Design And Application Of Width Automatic Control Control System On Hot Strip Edger Mill

With the quality requirements of end-user for strip products continues to increase., Hot-rolled products not only to ensure the accuracy of the thickness of the finished strip, finishing temperature, coiling temperature and flatness, but also must ensure the accuracy of the width of the strip.The core of the finished strip width control is the precise control of the Vertical rolling mill. High-precision control of the strip width can be reduced strip trimming loss, reduce head and tail shearing amount, which can improve the strip finished product rate, for the production of hot-rolled to create a huge direct economic benefits.Based on the Shougang Qiangang1580hot-rolled production line strip width control precision problem of low status quo, This paper systematically studied the structural characteristics of the vertical roller mill, and in-depth analysis and study the site of the original strip width control system, Pointed out the Shougang Qiangang vertical roller mill positioned hydraulic cylinder control accuracy is not high, and the dynamic response is poor. Therefore proposed the improvement of vertical roll hydraulic cylinder position control function. Designed of NULL Bias compensation controller, speed balance control compensator, automatic flow gain compensation controller, hydraulic cylinder position gain compensation controller and the impact of the compensation controller, Solve the problem of the positioning hydraulic cylinder of the same side or both sides of the positional deviation in the independent position of the closed-loop control process., Also solve the problem of slow response and control accuracy is not high., which greatly improves the dynamic response of vertical roller hydraulic cylinder position control performance and position control accuracy.The original width control system of the vertical rolling mill uses a single closed-loop position controller, there are unable to meet the slab width control precision, and the frequent fluctuations of the slab body width and head and tail size exceeded, In this paper improve and perfect the automatic width control system of the vertical roll. Given and to optimize the head and tail short stroke control strategy, reducing the finished strip head and tail cut loss; The design of the rolling force automatic width control program to ensure that the strip body width constant, eliminating the influence of the slab width accuracy because of slab temperature drop or local low temperature; Introduce and optimize the rolling pass feedforward automatic width control method. Use the flat-roll mill rolling force fluctuations data of the Even pass, to achieve the width of the feed-forward compensation of vertical roll odd pass, eliminating the width accuracy influence of watermark strip distribution; Developed necking compensation control technology to achieve a vertical roller opening pre-adjustment function, eliminating the width "necking" problem be caused of Looper impact on the strip and take-up control switch improper; Design and development of the width of the feedforward control method can predict the location of the watermark point through the mill behind the width measuring instrument, achieved the the R2E vertical rolling mill roll gap pre-compensation function, effectively solved the problem of the strip width rebound. The development of constant tension control technology On the strip edge, avoided the damage to the vertical roll mill, which due to the width of the abnormal or hardness over the limit, ensure that the safety and stable running of the vertical roll.The above improvement program has greatly improved the safety performance and operational efficiency of the vertical roller position system. At the same time, the abnormal fluctuations of the slab width is quickly eliminated.Regulation characteristics of the system has been improved. The practical effect of verification, the improvement of the automatic width control function of the vertical roll-mill, Can be very significant improvements in the accuracy of finishing export strip width. After optimization of the system, Finishing export strip width deviation ranges gradually enhanced from-7.8mm～10mm to-0.5mm～2.5mm, reached the advanced level of the domestic hot-rolled strip width control accuracy.