An automatic control method for roll gap deviation in a roughing R2 reversible rolling mill

Abstract

The present application relates to a kind of rough rolling R2 reversible rolling mill roll gap deviation automatic control method, comprising: collecting data, set adjustment interval number, calculate the first roll gap deviation adjustment amount and adjust, calculate the second roll gap deviation adjustment amount and adjust, calculate the third roll gap deviation adjustment amount and adjust etc.Step.The present application provides a kind of rough rolling R2 reversible rolling mill roll gap deviation online automatic control method, with rough rolling R2 rolling mill work roll replacement unit as a whole, by constructing adjustment interval number (i.e.steel width, width reduction and intermediate blank thickness similar steel), and acquisition each pass slab head and tail center offset actual data, each pass two sides side guide plate pressure data etc., according to incoming material shape, pass shape and adjacent steel shape etc.Consideration and all-round adjustment are made respectively, realize rough rolling reversible rolling mill roll gap deviation automatic control, while can improve the precision of sickle bend control about 10%.

Description

Technical Field

[0001] This invention relates to an automatic control method for roll gap deviation in a roughing R2 reversible rolling mill, belonging to the field of hot rolling technology. Background Technology

[0002] In hot-rolled strip steel production, roughing reversible mills generally include E1R1 and E2R2 mills, typically employing a 1-5 pass pattern (i.e., R1 rolls 1 pass, R2 rolls 5 passes) or a 3-3 pass pattern (i.e., R1 rolls 3 passes, R2 rolls 5 passes). Currently, the adjustment of roll gap deviation in roughing reversible mills is mainly used to control the accuracy of the camber at the beginning and end of the slab during rolling. This is generally achieved by operators monitoring the camber in real-time via video and visually assessing the degree of camber at the beginning and end of each pass, then manually adjusting the roll gap deviation for each pass to control the camber at the beginning and end of the rough-rolled slab within a reasonable range.

[0003] In recent years, with the development of detection and control technologies, researchers have begun to study how to achieve automatic control of roughing mill roll gap deviation, hoping to replace the original manual operation. The paper "An Automatic Control Technology for the Sickle Bending of Hot-Rolled Strip Based on Centerline Deviation" proposes to convert the centerline offset of the R1 and R2 exit strips into an automatic control of the roll gap deviation of the R1 and R2 mills through a certain functional relationship. However, this method only automatically adjusts the roll gap deviation based on the centerline offset data of the last pass of R1 and R2, failing to consider the influence of process variables such as changes in rolling process characteristics, changes in strip shape between passes, and the pressure of the strip impacting the side guide plate. This method has a certain degree of limitation and is prone to ineffective or erroneous adjustments. The patent "An Automatic Control Method and Device for the Sickle Bending of Medium and Heavy Plates" (patent number: 202211685050.9) proposes to construct a wedge-shaped model of the slab exiting the corresponding pass based on data such as the rolling mill reduction deviation, the rolling force deviation on both sides, and the strip width, thereby calculating the adjustment amount of the roll gap deviation for each pass. The patent "An Online Control Method for Sickle Bending Based on Mechanism Data Joint Drive" (patent number: 202211356045.3) automatically adjusts the roll gap deviation based on the predicted sckle bending model. Neither of these patents directly controls the actual slab sckle bending, making it difficult to improve the effectiveness of the adjustment. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned technologies and provide a method for replacing the original manual operation and realizing online automatic control of the roll gap deviation of the roughing reversible rolling mill.

[0005] To solve the above-mentioned technical problems, the technical solution proposed by this invention is: an automatic control method for roll gap deviation of a roughing R2 reversible rolling mill, comprising the following steps:

[0006] (1) Data collection:

[0007] The maximum offset 'a' of the head center of this steel block in the third pass of the R1 rolling mill. i The maximum offset 'a' of the head center of the upper steel block in the third pass of the R1 rolling mill. i-1 ;

[0008] The maximum offset x of the head center of this steel block in the first pass of the R2 rolling mill i The maximum offset y of the head center of this steel block in the third pass of the R2 rolling mill. i The maximum value of Z, the center offset of the tail section of the third pass of the R2 rolling mill for this steel block. i The maximum offset x of the head center of the upper steel block in the first pass of the R2 rolling mill i-1 The maximum offset y of the upper steel block at the head center of the third pass of the R2 rolling mill i-1 The maximum offset Z of the upper steel block at the tail center of the third pass of the R2 rolling mill. i-1 ;

[0009] The target width W of this steel block i Target width W of the lower steel block i+1 ;

[0010] The pressure value R of this steel block is detected by the pressure sensors on the guide plate drive side and working side of the first, second and third passes of the R2 rolling mill. 2-1传i R 2-1工i R 2-2传i R 2-2工i R 2-3传i R 2-3工i The pressure value detected by the pressure sensors on the guide plate drive side and working side of the first, second, and third passes of the R2 rolling mill is R. 2-1传i-1 R 2-1工i-1 R2- 2传i-1 R 2-2工i-1 R 2-3传i-1 R 2-3工i-1 ;

[0011] (2) Define n as the number of adjustment intervals, and n is a positive integer; when the R2 mill changes work rolls to start rolling or after calibration, n = 1; the number of adjustment intervals is adjusted before each piece of steel is fed into the R1 mill;

[0012] If any of the following conditions are met: the absolute value of the difference in width reduction between this steel block and the previous steel block is greater than 30mm, or the absolute value of the difference in the thickness of the intermediate billet between this steel block and the previous steel block is ≥4mm, or the absolute value of the difference in the target cold width between this steel block and the previous steel block is ≥300mm, then the adjustment interval number is increased by 1.

[0013] (3) Pre-adjustment based on the incoming plate shape of R1 mill: After the third pass of R1 mill throws out the steel and before the first pass of R2 mill feeds in, and there is no steel in the R2 mill area, adjustments are made to R2 mill:

[0014] (3a) Determine whether the adjustment interval numbers of this piece of steel and the previous piece of steel are the same. If yes, proceed to step (3b); otherwise, proceed to step (3d).

[0015] (3b) When a i x i-1 y i-1 Z i-1 All signs are the same, and the following conditions are met: Then proceed to step (3c); otherwise, the roll gap deviation of the R2 mill will not be adjusted and will continue to step (4);

[0016] (3c) Calculate the first roll gap deviation adjustment ΔR2difgap1 for the R2 mill:

[0017]

[0018] When ΔR2difgap1<0, and R 2-1工i-1 R 2-2工i-1 R 2-3工i-1 If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted;

[0019] When ΔR2difgap1>0, and R 2-1传i-1 R 2-2传i-1 R 2-3传i-1 If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted.

[0020] Otherwise, adjust the roll gap deviation of the R2 mill according to the first roll gap deviation adjustment amount ΔR2difgap1 and continue to step (4);

[0021] (3d) When |a i -a i-1 If |≥50mm, then proceed to step (3e); otherwise, the roll gap deviation of the R2 mill is not adjusted and proceeds to step (4).

[0022] (3e) Calculate the first roll gap deviation adjustment ΔR2difgap1 for the R2 mill:

[0023]

[0024] When ΔR2difgap1<0, and R 2-1工i-1 R 2-2工i-1 R 2-3工i-1 If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted.

[0025] When ΔR2difgap1>0, and R 2-1传i-1 R 2-2传i-1 R 2-3传i-1If any of the values ​​is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted.

[0026] Otherwise, adjust the roll gap deviation of the R2 mill according to the first roll gap deviation adjustment amount ΔR2difgap1 and continue to step (4);

[0027] (4) Adjustment of plate shape between R2 passes: After the steel block is ejected in the first pass of the R2 mill, and the adjustment interval of the upper steel block is the same as that of the steel block, the R2 mill is adjusted accordingly.

[0028] (4a) If it is the first piece of steel in the same adjustment interval, the roll gap deviation of the R2 mill is not adjusted and continues to step (5); if it is not the first piece of steel in the same adjustment interval, and x i y i-1 Z i-1 The signs are all the same, and |x i |≥35mm or|y i-1 If the roll gap deviation of the R2 mill is ≥35mm, proceed to step (4b); otherwise, do not adjust the roll gap deviation and continue to step (5).

[0029] (4b) Calculate the second roll gap deviation adjustment ΔR2difgap2 for the R2 mill:

[0030]

[0031] When ΔR2difgap2<0, and R 2-1工i-1 R 2-2工i-1 R 2-3工i-1 R 2-1工i If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted;

[0032] When ΔR2difgap2>0, and R 2-1传i-1 R 2-2传i-1 R 2-3传i-1 R 2-1传i If any of the values ​​is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted.

[0033] Otherwise, adjust the roll gap deviation of the R2 mill according to the second roll gap deviation adjustment amount ΔR2difgap2 and continue to step (5);

[0034] (5) Adjustment based on the shape of adjacent strips: After the third pass of the R2 mill, and if the adjustment intervals of this strip and the next strip are the same, the R2 mill is adjusted accordingly.

[0035] (5a) If it is the first piece of steel in the same adjustment interval, the roll gap deviation of the R2 mill is not adjusted and the process ends; if it is not the first piece of steel in the same adjustment interval, and x i yi Z i The signs are all the same, and |x i |≥35mm or|y i If the gap is ≥35mm, proceed to step (5b); otherwise, the roll gap deviation of the R2 mill will not be adjusted and the adjustment will end.

[0036] (5b) Calculate the third roll gap deviation adjustment ΔR2difgap3 for the R2 mill:

[0037]

[0038] When ΔR2difgap3<0, and R 2-1工i R 2-2工i R 2-3工i If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted;

[0039] When ΔR2difgap3>0, and R 2-1传i R 2-2传i R 2-3传i If any value is greater than 0.5 tons, then the roll gap deviation of the R2 mill will not be adjusted.

[0040] Otherwise, adjust the roll gap deviation of the R2 mill according to the third roll gap deviation adjustment amount ΔR2difgap3.

[0041] This invention provides an online automatic control method for roll gap deviation in a roughing reversible R2 rolling mill. Taking the work roll changing unit of the R2 roughing mill as a whole, it constructs adjustment intervals (i.e., strips with similar strip width, width reduction, and intermediate slab thickness), and collects actual data on the center offset of the slab head and tail in each pass, as well as pressure data from the side guide plates on both sides of each pass. It comprehensively considers and adjusts these factors based on the incoming strip shape, the strip shape between passes, and the shape of adjacent strips, achieving automatic control of roll gap deviation in the roughing reversible rolling mill. Compared to the previous method of manually adjusting the strip's camber by visually monitoring video, this invention can control the camber more accurately, quantitatively, and promptly, freeing operators from heavy and repetitive labor, while improving the camber control accuracy by approximately 10%. Detailed Implementation

[0042] Example: The automatic control method for roll gap deviation of the R2 reversible roughing mill in this example includes the following steps:

[0043] (1) Data collection:

[0044] The maximum offset 'a' of the head center of this steel block in the third pass of the R1 rolling mill. i The maximum offset 'a' of the head center of the upper steel block in the third pass of the R1 rolling mill. i-1 ;

[0045] The maximum offset x of the head center of this steel block in the first pass of the R2 rolling mill i The maximum offset y of the head center of this steel block in the third pass of the R2 rolling mill. i The maximum value of Z, the center offset of the tail section of the third pass of the R2 rolling mill for this steel block. i The maximum offset x of the head center of the upper steel block in the first pass of the R2 rolling mill i-1 The maximum offset y of the upper steel block at the head center of the third pass of the R2 rolling mill i-1 The maximum offset Z of the upper steel block at the tail center of the third pass of the R2 rolling mill. i-1 ;

[0046] The target width W of this steel block i Target width W of the lower steel block i+1 ;

[0047] The pressure value R of this steel block is detected by the pressure sensors on the guide plate drive side and working side of the first, second and third passes of the R2 rolling mill. 2-1传i R 2-1工i R 2-2传i R 2-2工i R 2-3传i R 2-3工i The pressure value detected by the pressure sensors on the guide plate drive side and working side of the first, second, and third passes of the R2 rolling mill is R. 2-1传i-1 R 2-1工i-1 R 2-2传i-1 R 2-2工i-1 R 2-3传i-1 R 2-3工i-1 ;

[0048] (2) Define n as the number of adjustment intervals, and n is a positive integer; when the R2 mill changes work rolls to start rolling or after calibration, n = 1; the number of adjustment intervals is adjusted before each piece of steel is fed into the R1 mill;

[0049] When any of the following conditions are met: the absolute value of the difference in width reduction between the current strip and the previous strip is greater than 30mm, or the absolute value of the difference in intermediate billet thickness between the current strip and the previous strip is ≥4mm, or the absolute value of the difference in target cold-cut width between the current strip and the previous strip is ≥300mm, the adjustment interval number is incremented by 1. If the adjustment interval numbers of adjacent strips are the same, it indicates that the camber control characteristics or patterns of the adjacent strips are similar.

[0050] (3) Pre-adjustment based on the incoming plate shape of R1 mill: After the third pass of R1 mill throws out the steel and before the first pass of R2 mill feeds in, and there is no steel in the R2 mill area, the R2 mill is adjusted. This is mainly to eliminate or reduce the impact of changes in the incoming plate shape of R1 on the control accuracy of the R2 camber curve.

[0051] (3a) Determine whether the adjustment interval numbers of this piece of steel and the previous piece of steel are the same. If yes, proceed to step (3b); otherwise, proceed to step (3d).

[0052] (3b) When a i x i-1 y i-1 Z i-1 All signs are the same, and the following conditions are met: Then proceed to step (3c); otherwise, the roll gap deviation of the R2 mill will not be adjusted and will continue to step (4);

[0053] (3c) Calculate the first roll gap deviation adjustment ΔR2difgap1 for the R2 mill:

[0054]

[0055] When ΔR2difgap1<0, and R 2-1工i-1 R 2-2工i-1 R 2-3工i-1 If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted;

[0056] When θR2difgap1>0, and R 2-1传i-1 R 2-2传i-1 R 2-3传i-1 If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted.

[0057] Otherwise, adjust the roll gap deviation of the R2 mill according to the first roll gap deviation adjustment amount ΔR2difgap1 and continue to step (4);

[0058] (3d) When |a i -a i-1 If |≥50mm, then proceed to step (3e); otherwise, the roll gap deviation of the R2 mill is not adjusted and proceeds to step (4).

[0059] (3e) Calculate the first roll gap deviation adjustment ΔR2difgap1 for the R2 mill:

[0060]

[0061] When ΔR2difgap1<0, and R 2-1工i-1 R 2-2工i-1 R 2-3工i-1 If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted.

[0062] When ΔR2difgap1>0, and R 2-1传i-1 R 2-2传i-1 R 2-3传i-1If any of the values ​​is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted.

[0063] Otherwise, adjust the roll gap deviation of the R2 mill according to the first roll gap deviation adjustment amount ΔR2difgap1 and continue to step (4);

[0064] (4) Adjustment of plate shape between R2 passes: After the steel block is discarded in the first pass of the R2 mill, and the adjustment interval of the previous steel block is the same as that of the current steel block, the R2 mill is adjusted. The plate shape adjustment between passes is mainly based on the actual plate shape of the intermediate passes that have been rolled, which can create conditions for good plate shape control in subsequent passes.

[0065] (4a) If it is the first piece of steel in the same adjustment interval, the roll gap deviation of the R2 mill is not adjusted and continues to step (5); if it is not the first piece of steel in the same adjustment interval, and x i y i-1 Z i-1 The signs are all the same, and |x i |≥35mm or|y i-1 If the roll gap deviation of the R2 mill is ≥35mm, proceed to step (4b); otherwise, do not adjust the roll gap deviation and continue to step (5).

[0066] (4b) Calculate the second roll gap deviation adjustment ΔR2difgap2 for the R2 mill:

[0067]

[0068] When ΔR2difgap2<0, and R 2-1工i-1 R 2-2工i-1 R 2-3工i-1 R 2-1工i If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted;

[0069] When ΔR2difgap2>0, and R 2-1传i-1 R 2-2传i-1 R 2-3传i-1 R 2-1传i If any of the values ​​is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted.

[0070] Otherwise, adjust the roll gap deviation of the R2 mill according to the second roll gap deviation adjustment amount ΔR2difgap2 and continue to step (5);

[0071] (5) Adjustment based on the shape of adjacent strips: After the third pass of the R2 mill, and if the adjustment intervals of this strip and the next strip are the same, the R2 mill is adjusted. The adjustment of the shape of adjacent strips is mainly based on the actual rolling shape control results of strips with similar camber control characteristics, so as to create favorable conditions for the shape control of the next strip.

[0072] (5a) If it is the first piece of steel in the same adjustment interval, the roll gap deviation of the R2 mill is not adjusted and the process ends; if it is not the first piece of steel in the same adjustment interval, and x i y i Z i The signs are all the same, and |x i |≥35mm or|y i If the gap is ≥35mm, proceed to step (5b); otherwise, the roll gap deviation of the R2 mill will not be adjusted and the adjustment will end.

[0073] (5b) Calculate the third roll gap deviation adjustment ΔR2difgap3 for the R2 mill:

[0074]

[0075] When ΔR2difgap3<0, and R 2-1工i R 2-2工i R 2-3工i If any value is greater than 0.5 tons, the roll gap deviation of the R2 mill will not be adjusted;

[0076] When θR2difgap3>0, and R 2-1传i R 2-2传i R 2-3传i If any value is greater than 0.5 tons, then the roll gap deviation of the R2 mill will not be adjusted.

[0077] Otherwise, adjust the roll gap deviation of the R2 mill according to the third roll gap deviation adjustment amount ΔR2difgap3.

[0078] This invention is not limited to the embodiments described above. All technical solutions formed by equivalent substitutions fall within the scope of protection claimed by this invention.

Claims

1. A method of automatically controlling a roll gap deviation of a rough rolling R2 reversible rolling mill, characterized by, Comprising the following steps: (1) Collecting data: Maximum value of the head center shift a of the steel in the third pass of the R1 rolling mill i Maximum value of the head center shift a of the steel in the third pass of the R1 rolling mill i-1 Maximum value of the head center shift a of the steel in the third pass of the R1 rolling mill Maximum value of the head center shift of the present slab at the first pass of the R2 rolling mill x i Maximum value of the head center shift of the present slab at the third pass of the R2 rolling mill y i Maximum value of the tail center shift of the present slab at the third pass of the R2 rolling mill Z i Maximum value of the head center shift of the preceding slab at the first pass of the R2 rolling mill x i-1 Maximum value of the head center shift of the preceding slab at the third pass of the R2 rolling mill y i-1 Maximum value of the tail center shift of the preceding slab at the third pass of the R2 rolling mill Z i-1 ; Target width W of the present slab i Target width W of the present slab i+1 Target width W of the present slab The pressure value R detected by the pressure sensor at the driving side and the working side of the first, second and third pass exit side guide plate of the R2 rolling mill 2-1传i , R 2-1工i , R 2-2传i , R 2-2工i , R 2-3传i , R 2-3工i The pressure value R detected by the pressure sensor at the driving side and the working side of the first, second and third pass exit side guide plate of the R2 rolling mill 2-1传i-1 , R 2-1工i-1 , R 2-2传i-1 , R 2-2工i-1 , R 2-3传i-1 , R 2-3工i-1 ; (2) Defining n as the number of adjustment intervals, and n is a positive integer; when the R2 rolling mill changes the work roll for opening or calibration, n = 1; before each steel enters the R1 rolling mill, the number of adjustment intervals is adjusted; When any of the following conditions is met: the absolute value of the width reduction difference between the current steel and the previous steel is greater than 30 mm, or the absolute value of the intermediate slab thickness difference between the current steel and the previous steel is greater than 4 mm, or the absolute value of the target cold width difference between the current steel and the previous steel is greater than 300 mm; then the number of adjustment intervals is increased by 1; (3) Pre-adjustment according to the incoming shape of the R1 rolling mill: after the third pass of the current steel in the R1 rolling mill and before the first pass of the R2 rolling mill, and there is no steel in the R2 rolling mill area, the R2 rolling mill is adjusted: (3a) Determine whether the number of adjustment intervals of the current steel and the previous steel is the same, if yes, execute step (3b); otherwise execute step (3d); (3b) when a i , x i-1 , y i-1 , Z i-1 of the symbols are the same, and the condition: Step (3c) is performed; otherwise the roll gap deviation of the R2 rolling mill is not adjusted and the process continues to Step (4). (3c) Calculate the first roll gap deviation adjustment amount ΔR2difgap1 of the R2 rolling mill: When ΔR2difgap1 < 0, and R 2-1工i-1 , R 2-2工i-1 , R 2-3工i-1 is greater than 0.5 tons, the roll gap of the R2 mill is not adjusted. When ΔR2difgap1> 0, and R 2-1传i-1 , R 2-2传i-1 , R 2-3传i-1 any of the values is greater than 0.5 tons, the roll gap of the R2 mill is not adjusted. Otherwise, adjust the roll gap deviation of the R2 rolling mill according to the first roll gap deviation adjustment amount ΔR2difgap1 and continue to step (4); (3d) when |a i - a i-1 | > 50 mm, then step (3e) is performed, otherwise, the roll gap deviation of the R2 rolling mill is not adjusted and the process continues to step (4). (3e) Calculate the first roll gap deviation adjustment amount ΔR2difgap1 of the R2 rolling mill: When ΔR2difgap1< 0, and R 2-1工i-1 , R 2-2工i-1 , R 2-3工i-1 where any of the values is greater than 0.5 tons, the roll gap of the R2 mill is not adjusted; When ΔR2difgap1> 0, and R 2-1传i-1 , R 2-2传i-1 , R 2-3传i-1 where any of the quantities is greater than 0.5 tons, the roll gap of the R2 mill is not adjusted; Otherwise, adjust the roll gap deviation of the R2 rolling mill according to the first roll gap deviation adjustment amount ΔR2difgap1 and continue to step (4); (4) Adjustment according to the shape between R2 passes: after the first pass of the current steel in the R2 rolling mill, and the number of adjustment intervals of the previous steel and the current steel is the same, the R2 rolling mill is adjusted: (4a) If the first piece of steel is of the same adjustment interval number, the roll gap deviation of the R2 rolling mill is not adjusted and continues to step (5); if the first piece of steel is not of the same adjustment interval number, and x i , y i-1 , and Z i-1 all have the same sign, and |x i |≥ 35 mm or |y i-1 |≥ 35 mm, step (4b) is performed; otherwise, the roll gap deviation of the R2 rolling mill is not adjusted and continues to step (5); (4b) Calculate the second roll gap deviation adjustment amount ΔR2difgap2 of the R2 rolling mill: When any of ΔR2difgap2< 0, and R 2-1工i-1 , R 2-2工i-1 , R 2-3工i-1 , R 2-1工i is greater than 0.5 tons, the roll gap of the R2 mill is not adjusted. When ΔR2difgap2> 0, and R 2-1传i-1 , R 2-2传i-1 , R 2-3传i-1 , R 2-1传i where any of the values is greater than 0.5 tons, the roll gap of the R2 mill is not adjusted; Otherwise, adjust the roll gap deviation of the R2 rolling mill according to the second roll gap deviation adjustment amount ΔR2difgap2 and continue to step (5); (5) Adjustment according to the shape of adjacent steels: after the third pass of the current steel in the R2 rolling mill, and the number of adjustment intervals of the current steel and the next steel is the same, the R2 rolling mill is adjusted: (5a) If the first piece of steel is of the same adjustment interval number, the roll gap deviation of the R2 rolling mill is not adjusted and ends; if the first piece of steel is not of the same adjustment interval number, and x i , y i , and Z i have the same sign, and |x i |≥35mm or |y i |≥35mm, step (5b) is performed; otherwise, the roll gap deviation of the R2 rolling mill is not adjusted and the adjustment ends; (5b) Calculate the third roll gap deviation adjustment amount ΔR2difgap3 of the R2 rolling mill: When ΔR2difgap3 < 0, and R 2-1工i , R 2-2工i , R 2-3工i is greater than 0.5 tons, the roll gap of the R2 mill is not adjusted. When ΔR2difgap3 > 0, and R 2-1传i , R 2-2传i , R 2-3传i any of the values is greater than 0.5 tons, the roll gap of the R2 mill is not adjusted. Otherwise, adjust the roll gap deviation of the R2 rolling mill according to the third roll gap deviation adjustment amount ΔR2difgap3.

Images