CN-122007171-A - Control method for improving small thickness of head and tail of steel plate

CN122007171ACN 122007171 ACN122007171 ACN 122007171ACN-122007171-A

Abstract

The invention relates to a control method for improving the small thickness of the head and the tail of a steel plate, belongs to the technical field of the production of steel rolling of medium and wide plates, and solves the problem of the small thickness of the head and the tail of the steel plate in the production process of the steel rolling of the medium and wide plates in the prior art.

Inventors

ZHU RENCHAO
LIU LIXIANG
QIAN ZEWANG
HUO XIAOFEI
XIE FUQIANG
SU KEFENG
FAN ZHENYING
YANG JIANGUO

Assignees

常熟市龙腾新能装备科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260310

Claims (8)

1. The control method for improving the small thickness of the head and the tail of the steel plate is characterized by comprising the following steps: s1, determining a preset thickness interval to which a steel plate to be rolled belongs according to a target thickness of the steel plate to be rolled, and calling an initial roll gap compensation value corresponding to the thickness interval from a human-machine interaction interface (HMI); S2, confirming and correcting parameters, namely judging whether an initial compensation value needs to be adjusted according to thickness detection data of the steel plates with the same type of specifications recently by an operator, and inputting the corrected compensation value through a human-machine interaction interface (HMI) compensation and correction dialog box if the initial compensation value needs to be adjusted; S3, pre-compensation setting, namely automatically adjusting a pressing system before a steel plate bites into the rolling mill by the rolling mill control system according to the compensation value parameters confirmed in the S2, and completing pre-compensation adjustment of the roll gap; s4, rolling execution, wherein the rolling execution comprises the following steps: S41, performing head compensation rolling, namely starting head compensation control after a rolling mill control system detects a steel plate biting signal, calculating the passing length of the head of the steel plate according to the real-time speed of main transmission, and keeping a pre-compensated roll gap state when the calculated length is smaller than a preset head compensation action length; s42, performing rolling of the middle target thickness part, namely rolling the steel plate according to a conventional rolling process; S43, performing tail compensation rolling, namely calculating the residual rolling length of the pass in real time by a rolling mill control system in the rolling process, and controlling the rolling mill to adjust the roll gap to a compensation set value until the rolling of the pass is finished when the residual rolling length is smaller than the preset tail compensation action length; S5, detecting and feeding back after rolling, namely detecting the thickness of the rolled steel plate in the whole length, recording the thickness data of the head and tail parts, and optimizing and adjusting the compensation parameters of the subsequent batch.
2. The method for controlling the head-to-tail thickness of a steel plate in a wide and thick plate rolling process according to claim 1, wherein in the step of performing S41 head compensation rolling, the specific method for calculating the passing length of the head of the steel plate according to the main transmission real-time speed is as follows: And (3) performing time integration on the main transmission speed signal after biting the steel, calculating the length of the head of the steel plate entering the rolling mill in real time, and triggering a head compensation ending signal when the integral calculated value reaches the preset head compensation acting length.
3. The method for controlling the head-to-tail thickness of a steel plate in a wide and thick plate rolling process according to claim 1 or 2, wherein in the step of performing the S43 tail compensation rolling, the specific method for calculating the remaining rolling length of the pass in real time is as follows: And calculating the difference value between the total length and the real-time length, taking the difference value as the residual rolling length, and triggering the tail compensation to start when the residual rolling length is smaller than the preset tail compensation action length.
4. The method according to claim 3, wherein the predetermined thickness range in S1 includes a plurality of continuous ranges, each corresponding to a predetermined initial roll gap compensation value.
5. The method for controlling a head-to-tail thickness deviation of a steel sheet according to claim 4, wherein the preset thickness interval and the corresponding initial roll gap compensation value are as follows: When the target thickness is 80mm to 120mm, the initial roll gap compensation value is 0.3mm; when the target thickness is 120mm to 150mm, the initial roll gap compensation value is 0.3mm; when the target thickness is 150mm to 200mm, the initial roll gap compensation value is 0.5mm; when the target thickness is 200mm to 250mm, the initial roll gap compensation value is 1.0mm; when the target thickness is 250mm to 300mm, the initial roll gap compensation value is 1.2mm; when the target thickness is 300mm to 500mm, the initial roll gap compensation value is 1.5mm.
6. The method for controlling the thickness deviation of the head and the tail of the steel plate according to claim 1 or 5, wherein the rolling system in the step S3 comprises an electric rolling system and a hydraulic rolling system, and the pre-compensation setting is performed by coarse adjustment through the electric rolling system and fine adjustment through the hydraulic rolling system so as to complete the pre-compensation adjustment of the roll gap.
7. The method according to claim 6, wherein in the S4 rolling process, the rolling mill control system monitors the rolling force, the thickness variation of the steel plate and the actual roll gap value in real time, and dynamically adjusts the rolling force and the actual roll gap value by the hydraulic rolling system to ensure the stability of the rolling process.
8. The method according to claim 1 or 7, wherein the head-to-tail thickness data recorded in the detection and feedback after S5 rolling is stored in a database for updating the reference data on the man-machine interface for an operator to review in a subsequent production preparation step.

Description

Control method for improving small thickness of head and tail of steel plate Technical Field The invention belongs to the technical field of steel rolling production of medium-width thick plates, and particularly relates to an automatic thickness control method applied to the production process of the steel rolling of the medium-width thick plates, in particular to a control scene for solving the problem that the thickness of the heads and the tails of the steel plates is smaller. Background In the wide and thick plate production industry, a four-roller mill is one of core production equipment, the roll gap control of the four-roller mill mainly depends on the synergistic effect of an electric rolling system and a hydraulic rolling system, and the rolling of the target thickness of the steel plate is realized by accurately adjusting the size of the roll gap. However, in the actual production process, due to the complex dynamic characteristics of the rolling of the steel plate, a plurality of influencing factors exist, namely, on one hand, when the head and the tail parts of the steel plate enter the rolling mill, the sufficient tension support is lacked, so that the stress state of the roll gap of the rolling mill is different from that of the middle part of the steel plate, and on the other hand, special compensation design is not carried out aiming at the special working condition of the head and the tail rolling in the existing control program, so that the cooperative control precision of the electric reduction and the hydraulic reduction is deviated in the head and the tail regions. The problems directly lead to the occurrence of an area with the abnormally small thickness at the head and tail parts of the produced steel plate, the thickness of the area is often lower than the allowable deviation range of design requirements, and the thickness defect can bring a series of adverse effects that firstly, the steel plate with the insufficient head and tail thickness cannot meet the requirement of high-end customers on the thickness uniformity in the whole length range of the product, the application scene of the product is limited, secondly, in order to avoid the disqualification of the product caused by the small head and tail thickness, enterprises need to additionally reserve larger thickness allowance, the waste of steel resources is caused, and in addition, the head and tail parts with the small thickness possibly need subsequent cutting treatment, the production procedure and the production cost are increased, and meanwhile, the whole production efficiency is reduced. Disclosure of Invention The invention aims to provide a control method for improving the small thickness of the head and the tail of a steel plate, which solves the problem of the small thickness of the head and the tail of the steel plate in the wide and thick plate steel rolling production process in the prior art. The invention relates to a control method for improving the small thickness of the head and the tail of a steel plate, which comprises the following steps: s1, determining a preset thickness interval to which a steel plate to be rolled belongs according to a target thickness of the steel plate to be rolled, and calling an initial roll gap compensation value corresponding to the thickness interval from a human-machine interaction interface (HMI); S2, confirming and correcting parameters, namely judging whether an initial compensation value needs to be adjusted according to thickness detection data of the steel plates with the same type of specifications recently by an operator, and inputting the corrected compensation value through a human-machine interaction interface (HMI) compensation and correction dialog box if the initial compensation value needs to be adjusted; S3, pre-compensation setting, namely automatically adjusting a pressing system before a steel plate bites into the rolling mill by the rolling mill control system according to the compensation value parameters confirmed in the S2, and completing pre-compensation adjustment of the roll gap; s4, rolling execution, wherein the rolling execution comprises the following steps: S41, performing head compensation rolling, namely starting head compensation control after a rolling mill control system detects a steel plate biting signal, calculating the passing length of the head of the steel plate according to the real-time speed of main transmission, and keeping a pre-compensated roll gap state when the calculated length is smaller than a preset head compensation action length; s42, performing rolling of the middle target thickness part, namely rolling the steel plate according to a conventional rolling process; S43, performing tail compensation rolling, namely calculating the residual rolling length of the pass in real time by a rolling mill control system in the rolling process, and controlling the rolling mill to adjust the roll gap to a compensation set value until t