Abstract
Roller ends forced-contact and overmuch roll consumption are the widespread problems in temper rolling process of thin strip for two-stand UCM temper mill. Fully thinking the equipment and technology characteristics of UCM temper mill, we took the newly-built 1220 UCM temper mill of Baosteel as the research object in this paper. A model of roller ends forced-contact and a calculation model of flatness for UCM temper mill are established after a great deal of site tracing and theoretical researches. On this basis, an optimal mathematical model of roll shape which is suited for UCM temper mill is developed. Working roll curve is the combination of cosine curve and high order curve. The cosine subentry is used to control edge wave, the high order curve subentry is used to control roller ends forced-contact. Furthermore, the chamfering curve of middle roller end is optimized. Those are the innovations. Through the above-mentioned technology, pressure distribution between rollers caused by the shift of middle roll becomes more homogeneous, pressure peak disappeared, working life of roll is improved effectively as well. Relevant technologies have been used to the practice of 1220 UCM temper mill of Baosteel and have achieved good use effects, which is of further extending application value.
Highlights
Introduction for Test Results of FieldComparison To further analyses the roll shape reconstruction effect of the newly-built 1220 two-stand UCM temper mill of Baosteel, as a contrast, take the second stand as the example, working roll and intermediate roll adopt the roll configuration curve illustrated in Equation (63) and Equation (64) respectively, back-up roll adopts flat roll. 0.15 × 718 mm was choosed as specimen to do the forced-contact test
Roller ends forced-contact and overmuch roll consumption are the widespread problems in temper rolling process of thin strip for two-stand UCM temper mill
A model of roller ends forced-contact and a calculation model of flatness for UCM temper mill are established after a great deal of site tracing and theoretical researches
Summary
The intermediate roll should have proper shift for improving strip shape in the process of temper rolling. The contact of working rolls outside the plate width will appear when thin and narrow strip is temper rolled. Due to the requirements of customers for strip mechanical performance, strip shape and surface quality become higher and higher and the cost for rollers compressed constantly as well, the problems above are bottleneck problems and the focus of technology research in the temper rolling process of thin and narrow strip. The following three targets are realized through the optimizing design of roll configuration: 1) good flatness of rolled strip; 2) without forced-contact of working rolls; 3) The pressure distribution between roll-. Ers caused by the shift of middle roll become more homogeneous Side effects such as peak are disappeared. Working life of roll is improved effectively [1]
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