CN114850212A - Method for eliminating roll mark defect on surface of strip steel in cold rolling process - Google Patents
Method for eliminating roll mark defect on surface of strip steel in cold rolling process Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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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
- B21B37/16—Control of thickness, width, diameter or other transverse dimensions
- B21B37/18—Automatic gauge control
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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
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/221—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by cold-rolling
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a method for eliminating rolling mark defects on the surface of strip steel in a cold rolling process, relates to the technical field of metal material processing, and solves the technical problems of quality defects, product value reduction and production cost increase caused by the fact that products with the rolling mark defects are produced in a cold rolling mode in the related technology. The method comprises the steps of performing off-line rechecking on a cold-hard coil to find a roll mark defect, determining a coil to be rolled with the defect, moving the coil to a rolling mill coiler, and performing centering operation and threading operation; searching early-stage rolling data of the defective coil to be rolled, and performing pre-adjustment; according to the preset start parameter, trial rolling the first length, and performing secondary adjustment on the rolling data; and then carrying out formal start-up rolling. By carrying out N +1 pass rolling on the strip steel, partial roll mark defects can be eliminated by secondary rolling of a rolling mill, so that the problem of reduction of strip output caused by degradation or waste judgment due to more roll mark defects can be solved, the product quality is ensured, the added value of the product is improved, and the cost and the economic loss are reduced.
Description
Technical Field
The invention relates to the technical field of metal material processing, in particular to a method for eliminating roll mark defects on the surface of strip steel in a cold rolling process.
Background
Silicon steel, also known as electrical steel, is required to have excellent magnetic properties and good surface quality. The roll mark defect is one of surface quality defects, and is formed by continuously or periodically distributed convex or concave marks (generally called roll mark defects) on the surface of strip steel in the rolling process of a finished product pass due to roll cracks (meat falling) of a rolling mill, poor roll grinding quality, roll scratches or scratches, punch damage of roll caused by impurities (silicon mud) dropping in a machine frame, punch damage of roll caused by raw material defects (holes and tilted skins) and the like. The produced product with the roll mark defect can not meet the surface quality standard, and then the quality is degraded or judged to be waste, so that the use value of the product is reduced, the manufacturing cost of the product is also improved, and the roll mark defect needs to be eliminated urgently.
Disclosure of Invention
The application provides a method for eliminating the rolling mark defect on the surface of strip steel in the cold rolling process, and solves the technical problems of quality defect, product value reduction and production cost increase caused by the cold rolling production of products with the rolling mark defect in the related technology.
The application provides a method for eliminating roll mark defects on the surface of strip steel in a cold rolling process, which comprises the following steps: the cold-hard coil is subjected to off-line recheck to find the roll mark defect, and a coil to be rolled with the defect is determined; moving the defective coil to be rolled to a rolling mill coiler, and performing centering operation and threading operation; searching early-stage rolling data of the to-be-rolled defect coil, and pre-adjusting coiling parameters of the to-be-rolled defect coil on line; rolling the coil to be rolled with the defect by a first length according to the preset start parameter, and adjusting the rolling data for the second time according to the plate shape state after the rolling test; and according to the rolling data after the second adjustment, formally starting and rolling the coil with the defects to be rolled so as to obtain a taken-out product without the roll mark defects.
Optionally, the formal start-up rolling of the defective coil to be rolled further includes:
formally starting the rolling mill to roll for a second length and then stopping the rolling mill to check the surface quality of the rolled strip steel;
the strip steel plate shape strategy control of the defective coil to be rolled during formal start-up rolling comprises plate shape process control and thickness control; the strip shape process control comprises controlling the wave shape of the edge of the strip steel according to the edge coverage rate of the strip steel, controlling the edge of two sides to be 35-45I-U when the edge coverage rate is more than or equal to 50%, and controlling the edge of two sides to be 20-30I-U when the edge coverage rate is less than 50%; the thickness control includes checking the compensation coefficient of the thickness gauge alloy.
Optionally, the defective coil to be rolled is subjected to a threading operation, including:
and reserving the previous finished coil in a rolling mill before threading, and lapping the strip head of the strip steel of the defective coil to be rolled on the strip steel of the previous finished coil.
Optionally, after the strip head of the strip steel of the defective roll to be rolled is threaded to the outlet guide roll, the lower wire of the last finished product roll is unloaded, and a thick-wall sleeve is additionally arranged on the outlet coiling machine, wherein the thickness of the thick-wall sleeve is larger than that of the strip steel of the defective roll to be rolled.
Optionally, the upfront rolling data comprises: the number, the type, the thickness and the width of a steel coil to be rolled, a roll shifting value of a middle roll, a leveling value and an ASU (automatic gauge Unit) convexity value of a defective coil;
pre-adjusting the coiling parameters of the on-line to-be-rolled defect coiling machine, comprising the following steps of: according to the steel grade and specification of the defective coil to be rolled, the rolling force, the front and rear tension values, the roll shifting value of a middle roll, the ASU convexity preset value, the emulsion control mode and the emulsion jet flow data are pre-adjusted.
Optionally, pre-adjusting a roll shifting value of a middle roll, including respectively reducing 5-10 on both sides according to a final roll shifting value after the last rolling so as to start rolling;
the pre-adjustment of the ASU convexity preset value comprises the following steps: the width W of the strip steel of the defective roll to be rolled is not less than 800mm and not more than 1300mm, and the value of the ASU convexity preset value is taken between 30 and 60;
the pre-adjustment of emulsion control mode and emulsion injection flow data includes: the control mode that the emulsion is sprayed at the spray plate and is sprayed from the two sides of the strip steel is selected, the left-side spray flow is controlled at 2300-2500L/min, and the right-side spray flow is controlled at 2300-2500L/min.
Optionally, the step of checking the cold-hard coil off line to find the roll mark defect and determining the roll to be rolled with the defect comprises the following steps:
the cold hard coil with roll mark defects found by off-line rechecking is uncoiled by a tailor welding machine set to confirm the defect position, the defect period and the defect size;
classifying the cold-hard coils, formulating a target thickness, controlling the reduction amount to be between 10 and 20 mu m and the reduction rate to be between 20 and 35 percent by adjusting the rolling mill reduction, and evaluating whether the roll mark defects can be eliminated after rolling according to the pass reduction;
and evaluating the cold hard coil which can be eliminated after the rolling defect is rolled according to the pass rolling reduction, and determining the cold hard coil as the coil to be rolled.
Optionally, uncoiling the steel strip by a tailor welding machine to confirm the defect position, defect period and defect size, wherein the step of sampling the cold hard coil by the tailor welding machine comprises measuring the defect position, defect period and defect size on the sampled steel strip formed by sampling.
Optionally, the defective coil to be rolled is moved to a rolling mill coiler to perform centering operation, including:
and (3) after the defective coil to be rolled is conveyed to a mandrel of a coiling machine by using a coil conveying trolley, carrying out centering operation on the defective coil to be rolled, ensuring that the central line of the coil is superposed with the central line of the rolling machine, and controlling the centering error of the defective coil to be rolled to be less than or equal to 3 mm.
Optionally, the formal rolling of the coil with the defect to be rolled to obtain a strip product without the roll mark defect further comprises:
and modifying the specification parameters of the brought-out product to inform the plan to hang the list for arranging the next process production, wherein the specification parameters comprise weight, thickness and length.
The beneficial effect of this application is as follows: the application provides a method for eliminating roll mark defects on the surface of strip steel in a cold rolling process, which specifically comprises the steps of finding out roll mark defects, judging that a steel coil capable of being repaired belongs to a coil with the defects to be rolled, subsequently carrying out centering operation and threading operation on the coil with the defects to be rolled on a coiling machine, carrying out pre-adjustment according to early-stage rolling data, carrying out trial rolling on the coil with the defects to be rolled by a first length, carrying out secondary adjustment on the rolling data, basically and subsequently carrying out formal start-up rolling to eliminate the roll mark defects of the strip steel of the coils with the defects to be rolled; if the cold-rolled product is rolled for N times, the method performs N +1 times of rolling on the strip steel through the single-stand reversible rolling mill, can eliminate partial roll mark defects through secondary rolling of the rolling mill, can solve the problem of reduction of strip output caused by degradation or waste judgment due to more roll mark defects on one hand, and can ensure the product quality, improve the added value of the product and reduce the cost and the economic loss on the other hand.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
FIG. 1 is a flow chart of a method for eliminating roll mark defects on the surface of a strip steel in a cold rolling process provided by the application.
FIG. 2 is a schematic view of a threading operation in the step shown in FIG. 1.
The attached drawings are marked as follows: 100-last finished coil, 200-to-be-rolled defective coil, and 300-rolling mill body.
Detailed Description
The embodiment of the application solves the technical problems of quality defects, product value reduction and production cost increase caused by the fact that products with roll mark defects are produced through cold rolling in the related technology by providing the method for eliminating the roll mark defects on the surface of the strip steel in the cold rolling process.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a method for eliminating roll mark defects on the surface of strip steel in a cold rolling process comprises the following steps: the cold-hard coil is subjected to off-line recheck to find the roll mark defect, and a coil to be rolled with the defect is determined; moving the defective coil to be rolled to a rolling mill coiler, and performing centering operation and threading operation; searching early-stage rolling data of the to-be-rolled defect coil, and pre-adjusting coiling parameters of the to-be-rolled defect coil on line; rolling the coil to be rolled with the defect by a first length according to the preset start parameter, and adjusting the rolling data for the second time according to the plate shape state after the rolling test; and according to the rolling data after the second adjustment, formally starting and rolling the coil with the defects to be rolled so as to obtain a taken-out product without the roll mark defects.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
Referring to fig. 1, the present embodiment discloses a method for eliminating roll mark defects on a surface of a strip steel in a cold rolling process, which includes: the roll mark defect is found by the offline rechecking of the cold-hard roll, the roll mark defect which can be repaired is judged, and the cold-hard roll with the roll mark defect which can be repaired according to the method is the roll with the defect to be rolled determined in the step; moving the defective coil to be rolled to a rolling mill coiler, and performing centering operation and threading operation; searching early-stage rolling data of the to-be-rolled defect coil, wherein the early-stage rolling data refers to rolling data of a cold hard coil formed by early-stage cold rolling, and pre-adjusting coiling parameters of the to-be-rolled defect coil on line; according to the pre-adjusted starting parameters, a first length can be selected from 0.5-2m, preferably 1m, is rolled in a trial mode for the to-be-rolled defect coil, the rolling is stopped after the first length is rolled, and the rolling data is adjusted for the second time according to the plate shape state after the trial rolling; and according to the rolling data after the second adjustment, carrying out formal start rolling on the coil with the defects to be rolled so as to obtain a taken-out product with the roll mark defects eliminated, and specifically, eliminating the roll mark defects of the taken-out product as much as possible.
It should be noted that the pre-adjustment of the parameters of the to-be-rolled defect coil lifting machine on the line can also be described as a first adjustment; therefore, the adjustment of the rolling data after the trial rolling of the first length is expressed as a second adjustment.
If the cold-rolled product is described to be rolled for N times, the method can be used for rolling the strip steel for N +1 times by a single-stand reversing mill, and partial roll mark defects can be eliminated by secondary rolling of the mill. On one hand, the problem of reduction of the output quantity caused by degradation or waste judgment due to more roll mark defects can be solved; on the other hand, the product quality is ensured, the added value of the product is improved, and the cost and the economic loss are reduced.
Referring to fig. 1, during the beginning of the review and the re-inspection to find the roll mark defect and determine the roll to be rolled, the roll can be uncoiled again by the tailor welding machine set to confirm the position, the period and the size of the defect, and the severity of the defect can be evaluated in cooperation with the professional.
Optionally, a sampling method can be adopted, specifically, the cold and hard coils are sampled in the splicing welding machine group, the sampling length can be controlled to be 1-2m, the specific position, the defect period and the defect size of the defects on the sampled strip steel formed by sampling are measured, and the severity of the defects is evaluated.
In batch processing, the method can also be used for
Classifying cold and hard coils or called out-of-band products, jointly determining marks of similar specifications by combining varieties, quality and plans, judging, making a rolling plan, and making a target thickness. The thickness of the product is 0.35-0.5mm, the rolling reduction is controlled between 10-20um and between 20-35 percent by adjusting the rolling reduction of the rolling mill, and whether the roll mark defects can be eliminated after rolling is evaluated according to the pass rolling reduction.
The operation also comprises the step of comprehensively considering the severity of the defects and the judging thickness, and calculating the pass reduction to evaluate whether the defects can be eliminated. And evaluating the cold hard coil which can be eliminated after the rolling defect is rolled according to the pass rolling reduction, and determining the cold hard coil as the coil to be rolled.
The reduction rate is controlled to be between 20% and 35%, the strip can enter a finished product pass more quickly when the strip starts, the wave shapes on the two sides of the strip steel are smaller, and the defect that the strip of the rolling mill is broken and stops due to the fact that the working roll is damaged to cause the defect of cavity printing when the strip starts due to the fact that the reduction rate is too large is overcome.
Judging the defective coil to be rolled, and arranging a rolling mill technician to carry out 'N + 1' pass rolling on the defective coil to be rolled according to the judged thickness requirement.
Before the formal start-up rolling, preparation work is carried out, including centering work and threading work. In the method, the strip steel is rolled for N +1 times by the single-stand reversible rolling mill, so that before the centering operation, the defect coil to be rolled is hoisted to a rolling mill coiler saddle, a specific coiling and threading mode needs to be selected, and the outer diameter and the width of the defect coil to be rolled need to be measured. The actual length of the defective coil to be rolled is calculated by measuring the outer diameter and the width, and the calculation process is generally automatically calculated according to field equipment, which is not described herein. In the operation, the actual length of the defective coil to be rolled is obtained, on one hand, the actual length is changed because the original strip product is correspondingly processed after being rolled into a cold-hard coil in N times; on the other hand, in consideration of the reversible rolling mill, the steel coil cannot be completely unwound in the unwinding process during the subsequent formal rolling, about 3 to 5 turns of the steel coil are generally reserved in the mandrel of the coiler, and the actual length value is obtained in advance to be beneficial to controlling the stop point of the rolling.
Before the centering operation, it is preferable to select an appropriate rolling direction in consideration of smooth threading of the rolling mill equipment, in accordance with the characteristics of the rolling mill body.
The centering operation of the preparation work specifically comprises the step of carrying out centering operation after the to-be-rolled defective coil is moved to the position of a mandrel of a coiling machine by using a coil conveying trolley so as to ensure that the central line of the to-be-rolled defective coil is coincident with the central line of the rolling machine. Optionally, in order to cope with the defect that the rolling process is difficult when the thickness of the defect coil to be rolled is small, the centering error of the defect coil to be rolled is controlled to be less than or equal to 3mm, which is beneficial to ensuring the stable rolling.
Further, the method performs 'N + 1' pass rolling on the defective coil to be rolled, has strict requirements on rolling data, ensures that wave shapes on two sides are symmetrical when starting and stably rolling in order to ensure rolling stability, avoids the unfavorable condition of strip breakage caused by deviation of strip steel plate types, and controls the centering error of the defective coil to be rolled to be less than or equal to 3 mm. In this scope, be favorable to the departure tension deviation less, improve the unusual unfavorable condition of upper and lower roll shifting that appears in the rolling process, be favorable to promoting rolling speed, guarantee that rolling stability is good.
In the preparation work, the threading operation is carried out after the centering of the defective coil to be rolled is finished. Referring to fig. 2, a previous finished product coil 100 is reserved in a rolling mill before threading, the previous finished product coil 100 is placed in a rolling mill body 300 and on a roller, the strip head of a strip steel of a coil 200 to be rolled with a defect is lapped on the strip steel of the previous finished product coil 100, specifically, the strip steel part of the previous finished product coil 100 close to the tail part, the defect that the head part is easily clamped into a device gap when the strip steel is threaded when the thickness of the strip steel is small is overcome by adopting the method, unnecessary blocking in the threading process is effectively avoided, field devices and the previous finished product coil 100 are fully utilized, and almost no cost exists.
In fig. 2, the left-most and right-most winding heads respectively represent an outlet winding head and an inlet winding head, the inlet winding head being generally higher than the outlet winding head to facilitate movement of the uncoiled strip of the defective coil 200 to be rolled.
Optionally, the strip steel of the portion of the defective roll 200 to be rolled on the strip steel of the previous finished roll 100 can be adjusted manually to ensure the threading is performed smoothly.
Optionally, after the strip head of the strip steel of the defective coil to be rolled penetrates the outlet guide roll, the lower wire of the last finished coil is unloaded, a thick-wall sleeve is additionally arranged on the outlet coiling machine, the thickness of the thick-wall sleeve is larger than that of the strip steel of the defective coil to be rolled, and the hidden danger that the finished coil collapses in the unloading process due to the fact that the thickness of the strip steel of the defective coil to be rolled is smaller is improved.
And then, searching early-stage rolling data of the to-be-rolled defect coil, and pre-adjusting the coiling parameters of the to-be-rolled defect on line. The early rolling data refers to rolling data of cold and hard coils formed by early cold rolling, and the early rolling data comprises the following steps: the steel coil number, the steel type, the thickness and the width of the coil to be rolled, a roll shifting value of a middle roll, a leveling value and an ASU (automatic gauge Unit) convexity value.
And after searching early-stage rolling data, pre-adjusting rolling parameters of the to-be-rolled defect roll-up on the line, wherein the pre-adjusting is carried out on rolling force, front and back tension values, a middle roller shifting value, an ASU convexity preset value, an emulsion control mode and emulsion jet flow data according to the steel type and specification of the to-be-rolled defect roll, so that the roll mark defect can be improved by rolling.
The pre-adjustment of several parameters is explained here. The pre-adjustment of the roll shifting value of the middle roll comprises the steps of respectively reducing 5-10 rolls on two sides according to the final roll shifting value after the last rolling so as to start the rolling, and the hidden danger of belt breakage accidents caused by large wave shape in the moment of starting the rolling is improved. Alternatively, the departure shape may tend to be tighter, and a method of gradually adjusting the roll-shifting value by attempting to see the actual wave shape state in the departure may be selected.
The pre-adjustment of the ASU convexity preset value comprises that the width W of the strip steel of the defect coil to be rolled is not less than 800mm and not more than 1300mm, and the ASU convexity preset value is taken between 30 and 60. According to different strip widths, different convexity values are selected according to experience, specifically, the preset value of the ASU convexity is set by combining the rolling characteristic, the raw material hot rolling genetic characteristic and the characteristic that the strip is thick in the middle and thin twice, and the purpose is to ensure the rolling and the good plate convexity.
The pre-adjustment of the emulsion control mode and the emulsion injection flow data comprises a control mode of selecting the injection plate for injecting the emulsion and injecting the emulsion from two sides of the strip steel, wherein the left injection flow is controlled to be 2300-dose 2500L/min, optionally 2400L/min, and the right injection flow is controlled to be 2300-dose 2500L/min, optionally 2400L/min, so that the strip shape stability is facilitated. By setting the emulsion control mode and the injection flow, the band steel is ensured to have higher temperature when starting, and the unfavorable condition that the band steel to be rolled with a defective coil is brittle failure when starting is improved.
Regarding the setting of the above-mentioned injection flow, it should be noted that, as the rolling proceeds, the flow rate increases with the speed, the flow rate increases gradually, and the strip temperature decreases gradually, so as to achieve the purpose of cooling the strip and the roll, and improve the cooling efficiency.
The start-up parameters are pre-adjusted, and the modified rolling table data are carefully checked, so that the adverse consequence of strip breakage of the rolling mill caused by data input errors is avoided.
After the start parameters are pre-adjusted, the rolling defect coil is rolled for a first length in a trial mode according to the pre-adjusted start parameters, the first length can be selected to be 0.5-2m, preferably 1m, the rolling defect coil is immediately stopped after being rolled for the first length, the rolling force is unloaded, the band steel at the position of a roll gap is rolled to the position of a guide roller in a linkage mode, an operator scans the outline of the band steel according to the shape of the rolled band steel and the tightness degree of the edge of the band steel, and rolling data are adjusted for the second time according to the shape state after trial rolling. By the method, the hidden danger that the roller is damaged due to belt breakage during blind start rolling is improved.
The parking inspection after rolling the first length of the coil with the defect to be rolled comprises the steps of inspecting whether the wave shapes on the two sides of the strip steel are symmetrical or not, inspecting the condition that the thickness of the rolled strip steel is out of tolerance, adjusting the rolling data in time according to the actual condition on site, and avoiding serious consequences even if the strip is broken. The operation can be carried out for a plurality of times for stable rolling, and the adverse effect of belt breakage caused by blind start is improved.
And after the rolling data is adjusted for the second time, according to the rolling data after the second adjustment, the coils with the defects to be rolled are formally started and rolled to obtain the output products without the roll mark defects, in particular to obtain the output products without part or all of the roll mark defects.
And carrying out formal start-up rolling on the coil to be rolled with the defects, and stopping the coil after the coil is formally started up and rolled for a second length, wherein the second length is more than 5 meters, 10 meters or 15 meters, so as to check the surface quality of the rolled strip steel, pay close attention to the surface quality and improve the unfavorable condition of newly-grown defects.
And when the rolling is formally started, the strip steel shape strategy control of the defective coil to be rolled is adopted, wherein the strip steel shape strategy control comprises shape process control and thickness control so as to accurately control the target thickness and carry out surface quality key inspection, thereby stabilizing the rolling and achieving the effect of eliminating the quality hidden trouble.
The strip shape process control comprises the step of controlling the wave shape of the edge of the strip steel according to the coverage rate of the edge of the strip steel, wherein when the coverage rate of the edge is more than or equal to 50%, the two side edges are controlled to be 35-45I-U, and when the coverage rate of the edge is less than 50%, the two side edges are controlled to be 20-30I-U.
Specifically, the relative extension difference ε ═ L max -L min ) 10 in/L, I-U 5 ε, which is an elongation difference of 1mm in a strip of 100m in length, is 1I unit. The edge coverage (strip width W/52) is 100% in decimal part. When the coverage rate of the edge part is between 50% and 99.9%, namely more than or equal to 50%, the edge part (narrow strip) at the outermost part shows the trend of plate shape, and the two side edge parts are controlled between 35-45I-U; when the edge coverage rate is less than 50%, the edge of the most edge strip shape represents the size of the real strip shape, and the two side edges are controlled to be 20-30I-U. The wave traveling control standard is adopted, so that the stable control is facilitated, and the advantages of less broken belt and high stability are achieved.
The thickness control comprises checking the alloy compensation coefficient of the thickness gauge, and the defect that the thickness of a finished product is unqualified due to the error of the alloy compensation coefficient is avoided.
Optionally, the formal rolling of the coil with the rolling defect to be rolled, after obtaining the out-of-band product without the rolling mark defect, further includes: and modifying the specification parameters of the brought-out products to inform the plan to hang the list, and arranging the next procedure production including quenching production according to the follow-up procedure, wherein the specification parameters comprise weight, thickness and length.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for eliminating roll mark defects on the surface of strip steel in a cold rolling process is characterized by comprising the following steps:
the cold-hard coil is subjected to off-line recheck to find the roll mark defect, and a coil to be rolled with the defect is determined;
moving the coil to be rolled with the defects to a rolling mill coiler, and performing centering operation and threading operation;
searching early-stage rolling data of the to-be-rolled defect coil, and pre-adjusting the coiling parameters of the to-be-rolled defect on line;
according to the pre-adjusted start-up parameters, the defect roll to be rolled is rolled for a first length in a trial mode, and rolling data are adjusted for the second time according to the plate shape state after trial rolling;
and according to the rolling data after the second adjustment, formally starting and rolling the coil with the defects to be rolled so as to obtain a taken-out product with the roll mark defects eliminated.
2. The method of claim 1, wherein the defective coil to be rolled is rolled by formal start-up, further comprising:
stopping after the formal start-up rolling for the second length so as to check the surface quality of the rolled strip steel;
the strip steel plate shape strategy control of the defect coil to be rolled during the formal start-up rolling comprises plate shape process control and thickness control; the strip shape process control comprises the steps of controlling the wave shape of the edge of the strip steel according to the coverage rate of the edge of the strip steel, controlling the edge at two sides to be 35-45I-U when the coverage rate of the edge is more than or equal to 50%, and controlling the edge at two sides to be 20-30I-U when the coverage rate of the edge is less than 50%; the thickness control includes verifying the compensation coefficient of the thickness gauge alloy.
3. The method according to claim 1, characterized in that said defective coil to be rolled undergoes said threading operation, comprising:
and reserving the previous finished coil in a rolling mill before threading, and lapping the strip head of the strip steel of the coil with the defects to be rolled on the strip steel of the previous finished coil.
4. The method of claim 3, characterized in that after threading the strip head of the defective roll to be rolled to the exit guide roll, the lower wire of the upper finished roll is unwound, and a thick-walled sleeve is added to the exit coiler, the thickness of the thick-walled sleeve being greater than the strip thickness of the defective roll to be rolled.
5. The method of claim 1, wherein the upfront rolling data comprises: the steel coil number, the steel type, the thickness and the width of the coil to be rolled with the defects, a roll shifting value of a middle roll, a leveling value and an ASU (automatic gauge Unit) convexity value;
the pre-adjusting of the coiling parameters of the to-be-rolled defects on the line comprises the following steps: and pre-adjusting the rolling force, the front and rear tension values, a middle roller shifting value, an ASU convexity preset value, an emulsion control mode and emulsion jet flow data according to the steel grade and specification of the coil to be rolled with the defects.
6. The method of claim 5, wherein the pre-adjusting of the roll shifting value of the intermediate roll comprises respectively reducing the roll shifting value of the intermediate roll by 5-10 on both sides according to the final roll shifting value after the last rolling for starting rolling;
the pre-adjustment of the ASU convexity preset value comprises the following steps: the width W of the strip steel of the defective coil to be rolled is not less than 800mm and not more than 1300mm, and the value of the ASU convexity preset value is taken between 30 and 60;
the pre-adjustment of the emulsion control mode and the emulsion injection flow data comprises the following steps: the control mode that the emulsion is sprayed at the spray plate and is sprayed from the two sides of the strip steel is selected, the left-side spray flow is controlled at 2300-2500L/min, and the right-side spray flow is controlled at 2300-2500L/min.
7. The method of claim 1, wherein the step of performing an offline review on the chilled rolls to find roll mark defects and determining a defective roll to be rolled comprises the steps of:
the cold hard coil with roll mark defects found by off-line rechecking is uncoiled by a tailor welding machine set to confirm the defect position, the defect period and the defect size;
classifying the cold and hard coils, formulating a target thickness, controlling the reduction amount to be between 10 and 20 mu m and the reduction rate to be between 20 and 35 percent by adjusting the rolling mill reduction, and evaluating whether the roll mark defects can be eliminated after rolling according to the pass reduction;
and evaluating the cold hard coil which can be eliminated after the rolling mark defect is rolled according to the pass rolling reduction, and determining the cold hard coil as the coil to be rolled.
8. The method of claim 7, wherein said determining the defect location, defect cycle and defect size by said tailor welding machine uncoiling comprises sampling said chilled coil at said tailor welding machine and measuring the defect location, defect cycle and defect size on the sampled strip steel formed by the sampling.
9. The method according to claim 1, wherein said moving said defective coil to be rolled to a rolling mill coiler for said centering operation comprises:
and after the defective coil to be rolled is conveyed to a mandrel of the coiling machine by using a coil conveying trolley, carrying out centering operation on the defective coil to be rolled, ensuring that the central line of the steel coil is superposed with the central line of the rolling machine, and controlling the centering error of the defective coil to be rolled to be less than or equal to 3 mm.
10. The method of claim 1, wherein the formal start-up rolling of the coil to be rolled with the defects is performed to obtain a strip-out product with the roll mark defects eliminated, and the method further comprises the following steps:
and modifying the specification parameters of the taken products to inform a plan hang list for arranging the next process production, wherein the specification parameters comprise weight, thickness and length.
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