Rolling width control method based on continuously optimized side pressure strategy

Abstract

The application discloses a rolling width control method based on a continuously optimized side pressure strategy, and comprises the following steps: taking a steel type, a blank thickness, a blank width, a finished product thickness and a total side pressure amount as indexes, and presetting a plurality of maximum side pressure amount value strategies for each type of steel; before rough rolling, selecting a maximum side pressure amount value strategy from the plurality of preset maximum side pressure amount value strategies according to the steel type, an actual side pressure demand and a rough rolling width requirement, determining a rolling pass number and side pressure amounts of each pass according to the selected maximum side pressure amount value strategy; and in the rough rolling process, based on the selected rolling pass number and side pressure amounts of each pass, correcting and adjusting side pressure amounts of subsequent passes according to an actual rough rolling width measured after previous pass rolling. The application can improve the rolling width control precision, greatly reduce over-width and wide negative proportion, and significantly improve the finished product yield.

Description

Technical Field

[0001] The present invention relates to the technical field of steel rolling, and in particular to a rolling width control method based on a continuous optimization side pressure strategy. Background Art

[0002] refer to Figure 1 The existing 1549mm hot rolling production line includes a furnace area, a roughing area, a finishing area, a laminar cooling area and a coiling area arranged in sequence. The furnace area includes four heating furnaces arranged in sequence. The roughing area includes a high-pressure water descaling box, a roughing vertical roll mill (VE0), a roughing flat roll mill (R0) and an insulation cover arranged in sequence. The finishing area includes a rotary drum shear, a 7-stand finishing mill (F0~F6 stands), a convexity meter and a flatness meter, as well as a width gauge and a thickness gauge arranged in sequence. The laminar cooling area is equipped with laminar cooling equipment. The coiling area is equipped with two coilers (C1, C2). The hot rolling process based on the 1549mm hot rolling production line is a production method for producing steel coils. It usually uses continuous casting slabs or initial rolled slabs as raw materials. The production process mainly includes the following steps: the slabs are first heated in a heating furnace according to the temperature specified by the process to the target temperature; then they are descaled with high-pressure water and then enter the roughing mill for rolling. The roughing vertical rolls control the width, and the roughing flat rolls control the thickness. Reversible rolling is performed in the roughing mill, generally for 5 to 7 passes; after rolling in the roughing mill, the strip reaches the preset target thickness, width and temperature, and then enters the finishing mill for seven-stand flat roll continuous rolling to achieve the preset target thickness, temperature, convexity and flatness; the strip is then controlled by laminar cooling to reach the target coiling temperature; finally, the strip is formed into a coil by a coiler.

[0003] Width control is one of the most critical control parameters during the hot rolling process. If the finished product width is too narrow, it will be unusable and become scrap. If it is too wide, the user will need to trim the finished product, which will reduce the yield rate. Therefore, width control accuracy is a crucial control parameter in the hot rolling process. In existing 1549mm hot rolling lines, the only equipment for width control is the roughing rolls. Therefore, width control accuracy is ensured by the calculation accuracy of the roll side pressure.

[0004] At present, for 1549mm hot rolling production line, width side pressure control usually adopts the following methods:

[0005] 1) Determine the target width for finishing rolling according to the steel grade and target width for finishing rolling;

[0006] Specifically, the width control is controlled by positive tolerance, the finishing target width is the minimum width required by the user, and the finishing control target width is the sum of the finishing target width and the median value of the tolerance. For example, the finishing target width is 1250 mm, and the tolerance requirement is 0-20 mm, then the finishing target control width is 1250+(20-0) / 2=1260 mm.

[0007] 2) Determine the rough rolling target width according to the finishing control target width and the finishing calculation spread;

[0008] Specifically, the rough rolling target width = finishing control target width - finishing calculation spread.

[0009] 3) Calculate the side pressure amount of each pass according to the rough rolling target width;

[0010] Specifically, in rough rolling, rough rolling is divided into two rolling modes of 5 passes and 7 passes, only the odd pass has side pressure rolling, the even pass has side pressure release rolling, and there is no side pressure and no control. Therefore, when rough rolling is 5-pass rolling, the first, third, and fifth passes have side pressure rolling, and the second and fourth passes do not have side pressure rolling; when rough rolling is 7-pass rolling, the first, third, fifth, and seventh passes have side pressure rolling, and the second, fourth, and sixth passes do not have side pressure rolling.

[0011] The rough rolling side pressure calculation of each pass is calculated with the rough rolling target width (each pass can increase the correction value according to the steel grade) as the target. The specific calculation strategy is as follows:

[0012] The first pass side pressure is calculated with "rough rolling target width - first pass flat roller spread - first pass dog bone spread - second pass flat roller spread" as the target, that is, the first pass side pressure takes the second pass outlet width reaching the rough rolling target width as the target;

[0013] The third pass side pressure is calculated with "rough rolling target width - third pass flat roller spread - third pass dog bone spread - fourth pass flat roller spread" as the target, that is, the third pass side pressure takes the fourth pass outlet width reaching the rough rolling target width as the target;

[0014] The fifth pass side pressure is calculated in the following two cases: when rough rolling is 5-pass rolling, the fifth pass side pressure is calculated with "rough rolling target width - fifth pass flat roller spread - fifth pass dog bone spread" as the target, that is, the fifth pass side pressure takes the fifth pass outlet width reaching the rough rolling target width as the target; when rough rolling is 7-pass rolling, the fifth pass side pressure is calculated with "rough rolling target width - fifth pass flat roller spread - fifth pass dog bone spread - sixth pass flat roller spread" as the target, that is, the fifth pass side pressure takes the sixth pass outlet width reaching the rough rolling target width as the target;

[0015] The side pressure of the 7th pass is calculated based on the "roughing target width - 7th pass flat roll width - 7th pass dog bone width", that is, the side pressure of the 7th pass is calculated based on the goal of the 7th pass outlet width reaching the roughing target width.

[0016] During the rough rolling process, with lateral pressure control, the smaller the lateral pressure, the smaller the risk. On the one hand, when the lateral pressure is small, the width shape of the head and tail is regular, and the overall plate shape is good; on the other hand, when the lateral pressure increases, the probability of scrap steel such as steel bending and slipping will increase accordingly. Some steel types such as silicon steel and cold-rolled materials will be scratched due to excessive dog bones or excessive lateral pressure. Therefore, during the rough rolling control process, each pass is limited to the maximum lateral pressure. At the same time, the maximum lateral pressure also plays the role of distributing the load of the vertical roller. For example, when the maximum lateral pressure distributed in the first pass is small, the vertical roller load will automatically increase and distribute to the third pass. Among them, the maximum lateral pressure is implemented according to the following strategy:

[0017] When the calculation exceeds the maximum lateral pressure, it is executed according to the maximum lateral pressure;

[0018] Where permitted, the smaller the maximum lateral pressure, the better.

[0019] 4) When designing the pass strategy, 5 passes are given priority. Only when 5 passes cannot meet the width requirements, 7 passes are used.

[0020] However, in the actual rolling control process, the above-mentioned width side pressure control strategy still has the following problems:

[0021] When the steel type, specification and total side pressure remain unchanged, the number of rough rolling passes and the maximum side pressure of each pass are fixed values. However, during the rolling process, factors such as the composition and temperature of the strip are constantly changing, resulting in continuous changes in parameters such as the deformation resistance and actual width of the strip in the rough rolling stand. When the current side pressure cannot meet the width control requirements, the strip can only be rolled according to the maximum side pressure of the current pass. As a result, the maximum side pressure frequently fails to meet the width control accuracy during the calculation process, and the over-width phenomenon is common. Due to the different thicknesses of the finished products, the width expansion is also different, and the current determination of the side pressure does not take into account the influence of the thickness of the finished product. No correction calculation is performed between passes. That is, after the current pass is completed, if there is a deviation between the actual width and the calculated width, no correction is performed in the subsequent passes, resulting in a significant impact on the width accuracy. The over-width and negative width phenomena cannot be compensated in time in the subsequent pass control. Summary of the Invention

[0022] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a rolling width control method based on a continuous optimization side pressure strategy.

[0023] The technical solutions of the present invention are as follows:

[0024] A rolling width control method based on a continuous optimization side pressure strategy is provided, the method comprising:

[0025] Using steel type, billet thickness, billet width, finished product thickness and total lateral pressure as indexes, multiple maximum lateral pressure value strategies are preset for each type of steel;

[0026] Before rough rolling, a maximum side pressure value strategy is selected from multiple preset maximum side pressure value strategies according to the steel type, actual side pressure demand and rough rolling width requirement, and the number of rolling passes and the side pressure amount of each pass are determined according to the selected maximum side pressure value strategy;

[0027] During the rough rolling process, based on the selected number of rolling passes and the side pressure of each pass, the side pressure of the subsequent pass is corrected and adjusted according to the actual rough rolling width measured after the previous pass.

[0028] In some optional implementations, four maximum lateral pressure value strategies are preset for each type of steel.

[0029] In some optional embodiments, steel type, billet thickness, billet width, finished product thickness, and total lateral pressure are used as indexes, and each index corresponds to 4 plan numbers. Each plan number corresponds to a maximum lateral pressure value strategy, and the 4 plan numbers correspond to four maximum lateral pressure value strategies. Each plan number includes the number of passes and the maximum lateral pressure of each pass.

[0030] In some optional implementations, the plan number values ​​corresponding to each steel grade are set to:

[0031]

[0032]

[0033] The number of passes corresponding to each plan number and the maximum lateral pressure value of each pass are set as follows:

[0034]

[0035]

[0036] When the value of the total lateral pressure is a range value, the value of the total lateral pressure includes the lower boundary value and excludes the upper boundary value.

[0037] In some optional implementations, when selecting a maximum lateral pressure value strategy from multiple preset maximum lateral pressure value strategies, calculation is first performed according to a first maximum lateral pressure value strategy. If the first maximum lateral pressure value strategy can meet the width requirement, the first maximum lateral pressure value strategy is selected. If the first maximum lateral pressure value strategy cannot meet the width requirement, calculation is performed according to a second maximum lateral pressure value strategy.

[0038] If the second maximum lateral pressure value determination strategy can meet the width requirement, the second maximum lateral pressure value determination strategy is selected; if the second maximum lateral pressure value determination strategy cannot meet the width requirement, the third maximum lateral pressure value determination strategy is used for calculation;

[0039] If the third maximum lateral pressure value selection strategy can meet the width requirement, the third maximum lateral pressure value selection strategy is selected; if the third maximum lateral pressure value selection strategy cannot meet the width requirement, the fourth maximum lateral pressure value selection strategy is selected.

[0040] In some optional embodiments, when selecting a maximum side pressure value strategy from a plurality of preset maximum side pressure value strategies, a calculation is performed based on the number of passes and the maximum side pressure in the first maximum side pressure value strategy to determine a calculation result of the roughing final pass outlet width. When the calculated value of the roughing final pass outlet width minus the target value of the roughing final pass outlet width is ≤3 mm, it is determined that the width requirement is met and the first maximum side pressure value strategy is selected. Otherwise, it is determined that the width requirement is not met and the next step is executed.

[0041] The calculation result of the roughing final pass outlet width is determined based on the number of passes and the maximum side pressure in the second maximum side pressure value selection strategy. When the calculated value of the roughing final pass outlet width minus the target value of the roughing final pass outlet width is ≤3mm, it is determined that the width requirement is met and the second maximum side pressure value selection strategy is selected. Otherwise, it is determined that the width requirement is not met and the next step is executed.

[0042] The calculation result of the roughing final pass outlet width is determined based on the number of passes and the maximum side pressure in the third maximum side pressure value selection strategy. When the calculated value of the roughing final pass outlet width minus the target value of the roughing final pass outlet width is ≤3mm, it is determined that the width requirement is met and the third maximum side pressure value selection strategy is selected. Otherwise, it is determined that the width requirement is not met and the next step is executed.

[0043] The calculation result of the width of the last roughing pass outlet is determined according to the number of passes and the maximum side pressure in the fourth maximum side pressure value selection strategy. When the calculated value of the width of the last roughing pass outlet - the target value of the width of the last roughing pass outlet is ≤3mm, it is determined that the width requirement is met and the fourth maximum side pressure value selection strategy is selected. Otherwise, it is determined that the width requirement is not met and the fourth maximum side pressure value selection strategy is still selected.

[0044] In some optional implementations, the side pressure of the subsequent pass is corrected and adjusted according to the actual rough rolling width measured after the previous pass, including:

[0045] After each odd pass is completed, the width of the current odd pass outlet is measured using the width gauge at the rough rolling outlet. The average width of the first 1 / 3 of the strip at the current odd pass outlet is used as the current odd pass outlet width. The obtained current odd pass outlet width is used as the width benchmark for calculating the lateral pressure amount, and the lateral pressure amount of subsequent passes is corrected and adjusted.

[0046] The main advantages of the technical solution of the present invention are as follows:

[0047] The rolling width control method based on the continuous optimization of the side pressure strategy of the present invention presets multiple maximum side pressure value strategies for each type of steel, and continuously corrects the selected side pressure according to the actual rolling conditions of the strip. It can obtain the side pressure corresponding to the highest width control accuracy on the basis of considering the side pressure to be as small as possible, thereby improving the rolling width control accuracy. Under the premise of ensuring rolling stability and equipment safety, it can achieve the purpose of greatly improving the width control accuracy through continuous optimization of the pass number and the side pressure amount, can greatly reduce the over-width and negative width ratio, and significantly improve the finished product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0049] Figure 1 This is a schematic diagram of the equipment layout of an existing 1549mm hot rolling production line;

[0050] Figure 2 A flowchart of a rolling width control method based on continuous optimization of side pressure strategy provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0053] refer to Figure 2 The embodiment of the present invention provides a rolling width control method based on a continuous optimization side pressure strategy, which is used in a 1549mm hot rolling production line and includes the following steps:

[0054] Using steel type, billet thickness, billet width, finished product thickness and total lateral pressure as indexes, multiple maximum lateral pressure value strategies are preset for each type of steel;

[0055] Before rough rolling, a maximum side pressure value strategy is selected from multiple preset maximum side pressure value strategies according to the steel type, actual side pressure demand and rough rolling width requirement, and the number of rolling passes and the side pressure amount of each pass are determined according to the selected maximum side pressure value strategy;

[0056] During the rough rolling process, based on the selected number of rolling passes and the side pressure of each pass, the side pressure of the subsequent pass is corrected and adjusted according to the actual rough rolling width measured after the previous pass.

[0057] The rolling width control method based on the continuous optimization of the side pressure strategy provided by the embodiment of the present invention presets multiple maximum side pressure value strategies for each type of steel, and continuously corrects the selected side pressure according to the actual rolling conditions of the strip. It can obtain the side pressure corresponding to the highest width control accuracy on the basis of considering the side pressure to be as small as possible, thereby improving the rolling width control accuracy. Under the premise of ensuring rolling stability and equipment safety, it can achieve the purpose of greatly improving the width control accuracy through continuous optimization of the pass number and the side pressure amount, can greatly reduce the over-width and negative width ratio, and significantly improve the finished product yield.

[0058] Furthermore, in the embodiment of the present invention, four maximum lateral pressure value determination strategies are preset for each type of steel.

[0059] Specifically, in an embodiment of the present invention, steel type, billet thickness, billet width, finished product thickness, and total lateral pressure are used as indexes, and each index corresponds to 4 plan numbers. Each plan number corresponds to a maximum lateral pressure value-taking strategy, and the 4 plan numbers correspond to four maximum lateral pressure value-taking strategies. Each plan number includes the number of passes and the maximum lateral pressure of each pass.

[0060] In the embodiment of the present invention, the plan number values ​​corresponding to each steel grade are shown in the following table:

[0061] Table 1 The corresponding plan number value table for each steel grade

[0062]

[0063]

[0064] In Table 1, when the value of the total lateral pressure is a range value, the value of the total lateral pressure includes the lower boundary value but excludes the upper boundary value, that is, "47~57" means "47≤total lateral pressure<57".

[0065] In the embodiment of the present invention, the number of passes corresponding to each plan number and the maximum lateral pressure value of each pass are shown in the following table:

[0066] Table 2 The number of passes corresponding to each plan number and the maximum lateral pressure value of each pass

[0067]

[0068]

[0069] According to Table 1 and Table 2 set above, it can be seen that under the same number of passes, the maximum lateral pressure in the four plan numbers corresponding to each index gradually increases.

[0070] Further, in an embodiment of the present invention, based on the four maximum lateral pressure value-taking strategies set above, when selecting a maximum lateral pressure value-taking strategy from multiple preset maximum lateral pressure value-taking strategies, calculation is first performed according to the first maximum lateral pressure value-taking strategy. If the first maximum lateral pressure value-taking strategy can meet the width requirement, the first maximum lateral pressure value-taking strategy is selected. If the first maximum lateral pressure value-taking strategy cannot meet the width requirement, calculation is performed according to the second maximum lateral pressure value-taking strategy; if the second maximum lateral pressure value-taking strategy can meet the width requirement, the second maximum lateral pressure value-taking strategy is selected. If the second maximum lateral pressure value-taking strategy cannot meet the width requirement, calculation is performed according to the third maximum lateral pressure value-taking strategy; if the third maximum lateral pressure value-taking strategy can meet the width requirement, the third maximum lateral pressure value-taking strategy is selected. If the third maximum lateral pressure value-taking strategy cannot meet the width requirement, the fourth maximum lateral pressure value-taking strategy is selected.

[0071] In an embodiment of the present invention, based on the four maximum lateral pressure value-taking strategies set, when each strip rolling is performed, the maximum lateral pressure value-taking strategy is selected using the above-mentioned gradient calculation method, which can ensure that the selected maximum lateral pressure meets the rolling width control accuracy requirements, can greatly reduce the over-width and negative width ratio, and significantly improve the finished product yield.

[0072] Furthermore, in an optional implementation of the embodiment of the present invention, when selecting a maximum side pressure value strategy from a plurality of preset maximum side pressure value strategies, a calculation is performed based on the number of passes and the maximum side pressure in the first maximum side pressure value strategy to determine the calculation result of the roughing final pass outlet width. When the calculated value of the roughing final pass outlet width minus the target value of the roughing final pass outlet width is ≤3 mm, it is determined that the width requirement is met and the first maximum side pressure value strategy is selected. Otherwise, it is determined that the width requirement is not met and the next step is executed.

[0073] The calculation result of the roughing final pass outlet width is determined based on the number of passes and the maximum side pressure in the second maximum side pressure value selection strategy. When the calculated value of the roughing final pass outlet width minus the target value of the roughing final pass outlet width is ≤3mm, it is determined that the width requirement is met and the second maximum side pressure value selection strategy is selected. Otherwise, it is determined that the width requirement is not met and the next step is executed.

[0074] The calculation result of the roughing final pass outlet width is determined based on the number of passes and the maximum side pressure in the third maximum side pressure value selection strategy. When the calculated value of the roughing final pass outlet width minus the target value of the roughing final pass outlet width is ≤3mm, it is determined that the width requirement is met and the third maximum side pressure value selection strategy is selected. Otherwise, it is determined that the width requirement is not met and the next step is executed.

[0075] The calculation result of the width of the last roughing pass outlet is determined according to the number of passes and the maximum side pressure in the fourth maximum side pressure value selection strategy. When the calculated value of the width of the last roughing pass outlet - the target value of the width of the last roughing pass outlet is ≤3mm, it is determined that the width requirement is met and the fourth maximum side pressure value selection strategy is selected. Otherwise, it is determined that the width requirement is not met and the fourth maximum side pressure value selection strategy is still selected.

[0076] In an embodiment of the present invention, four corresponding plan numbers are determined according to the steel type, billet thickness, billet width, finished product thickness and total lateral pressure corresponding to the rolled strip. The first plan number corresponds to the first maximum lateral pressure value taking strategy, the second plan number corresponds to the second maximum lateral pressure value taking strategy, the third plan number corresponds to the third maximum lateral pressure value taking strategy, and the fourth plan number corresponds to the fourth maximum lateral pressure value taking strategy.

[0077] Furthermore, since width gauges are usually installed only at the exits of odd passes in rough rolling, in an embodiment of the present invention, the side pressure of subsequent passes is corrected and adjusted based on the actual rough rolling width measured after the previous pass, further comprising the following steps:

[0078] After each odd pass is completed, the width of the current odd pass outlet is measured using the width gauge at the rough rolling outlet. The average width of the first 1 / 3 of the strip at the current odd pass outlet is used as the current odd pass outlet width. The obtained current odd pass outlet width is used as the width benchmark for calculating the lateral pressure amount, and the lateral pressure amount of subsequent passes is corrected and adjusted.

[0079] To make the above technical solution of the present invention clearer, the technical solution of the present invention will be described clearly and completely in conjunction with specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0080] Example 1

[0081] This embodiment rolls ordinary carbon steel, steel coil number: 948002503, steel grade: Q195L; blank thickness 230mm, blank width 1275mm, finished product thickness 2.95mm, finished product target width 1225mm, user requirements according to 1230 ~ 1240mm supply.

[0082] Calculate the total side pressure = blank width - finished product width = 1275-1225 = 50 (mm).

[0083] The target value for finished product width control is 1235mm, and the target value for the final rough rolling exit width is calculated to be 1263mm.

[0084] According to Table 1, the plan numbers selected are 151, 152, 170, and 171.

[0085] The process of obtaining the values ​​of the number of passes and the lateral pressure is as follows:

[0086] 1) Select plan number 151. According to Table 2, the number of passes is 5. The maximum side pressure (mm) of the 1st, 3rd, and 5th passes is 50, 81, and 30 respectively. Calculate the rough rolling width. The results are as follows:

[0087]

[0088] The calculated result of the roughing last pass exit width is judged. The calculated value of the roughing last pass exit width - the target value of the roughing last pass exit width = 1274 - 1263 = 11 (mm) > 3mm. If the width requirement is not met, select plan number 152 to recalculate.

[0089] 2) Select plan number 152. According to Table 2, the number of passes is 5. The maximum side pressure (mm) of the 1st, 3rd, and 5th passes is 53, 87, and 35 respectively. Calculate the rough rolling width. The results are as follows:

[0090]

[0091] The calculated result of the roughing last pass exit width is judged. The calculated value of the roughing last pass exit width - the target value of the roughing last pass exit width = 1269 - 1263 = 6 (mm) > 3mm. If the width requirement is not met, select plan number 170 to recalculate.

[0092] 3) Select plan number 170. According to Table 2, the number of passes is 7. The maximum side pressure (mm) of the 1st, 3rd, 5th, and 7th passes is 45, 75, 50, and 25 respectively. Calculate the rough rolling width. The results are as follows:

[0093]

[0094] The calculation result of the width of the last roughing pass outlet is judged. The calculated value of the width of the last roughing pass outlet - the target value of the width of the last roughing pass outlet = 1263 - 1263 = 0 (mm) < 3mm. If the width requirement is met, plan number 170 is selected as the maximum side pressure value strategy.

[0095] During the rolling process, after each odd pass is completed, when the first 1 / 3 of the strip at the pass exit is detected, the average width measurement of the first 1 / 3 of the strip is used as the width reference for calculating the side pressure, replacing the original width calculation value. The side pressure of the subsequent passes is recalculated until the last pass. The specific control parameters during the rolling process are as follows:

[0096]

[0097]

[0098] Through continuous correction calculation based on the measured values ​​during the rolling process, the rolling is stable. The measured value of the outlet width of the last pass of rough rolling is 1263mm, which is consistent with the target value of 1263mm. The measured value of the finished product width is 1234mm, which is 1mm different from the target value of 1235mm, meeting user requirements.

[0099] Example 2

[0100] This embodiment rolls low alloy structural steel, steel coil number: 948091403, steel grade: HP295; blank thickness 230mm, blank width 1355mm, finished product thickness 3.5mm, finished product target width 1310mm, user requirements according to 1315 ~ 1325mm supply.

[0101] Calculate the total side pressure = blank width - finished product width = 1355-1310 = 45 (mm).

[0102] The target value for finished product width control is 1320mm, and the target value for the final rough rolling exit width is calculated to be 1354mm.

[0103] According to Table 1, the plan numbers selected are 350, 351, 352, and 370.

[0104] The process of obtaining the values ​​of the number of passes and the lateral pressure is as follows:

[0105] 1) Select plan number 350. According to Table 2, the number of passes is 5. The maximum side pressure (mm) of the 1st, 3rd, and 5th passes is 47, 78, and 27 respectively. Calculate the rough rolling width. The results are as follows:

[0106]

[0107] The calculated result of the roughing last pass exit width is judged. The calculated value of the roughing last pass exit width - the target value of the roughing last pass exit width = 1368 - 1354 = 14 (mm) > 3mm. If the width requirement is not met, select plan number 351 to recalculate.

[0108] 2) Select plan number 351. According to Table 2, the number of passes is 5. The maximum side pressure (mm) of the 1st, 3rd, and 5th passes is 52, 83, and 30 respectively. Calculate the rough rolling width. The results are as follows:

[0109]

[0110]

[0111] The calculated result of the roughing last pass exit width is judged. The calculated value of the roughing last pass exit width - the target value of the roughing last pass exit width = 1363 - 1354 = 9 (mm) > 3mm. If the width requirement is not met, select plan number 352 to recalculate.

[0112] 3) Select plan number 352. According to Table 2, the number of passes is 5. The maximum side pressure (mm) of the 1st, 3rd, and 5th passes is 55, 90, and 35 respectively. Calculate the rough rolling width. The results are as follows:

[0113]

[0114] The calculation result of the width of the last roughing pass outlet is judged. The calculated value of the width of the last roughing pass outlet - the target value of the width of the last roughing pass outlet = 1355-1354 = 1 (mm) < 3mm. If the width requirement is met, plan number 352 is selected as the maximum side pressure value strategy.

[0115] During the rolling process, after each odd pass is completed, when the first 1 / 3 of the strip at the pass exit is detected, the average width measurement of the first 1 / 3 of the strip is used as the width reference for calculating the side pressure, replacing the original width calculation value. The side pressure of the subsequent passes is recalculated until the last pass. The specific control parameters during the rolling process are as follows:

[0116]

[0117] Through continuous correction calculation based on the measured values ​​during the rolling process, the rolling is stable. The measured value of the outlet width of the last pass of rough rolling is 1355mm, which is 1mm different from the target value of 1354mm. The measured value of the finished product width is 1322mm, which is 2mm different from the target value of 1320mm, meeting user requirements.

[0118] Example 3

[0119] This embodiment rolls high-strength steel, steel coil number: 948054806, steel type: TSJ-33; billet thickness 230mm, billet width 1130mm, finished product thickness 3.4mm, finished product target width 1070mm, user requirements according to 1075 ~ 1085mm supply.

[0120] Calculate the total side pressure = blank width - finished product width = 1130-1070 = 60 (mm).

[0121] The target value for finished product width control is 1080mm, and the target value for the final rough rolling exit width is calculated to be 1105mm.

[0122] According to Table 1, the plan numbers selected are 452, 470, 471, and 472.

[0123] The process of obtaining the values ​​of the number of passes and the lateral pressure is as follows:

[0124] 1) Select plan number 452. According to Table 2, the number of passes is 5. The maximum side pressure (mm) of the 1st, 3rd, and 5th passes is 60, 90, and 35 respectively. Calculate the rough rolling width. The results are as follows:

[0125]

[0126] The calculated result of the roughing last pass exit width is judged. The calculated value of the roughing last pass exit width - the target value of the roughing last pass exit width = 1121 - 1105 = 16 (mm) > 3mm. If the width requirement is not met, select plan number 470 to recalculate.

[0127] 2) Select 470 plan number, according to Table 2, the pass number is 7, the maximum side pressure amount (mm) of the 1st, 3rd, 5th, 7th pass is 53, 85, 52, 30 respectively, rough rolling width calculation is carried out, the calculation result is as follows:

[0128]

[0129] The calculation result of the rough rolling last pass exit width is judged, the calculation value of the rough rolling last pass exit width-the target value of the rough rolling last pass exit width = 1117-1105 = 12 (mm) > 3 mm, the width requirement is not met, then 471 plan number is selected to recalculate;

[0130] 3) Select 471 plan number, according to Table 2, the pass number is 7, the maximum side pressure amount (mm) of the 1st, 3rd, 5th, 7th pass is 55, 87, 57, 32 respectively, rough rolling width calculation is carried out, the calculation result is as follows:

[0131]

[0132]

[0133] The calculation result of the rough rolling last pass exit width is judged, the calculation value of the rough rolling last pass exit width-the target value of the rough rolling last pass exit width = 1110-1105 = 5 (mm) > 3 mm, the width requirement is not met, then 472 plan number is selected to recalculate;

[0134] 4) Select 472 plan number, according to Table 2, the pass number is 7, the maximum side pressure amount (mm) of the 1st, 3rd, 5th, 7th pass is 60, 90, 61, 35 respectively, rough rolling width calculation is carried out, the calculation result is as follows:

[0135]

[0136] The calculation result of the rough rolling last pass exit width is judged, the calculation value of the rough rolling last pass exit width-the target value of the rough rolling last pass exit width = 1105-1105 = 0 (mm) < 3 mm, the width requirement is met, then 472 plan number is selected as the maximum side pressure amount value selection strategy.

[0137] In the rolling process, after each odd pass rolling is completed, when the front 1 / 3 of the pass exit strip is detected, the width measurement average of the front 1 / 3 strip is taken as the width reference for calculating the side pressure amount, replacing the original width calculation value, the side pressure amount of the subsequent passes is recalculated, until the last pass, the specific control parameters in the rolling process are as follows:

[0138]

[0139] Through continuous correction calculation based on the measured values ​​during the rolling process, the rolling is stable. The measured value of the outlet width of the last pass of rough rolling is 1104mm, which is 1mm different from the target value of 1105mm. The measured value of the finished product width is 1080mm, which is consistent with the target value of 1080mm, meeting user requirements.

[0140] Example 4

[0141] This embodiment rolls low-grade silicon steel, steel coil number: 948524403, steel type: DW130; billet thickness 222mm, billet width 1250mm, finished product thickness 2.6mm, finished product target width 1227mm, user requirements according to 1237 ~ 1247mm supply.

[0142] The target thickness of rough rolling is 47mm.

[0143] Calculate the total side pressure = blank width - finished product width = 1250-1227 = 23 (mm).

[0144] The target value for finished product width control is 1242mm, and the target value for the final rough rolling exit width is calculated to be 1271mm.

[0145] According to Table 1, the plan numbers selected are 550, 551, 552, and 570.

[0146] The process of obtaining the values ​​of the number of passes and the lateral pressure is as follows:

[0147] 1) Select plan number 550. According to Table 2, the number of passes is 5. The maximum side pressure (mm) of the 1st, 3rd, and 5th passes is 5, 30, and 18 respectively. Calculate the rough rolling width. The results are as follows:

[0148]

[0149] The calculated result of the roughing last pass exit width is judged. The calculated value of the roughing last pass exit width - the target value of the roughing last pass exit width = 1275 - 1271 = 4 (mm) > 3mm. If the width requirement is not met, select plan number 551 to recalculate.

[0150] 2) Select plan number 551. According to Table 2, the number of passes is 5. The maximum side pressure (mm) of the 1st, 3rd, and 5th passes is 5, 40, and 20 respectively. Calculate the rough rolling width. The results are as follows:

[0151]

[0152] The calculation results of the width of the last roughing pass outlet are judged. The calculated value of the width of the last roughing pass outlet - the target value of the width of the last roughing pass outlet = 1271 - 1271 = 0 (mm) < 3mm. If the width requirement is met, plan number 551 is selected as the maximum side pressure value strategy.

[0153] During the rolling process, after each odd pass is completed, when the first 1 / 3 of the strip at the pass exit is detected, the average width measurement of the first 1 / 3 of the strip is used as the width reference for calculating the side pressure, replacing the original width calculation value. The side pressure of the subsequent passes is recalculated until the last pass. The specific control parameters during the rolling process are as follows:

[0154]

[0155] Through continuous correction calculation based on the measured values ​​during the rolling process, the rolling is stable. The measured value of the outlet width of the last pass of rough rolling is 1272mm, which is 1mm different from the target value of 1271mm. The measured value of the finished product width is 1242mm, which is equal to the target value of 1242mm, meeting user requirements.

[0156] Example 5

[0157] This embodiment rolls high-grade silicon steel, steel coil number: 948428816, steel type: DV19A; billet thickness 222mm, billet width 1300mm, finished product thickness 2.3mm, finished product width target 1285mm, user requirements according to 1295 ~ 1305mm supply.

[0158] The target thickness of rough rolling is 40mm.

[0159] Calculate the total side pressure = blank width - finished product width = 1300-1285 = 15 (mm).

[0160] The target value for finished product width control is 1300mm, and the target value for the final rough rolling exit width is calculated to be 1324mm.

[0161] According to Table 1, the plan numbers selected are 651, 652, 653, and 670.

[0162] The process of obtaining the values ​​of the number of passes and the lateral pressure is as follows:

[0163] 1) Select plan number 651. According to Table 2, the number of passes is 5. The maximum side pressure (mm) of the 1st, 3rd, and 5th passes is 7, 45, and 20 respectively. Calculate the rough rolling width. The results are as follows:

[0164]

[0165] The calculation results of the width of the roughing last pass outlet are judged. The calculated value of the width of the roughing last pass outlet - the target value of the width of the roughing last pass outlet = 1324 - 1324 = 0 (mm) < 3mm. If the width requirement is met, plan number 651 is selected as the maximum side pressure value strategy.

[0166] During the rolling process, after each odd pass is completed, when the first 1 / 3 of the strip at the pass exit is detected, the average width measurement of the first 1 / 3 of the strip is used as the width reference for calculating the side pressure, replacing the original width calculation value. The side pressure of the subsequent passes is recalculated until the last pass. The specific control parameters during the rolling process are as follows:

[0167]

[0168] Through continuous correction calculation based on the measured values ​​during the rolling process, the rolling is stable. The measured value of the outlet width of the last pass of rough rolling is 1324mm, which is equal to the target value of 1324mm. The measured value of the finished product width is 1302mm, which is 2mm different from the target value of 1300mm, meeting user requirements.

[0169] It can be seen that the rolling width control method based on the continuous optimization of the side pressure strategy provided by the embodiment of the present invention can improve the rolling width control accuracy, greatly reduce the overwidth and negative width ratio, and significantly improve the finished product yield.

[0170] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this document are all referenced to the placement states shown in the accompanying drawings.

[0171] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A rolling width control method based on continuous optimization of side pressure strategy, characterized in that: include: With steel type, billet thickness, billet width, finished product thickness and total lateral pressure as indexes, four maximum lateral pressure value strategies are preset for each type of steel; Before rough rolling, a maximum side pressure value strategy is selected from multiple preset maximum side pressure value strategies according to the steel type, actual side pressure demand and rough rolling width requirement, and the number of rolling passes and the side pressure amount of each pass are determined according to the selected maximum side pressure value strategy; During the rough rolling process, based on the selected number of rolling passes and the side pressure of each pass, the side pressure of the subsequent passes is corrected and adjusted according to the actual rough rolling width measured after the previous pass; With steel type, billet thickness, billet width, finished product thickness, and total side pressure as indexes, each index corresponds to 4 plan numbers, each plan number corresponds to a maximum side pressure value strategy, and the 4 plan numbers correspond to four maximum side pressure value strategies. Each plan number includes the number of passes and the maximum side pressure of each pass. The plan number values ​​corresponding to each steel grade are set as: ； The number of passes corresponding to each plan number and the maximum lateral pressure value of each pass are set as follows: ； When the value of the total lateral pressure is a range value, the value of the total lateral pressure includes the lower boundary value and excludes the upper boundary value.

2. The rolling width control method based on continuous optimization of side pressure strategy according to claim 1 is characterized in that: When selecting a maximum lateral pressure value strategy from multiple preset maximum lateral pressure value strategies, first calculate according to the first maximum lateral pressure value strategy. If the first maximum lateral pressure value strategy can meet the width requirement, then the first maximum lateral pressure value strategy is selected. If the first maximum lateral pressure value strategy cannot meet the width requirement, then calculate according to the second maximum lateral pressure value strategy. If the second maximum lateral pressure value determination strategy can meet the width requirement, the second maximum lateral pressure value determination strategy is selected; if the second maximum lateral pressure value determination strategy cannot meet the width requirement, the third maximum lateral pressure value determination strategy is used for calculation; If the third maximum lateral pressure value selection strategy can meet the width requirement, the third maximum lateral pressure value selection strategy is selected; if the third maximum lateral pressure value selection strategy cannot meet the width requirement, the fourth maximum lateral pressure value selection strategy is selected.

3. The rolling width control method based on continuous optimization of side pressure strategy according to claim 1 is characterized in that: When selecting a maximum side pressure value strategy from multiple preset maximum side pressure value strategies, the calculation result of the roughing final pass outlet width is determined based on the number of passes and the maximum side pressure in the first maximum side pressure value strategy. When the calculated value of the roughing final pass outlet width minus the target value of the roughing final pass outlet width is ≤3mm, it is determined that the width requirement is met and the first maximum side pressure value strategy is selected. Otherwise, it is determined that the width requirement is not met and the next step is executed. The calculation result of the roughing final pass outlet width is determined based on the number of passes and the maximum side pressure in the second maximum side pressure value selection strategy. When the calculated value of the roughing final pass outlet width minus the target value of the roughing final pass outlet width is ≤3mm, it is determined that the width requirement is met and the second maximum side pressure value selection strategy is selected. Otherwise, it is determined that the width requirement is not met and the next step is executed. The calculation result of the roughing final pass outlet width is determined based on the number of passes and the maximum side pressure in the third maximum side pressure value selection strategy. When the calculated value of the roughing final pass outlet width minus the target value of the roughing final pass outlet width is ≤3mm, it is determined that the width requirement is met and the third maximum side pressure value selection strategy is selected. Otherwise, it is determined that the width requirement is not met and the next step is executed. The calculation result of the width of the last roughing pass outlet is determined according to the number of passes and the maximum side pressure in the fourth maximum side pressure value selection strategy. When the calculated value of the width of the last roughing pass outlet - the target value of the width of the last roughing pass outlet is ≤3mm, it is determined that the width requirement is met and the fourth maximum side pressure value selection strategy is selected. Otherwise, it is determined that the width requirement is not met and the fourth maximum side pressure value selection strategy is still selected.

4. The rolling width control method based on continuous optimization of side pressure strategy according to claim 1 is characterized in that: The side pressure of the subsequent passes is corrected and adjusted based on the actual rough rolling width measured after the previous pass, including: After each odd pass is completed, the width of the current odd pass outlet is measured using the width gauge at the rough rolling outlet. The average width of the first 1 / 3 of the strip at the current odd pass outlet is used as the current odd pass outlet width. The obtained current odd pass outlet width is used as the width benchmark for calculating the lateral pressure amount, and the lateral pressure amount of subsequent passes is corrected and adjusted.

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