Finishing unit working method for optimizing unit configuration and process control to reduce belt head marks

Abstract

The invention relates to the technical field of finishing unit parameter calculation and adjustment, and particularly discloses a finishing unit working method for optimizing unit configuration and process control to reduce a strip head mark, after strip steel is uncoiled, a tension sensor collects head and tail tension data and transmits the data to a central controller; the strip steel enters a welding machine to be welded; the flexible guide roller group automatically adjusts an inclination angle according to the thickness of strip steel and disperses stress; the withdrawal and straightening machine carries out withdrawal and straightening operation; carrying out edge cutting operation by a shearing machine; shearing heads and tails by a crosscutting shear; the torque of the coiling machine is adjusted according to a preset algorithm, and a progressive tension curve is formed; according to the invention, through the overall equipment setting of the unit and the improvement of process control parameters, the belt head printing effect is well improved, and the surface quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of finishing unit parameter calculation and adjustment, and particularly relates to a finishing unit working method for optimizing unit configuration and process control to reduce head marks. BACKGROUND

[0002] The head mark is caused by the fact that the head of the cold-rolled strip steel has a certain thickness. Under the action of the coiling tension, stress concentration occurs at the head position, causing a horizontal line to be pressed out on the surface of the thick-gauge strip steel, resulting in a "head mark" defect, which affects the surface quality.

[0003] The traditional solution has limitations, and the existing technology relies on a positioning sleeve. The head positioning function is used at the outlet coiler to reduce the length of the head mark. The higher the positioning accuracy, the more obvious the improvement effect. In the existing technical solution, such as CN105436236B, the invention relates to a control method for improving the head mark of a cold-rolled sheet coiler. The actual position of the core shaft expansion and contraction is detected by a position encoder, but the removal effect of the head mark is not good in actual application. Therefore, it is necessary to design a finishing unit working method for optimizing unit configuration and process control to reduce head marks, which utilizes the configuration of the finishing unit equipment and specific process tension settings to solve the problem of head mark defects of the strip steel caused by the coiler of the existing continuous annealing and galvanizing main unit. SUMMARY

[0004] In view of the problems in the prior art, the purpose of the present application is to provide a finishing unit working method for optimizing unit configuration and process control to reduce head marks.

[0005] The technical scheme adopted by the present application to solve the technical problems is: a finishing unit working method for optimizing unit configuration and process control to reduce head marks, comprising the following steps:

[0006] S1, after the strip steel is unwound, the head and tail tension data are collected by a tension sensor and transmitted to a central controller;

[0007] S2, the strip steel enters a welding machine for welding;

[0008] S3, the flexible guide roller group automatically adjusts the inclination angle according to the thickness of the strip steel to disperse stress;

[0009] S4, a tension leveler performs tension leveling operation;

[0010] S5, a slitting machine performs edge cutting operation;

[0011] S6, a transverse cutting shear cuts the head and tail of the strip steel;

[0012] S7, the torque of the coiler is adjusted according to a preset algorithm to form a gradual tension curve.

[0013] Specific is, the tension sensor in the step S1 is installed at the entrance of the uncoiler of the finishing unit, and the tension gradient of the coiler and the uncoiler is dynamically adjusted in combination with the PLC algorithm, so as to form a progressive tension curve with low front and high back.

[0014] Specific is, the welding machine in the step S2 adopts a narrow lap resistance welding machine, the tail of the front coil strip steel and the head of the rear coil strip steel are cut by the welding machine transverse cutting shear, the thickness, shape and cross section quality of the strip steel before and after cutting are ensured, the welding parameters are set, then the tail of the front coil strip steel and the head of the rear coil strip steel are overlapped, the welding wheel rolls the overlapping place through the moving frame, and a high-strength welding seam is obtained, which is used for continuous production of the strip steel.

[0015] Specific is, the welding parameters: the welding current is 16-23 kA; the welding speed is 10-15 m / min; the welding wheel pressure is 20-25 kN; the welding lap amount is 0.9-1.8 mm; the welding compensation amount is 0.7-1.0 mm; the rolling pressure is low when the thickness of the strip steel is below 0.8 mm, and the rolling pressure is high when the thickness of the strip steel is above 0.8 mm.

[0016] Specific is, the inclination angle in the step S3 is in the range of:

[0017] When the thickness of the strip steel is greater than 1.0 mm, the inclination angle α is 2°-5°, and the stress dispersion coefficient is 0.8-1.2;

[0018] When the thickness of the strip steel is 0.5-1.0 mm, the inclination angle α is 1°-3°, and the stress dispersion coefficient is 0.6-1.0;

[0019] When the thickness of the strip steel is less than 0.5 mm, the inclination angle α is 0.5°-2°, and the stress dispersion coefficient is 0.4-0.8.

[0020] Specific is, the shear machine in the step S5 adopts a disc shear, and the disc shear is configured as follows: the blade material adopts high-speed tool steel HSS-E; the blade edge hardness is HRC 62-65; the blade side gap precision is ±0.01 mm; the side gap adjustment range is-0.02-0.5 mm; the overlapping amount precision is ±0.03 mm; and the overlapping amount adjustment range is-10-2 mm.

[0021] Specific is, the preset algorithm in the step S7 adopts a double closed loop fuzzy PID control model, and the working steps of the algorithm are as follows:

[0022] S71, input variables: real-time tension sensor data F x , F y , F z ; strip running speed V, unit m / min; roller group inclination angle feedback α;

[0023] S72, output variable: hydraulic servo cylinder displacement S, unit mm; roll group spacing adjustment amount Delta d, unit mm;

[0024] S73, control flow: read tension sensor data, calculate the current stress distribution index:

[0025] SDI = integral (F x ^2 + F y ^2 + F z ^2) Delta d / S;

[0026] According to the SDI value, the target inclination angle alpha_target is determined by querying the expert database; the PID parameters K p , K i , K d are calculated through the fuzzy rule base; the PWM signal is output to control the servo valve; the inclination error epsilon = alpha_actual-alpha_target is corrected in real time, and alpha_actual is the actual inclination value.

[0027] The present application has the following beneficial effects:

[0028] The optimization of the unit configuration and the process control reduce the finishing unit working method of the head print, through the improvement of the overall equipment setting and the process control parameter of the unit, the good improvement of the head print effect is obtained, the surface quality is improved, the head print depth is less than or equal to 1 mu m (the traditional process is 2-5 mu m), the automobile outer plate surface standard is met, and the length of the hand feeling head print is reduced to 30 meters or less. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is the overall structure schematic diagram of the finishing unit system for optimizing unit configuration and process control to reduce head print.

[0030] Figure 2 It is an enlarged view of the uncoiler in Figure 1 .

[0031] Figure 3 It is an enlarged view of the welding machine in Figure 1 .

[0032] Figure 4 It is an enlarged view of the drawing straightening machine in Figure 1 .

[0033] Figure 5 It is an enlarged view of the shearing machine in Figure 1 .

[0034] Figure 6 It is an enlarged view of the coiler in Figure 1 .

[0035] In the figure: 1-uncoiler; 2-tension sensor; 3-welder; 4-tension leveler; 5-guiding roller group; 6-shearing machine; 7-coiler. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be further clearly and completely explained in the following with reference to the accompanying drawings in the embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative labor fall within the scope of the present application.

[0037] As shown in the figure, the schematic diagram of the unit configuration is as follows: Figures 1-6

[0038] Inlet section: uncoiler 1→ tension sensor 2 array→ welder 3→ flexible guiding roller group 5→ tension leveler 4.

[0039] Outlet section: disc shearing machine→ slitting equipment→ coiler 7.

[0040] A working method of a finishing unit for optimizing unit configuration and process control to reduce strip head printing, comprising the following steps:

[0041] 1. After the strip steel is uncoiled, the head and tail tension data are collected by the tension sensor 2 and transmitted to the central controller; the tension sensor 2 is installed at the inlet of the uncoiler 1 of the finishing unit, and the tension gradient of the coiler 7 and the uncoiler 1 is dynamically adjusted in combination with the PLC algorithm to form a progressive tension curve with low front and high back, thereby avoiding stress mutation caused by traditional constant tension.

[0042] 2. The strip steel enters the welder 3 for welding.

[0043] The welder 3 adopts a narrow lap resistance welder, the tail of the front coil strip and the head of the rear coil strip are sheared by a transverse shearing machine, the thickness, shape and cross-section quality of the strip steel before and after shearing are ensured to be good, the welding parameters are set, then the tail of the front coil strip and the head of the rear coil strip are overlapped, the welding wheel passes through the moving frame to roll the overlapped place, thereby obtaining a high-strength weld for continuous production of the strip steel.

[0044] Welding parameters: welding current is 16-23 kA; welding speed is 10-15 m / min; welding wheel pressure is 20-25 kN; welding lap amount is 0.9-1.8 mm; welding compensation amount is 0.7-1.0 mm; the rolling pressure is low when the thickness of the strip steel is below 0.8 mm, and the rolling pressure is high when the thickness of the strip steel is above 0.8 mm.

[0045] 3. The flexible guiding roller group 5 automatically adjusts the inclination angle according to the thickness of the strip steel to disperse stress.

[0046] Inclination angle value range:

[0047] ​Strip thickness > 1.0mm: inclination angle a = 2°-5°, corresponding stress dispersion factor 0.8-1.2;

[0048] Strip thickness 0.5-1.0mm: inclination angle a = 1°-3°, stress dispersion factor 0.6-1.0;

[0049] Strip thickness <0.5mm: inclination angle a = 0.5°-2°, stress dispersion factor 0.4-0.8.

[0050] 4. The puller-straightener 4 performs the pull-straightening operation.

[0051] 5. The trimming shear 6 performs the trimming operation.

[0052] The trimming shear 6 adopts a disc shear, and the disc shear is configured as follows: the blade material adopts high-speed tool steel HSS-E; the blade edge hardness is HRC 62-65; the blade side gap precision is ±0.01mm; the side gap adjustment range is -0.02-0.5mm; the overlap precision is ±0.03mm; and the overlap adjustment range is -10-2mm.

[0053] 6. The cross-cut shear shears the strip head and tail.

[0054] 7. The preset algorithm is used to adjust the torque of the coiler 7 to form a gradual tension curve.

[0055] The preset algorithm adopts a double-closed-loop fuzzy PID control model, and the working steps of the algorithm are as follows:

[0056] 1) Input variables: real-time tension sensor data F x , F y , F z ; strip running speed V, unit m / min; roll group inclination angle feedback a.

[0057] 2) Output variables: hydraulic servo cylinder displacement S, unit mm; roll group spacing adjustment amount d, unit mm.

[0058] 3) Control process: read the tension sensor data, and calculate the current stress distribution index:

[0059] SDI = ∫(F x ^2+F y ^2+F z ^2) d / S;

[0060] According to the SDI value, the target inclination angle a_target is determined according to the expert database; and the PID parameters K p , K i , K dThe output PWM signal controls the servo valve; the real-time feedback corrects the tilt angle error ε = α_actual - α_target, and α_actual is the actual tilt angle value.

[0061] The calculated specific tension table is shown in Table 1.

[0062] Table 1: Specific tension table.

[0063]

[0064] Compared with the prior art, the length of the hand feeling head printing defect can be shortened to within 35 meters, meeting the quality requirements of high-end automobile plates. A hydraulic servo-driven wave-shaped guide roller group is arranged in front of the coiler 7, and the tilt angle and spacing are automatically adjusted according to the thickness and speed of the strip, so as to disperse the stress concentration at the head. In combination with the asymmetric micro-texture composite coating guide roller, the friction coefficient is reduced by 20%, thereby avoiding scratching.

[0065] Example 1:

[0066] The application will be further described in detail below in combination with specific examples.

[0067] Production steel grade: DC04.

[0068] Specification: 1.1*1400mm.

[0069] The tension table of Example 1 is shown in Table 2.

[0070] Table 2: Tension table of Example 1.

[0071]

[0072] When the steel coil is fed to the finishing unit, the unit is produced according to the tension setting as shown in the above table.

[0073] 1. After the strip is uncoiled, the tension sensor collects the head and tail tension data and transmits it to the central controller.

[0074] 2. The strip enters the welding machine for welding.

[0075] 3. The flexible guide roller group automatically adjusts the tilt angle according to the thickness of the strip to disperse the stress.

[0076] 4. The stretch leveler adopts a specific stretch leveler elongation of 0.3% for stretch leveler operation.

[0077] 5. The trimming machine performs edge trimming operation.

[0078] 6. The cross-cut shear shears the head and tail of the strip.

[0079] 7. Adjust the winding machine torque according to preset algorithm, form progressive tension curve, diameter 500-600mm, 1.2 tension coefficient, diameter 700-2300mm, 1.0 tension coefficient.

[0080] The present application is not limited to the above-mentioned embodiments, and any person should know that the structural changes made under the inspiration of the present application, any technical solution with the same or similar to the present application, falls within the scope of the present application.

[0081] The technology, shape, structure part not described in detail in the present application are all known technology.

Claims

1. A method for optimizing the configuration of a finishing group and the process control to reduce the head marks of a finishing group, characterized by, It comprises the following steps: S1, after the strip steel is unwound, the tension sensor collects head and tail tension data and transmits them to the central controller; S2, the strip steel enters the welding machine for welding; S3, the flexible guide roller group automatically adjusts the inclination angle according to the thickness of the strip steel to disperse stress; S4, the tension leveler performs tension leveling operation; S5, the trimming machine performs edge trimming operation; S6, the cross-cut shear shears the head and tail of the strip steel; S7, the preset algorithm adjusts the torque of the coiler to form a gradual tension curve.

2. The method of claim 1, wherein the finishing line is a paperboard finishing line. The tension sensor in the step S1 is installed at the entrance of the unwinder of the finishing unit, and the PLC algorithm dynamically adjusts the tension gradient of the coiler and the unwinder to form a gradual tension curve with low front and high back.

3. The method of claim 1, wherein the finishing line is a paperboard finishing line. The welding machine in the step S2 adopts a narrow lap resistance welding machine, the tail of the front coil strip steel and the head of the rear coil strip steel are sheared by the cross-cut shear, the thickness, shape and cross-section quality of the strip steel before and after shearing are good, the welding parameters are set, then the tail of the front coil strip steel and the head of the rear coil strip steel are overlapped, the welding wheel rolls through the moving frame to press the overlapped part to obtain a high-strength weld for continuous production of the strip steel.

4. The method of claim 3, wherein the finishing line is a paperboard finishing line. The welding parameters are as follows: welding current is 16-23kA; welding speed is 10-15m / min; welding wheel pressure is 20-25kN; welding lap amount is 0.9-1.8mm; welding compensation amount is 0.7-1.0mm; the rolling pressure is low when the strip steel thickness is below 0.8mm, and the rolling pressure is high when the strip steel thickness is above 0.8mm.

5. The method of claim 1, wherein the finishing line is a paperboard finishing line. The inclination angle in the step S3 is in the range of: When the strip steel thickness is greater than 1.0mm, the inclination angle α is 2°-5°, and the stress dispersion coefficient is 0.8-1.2; When the strip steel thickness is 0.5-1.0mm, the inclination angle α is 1°-3°, and the stress dispersion coefficient is 0.6-1.0; When the strip steel thickness is less than 0.5mm, the inclination angle α is 0.5°-2°, and the stress dispersion coefficient is 0.4-0.

8.

6. The method of claim 1, wherein the finishing line is a paperboard finishing line. The shear machine in the step S5 adopts a disc shear, and the disc shear is configured as follows: the blade material adopts high-speed tool steel HSS-E; the blade edge hardness is HRC62-65; the blade side gap precision is ±0.01mm; the side gap adjustment range is-0.02-0.5mm; the overlap precision is ±0.03mm; and the overlap adjustment range is-10-2mm.

7. The method of claim 1, wherein the finishing line is a paperboard finishing line. The preset algorithm in the step S7 adopts a double-closed-loop fuzzy PID control model, and the working steps of the algorithm are as follows: S71, input variable: real-time tension sensor data F x , F y , F z ; strip running speed V, unit m / min; roll group inclination feedback α; S72, output variables: hydraulic servo cylinder displacement S, unit mm; roller group spacing adjustment Δd, unit mm; S73, control flow: read the tension sensor data, calculate the current stress distribution index: SDI = ∫(F x ^2 + F y ^2 + F z ^2) Ad / S; According to the SDI value, the target inclination angle α_target is determined by consulting the expert database, and the PID parameters K, P and D are calculated by the fuzzy rule database p , K i , K d ; the PWM signal is outputted to control the servo valve; and the inclination angle error ε = α_actual - α_target is corrected in real time, wherein α_actual is the actual inclination angle value.

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