A method for detecting and improving the accuracy of a finish rolling mill

Abstract

The application relates to the technical field of steel metallurgy finishing rolling mills, and particularly discloses a finishing mill precision detection and improvement method, which utilizes the power of an upper supporting roller balancing device to lift the upper supporting roller to be pressed on an upper step pad base plate and a step pad, measures and calculates the horizontal height of two ends of the supporting roller, and determines the wear and corrosion of the part above the upper supporting roller; the elevations of a portal bottom surface, a lower step pad upper surface and a lower supporting roller upper surface are measured respectively, and the wear and corrosion of the part below the lower working roller are determined; the finishing mill precision detection and improvement method designed by the application does not need to be disassembled and measured offline in a large number of devices, can be implemented during the time of regular maintenance, saves a large amount of time, can accurately determine the positions where the vertical direction deviation of the rolling mill is generated online, and takes different temporary treatment measures according to different positions, improves the precision of the rolling mill, and controls the precision of the rolling mill within the range required on site.

Description

Technical Field

[0001] This invention relates to the field of finishing mill technology in iron and steel metallurgy, and specifically to a method for precision detection and improvement of finishing mills. Background Technology

[0002] The finishing mill is a crucial piece of equipment in a hot strip rolling production line. It rolls the intermediate slabs produced by the roughing mill into the final thin strip steel and then transports the strip to the coiler. Located between the roughing mill and the coiler, it is a key step in the hot strip rolling production line. A finishing mill consists of seven similar finishing mills connected in series, such as... Figure 1 As shown, each finishing mill mainly includes a mill stand 1, upper support roll 5, upper work roll 6, lower work roll 7, lower support roll 8, upper support roll balancing device, two AGC hydraulic cylinders 3, upper step pad device 2, and lower step pad device 4. The upper step pad device 2, AGC hydraulic cylinders 3, upper support roll 5, upper work roll 6, lower work roll 7, lower support roll 8, and lower step pad device 4 are arranged vertically from top to bottom. The function of the roll system is to reduce the thickness of the intermediate billet by pressing down the upper support roll and upper work roll. The function of the AGC hydraulic cylinder is to adjust the roll gap and provide the power for pressing down the upper support roll and upper work roll. The gap between the upper and lower work rolls is called the roll gap. The function of the upper step pad device is to compensate for roll diameter deviations, ensure that the roll gap meets the set requirements, and serve as an auxiliary tool for replacing the AGC hydraulic cylinder and upper support roll. The function of the lower step pad device is to compensate for roll diameter deviations and ensure the rolling elevation.

[0003] During the calibration process after replacing the work rolls on the rolling mill, the varying degrees of wear and corrosion on the equipment in the vertical direction can cause excessive deviation in the AGC hydraulic cylinders on both sides, leading to calibration failure and affecting rolling stability. To solve this problem, it is necessary to accurately determine the degree of corrosion and wear on each piece of equipment in the vertical direction in order to take effective measures to control the deviation within a reasonable range.

[0004] In summary, all components exhibit wear and corrosion in the vertical direction. The complex and compact structure of the equipment in the vertical direction makes it impossible to measure the corrosion and wear of each component online, and the cause of the roll gap deviation on both sides cannot be accurately determined on-site. Disassembling each component for individual measurement is labor-intensive and time-consuming, failing to meet the actual needs of on-site production. Therefore, there is an urgent need to design a method for precision inspection and improvement of finishing mills to solve the problems of high difficulty, low efficiency, and inability to adjust the roll gap deviation on both sides of existing finishing mills in a timely manner. Summary of the Invention

[0005] In order to address the problems existing in the prior art and reduce the downtime of the rolling mill, the present invention aims to provide a method for precision detection and improvement of finishing mills.

[0006] The technical scheme adopted by the present application to solve its technical problems is: a finishing mill precision detection and improvement method, comprising the following steps:

[0007] S1, the upper work roll, the lower work roll, the lower support roll and the lower step pad device are drawn out, the horizontal elevation of the operating side and the driving side of the mill housing bottom surface is measured, and the elevation deviation S1 is calculated;

[0008] S2, the lower step pad device is loaded, the horizontal elevation of the corresponding positions of the operating side and the driving side is measured, and the elevation deviation S2 is calculated;

[0009] S3, the lower support roll is loaded, the horizontal elevation of both sides of the lower support roll is measured, and the elevation deviation S3 at the center of the roll bearing seat is calculated;

[0010] S4, the upper step pad is adjusted to the 2nd position, the upper support roll balance lifts the upper support roll, and a safety support block is placed between the upper support roll and the upper support roll balance;

[0011] S5, the upper support roll balance continuously outputs the balance force, the elevations of the corresponding positions of the operating side and the driving side of the lower surface of the upper support roll are measured, and the elevation deviation S 41 at the center line of the upper support roll bearing seat is calculated;

[0012] S6, the upper step pad is adjusted to the 3rd, 4th and 5th positions respectively, the steps S4 and S5 are repeated, the elevations of the corresponding positions of the operating side and the driving side of the lower surface of the upper support roll at different gears are measured, and the elevation deviations S 42 , S 43 , and S 44 at the center line of the upper support roll bearing seat are calculated.

[0013] S7, the height difference between the operating side and the driving side is determined according to the elevation deviation;

[0014] S8, the precision adjustment and improvement method of the finishing mill is formulated according to the elevation deviation.

[0015] The horizontal elevations of the operating side and the driving side of the mill housing bottom surface in the step S1 are measured respectively at four points, the elevations of the four points on the driving side are L D1 , L D2 , L D3 , and L D4 , the average value of the elevations on the driving side is calculated, L D =( L D1 +L D2 +L D3 +L D4 ) / 4; the elevations of the four points on the operating side are L O1 , L O2 , L O3 , and L O4 , the average value of the elevations on the driving side is calculated, L O =( LO1 +L O2 +L O3 +L O4 ) / 4, the elevation deviation S1=L O -L D .

[0016] The step S2, the horizontal elevation of both sides is measured respectively, the two points of the transmission side, the elevation H D1 , H D2 , the average value of the transmission side elevation H D = (H D1 +H D2 ) / 2 is calculated; the two points of the operation side, the elevation H O1 , H O2 , the average value of the transmission side elevation H O = (H O1 +H O2 ) / 2 is calculated, and the elevation deviation S2=H O -H D .

[0017] The step S3, the horizontal elevation of both sides of the lower support roller is measured respectively, the transmission side elevation M O and the operation side M D of the roller surface, the elevation deviation S3=M O -M D , and the elevation deviation S3 of the center of the roller bearing seat is calculated.

[0018] The step S5, the transmission side elevation N D1 and the operation side elevation N O1 of the lower surface of the upper support roller are measured, the elevation deviation S 41 =N O1 -N D1 , and the elevation deviation S 41 of the center line of the upper support roller bearing seat is calculated.

[0019] The step S7, when the elevation deviation S Z >0, the operation side is higher than the transmission side; when S Z <0, the operation side is lower than the transmission side; when S Z =0, the operation side is consistent with the transmission side in height.

[0020] The step S8, the precision adjustment method of the finishing mill, comprises the following steps:

[0021] D1: when the elevation deviation S1≥0.5mm, the adjustment is carried out by machining the track lining plate;

[0022] D2: when the elevation deviation S1<0.5mm and S2≥1mm, the adjustment is carried out by replacing the lower step pad;

[0023] D3: when the elevation deviation S2<1mm and S3≥1.5mm, the lower support roller is adjusted horizontally by adjusting the thickness of the arc-shaped pad plate;

[0024] D4: when the elevation deviation S 41 ≥0.5mm, the upper support roller pad plate is adjusted by machining;

[0025] D5: when the elevation deviation S 41 <0.5mm and S 42 or S 43 or S 44 ≥1mm, the corresponding upper step pad pad plate is replaced.

[0026] The present application has the following beneficial effects:

[0027] The precision detection and improvement method of the finishing mill designed by the present application does not need to disassemble a large number of equipment and measure offline, can be implemented during the repair time, saves a large amount of time, can accurately determine the position of the vertical direction deviation of the rolling mill online, and takes different temporary measures according to different positions, improves the precision of the rolling mill, and controls the precision of the rolling mill within the range required on site. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a vertical arrangement diagram of the finishing mill unit.

[0029] Figure 2 is a schematic diagram of the measurement position of the mill housing bottom surface.

[0030] Figure 3 is a flowchart of the precision detection and improvement method of the finishing mill.

[0031] In the figure: 1-rolling mill housing; 2-upper step pad device; 3-AGC hydraulic cylinder; 4-lower step pad device; 5-upper support roller; 6-upper work roller; 7-lower work roller; 8-lower support roller; 9-transmission side measurement position; 10-operation side measurement position; 11-housing bottom surface; 12-operation side housing; 13-transmission side housing. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be further described in detail below with reference to the accompanying drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0033] For example, Figures 2-3As shown, a kind of finishing mill precision detection and promotion method, using the power of upper support roll balancing device, the upper support roll is lifted and is pressed on the upper step pad pad plate and step pad, the horizontal height of the support roll two ends is measured and calculated, the wear and corrosion of the upper part of the upper support roll are determined;The elevation of the bottom surface of the frame, the upper surface of the lower step pad and the upper surface of the lower support roll is measured respectively, and the wear and corrosion of the lower part of the lower work roll are determined.The steps include:

[0034] S1, the upper work roll 6, the lower work roll 7, the lower support roll 8 and the lower step pad device 4 are extracted, the horizontal elevation of the operating side and the driving side of the frame bottom surface is measured, and the four points (such as Figure 2 As shown), the four point elevations of the driving side are L D1 , L D2 , L D3 , L D4 , the average value of the driving side elevation is calculated, L D =( L D1 +L D2 +L D3 +L D4 ) / 4;The four point elevations of the operating side are L O1 , L O2 , L O3 , L O4 , the average value of the driving side elevation is calculated, L O =( L O1 +L O2 +L O3 +L O4 ) / 4, and the elevation deviation S1=L O -L D .

[0035] S2, the lower step pad device 4 is loaded, and the horizontal elevation of the corresponding positions on both sides is measured.Two points are measured respectively, the two point elevations of the driving side H D1 , H D2 , the average value of the driving side elevation is calculated as H D =(H D1 +H D2 ) / 2;The two point elevations of the operating side H O1 , H O2 , the average value of the driving side elevation is calculated as H O =(H O1 +H O2 ) / 2, and the elevation deviation S2=H O -H D .

[0036] S3, the lower support roll 8 is loaded, and the horizontal elevation of the lower support roll 8 on both sides is measured.The horizontal elevations of the lower support roll 8 on both sides are measured as the driving side roll surface elevation M O and the operating side M D, the elevation deviation S3 at the center of the roll bearing seat is calculated. O -M D , the elevation deviation S3 at the center of the roll bearing seat is calculated.

[0037] S4, the upper step pad device 2 is adjusted to the second gear position, the upper support roller balance raises the upper support roller 5, and the safety support block is placed between the upper support roller 5 and the upper support roller balance to prevent the support roller from falling down during the measurement process.

[0038] S5, the upper support roller balance continuously outputs the balance force to ensure that the upper support roller 5, the AGC hydraulic cylinder 3, the step pad, and the pressure plate are tightly attached, and the elevation N D1 , the operation side elevation N O1 , the elevation deviation S 41 =N O1 -N D1 , the elevation deviation S 41 at the center line of the upper support roller bearing seat is calculated.

[0039] S6, the upper step pad device 2 is adjusted to the third, fourth, and fifth gear positions respectively, and the steps S4 and S5 are repeated. N D2 , N O2 , S 42 , N D3 , N O3 , S 43 , N D4 , N O4 , S 44 are measured and calculated respectively.

[0040] When the elevation deviation S Z is greater than 0, the operation side is higher than the transmission side; when the elevation deviation S Z is less than 0, the operation side is lower than the transmission side; and when the elevation deviation S Z is equal to 0, the operation side is consistent with the transmission side in height. The obtained Z (1, 2, 3, 4, 1, 2, 3, 4, 4).

[0041] After the upper support roller 5 is lifted, the support block is placed as a safety protection facility to avoid the measurement personnel being injured due to the lowering of the upper support roller 5 caused by gravity.

[0042] The deviation S1 indicates the deviation between the transmission side and the operation side of the lower step pad track surface; S2-S1 indicates the deviation between the transmission side and the operation side of the lower step pad device 4; and S3-S2 indicates the deviation between the transmission side and the operation side of the lower support roller 8 bearing seat.

[0043] The deviation S 41 indicates the deviation between the transmission side and the operation side of the pavilion top surface; S 42 -S 41 , S 43-S 41 , S 44 -S 41 respectively indicate the deviation of the 3rd, 4th and 5th step pad driving side and operation side.

[0044] Measurement result processing measures:

[0045] D1: when the elevation deviation S1 is greater than or equal to 0.5mm, the track lining plate is adjusted by machining adjustment;

[0046] D2: when the elevation deviation S1 is less than 0.5mm and S2 is greater than or equal to 1mm, the lower step pad is adjusted by replacement;

[0047] D3: when the elevation deviation S2 is less than 1mm and S3 is greater than or equal to 1.5mm, the lower support roller is adjusted by machining adjustment of the thickness of the arc-shaped pad plate;

[0048] D4: when the elevation deviation S 41 is greater than or equal to 0.5mm, the upper support roller pad plate is adjusted by machining adjustment;

[0049] D5: when the elevation deviation S 41 is less than 0.5mm and S 42 or S 43 or S 44 is greater than or equal to 1mm, the corresponding upper step pad pad plate is adjusted by replacement.

[0050] The present application is not limited to the above-mentioned embodiments, and anyone should know that the structural changes made under the inspiration of the present application, any technical solutions with the same or similar to the present application, fall within the protection scope of the present application.

[0051] The technical, shape and structure parts not described in detail in the present application are all known technologies.

Claims

1. A method of precision detection and improvement of a finishing mill, characterized by, Comprising the following steps: S1, draw out the upper work roll, the lower work roll, the lower support roll, the lower step pad device, measure the horizontal elevation of the mill housing bottom surface operation side and the driving side, the horizontal elevation of the mill housing bottom surface operation side and the driving side is measured respectively at four points, the four elevation of the driving side is respectively L D1 , L D2 , L D3 , L D4 , the average value of the elevation of the driving side is calculated, L D =( L D1 +L D2 +L D3 +L D4 ) / 4; the four elevation of the operation side is respectively L O1 , L O2 , L O3 , L O4 , the average value of the elevation of the driving side is calculated, L O =( L O1 +L O2 +L O3 +L O4 ) / 4, the elevation deviation S1 is calculated as L O -L D ; S2, load into the lower step pad device, measure the operating side, the corresponding position of the transmission side, the horizontal height, the horizontal height of both sides of the two points, the transmission side of the two points of the height H D1 、 D2 , the average height of the transmission side is H D = (H D1 +H D2 ) / 2; the operating side of the two points of the height H O1 、 O2 , the average height of the transmission side is H O = (H O1 +H O2 ) / 2, the height deviation S2=H O -H D ; S3, load the lower supporting roller, measure the horizontal elevation of the two sides of the lower supporting roller, and measure the driving side elevation M of the roller surface O and the operating side M D , the elevation deviation S3=M O -M D of the two sides, and calculate the elevation deviation S3 at the center of the roller bearing seat. S4, the upper step pad is adjusted to the 2nd position, the upper support roller balance is used to lift the upper support roller, and a safety support block is placed between the upper support roller and the upper support roller balance; S5, the upper support roller balance continues to output balance force, measures the upper support roller lower surface operating side, transmission side corresponding position elevation, calculates the elevation deviation S of the upper support roller bearing seat center line 41 ; S6, respectively, adjust the upper step pad to 3, 4, 5 gear position, repeat S4, S5 steps, measure the different gear position upper support roller lower surface operating side, transmission side corresponding position elevation, calculate the elevation deviation S of the upper support roller bearing seat center line 42 , S 43 , S 44 ; S7, the height difference between the operation side and the transmission side is determined according to the elevation deviation; S8, the precision adjustment lifting method of the finishing mill is formulated according to the elevation deviation, comprising the following steps: D1: when the elevation deviation S1 is greater than or equal to 0.5 mm, the track lining plate is adjusted by machining adjustment; D2: when the elevation deviation S1 is less than 0.5 mm and S2 is greater than or equal to 1 mm, the lower step pad is adjusted by replacement; D3: when the elevation deviation S2 is less than 1 mm and S3 is greater than or equal to 1.5 mm, the lower support roller is adjusted by machining the thickness of the arc-shaped pad plate. D4: elevation deviation S 41 ≥ 0.5 mm, adjust the upper support roller pad by machining adjustment; D5: elevation deviation S 41 <0.5mm and S 42 or S 43 or S 44 ≥1mm, adjust by replacing the corresponding upper step pad plate.

2. The finishing mill accuracy detection and improvement method of claim 1, wherein, The measurement of the upper supporting roller lower surface driving side elevation N in the step S5 D1 , the operation side elevation N O1 , the both side elevation deviation S 41 = N O1 -N D1 , the elevation deviation S at the center line of the upper supporting roller bearing seat is calculated 41 .

3. The finishing mill accuracy detection and improvement method of claim 1, wherein, The height deviation S in the step S7 Z > 0, the operation side is higher than the transmission side; S Z < 0, the operation side is lower than the transmission side; S Z = 0, the operation side is consistent with the transmission side.

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