Method for iteratively adjusting cold continuous rolling reduction distribution and electronic equipment

Abstract

The invention provides a method for iteratively adjusting cold continuous rolling screw-down distribution and electronic equipment. The method comprises the steps that S1, the initial middle thickness of each rack in N racks is obtained, and N-1 racks except the Nth rack in the N racks are middle racks; s2, calculating a relative load coefficient between the middle racks; s3, according to the relative load coefficient, the preset maximum value and the preset minimum value of the relative load coefficient, and the maximum outlet thickness and the minimum outlet thickness of each middle rack in the iteration process, adjusting the outlet thickness of the middle rack; s4, converting the relative load coefficient into a unit distance, calculating the distance between the unit distance and a preset ideal value, and further calculating the root mean square of the distance; s5, when the root mean square is smaller than a preset value, ending circulation; otherwise, the maximum outlet thickness and the minimum outlet thickness of each middle rack are set as initial values, and the step S2 is executed. By means of the technical scheme, the calculation process of cold continuous rolling reduction distribution is simplified, and the cold rolling product quality is further improved.

Description

Technical Field

[0001] The invention relates to the field of steel cold rolling production, and in particular to a method for iteratively adjusting cold rolling reduction distribution and electronic equipment. Background Art

[0002] In the field of cold rolling, there are many reduction distribution schemes for rolling strip from a specified raw material thickness to a target finished product thickness. Traditional reduction distribution methods mainly include: empirical method and energy consumption curve method. The empirical method relies on the operator's experience and forms a standard rolling specification table based on factors such as strip material characteristics, incoming and finished product thickness, width, lubrication conditions, etc. However, this method is highly dependent on the operator's experience and it is difficult to ensure the optimization of reduction distribution. The energy consumption curve rule is based on the assumption that the energy consumption per unit mass is constant, the motor and moment arm coefficients are fixed, and the material deformation resistance increases with the number of rolling passes. The energy consumption curve is quantified through actual data to formulate a reduction distribution strategy. Although this method can give full play to the unit capacity, it requires a large amount of measured data and energy consumption is affected by many factors, which poses a challenge to new product development.

[0003] In recent years, the reduction distribution method based on rolling theory has become increasingly popular. This method solves the thickness distribution plan for each pass according to the thickness of the incoming material and the finished product, determines the reduction path by setting n-1 constraints (such as rolling force balance, power balance, etc.), and uses the Newton-Raphson method to solve the nonlinear equations. However, this method is computationally complex, very sensitive to the choice of initial values, and easily leads to calculation divergence. Summary of the invention

[0004] The embodiments of the present invention provide a method and electronic device for iteratively adjusting the pressure distribution of cold rolling. The method simplifies the calculation process of the pressure distribution of cold rolling, has strong feasibility, good convergence, fast calculation speed, and can produce according to the calculation results, further improving the quality of cold-rolled products, reducing strip breaks and shutdowns in production, and reducing equipment losses.

[0005] In order to achieve the above object, on the one hand, a method for iteratively adjusting the cold rolling reduction distribution is provided, the method comprising:

[0006] S1, obtaining the initial intermediate thickness of each rack among N racks, wherein the N racks are arranged in a positive direction according to the order of strip steel entering and exiting, the strip steel enters from the first rack, is rolled through the N racks in sequence, and exits from the Nth rack, wherein the N-1 racks among the N racks except the Nth rack are intermediate racks, wherein the intermediate thickness includes: an entrance thickness and an exit thickness;

[0007] S2, calculating the relative load coefficient between the intermediate frames in the intermediate frames according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power and maximum power of each intermediate frame in the intermediate frames;

[0008] S3, iteratively adjusting the outlet thickness of the intermediate rack according to the relative load coefficient between the intermediate racks, the predetermined maximum value of the relative load coefficient, the predetermined minimum value of the relative load coefficient, and the maximum outlet thickness and the minimum outlet thickness of each intermediate rack in the iteration process, wherein the initial value of the maximum outlet thickness of each intermediate rack is the outlet thickness of the previous rack located before the intermediate rack, and the initial value of the minimum outlet thickness of each intermediate rack is the outlet thickness of the next rack located after the intermediate rack;

[0009] Wherein, when the relative load factor is greater than the predetermined maximum value:

[0010] H i min =H i

[0011] H i =(H i +H i max ) / 2

[0012] H i min represents the minimum outlet thickness of the ith intermediate rack, H i max represents the maximum outlet thickness of the ith intermediate rack, H i represents the outlet thickness of the i-th intermediate rack, i∈[1,N-1];

[0013] And, when |H i -H i max |<H limit When H limit represents a predetermined threshold, the iteration ends and step S4 is executed; otherwise, the process returns to step S2;

[0014] When the relative load factor is less than the predetermined minimum value:

[0015] H i max =H i

[0016] H i =(H i +H i min ) / 2

[0017] And, when |Hi -H i min |<H limit When , the iteration ends and step S4 is executed; otherwise, return to step S2;

[0018] When the relative load factor satisfies the condition that it is greater than or equal to the predetermined minimum value and less than or equal to the predetermined maximum value, the iteration is terminated and step S4 is executed;

[0019] S4, converting the relative load factor into a unit distance relative to a predetermined ideal value, calculating the distance between the unit distance and the predetermined ideal value, and further calculating the root mean square of the distance; wherein:

[0020] c i =|b i -1|×1000

[0021]

[0022] c i represents the distance between the unit distance and the predetermined ideal value, b i represents the relative load factor, M represents the root mean square;

[0023] S5, when the root mean square is less than the predetermined value, the loop ends; otherwise, the maximum outlet thickness and the minimum outlet thickness of each intermediate rack are set as initial values, and the process goes to step S2.

[0024] Preferably, in the method for iteratively adjusting the cold rolling reduction distribution, step S2 further comprises:

[0025] The outlet speed of each intermediate rack of the intermediate rack is calculated according to the principle of equal second flow; wherein,

[0026] V i =V N ·H N / H i

[0027] V i represents the exit speed of the ith intermediate rack, V N Indicates the pre-obtained export speed of the Nth rack, H N Indicates the predetermined initial outlet thickness of the Nth rack.

[0028] Preferably, the method for iteratively adjusting the cold rolling reduction distribution comprises step S1:

[0029] The initial intermediate thickness of each of the N racks is calculated by the predetermined initial first inlet thickness of the first rack and the predetermined initial first outlet thickness of the last rack, where:

[0030] H i =H i-1 ·(H N / H0) 1 / N

[0031] or

[0032] H i =H i-1 -(H0-H N ) / N

[0033] H i-1 represents the outlet thickness of the rack before the i-th rack, that is, the inlet thickness of the i-th rack, H N represents the first outlet thickness, and H0 represents the first inlet thickness.

[0034] Preferably, in the method for iteratively adjusting the cold rolling reduction distribution, in step S2, the predetermined load balancing method includes: a method for achieving load balancing according to rolling force, power or power ratio.

[0035] Preferably, the method for iteratively adjusting the cold rolling reduction distribution, wherein step S2 comprises:

[0036] When the load balance is achieved using the rolling force:

[0037]

[0038] F i represents the rolling force of the ith stand, F i+1 represents the rolling force of the stand after the ith stand, a i represents the balance coefficient of the i-th rack, a i+1 represents the balance coefficient of the rack after the i-th rack;

[0039] When the power is used to achieve load balancing:

[0040]

[0041] P i represents the power of the i-th rack, P i+1 represents the power of the rack after the i-th rack;

[0042] When the power ratio is used to achieve load balancing:

[0043]

[0044] P i max represents the maximum power of the i-th rack, P i+1max Indicates the maximum power of the rack after the i-th rack.

[0045] Preferably, in the method for iteratively adjusting the cold rolling reduction distribution, the rolling force is obtained by a predetermined calculation model, wherein the calculation model is:

[0046]

[0047] h1=Δh+h2

[0048]

[0049] α3=1.08-1.02·ε

[0050]

[0051] αα7α1α3+α2

[0052]

[0053] R′=α9 2

[0054]

[0055] F represents the rolling force; h2, h1, C0 and α1-α9 are predetermined temporary variables; μ t ,v,E,v R and E R is a predetermined constant;

[0056] k fm represents the average deformation resistance calculated by the predetermined deformation resistance model, k h represents the deformation resistance at the rack outlet calculated by the deformation resistance model;

[0057] μ represents the friction coefficient calculated by a predetermined friction model;

[0058] H represents the inlet thickness of the current rack, which is equal to the outlet thickness H of the previous rack i-1 , h means H i , Δh represents the amount of reduction, ε represents the reduction rate;

[0059] t b Represents the rear unit tension, t f Indicates the front unit tension;

[0060] R0 represents the original working roll radius, and R′ represents the working roll radius after flattening.

[0061] Preferably, in the method for iteratively adjusting the cold rolling reduction distribution, the power is obtained by a predetermined power calculation model, wherein the power calculation model is:

[0062]

[0063] P represents power, B represents the width of the strip, T B Represents the post tension, T F Indicates the front tension, V r represents the roll speed, η1 represents the reduction ratio, η1 represents the efficiency coefficient, R0 represents the original working roll radius, R′ represents the working roll radius after flattening, F represents the rolling force, and Δh represents the reduction amount.

[0064] Preferably, in the method for iteratively adjusting the cold rolling reduction distribution, in step S3, the predetermined maximum value of the relative load factor and the predetermined minimum value of the relative load factor are determined by the following formula:

[0065] b i max =1+k1·k2 ite-1

[0066] b i min =1-k1·k2 ite-1

[0067] b i max represents the predetermined maximum value of the relative load factor, b i min represents the predetermined minimum value of the relative load factor, ite represents the number of iterations, and k1 and k2 represent predetermined constants.

[0068] On the other hand, an embodiment of the present invention provides a method for distributing pressure reduction of a single-stand reversible cold rolling mill, which includes:

[0069] S1, obtaining the initial intermediate thickness of N predetermined passes of the single stand, wherein the N predetermined passes are arranged in a positive direction according to the order of entry and exit of the strip steel, the strip steel enters from the first pass, enters and exits the rolling of the N passes in sequence, and exits from the Nth pass, and N-1 passes of the N predetermined passes except the Nth pass are intermediate passes, wherein the intermediate thickness includes: entrance thickness and exit thickness;

[0070] S2, calculating the relative load coefficient between the intermediate passes in the intermediate passes according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power and maximum power of each intermediate pass in the intermediate passes;

[0071] S3, iteratively adjusting the outlet thickness of the intermediate pass according to the relative load coefficient between the intermediate passes in the intermediate pass, the predetermined maximum value of the relative load coefficient, the predetermined minimum value of the relative load coefficient, the maximum outlet thickness and the minimum outlet thickness of each intermediate pass in the iteration process, wherein the initial value of the maximum outlet thickness of each intermediate pass is the outlet thickness of the previous pass before the intermediate pass, and the initial value of the minimum outlet thickness of each intermediate pass is the outlet thickness of the next rack after the intermediate pass;

[0072] Wherein, when the relative load factor is greater than the predetermined maximum value:

[0073] H i max =H i

[0074] H i =(H i +H i max ) / 2

[0075] H i min represents the minimum exit thickness of the ith intermediate pass, H i max represents the maximum exit thickness of the ith intermediate pass, H i represents the outlet thickness of the i-th intermediate pass, i∈[1, N-1];

[0076] And, when |H i -H i max |<H limit When H limit represents a predetermined threshold, the iteration ends and step S4 is executed; otherwise, the process returns to step S2;

[0077] When the relative load factor is less than the predetermined minimum value:

[0078] H i max =H i

[0079] H i =(H i +H i min ) / 2

[0080] And, when |H i -H i min |<H limit When , the iteration ends and step S4 is executed; otherwise, return to step S2;

[0081] When the relative load factor satisfies the condition that it is greater than or equal to the predetermined minimum value and less than or equal to the predetermined maximum value, the iteration is terminated and step S4 is executed;

[0082] S4, converting the relative load factor into a unit distance relative to a predetermined ideal value, calculating the distance between the unit distance and the predetermined ideal value, and further calculating the root mean square of the distance; wherein:

[0083] c i =|b i -1|×1000

[0084]

[0085] c i represents the distance between the unit distance and the predetermined ideal value, b i represents the relative load factor, M represents the root mean square;

[0086] S5, when the root mean square is less than the predetermined value, the loop ends; otherwise, the maximum outlet thickness and the minimum outlet thickness of each intermediate pass are set as initial values, and the process goes to step S2.

[0087] On the other hand, an embodiment of the present invention provides an electronic device, which includes a memory and a processor, wherein the memory stores at least one program, and the at least one program is executed by the processor to implement any method of iteratively adjusting the cold rolling reduction distribution as described above.

[0088] The above technical solution has the following technical effects:

[0089] The embodiment of the present invention obtains the initial intermediate thickness of N frames; calculates the relative load coefficient between each intermediate frame; dynamically adjusts the outlet thickness of each intermediate frame according to the relative load coefficient, the predetermined maximum value and the predetermined minimum value of the relative load coefficient, and the maximum outlet thickness and the minimum outlet thickness of each intermediate frame, and after each adjustment, checks whether the predetermined threshold is met, and if so, proceeds to the next step, otherwise returns to the step of calculating the relative load coefficient to continue iteration; converts the relative load coefficient into a unit distance relative to a predetermined ideal value, calculates the distance between these unit distances and the predetermined ideal value, and then calculates the root mean square of these distances; when the root mean square is less than the predetermined value, ends the loop; otherwise, sets the maximum outlet thickness and the minimum outlet thickness of each intermediate frame to the initial value, and returns to the step of calculating the relative load coefficient to continue the loop; therefore, through the cyclic iterative adjustment method of the embodiment of the present invention, the calculation process of the cold rolling reduction distribution is significantly simplified, the complex Jacobi matrix calculation and inversion operation are avoided, the calculation speed and convergence are improved, and the quality of the cold-rolled products is finally improved.

[0090] In a further embodiment, by calculating the outlet speed of the intermediate rack, the second flow rate of each rack is ensured to be equal, thereby ensuring the continuous flow of the strip between the racks, avoiding breakage or accumulation, and improving the stability and continuity of the rolling process; further optimizing the pressure distribution to ensure the load balance of each rack, and the principle of equal second flow rate ensures the uniform deformation of the strip between the racks, improves the thickness uniformity and surface quality of the strip, and thus improves the overall quality of the product;

[0091] In a further embodiment, the embodiment of the present invention does not have high requirements on the initial value of the pressure distribution, that is, it can quickly and accurately determine the initial thickness of each frame. Even if there is a certain error in the initial value, this embodiment can gradually correct it through subsequent iterative optimization to ensure that the final pressure distribution reaches the optimal state. BRIEF DESCRIPTION OF THE DRAWINGS

[0092] Figure 1 It is a flow chart of a method for iteratively adjusting the cold rolling reduction distribution according to an embodiment of the present invention;

[0093] Figure 2 In a method for iteratively adjusting the cold rolling reduction distribution according to an embodiment of the present invention, an iterative adjustment curve diagram of the initial intermediate thickness is obtained by using a reduction distribution strategy of equal reduction;

[0094] Figure 3 In a method for iteratively adjusting the reduction distribution of cold rolling according to an embodiment of the present invention, an iterative adjustment curve diagram of the initial intermediate thickness is obtained by using a reduction distribution strategy with a constant reduction rate;

[0095] Figure 4 In a method for iteratively adjusting the cold rolling reduction distribution in one embodiment of the present invention, an iterative adjustment curve diagram of the initial intermediate thickness is obtained by using a reduction distribution strategy close to the finished product;

[0096] Figure 5 In a method for iteratively adjusting the cold rolling reduction distribution according to an embodiment of the present invention, an iterative adjustment curve diagram of the initial intermediate thickness is obtained by using a reduction distribution strategy close to the raw material;

[0097] Figure 6 It is a schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0098] To further illustrate the various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, a person of ordinary skill in the art should be able to understand other possible implementations and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0099] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0100] Embodiment 1:

[0101] In order to simplify the calculation process of cold rolling reduction distribution, achieve the effects of strong feasibility, good convergence, and fast calculation speed, and be able to produce according to the calculation results, further improve the quality of cold-rolled products, reduce strip breaks and shutdowns in production, and reduce equipment losses, an embodiment of the present invention provides a method for iteratively adjusting cold rolling reduction distribution, and the iteration of this embodiment is a cyclic iteration. Figure 1 Flow chart of a method for iteratively adjusting the cold rolling reduction distribution according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0102] S1, obtaining the initial intermediate thickness of each rack among N racks, wherein the N racks are arranged in a positive direction according to the order of strip steel entering and exiting, the strip steel enters from the first rack, is rolled through N racks in sequence, and exits from the Nth rack, and the N-1 racks among the N racks except the Nth rack are intermediate racks, wherein the intermediate thickness includes: entrance thickness and exit thickness;

[0103] S2, calculating the relative load coefficient between the intermediate frames in the intermediate frames according to the predetermined load balancing method and the predetermined balance coefficient, rolling force, power and maximum power of the intermediate frames in the intermediate frames;

[0104] S3, iteratively adjusting the outlet thickness of the intermediate racks according to the relative load coefficient between the intermediate racks, the predetermined maximum value of the relative load coefficient, the predetermined minimum value of the relative load coefficient, and the maximum outlet thickness and the minimum outlet thickness of each intermediate rack in the iteration process, wherein the initial value of the maximum outlet thickness of each intermediate rack is the outlet thickness of the previous rack located before the intermediate rack, and the initial value of the minimum outlet thickness of each intermediate rack is the outlet thickness of the next rack located after the intermediate rack;

[0105] Among them, when the relative load factor is greater than the predetermined maximum value:

[0106] H i min =H i

[0107] H i =(H i +H i max ) / 2

[0108] H i min represents the minimum outlet thickness of the ith intermediate rack, H i maxrepresents the maximum outlet thickness of the ith intermediate rack, H i represents the outlet thickness of the i-th intermediate rack, i∈[1,N-1];

[0109] And, when |H i -H i max |<H limit When , the iteration ends and step S4 is executed; otherwise, return to step S2;

[0110] When the relative load factor is less than the predetermined minimum value:

[0111] H i max =H i

[0112] H i =(H i +H i min ) / 2

[0113] And, when |H i -H i min |<H limit When H limit represents a predetermined threshold, the iteration ends and step S4 is executed; otherwise, the process returns to step S2;

[0114] When the relative load factor satisfies the condition that it is greater than or equal to the predetermined minimum value and less than or equal to the predetermined maximum value, the iteration is terminated and step S4 is executed;

[0115] S4, converting the relative load factor into a unit distance relative to a predetermined ideal value, calculating the distance between the unit distance and the predetermined ideal value, and further calculating the root mean square of the distance; wherein:

[0116] c i =}b i -1|×1000

[0117]

[0118] c i Indicates the distance between the unit distance and the predetermined ideal value, b i represents the relative load factor, M represents the root mean square;

[0119] S5, when the RMS value is less than the predetermined value, the loop ends; otherwise, the maximum outlet thickness and the minimum outlet thickness of each intermediate rack are set to the initial value, and the process goes to step S2.

[0120] Embodiment 2:

[0121] In order to improve the product quality of the cold rolling mill, overcome the complicated Jacobi matrix calculation and inverse operation in the cold rolling reduction distribution calculation process, and prevent the calculation divergence from failing to obtain effective results, an embodiment of the present invention provides a method for iteratively adjusting the cold rolling reduction distribution, which iteratively calculates the outlet thickness of each intermediate frame and cyclically determines whether the calculation accuracy requirement is met. Preferably, the cold rolling mill is a five-frame cold rolling mill; specifically, the method comprises:

[0122] S101, obtaining a load balancing method and a balancing coefficient of cold rolling;

[0123] Preferably, the load balancing method includes: a method of achieving load balancing according to rolling force, power or power ratio;

[0124] Preferably, the balance coefficient includes: proportional balance or custom balance;

[0125] Preferably, the load balancing method and balancing coefficient are preset manually through process experience;

[0126] In a specific embodiment, taking into account good plate shape and stable production, the load balancing method selects rolling force balance, and the balance coefficient of the five-stand continuous rolling is [1.2, 1.1, 1, 1, 0.9].

[0127] S201, obtaining production data of the strip steel;

[0128] Preferably, the production data includes: basic master data of the strip, parameters of the usage model, roll information and process requirements, specifically, at least including: raw material thickness, finished product thickness, width, deformation resistance model coefficient, friction model coefficient, roll diameter of each stand roll, unit exit speed, unit unit tension system, etc.

[0129] In a specific embodiment, the production data of the strip steel is obtained as shown in Table 1 below:

[0130] Production data items value Raw material thickness 2.5mm Finished product thickness 0.5mm width 1.2m Roller diameter of each stand 390mm,390mm,390mm,390mm,400mm Unit outlet speed 1000m / min Unit tension system 70MPa,140MPa,145MPa,150MPa,150MPa,50MPa

[0131] Table 1

[0132] S301, determining an initial pressing distribution system, that is, determining an initial middle thickness of each rack among N racks;

[0133] Preferably, the intermediate thickness includes: an inlet thickness and an outlet thickness;

[0134] N racks are arranged in a positive direction according to the order of strip steel entering and exiting. The strip steel enters from the first rack, is rolled through N racks in sequence, and exits from the Nth rack. That is, the exit thickness of the previous rack is the entrance thickness of the next rack. Among the N racks, the N-1 racks except the Nth rack are intermediate racks.

[0135] For N-stand continuous rolling, since the inlet thickness of the first stand and the outlet thickness of the last stand are the raw material thickness and the target finished product thickness respectively, their values ​​are known;

[0136] In a specific embodiment, the initial intermediate thickness of each rack in the N racks is calculated by the initial first inlet thickness predetermined for the first rack and the initial first outlet thickness predetermined for the last rack, wherein:

[0137] H i =H i-1 ·(H N -H0) 1 / N

[0138] or

[0139] H i =H i-1 -(H0-H N ) / N

[0140] H i-1 represents the outlet thickness of the previous rack of the i-th rack, which is equal to the inlet thickness of the i-th rack, H N represents the initial first outlet thickness, and H0 represents the initial first inlet thickness.

[0141] In a specific embodiment, the initial thickness of the five-stand cold rolling mill as shown in Table 1 is [2.500, 1.812, 1.313, 0.952, 0.690, 0.500], wherein the initial first entrance thickness is 2.500, the initial first exit thickness is 0.500, and the initial intermediate thicknesses are 1.812, 1.313, 0.952 and 0.690.

[0142] S401, according to the relative load factor between the intermediate racks, the predetermined maximum value of the relative load factor, the predetermined minimum value of the relative load factor, the maximum outlet thickness H of each intermediate rack in the iteration process, i max and minimum outlet thickness H i min To iteratively adjust the outlet thickness of the middle rack, including:

[0143] Preferably, the initial value of the maximum outlet thickness of each intermediate rack is the outlet thickness of the previous rack located before itself, and the initial value of the minimum outlet thickness of each intermediate rack is the outlet thickness of the next rack located after itself, that is, H i max =H i-1 , H i min =H i+1 ;

[0144] S402, calculating the outlet speed of each intermediate rack according to the principle of equal flow rate per second, which directly affects the friction coefficient, wherein,

[0145] V i =V N ·H N / H i

[0146] V i represents the exit speed of the ith intermediate rack, V N Indicates the pre-obtained export speed of the Nth rack, H N It represents the initial outlet thickness of the Nth rack, H i represents the outlet thickness of the ith intermediate rack.

[0147] S403, calculating the relative load factor between the intermediate racks, where:

[0148] When the rolling force is used to achieve load balance:

[0149]

[0150] F i represents the rolling force of the ith stand, F i+1 represents the rolling force of the stand after the ith stand, a i represents the balance coefficient of the i-th rack, a i+1 represents the balance coefficient of the rack after the i-th rack;

[0151] When using power to achieve load balancing:

[0152]

[0153] P i represents the power of the i-th rack, P i+1 represents the power of the rack after the i-th rack;

[0154] When using power ratio to achieve load balancing:

[0155]

[0156] P i max represents the maximum power of the i-th rack, P i+1 max represents the maximum power of the rack after the i-th rack;

[0157] Among them, the rolling force is obtained through a predetermined calculation model, and the calculation model is:

[0158]

[0159] h1=Δh+h2

[0160]

[0161]

[0162] α3=1.08-1.02·ε

[0163]

[0164] α7=α1·α3+α2

[0165]

[0166] R′=α9 2

[0167]

[0168] F represents rolling force; h2, h1, C0 and α1~α9 are predetermined temporary variables; μ t ,v,E,v R and E R is a predetermined constant. In a specific implementation, the value is: t =0.7, v=0.3, E=210000, v R =0.3, E R =210000;

[0169] k fm represents the average deformation resistance calculated by the predetermined deformation resistance model, k h It represents the deformation resistance at the rack outlet calculated by the deformation resistance model;

[0170] μ represents the friction coefficient calculated by a predetermined friction model;

[0171] H represents the inlet thickness of the current rack, which is equal to the outlet thickness H of the previous rack i-1 , h means H i , Δh represents the amount of reduction, ε represents the reduction rate;

[0172] t b Represents the rear unit tension, t f Indicates the front unit tension;

[0173] R0 represents the original working roll radius, and R′ represents the working roll radius after flattening.

[0174] The power is obtained through a predetermined power calculation model, wherein the power calculation model is:

[0175]

[0176] P represents power, B represents the width of the strip, T B Represents the post tension, T F Indicates the front tension, V r represents the roller speed, η1 represents the reduction ratio, and η2 represents the efficiency coefficient.

[0177] S404, adjusting the corresponding outlet thickness according to the relative load factor of each intermediate frame;

[0178] a. When the relative load factor is greater than the predetermined maximum value, the minimum outlet thickness of the intermediate frame is adjusted to the current outlet thickness, and then the current outlet thickness is increased according to a predetermined ratio, wherein:

[0179] H i max =H i

[0180] H i =(H i +H i max ) / 2

[0181] H i max represents the minimum outlet thickness of the ith intermediate rack, H i max represents the maximum outlet thickness of the ith intermediate rack, H i represents the outlet thickness of the i-th intermediate rack, i∈[1,N-1];

[0182] And, when |H i +H i max |<H limit When H limit indicates a predetermined threshold, the iteration ends and step S501 is executed; otherwise, the process returns to step S401;

[0183] Preferably, H limit The value of is 0.01;

[0184] In a specific embodiment, for research and analysis, H limit The precision value needs to be high enough, so H limit The value of is 0.001;

[0185] b. When the relative load factor is less than the predetermined minimum value, the maximum outlet thickness of the intermediate frame is adjusted to the current outlet thickness, and then the current outlet thickness is reduced according to a predetermined ratio, wherein:

[0186] H imax =H i

[0187] H i =(H i +H i min ) / 2

[0188] And, when |H i +H i min |<H limit When , the iteration ends and step S501 is executed; otherwise, the process returns to step S401;

[0189] c. When the relative load factor satisfies a value greater than or equal to a predetermined minimum value and less than or equal to a predetermined maximum value, the iteration ends and step S501 is executed;

[0190] Preferably, the predetermined minimum value and the predetermined maximum value of the relative load factor are obtained by the following formula:

[0191] b i max =1+k1·k2 ite-1

[0192] b i min =1-k1·k2 ite-1

[0193] b i max represents the predetermined maximum value of the relative load factor, b i min represents the predetermined minimum value of the relative load factor, ite represents the number of iterations, k1 and k2 represent predetermined constants; in a specific embodiment, k1 takes a value of 0.5, and k2 takes a value of 0.5.

[0194] S501, converting the relative load factor into a unit distance relative to a predetermined ideal value, calculating the distance between the unit distance and the predetermined ideal value, and further calculating the root mean square of the distance; wherein:

[0195] c i =|b i -1|×100

[0196] c i Indicates the distance between the unit distance and the predetermined ideal value, b i represents relative load factor and M represents root mean square.

[0197] S601, when the RMS is less than the predetermined value M minWhen the maximum outlet thickness and the minimum outlet thickness of each intermediate rack are set to the initial value, the cycle ends; otherwise, the maximum outlet thickness and the minimum outlet thickness of each intermediate rack are set to the initial value, and the process goes to step S401;

[0198] Preferably, the predetermined value M min The value of is 0.1.

[0199] In a specific embodiment, the cyclic iterative calculation results of the five-stand cold rolling mill using the above method are shown in Table 2 below:

[0200]

[0201] Table 2

[0202] In each cycle of calculating the RMS, the outlet thickness of each intermediate rack is iteratively calculated. The initial iteration of the outlet thickness of each intermediate rack is fast, and then it is fine-tuned according to the RMS calculation to deeply explore the outlet thickness value. Specifically, taking the 15th cycle as an example, the current outlet thickness is calculated by the outlet thickness of the previous cycle iteration, that is, the result of iteratively calculating the outlet thickness of the four intermediate racks of the five-stand cold rolling mill in step S401 is:

[0203] For the first intermediate rack, the iteratively calculated outlet thickness is:

[0204] 1.36208147139313,1.48616433106683,1.54820576090368,1.5792264758221,1.59473683328132,1.60249201201092,1.60636960137573,1.60830839605813,1.60927779339933,1.60976249206993,1.61000484140523,1.60988366673758,1.6099442540714,1.60997454773832;

[0205] For the second intermediate rack, the iteratively calculated outlet thickness is:

[0206] 0.971467651136142,1.04269170159093,1.07830372681833,1.09610973943203,1.10501274573887,1.1094642488923,1.11169000046901,1.11280287625737,1.11335931415155,1.11363753309863,1.11377664257218,1.11370708783541;

[0207] For the third intermediate rack, the iteratively calculated outlet thickness is:

[0208] 0.719082039723028,0.774050794974794,0.801535172600677,0.815277361413619,0.822148455820089,0.825584003023325,0.827301776624942, 0.828160663425751,0.828590106826156,0.828804828526358,0.828912189376459,0.828858508951408,0.828885349163934,0.828898769270196;

[0209] For the 4th intermediate rack, the iteratively calculated outlet thickness is:

[0210] 0.554572264609748,0.581858396914622,0.595501463067059,0.602322996143277,0.605733762681386,0.607439145950441,0.608291837584968,0.608718183402232,0.608931356310864,0.60903794276518,0.609091235992338,0.609117882605917,0.609104559299127;

[0211] As shown in the above data results, the calculation accuracy is already very high at this time, and the optimal middle thickness of each rack can be quickly found.

[0212] Figure 2 In a method for iteratively adjusting the cold rolling reduction distribution according to an embodiment of the present invention, an iterative adjustment curve diagram of the initial intermediate thickness is obtained by using a reduction distribution strategy of equal reduction; Figure 3 In a method for iteratively adjusting the reduction distribution of cold rolling according to an embodiment of the present invention, an iterative adjustment curve diagram of the initial intermediate thickness is obtained by using a reduction distribution strategy with a constant reduction rate; Figure 4 In a method for iteratively adjusting the cold rolling reduction distribution in one embodiment of the present invention, an iterative adjustment curve diagram of the initial intermediate thickness is obtained by using a reduction distribution strategy close to the finished product; Figure 5In a method for iteratively adjusting the cold rolling reduction distribution in one embodiment of the present invention, an iterative adjustment curve diagram of the initial intermediate thickness is obtained using a reduction distribution strategy close to the raw material; this embodiment includes a five-stand cold rolling mill, four of which are intermediate stands.

[0213] like Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, the abscissa represents the number of cycles obtained according to the root mean square calculation result, the ordinate represents the outlet thickness, and the four curves correspond to the adjustment curves of the four intermediate frames of the five-stand cold rolling mill respectively; after adjustment by the method of the embodiment of the present invention, the outlet thickness of each intermediate frame of the five-stand cold rolling mill under different pressure distribution strategies are 1.610, 1.113, 0.829, 0.609 respectively, and the number of cycles is shown in Table 3 below; that is, the method of the embodiment of the present invention does not have high requirements on the initial intermediate thickness of each intermediate frame, and different initial intermediate thicknesses do not affect the final result, but the closer the initial intermediate thickness is to the final result, the fewer the number of cycles.

[0214] Push-down allocation strategy Initial thickness Cycle times 1 Isobaric reduction 2.100,1.700,1.300,0.900 17 2 Isobaric reduction rate 1.812,1.313,0.952,0.690 15 3 Close to the finished product 0.700,0.660,0.620,0.580 14 4 Close to raw materials 2.400,2.300,2.200,2.100 19

[0215] Table 3

[0216] Embodiment three:

[0217] The above-mentioned method for a multi-frame main body of the embodiment of the present invention can be easily converted to a single-frame reversible cold rolling mill for use. Therefore, this embodiment of the present invention provides a method for pressure distribution of a single-frame reversible cold rolling mill, by converting multiple frames into multiple passes of a single frame, and converting the intermediate frames into the intermediate passes of the single-frame multiple passes, and the remaining calculation processes can be applied based on the above-mentioned conversion, that is, the method for pressure distribution of a single-frame reversible cold rolling mill of this embodiment has the same inventive concept as the method for pressure distribution of a multi-frame reversible cold rolling mill described above. Specifically, the method for pressure distribution of a single-frame reversible cold rolling mill of this embodiment includes:

[0218] S1, obtaining the initial intermediate thickness of N predetermined passes of the single stand, wherein the N predetermined passes are arranged in a positive direction according to the order of entry and exit of the strip steel, the strip steel enters from the first pass, enters and exits the rolling of the N passes in sequence, and exits from the Nth pass, and N-1 passes of the N predetermined passes except the Nth pass are intermediate passes, wherein the intermediate thickness includes: entrance thickness and exit thickness;

[0219] S2, calculating the relative load coefficient between the intermediate passes in the intermediate passes according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power and maximum power of each intermediate pass in the intermediate passes;

[0220] S3, iteratively adjusting the outlet thickness of the intermediate pass according to the relative load coefficient between the intermediate passes in the intermediate pass, the predetermined maximum value of the relative load coefficient, the predetermined minimum value of the relative load coefficient, the maximum outlet thickness and the minimum outlet thickness of each intermediate pass in the iteration process, wherein the initial value of the maximum outlet thickness of each intermediate pass is the outlet thickness of the previous pass before the intermediate pass, and the initial value of the minimum outlet thickness of each intermediate pass is the outlet thickness of the next rack after the intermediate pass;

[0221] Wherein, when the relative load factor is greater than the predetermined maximum value:

[0222] h i min =H i

[0223] H i =(H i +H i max ) / 2

[0224] H i min represents the minimum exit thickness of the ith intermediate pass, H i max represents the maximum exit thickness of the ith intermediate pass, H i represents the outlet thickness of the i-th intermediate pass, i∈[1, N-1];

[0225] And, when |H i -H i max |<H limit When H limit represents a predetermined threshold, the iteration ends and step S4 is executed; otherwise, the process returns to step S2;

[0226] When the relative load factor is less than the predetermined minimum value:

[0227] H i max =H i

[0228] H i =(H i +H i min ) / 2

[0229] And, when |H i -H i min |<H limit When , the iteration ends and step S4 is executed; otherwise, return to step S2;

[0230] When the relative load factor satisfies the condition that it is greater than or equal to the predetermined minimum value and less than or equal to the predetermined maximum value, the iteration is terminated and step S4 is executed;

[0231] S4, converting the relative load factor into a unit distance relative to a predetermined ideal value, calculating the distance between the unit distance and the predetermined ideal value, and further calculating the root mean square of the distance; wherein:

[0232] c i =|b i -1|×100

[0233] c i represents the distance between the unit distance and the predetermined ideal value, b i represents the relative load factor, M represents the root mean square;

[0234] S5, when the root mean square is less than the predetermined value, the loop ends; otherwise, the maximum outlet thickness and the minimum outlet thickness of each intermediate pass are set as initial values, and the process goes to step S2.

[0235] Embodiment 4:

[0236] The present invention also provides an electronic device, such as Figure 6 As shown, the electronic device includes a processor 601, a memory 602, a bus 603, and a computer program stored in the memory 602 and executable on the processor 601. The processor 601 includes one or more processing cores. The memory 602 is connected to the processor 601 via the bus 603. The memory 602 is used to store program instructions. When the processor executes the computer program, the steps in the above-mentioned method embodiment of the present invention are implemented.

[0237] Further, as an executable solution, the electronic device may be a computer unit, and the computer unit may be a computing device such as a desktop computer, a notebook, a PDA, and a cloud server. The computer unit may include, but is not limited to, a processor and a memory. Those skilled in the art may understand that the composition structure of the above-mentioned computer unit is only an example of a computer unit and does not constitute a limitation on the computer unit, and may include more or less components than the above-mentioned, or a combination of certain components, or different components. For example, the computer unit may also include input and output devices, network access devices, buses, etc., which are not limited in the embodiments of the present invention.

[0238] Further, as an executable solution, the processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the computer unit, and various interfaces and lines are used to connect the various parts of the entire computer unit.

[0239] The memory can be used to store the computer program and / or module, and the processor realizes various functions of the computer unit by running or executing the computer program and / or module stored in the memory, and calling the data stored in the memory. The memory can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and at least one application required for a function; the data storage area can store data created according to the use of the mobile phone, etc. In addition, the memory can include a high-speed random access memory, and can also include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (SecureDigital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage devices.

[0240] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A method for iteratively adjusting the cold rolling reduction distribution, characterized in that: include: S1, obtaining the initial intermediate thickness of each rack among N racks, wherein the N racks are arranged in a positive direction according to the order of strip steel entering and exiting, the strip steel enters from the first rack, is rolled through the N racks in sequence, and exits from the Nth rack, wherein the N-1 racks among the N racks except the Nth rack are intermediate racks, wherein the intermediate thickness includes: an entrance thickness and an exit thickness; S2, calculating the relative load coefficient between the intermediate frames in the intermediate frames according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power and maximum power of each intermediate frame in the intermediate frames; S3, iteratively adjusting the outlet thickness of the intermediate rack according to the relative load coefficient between the intermediate racks, the predetermined maximum value of the relative load coefficient, the predetermined minimum value of the relative load coefficient, and the maximum outlet thickness and the minimum outlet thickness of each intermediate rack in the iteration process, wherein the initial value of the maximum outlet thickness of each intermediate rack is the outlet thickness of the previous rack located before the intermediate rack, and the initial value of the minimum outlet thickness of each intermediate rack is the outlet thickness of the next rack located after the intermediate rack; Wherein, when the relative load factor is greater than the predetermined maximum value: H i min =H i H i =(H i +H i max ) / 2 H i min represents the minimum outlet thickness of the ith intermediate rack, H i max represents the maximum outlet thickness of the ith intermediate rack, H i represents the outlet thickness of the i-th intermediate rack, i∈[1,N-1]; And, when |H i -H i max |<H limit When H limit represents a predetermined threshold, the iteration ends and step S4 is executed; otherwise, the process returns to step S2; When the relative load factor is less than the predetermined minimum value: H i max =H i H i =(H i +H i min ) / 2 And, when |H i -H i min |<H limit When , the iteration ends and step S4 is executed; otherwise, return to step S2; When the relative load factor satisfies the condition that it is greater than or equal to the predetermined minimum value and less than or equal to the predetermined maximum value, the iteration is terminated and step S4 is executed; S4, converting the relative load factor into a unit distance relative to a predetermined ideal value, calculating the distance between the unit distance and the predetermined ideal value, and further calculating the root mean square of the distance; wherein: c i =|b i -1|×1000 c i represents the distance between the unit distance and the predetermined ideal value, b i represents the relative load factor, M represents the root mean square; S5, when the root mean square is less than the predetermined value, the loop ends; otherwise, the maximum outlet thickness and the minimum outlet thickness of each intermediate rack are set to the initial value, and the process goes to step S2.

2. The method for iteratively adjusting the cold rolling reduction distribution according to claim 1, characterized in that: The step S2 further comprises: The outlet speed of each intermediate rack of the intermediate rack is calculated according to the principle of equal second flow; wherein, V i =V N ·H N / H i V i represents the exit speed of the ith intermediate rack, V N Indicates the pre-obtained export speed of the Nth rack, H N Indicates the predetermined initial outlet thickness of the Nth rack.

3. The method for iteratively adjusting the cold rolling reduction distribution according to claim 1, characterized in that: Step S1 is: The initial intermediate thickness of each of the N racks is calculated by the predetermined initial first inlet thickness of the first rack and the predetermined initial first outlet thickness of the last rack, where: H i =H i-1 ·(H N / H0) 1 / N or H i =H i-1 -(H0-H N ) / N H i-1 represents the outlet thickness of the rack before the i-th rack, that is, the inlet thickness of the i-th rack, H N represents the first outlet thickness, H 0 represents the first inlet thickness.

4. The method for iteratively adjusting the cold rolling reduction distribution according to claim 1, characterized in that: In step S2, the predetermined load balancing method includes: a method of achieving load balancing according to rolling force, power or power ratio.

5. The method for iteratively adjusting the cold rolling reduction distribution according to claim 4, characterized in that: Step S2 includes: When the load balance is achieved using the rolling force: F i represents the rolling force of the ith stand, F i+1 represents the rolling force of the stand after the ith stand, a i represents the balance coefficient of the i-th rack, a i+1 represents the balance coefficient of the rack after the i-th rack; When the power is used to achieve load balancing: P i represents the power of the i-th rack, P i+1 represents the power of the rack after the i-th rack; When the power ratio is used to achieve load balancing: P i max represents the maximum power of the i-th rack, P i+1 max Indicates the maximum power of the rack after the i-th rack.

6. The method for iteratively adjusting the cold rolling reduction distribution according to claim 5, characterized in that: The rolling force is obtained by a predetermined calculation model, wherein the calculation model is: h1=Δh+h2 α3=1.08-1.02·ε α7＝α1·α3+α2 R′＝α9 2 F represents the rolling force; h2, h1, C0 and α1-α9 are predetermined temporary variables; μ t ,v,E,v R and E R is a predetermined constant; k fm represents the average deformation resistance calculated by the predetermined deformation resistance model, k h represents the deformation resistance at the rack outlet calculated by the deformation resistance model; μ represents the friction coefficient calculated by a predetermined friction model; H represents the inlet thickness of the current rack, which is equal to the outlet thickness H of the previous rack i-1 , h means H i , Δh represents the amount of reduction, ε represents the reduction rate; t b Represents the rear unit tension, t f Indicates the front unit tension; R0 represents the original working roll radius, and R′ represents the working roll radius after flattening.

7. The method for iteratively adjusting the cold rolling reduction distribution according to claim 5, characterized in that: The power is obtained through a predetermined power calculation model, wherein the power calculation model is: P represents power, B represents the width of the strip, T B Represents the post tension, T F Indicates the front tension, V r represents the roll speed, η1 represents the reduction ratio, η1 represents the efficiency coefficient, R0 represents the original working roll radius, R′ represents the working roll radius after flattening, F represents the rolling force, and Δh represents the reduction amount.

8. The method for iteratively adjusting the cold rolling reduction distribution according to claim 1, characterized in that: In step S3, the predetermined maximum value of the relative load factor and the predetermined minimum value of the relative load factor are determined by the following formula: b i max =1+k1·k2 ite-1 b i min =1-k1·k2 ite-1 b i max represents the predetermined maximum value of the relative load factor, b i min represents the predetermined minimum value of the relative load factor, ite represents the number of iterations, and k1 and k2 represent predetermined constants.

9. A method for distributing pressure reduction in a single-stand reversible cold rolling mill, characterized in that: include: S1, obtaining the initial intermediate thickness of N predetermined passes of the single stand, wherein the N predetermined passes are arranged in a positive direction according to the order of entry and exit of the strip steel, the strip steel enters from the first pass, enters and exits the rolling of the N passes in sequence, and exits from the Nth pass, and N-1 passes of the N predetermined passes except the Nth pass are intermediate passes, wherein the intermediate thickness includes: entrance thickness and exit thickness; S2, calculating the relative load coefficient between the intermediate passes in the intermediate passes according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power and maximum power of each intermediate pass in the intermediate passes; S3, iteratively adjusting the outlet thickness of the intermediate pass according to the relative load coefficient between the intermediate passes in the intermediate pass, the predetermined maximum value of the relative load coefficient, the predetermined minimum value of the relative load coefficient, the maximum outlet thickness and the minimum outlet thickness of each intermediate pass in the iteration process, wherein the initial value of the maximum outlet thickness of each intermediate pass is the outlet thickness of the previous pass before the intermediate pass, and the initial value of the minimum outlet thickness of each intermediate pass is the outlet thickness of the next rack after the intermediate pass; Wherein, when the relative load factor is greater than the predetermined maximum value: H i min =H i H i =(H i +H i max ) / 2 H i min represents the minimum exit thickness of the ith intermediate pass, H i max represents the maximum exit thickness of the ith intermediate pass, H i represents the outlet thickness of the i-th intermediate pass, i∈[1, N-1]; And, when |H i -H i max |<H limit When H limit represents a predetermined threshold, the iteration ends and step S4 is executed; otherwise, the process returns to step S2; When the relative load factor is less than the predetermined minimum value: H i max =H i H i =(H i +H i min ) / 2 And, when |H i -H i min |<H limit When , the iteration ends and step S4 is executed; otherwise, return to step S2; When the relative load factor satisfies the condition that it is greater than or equal to the predetermined minimum value and less than or equal to the predetermined maximum value, the iteration is terminated and step S4 is executed; S4, converting the relative load factor into a unit distance relative to a predetermined ideal value, calculating the distance between the unit distance and the predetermined ideal value, and further calculating the root mean square of the distance; wherein: c i =|b i -1|×1000 C i represents the distance between the unit distance and the predetermined ideal value, b i represents the relative load factor, M represents the root mean square; S5, when the root mean square is less than the predetermined value, the loop ends; otherwise, the maximum outlet thickness and the minimum outlet thickness of each intermediate pass are set as initial values, and the process goes to step S2.

10. An electronic device, characterized in that: The method comprises a memory and a processor, wherein the memory stores at least one program, and the at least one program is executed by the processor to implement the method for iteratively adjusting the cold rolling reduction distribution as claimed in any one of claims 1 to 9.

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