Rolling characteristics of new compact multi-reduction mill.

概要

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Increasing the rolling reduction in thickness in one mill stand contributes to realize a compact mill line and less initial and running cost.For this purpose many studies about the effect of the work roll diameter in case of conventional mill were tried out and it was recognized that the maximum rolling reduction per stand is about 45-55% at most.In order to achieve the high reduction over 70% in one cold rolling stand, "The three-gap rolling method" has been investigated. This New Compact Multi-Reduction Mill (NCM) consists of four work rolls arranged vertically in one housing and the strip is threaded through three roll gaps.The practical stable rolling condition has been accomplished on a test mill by regulating the tension, roll speed difference, rolling force, etc. Such rolling characteristics as the number of work rolls to be driven, the conditions to realize the optimum inter-gap tensions, and the position of the neutral points have been investigated theoretically. Further the rolling characteristics such as rolling force, torque, tensions, forward slip, rolling energy, and the optimum rolling conditions have been investigated experimentally.The new compact multi-reduction mill enables the high reduction over 70% in one stand and gives sound strip surfaces by applying improved lubrication.Finally the possibility of practical applications for tandem cold mills and reversing cold mills are discussed.
The Iron and Steel Institute of Japanの論文