A method and electronic device for iteratively adjusting the reduction distribution of cold rolling

Abstract

The present invention provides a method and electronic device for iteratively adjusting the reduction distribution of a cold rolling mill. The method comprises: S1 obtaining the initial intermediate thickness of a stand, where the stands other than the last stand are intermediate stands; S2 calculating the equivalent load coefficient; S3 determining the intermediate stand corresponding to the extreme value of the equivalent load coefficient; if the intermediate stand corresponding to the maximum value is the same as the intermediate stand corresponding to the previous maximum value, and if the intermediate stand corresponding to the minimum value is the same as the intermediate stand corresponding to the previous minimum value, proportionally reducing the basic adjustment thickness; otherwise, using a predetermined basic adjustment thickness; S4 terminating the iteration when the basic adjustment thickness is less than a predetermined value; S5 using the equivalent load coefficient to calculate the inlet load efficiency and outlet load efficiency, determining the outlet thickness adjustment amount for the predetermined stand, performing an adjustment, obtaining the adjusted outlet thickness, and returning to step S2. The above technical solution can improve the quality and production efficiency of cold-rolled products.

Description

Technical Field

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

[0002] In the field of tandem cold rolling, there are multiple reduction distribution schemes for rolling strip from a specified raw material thickness to a target finished product thickness. Traditional reduction distribution methods, such as empirical methods, are simple and easy to implement, but they are highly dependent on operator experience and difficult to achieve the optimal reduction distribution result. Currently, iterative methods, such as the Newton-Raphson method, are widely used. They repeatedly calculate the intermediate thickness, but this method is computationally complex and has extremely stringent requirements on the initial value of the intermediate thickness. If the initial value is not chosen properly, the calculation process is prone to divergence, and a reasonable solution cannot be obtained.

[0003] In addition to the Newton-Raphson method, there are other directional iterative methods, such as those that combine initial pressure reduction distribution with dynamic pressure reduction adjustment. These methods gradually optimize the pressure reduction distribution by initially allocating pressure reduction and gradually adjusting the pressure reduction of each rack. However, these methods also have the problem of high requirements for initial pressure reduction distribution and are prone to jitter during the adjustment process, resulting in slow calculation speed. Although these methods improve computational efficiency to a certain extent, they still cannot completely overcome the problems of initial value sensitivity and slow adjustment speed. Summary of the Invention

[0004] The embodiments of the present invention provide a method and electronic device for iteratively adjusting the reduction distribution of cold rolling, so as to achieve the effects of simple calculation process, good convergence and fast calculation speed, and improve the quality and production efficiency of cold-rolled products.

[0005] To achieve the above objectives, a method for iteratively adjusting the reduction distribution of tandem cold rolling is provided, the method comprising:

[0006] S1, obtaining an initial intermediate thickness of each of N racks, wherein the N racks are arranged in a forward direction according to the order of strip entry and exit, the strip entering from the first rack, sequentially passing through the N racks for rolling, and exiting from the Nth rack, wherein N-1 racks of the N racks excluding the Nth rack are intermediate racks, wherein the intermediate thickness includes an entry thickness and an exit thickness;

[0007] S2, calculating an equivalent load factor of each intermediate rack in the intermediate rack according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power, and maximum power of each intermediate rack in the intermediate rack;

[0008] S3: Determine, based on the equivalent load coefficients of the intermediate racks, a first intermediate rack and a second intermediate rack corresponding to extreme values ​​of the equivalent load coefficients, where the extreme values ​​include a maximum value and a minimum value; wherein the first intermediate rack is arranged before the second intermediate rack;

[0009] If the intermediate rack corresponding to the maximum value is the same rack as the intermediate rack corresponding to the maximum equivalent load coefficient in the previous iteration stored in advance, and the intermediate rack corresponding to the minimum value is the same rack as the intermediate rack corresponding to the minimum equivalent load coefficient in the previous iteration stored in advance, then reducing the predetermined basic adjustment thickness according to a preset ratio; otherwise, using the predetermined basic adjustment thickness;

[0010] S4, when the basic adjustment thickness is less than a predetermined value, ending the iteration;

[0011] S5, using the equivalent load coefficient to calculate the inlet load efficiency and outlet load efficiency of each intermediate rack, and according to the calculated corresponding inlet load efficiency and outlet load efficiency and the corresponding basic adjustment thickness, determine the outlet thickness adjustment amount H of all racks between the first intermediate rack and the third intermediate rack. i delta , adjusting the outlet thicknesses of all racks between the first intermediate rack and the third intermediate rack, obtaining the outlet thicknesses of the corresponding intermediate racks after adjustment, and returning to step S2; wherein the third intermediate rack is an intermediate rack in front of the second intermediate rack;

[0012] When the equivalent load factor of the first intermediate rack is the maximum value, the H corresponding to the first intermediate rack is i delta for:

[0013] H i delta =h base

[0014] h base Indicates the foundation adjustment thickness;

[0015] When the equivalent load factor of the first intermediate rack is the minimum value, the H corresponding to the first intermediate rack i delta for:

[0016] H i delta =-h base

[0017] The adjustment amount H of the outlet thickness of each intermediate rack between the rack after the first intermediate rack and the third intermediate rack i deltafor:

[0018] H i delta =-H i-1 delta ·g i 入 / g i 出

[0019] H i-1 delta Indicates the adjustment amount of the outlet thickness of the previous rack of the current middle rack, g i λ Indicates the inlet load efficiency corresponding to the current middle rack, g i 出 Indicates the export load efficiency corresponding to the current middle rack.

[0020] Preferably, in the method for iteratively adjusting the cold rolling reduction distribution, step S2 further comprises:

[0021] The outlet speed of each intermediate rack in the intermediate rack is calculated according to the principle of equal second flow rate; wherein,

[0022] V i =V N ·H N / H i

[0023] V i represents the outlet speed of the ith intermediate rack, V N Indicates the pre-obtained export speed of the Nth rack, H N Indicates the initial outlet thickness of the Nth rack, H i represents the outlet thickness of the i-th intermediate rack.

[0024] Preferably, the method for iteratively adjusting the cold rolling reduction distribution comprises the following steps:

[0025] The initial intermediate thickness of each of the N racks is calculated using the predetermined initial first inlet thickness of the first rack and the predetermined initial first outlet thickness of the last rack, where:

[0026] H i =H i-1 ·(H N -H0) 1 / N

[0027] or

[0028] H i =H i-1 -(H0-H N ) / N

[0029] 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 first outlet thickness, and H0 represents the first inlet thickness.

[0030] Preferably, in the method for iteratively adjusting the cold rolling reduction distribution, in step S2, the predetermined load balancing method includes: a method of achieving load balancing according to rolling force, power or power ratio.

[0031] Preferably, the method for iteratively adjusting the cold rolling reduction distribution, wherein step S2 comprises:

[0032] When the load balance is achieved using the rolling force:

[0033]

[0034] g i represents the equivalent load factor of the i-th rack, F i represents the rolling force of the i-th stand, a i represents the balance coefficient of the i-th rack;

[0035] When load balancing is achieved using the power described above:

[0036]

[0037] P i represents the power of the i-th rack;

[0038] When the power ratio is used to achieve load balancing:

[0039]

[0040] P i max Indicates the maximum power of the i-th rack.

[0041] 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:

[0042]

[0043] h1=Δh+h2

[0044]

[0045]

[0046] α3=1.08-1.02·ε

[0047]

[0048] α7=α1·α3+α2

[0049]

[0050] R′=α9 2

[0051]

[0052] F represents the rolling force; h2, h1, C0 and α1 to α9 are predetermined temporary variables; μ t 、v、E、v R and E R is a predetermined constant;

[0053] 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;

[0054] μ represents the friction coefficient calculated by a predetermined friction model;

[0055] H represents the inlet thickness of the current rack, which is equal to the outlet thickness H of the previous rack i-1 , h represents H i , Δh represents the reduction amount, ε represents the reduction rate;

[0056] t b Represents the rear unit tension, t f Indicates the front unit tension;

[0057] R0 represents the original working roll radius, and R′ represents the working roll radius after flattening.

[0058] 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:

[0059]

[0060] P represents the power, B represents the width of the strip, T B Indicates 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.

[0061] Preferably, in the method for iteratively adjusting the cold rolling reduction distribution, in step S5, the inlet load efficiency and the outlet load efficiency calculated according to the equivalent load coefficient are:

[0062]

[0063] g i 出 represents the export load efficiency, g i 入 represents the inlet load efficiency, Δh i is the predetermined increment, g i ' represents the equivalent load factor calculated by step S2 after the outlet thickness is increased by the increment, g i represents the equivalent load factor.

[0064] On the other hand, an embodiment of the present invention provides a method for distributing reduction in a single-stand reversible cold rolling mill, comprising:

[0065] S1, obtaining the initial intermediate thickness of N predetermined passes of the single stand, wherein the N predetermined passes are arranged in a forward direction according to the order of entry and exit of the strip, the strip 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;

[0066] S2, calculating an equivalent load coefficient of each intermediate pass according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power, and maximum power of each intermediate pass;

[0067] S3, determining, based on the equivalent load coefficients of the intermediate passes, a first intermediate pass and a second intermediate pass corresponding to an extreme value of the equivalent load coefficient, wherein the extreme value includes a maximum value and a minimum value; wherein the first intermediate pass is before the second intermediate pass;

[0068] If the intermediate pass corresponding to the maximum value is the same as the intermediate pass corresponding to the maximum value of the equivalent load coefficient in the previous iteration stored in advance, and the intermediate pass corresponding to the minimum value is the same as the intermediate pass corresponding to the minimum value of the equivalent load coefficient in the previous iteration stored in advance, then the predetermined basic adjustment thickness is reduced according to a preset ratio; otherwise, the predetermined basic adjustment thickness is used;

[0069] S4, when the basic adjustment thickness is less than a predetermined value, ending the iteration;

[0070] S5, using the equivalent load coefficient to calculate the inlet load efficiency and outlet load efficiency of each intermediate pass, and according to the calculated corresponding inlet load efficiency and outlet load efficiency and the corresponding basic adjustment thickness, determine the outlet thickness adjustment amount H of all passes between the first intermediate pass and the third intermediate pass. i delta , adjusting the outlet thickness of all passes between the first intermediate pass and the third intermediate pass, obtaining the outlet thickness of the corresponding intermediate pass after adjustment, and returning to step S2; wherein the third intermediate pass is an intermediate pass preceding the second intermediate pass;

[0071] Among them, when the equivalent load coefficient of the first intermediate pass is the maximum value, the H corresponding to the first intermediate pass is i delta for:

[0072] H i delta =h base

[0073] h base Indicates the foundation adjustment thickness;

[0074] When the equivalent load factor of the first intermediate pass is the minimum value, the H corresponding to the first intermediate pass i delta for:

[0075] H i delta =-h base

[0076] The adjustment amount H of the outlet thickness of each intermediate pass between the pass after the first intermediate pass and the third intermediate pass i delta for:

[0077] H i delta =-H i-1 delta ·h i 入 / g i 出

[0078] H i-1 delta Indicates the adjustment amount of the outlet thickness of the previous pass of the current intermediate pass, h i 入 Indicates the entrance load efficiency corresponding to the current intermediate pass, h i 出 Indicates the export load efficiency corresponding to the current intermediate pass.

[0079] 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.

[0080] The above technical solution has the following technical effects:

[0081] The embodiment of the present invention obtains the initial intermediate thickness of each rack, calculates the equivalent load coefficient of each intermediate rack, and dynamically adjusts the outlet thickness of the intermediate rack according to the extreme value of the equivalent load coefficient. Specifically, the embodiment includes: determining the intermediate rack corresponding to the maximum and minimum values ​​of the effective load coefficient, adjusting the basic adjustment thickness according to the iteration history, calculating the inlet and outlet load efficiency of each rack, and adjusting the outlet thickness of the predetermined intermediate rack according to the arrangement order of the intermediate racks corresponding to the extreme values; when the basic adjustment thickness is less than the predetermined value, the iteration ends. The embodiment of the present invention ensures uniform load distribution, improves calculation speed and convergence, significantly improves the quality of cold-rolled products, reduces the number of strip breaks and shutdowns in the production process, reduces equipment loss, and improves production efficiency and economic benefits.

[0082] 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; the pressure distribution is further optimized to ensure the load balance of each rack, and the principle of equal second flow rate ensures uniform deformation of the strip between the racks, improving the thickness uniformity and surface quality of the strip, thereby improving the overall quality of the product;

[0083] In a further embodiment, the embodiment of the present invention does not have high requirements for the initial value of the pressure distribution, that is, it can quickly and accurately determine the initial thickness of each rack. 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.

[0084] In a further embodiment, through the extreme adjustment iteration method, the efficiency coefficient is taken into account when adjusting the outlet thickness of the intermediate frame, so the adjustment direction is very good, avoiding the jitter problem in the adjustment process. The entire calculation process is simple and the iteration speed is fast, overcoming the existing technology's dependence on initial pressure distribution and slow calculation problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] Figure 1 This is a flow chart of a method for iteratively adjusting the reduction distribution of tandem cold rolling according to one embodiment of the present invention;

[0086] Figure 2In a method for iteratively adjusting reduction distribution of tandem cold rolling according to an embodiment of the present invention, an iterative adjustment curve of initial intermediate thickness is obtained using a reduction distribution strategy of equal reduction;

[0087] Figure 3 In a method for iteratively adjusting reduction distribution of tandem cold rolling according to an embodiment of the present invention, an iterative adjustment curve of initial intermediate thickness is obtained using a reduction distribution strategy with a constant reduction rate;

[0088] Figure 4 In a method for iteratively adjusting the reduction distribution of a cold tandem rolling according to an 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 finished product;

[0089] Figure 5 In a method for iteratively adjusting the reduction distribution of a cold tandem rolling according to an 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;

[0090] Figure 6 FIG. 4 is a structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0091] To further illustrate various embodiments, the present invention is provided with accompanying drawings. These drawings form part of the present disclosure and are primarily used to illustrate the embodiments and, in conjunction with the relevant description in the specification, to explain the operating principles of the embodiments. By referring to these drawings, one of ordinary skill in the art will understand other possible embodiments and the advantages of the present invention. The components in the figures are not drawn to scale, and similar reference numerals are generally used to represent similar components.

[0092] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0093] Example 1:

[0094] In order to achieve the effects of simple calculation process, good convergence and fast calculation speed, and significantly improve the quality and production efficiency of cold-rolled products, an embodiment of the present invention provides a method for iteratively adjusting the cold rolling reduction distribution. Figure 1 Flowchart 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:

[0095] S1, obtaining the initial intermediate thickness of each of N racks. The N racks are arranged in a forward direction according to the order of strip entry and exit. The strip enters from the first rack, passes through N racks in sequence, and exits from the Nth rack. The N-1 racks of the N racks, excluding the Nth rack, are intermediate racks. The intermediate thickness includes the entry thickness and the exit thickness.

[0096] S2, calculating an equivalent load factor of each intermediate rack in the intermediate rack according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power, and maximum power of each intermediate rack in the intermediate rack;

[0097] S3, determining, based on the equivalent load coefficients of the intermediate racks, a first intermediate rack and a second intermediate rack corresponding to extreme values ​​of the equivalent load coefficients, where the extreme values ​​include a maximum value and a minimum value; wherein the first intermediate rack is arranged before the second intermediate rack;

[0098] If the intermediate rack corresponding to the maximum value is the same rack as the intermediate rack corresponding to the maximum equivalent load factor in the previous iteration stored in advance, and the intermediate rack corresponding to the minimum value is the same rack as the intermediate rack corresponding to the minimum equivalent load factor in the previous iteration stored in advance, then the predetermined basic adjustment thickness is reduced according to a preset ratio; otherwise, the predetermined basic adjustment thickness is used;

[0099] S4, when the base adjustment thickness is less than a predetermined value, the iteration ends;

[0100] S5, using the equivalent load coefficient to calculate the inlet load efficiency and outlet load efficiency of each intermediate rack, and according to the calculated corresponding inlet load efficiency and outlet load efficiency and the corresponding basic adjustment thickness, determine the outlet thickness adjustment amount H of all racks between the first intermediate rack and the third intermediate rack. i delta , adjusting the outlet thickness of all racks between the first intermediate rack and the third intermediate rack, obtaining the outlet thickness of the corresponding intermediate rack after adjustment, and returning to step S2; wherein the third intermediate rack is an intermediate rack in front of the second intermediate rack;

[0101] Among them, when the equivalent load factor of the first intermediate rack is the maximum value, the H corresponding to the first intermediate rack is i delta for:

[0102] H i delta =h base

[0103] h base Indicates the foundation adjustment thickness;

[0104] When the equivalent load factor of the first intermediate rack is the minimum, the H corresponding to the first intermediate rack i delta for:

[0105] H i delta =-h base

[0106] Adjustment amount H of the outlet thickness of each intermediate rack between the rack after the first intermediate rack and the third intermediate rack i delta for:

[0107] H i delta =-H i-1 delta ·g i 入 / g i 出

[0108] H i-1 delta Indicates the adjustment amount of the outlet thickness of the previous rack of the current middle rack, g i 入 Indicates the inlet load efficiency corresponding to the current middle rack, g i 出 Indicates the export load efficiency corresponding to the current middle rack.

[0109] Example 2:

[0110] In order to improve the product quality of a cold rolling mill, overcome the problem of slow adjustment speed caused by unclear adjustment purpose during the calculation of cold rolling reduction distribution, and weaken the requirement for initial reduction distribution, an embodiment of the present invention proposes a method for iteratively adjusting the cold rolling reduction distribution, which calculates the middle thickness of the frame through limit adjustment and iteratively determines whether the calculation accuracy requirement is met. Preferably, the cold rolling mill is a five-stand cold rolling mill; specifically, the method includes:

[0111] S101, obtaining a load balancing mode and a balancing coefficient for cold rolling;

[0112] Preferably, the load balancing method includes: a method of achieving load balancing based on rolling force, power or power ratio;

[0113] Preferably, the balance coefficient includes: proportional balance or custom balance;

[0114] Preferably, the load balancing method and balancing coefficient are manually preset based on process experience;

[0115] In a specific embodiment, considering good plate shape and stable production, rolling force balance is selected as the load balancing method, and the balance coefficients of the five stands are [1.2, 1.1, 1, 1, 0.9].

[0116] S201, obtaining production data of the strip steel;

[0117] 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.

[0118] In a specific embodiment, the production data of the strip steel is obtained as shown in Table 1 below:

[0119] 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

[0120] Table 1

[0121] S301, determining an initial reduction distribution system, that is, determining an initial middle thickness of each rack among N racks;

[0122] Preferably, the intermediate thickness includes: an inlet thickness and an outlet thickness;

[0123] N stands are arranged in a forward direction according to the order of strip in and out. The strip enters from the first stand, passes through N stands in sequence, and exits from the Nth stand. That is, the exit thickness of the previous stand is the entrance thickness of the next stand. Among the N stands, the N-1 stands except the Nth stand are intermediate stands.

[0124] 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;

[0125] In a specific embodiment, the initial intermediate thickness of each of the N racks is calculated using the predetermined initial first inlet thickness of the first rack and the predetermined initial first outlet thickness of the last rack, wherein:

[0126] H i =H i-1 ·(H N / H0) 1 / N

[0127] or

[0128] H i =H i-1 -(H0-H N ) / N

[0129] 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.

[0130] In a specific embodiment, the initial thickness of the five-stand cold rolling mill under different reduction distribution systems is shown in Table 2 below:

[0131] Suppress the distribution system Initial outlet thickness 1 Isobaric reduction 2.100,1.700,1.300,0.900 2 Isobaric reduction rate 1.812,1.313,0.952,0.690 3 Close to the finished product 0.700,0.660,0.620,0.580 4 Close to raw materials 2.400,2.300,2.200,2.100

[0132] Table 2

[0133] S401, calculating the equivalent load factor of each intermediate stand according to the load balancing method and the balance coefficient, rolling force, power, and maximum power of each intermediate stand, including:

[0134] S402, calculate the outlet speed of each intermediate rack according to the principle of equal second flow rate. The outlet speed directly affects the friction coefficient, where:

[0135] V i =V N ·H N / H i

[0136] V i represents the outlet speed of the ith intermediate rack, V N Indicates the pre-obtained export speed of the Nth rack, H N Indicates the initial outlet thickness of the Nth rack, H i represents the outlet thickness of the i-th intermediate rack;

[0137] S403, calculating the equivalent load factor of each intermediate rack in sequence;

[0138] When rolling force balance is used to achieve load balance:

[0139]

[0140] g i represents the equivalent load factor of the i-th rack, F i represents the rolling force of the i-th stand, a i represents the balance coefficient of the i-th rack;

[0141] When power balancing is used to achieve load balancing:

[0142]

[0143] P i represents the power of the i-th rack;

[0144] When power ratio balancing is used to achieve load balancing:

[0145]

[0146] P i max Indicates the maximum power of the i-th rack.

[0147] The rolling force is obtained through a predetermined calculation model, which is:

[0148]

[0149] h1=Δh+h2

[0150]

[0151] α3=1.08-1.02·ε

[0152]

[0153]

[0154] α7=α1·α3+α2

[0155]

[0156] R′=α9 2

[0157]

[0158] 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. In a specific implementation, its value is: t =0.7, v=0.3, E=210000, v R =0.3, E R =210000;

[0159] 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;

[0160] μ represents the friction coefficient calculated by a predetermined friction model;

[0161] 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 reduction amount, ε represents the reduction rate;

[0162] t b Represents the rear unit tension, t f Indicates the front unit tension;

[0163] R0 represents the original working roll radius, and R′ represents the working roll radius after flattening;

[0164] The power is obtained through a predetermined power calculation model, wherein the power calculation model is:

[0165]

[0166] P represents power, B represents the width of the strip, T B Indicates 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.

[0167] S501: Determine, based on the equivalent load coefficients of the intermediate racks, a first intermediate rack j and a second intermediate rack k corresponding to extreme values ​​of the equivalent load coefficients, where the extreme values ​​include a maximum value and a minimum value; wherein the first intermediate rack is arranged before the second intermediate rack, i.e., 1≤j<k≤N;

[0168] If the intermediate rack corresponding to the maximum value is the same rack as the intermediate rack corresponding to the maximum equivalent load factor in the previous iteration stored in advance, and the intermediate rack corresponding to the minimum value is the same rack as the intermediate rack corresponding to the minimum equivalent load factor in the previous iteration stored in advance, then the predetermined basic adjustment thickness is reduced according to a preset ratio; otherwise, the predetermined basic adjustment thickness is used;

[0169] Preferably, the predetermined basic adjustment thickness is reduced according to a preset ratio:

[0170] h base =h base / 2

[0171] Among them, h base Indicates the foundation adjustment thickness;

[0172] Preferably, the initial value of the predetermined basic adjustment thickness is 0.1 mm.

[0173] S601, when the base adjustment thickness is less than a predetermined value, the iteration ends;

[0174] Preferably, when h base When the value is less than 0.00001mm, the iteration ends and the calculation is completed;

[0175] Preferably, the operating speed can be further increased by increasing the initial value of the basic adjustment thickness or changing the exit predetermined value of the basic adjustment thickness.

[0176] S701: Calculate the inlet load efficiency and outlet load efficiency of each intermediate rack using the equivalent load coefficient, and determine the outlet thickness adjustment amount H of all racks between the first intermediate rack and the third intermediate rack based on the calculated corresponding inlet load efficiency and outlet load efficiency and the corresponding basic adjustment thickness.i delta , adjusting the outlet thickness of all racks between the first intermediate rack and the third intermediate rack, obtaining the outlet thickness of the corresponding intermediate rack after adjustment, and returning to step S2; wherein the third intermediate rack is an intermediate rack in front of the second intermediate rack;

[0177] Preferably, the inlet load efficiency and outlet load efficiency of each intermediate rack are calculated based on the equivalent load coefficient as follows:

[0178]

[0179] g i 出 Indicates the export load efficiency, g i 入 Indicates the inlet load efficiency, Δh i is the predetermined increment, g i ' represents the equivalent load factor calculated in step S403 after the outlet thickness is increased by a predetermined increment;

[0180] Preferably, Δh i 0.001mm;

[0181] Preferably, when the equivalent load factor of the first intermediate rack is the maximum value, the H corresponding to the first intermediate rack is i delta for:

[0182] H i delta =h base

[0183] h base Indicates the foundation adjustment thickness;

[0184] When the equivalent load factor of the first intermediate rack is the minimum, the H corresponding to the first intermediate rack i delta for:

[0185] H i delta =-h base

[0186] Adjustment amount H of the outlet thickness of each intermediate rack between the rack after the first intermediate rack and the third intermediate rack i delta for:

[0187] H d delta =-H i-1 delta ·g i 入 / g i出 H i-1 delta Indicates the adjustment amount of the outlet thickness of the previous rack of the current middle rack, g i 入 Indicates the inlet load efficiency corresponding to the current middle rack, g i 出 Indicates the export load efficiency corresponding to the current middle rack.

[0188] In a specific embodiment, adjusting the outlet thickness of the i-th rack will affect the equivalent loads of the i-th and i+1-th racks simultaneously. Specifically, increasing the outlet thickness of the i-th rack will reduce the equivalent load of the i-th rack while increasing the equivalent load of the i+1-th rack. Conversely, decreasing the outlet thickness of the i-th rack will increase the equivalent load of the i-th rack while reducing the equivalent load of the i+1-th rack.

[0189] For example, if the equivalent load factor of the second rack is the largest and the equivalent load factor of the fourth rack is the smallest, then the outlet thickness of the second and third racks will be increased; or if the equivalent load factor of the third rack is the smallest and the equivalent load factor of the fifth rack is the largest, then the outlet thickness of the third and fourth racks will be reduced.

[0190] Specifically, the outlet thickness adjustment amount of each intermediate rack is as follows:

[0191] When the jth rack is the rack with the maximum equal efficiency load factor,

[0192] H j delta =h base

[0193] When the jth rack is the rack with the minimum equal efficiency load factor,

[0194] H j delta =-h base

[0195] In addition, the outlet thickness adjustment amount from the j+1th rack to the k-1th rack, i.e., another extreme rack, is:

[0196] H i delta =-H i-1 delta ·g i 入 / g i 出

[0197] The thickness of the next iteration is H i for:

[0198] Hi =H i +H i delta .

[0199] Figure 2 In a method for iteratively adjusting reduction distribution of tandem cold rolling according to an embodiment of the present invention, an iterative adjustment curve of initial intermediate thickness is obtained using a reduction distribution strategy of equal reduction; Figure 3 In a method for iteratively adjusting reduction distribution of tandem cold rolling according to an embodiment of the present invention, an iterative adjustment curve of initial intermediate thickness is obtained using a reduction distribution strategy with a constant reduction rate; Figure 4 In a method for iteratively adjusting the reduction distribution of a cold tandem rolling according to an 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 finished product; Figure 5 In a method for iteratively adjusting the reduction distribution of a cold tandem rolling mill according to an embodiment of the present invention, an iterative adjustment curve of the initial intermediate thickness is obtained using a reduction distribution strategy close to the raw material. This embodiment includes a five-stand cold tandem rolling mill, four of which are intermediate stands.

[0200] like Figure 2 、 Figure 3 、 Figure 4 as well as Figure 5 As shown in the figure, the abscissa represents the number of iterations, the ordinate represents the outlet thickness, and the four curves correspond to the adjustment curves of the four intermediate stands of the five-stand tandem cold rolling mill. After adjustment by the method of the embodiment of the present invention, the outlet thicknesses of the four intermediate stands of the five-stand tandem cold rolling mill under different pressure distribution strategies are 1.610, 1.113, 0.829, and 0.609, respectively. The number of iterations is shown in Table 3 below. That is, the method of the embodiment of the present invention does not have high requirements for the initial intermediate thickness of each intermediate stand. Different initial intermediate thicknesses do not affect the final result. However, the closer the initial intermediate thickness is to the final result, the fewer the number of iterations.

[0201] illustrate Number of iterations 1 Isobaric reduction 93 2 Isobaric reduction rate 51 3 Close to the finished product 113 4 Close to raw materials 216

[0202] Table 3

[0203] Implementation three:

[0204] The above-mentioned method for a multi-stand main body of the embodiment of the present invention can be easily converted to a single-stand reversible cold rolling mill for use. Therefore, this embodiment of the present invention provides a method for pressure distribution of a single-stand reversible cold rolling mill, by converting multiple stands into multiple passes of a single stand, and converting the intermediate stands into the intermediate passes of the single-stand multiple passes. The remaining calculation processes can be applied based on the above-mentioned conversion, that is, the method for pressure distribution of a single-stand reversible cold rolling mill of this embodiment has the same inventive concept as the method for pressure distribution of a multi-stand reversible cold rolling mill described above. Specifically, the method for pressure distribution of a single-stand reversible cold rolling mill of this embodiment includes:

[0205] S1, obtaining the initial intermediate thickness of N predetermined passes of a single stand, wherein the N predetermined passes are arranged in a forward direction according to the order of entry and exit of the strip, the strip enters from the first pass, enters and exits the rolling of N passes in sequence, and exits from the Nth pass. Among the N predetermined passes, N-1 passes other than the Nth pass are intermediate passes, wherein the intermediate thickness includes: entry thickness and exit thickness;

[0206] S2, calculating an equivalent load factor of each intermediate pass according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power, and maximum power of each intermediate pass;

[0207] S3, determining, based on the equivalent load coefficients of the intermediate passes, a first intermediate pass and a second intermediate pass corresponding to an extreme value of the equivalent load coefficient, wherein the extreme value includes a maximum value and a minimum value; wherein the first intermediate pass is in front of the second intermediate pass;

[0208] If the intermediate pass corresponding to the maximum value is the same as the intermediate pass corresponding to the maximum value of the equivalent load coefficient in the previous iteration stored in advance, and the intermediate pass corresponding to the minimum value is the same as the intermediate pass corresponding to the minimum value of the equivalent load coefficient in the previous iteration stored in advance, then the predetermined basic adjustment thickness is reduced according to a preset ratio; otherwise, the predetermined basic adjustment thickness is used;

[0209] S4, when the base adjustment thickness is less than a predetermined value, the iteration ends;

[0210] S5, using the equivalent load coefficient to calculate the inlet load efficiency and outlet load efficiency of each intermediate pass, and according to the calculated corresponding inlet load efficiency and outlet load efficiency and the corresponding basic adjustment thickness, determine the outlet thickness adjustment amount H of all passes from the first intermediate pass to the third intermediate pass. i delta , adjusting the outlet thickness of all passes between the first intermediate pass and the third intermediate pass, obtaining the outlet thickness of the corresponding intermediate pass after adjustment, and returning to step S2; wherein the third intermediate pass is an intermediate pass before the second intermediate pass;

[0211] Among them, when the equivalent load factor of the first intermediate pass is the maximum value, the H corresponding to the first intermediate pass is i delta for:

[0212] H i delta =h base

[0213] h base Indicates the foundation adjustment thickness;

[0214] When the equivalent load factor of the first intermediate pass is the minimum, the H corresponding to the first intermediate pass i delta for:

[0215] H i delta =-h base

[0216] Adjustment amount H of the outlet thickness of each intermediate pass from the first intermediate pass to the third intermediate pass i delta for:

[0217] H i delta =HH i-1 delta ·g i 入 / g i 出

[0218] H i-1 delta Indicates the adjustment amount of the outlet thickness of the previous pass of the current intermediate pass, g i 入 Indicates the entrance load efficiency corresponding to the current intermediate pass, g i 出 Indicates the export load efficiency corresponding to the current intermediate pass.

[0219] Example 4:

[0220] 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 first embodiment of the present invention are implemented.

[0221] Furthermore, as an executable solution, the electronic device may be a computer unit, which may be a computing device such as a desktop computer, laptop, PDA, or cloud server. The computer unit may include, but is not limited to, a processor and memory. Those skilled in the art will appreciate that the aforementioned computer unit structure is merely an example and does not constitute a limitation of the computer unit. The computer unit may include more or fewer components than those described above, or a combination of certain components, or different components. For example, the computer unit may also include input / output devices, network access devices, buses, etc., which are not limited in the embodiments of the present invention.

[0222] Furthermore, as an executable solution, the processor may be a central processing unit (CPU), or 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. The general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the computer unit, and various parts of the entire computer unit are connected using various interfaces and lines.

[0223] The memory can be used to store the computer programs and / or modules, and the processor implements the various functions of the computer unit by running or executing the computer programs and / or modules 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 based on 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 (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0224] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A method for iteratively adjusting the reduction distribution of cold rolling, characterized in that: include: S1, obtaining an initial intermediate thickness of each of N racks, wherein the N racks are arranged in a forward direction according to the order of strip entry and exit, the strip entering from the first rack, sequentially passing through the N racks for rolling, and exiting from the Nth rack, wherein N-1 racks of the N racks excluding the Nth rack are intermediate racks, wherein the intermediate thickness includes an entry thickness and an exit thickness; S2, calculating an equivalent load factor of each intermediate rack in the intermediate rack according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power, and maximum power of each intermediate rack in the intermediate rack; S3: Determine, based on the equivalent load coefficients of the intermediate racks, a first intermediate rack and a second intermediate rack corresponding to extreme values ​​of the equivalent load coefficients, where the extreme values ​​include a maximum value and a minimum value; wherein the first intermediate rack is arranged before the second intermediate rack; If the intermediate rack corresponding to the maximum value is the same rack as the intermediate rack corresponding to the maximum equivalent load coefficient in the previous iteration stored in advance, and the intermediate rack corresponding to the minimum value is the same rack as the intermediate rack corresponding to the minimum equivalent load coefficient in the previous iteration stored in advance, then the basic adjustment thickness is reduced according to a preset ratio; otherwise, the initial basic adjustment thickness is used; S4, when the basic adjustment thickness is less than a predetermined value, ending the iteration; S5, using the equivalent load coefficient to calculate the inlet load efficiency and outlet load efficiency of each intermediate rack, and according to the calculated corresponding inlet load efficiency and outlet load efficiency and the corresponding basic adjustment thickness, determine the outlet thickness adjustment amount H of all racks between the first intermediate rack and the third intermediate rack. i delta , adjusting the outlet thicknesses of all racks between the first intermediate rack and the third intermediate rack, obtaining the outlet thicknesses of the corresponding intermediate racks after adjustment, and returning to step S2; wherein the third intermediate rack is an intermediate rack in front of the second intermediate rack; When the equivalent load factor of the first intermediate rack is the maximum value, the H corresponding to the first intermediate rack is i delta for: H i delta =h base h base Indicates the foundation adjustment thickness; When the equivalent load factor of the first intermediate rack is the minimum value, the H corresponding to the first intermediate rack i delta for: H i delta =-h base The outlet thickness adjustment amount H of each intermediate frame between the frame after the first intermediate frame and the third intermediate frame i delta for: H i delta =-H i-1 delta ·g i 入 / g i 出 H i-1 delta Indicates the outlet thickness adjustment of the previous rack of the current middle rack, g i 入 Indicates the inlet load efficiency corresponding to the current middle rack, g i 出 Indicates the export load efficiency corresponding to the current middle rack.

2. The method for iteratively adjusting the cold rolling reduction distribution according to claim 1, characterized in that: The step S2 further includes: The outlet speed of each intermediate rack in the intermediate rack is calculated according to the principle of equal second flow rate; wherein, V i =V N ·H N / H i V i represents the outlet speed of the ith intermediate rack, V N Indicates the pre-obtained export speed of the Nth rack, H N Indicates the initial outlet thickness of the Nth rack, H i represents the outlet thickness of the i-th intermediate 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 using 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 previous rack of the i-th rack, which is equal to the inlet thickness of the i-th rack, H N represents the first outlet thickness, H0 represents the first inlet thickness, H i represents the outlet thickness of the i-th rack.

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: g i represents the equivalent load factor of the i-th rack, F i represents the rolling force of the i-th stand, a i represents the balance coefficient of the i-th rack; When load balancing is achieved using the power described above: P i represents the power of the i-th rack; When the power ratio is used to achieve load balancing: P i max Indicates the maximum power of 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 through 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 to 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 represents H i , Δh represents the reduction amount, 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 the power, B represents the width of the strip, T B Indicates post-tension, T F Indicates the front tension, V r represents the roll speed, η1 represents the reduction ratio, η2 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.

8. A method for distributing reduction in a single-stand reversible cold rolling mill, characterized in that: include: S1, obtaining the initial intermediate thickness of N predetermined passes of a single stand, wherein the N predetermined passes are arranged in a forward direction according to the order of entry and exit of the strip, the strip 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 an equivalent load coefficient of each intermediate pass according to a predetermined load balancing method and a predetermined balance coefficient, rolling force, power, and maximum power of each intermediate pass; S3, determining, based on the equivalent load coefficients of the intermediate passes, a first intermediate pass and a second intermediate pass corresponding to an extreme value of the equivalent load coefficient, wherein the extreme value includes a maximum value and a minimum value; wherein the first intermediate pass is before the second intermediate pass; If the intermediate pass corresponding to the maximum value is the same as the intermediate pass corresponding to the maximum value of the equivalent load coefficient in the previous iteration stored in advance, and the intermediate pass corresponding to the minimum value is the same as the intermediate pass corresponding to the minimum value of the equivalent load coefficient in the previous iteration stored in advance, then the basic adjustment thickness is reduced according to a preset ratio; otherwise, the initial basic adjustment thickness is used; S4, when the basic adjustment thickness is less than a predetermined value, ending the iteration; S5, using the equivalent load coefficient to calculate the inlet load efficiency and outlet load efficiency of each intermediate pass, and according to the calculated corresponding inlet load efficiency and outlet load efficiency and the corresponding basic adjustment thickness, determine the outlet thickness adjustment amount H of all passes between the first intermediate pass and the third intermediate pass. i delta , adjusting the outlet thickness of all passes between the first intermediate pass and the third intermediate pass, obtaining the outlet thickness of the corresponding intermediate pass after adjustment, and returning to step S2; wherein the third intermediate pass is an intermediate pass preceding the second intermediate pass; Among them, when the equivalent load coefficient of the first intermediate pass is the maximum value, the H corresponding to the first intermediate pass is i delta for: H i delta =h base h base Indicates the foundation adjustment thickness; When the equivalent load factor of the first intermediate pass is the minimum value, the H corresponding to the first intermediate pass i delta for: H i delta =-h base The outlet thickness adjustment amount H of each intermediate pass from the pass after the first intermediate pass to the third intermediate pass i delta for: H i delta =-H i-1 delta ·g i 入 / g i 出 H i-1 delta Indicates the outlet thickness adjustment amount of the previous pass of the current intermediate pass, g i 入 Indicates the entrance load efficiency corresponding to the current intermediate pass, g i 出 Indicates the export load efficiency corresponding to the current intermediate pass.

9. 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 according to any one of claims 1 to 8.

Images