Pinch roll process parameter and roll shape curve optimization method for reducing abrasion loss of circle shear

Abstract

The invention provides a pinch roll process parameter and roll shape curve optimization method for reducing the abrasion loss of a disc shear. The method comprises the following steps: A) quantitative calculation of the abrasion loss of a disc shear disc: calculating the abrasion loss of the disc shear under the action of an additional force according to the additional shear force generated by the disc shear disc due to strip steel deviation; b) optimizing process parameters of the pinch roll: optimizing the parameters by taking the abrasion loss of the disc shear as a target function and taking the clamping force as a variable; finding out the corresponding clamping force of the pinch roll when the abrasion loss of the cutter head is minimum; whether the abrasion loss of the circle shear meets the normal service cycle range or not is judged, if yes, roller shape curve optimization does not need to be carried out, and if not, the step C is carried out to carry out pinch roller shape curve optimization; c) optimizing the roll shape curve of the pinch roll: optimizing roll shape parameters by taking the deviation amount of the strip steel under the action of the pinch roll as a target function and taking the roll shape of the pinch roll as a variable; and finding out a roll type curve parameter when the strip steel deviation reaches the minimum under the action of the pinch roll.

Description

Technical Field

[0001] The invention belongs to the technical field of shearing of rolled steel strips in metal rolling, and particularly relates to a method for optimizing process parameters of pinch rollers and roller profile curves for reducing the wear of disc shears. Background Art

[0002] The production of tinplate generally includes uncoiling, head and tail cutting, welding, edge cutting, alkali washing, pickling, soft melting, passivation, oiling, testing, coiling and other process flows. Among them, the quality of the disc shearing edge will not only affect the quality of the finished strip, but also affect the stability of the unit during operation. The thickness of tinplate products is generally in the range of 0.15-0.55mm. The thinner the product thickness, the more difficult it is to control the edge cutting quality. Therefore, a pinch roller is arranged at the front end of the disc shearing edge process to ensure the tension stability and the centering of the strip during the shearing process, and improve the shearing quality of the unit. The general roller type of the pinch roller includes T-roller, cos roller type, sin roller type and flat roller. Among them, in order to improve the correction effect of the pinch roller, T-roller, sin or cos roller curve is generally used. The correction effect of the strip depends to a large extent on the roller curve of the pinch roller. If the strip fails to correct the deviation in time after passing through the pinch roller, additional force will be generated during the shearing process, resulting in the disc shear in an abnormal shearing state and increasing the wear of the disc shear.

[0003] The Chinese patent document with application number 202210385916.8 provides a system and method for predicting the timing of disc shear tool change based on disc wear detection. It proposes a disc shear tool change method based on image recognition technology, analyzes the relationship between the amount of disc wear and the amount of steel overload, but does not analyze the situation of abnormal wear of the disc.

[0004] The Chinese patent document with application number 202110370739.1 provides a method, system and industrial control equipment for determining the mileage of a circular shears disc. It analyzes the mapping relationship between strip strength, strip information and disc wear coefficient, as well as the maximum wear of the disc shear, and realizes the prediction of the shearing mileage of the disc shear, but does not analyze the abnormal wear caused by the strip deviation.

[0005] The Chinese patent document with application number 202010749997.6 provides a method and device for tension correction control of pinch rolls in thin strip continuous casting, which realizes strip correction control by PID control of the target angle and the actual roll gap inclination of the pinch rolls, but does not involve the optimization of the pinch roll force and roller curve.

[0006] Chinese patent document with application number 201920334623.0 provides a pinch roller type that can increase the service life of the pinch roller, which increases the service life of the pinch roller by arranging a protrusion at the end of the shaft, but this structure is not suitable for tinplate pinch rollers.

[0007] The Chinese patent document with application number 202210631402.6 provides a method and system for determining the roller shape of a pinch roller, which selects the required roller shape of the pinch roller according to the required tension of the strip, but does not propose a method for designing the deviation-correcting roller shape of the pinch roller. Summary of the invention

[0008] The technical problem to be solved by the present invention is to solve the abnormal wear of the disc shears caused by the deviation of the strip after the tinplate passes through the pinch rollers, further ensure the service life of the disc shears of the tinplating unit and the quality of the strip cutting, and provide a set of pinch roller process parameters and roller curve optimization methods for reducing the wear of the disc shears on the basis of the existing pinch roller structure roller curve.

[0009] The technical problem to be solved can be implemented through the following technical solutions.

[0010] A method for optimizing process parameters and roller profile curve of a pinch roller for reducing the wear of a disc shear, characterized in that it comprises the following steps:

[0011] A) Quantitative calculation of the wear of the circular scissor disc

[0012] According to the additional shear force generated by the disc shears due to the deviation of the strip, the wear amount of the disc shears under the action of the additional force is calculated;

[0013] B) Optimization of pinch roll process parameters

[0014] The wear of the disc scissors is taken as the objective function and the clamping force is taken as the variable to optimize the parameters.

[0015] Find out the clamping force of the pinch roller corresponding to the minimum wear of the cutter disc; judge whether the wear of the disc shear meets the normal service cycle range, if so, no roller profile curve optimization is required, if not, proceed to step C) to optimize the pinch roller profile curve;

[0016] C) Optimization of the pinch roll profile

[0017] The deviation of the strip under the action of the pinch roller is taken as the objective function, and the roller profile of the pinch roller is taken as the variable to optimize the roller profile parameters; find out the roller profile curve parameters when the deviation of the strip under the action of the pinch roller is minimized.

[0018] Further, step A) includes the following sub-steps:

[0019] A1) Calculate the deviation Δδ when the strip is sheared under the action of the deviation correction roller according to the following formula:

[0020]

[0021] Among them, L pp It is the deviation amount of the strip before entering the pinch roller;

[0022] P j is the clamping force of the pinch roller;

[0023] L j is the length of the pinch roller body;

[0024] b jp It is the deviation distance of the center line of the strip relative to the center line of the pinch roller;

[0025] t is the deviation time;

[0026] ρ is the strip density;

[0027] b is the strip width;

[0028] h is the strip thickness;

[0029] l is the length of the strip in the contact area between the strip and the pinch roller;

[0030] x is the coordinate of the strip deviation position;

[0031] A2) Calculate the correcting force F caused by the correcting function of the pinch roller as follows jp :

[0032]

[0033] A3) Calculate the wear amount of the cutter head according to the following formula δ yc :

[0034]

[0035] Among them, G st To obtain the wear resistance coefficient of the cutter disc;

[0036] μ is the friction coefficient between the circular scissor disc and the strip steel;

[0037] σ st is the strength of the cutter head;

[0038] λ is the cutter head strength conversion wear resistance coefficient.

[0039] Further, step B) comprises the following sub-steps:

[0040] B1) Taking the clamping force of the pinch roller as the variable, set the adjustment amount P according to the adjustment accuracy of the clamping force of the pinch roller device. d , set the adjustment step k of the clamping force p , set the initial clamping force P of the pinch roller j0 , so that the clamping force P of the pinch roller j =P j0 ;

[0041] B2) Calculate the objective function G(X) of the strip deviation Δδ and the wear of the circular scissor disc;

[0042] B3) Determine whether the strip deviation satisfies Δδ min ≤Δδ≤Δδ max ; If satisfied, record the wear amount of the cutter head G i (X), and let P j =P j +k p P d ; If not satisfied, the cutter head wear G will not be recorded i (X), and let P j =P j +k p P d ; G i (X) represents the i-th saved G(X);

[0043] B4) Determine whether the clamping force of the pinch roller meets P jmin ≤P j ≤P jmax If it is satisfied, return to step B2, if not, end the loop; find out the clamping force P of the pinch roller corresponding to the minimum wear of the cutter head j , set the clamping force of the pinch roller to P j ;

[0044] B5) Determine whether the wear amount of the disc shear meets the normal service cycle range. If so, there is no need to optimize the roller profile curve. If not, proceed to step C) to optimize the pinch roller profile curve.

[0045] Furthermore, in step B4), by using G(X)=min{G1(X), G2(X), ...G k (X)...G n (X)} to find the corresponding pinch roller clamping force P when the cutter head wear is the smallest j .

[0046] Furthermore, in step B1), the objective function G(X) of the wear amount of the circular scissors disc is calculated using the following formula:

[0047]

[0048] Further, in step C), the deviation amount of the strip under the action of the pinch roll is used as the objective function, and the roll shape of the pinch roll is used as the variable. When optimizing the roll shape parameters, the following formula is used for technology or comparison: wherein G(α) represents the deviation amount of the strip under the action of the pinch roll;

[0049]

[0050] Furthermore, step C) comprises the following sub-steps:

[0051] C1) Set the adjustment amount Δα according to the machining accuracy of the roller grinding machine, and set the adjustment step length k of the roller profile curve parameters α , set the initial roller profile parameters of the pinch roller to α=α0;

[0052] C2) Calculate the deviation of the strip Δδ;

[0053] C3) Determine whether the strip deviation satisfies Δδ min ≤Δδ≤Δδ max If satisfied, then record the current deviation G i (α), let α=α+k α Δα, if not satisfied, the current deviation G will not be recorded i (α), let α=α+k α Δα;

[0054] C4) Judge α min ≤α≤α max Is it true? If it is true, return to step C2. If not, end the loop and find out the roller curve parameter α when the strip deviation is minimized under the action of the pinch roller, and set the roller curve parameter to α.

[0055] Furthermore, in step C4), by using G(α)=min{G1(α), G2(α), ...G k (α)...G n (α)} to find out the roller curve parameter α when the strip deviation is minimized under the action of the pinch roll.

[0056] The method for optimizing the pinch roller process parameters and roller profile curve to reduce the wear of the disc shear by using the above technical solution has the following advantages and beneficial effects:

[0057] By optimizing the clamping force and roller profile of the pinch roller, the abnormal wear of the disc shear caused by strip deviation can be reduced, the service life of the disc shear can be improved, the stable operation time of the unit can be increased, and the production efficiency of the unit can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 The overall flow chart of the method for optimizing the process parameters of the pinch roller and the roller profile curve for reducing the wear of the disc shear according to the present invention;

[0059] Figure 2 Draw a flow chart for optimizing the pinch roll process parameters;

[0060] Figure 3 Flowchart for pinch roll profile optimization. DETAILED DESCRIPTION

[0061] The present invention comprehensively considers the characteristic parameters of the disc shears, the shearing process parameters, and the characteristics of the pinch roller device and process, with the goal of controlling the wear caused by the deviation of the disc shear, optimizing the process parameters and roller profile curve of the pinch roller, and on this basis, forming a set of pinch roller process parameter control methods and pinch roller roller profile curve structures to achieve abnormal wear of the disc shears caused by the deviation of the strip. The method for optimizing the pinch roller process parameters and roller profile curve for reducing the wear of the disc shear described in the present invention mainly includes three parts: quantitative calculation of abnormal wear of the cutter disc, optimization of pinch roller process parameters, and optimization method of pinch roller roller profile curve. In order to achieve the above purpose, the present invention adopts the following execution steps:

[0062] A) Quantitative calculation of the wear of the circular scissor disc

[0063] According to the additional shear force generated by the disc shears due to the deviation of the strip, the wear amount of the disc shears under the action of the additional force is calculated.

[0064] A1) Obtain the deviation L of the strip before it enters the pinch roller pp (mm), calculate the deviation Δδ (mm) when the strip is sheared under the action of the deviation correction roller. Obtain the clamping force P of the pinch roller j (N); Pinch roller body length L j (mm); the deviation distance b of the center line of the strip relative to the center line of the pinch roller jp (mm); deviation time t (s); strip density ρ (kg / mm 3 ); strip width b (mm); strip thickness h (mm); strip length l (mm) in the contact area between the strip and the pinch roller, and strip deviation position coordinate x.

[0065]

[0066] A2) Obtain the deviation Δδ, mm, when the strip is sheared under the action of the deviation correction roller; obtain the clamping force P of the pinch roller j , N; Pinch roller body length L j , mm; the deviation distance of the strip centerline relative to the pinch roller centerline b jp , mm, calculate the correcting force F generated by the pinch roller correcting function jp .

[0067]

[0068] A3) Obtain the wear resistance coefficient G of the cutter head st (g / mm 2 ); friction coefficient between the circular scissor disc and the strip steel μ; strength of the scissor disc σ st (MPa); the cutter head strength is converted to the wear resistance coefficient λ, and the wear amount δ of the cutter head is calculated yc .

[0069]

[0070] B) Optimization of pinch roll process parameters

[0071] By optimizing the pinch rollers, the pinch roller clamping force can improve the deviation of the strip during shearing, but too large a clamping force will increase the wear of the disc shear during shearing. The wear of the disc shear is taken as the objective function G(X), and the clamping force is taken as the variable to optimize the parameters:

[0072]

[0073] B1) Set the adjustment amount P according to the adjustment accuracy of the clamping force of the pinch roller device d , set the adjustment step k of the clamping force p , set the initial clamping force P of the pinch roller j0 , so that the clamping force P of the pinch roller j =P j0 ;

[0074] B2) Calculate the strip deviation Δδ and G(X);

[0075] B3) Determine whether the strip deviation satisfies Δδ min ≤Δδ≤Δδ max (The maximum and minimum deviation of the strip in the comparison formula are generally obtained from the equipment parameters of the unit, the minimum is generally 0, and the maximum depends on not exceeding the equipment frame); if it meets the requirements, the wear amount of the cutter head G is recorded i (X), and let P j =P j +k p P d ; If not satisfied, the cutter head wear G will not be recorded i (X), and let P j =P j +k p P d ; G i (X) represents the i-th saved G(X);

[0076] B4) Determine whether the clamping force of the pinch roller meets P j min ≤P j ≤P j max (The maximum and minimum clamping forces of the pinch roller device appearing here are determined according to the strip steel specifications). If satisfied, return to step B2; if not satisfied, end the loop; with the aid of G(X)=min{G1(X), G2(X), ...G k (X)...G n (X)}, find the corresponding P j , set the clamping force of the pinch roller to P jThat is, the formula is used to find the clamping force P of the pinch roller corresponding to the minimum wear of the cutter head. j Under the clamping force of the pinch roller, the wear of the cutter disc is minimal.

[0077] B5) Determine whether G(X)≤ε is established, that is, whether the wear amount of the disc shear meets the normal service cycle range. If so, there is no need to optimize the roller profile curve. If not, enter step C) to optimize the roller profile curve of the pinch roller.

[0078] C) The adjustment of the pinch roller parameters can no longer meet the requirements of the replacement cycle of the circular scissor disc. It is necessary to optimize the roller profile of the pinch roller to improve the deviation correction ability of the pinch roller. The deviation of the strip under the action of the pinch roller is taken as the objective function, and the roller profile of the pinch roller is taken as the variable to optimize the roller profile parameters. The specific calculation and comparison are as follows: Where G(α) represents the deviation of the strip under the action of the pinch roller;

[0079]

[0080] C1) Set the adjustment amount Δα according to the machining accuracy of the roller grinding machine, and set the adjustment step length k of the roller profile curve parameters α , set the initial roller parameter of the pinch roller to α=α0; among them, the step size is set to reduce the difficulty in the optimization process, and generally integers such as 1, 2, 3 are selected, and it can be set to 1 here.

[0081] C2) Calculate the deviation of the strip Δδ;

[0082] C3) Determine whether the strip deviation satisfies Δδ min ≤Δδ≤Δδ max If satisfied, then record the current deviation G i (α), let α=α+k α Δα, if not satisfied, the current deviation G will not be recorded i (α), let α=α+k α Δα;

[0083] C4) Judge α min ≤α≤α max Is it true (wherein the maximum and minimum values ​​of the roller profile parameters of the pinch roller appearing in the comparison formula are determined by the enterprise management standard), if it is satisfied, return to step C2), if not, end the loop, with the help of G(α)=min{G1(α), G2(α), ...G k (α)...G n (α)}, find out the corresponding α, and set the roller curve parameter to α; that is, find out the roller curve parameter when the strip deviation under the action of the pinch roller is minimized, and the corresponding cutter disc wear is also minimized.

[0084] The present invention is a method for optimizing the pinch roller process parameters and roller profile curve for reducing the wear of the disc shear, and its overall calculation flow chart is as follows: Figure 1 shown.

[0085] The following is a further detailed description of the application of the pinch roller process parameters and roller profile optimization method for reducing the shear wear of the disc described in the present invention in conjunction with the accompanying drawings and embodiments.

[0086] Embodiment 1:

[0087] A) Quantitative calculation of the wear of the circular scissors disc

[0088] According to the additional shear force generated by the disc shears due to the deviation of the strip, the wear amount of the disc shears under the action of the additional force is calculated.

[0089] A1) Get the strip deviation of 5mm, and calculate the deviation of 4.92mm when the strip is sheared under the action of the deviation correction roller. Get the clamping force of the pinch roller 20N; the roller length of the pinch roller 1500mm; the deviation time 1s; the strip density ρ, 7.85*10 -6 kg / mm 3 ; Strip width 1000mm; Strip thickness 0.3mm; Strip length in the contact area between the strip and the pinch roller 1.5mm.

[0090] A2) Obtain the deviation of the shear strip under the action of the deviation correction roller, which is 4.92 mm; obtain the clamping force of the pinch roller, which is 20 N; the length of the pinch roller is 1500 mm. Calculate the deviation correction force 2.8*10 -4 N.

[0091] A3) Obtain the wear resistance coefficient of the cutter head as 0.078g / mm 2 ; Friction coefficient between the circular scissor disc and the strip steel is 0.15; Cutter disc strength, 390MPa; Cutter disc strength converted to wear resistance coefficient is 0.1, and the calculated wear amount of the cutter disc is 8.4*10 -5 g / mm 2 .

[0092] B) Optimization of pinch roll process parameters

[0093] By optimizing the pinch roller, the clamping force of the pinch roller can improve the deviation of the strip during shearing, but too large a clamping force will increase the wear of the disc shear during shearing. The wear of the disc shear is taken as the objective function and the clamping force is taken as the variable to optimize the parameters.

[0094] B1) According to the adjustment accuracy of the clamping force of the pinch roller device, set the adjustment amount to 100N, set the adjustment step of the clamping force to 1, and set the initial clamping force P of the pinch roller. j =20N;

[0095] Steps B2-B5 are shown in Table 1. According to the optimization results, the clamping force of the pinch roller is set to P j =920N.

[0096] Table 1: B2-B5 optimization process results

[0097]

[0098]

[0099] Embodiment 2:

[0100] A) Quantitative calculation of the wear of the circular scissors disc

[0101] According to the additional shear force generated by the disc shears due to the deviation of the strip, the wear amount of the disc shears under the action of the additional force is calculated.

[0102] A1) Get the deviation of the strip steel 8mm, and calculate the deviation of the strip steel under the action of the deviation correction roller, which is 7.92mm. Get the clamping force of the pinch roller 20N; the roller length of the pinch roller 1500mm; the deviation time 1s; the strip steel density 7.85*10 -6 kg / mm 3 ; Strip width 1000mm; Strip thickness 0.3mm; Strip length in the contact area between the strip and the pinch roller 1.5mm.

[0103] A2) Obtain the deviation amount of the shear strip under the action of the deviation correction roller, which is 7.92 mm; obtain the clamping force of the pinch roller, which is 20 N; the roller length of the pinch roller is 1500 mm; calculate the deviation correction force 2.6*10 generated by the deviation correction function of the pinch roller -4 N.

[0104] A3) Obtain the wear resistance coefficient of the cutter head as 0.078g / mm 2 ; Friction coefficient between the circular scissor disc and the strip steel; Cutter disc strength, 390MPa; Cutter disc strength converted to wear resistance strength coefficient 0.1, calculated wear amount of the cutter disc 8.4*10 -5 g / mm 2 .

[0105] B) Optimization of pinch roll process parameters

[0106] By optimizing the pinch roller, the clamping force of the pinch roller can improve the deviation of the strip during shearing, but too large a clamping force will increase the wear of the disc shear during shearing. The wear of the disc shear is taken as the objective function and the clamping force is taken as the variable to optimize the parameters.

[0107] B1) According to the adjustment accuracy of the clamping force of the pinch roller device, set the adjustment amount to 100N, set the adjustment step of the clamping force to 1, and set the initial clamping force P of the pinch roller.j =20N;

[0108] As shown in Table 2, steps B2-B5 cannot meet the use range of the correction amount within the optimization range of the pinch roller clamping force, so step C is entered to optimize the roller profile curve of the pinch roller.

[0109] Table 2: B2-B5 optimization process results

[0110]

[0111] C) The adjustment of the pinch roller parameters can no longer meet the requirements of the replacement cycle of the disc scissor disc. It is necessary to optimize the roller shape of the pinch roller to improve the correction ability of the pinch roller. j =320N, the pinch roller deviation is taken as the objective function, and the pinch roller profile is taken as the variable to optimize the roller profile parameters.

[0112] C1) setting the adjustment amount to 0.5 according to the machining accuracy of the roller grinding machine, setting the adjustment step length of the roller profile curve parameter to 1, and setting the initial roller profile parameter of the pinch roller to α=1;

[0113] Steps C2-C4 are shown in Table 3. According to the optimization results, the clamping force of the pinch roller is set to α=3.

[0114] Table 3: C2-C4 optimization process results

[0115]

Claims

1. A method for optimizing the process parameters and roller profile of a pinch roller for reducing the wear of a disc shear, characterized in that: The steps include: A) Quantitative calculation of the wear of the circular scissor disc According to the additional shear force generated by the disc shears due to the deviation of the strip, the wear amount of the disc shears under the action of the additional force is calculated; B) Optimization of pinch roll process parameters The wear of the disc scissors is taken as the objective function and the clamping force is taken as the variable to optimize the parameters. Find out the clamping force of the pinch roller corresponding to the minimum wear of the cutter disc; judge whether the wear of the disc shear meets the normal service cycle range, if so, no roller profile curve optimization is required, if not, proceed to step C) to optimize the pinch roller profile curve; C) Optimization of the pinch roll profile The deviation of the strip under the action of the pinch roller is taken as the objective function, and the roller profile of the pinch roller is taken as the variable to optimize the roller profile parameters; find out the roller profile curve parameters when the deviation of the strip under the action of the pinch roller is minimized.

2. The method for optimizing the pinch roller process parameters and roller profile curve for reducing the shear wear of the disc according to claim 1, characterized in that: Step A) comprises the following sub-steps: A1) Calculate the deviation Δδ when the strip is sheared under the action of the deviation correction roller according to the following formula: Among them, L pp It is the deviation amount of the strip before entering the pinch roller; P j is the clamping force of the pinch roller; L j is the length of the pinch roller body; b jp It is the deviation distance of the center line of the strip relative to the center line of the pinch roller; t is the deviation time; ρ is the strip density; b is the strip width; h is the strip thickness; l is the length of the strip in the contact area between the strip and the pinch roller; x is the coordinate of the strip deviation position; A2) Calculate the correcting force F caused by the correcting function of the pinch roller as follows jp : A3) Calculate the wear amount of the cutter head according to the following formula δ yc : Among them, G st To obtain the wear resistance coefficient of the cutter disc; μ is the friction coefficient between the circular scissor disc and the strip steel; σ st is the strength of the cutter head; λ is the cutter head strength conversion wear resistance coefficient.

3. The method for optimizing the pinch roller process parameters and roller profile curve for reducing the shear wear of the disc according to claim 2, characterized in that: Step B) comprises the following sub-steps: B1) Taking the clamping force of the pinch roller as the variable, set the adjustment amount P according to the adjustment accuracy of the clamping force of the pinch roller device. d , set the adjustment step k of the clamping force p , set the initial clamping force P of the pinch roller j0 , let the clamping force P of the pinch roller j =P j0 ; B2) Calculate the objective function G(X) of the strip deviation Δδ and the wear of the circular scissor disc; B3) Determine whether the strip deviation satisfies Δδ min ≤Δδ≤Δδ max ; If satisfied, record the wear amount of the cutter head G i (X), and let P j =P j +k p P d ; If not satisfied, the cutter wear G will not be recorded i (X), and let P j =P j +k p P d ; G i (X) represents the i-th saved G(X); B4) Determine whether the clamping force of the pinch roller meets P jmin ≤P j ≤P jmax If it is satisfied, return to step B2, if not, end the loop; find out the clamping force P of the pinch roller corresponding to the minimum wear of the cutter head j , set the clamping force of the pinch roller to P j ; B5) Determine whether the wear amount of the disc shear meets the normal service cycle range. If so, there is no need to optimize the roller profile curve. If not, proceed to step C) to optimize the pinch roller profile curve.

4. The method for optimizing the pinch roller process parameters and roller profile curve for reducing the shear wear of the disc according to claim 3, characterized in that: In step B4), by means of G(X)=min{G1(X), G2(X), ...G k (X)...G n (X)} to find the corresponding pinch roller clamping force P when the cutter head wear is the smallest j .

5. The method for optimizing the pinch roller process parameters and roller profile curve for reducing the wear of the disc shear according to claim 3, characterized in that: In step B1), the objective function G(X) of the wear amount of the circular scissors disc is calculated using the following formula:

6. The method for optimizing the pinch roller process parameters and roller profile curve for reducing the wear of the disc shear according to claim 2, characterized in that: In step C), the deviation amount of the strip under the action of the pinch roller is used as the objective function, and the roller profile of the pinch roller is used as the variable. When optimizing the roller profile parameters, the following formula is used for technical or comparison: wherein G(α) represents the deviation amount of the strip under the action of the pinch roller; 7. The method for optimizing the pinch roller process parameters and roller profile curve for reducing the wear of the disc shear according to claim 6, characterized in that: Step C) comprises the following sub-steps: C1) Set the adjustment amount Δα according to the machining accuracy of the roller grinding machine, and set the adjustment step length k of the roller profile curve parameters α , set the initial roller profile parameters of the pinch roller to α=α0; C2) Calculate the deviation of the strip steel Δδ; C3) Determine whether the strip deviation satisfies Δδ min ≤Δδ≤Δδ max If satisfied, then record the current deviation G i (α), let α=α+k α Δα, if not satisfied, the current deviation G will not be recorded i (α), let α=α+k α Δα; C4) Judge α min ≤α≤α max Is it true? If it is true, return to step C2. If not, end the loop and find out the roller curve parameter α when the strip deviation is minimized under the action of the pinch roller, and set the roller curve parameter to α.

8. The method for optimizing the pinch roller process parameters and roller profile curve for reducing the wear of the disc shear according to claim 6, characterized in that: In step C4), by means of G(α)=min{G1(α), G2(α), ...G k (α)...G n (α)} to find out the roller curve parameter α when the strip deviation is minimized under the action of the pinch roll.

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