1977.