Automatic control method for coiling tension of silicon steel shearing unit

Abstract

The invention belongs to the technical field of cold-rolled strip steel shearing control, and provides a silicon steel shearing unit coiling tension automatic control method which comprises the steps that S1, a coiling tension preset value preset strategy is compiled for silicon steel according to the strip steel incoming material thickness and the finished product width, and an automatic tension matching model and a taper control model are established; s2, optimizing a current tension preset value by using an automatic tension matching model; s3, outputting a tension taper coefficient in real time according to the actual value of the coiling diameter of the steel coil by using the taper control model; s4, according to the real-time actual rolling diameter value, the tension taper coefficient and the tension preset value, a motor torque set value dynamically changing along with the actual rolling diameter value is output; strict execution of coiling tension technologies of different strip steel products is ensured, and the problems that the electromagnetic performance of a steel plate is degraded due to the fact that the coiling tension of the shearing procedure is too large, and coil collapse is caused due to insufficient tension are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automatic control of cold-rolled strip shearing units, and relates to the coiling tension control of cold-rolled strip shearing units. Specifically, it is an automatic coiling tension control method for silicon steel shearing units. Background Art

[0002] The tension control of cold-rolled silicon steel shearing units is a key factor in ensuring the quality of strip steel products. Precise and stable strip steel tension is a necessary condition for ensuring the quality of finished steel coils and stabilizing various performance indicators. Tension control is divided into two forms: direct tension control and indirect tension control. Indirect tension control is mostly used for the pay-off and reeling of cold-rolled shearing units.

[0003] Generally, there are two ways of indirect tension control: one is achieved through torque limiting, and the other is to adjust the set speed of the drive device according to the deviation between the tension set value and the actual value (the feedback value obtained through calculation). The pay-off (reeling) adopts the first way, and the tension roll adopts the second way.

[0004] Indirect tension control does not require a tension measuring device, and there is no tension regulator in the control system. The tension set value is multiplied by the actual value of the coil diameter to obtain the torque limit value, which linearly changes with the change of the coil diameter. The speed regulator maintains the output limit state through a saturation setting, that is, the torque limit control state. The motor torque current linearly changes with the change of the coil diameter to achieve constant tension control during the reeling (pay-off) process.

[0005] The original design of the unit is the total tension setting method, which is manually preset by operators through the HMI system. In the initial stage of production, the variety specifications of the products put into production were relatively single, and the operators always used a coiling tension setting of 12 KN with very few changes. However, with the rapid development of the new energy industry, the product varieties and specifications show a trend of diversification and personalization. According to the process requirements, the coiling tension set value should be continuously adjusted according to different varieties and specifications, and the manual preset method cannot adapt to the high-frequency process changes.

[0006] Since the unit was put into production, quality problems have occurred frequently due to improper tension parameter settings. The main manifestations are as follows: 1. The electromagnetic performance deteriorates and the insulating coating on the steel plate surface is damaged due to excessive coiling tension; 2. Inner convex and folding defects are formed in the inner core of the steel coil due to excessive coiling tension; 3. The problem of large residual curvature of the inner ring steel plate due to excessive coiling tension; 4. Problems such as inner ring collapse of the steel coil and uneven end face coiling due to too small coiling tension.

[0007] In response to the above problems, all factors affecting the coiling tension value are classified and evaluated, an empirical coefficient scoring table is designed, scored in combination with the product characteristics, and the empirical coefficient value ranges for medium-low, high, and ultra-high grade products are divided. Then, based on the unit tension value of the typical product in the original design of the unit, the total coiling tension values of products of various grades and specifications are deduced. After repeated experiments, the best value range is selected to form the coiling tension value-taking strategy for products of different varieties and specifications.

[0008] To ensure the effective implementation of the tension process, a tension automatic matching model is developed in the basic automation system to complete the automatic setting and distribution of the coiling tension, so as to improve production efficiency and reduce product defects caused by improper coiling tension control. Summary of the Invention

[0009] The purpose of the present invention is to provide an automatic coiling tension control method for a silicon steel shearing unit, which can realize the automatic matching and distribution of the coiling tension value of the unit, improve the timeliness and accuracy of the unit in implementing the process, and eliminate quality defects caused by improper tension setting.

[0010] The technical solution adopted by the present invention to achieve the above purpose is: An automatic coiling tension control method for a silicon steel shearing unit, comprising: S1. Calculate the unit tension reference value, design an empirical coefficient scoring table, formulate a coiling tension preset value taking strategy for various product combinations based on the grade, thickness of the incoming material and the width of the finished product after shearing, and develop a tension automatic matching model; S2. Use the tension automatic matching model to optimize the current tension preset value; S3. Develop a taper control model and output the tension taper coefficient in real time according to the actual value of the coiled diameter of the steel coil; S4. According to the actual value of the real-time coiled diameter, the tension taper coefficient and the tension preset value, convert and output the motor torque setting value that changes dynamically with the actual value of the coiled diameter.

[0011] Further, the coiling tension preset value taking strategy is: When the strip thickness is 0.65±2%mm, the tension preset value is 16kN; When the strip thickness is 0.5±2%mm and the width of the finished strip≥1100mm, the tension preset value is 12kN; When the strip thickness is 0.5±2%mm and the width of the finished strip<1100mm, the tension preset value is 11kN; When the strip thickness is 0.35±2.3%mm and the width of the finished strip≥1100mm, the tension preset value is 7kN; When the strip thickness is 0.35 ± 2.3% mm and the width of the finished strip is < 1100 mm, the preset value of the tension is 6 kN; When the strip thickness is 0.3 ± 3% mm and the width of the finished strip ≥ 1100 mm, the preset value of the tension is 5 kN; When the strip thickness is 0.3 ± 3% mm and the width of the finished strip is < 1100 mm, the preset value of the tension is 4 kN; When the strip thickness is 0.27 ± 3% mm and the width of the finished strip ≥ 1100 mm, the preset value of the tension is 4.5 kN; When the strip thickness is 0.27 ± 3% mm and the width of the finished strip is < 1100 mm, the preset value of the tension is 3.5 kN; When the strip thickness is 0.25 ± 4% mm, the preset value of the tension is 4 kN; When the strip thickness is 0.2 ± 5% mm, the preset value of the tension is 3 kN.

[0012] Furthermore, the steps for determining the preset strategy of the coiling tension preset value are as follows: Step 1: According to the design process of the shearing unit and the basic formula of strip unit tension, calculate the unit tension value of typical products, σ = F / (b × h), where: F is the calculated total tension, unit: N; σ is the strip unit tension, unit: N / mm2; b is the strip width, unit: mm; h is the strip thickness, unit: mm; Step 2: Design an empirical coefficient scoring table, score all grades of products, and determine the value range of the empirical coefficient k1 for the three major categories of products: medium and low grades, high grades, and ultra-high grades; Step 3: Based on the unit tension determined in Step 1, calculate the calculated total tension for different specifications of each variety; The formula for calculating the total tension is: F = k1 × σ × b × h, where: k1 is the empirical coefficient, F is the calculated total tension, unit: N; σ is the strip unit tension, unit: N / mm2, b is the strip width, unit: mm; h is the strip thickness, unit: mm; Step 4: Calibrate and correct the coiling tension preset value: Based on the total tension calculated in Step 3, select strips of different specifications of typical grades for trial production, observe the material state, including shearing quality, surface coating, and inner ring warping, and gradually correct the calculated total tension in combination with the equipment capacity of the coiling tension of the drive system in the range of 3 - 16 KN to determine the minimum coiling tension setting value that does not cause inner ring collapse and strip deviation, that is, generate the final model tension preset value.

[0013] Further, according to the requirements of the thick coating product for the coiling tension, a tension fine-tuning program is added. Based on the preset tension value output by the tension automatic matching model, the preset tension value is increased or decreased manually to meet the special process requirements of niche products.

[0014] Further, the taper control model divides the coil diameter of the steel coil into 10 interval boundaries, and the calculation formula for the tension taper coefficient k2 is: k2 = (Y 上 - Y 下 )(D_act - X 下 ) / (X 上 - X 下 ) + Y 下 In the formula, D_act is the actual value of the real-time coil diameter, Y 上 is the tension taper coefficient of the upper interval boundary, Y 下 is the tension taper coefficient of the lower interval boundary, X 上 is the upper interval boundary of the coil diameter value, and X 下 is the lower interval boundary of the coil diameter value.

[0015] The upper and lower interval boundary values are selected according to the following table:

[0016] Further, the calculation formula for the motor torque set value M_motor is: M_motor = k2 * T_set * D_act / 2 * i In the formula, k2 is the tension taper coefficient, T_set is the preset tension value, D_act is the actual value of the real-time coil diameter, and i is the coiler transmission ratio.

[0017] The beneficial effects of the present invention are: The present invention can ensure the strict implementation of the coiling tension process for different strip products, avoid problems such as deterioration of the electromagnetic properties of the steel plate, powder falling off the surface coating, inner ring collapse of the coil, and uneven end faces caused by improper setting of the coiling tension in the shearing process, and reduce the residual curvature of the inner ring steel plate of medium and low grade steel coils by about 20%. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the flowchart of the method of the present invention; Figure 2 is the control flowchart of the present invention; Figure 3 is the empirical coefficient scoring table. DETAILED DESCRIPTION OF THE INVENTION

[0019] The present invention will be further described below with reference to the drawings: Such as Figure 1 andFigure 2 As shown in Figure 2 , an automatic control method for coiling tension of a silicon steel shearing unit includes: S1. Calculate the unit tension reference value, design an empirical coefficient scoring table, formulate a value-taking strategy for the coiling tension preset value under various product combinations based on the grade, thickness, and finished product width of the incoming material, and develop a tension automatic matching model; S2. Use the tension automatic matching model to optimize the current tension preset value; S3. Use the taper control model to output the tension taper coefficient in real time according to the actual value of the coiled diameter of the steel coil; S4. Calculate and output the motor torque setting value that dynamically changes with the actual value of the coiled diameter according to the actual value of the real-time coiled diameter, the tension taper coefficient, and the tension preset value.

[0020] The silicon steel shearing unit uses the PLC system to receive the current online steel coil information of the screening secondary automation system, determine the incoming material parameters in the interface data block, and use the PLC system program to determine the coiling tension preset value in combination with the coiling tension preset value preset strategy.

[0021] Among them, the coiling tension preset value preset strategy is as follows: When the strip thickness is 0.65 ± 2% mm, the tension preset value is 16 kN; When the strip thickness is 0.5 ± 2% mm and the finished strip width ≥ 1100 mm, the tension preset value is 12 kN; When the strip thickness is 0.5 ± 2% mm and the finished strip width < 1100 mm, the tension preset value is 11 kN; When the strip thickness is 0.35 ± 2.3% mm and the finished strip width ≥ 1100 mm, the tension preset value is 7 kN; When the strip thickness is 0.35 ± 2.3% mm and the finished strip width < 1100 mm, the tension preset value is 6 kN; When the strip thickness is 0.3 ± 3% mm and the finished strip width ≥ 1100 mm, the tension preset value is 5 kN; When the strip thickness is 0.3 ± 3% mm and the finished strip width < 1100 mm, the tension preset value is 4 kN; When the strip thickness is 0.27 ± 3% mm and the finished strip width ≥ 1100 mm, the tension preset value is 4.5 kN; When the strip thickness is 0.27 ± 3% mm and the finished strip width < 1100 mm, the tension preset value is 3.5 kN; When the strip thickness is 0.25 ± 4% mm, the tension preset value is 4 kN; When the strip thickness is 0.2 ± 5% mm, the tension preset value is 3 kN.

[0022] The strip raw material of the silicon steel shearing unit is cold-rolled non-oriented silicon steel after cold rolling and annealing coating processes. In actual production, the unit tension σ of cold-rolled non-oriented silicon steel needs to be adjusted according to material properties and process conditions.

[0023] The grade classification of cold-rolled silicon steel is mainly based on the silicon content. The silicon content determines the magnetic and mechanical properties of the material. Generally speaking, as the silicon content increases, the yield strength of cold-rolled silicon steel usually increases, but the relationship between them is not completely linear. Within a certain range, the increase in silicon content will lead to a significant increase in yield strength, but after the silicon content reaches a certain proportion, the increase amplitude of yield strength may decrease, which is related to the content of other elements in the material and the rolling and annealing processes. Therefore, we take the silicon content, yield strength, and material thickness as the main basis for taking values of empirical coefficients, and design an empirical coefficient scoring table in combination with material properties and process requirements. The scoring principles are as follows: 1. The higher the silicon content, the lower the toughness, and the lower the value of the empirical coefficient; 2. The higher the strip strength, the lower the value of the empirical coefficient; 3. The thinner the strip thickness, the higher the tension sensitivity, and the lower the value of the empirical coefficient; 4. The silicon steel has an insulating coating on the surface, and the surface quality requirements are relatively high, so the value of the empirical coefficient should be lower; 5. The higher the shearing speed, the lower the value of the empirical coefficient.

[0024] 6. The equipment capacity of the unit drive system determines the upper and lower limits of the coiling tension setting value. To ensure the tension control accuracy, the coiling tension setting should be within the capacity range of the unit equipment.

[0025] 7. The empirical coefficient needs to be dynamically adjusted according to material properties, equipment capacity, process requirements, and trial production data to ensure the stability of the shearing process and product quality.

[0026] The specific evaluation and scoring basis of the empirical coefficient is as Figure 3 shown in the empirical coefficient evaluation and scoring table. The full score is 100 points, and the empirical coefficient corresponding to the full score is 1.00. Assignment and scoring are carried out according to the weight ratio according to the silicon content range, material yield strength range, material thickness, surface quality requirements, shearing speed, and shearing accuracy; According to the empirical coefficient evaluation and scoring table, the value range of the final empirical coefficient k1 is as follows: The empirical coefficient k1 of medium and low grade silicon steel takes the value of 1; The empirical coefficient k1 of high grade silicon steel takes the value of 0.78 - 0.81; The empirical coefficient k1 of ultra-high grade silicon steel takes the value of 0.62 - 0.71; Therefore, the determination steps of the coiling tension preset value preset strategy are as follows: Step 1: Calculate the unit tension value of typical products according to the design process of the shearing unit and the basic formula of strip unit tension, σ = F / (b × h), where: F is the calculated total tension (unit: N), σ is the strip unit tension (unit: N / mm2), b is the strip width (unit: mm), and h is the strip thickness (unit: mm); Step 2: Design an empirical coefficient scoring table, score all product grades, and determine the value range of the empirical coefficient k1 for the three major categories of products, namely medium and low grades, high grades, and ultra-high grades; Step 3: Taking the unit tension determined in Step 1 as the reference value, calculate the calculated total tension of the three major categories of products with different specifications; The formula for calculating the calculated total tension is: F = k1 × σ × b × h, where: k1 is the empirical coefficient, F is the calculated total tension (unit: N), σ is the strip unit tension (unit: N / mm2), b is the strip width (unit: mm), and h is the strip thickness (unit: mm); Step 4: Calibrate the preset value of the coiling tension: Taking the total tension calculated in Step 3 as the reference, select strip steels with different specifications of typical grades of the three major categories of products for trial production, observe the material state (including shearing quality, surface coating damage, inner ring warping degree, etc.), and combine with the equipment capacity of the drive system (coiling tension 3 - 16 KN), gradually correct the calculated total tension, and determine the minimum coiling tension setting value that does not cause inner ring collapse, that is, generate the final model preset total tension, as shown in the following table.

[0027] 。

[0028] It should be noted here that during the slitting production of the unit, the width of the finished steel plate includes the width of the strip, and the coiling tension floats by 1 - 2 kN on the basis of the preset total tension.

[0029] In addition, according to the requirements of the thick coating of the strip on the coiling tension, a tension fine-tuning program is added. On the basis of the tension preset value output by the tension automatic matching model, the tension preset value is increased or decreased manually to meet the tension setting requirements of niche products.

[0030] Among them, the taper control model divides the coil diameter of the steel coil into 10 interval boundaries, reads the actual value of the current coil diameter, and judges which coil diameter interval it is located in. The corresponding relationship between the interval boundary coil diameter value and the corresponding tension taper coefficient is shown in the following table.

[0031]

[0032] The formula for outputting the tension taper coefficient k2 is: k2 = (Y 上 - Y 下 ) * (D_act - X 下 ) / (X上 -X 下 ) + Y 下 In the formula, D_act is the actual value of the real-time coil diameter, and Y 上 is the upper interval limit tension taper coefficient, and Y 下 is the lower interval limit tension taper coefficient, and X 上 is the upper interval limit of the coil diameter value, and X 下 is the lower interval limit of the coil diameter value; The upper and lower interval limit values are selected according to the above table; Then, calculate the motor torque set value to achieve automatic control of the coiling tension. The calculation formula for the motor torque set value M_motor is: M_motor = k2 * T_set * D_act / 2 * i In the formula, k2 is the tension taper coefficient, T_set is the tension preset value, D_act is the actual value of the real-time coil diameter, and i is the coiler reduction ratio.

Claims

1. An automatic control method for the coiling tension of a silicon steel shearing unit, characterized in that: Including: S1. According to the strip incoming material grade, thickness, and finished product width of silicon steel, formulate a preset strategy for the coiling tension preset value under various combinations, and establish a tension automatic matching model and a taper control model; S2. Use the tension automatic matching model to optimize the current tension preset value; S3. Use the taper control model to output the tension taper coefficient in real time according to the actual value of the coiled coil diameter of the steel coil; S4. According to the actual value of the real-time coil diameter, the tension taper coefficient, and the tension preset value, convert and output the motor torque setting value that changes dynamically with the actual value of the coil diameter.

2. The automatic control method for the coiling tension of a silicon steel shearing unit according to claim 1, wherein: The preset strategy for the coiling tension preset value is as follows: When the strip thickness is 0.65 ± 2% mm, the tension preset value is 16 kN; When the strip thickness is 0.5 ± 2% mm and the finished strip width ≥ 1100 mm, the tension preset value is 12 kN; When the strip thickness is 0.5 ± 2% mm and the finished strip width < 1100 mm, the tension preset value is 11 kN; When the strip thickness is 0.35 ± 2.3% mm and the finished strip width ≥ 1100 mm, the tension preset value is 7 kN; When the strip thickness is 0.35 ± 2.3% mm and the finished strip width < 1100 mm, the tension preset value is 6 kN; When the strip thickness is 0.3 ± 3% mm and the finished strip width ≥ 1100 mm, the tension preset value is 5 kN; When the strip thickness is 0.3 ± 3% mm and the finished strip width < 1100 mm, the tension preset value is 4 kN; When the strip thickness is 0.27 ± 3% mm and the finished strip width ≥ 1100 mm, the tension preset value is 4.5 kN; When the strip thickness is 0.27 ± 3% mm and the finished strip width < 1100 mm, the tension preset value is 3.5 kN; When the strip thickness is 0.25 ± 4% mm, the tension preset value is 4 kN; When the strip thickness is 0.2 ± 5% mm, the tension preset value is 3 kN.

3. The automatic control method for coiling tension of a silicon steel shearing unit according to claim 1, wherein: The determination steps of the preset strategy for the coiling tension preset value are as follows: Step 1. Calculate the unit tension value of typical products according to the design process of the shearing unit and the basic formula of strip unit tension, σ = F / (b × h), where: F is the calculated total tension, unit: N, σ is the strip unit tension, unit: N / mm2, b is the strip width, unit: mm, and h is the strip thickness, unit: mm; Step 2. Design an empirical coefficient scoring table, score all grade products, and determine the value range of the empirical coefficient k1 for the three major categories of medium-low grade, high grade, and ultra-high grade products; Step 3. Based on the unit tension determined in Step 1, calculate the calculated total tension of the three major categories of products with different specifications; The calculation formula for the calculated total tension is: F = k1 × σ × b × h, where: k1 is the empirical coefficient, F is the calculated total tension, unit: N, σ is the strip unit tension, unit: N / mm2, b is the strip width, unit: mm, and h is the strip thickness, unit: mm; Step 4. Calibrate the preset value of coiling tension: Based on the total tension calculated in Step 3, select strip steels of different specifications with typical grades of three major categories for trial production, and observe the material status, including shearing quality, surface coating, and inner ring warping. Combine the equipment capacity of the coiling tension of the drive system in the range of 3 - 16 KN, and gradually correct the calculated total tension to determine the minimum coiling tension setting value without inner ring collapse, that is, generate the final model tension preset value.

4. A method for automatically controlling the coiling tension of a silicon steel shearing unit according to claim 1, characterized in that: According to the special requirements of the slitting production mode and thick-coated products for coiling tension, an HMI manual tension fine-tuning function is added. Based on the tension preset value output by the tension automatic matching model, authorized process technicians can manually increase or decrease the tension preset value to meet the tension setting requirements in special situations.

5. A method for automatically controlling the coiling tension of a silicon steel shearing unit according to claim 1, characterized in that: The taper control model divides the coil diameter of the steel coil into 10 interval boundaries, and the calculation formula for the tension taper coefficient k is: k = (Y 上 - Y 下 )(D_act - X 下 ) / (X 上 - X 下 ) + Y 下 In the formula, D_act is the actual value of the real-time coil diameter, Y 上 is the upper interval boundary tension taper coefficient, Y 下 is the lower interval boundary tension taper coefficient, X 上 is the upper interval boundary of the coil diameter value, X 下 is the lower interval boundary of the coil diameter value; the upper interval boundary and lower interval boundary values are selected according to the following table: 。 6. The automatic control method for coiling tension of a silicon steel shearing unit according to claim 1, characterized in that: The calculation formula for the motor torque set value M_motor is: M_motor = k2 * T_set * D_act / 2 * i In the formula, k2 is the tension taper coefficient, T_set is the tension preset value, D_act is the actual value of the real-time coil diameter, and i is the reduction ratio of the coiler.

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