Disc edge shearing control method based on incoming material width early warning

Abstract

The invention relates to the technical field of cold rolling trimming width fixing, and particularly discloses a disc shearing edge control method based on incoming material width early warning, which comprises the following steps: S1, obtaining strip steel width data before disc shearing; s2, drawing a strip steel width map; s3, obtaining a set value Width (0) of the opening width of shear blades on the two sides of the roll of circle shear; s4, calculating a trimming risk coefficient lambda of each position of the full length of the strip steel in real time; s5, the group control system receives the trimming risk coefficient parameter lambda (x) in real time, and different control strategies are automatically adopted in a grading mode; s6, according to the width data set psi (i, W (x)) measured by different devices i before the circle shear, the control strategy in the step S5 is also applied; and S7, repeating the steps for each coil of strip steel so as to realize hierarchical control on different trimming narrow rule risks. According to the production line, different control strategies such as edge cutting exiting through edge digging and speed reduction edge cutting are adopted according to the edge cutting risk degree, the accuracy is higher, cost is not additionally increased, and the economical efficiency is high.

Description

Technical Field

[0001] The invention relates to the technical field of cold rolling trimming and width setting, and in particular to a disc shearing edge control method based on incoming material width early warning. Background Art

[0002] Cold-dip galvanized and hot-dip galvanized sheets are widely used in the automotive, home appliance and other industries, which have high requirements for the surface quality, performance and dimensional accuracy of the strip. Among them, the width accuracy is related to the user's material utilization rate and affects the user's raw material usage cost. According to the national standard GB / T 708-2006 "Dimensions, Shape, Weight and Permissible Deviations of Cold-rolled Steel Sheets and Strips", the width is ≤1200mm, and the high-precision requirement for the width is 0~+2mm; 1200mm<width≤1500mm, the high-precision requirement for the width is 0~+2mm; 1500mm<width, the high-precision requirement for the width is 0~+3mm.

[0003] The width accuracy of cold-rolled products is generally achieved by a circular shear arranged in the finished product process. The width accuracy of the circular shear is 0-1mm, and the minimum trimming amount on one side is 7mm. In actual production, a double-side trimming amount of about 15mm-20mm is generally reserved. When the reserved trimming amount is insufficient, it is easy to cause accidents such as edge blocking and edge tearing of the circular shear.

[0004] In order to prevent accidents such as edge blocking and tearing of the disc shear, it is usually necessary to increase the reserved trimming amount, sacrifice the yield rate, and increase the manufacturing cost. Even if a large amount of trimming is reserved, unpredictable width narrowing will still occur during the hot rolling, cold rolling, annealing, and leveling processes, resulting in insufficient trimming when the disc shear is actually trimming, resulting in accidents such as edge blocking and tearing of the disc shear. The faster the trimming speed, the higher the risk and severity of the accident.

[0005] Patent with authorization announcement number CN 111906145 B, a method and system for identifying the risk of edge blocking in cold rolling production line disc shears, the risk of edge blocking caused by the characteristics of hot rolling incoming materials based on hot rolling incoming material data, and the risk of edge blocking caused by the deviation of cold rolling strip running based on cold rolling deviation monitoring data. The basic data used by this method are mainly the hot rolling width and the lateral offset of the cold rolling CPC correction system, ignoring the change in strip width during the process of cold rolling, cold rolling, annealing, and leveling, and only giving a warning of edge blocking risk from the perspective of strip deviation. It is an early warning of the relative degree of deviation risk, which is different from the method of directly depicting the strip width map before trimming in the present invention.

[0006] The patent application publication number CN 114273427A is a method for identifying the risk of disc shear blocking failure. Similar to the above patent, it establishes a cold-rolled pickling looper strip deviation prediction model based on the full-length centerline offset, width and other information of the hot-rolled incoming material, and combines the offset detection information of the CPC correction roller to give a deviation alarm and disc shear blocking risk warning, which is different from the method of directly depicting the strip width map before trimming in the present invention.

[0007] The patent application publication number CN 114273427A is a method for preventing edge running of the strip steel. The method mainly detects edge defects of the raw strip steel before edge trimming by setting a grating detection device, so as to detect them in advance and adopt speed reduction and early warning measures. This is different from the purpose of the present invention to solve the edge trimming failure caused by width change.

[0008] The existing technology still needs to improve the warning and targeted measures for trimming risks. In the actual production process, it is necessary to accurately predict the possibility and location of risks, and at the same time, eliminate false alarms caused by uncertainty as much as possible to avoid frequent slowdowns of the production line affecting production efficiency. Therefore, it is necessary to design a disc shearing edge control method based on incoming material width warning. The technical problem to be solved is to accurately predict the risk and location of trimming failure before the strip enters the disc shear for shearing, and guide the disc shear to adopt corresponding strategies to avoid production accidents such as narrow-gauge blocking wire and tearing edge. Summary of the invention

[0009] In view of the problems existing in the prior art, the purpose of the present invention is to provide a disc shearing edge control method based on incoming material width warning. In the area before the disc shear and where the strip does not change in width, the width data is collected, and the collected width data is used to draw a width map in real time. The target width of the strip trimming and the minimum trimming amount of the disc shear are used as constraints to dynamically analyze the risk of trimming accidents caused by insufficient trimming. The production line adopts different control strategies such as digging and exiting trimming, and reducing speed trimming according to the degree of trimming risk, so as to avoid production accidents such as edge blocking and edge tearing of the disc shear. Furthermore, according to the degree of trimming risk, the trimming amount is reduced as much as possible within the width tolerance to improve the yield rate.

[0010] The technical solution adopted by the present invention to solve the technical problem is: a disc shear edge control method based on incoming material width warning, comprising the following steps:

[0011] S1. Obtain the strip width data before the disc shear;

[0012] S2, drawing a strip width map;

[0013] S3, obtaining the setting value Width(0) of the opening width of the cutting blades on both sides of the roll disc shear;

[0014] S4, real-time calculation of the trimming risk coefficient λ at each position along the entire length of the strip, λ(x)=(W(x)-Width(0)) / b / 2;

[0015] S5, the group control system receives the trimming risk coefficient parameter λ(x) in real time and automatically adopts different control strategies in different levels;

[0016] S6, for the width data set ψ(i, W(x)) measured by different devices i before the disc shear, the control strategy in step S5 is also applicable;

[0017] S7. Repeat the above steps for each roll of strip steel, so as to achieve graded control of the risks of different trimming narrow sizes.

[0018] Specifically, the strip width data in step S1 is collected before the disc shear and in the area where the strip width does not change. Before the disc shear, that is, the continuous annealing unit / continuous hot-dip galvanizing unit is equipped with a surface inspection instrument at the looper exit position. The high-precision surface inspection instrument can distinguish surface defects of the strip with an accuracy of 0.5*0.5mm, and also mine and output high-precision strip width data [X, WO(x), WD(x)], where x represents the distance between the strip and the strip head weld, WO(x) represents the distance between the operating side edge of the strip at the corresponding length position and the center line of the equipment, and WD(x) represents the distance between the transmission side edge of the strip at the corresponding length position and the center line of the equipment. Similarly, high-precision width data of other devices are also mined and collected.

[0019] Specifically, the strip width map in step S2 establishes a data group for a single steel coil, the strip width W(x)=WO(x)+WD(x) at a distance x from the strip head weld, and the continuous width data group ψ(i, W(x)) of the steel coil at different devices i before the disc shear.

[0020] Specifically, i in the width data group ψ(i, W(x)) represents the equipment number for collecting width data, and the equipment number includes but is not limited to a meter and a width gauge, and W(x) represents the measured width of the equipment at a distance x from the strip head weld.

[0021] Specifically, the minimum cutting width b of the circular shear at the highest speed Vmax in step S3 is usually b=7 mm.

[0022] Specifically, the trimming risk coefficient parameter λ(x) in step S5 is ≥ 1, and when the unit runs to the disc shear area at a distance x from the strip head weld, the disc shear is put into use normally;

[0023] λ(x)<1, and λ(x)≥0.8, the unit will reduce speed to Vmax*λ(x) before the strip reaches the disc shear at a distance x from the strip head weld;

[0024] λ(x)<0.8, and λ(x)≥0.6, the unit slows down to the minimum trimming speed Vmin before the strip reaches the disc shear at a distance x from the strip head weld, generally Vmin=30m / min;

[0025] λ(x)<0.6, when the distance x between the strip and the strip head weld reaches the crescent shear in front of the disc shear, the unit stops cutting the crescent digging edge, and the disc shear withdraws at the crescent digging edge position. The subsequent strip is not cut and flows to the rewinding unit for cutting.

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

[0027] The disc shearing edge control method based on incoming material width warning designed by the present invention uses the width data of the area before the disc shearing and when the strip does not change in width as a criterion for determining the narrowness of the strip, which has higher accuracy and can more effectively prevent the narrow-edge cutting accidents.

[0028] The disc shearing edge control method based on incoming material width warning designed by the present invention adopts different control strategies according to the drawn width map, with the strip cutting edge target width and the minimum cutting amount of the disc shear as constraints, which can minimize the impact on production efficiency.

[0029] The disc shearing edge control method based on incoming material width warning designed by the present invention obtains width data from an existing meter inspection instrument of the unit or other devices that can convert and output width data, does not increase additional costs, and is highly economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a flow chart of the disc shear edge control method based on incoming material width warning.

[0031] Figure 2 It is a schematic diagram of the data collection and control area before the disc shear of the continuous annealing unit in the embodiment.

[0032] In the figure: 1-meter tester; 2-disc shear; 3-strip running direction. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] like Figure 1As shown, a disc shear edge control method based on incoming material width warning includes the following specific steps: obtaining the strip width data before the disc shear, drawing a strip width map, obtaining the shear blade opening width setting value on both sides of the disc shear, calculating the cutting edge risk coefficient at each position of the entire length of the strip in real time, and automatically adopting different control strategies according to the unit level.

[0035] like Figure 2 As shown, in the continuous hot-dip galvanizing unit of the embodiment, the initial width of the steel coil coil-1 is 1270 mm, the target width of the trimming is 1250 mm, and the minimum single-side trimming width of the disc shear at the maximum speed of 270 mpm is 7 mm.

[0036] When the lead weld of coil-1 passes through the gauge located 50m in front of the disc shear, the edge-finding data of the gauge can be converted into strip width data through PLC communication. The distance from the edge of the strip operating side to the center line of the equipment is recorded as WO(x), and the distance from the edge of the strip transmission side to the center line of the equipment is recorded as WD(x), where x represents the distance from the strip to the lead weld.

[0037] Furthermore, if there are other devices in front of the disc shear that can output and convert into width data, the same method can be used to collect data through PLC communication.

[0038] The above collected data is directly converted into the width W(x) corresponding to the specific distance x between the strip and the strip head weld through calculation, W(x)=WO(x)+WD(x).

[0039] The set value of the shearing blade opening width on both sides of the circular shear is Width(0) = 1250 mm. When the circular shear is at the highest speed Vmax = 270 mpm, the minimum cutting edge width on one side is b = 7 mm.

[0040] Real-time calculation of the trimming risk factor λ at each position along the entire length of the strip. λ(x)=(W(x)-Width(0)) / b / 2.

[0041] The unit control system receives risk factor parameters in real time and automatically adopts different control strategies according to the following conditions:

[0042] If the strip width within 100m from the strip head is 1264mm or above, and λ(0-100)≥1, then the disc shear can be used normally when the 100m strip passes through the disc shear.

[0043] If the strip is between 100m-200m away from the strip head, and the strip width is between 1262-1263mm, and 1>λ(100-200)≥0.8 is calculated, then when the strip in the interval of 100-200m away from the strip head weld passes through the disc shear, the unit will automatically reduce the speed to a speed below 231-250mpm. After the speed is reduced, the unit will not automatically increase the speed unless the operator manually increases the speed.

[0044] If the strip is between 200m-300m away from the strip head, and the strip width is between 1259-1261mm, and 0.6≤λ(200-300)<0.8 is calculated, then when the strip in the interval of 100-200m from the strip head weld passes through the disc shear, the unit will reduce the speed to the minimum trimming speed of 30m / min for trimming operation. Unless the operator manually increases the speed, the unit will not automatically increase the speed.

[0045] If the strip is 400m away from the strip head and the strip width is less than 1258mm, the calculated λ(400) is less than 0.6. Then when the strip at 400m away from the strip head weld passes through the disc shear, the machine is stopped to cut the crescent edge. The disc shear withdraws at the crescent edge position, and the subsequent strip is not cut and is transferred to the rewinding unit for cutting.

[0046] The above steps are repeated for each roll of strip steel, thereby achieving graded control of the risks of different trimming narrow sizes and improving production efficiency while avoiding production accidents.

[0047] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.

[0048] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. A disc shear edge control method based on incoming material width warning, characterized in that: The following steps are involved: S1. Obtain the strip width data before the disc shear; S2, drawing a strip width map; S3, obtaining the setting value Width(0) of the opening width of the cutting blades on both sides of the roll disc shear; S4, real-time calculation of the trimming risk coefficient λ at each position along the entire length of the strip, λ(x)=(W(x)-Width(0)) / b / 2; S5, the group control system receives the trimming risk coefficient parameter λ(x) in real time and automatically adopts different control strategies in different levels; S6, for the width data set ψ(i, W(x)) measured by different devices i before the disc shear, the control strategy in step S5 is also applicable; S7. Repeat the above steps for each roll of strip steel, so as to achieve graded control of the risks of different trimming narrow sizes.

2. The disc shear edge control method based on incoming material width warning according to claim 1 is characterized in that: The strip width data in step S1 are collected before the disc shear and in the area where the strip width does not change. Before the disc shear, that is, the continuous annealing unit / continuous hot-dip galvanizing unit is equipped with a surface inspection instrument at the looper exit. The high-precision surface inspection instrument can distinguish surface defects of the strip with an accuracy of 0.5*0.5mm. Similarly, high-precision strip width data [X, WO(x), WD(x)] are mined and output, where x represents the distance between the strip and the strip head weld, WO(x) represents the distance between the operating side edge of the strip at the corresponding length position and the center line of the equipment, and WD(x) represents the distance between the transmission side edge of the strip at the corresponding length position and the center line of the equipment. Similarly, high-precision width data of other devices are also mined and collected.

3. The disc shearing edge control method based on incoming material width warning according to claim 2 is characterized in that: The strip width map in step S2 establishes a data set for a single steel coil, the strip width W(x)=WO(x)+WD(x) at a distance x from the strip head weld, and a continuous width data set ψ(i, W(x)) of the steel coil at different devices i before the disc shear.

4. The disc shearing edge control method based on incoming material width warning according to claim 3 is characterized in that: The i in the width data group ψ(i, W(x)) represents the device number for collecting width data, and the device number includes but is not limited to a meter and a width gauge, and W(x) represents the measured width of the device at a distance x from the strip head weld.

5. The disc shear edge control method based on incoming material width warning according to claim 1 is characterized in that: The minimum cutting width b of the circular shear on one side at the highest speed Vmax in step S3 is usually b=7 mm.

6. The disc shear edge control method based on incoming material width warning according to claim 5 is characterized in that: In the step S5, the trimming risk coefficient parameter λ(x) is ≥ 1, and when the unit runs to the disc shear area at a distance x from the strip head weld, the disc shear is put into use normally; λ(x)<1, and λ(x)≥0.8, the unit will reduce speed to Vmax*λ(x) before the strip reaches the disc shear at a distance x from the strip head weld; λ(x)<0.8, and λ(x)≥0.6, the unit slows down to the minimum trimming speed Vmin before the strip reaches the disc shear at a distance x from the strip head weld, generally Vmin=30m / min; λ(x)<0.6, when the distance x between the strip and the strip head weld reaches the crescent shear in front of the disc shear, the unit stops cutting the crescent digging edge, and the disc shear withdraws at the crescent digging edge position. The subsequent strip is not cut and flows to the rewinding unit for cutting.

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