First-pass closed roll gap tail-swing rolling method for reversible cold rolling mill

Abstract

The invention provides a first-pass closed roll gap tail-swing rolling method for a reversible cold rolling mill. The method comprises the steps of lowering the speed of a unit to a low speed before the first-pass closed roll gap tail-swing process, and controlling an uncoiling machine compression roll, an uncoiling and pinching roll compression roll, an inlet turning and pinching roll compression roll, an outlet turning and pinching roll compression roll and an outlet coiling machine compression roll to compress strip steel; after an uncoiling machine loses tension, stopping the unit, pressing an inlet pressing plate table down and keeping an outlet coiling machine tensioned for realizing stable rolling in the tail-swing process; in the first-pass closed roll gap tail-swing process, adopting the constant rolling force control mode, thinning strip tails, preventing the thickness fluctuation of the strip tails from influencing the rolling state, setting a working roll and an intermediate roll to receive the roll bending force, preventing the strip steel from being deflected and spraying emulsion on the strip steel; after the first-pass closed roll gap tail-swing process is completed, lowering the rolling force of roll gaps, setting the working roll and the intermediate roll to receive the balance force and guaranteeing the position stability of the strip steel in the second-pass reverse tape threading process.

Description

technical field [0001] The invention relates to the technical field of cold-rolling and rolling technology, in particular to a closed-gap flick rolling method in the first pass of a reversing cold-rolling mill. Background technique [0002] The single-stand reversing cold rolling mill has the characteristics of flexible production organization, various product varieties and specifications, low investment cost, fast construction and quick return, and has been widely used in various iron and steel enterprises. However, the single-stand reversible rolling mill itself also has limitations, such as the yield. The yield of the single-stand reversible rolling mill is generally 3% to 8% lower than that of the cold tandem mill, which seriously restricts the reduction of the production cost of the single-stand reversible rolling mill and the market competition of products. force. Among the finished strips rolled by a single-stand reversing rolling mill, the strips with poor thickness...

AI Technical Summary

Problems solved by technology

[0003] At present, domestic single-stand reversing cold rolling mills basically adopt the control method of open roll gap tailing for the first pass tailing. This tailing method is simple to operate and control, and easy to implement, but its obvious disadvantages are The unrolled strip tail of the rolling mill is too long, which leads to the large diameter of the unrolled steel coil on the entrance coiler when the tail is flicked to complete the reverse threading, and the steel coil at the entrance coiler is likely to be caused when the second pass is started and the speed is increased. The inner ring of the coil is slipping, the rolling state is unstable, and the roll gap tailing method is low in the composition rate of the unit

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