CN111530940B - Steel rolling drift automatic adjusting method based on bounce theory - Google Patents
Steel rolling drift automatic adjusting method based on bounce theory Download PDFInfo
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- CN111530940B CN111530940B CN202010388821.2A CN202010388821A CN111530940B CN 111530940 B CN111530940 B CN 111530940B CN 202010388821 A CN202010388821 A CN 202010388821A CN 111530940 B CN111530940 B CN 111530940B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/72—Rear end control; Front end control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/12—Rolling load or rolling pressure; roll force
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2271/00—Mill stand parameters
- B21B2271/06—Mill spring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2273/00—Path parameters
- B21B2273/12—End of product
- B21B2273/16—Tail or rear end
Abstract
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.
Description
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 MDiAnd operating side stiffness is denoted MOiRecording is carried out at an automatic level, and the supporting roller is automatically updated after being replaced every time;
step 2: automatic change real-time data when one-level record is thrown the steel, include: rolling force, rolling speed, roll gap, rolling mill horizontal value, product width, product thickness and rolling mill rigidity related parameters when a supporting roll is replaced;
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 P2XCalculating the variation delta P of the deviation of the cast steel rolling forceiX=P2X-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 P3XCalculating the variation delta P of the deviation of the cast steel rolling forceiX=P3X-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 P4XCalculating the variation delta P of the deviation of the cast steel rolling forceiX=P4X-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 delta PiXI-denotes the frame number if deltaPiXIf the deviation is more than 0, the tail part of the strip steel deviates to the transmission side, if delta P is greater thaniXIf 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 delta PiXIf the roll gap is larger than 0, the roll gap bounce amount of the transmission side is fDi=δPiX/MDiIf δ PiXIf < 0, the roll gap on the operation side is bouncedAmount fOi=δPiX/MOi；
And 7: automatic tail flick adjustment, according to step 6, if delta PiXIf > 0, the roll gap on the transmission side needs to be pressed down by fDiIf δ PiXIf less than 0, the roll gap at the transmission side needs to be lifted up fOi。
And 5, determining the deviation direction of the strip steel tail, which 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 MDiAnd operating side stiffness is denoted MOiRecording is carried out at an automatic level, and the supporting roller is automatically updated after being replaced every time;
step 2: automatic change real-time data when one-level record is thrown the steel, include: rolling force, rolling speed, roll gap, rolling mill horizontal value, product width, product thickness and rolling mill rigidity related parameters when a supporting roll is replaced;
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 P2XCalculating the variation delta P of the deviation of the cast steel rolling forceiX=P2X-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 P3XCalculating the variation delta P of the deviation of the cast steel rolling forceiX=P3X-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 P4XCalculating the variation delta P of the deviation of the cast steel rolling forceiX=P4X-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 delta PiXI-represents a frame number,if delta PiXIf the deviation is more than 0, the tail part of the strip steel deviates to the transmission side, if delta P is greater thaniXIf 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 delta PiXIf the roll gap is larger than 0, the roll gap bounce amount of the transmission side is fDi=δPiX/MDiIf δ PiXIf < 0, the roll gap bounce amount on the operation side is fOi=δPiX/MOi；
And 7: automatic tail flick adjustment, according to step 6, if delta PiXIf > 0, the roll gap on the transmission side needs to be pressed down by fDiIf δ PiXIf less than 0, the roll gap at the transmission side needs to be lifted up fOi。
And 5, determining the deviation direction of the strip steel tail, which 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:
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 MDiAnd operating side stiffness is denoted MOi. The rigidity value is automatically updated after the supporting roller is replaced, and inaccurate adjustment caused by large rigidity difference is avoided.
2. Moment of throwing steel by F1 frameAs a starting point, the average value of the deviations of the F2 rolling force lasting for 2 seconds was calculated and recorded 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 P2XCalculating the variation delta P of the rolling force deviation at the tail part of the F2 rackiX=P2X-P2(ii) a Such as deltaP2If 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 FD2=δP2X/MD2(ii) a Such as deltaP2If 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 sideO2=δP2X/MO2. After F2 steel throwing, recording the real-time rolling force deviation of F3 as P3XCalculating the variation delta P of the rolling force deviation at the tail part of the F3 rackiX=P3X-P3(ii) a Such as deltaP3If 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 FD3=δP3X/MD3(ii) a Such as deltaP3If 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 sideO3=δP3X/MO3. After F3 steel throwing, recording the real-time rolling force deviation of F4 as P4XCalculating the variation delta P of the rolling force deviation at the tail part of the F4 rackiX=P4X-P4(ii) a Such as deltaP4If the adjustment amount is more than 0, the adjustment amount of the F4 steel throwing roll gap is the transmission side lower compression roll gap FD4=δP4X/MD4(ii) a Such as deltaP4If 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 sideO4=δP4X/MO4。
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.
Example 1:
the present invention will be further described with reference to the following specific examples.
The invention provides a steel rolling drift automatic adjusting method based on a bounce theory, which mainly comprises the steps of calculating the rigidity of a rolling mill, the deviation variable quantity of a steel throwing rolling force, calculating the roll gap bounce caused by the deviation of the rolling force, adjusting the roll gap and the like on line.
Taking the adjustment of an F4 frame when the Q235B is rolled on a certain day, the thickness is 1.2mm, and the width is 1250mm as an example:
f4 Rolling Mill stiffness 284t/mm for drive side and 300t/mm for operation side have been calculated at the time of replacement of backup rolls.
The average value of the rolling force deviation of the F4 stand from the time when the F2 stand was cast to the time when the F3 stand was cast was 9.7 tons.
F4 the frame throws the steel and can see that the rolling force deviation is increased gradually, and the tail of the strip steel is judged to be deviated to the transmission side.
4. According to the offset direction of the tail of the strip steel and the rigidity of the rolling mill, the roll gap adjustment amount is automatically calculated, the tail flicking is automatically adjusted, and the roll gap of the transmission side of the steel is pressed down.
The above judgment, calculation and adjustment are as shown in FIG. 3.
Example 2:
taking the adjustment of an F4 rack when SS400 is rolled on a certain day, the thickness is 1.4mm, and the width is 1250mm as an example:
f4 Rolling Mill stiffness 284t/mm for drive side and 300t/mm for operation side have been calculated at the time of replacement of backup rolls.
The average value of the rolling force deviation of the F4 stand from the time when the F2 stand throws steel to the time when the F3 stand throws steel is 0.23 ton.
F4 the frame throws steel and shows that the rolling force deviation is gradually reduced, and the tail part of the strip steel is judged to be deviated to the operation side.
4. According to the offset direction of the tail of the strip steel and the rigidity of the rolling mill, the roll gap adjustment amount is automatically calculated, the tail flicking is automatically adjusted, and the roll gap of the transmission side of the steel is lifted.
The above judgment, calculation and adjustment are as shown in FIG. 4.
Claims (3)
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 MDiAnd operating side stiffness is denoted MOiRecording is carried out at an automatic level, and the supporting roller is automatically updated after being replaced every time;
step 2: automatic change real-time data when one-level record is thrown the steel, include: rolling force, rolling speed, roll gap, rolling mill horizontal value, product width, product thickness and rolling mill rigidity related parameters when a supporting roll is replaced;
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 P2XCalculating the variation delta P of the deviation of the cast steel rolling forceiX=P2X-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 P3XThrow by calculationVariation delta P of rolling force deviation of steeliX=P3X-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 P4XCalculating the variation delta P of the deviation of the cast steel rolling forceiX=P4X-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 cast steel is delta PiXI-denotes the frame number if deltaPiXIf the deviation is more than 0, the tail part of the strip steel deviates to the transmission side, if delta P is greater thaniXIf 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 delta PiXIf the roll gap is larger than 0, the roll gap bounce amount of the transmission side is fDi=δPiX/MDiIf δ PiXIf < 0, the roll gap bounce amount on the operation side is fOi=δPiX/MOi；
And 7: automatic tail flick adjustment, according to step 6, if delta PiXIf > 0, the roll gap on the transmission side needs to be pressed down by fDiIf δ PiXIf less than 0, the roll gap at the transmission side needs to be lifted up fOi。
2. The automatic adjusting method of the steel rolling drift based on the bounce theory as claimed in claim 1, wherein: and 5, determining the deviation direction of the strip steel tail, which 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.
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| CN112742879B (en) * | 2021-01-04 | 2022-08-19 | 南京钢铁股份有限公司 | Control method for camber of medium plate |
| CN114309087B (en) * | 2021-12-28 | 2022-09-30 | 北京科技大学 | Feed-forward continuous control method for tail deviation of strip steel of finishing mill group |
| CN114602977A (en) * | 2022-02-14 | 2022-06-10 | 唐山钢铁集团有限责任公司 | Control method for throwing steel and drifting of hot-rolled strip steel |
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