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 racks is obtained, and the racks except the last rack in the racks are middle racks; s2, calculating an equivalent load coefficient; s3, determining a middle rack corresponding to the extreme value of the equivalent load coefficient; if the middle rack corresponding to the maximum value and the middle rack corresponding to the previous maximum value are the same rack and the middle rack corresponding to the minimum value and the middle rack corresponding to the previous minimum value are the same rack, the basic adjusting thickness is reduced in proportion; otherwise, adjusting the thickness by using a preset base; s4, when the basic adjustment thickness is smaller than a pre-value, iteration is ended; and S5, calculating inlet load efficiency and outlet load efficiency by using the equivalent load coefficient, determining the outlet thickness adjustment amount of the predetermined rack, performing adjustment to obtain the adjusted outlet thickness, and returning to the step S2. By means of the technical scheme, the quality and production efficiency of cold-rolled products can be 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. Although traditional reduction distribution methods such as the empirical method are simple and easy to implement, they are highly dependent on the operator's experience and it is difficult to achieve the optimal reduction distribution result. The most widely used method is the iterative method, such as the Newton-Raphson method, which obtains the intermediate thickness through repeated calculations. However, this method is complex to calculate and is extremely demanding on the initial value of the intermediate thickness. If the initial value is not selected 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 also some directional iterative methods, such as the combination of initial pressure distribution and dynamic pressure adjustment. These methods gradually optimize the pressure distribution by initially distributing the pressure and gradually adjusting the pressure of each rack. However, these methods also have the problem of high requirements for initial pressure distribution, and jitter is prone to occur during the adjustment process, resulting in slow calculation speed. Although these methods have improved the calculation 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 cold rolling reduction distribution, 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] 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 equivalent load factor of each intermediate frame 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, according to the size of the equivalent load coefficient of each intermediate rack in the intermediate racks, determining the first intermediate rack and the second intermediate rack corresponding to the extreme value of the equivalent load coefficient, wherein the extreme value includes a maximum value and a minimum value; wherein the first intermediate rack is arranged in front of 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 value of the 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 value of the 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;

[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 the outlet load efficiency of each intermediate rack, and determining the outlet thickness adjustment amount H of all racks between the first intermediate rack and the third intermediate rack according to 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;

[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 frame between the frame after the first intermediate frame and the third intermediate frame 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 intermediate 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; wherein,

[0022] V i =V N ·H N / H i

[0023] 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.

[0024] Preferably, the method for iteratively adjusting the cold rolling reduction distribution comprises step S1:

[0025] 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:

[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 for 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 ith stand, a i represents the balance coefficient of the i-th rack;

[0035] When the power is used to achieve load balancing:

[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 Represents 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-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 means H i , Δh represents the amount of reduction, 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 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.

[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 pressure reduction of a single-stand reversible cold rolling mill, which includes:

[0065] 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;

[0066] S2, calculating the equivalent load coefficient of each intermediate pass 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;

[0067] S3, according to the size of the equivalent load coefficient of each intermediate pass in the intermediate passes, determining the first intermediate pass and the second intermediate pass corresponding to the 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;

[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 factor 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 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;

[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 the 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 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;

[0071] 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:

[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 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 rack corresponding to the extreme value; 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 belt 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; 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;

[0083] 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, the initial thickness of each frame can be determined quickly and accurately. 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 reliance on initial pressure distribution and slow calculation problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] 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;

[0086] Figure 2In 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;

[0087] 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;

[0088] 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;

[0089] 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;

[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 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.

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

[0093] Embodiment 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 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:

[0095] S1, obtaining the initial intermediate thickness of each of the N racks, 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, the N-1 racks of the N racks except the Nth rack are intermediate racks, wherein the intermediate thickness includes: entrance thickness and exit thickness;

[0096] S2, calculating an equivalent load factor of each intermediate frame in the intermediate frame 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 frame;

[0097] S3, according to the size of the equivalent load coefficient of each intermediate rack in the intermediate racks, determine the first intermediate rack and the second intermediate rack corresponding to the extreme value of the equivalent load coefficient, the extreme value includes a maximum value and a minimum value; wherein the first intermediate rack is arranged in front of 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 value of the 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 value of the 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 the 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 to the third intermediate rack i delta , adjusting the outlet thickness of all racks between the first intermediate rack to 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 value, the H corresponding to the first intermediate rack i delta for:

[0105] H i delta =-h base

[0106] 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 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 intermediate 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] Embodiment 2:

[0110] In order to improve the product quality of the cold rolling mill, overcome the problem of slow adjustment speed caused by unclear adjustment purpose in the calculation process 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 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 method and a balancing coefficient of cold rolling;

[0112] Preferably, the load balancing method includes: a method of achieving load balancing according to 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 preset manually through process experience;

[0115] In a specific embodiment, taking into account good plate shape and stable production, the load balancing method selects rolling force balance, 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 pressing distribution system, that is, determining an initial middle thickness of each rack among the N racks;

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

[0123] 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.

[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 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:

[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 frame according to the load balancing method and the balance coefficient, rolling force, power and maximum power of each intermediate frame, including:

[0134] 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,

[0135] V i =V N ·H N / H i

[0136] 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;

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

[0138] When the 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 ith 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 Represents the maximum power of the i-th rack.

[0147] Among them, the rolling force is obtained through a predetermined calculation model, and the calculation model 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 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;

[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 amount of reduction, 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 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.

[0167] S501, according to the size of the equivalent load coefficient of each intermediate rack, determine the first intermediate rack j and the second intermediate rack k corresponding to the extreme value of the equivalent load coefficient, the extreme value includes a maximum value and a minimum value; wherein the first intermediate rack is arranged in front of the second intermediate rack, that is, 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 value of the 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 value of the 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 <0.00001mm, the iteration ends and the calculation is completed;

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

[0176] S701, using the equivalent load coefficient to calculate the inlet load efficiency and the 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 to the third intermediate racki delta , adjusting the outlet thickness of all racks between the first intermediate rack to 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 the outlet load efficiency of each intermediate rack are calculated according to 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 by 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 value, the H corresponding to the first intermediate rack i delta for:

[0185] H i delta =-h base

[0186] 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 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 intermediate 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 at the same time; specifically, increasing the outlet thickness of the i-th rack will reduce the equivalent load of the i-th rack and increase the equivalent load of the i+1-th rack; while reducing the outlet thickness of the i-th rack will increase the equivalent load of the i-th rack and reduce 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, the outlet thickness of the second rack and the third rack is 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, the outlet thickness of the third rack and the fourth rack is 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 value 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 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 5 In the method for iteratively adjusting the cold rolling reduction distribution of an embodiment of the present invention, the reduction distribution strategy close to the raw material is used to obtain an iterative adjustment curve diagram of the initial intermediate thickness. This embodiment includes a five-stand cold rolling mill, four of which are middle stands.

[0200] like Figure 2 , Figure 3 , Figure 4 as well as Figure 5 As shown, 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 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 iterations 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 iterations.

[0201] illustrate 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-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:

[0205] S1, obtaining the initial intermediate thickness of N predetermined passes of a single stand, wherein the N predetermined passes are arranged in a positive direction according to the order of the strip entering and exiting, the strip enters from the first pass, enters and exits the rolling of N passes in sequence, and exits from the Nth pass, and the N-1 passes except the Nth pass among the N predetermined passes are intermediate passes, wherein the intermediate thickness includes: entrance thickness and exit thickness;

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

[0207] S3, according to the size of the equivalent load coefficient of each intermediate pass in the intermediate passes, determining the first intermediate pass and the second intermediate pass corresponding to the extreme value of the equivalent load coefficient, 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 factor 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 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;

[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] The adjustment amount H of the outlet thickness of each intermediate pass from the pass after 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] Embodiment 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 method embodiment of the first embodiment of the present invention are implemented.

[0221] 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.

[0222] 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 various parts of the entire computer unit.

[0223] 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.

[0224] 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 equivalent load factor of each intermediate frame 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, according to the size of the equivalent load coefficient of each intermediate rack in the intermediate racks, determining the first intermediate rack and the second intermediate rack corresponding to the extreme value of the equivalent load coefficient, wherein the extreme value includes a maximum value and a minimum value; wherein the first intermediate rack is arranged in front of 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 value of the 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 value of the 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; 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 the outlet load efficiency of each intermediate rack, and determining the outlet thickness adjustment amount H of all racks between the first intermediate rack and the third intermediate rack according to 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; 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 represents 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 adjustment amount H of the outlet thickness 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 adjustment amount of the outlet thickness of the previous rack of the current intermediate 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 comprises: The outlet speed of each intermediate rack in 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 It represents the initial outlet thickness of the Nth rack, H i represents the outlet thickness of the ith 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 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 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.

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 ith stand, a i represents the balance coefficient of the i-th rack; When the power is used to achieve load balancing: P i represents the power of the i-th rack; When the power ratio is used to achieve load balancing: P i mmax Represents 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 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 the 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 S5, the inlet load efficiency and the outlet load efficiency calculated according to the equivalent load coefficient are: 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.

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 equivalent load coefficient of each intermediate pass 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, according to the size of the equivalent load coefficient of each intermediate pass in the intermediate passes, determining the first intermediate pass and the second intermediate pass corresponding to the 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; 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 factor 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 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; 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 the 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 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; Among them, when the equivalent load factor of the first intermediate pass is the maximum value, the H corresponding to the first intermediate pass i delta for: H i delta =h base h base represents 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 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: H i 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 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.

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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