A disc shear edge control method based on incoming material width early warning

Abstract

The present application relates to the technical field of cold-rolled trimming width control, and specifically discloses a disc shear trimming control method based on incoming material width early warning, S1, obtaining strip steel width data before disc shear; S2, drawing strip steel width atlas; S3, obtaining disc shear two-side shear blade opening width setting value Width(0); S4, real-time calculating trimming risk coefficient λ of each position of strip steel full length; S5, control system real-time receiving trimming risk coefficient parameter λ(x), and automatically adopting different control strategies in stages; S6, for width data group ψ(i, W(x)) measured by different equipment i before disc shear, the same control strategy in step S5 is also applicable; S7, repeating the above steps for each coil of strip steel, thereby realizing grading control of different trimming narrow size risks; the production line adopts different control strategies such as edge digging and trimming speed reduction according to the high and low degree of trimming risk, which is more accurate, does not increase additional cost, and is high in economy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cold rolling trimming width control, in particular to a disc shear trimming control method based on incoming material width early warning. BACKGROUND

[0002] Cold rolled and hot galvanized sheets are widely used in the automobile and household appliance industries, and the surface quality, performance and dimensional accuracy of the strip steel are required to be high. The width accuracy is related to the material utilization rate of the user and affects the raw material use cost of the user. According to the national standard GB / T 708-2006 "Cold Rolled Steel Sheet and Strip Dimension, Shape, Weight and Allowable Deviation", the width is required to be ≤1200mm, the high accuracy requirement of the width is 0-+2mm; 1200mm

[0003] The width accuracy of cold rolled products is generally realized by the disc shear arranged in the finished product process. The width accuracy of the disc shear is 0-1mm, and the minimum trimming amount on one side is 7mm. In actual production, generally, a trimming amount of 15-20mm is reserved on both sides. When the reserved trimming amount is insufficient, accidents such as disc shear edge blocking and edge tearing are easily caused.

[0004] In order to prevent the disc shear from blocking and tearing, it is often necessary to increase the reserved trimming amount, which sacrifices the yield and causes the manufacturing cost to increase. Even if a larger trimming amount is reserved, in the process of hot rolling, cold rolling, annealing and leveling, the width of the strip steel is still difficult to predict, which leads to insufficient trimming amount when the disc shear actually trims, and accidents such as disc shear edge blocking and edge tearing occur. The faster the trimming speed is, the higher the risk and severity of the accident are.

[0005] The patent with the authorized announcement number CN 111906145 B is a disc shear edge blocking risk identification method and system for a cold rolling production line. The disc shear edge blocking risk identification is realized based on the characteristics of the hot rolled incoming material data and the running deviation of the cold rolled strip steel based on the cold rolling deviation monitoring data. The basic data used by the method is mainly the hot rolling width and the transverse offset of the CPC correction system of the cold rolling, which ignores the width change of the strip steel in the process of cold rolling, cold rolling, annealing and leveling. Only from the perspective of the deviation of the strip steel, the edge blocking risk is prompted, which is a relative deviation risk warning. It is different from the method of directly depicting the width map of the strip steel before trimming.

[0006] The patent with the application publication number CN 114273427 A is a method for identifying the risk of edge blocking of a disc shear, which is similar to the above-mentioned patent. According to the full-length center line offset and width information of the hot-rolled material, a cold-rolled and pickled loop strip deviation prediction model is established, and combined with the offset detection information of the CPC correction roller, the deviation alarm and the disc shear edge blocking risk warning are given. It is different from the method of directly depicting the edge cutting strip width atlas before the present invention.

[0007] The patent with the application publication number CN 114273427 A is a method for preventing strip edge deviation, which mainly detects the edge defects of the raw material strip before edge cutting by setting a grating detection device, so as to discover and take early warning measures. It is different from the purpose of solving the width change leading to edge cutting failure in the present invention.

[0008] The existing technology still needs to improve the pertinence of the edge cutting risk warning and the measures taken. In the actual production process, not only the possibility and position of the risk need to be accurately predicted, but also the false alarm caused by uncertainty needs to be eliminated as much as possible to avoid the impact of frequent speed reduction on production efficiency. Therefore, it is necessary to design a disc shear edge cutting control method based on incoming material width warning, which solves the technical problem of accurately predicting the risk and position of edge cutting failure before the strip enters the disc shear for cutting, and guiding the disc shear to take corresponding strategies to avoid narrow size edge blocking, tearing and other production accidents. SUMMARY

[0009] In view of the problems existing in the prior art, the purpose of the present invention is to provide a disc shear edge cutting control method based on incoming material width warning. In the area before the disc shear, the width data of the strip is collected, and the collected width data is real-time drawn width atlas. Taking the target width of the strip edge cutting and the minimum edge cutting amount of the disc shear as the constraint conditions, the risk of edge cutting accident caused by insufficient edge cutting amount is dynamically analyzed. The production line takes different control strategies such as edge cutting exit and speed reduction edge cutting according to the edge cutting risk degree, to avoid production accidents such as edge blocking and tearing of the disc shear. Further, according to the edge cutting risk degree, the edge cutting amount is reduced as much as possible within the width tolerance, and the yield is improved.

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

[0011] S1, obtaining the width data of the strip before the disc shear;

[0012] S2, depicting the width atlas of the strip;

[0013] S3, obtaining the opening width set value Width(0) of the two sides of the disc shear;

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

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

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

[0017] S7, repeat the above steps for each coil of strip, thereby realizing the classification control of different edge narrow risk.

[0018] Specifically, the strip width data in step S1 is collected before the disc shear and in the area where the width of the strip does not change. Before the disc shear, a gauge detector is arranged at the live roll outlet position of the continuous annealing unit / continuous hot galvanizing unit. The high-precision gauge detector can distinguish strip surface defects with a precision of 0.5*0.5 mm, and can also output high-precision strip width data [x, WO(x), WD(x)]. x represents the distance of the strip from the weld seam, WO(x) represents the distance of the strip operating side edge from the center line of the device at the corresponding length position, and WD(x) represents the distance of the strip driving side edge from the center line of the device at the corresponding length position, respectively. Similarly, high-precision width data of other devices is also collected.

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

[0020] Specifically, i in the width data group ψ(i, W(x)) represents the device number of the collected width data, and the device number includes but is not limited to a gauge detector and a width measuring instrument. W(x) represents the measured width of the device at the distance x from the weld seam.

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

[0022] Specifically, the risk coefficient parameter λ(x) in step S5 is λ(x)≥1. When the strip runs to the disc shear area at the distance x from the weld seam, the disc shear is normally put into use.

[0023] λ(x)<1, and λ(x)≥0.8. When the strip reaches the disc shear at the distance x from the weld seam, the speed is reduced to Vmax*λ(x).

[0024] λ(x) < 0.8 and λ(x) ≥ 0.6, the unit is running at the minimum trimming speed Vmin at the position x of the strip from the weld of the strip head to the disc shear before the disc shear, generally Vmin = 30 m / min;

[0025] λ(x) < 0.6, the unit is stopped for trimming the crescent-shaped edge at the position x of the strip from the weld of the strip head to the disc shear before the disc shear, the disc shear is withdrawn at the position of the crescent-shaped edge, and the subsequent strip is not trimmed and is transferred to the recoiling unit for trimming.

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

[0027] The disc shear trimming control method based on incoming material width early warning designed in the present application has higher accuracy by taking the width data of the region without width change of the strip before the disc shear as the basis for determining the narrow size of the strip, and can more effectively prevent the trimming narrow size accident.

[0028] The disc shear trimming control method based on incoming material width early warning designed in the present application can minimize the impact on production efficiency by taking different control strategies according to the drawn width map, with the target width of the strip trimming and the minimum trimming amount of the disc shear as the constraint conditions.

[0029] The disc shear trimming control method based on incoming material width early warning designed in the present application obtains the width data from the existing gauge detector or other devices that can convert output width data, without additional cost, and is highly economical. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a flowchart of the disc shear trimming control method based on incoming material width early warning.

[0031] Figure 2 is a schematic diagram of data acquisition and control region before the disc shear of the continuous annealing unit of the embodiment.

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

[0033] The technical solutions in the embodiments of the present application will be further clearly, completely and specifically described in combination with the accompanying drawings of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0034] As Figure 1As shown, a kind of disc shear edge control method based on incoming material width early warning, including obtaining the strip width data before disc shear, depicting strip width atlas, obtaining the shear blade opening width setting value of the two sides of the coil disc shear, the cutting edge risk coefficient of each position of strip full length is calculated in real time, and the specific steps such as the automatic adoption of different control strategies by unit classification.

[0035] As Figure 2 As shown in the embodiment continuous hot galvanizing unit, the initial width of coil-1 is 1270mm, the edge cutting target width is 1250mm, and the minimum edge cutting width of disc shear is 7mm under the highest speed 270mpm.

[0036] When the head weld of coil-1 passes through the table detector located at the position of 50m before disc shear, the data processing of the edge detection of table detector can be converted into strip width data through PLC communication, the distance of strip operation side edge from equipment center line is recorded as WO (x), and the distance of strip drive side edge from equipment center line is recorded as WD (x), and x represents the distance of strip from head weld.

[0037] Further, if there are other devices that can output converted width data before disc shear, the same way can also be used to collect through PLC communication.

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

[0039] The shear blade opening width setting value of the two sides of the coil is Width (0) =1250mm. Under the highest speed Vmax=270mpm, the minimum edge cutting width b of disc shear is 7mm.

[0040] The cutting edge risk coefficient λ of each position of strip full length is calculated in real time. λ (x) = (W (x) - Width (0)) / b / 2.

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

[0042] Suppose the strip width is all above 1264mm within 100m from head weld, and λ (0-100) ≥1 is calculated, then when the 100m strip passes through disc shear, disc shear is normally put into use.

[0043] If the strip steel is between 100m-200m from the strip head, the strip steel width is between 1262-1263mm, and the calculation is 1>lambda(100-200) >=0.8, then the strip steel in the 100-200m interval from the strip head weld passes through the disc shear, the unit automatically reduces the speed to below 231-250mpm, after the speed is reduced, unless the operator manually increases the speed, the unit does not automatically increase the speed.

[0044] If the strip steel is between 200m-300m from the strip head, the strip steel width is between 1259-1261mm, and the calculation is 0.6 <= lambda(200-300) <0.8, then the strip steel in the 100-200m interval from the strip head weld passes through the disc shear, the unit reduces the speed to the minimum trimming speed of 30m / min, unless the operator manually increases the speed, the unit does not automatically increase the speed.

[0045] If the strip steel is 400m from the strip head, the strip steel width is below 1258mm, and the calculation is lambda(400) <0.6, then the strip steel at the 400m position from the strip head weld passes through the disc shear, and the disc shear is withdrawn at the crescent edge position, the subsequent strip steel is not trimmed, and is transferred to the recoiling unit for trimming.

[0046] Each coil of strip steel repeats the above steps, thereby realizing the graded control of different trimming narrow size risks, and improving the production efficiency under the premise of avoiding production accidents.

[0047] The present application is not limited to the above-mentioned embodiments, and anyone should know that the structural changes made under the inspiration of the present application, any technical solution with the same or similar to the present application, falls within the protection scope of the present application.

[0048] The technical, shape, and structure parts not described in detail in the present application are all known technologies.

Claims

1. A method for controlling the edge of a disc shearing device based on incoming material width early warning, characterized in that, Includes the following steps: S1. Obtain the strip width data before the disc shear; S2. Draw the strip width diagram; S3. Obtain the setting value of the opening width of the blades on both sides of the disc shear: Width(0); S4. Calculate the edge risk coefficient λ at each position along the entire length of the strip in real time. λ(x) = (W(x) - Width(0)) / b / 2, where W(x) is the strip width at position x, which is a distance from the strip head weld. S5. The group control system receives the edge cutting risk coefficient parameter λ(x) in real time and automatically adopts different control strategies according to the classification. S6. The control strategy in step S5 also applies to the width data set ψ(i, W(x)) measured by different devices i before the disc shearing. S7. Repeat the above steps for each coil of strip steel to achieve graded control of the risk of different cut edges and narrow lengths; The minimum cutting edge width on one side of the disc shear at its maximum speed Vmax is b, where b = 7 mm. In step S5, the edge cutting risk coefficient parameter λ(x) ≥ 1 means that when the unit moves to the disc shear area at a distance x from the strip to the strip head weld, the disc shear is put into normal operation. If λ(x) < 1 and λ(x) ≥ 0.8, the unit will reduce its speed to Vmax*λ(x) before reaching the disc shear at a distance x between the strip and the weld seam at the strip head. If λ(x) < 0.8 and λ(x) ≥ 0.6, the unit will reduce its speed to the minimum cutting speed Vmin before reaching the disc shear at a distance x from the strip to the strip head weld, where Vmin = 30 m / min. When λ(x) < 0.6, the unit stops cutting the crescent edge when the strip reaches the crescent shear in front of the disc shear at a distance x from the strip head weld. The disc shear exits at the crescent edge cutting position, and the subsequent strip does not cut the edge, but flows to the rewinding unit for edge cutting.

2. The disc shearing edge control method based on incoming material width early warning according to claim 1, characterized in that, 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, the continuous annealing unit / continuous hot-dip galvanizing unit has a surface inspection instrument at the looper outlet. The high-precision surface inspection instrument can distinguish strip surface defects with a precision of 0.5*0.5mm. Similarly, it mines and outputs high-precision strip width data [x,WO(x),WD(x)], where x represents the distance of the strip from the strip head weld, WO(x) represents the distance of the strip operating side edge from the equipment centerline at the corresponding length position, and WD(x) represents the distance of the strip driving side edge from the equipment centerline at the corresponding length position. Similarly, high-precision width data from other devices are also mined and collected.

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

4. The disc shearing edge control method based on incoming material width early warning according to claim 3, characterized in that, In the width data set ψ(i, W(x)), i represents the device number that collects the width data, and W(x) represents the measured width of the strip at a distance x from the strip head weld.

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