阅读说明：本技术 一种基于弹跳理论的轧钢甩尾自动调整方法 (Steel rolling drift automatic adjusting method based on bounce theory ) 是由 胡德勇 周少见 鲁剑龙 张永刚 陆凤慧 赵颖 于 2020-05-09 设计创作，主要内容包括：本发明涉及一种基于弹跳理论的轧钢甩尾自动调整方法,属于钢铁工业生产和自动化控制技术领域。本发明的技术方案是：通过带钢稳定轧制时的轧制力偏差、抛钢尾部轧制力偏差、轧机刚度、轧制速度、带钢宽度、带钢厚度等,判断带钢抛钢尾部跑偏方向及跑偏量,从自动化一级将带钢跑偏量叠加到辊缝调整,从而实现带钢抛钢水平值的自动调整。本发明从抛钢过程的轧制力变化分析带钢尾部跑偏方向和跑偏量,结合轧钢弹跳理论对带钢尾部进行自动调整,避免带钢抛钢甩尾、特别是薄规格抛钢甩尾的发生,为提高产品质量和生产效能奠定基础。(The invention relates to a steel rolling drift automatic adjusting method based on a bounce theory, and belongs to the technical field of steel industrial production and automatic control. The technical scheme of the invention is as follows: the deviation direction and the deviation amount of the steel throwing tail of the strip steel are judged through the rolling force deviation, the deviation of the steel throwing tail rolling force, the rigidity of a rolling mill, the rolling speed, the width of the strip steel, the thickness of the strip steel and the like when the strip steel is stably rolled, the deviation amount of the strip steel is superposed to the roll gap adjustment from the automation level, and therefore the automatic adjustment of the steel throwing level of the strip steel is achieved. The invention analyzes the deviation direction and the deviation amount of the tail part of the strip steel from the rolling force change in the steel throwing process, and automatically adjusts the tail part of the strip steel by combining the steel rolling bounce theory, thereby avoiding the steel throwing drift of the strip steel, particularly the thin steel throwing drift, and laying a foundation for improving the product quality and the production efficiency.)

1. A steel rolling drift automatic adjustment method based on a bounce theory is characterized by comprising the following steps:

step 1: after the supporting roll is replaced, the rigidity value of each frame rolling mill is measured, and the rigidity of the transmission side is recorded as M_DiAnd operating side stiffness is denoted M_OiRecording is carried out at an automatic level, and the supporting roller is automatically updated after being replaced every time;

step 2: from the automatic one-level real-time data when recording throwing the steel, include: relevant parameters such as rolling force, rolling speed, roll gap, rolling mill horizontal value, product width, product thickness, rolling mill rigidity when a supporting roll is replaced and the like;

step 3: and (3) carrying out related calculation on the data collected in the step (2), and specifically comprising the following steps:

step 3-1: calculating the average deviation value of the F2 rolling force lasting for 2 seconds by taking the steel throwing time of the F1 frame as a starting point, and recording the average deviation value as P₂；

Step 3-2: calculating the average value of the deviation of the F3 rolling force from the F1 steel throwing to the F2 steel throwing, and recording the average value as P₃；

Step 3-3: calculating the average value of the deviation of the rolling force of F4 from F2 steel throwing to F3 steel throwing, and recording the average value as P₄；

Step 4: after the data in the step 2 are calculated, the variation of the deviation of the steel throwing rolling force is calculated, and the specific steps are as follows:

step 4-1: after the calculation of the step 3-1 is finished, acquiring a real-time value of the deviation of the rolling force F2, and recording the real-time value as P_2XCalculating the variation P of the deviation of the rolling force of the cast steel₂=P_2X-P₂；

Step 4-2: acquiring an F3 rolling force deviation real-time value from the moment of F2 steel throwing, and recording the real-time value as P_3XCalculating the variation P of the deviation of the rolling force of the cast steel₃=P_3X-P₃；

Step 4-3: acquiring an F4 rolling force deviation real-time value from the moment of F3 steel throwing, and recording the real-time value as P_4XCalculating the variation P of the deviation of the rolling force of the cast steel₄=P_4X-P₄；

And 5: judging the deviation direction of the tail part of the strip steel, and calculating the deviation value of the rolling force of each rack = the rolling force of the transmission side-the rolling force of the operation side according to the system calculation rule; the variation of the deviation of the rolling force of the frame cast steel is P_iX(i-denotes the frame number), if P_iXIf more than 0, the tail part of the strip steel deviates to the transmission side, if P is greater than 0_iXIf the tail part of the strip steel deviates to the operation side, the tail part of the strip steel deviates to the operation side;

step 6: calculating the roll gap bounce caused by the variation of the rolling force deviation according to the step 1 and the step 5, if P_iXIf the roll gap is larger than 0, the roll gap bounce amount of the transmission side is f_Di=P_iX/M_DiIf P is_iXIf < 0, the roll gap bounce amount on the operation side is f_Oi=P_iX/M_Oi；

And 7: automatic tail flick adjustment, according to step 6, if P_iXIf > 0, the roll gap on the transmission side needs to be pressed down by f_DiIf P is_iXIf less than 0, the roll gap at the transmission side needs to be lifted up f_Oi。

2. The automatic adjusting method of the steel rolling drift based on the bounce theory as claimed in claim 1, wherein: the determination of the tail deviation direction in step 5 guides the adjustment of the tail direction.

3. The automatic adjusting method of the steel rolling drift based on the bounce theory as claimed in claim 1, wherein: the determination of the roll gap bounce, as set forth in step 6, ensures that the adjustment does not under-adjust or over-adjust.

Technical Field

The invention relates to a steel rolling drift automatic adjusting method based on a bounce theory, and belongs to the crossing technical field of steel industry production and automatic control.

Background

With the development of the steel industry in China, the industry integrally enters a micro-profit era, the form is more and more severe, and each large steel enterprise seeks its own breakthrough, such as equipment upgrading, market structure adjustment, product structure and the like, and the final aim is to improve the profitability of the product and reduce the production cost. The high-strength thin specification is one of products with great market competitiveness, and is mainly reflected in two points: the first is light weight, and the second is "heat instead of cold". For the production of high-strength thin specifications, the requirement on a production line is high, and the requirements on equipment level and control capability are very high. The ESP has an inherent technical bottleneck on high-strength thin-specification production at present, and mainly solves the performance problem caused by insufficient compression ratio; the technical bottleneck of the conventional production line is the control of the rolling stability, which is mainly reflected in overlarge loss and high production cost caused by scrap steel, scraping and tearing and tail flicking. Under the circumstances, the recent new methods of rolling mill rigidity management, gap management and the like relieve partial pressure, but the scratch and tail control is still one of the major technical bottlenecks of thin-specification production.

With the development of computer technology, communication technology and information technology, hot rolling production lines have been provided with the ability to collect and store mass production data. Therefore, the control of rolling stability based on industrial data has attracted considerable attention from researchers. The method for monitoring the steel throwing tail part by installing a special camera is one of the commonly used methods, but the camera needs to be installed above the rolling mill, so that the monitoring is difficult and even deviation occurs due to rolling mill vibration and water vapor between racks, and adjustment errors can be caused.

Disclosure of Invention

The invention aims to provide a steel rolling drift automatic adjustment method based on a bounce theory, which analyzes the deviation direction and the deviation quantity of the tail part of a strip steel from the change of rolling force in the steel throwing process according to the process characteristics of the hot rolling strip steel, automatically adjusts the tail part of the strip steel by combining the steel rolling bounce theory, avoids the steel throwing drift of the strip steel, particularly the thin-specification steel throwing drift, lays a foundation for improving the product quality and the production efficiency, and effectively solves the problems in the background technology.

The technical scheme of the invention is as follows: a steel rolling drift automatic adjustment method based on a bounce theory comprises the following steps:

step 1: after the supporting roll is replaced, the rigidity value of each frame rolling mill is measured, and the rigidity of the transmission side is recorded as M_DiAnd operating side stiffness is denoted M_OiRecording is carried out at an automatic level, and the supporting roller is automatically updated after being replaced every time;

step 2: from the automatic one-level real-time data when recording throwing the steel, include: relevant parameters such as rolling force, rolling speed, roll gap, rolling mill horizontal value, product width, product thickness, rolling mill rigidity when a supporting roll is replaced and the like;

step 3: and (3) carrying out related calculation on the data collected in the step (2), and specifically comprising the following steps:

step 3-1: calculating the average deviation value of the F2 rolling force lasting for 2 seconds by taking the steel throwing time of the F1 frame as a starting point, and recording the average deviation value as P₂；

Step 3-2: calculating the average value of the deviation of the F3 rolling force from the F1 steel throwing to the F2 steel throwing, and recording the average value as P₃；

Step 3-3: calculating the average value of the deviation of the rolling force of F4 from F2 steel throwing to F3 steel throwing, and recording the average value as P_4；

Step 4: after the data in the step 2 are calculated, the variation of the deviation of the steel throwing rolling force is calculated, and the specific steps are as follows:

step 4-1: after the calculation of the step 3-1 is finished, acquiring a real-time value of the deviation of the rolling force F2, and recording the real-time value as P_2XCalculating the variation P of the deviation of the rolling force of the cast steel₂=P_2X-P₂；

Step 4-2: acquiring an F3 rolling force deviation real-time value from the moment of F2 steel throwing, and recording the real-time value as P_3XCalculating the variation P of the deviation of the rolling force of the cast steel₃=P_3X-P₃；

Step 4-3: acquiring an F4 rolling force deviation real-time value from the moment of F3 steel throwing, and recording the real-time value as P_4XCalculating the variation P of the deviation of the rolling force of the cast steel₄=P_4X-P₄；

And 5: judging the deviation direction of the tail part of the strip steel, and calculating the deviation value of the rolling force of each rack = the rolling force of the transmission side-the rolling force of the operation side according to the system calculation rule; the variation of the deviation of the rolling force of the frame cast steel is P_iX(i-denotes the frame number), if P_iXIf more than 0, the tail part of the strip steel deviates to the transmission side, if P is greater than 0_iXIf the tail part of the strip steel deviates to the operation side, the tail part of the strip steel deviates to the operation side;

step 6: calculating the roll gap bounce caused by the variation of the rolling force deviation according to the step 1 and the step 5, if P_iXIf the roll gap is larger than 0, the roll gap bounce amount of the transmission side is f_Di=P_iX/M_DiIf P is_iXIf < 0, the roll gap bounce amount on the operation side is f_Oi=P_iX/M_Oi；

And 7: automatic tail flick adjustment, according to step 6, if P_iXIf > 0, the roll gap on the transmission side needs to be pressed down by f_DiIf P is_iXIf less than 0, the roll gap at the transmission side needs to be lifted up f_Oi。

The determination of the tail deviation direction in step 5 guides the adjustment of the tail direction.

The determination of the roll gap bounce, as set forth in step 6, ensures that the adjustment does not under-adjust or over-adjust.

The invention has the beneficial effects that: according to the process characteristics of hot-rolled strip steel, the deviation direction and the deviation amount of the tail part of the strip steel are analyzed from the change of the rolling force in the steel throwing process, and the tail part of the strip steel is automatically adjusted by combining a steel rolling bounce theory, so that the steel throwing drift of the strip steel, particularly the thin-specification steel throwing drift, is avoided, and a foundation is laid for improving the product quality and the production efficiency.

Drawings

FIG. 1 is a schematic diagram of the setting and adjusting frequency of the present invention;

FIG. 2 is a diagram of a function commissioning selection button of the present invention;

FIG. 3 is a schematic view of automatic tail flick adjustment in embodiment 1 of the present invention;

fig. 4 is a schematic diagram of automatic tail flick adjustment in embodiment 2 of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions of the embodiments of the present invention with reference to the drawings of the embodiments, and it is obvious that the described embodiments are a small part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work based on the embodiments of the present invention belong to the protection scope of the present invention.

A steel rolling drift automatic adjustment method based on a bounce theory comprises the following steps:

step 1: after the supporting roll is replaced, the rigidity value of each frame rolling mill is measured, and the rigidity of the transmission side is recorded as M_DiAnd operating side stiffness is denoted M_OiRecording is carried out at an automatic level, and the supporting roller is automatically updated after being replaced every time;

step 2: from the automatic one-level real-time data when recording throwing the steel, include: relevant parameters such as rolling force, rolling speed, roll gap, rolling mill horizontal value, product width, product thickness, rolling mill rigidity when a supporting roll is replaced and the like;

step 3: and (3) carrying out related calculation on the data collected in the step (2), and specifically comprising the following steps:

step 3-1: calculating the average deviation value of the F2 rolling force lasting for 2 seconds by taking the steel throwing time of the F1 frame as a starting point, and recording the average deviation value as P₂；

Step 3-2: calculating the average value of the deviation of the F3 rolling force from the F1 steel throwing to the F2 steel throwing, and recording the average value as P₃；

Step 3-3: calculating the average value of the deviation of the rolling force of F4 from F2 steel throwing to F3 steel throwing, and recording the average value as P_4；

Step 4: after the data in the step 2 are calculated, the variation of the deviation of the steel throwing rolling force is calculated, and the specific steps are as follows:

step 4-1: after the calculation of the step 3-1 is finished, acquiring a real-time value of the deviation of the rolling force F2, and recording the real-time value as P_2XCalculating the variation P of the deviation of the rolling force of the cast steel₂=P_2X-P₂；

Step 4-2: f2, collecting a real-time value of the deviation of the F3 rolling force from the moment of throwing the steel and recording the real-time value as P_3XCalculating the variation P of the deviation of the rolling force of the cast steel₃=P_3X-P₃；

Step 4-3: acquiring an F4 rolling force deviation real-time value from the moment of F3 steel throwing, and recording the real-time value as P_4XCalculating the variation P of the deviation of the rolling force of the cast steel₄=P_4X-P₄；

And 5: judging the deviation direction of the tail part of the strip steel, and calculating the deviation value of the rolling force of each rack = the rolling force of the transmission side-the rolling force of the operation side according to the system calculation rule; the variation of the deviation of the rolling force of the frame cast steel is P_iX(i-denotes the frame number), if P_iXIf more than 0, the tail part of the strip steel deviates to the transmission side, if P is greater than 0_iXIf the tail part of the strip steel deviates to the operation side, the tail part of the strip steel deviates to the operation side;

step 6: calculating the roll gap bounce caused by the variation of the rolling force deviation according to the step 1 and the step 5, if P_iXIf the roll gap is larger than 0, the roll gap bounce amount of the transmission side is f_Di=P_iX/M_DiIf P is_iXIf < 0, the roll gap bounce amount on the operation side is f_Oi=P_iX/M_Oi；

And 7: automatic tail flick adjustment, according to step 6, if P_iXIf > 0, the roll gap on the transmission side needs to be pressed down by f_DiIf P is_iXIf less than 0, the roll gap at the transmission side needs to be lifted up f_Oi。

The determination of the tail deviation direction in step 5 guides the adjustment of the tail direction.

The determination of the roll gap bounce, as set forth in step 6, ensures that the adjustment does not under-adjust or over-adjust.

A steel rolling drift automatic adjustment method based on a bounce theory mainly comprises the steps of calculating the rigidity of a rolling mill, calculating the deviation of rolling force, calculating the deviation variation of the rolling force, calculating the bounce of a deviation roll gap of the rolling force, adjusting the horizontal value of the roll gap of the rolling mill and the like, and specifically comprises the following steps:

1. after the supporting roll is replaced, the rolling mill is pressed to test the rigidity of the rolling mill, and the formula is as follows:

y=Mx+b

m is stiffness, x is roll gap, and y is press rolling force

To eliminate the effect of the non-linear region, the calculation is started when y is more than or equal to 200 tons. Respectively calculating the rigidity values of two sides of each rack according to a formula, wherein the rigidity of the transmission side of the ith rack is recorded as M_DiAnd operating side stiffness is denoted M_Oi. The rigidity value is automatically updated after the supporting roller is replaced, and inaccurate adjustment caused by large rigidity difference is avoided.

2. Calculating the average deviation value of the F2 rolling force lasting for 2 seconds by taking the steel throwing time of the F1 frame as a starting point, and recording the average deviation value as P₂(ii) a Calculating the average value of the deviation of the F3 rolling force from the F1 steel throwing to the F2 steel throwing, and recording the average value as P₃(ii) a Calculating the average value of the deviation of the rolling force of F4 from F2 steel throwing to F3 steel throwing, and recording the average value as P₄. The average value of the rolling force deviation is calculated in order to avoid deviation or adjustment error of the roll gap adjustment caused by the periodic fluctuation of the rolling force.

3. After F1 steel throwing for 2 seconds, recording the real-time rolling force deviation of F2 as P_2XCalculating the variation of the rolling force deviation at the tail part of the F2 rack to be P₂=P_2X-P₂(ii) a Such as P₂If the adjustment amount is more than 0, the adjustment amount of the F2 steel throwing roll gap is the transmission side lower compression roll gap F_D2=P_2X/M_D2(ii) a Such as P₂If less than 0, the adjustment amount of the F2 steel throwing roll gap is the roll gap F of the lifting roll on the transmission side_O2=P_2X/M_O2. After F2 steel throwing, recording the real-time rolling force deviation of F3 as P_3XCalculating the variation of the rolling force deviation at the tail part of the F3 rack to be P₃=P_3X-P₃(ii) a Such as P₃If the adjustment amount is more than 0, the adjustment amount of the F3 steel throwing roll gap is the transmission side lower compression roll gap F_D3=P_3X/M_D3(ii) a Such as P₃If less than 0, the adjustment amount of the F3 steel throwing roll gap is the roll gap F of the lifting roll on the transmission side_O3=P_3X/M_O3. After F3 steel throwing, recording the real-time rolling force deviation of F4 as P_4XCalculating the variation of the rolling force deviation at the tail part of the F4 rack to be P₄=P_4X-P₄(ii) a Such as P₄If the gap is more than 0, adjusting the gap between the F4 steel throwing rollsMeasured as the drive side lower nip f_D4=P_4X/M_D4(ii) a Such as P₄If less than 0, the adjustment amount of the F4 steel throwing roll gap is the roll gap F of the lifting roll on the transmission side_O4=P_4X/M_O4。

4. Because the frame is thrown the steel time and is always to unilateral off tracking (transmission side or operation side) at the band steel afterbody, the variation of rolling force deviation is unilateral change (increase progressively or decrease progressively), because the roll gap adjustment volume is the real-time calculation change, then need to add up the calculation with the adjustment volume that needs, then:

new adjustment = total adjustment required-adjusted amount

5. In order to avoid adjustment errors caused by large camber and S-shaped camber of rough rolling incoming materials, the adjustment amount and the adjustment time interval are controlled according to the speed of the rolling mill and the width of a finished product, as shown in figure 1.

6. In order to select different frames for drift adjustment control according to different thicknesses, a drift automatic adjustment function selection button is added on the picture, as shown in fig. 2.