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The factors which affect achievable billet tolerances, such as stand spring, stock temperature etc, are reviewd, and the controlling equations which relate gap settings to the size of the finished product are given. The various approaches which are currently applied to the size control problem are then discussed, although it is found that application of the technologies developed for strip products (such as AGC) and for bar and rod (such as sizing stands) has not yet widely transferred to primary mills.
A programme of experimental trials conducted on a reversing finishing stand for rolling round cornered square billets is presented. This has examined the nature of the variation of billet size, both within a single billet and between successively rolled billets, and the nature of billet shapes in practice. The programme also examined the magnitude of the effect of process disturbances, such as changes in stock temperature, on billet size and the strength of the relationships expected from rolling theory between the measured variables in practice. A simulation model, based on the presented theory, has been developed and is described in the report. The results from simulation are compared with those from the experimental trials and used to illustrate a discussion on the use of computer control strategies to improve billet tolerances. The effect of rolling temperature on the finished size of the billet is found by simulation to be greater than the effect of variaton in feedstock size.

Additional information

Authors: THORP J H, British Steel, Swinden Laboratories, Rotherham (GB)
Bibliographic Reference: EUR 15815 EN (1996) 72pp., FS
Availability: Available from the (2)
ISBN: ISBN 92-827-7121-0
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