A method for correcting thickness deviation between steel coils

Abstract

The embodiment of the present application provides a method for correcting the thickness deviation between steel coils, the method comprising: making a correction template of the steel coil of the grade to be corrected, determining the average thickness of the template of the correction template; calibrating the thickness gauge of at least one group of rolling mills through the correction template, obtaining the measured thickness of each thickness gauge for the correction template; determining the first compensation coefficient of each thickness gauge according to the measured thickness and the average thickness of the template; obtaining the overall thickness average of the steel coils of each rolling mill, and determining the second compensation coefficient of each rolling mill according to the overall thickness average and the measured thickness; based on the first compensation coefficient and the second compensation coefficient, determining the thickness correction coefficient of each rolling mill, the thickness correction coefficient is used to correct the rolling thickness of each rolling mill. The technical solution provided by the present application reduces the thickness deviation between coils to a certain extent, thereby improving the specification consistency of rolled products.

Description

Technical Field

[0001] The present application relates to the field of rolling technology, and in particular to a method for correcting thickness deviation between steel coils. Background Art

[0002] There are usually multiple rolling mills in steel enterprises. Different rolling mills will roll the same grade of steel coils according to the rolling capacity and order situation. Since different rolling mills have different thickness gauges and different thickness control accuracy, there will be thickness deviations between steel coils.

[0003] Based on this, technicians in this field are in urgent need of a method for correcting the thickness deviation between steel coils, so as to reduce the thickness deviation between coils to a certain extent, thereby improving the specification consistency of rolled products. Summary of the invention

[0004] The embodiments of the present application provide a method for correcting the thickness deviation between steel coils, thereby reducing the thickness deviation between coils at least to a certain extent, thereby improving the specification consistency of rolled products.

[0005] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0006] According to one aspect of an embodiment of the present application, a method for correcting thickness deviations between steel coils is provided, the method comprising: making a correction template of a steel coil of a to-be-corrected grade, and determining an average template thickness of the correction template; calibrating thickness gauges of at least one group of rolling mills by means of the correction template, and obtaining the measured thickness of each thickness gauge for the correction template; determining a first compensation coefficient of each thickness gauge according to the measured thickness and the average template thickness, the first compensation coefficient being used to characterize the measurement deviations between each thickness gauge; obtaining an overall thickness average of the steel coils of each rolling mill, and determining a corresponding second compensation coefficient of each rolling mill according to the overall thickness average and the measured thickness, the second compensation coefficient being used to characterize the rolling thickness deviations between each rolling mill; and determining a corresponding thickness correction coefficient of each rolling mill based on the first compensation coefficient and the second compensation coefficient, the thickness correction coefficient being used to correct the rolling thickness of each rolling mill.

[0007] In some embodiments of the present application, the method of making a correction template for the steel coil of the to-be-corrected grade includes: taking a sample at a position 30m away from the tail of the steel coil of the to-be-corrected grade, and cutting a correction template of 100mm*100mm in the middle of the plate width.

[0008] In some embodiments of the present application, determining the mean thickness of the corrected sample includes: using a thin plate thickness gauge to detect the thickness of at least one position of the corrected sample; and calculating the mean thickness of the corrected sample according to the thickness of each position.

[0009] In some embodiments of the present application, the use of a thin plate thickness gauge to detect the thickness of at least one position of the corrected template includes: using a thin plate thickness gauge to respectively detect the thickness of positions 10 mm away from four vertices and the midpoints of four sides on the corrected template.

[0010] In some embodiments of the present application, determining the first compensation coefficient of each thickness gauge according to the measured thickness and the average thickness of the sample plate includes: calculating the first compensation coefficient of each thickness gauge according to the following formula:

[0011] β i =(h 0avg -H ki) / H ki

[0012] Among them, β i is the first compensation coefficient of the thickness gauge corresponding to the i-th rolling mill unit, h 0avg is the mean thickness of the sample, H ki is the measured thickness of the thickness gauge corresponding to the i-th rolling mill unit.

[0013] In some embodiments of the present application, obtaining the overall average thickness of the steel coils of each rolling unit includes: obtaining thickness curve data of the steel coils rolled by each rolling unit from the same thickness gauge in the downstream process, and calculating the overall average thickness of the steel coils of each rolling unit based on the thickness curve data.

[0014] In some embodiments of the present application, the second compensation coefficient of each rolling mill unit is determined according to the overall thickness mean and the measured thickness, including: determining a thickness reference value according to the overall thickness mean and the rolling target thickness; calculating thickness deviation values ​​between each overall thickness mean and the thickness reference value; and determining the second compensation coefficient of each rolling mill unit according to the thickness deviation value and the measured thickness.

[0015] In some embodiments of the present application, determining the thickness reference value based on the overall thickness mean and the rolling target thickness includes: selecting the overall thickness mean with the smallest deviation from the rolling target thickness as the thickness reference value.

[0016] In some embodiments of the present application, determining the second compensation coefficient of each rolling mill group according to the thickness deviation value and the measured thickness includes: calculating the second compensation coefficient of each rolling mill group according to the following formula:

[0017] σ i =δh ai / H ki

[0018] Among them, σ i is the second compensation coefficient of the i-th rolling mill group, δh ai is the thickness deviation value of the i-th rolling mill group, H ki is the measured thickness of the thickness gauge corresponding to the i-th rolling mill unit.

[0019] In some embodiments of the present application, the step of determining the thickness correction coefficient of each rolling mill unit based on the first compensation coefficient and the second compensation coefficient includes: calculating the thickness correction coefficient of each rolling mill unit according to the following formula:

[0020] γ i =β i -σ i

[0021] Among them, β i is the first compensation coefficient of the thickness gauge corresponding to the i-th rolling mill unit, σ i is the second compensation coefficient of the i-th rolling mill group.

[0022] Based on the above scheme, this application has at least the following advantages or improvements:

[0023] In the technical solutions provided in some embodiments of the present application, the deviations between the thickness gauges of each rolling unit are determined by making correction templates, and the rolling deviations between each rolling unit are measured to determine the inter-roll thickness deviations between each rolling unit. When controlling subsequent rolling, the inter-roll thickness deviations of each rolling unit can be effectively reduced, thereby improving the specification consistency of the rolled products.

[0024] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0026] Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] In the attached picture:

[0028] Figure 1A flow chart of a method for correcting thickness deviation between steel coils according to an embodiment of the present application is shown;

[0029] Figure 2 A simplified diagram of making a correction template in one embodiment of the present application is shown;

[0030] Figure 3 A flow chart of a method for correcting thickness deviation between steel coils according to an embodiment of the present application is shown;

[0031] Figure 4 A flow chart of a method for correcting thickness deviation between steel coils according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be more comprehensive and complete and fully convey the concept of the example embodiments to those skilled in the art.

[0033] The flowcharts shown in the accompanying drawings are only exemplary and do not necessarily include all the contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps can be decomposed, and some operations / steps can be combined or partially combined, so the actual execution order may change according to actual conditions.

[0034] It should be noted that the "multiple" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0035] See also Figure 1 .

[0036] Figure 1 A flow chart of a method for correcting thickness deviation between steel coils according to an embodiment of the present application is shown. The method may include steps S101-S105:

[0037] Step S101, making a correction sample of the steel coil of the grade to be corrected, and determining the average sample thickness of the correction sample.

[0038] Step S102, calibrating at least one group of thickness gauges of a rolling mill by using the correction template, and obtaining the measured thickness of each thickness gauge for the correction template.

[0039] Step S103, determining a first compensation coefficient of each thickness gauge according to the measured thickness and the average thickness of the sample, wherein the first compensation coefficient is used to characterize the measurement deviation between each thickness gauge.

[0040] Step S104, obtaining the overall thickness average of the steel coils of each rolling unit, and determining the second compensation coefficient of each rolling unit according to the overall thickness average and the measured thickness, wherein the second compensation coefficient is used to characterize the rolling thickness deviation between the rolling units.

[0041] Step S105: Based on the first compensation coefficient and the second compensation coefficient, a thickness correction coefficient of each rolling mill group is correspondingly determined, and the thickness correction coefficient is used to correct the rolling thickness of each rolling mill group.

[0042] In the present application, the deviations between the thickness gauges of each rolling unit are determined by making correction templates, and the rolling deviations between each rolling unit are measured to determine the inter-roll thickness deviations between each rolling unit. When controlling the subsequent rolling, the inter-roll thickness deviations of each rolling unit can be effectively reduced, thereby improving the specification consistency of the rolled products.

[0043] See also Figure 2 .

[0044] Figure 2 A simplified diagram of making a correction template in an embodiment of the present application is shown, 201 is a sampling position of the correction template, and the method of making a correction template for a steel coil of a to-be-corrected grade may include: sampling at a position 30m away from the tail of the steel coil of the to-be-corrected grade, and cutting a correction template of 100mm*100mm in the middle of the plate width.

[0045] See also Figure 3 .

[0046] Figure 3 A flow chart of a method for correcting the thickness deviation between steel coils according to an embodiment of the present application is shown. The method for determining the mean thickness of the sample of the correction sample may include steps S301-S302:

[0047] Step S301: Use a thin plate thickness gauge to detect the thickness of at least one position of the correction sample.

[0048] Step S302, calculating the average thickness of the modified sample according to the thickness at each position.

[0049] In this embodiment, the method of using a thin plate thickness gauge to detect the thickness of at least one position of the correction template includes: using a thin plate thickness gauge to respectively detect the thickness of positions 10 mm away from four vertices and the midpoints of four sides on the correction template.

[0050] In one embodiment of the present application, determining the first compensation coefficient of each thickness gauge according to the measured thickness and the average thickness of the sample plate includes:

[0051] Calculate the first compensation factor for each thickness gauge according to the following formula:

[0052] β i =(h 0avg -H ki) / H ki

[0053] Among them, β i is the first compensation coefficient of the thickness gauge corresponding to the i-th rolling mill unit, h 0avg is the mean thickness of the sample, H ki is the measured thickness of the thickness gauge corresponding to the i-th rolling mill unit.

[0054] In one embodiment of the present application, the method for obtaining the overall average thickness of the steel coils of each rolling mill may include: obtaining the thickness curve data of the steel coils rolled by each rolling mill from the same thickness gauge in the next process, and calculating the overall average thickness of the steel coils of each rolling mill based on the thickness curve data.

[0055] See also Figure 4 .

[0056] Figure 4 A flow chart of a method for correcting thickness deviation between steel coils according to an embodiment of the present application is shown. The method for determining the second compensation coefficient of each rolling mill according to the overall thickness mean and the measured thickness may include steps S401-S403:

[0057] Step S401, determining a thickness reference value according to the overall thickness mean value and the rolling target thickness.

[0058] Step S402, calculating thickness deviation values ​​between the average values ​​of the overall thickness and the thickness reference value.

[0059] Step S403: determining a second compensation coefficient of each rolling mill group according to the thickness deviation value and the measured thickness.

[0060] In the present application, the overall thickness average with the smallest deviation from the rolling target thickness can be selected as the thickness reference value.

[0061] In one embodiment of the present application, according to the thickness deviation value and the measured thickness, a method for correspondingly determining the second compensation coefficient of each rolling mill group may include:

[0062] The second compensation coefficient of each rolling mill is calculated according to the following formula:

[0063] σ i =δh ai / H ki

[0064] Among them, σ i is the second compensation coefficient of the i-th rolling mill group, δh ai is the thickness deviation value of the i-th rolling mill group, H ki is the measured thickness of the thickness gauge corresponding to the i-th rolling mill unit.

[0065] In one embodiment of the present application, the thickness correction coefficient of each rolling mill group is correspondingly determined based on the first compensation coefficient and the second compensation coefficient, including:

[0066] The thickness correction factor of each rolling mill is calculated according to the following formula:

[0067] γ i =β i -σ i

[0068] Among them, β i is the first compensation coefficient of the thickness gauge corresponding to the i-th rolling mill unit, σ i is the second compensation coefficient of the i-th rolling mill group.

[0069] In order to enable those skilled in the art to have a deeper understanding of the present application, a detailed description will be given below in conjunction with a complete embodiment.

[0070] The existing rolling production line, including the 1st to 4th rolling units, takes samples at a position 30m away from the tail of the cold hardened coil rolled by the rolling mill, cuts a 100mm*100mm square sample in the middle of the plate width, and uses a thin plate thickness gauge to detect the thickness of the corrected sample. The thickness at the position 10mm away from the four vertices and the midpoint of the four sides are:

[0071] h 01 =0.601mm;

[0072] h 02 =0.602mm;

[0073] h 03 =0.600mm;

[0074] h 04 =0.601mm;

[0075] h 05 =0.600mm;

[0076] h 06 =0.600mm;

[0077] h07 =0.601mm;

[0078] h 08 =0.602mm;

[0079] Thus, the mean thickness of the sample h can be calculated 0avg =(h01+h02+...+h0j) / j=0.601mm, j=8.

[0080] Calibrate at least one group of thickness gauges of a rolling mill by using the correction sample to obtain the measured thickness of each thickness gauge for the correction sample:

[0081] H k1 =0.658mm;

[0082] H k2 =0.646mm;

[0083] H k3 =0.651mm;

[0084] H k4 =0.649mm;

[0085] Then calculate the first compensation coefficient βi of the thickness gauge corresponding to the 1st to 4th rolling mill groups = (h 0avg -H ki ) / H ki :

[0086] β1=(0.601-0.658) / 0.658=-0.0866;

[0087] β2=(0.601-0.646) / 0.646=-0.06966;

[0088] β3=(0.601-0.651) / 0.651=-0.0768;

[0089] β4=(0.601-0.649) / 0.649=-0.0739.

[0090] Get the overall mean thickness h of the steel coils of each rolling unit aavgi :

[0091] h aavg1 =0.6003mm,

[0092] h aavg2 =0.6021mm,

[0093] h aavg3 =0.5995mm,

[0094] h aavg4=0.6013mm,

[0095] According to the overall thickness mean and the measured thickness, the second compensation coefficient of each rolling mill group is correspondingly determined, and the second compensation coefficient is used to characterize the rolling thickness deviation between each rolling mill group. The thickness value of the first rolling mill group with the smallest deviation from the rolling target thickness of 0.6 mm can be selected as the thickness reference value, that is, = 0.6003 mm, and the overall thickness mean h of each rolling mill group is calculated. aavgi and the thickness reference value h aavg0 Thickness deviation δh ai =(haavgi-haavg0):

[0096] δh a2 =(h aavg2 -h aavg0 )=(0.6021-0.6003)=0.0018mm;

[0097] δh a3 =-0.0008mm;

[0098] δh a4 =0.001mm.

[0099] According to the overall thickness mean and the measured thickness, the second compensation coefficient of each rolling mill group is correspondingly determined, and the alloy compensation coefficient correction value σ of the thickness gauge of each rolling mill group is calculated i ,

[0100] σ 1 =δh ai / H ki =0 / 0.658=0;

[0101] σ 2 =0.0018 / 0.646=0.0028;

[0102] σ 3 =-0.0008 / 0.651=-0.0012;

[0103] σ 4 =0.001 / 0.649=0.0015.

[0104] Based on the first compensation coefficient and the second compensation coefficient, the thickness correction coefficient γ of each rolling mill group is determined accordingly. i .

[0105] γ i =β i -σ i ,

[0106] γ 1=-0.0866+0=-0.0866;

[0107] γ 2 =-0.06966-0.0028=-0.0725;

[0108] γ 3 =-0.0768-(-0.0012)=-0.0756;

[0109] γ 4 =-0.0739-0.0015=-0.0754.

[0110] Will γ i The secondary systems of the 1st to 4th rolling mills are entered for actual rolling so that the thickness target values ​​are the same.

[0111] The present application provides a method for reducing the inter-roll thickness deviation, which is applied in cold rolling production control, including sample making, sample calibration, thickness difference calculation and alloy compensation coefficient correction, so as to achieve the goal of reducing the inter-roll thickness deviation of the same grade of steel coils rolled by different rolling units and improve the thickness consistency.

[0112] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. The present application is intended to cover any variations, uses or adaptations of the present application, which follow the general principles of the present application and include common knowledge or customary technical means in the art that are not disclosed in the present application.

[0113] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A method for correcting thickness deviation between steel coils, It is characterized in that The method comprises: Making a correction sample of the steel coil of the grade to be corrected, and determining the average sample thickness of the correction sample; Calibrate at least one group of thickness gauges of a rolling mill by using the correction sample to obtain the measured thickness of each thickness gauge for the correction sample; Determine a first compensation coefficient of each thickness gauge according to the measured thickness and the average thickness of the sample plate, wherein the first compensation coefficient is used to characterize the measurement deviation between each thickness gauge; Obtaining an overall average thickness of the steel coils of each rolling mill unit, and determining a second compensation coefficient of each rolling mill unit according to the overall average thickness and the measured thickness, wherein the second compensation coefficient is used to characterize the rolling thickness deviation between the rolling mill units; Based on the first compensation coefficient and the second compensation coefficient, correspondingly determining a thickness correction coefficient of each rolling mill group, wherein the thickness correction coefficient is used to correct the rolling thickness of each rolling mill group; Determining the second compensation coefficient of each rolling mill unit according to the overall thickness mean value and the measured thickness includes: Determining a thickness reference value according to the overall thickness mean and the rolling target thickness; Calculate the thickness deviation value between each overall thickness mean value and the thickness reference value; Determining a second compensation coefficient of each rolling mill unit according to the thickness deviation value and the measured thickness; Determining the thickness reference value according to the overall thickness mean and the rolling target thickness includes: The overall thickness mean value with the smallest deviation from the rolling target thickness is selected as the thickness reference value; According to the thickness deviation value and the measured thickness, a second compensation coefficient of each rolling mill unit is correspondingly determined, including: The second compensation coefficient of each rolling mill is calculated according to the following formula: σ i =δh ai / H ki Among them, σ i is the second compensation coefficient of the i-th rolling mill group, δh ai is the thickness deviation value of the i-th rolling mill group, H ki is the measured thickness of the thickness gauge corresponding to the i-th rolling mill unit.

2. The method according to claim 1, It is characterized in that The method of making a correction sample for the steel coil of the grade to be corrected comprises: Take samples at a distance of 30m from the tail of the steel coil to be corrected, and cut a 100mm*100mm correction sample in the middle of the plate width.

3. The method according to claim 1, It is characterized in that The step of determining the mean thickness of the modified sample comprises: Using a thin plate thickness gauge to detect the thickness of at least one position of the correction sample; The average thickness of the modified sample is calculated according to the thickness at each position.

4. The method according to claim 3, It is characterized in that The method of using a thin plate thickness gauge to detect the thickness of at least one position of the correction sample plate comprises: A thin plate thickness gauge is used to measure the thickness at positions 10 mm away from the four vertices and the midpoints of the four sides on the modified sample.

5. The method according to claim 1, It is characterized in that Determining the first compensation coefficient of each thickness gauge according to the measured thickness and the average thickness of the sample plate includes: Calculate the first compensation factor for each thickness gauge according to the following formula: β i =(h 0avg -H ki) / H ki Among them, β i is the first compensation coefficient of the thickness gauge corresponding to the i-th rolling mill unit, h 0avg is the mean thickness of the sample, H ki is the measured thickness of the thickness gauge corresponding to the i-th rolling mill unit.

6. The method according to claim 1, It is characterized in that The step of obtaining the overall thickness average of the steel coils of each rolling unit includes: The thickness curve data of the steel coils rolled by each rolling unit in the next process using the same thickness gauge are obtained, and the overall thickness average of the steel coils of each rolling unit is calculated based on the thickness curve data.

7. The method according to claim 1, It is characterized in that The step of correspondingly determining the thickness correction coefficient of each rolling mill unit based on the first compensation coefficient and the second compensation coefficient includes: The thickness correction factor of each rolling mill is calculated according to the following formula: c i =b i -s i Among them, β i is the first compensation coefficient of the thickness gauge corresponding to the i-th rolling mill unit, σ i is the second compensation coefficient of the i-th rolling mill group.

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