Method for automatically improving per-second flow balance of strip steel in hot continuous rolling strip threading process

Abstract

The invention provides a method for automatically improving per-second flow balance of strip steel in the hot continuous rolling strip threading process. Due to the fact that 'later' intervention of an operator is basically correct, the per-second flow balance can be changed more reasonable, an ideal rack speed matching value of a piece of steel is calculated by analysis the loop length and manual invention amount of the operator in the strip threading process and used for correcting setting of a next piece of same-specification steel. Compared with routine techniques, the method is characterized in that 'later intervention' is converted into accurate 'advanced correction', accordingly a complicated and tedious forward slip formula is omitted, and racks can have an 'intelligent learning' function on the speed aspect. According to the method, the complicated and tedious forward slip formula is omitted, and a method for automatically adjusting per-second flow matching between racks is found. The method is used for improving the per-second flow balance in the hot continuous rolling strip threading process and improving rolling stability so as to decrease strip steel head rolling breakage times and width decrease times. In addition, automation degree of strip threading is improved, and the working load of the operator is decreased.

Description

technical field [0001] The present invention relates to hot continuous rolling strip threading process, specifically, the present invention relates to a method for automatically improving the second flow balance of strip steel in the hot continuous rolling strip threading process, the method is used to improve the second flow balance of the strip threading process, improve Rolling stability to reduce strip head breakout. Background technique [0002] Strip threading in hot continuous rolling is a complex process of process change, which requires the strip to pass through multiple finishing stands quickly and smoothly while undergoing large deformation between each stand, such as figure 1 shown. Due to the limitations of the current technology in each process, the absolutely ideal rolling stock does not exist, and the process of threading is always accompanied by looper instability or wave shape problems caused by unbalanced second flow, these factors affect the stability of...

AI Technical Summary

Problems solved by technology

[0011] 1. The correct intervention needs to be acted after seeing the actual situation, which happens after the event, and has a "lag" in time, which cannot completely avoid quality loss;

[0012] 2. There are two ways to intervene, one is to adjust the speed with the speed hand, but to press down the hand to intervene in the roll gap, and affect the second flow by changing the thickness belt, but this method will affect the thickness accuracy and at the same time affect the thickness self-learning, resulting in the next block Inaccurate steel thickness setting will further affect the second flow balance and cause a vicious circle;

[0013] 3. Long-term manual intervention increases the burden of operation, and it is easy for operators to develop the habit of early intervention. However, early intervention is uncertain, which often leads to wrong intervention and has a counterproductive effect.

[0014] Due to the usual hot rolling production line, for example, the 1580 production line has a large amount of thin plate rolling, which has the characteristics of large deformation load and fast strip threading speed. The problem of second flow rate has always plagued the production line. If it is prominent, it will cause quality damage and blockade, and it will damage the roll and increase roll consumption. In the worst case, it will even cause scrap steel, damage equipment, and bring huge losses.

Images