A hot strip steel pinch roll, pinch roll mechanism and roll shape design method

Abstract

The application provides a hot-rolled strip steel pinch roll, a pinch roll mechanism and a roll shape design method. The pinch roll roll shape is symmetrically arranged left and right, and the roll body includes a strip steel main action area, an edge modification area and an end area. The strip steel main action area is located in the middle of the roll body and adopts a six-order curve shape. The edge modification area is located on both sides of the strip steel main action area, and the modification area adopts a quadratic trinomial curve shape. The end area is arranged outside the edge modification area and adopts a straight line shape. The different curves are smoothly connected in a tangent manner. The roll shape design method includes three steps of constructing a roll body curve, simulating the axial distribution force distribution of the pinch roll by using a finite element model, and adjusting the curve according to the simulation result. Through the separate design of the three-section shape of the roll body, it is ensured that the pinch roll is uniformly worn during service, and after wear, the pinch roll still has good roll shape retention, ensuring that the pinch roll has high pinch efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rolling mill equipment, in particular to a hot-rolled strip steel pinch roll, pinch roll mechanism and roll shape design method. BACKGROUND

[0002] After the hot-rolled strip steel is rolled by the finishing mill and enters the coiler, it needs to pass through the pinch roll to pre-bend the head of the strip steel. The pinch roll has two functions. Firstly, after pre-bending, the strip steel is easy to be coiled by the coiler. Secondly, the pinch roll tightens the strip steel so that the strip steel maintains a certain tension before entering the coiler.

[0003] However, in order to prevent the strip steel from slipping and sawtooth winding or tower winding during the pre-bending process of the pinch roll, the pressure between the pinch roll and the strip steel often needs to be increased, thereby aggravating the wear of the pinch roll and shortening the service life of the pinch roll. At the same time, due to the uneven wear of the edge modification area and the middle part, the roll shape changes, greatly reducing the efficiency of the pinch roll.

[0004] A composite roll-shaped pinch roll disclosed in Chinese patent CN 202061927 U adopts a flat roll in the middle of the roll body and multiple times of curve lines on both sides of the roll body, which improves the wear degree of the pinch roll and prolongs the service life. Since the pinch roll has multiple times of curve lines on both sides, the contact form between the roll body of the pinch roll and the strip steel is improved, and the pressure distribution along the length of the roll body of the pinch roll is more uniform, thereby reducing the wear degree of the pinch roll and prolonging the service life. However, it is found in actual use that the edge part and the middle part of the pinch roll are prone to uneven wear, and the roll shape changes after use, resulting in poor pinch effect of the pinch roll. SUMMARY

[0005] To solve the above problems in the prior art, the purpose of the present application is to provide a hot-rolled strip steel pinch roll with uniform wear, a pinch roll mechanism and a roll shape design method.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows:

[0007] A hot-rolled strip steel pinch roll, wherein the pinch roll is symmetrically arranged left and right, the roll body of the pinch roll comprises a strip steel main action area, an edge modification area and an end area; the strip steel main action area is located in the middle of the roll body and adopts a six-time curve shape; the edge modification area is located on both sides of the strip steel main action area, and the modification area adopts a quadratic trinomial curve shape; the end area is arranged outside the edge modification area and adopts a straight line shape; different curves are smoothly connected in a tangent manner.

[0008] Further improvement of the present application is that: the center point of the longitudinal cutting surface of the pinch roll is taken as the origin, the left-right symmetry axis of the roll body is taken as the y-axis, and the horizontal tangent of the origin is taken as the x-axis to establish a horizontal coordinate system; the roll shape curves on the left and right sides of the y-axis are symmetrically arranged, and the roll shape curve on the right side of the y-axis comprises:

[0009] The main action area of the strip steel: y(x) = a 0 +a 2 x 2 +a 4 x 4 +a 6 x 6 0 < x < x c

[0010] The edge shaping area: y(x) = m 0 +m 1 x + m 2 x 2 x c < x < x q

[0011] The end area: y ( x ) = C x q < x ≤ x max

[0012] In the formula,

[0013] a 0、 a 2、 a 4、 a 6、m0、m1、m2 are polynomial coefficients, a 0∈(-1,1), a 2∈(-1×10 -3 ,1×10 -3 ), a 4∈(-1×10 -6 ,1×10 -6 ), a 6 ∈(-1×10 -9 ,1×10 -9 ), m0 ∈(-1,1), m 1 ∈(-0.1,0.1), m 2 ∈(-0.01,0.01); and a 0 、a 2 、a 4 、a 6 are not simultaneously 0, m 0 、m 1 、m 2 are not simultaneously 0; x c is the edge coordinate of the main action area of the strip steel, and has a value of x c = B max / 2- L 1, in mm;

[0014] x q is the edge coordinate of the edge correction area, and has a value of x q = B max / 2, in mm;

[0015] x max is half of the length of the pinch roll, in mm;

[0016] B max is the maximum width of the pinchable strip steel, in mm;

[0017] L 1 is the length of the edge correction area, in mm;

[0018] C is a constant, and has a value range of: y(x q )＜C＜ 0.2, y(x q ) is the edge point of the edge correction area x q corresponding to the value of y .

[0019] The further improvement of the present application is that the length of the edge correction area L 1 is 25mm~100mm, and the height h0 2 μm ~5 μm .

[0020] A hot-rolled strip pinch roll mechanism, the pinch roll mechanism including an upper pinch roll and a lower pinch roll arranged correspondingly, the upper pinch roll and the lower pinch roll having the same roll profile curve.

[0021] A method for designing the shape of pinch rolls for hot-rolled strip steel includes the following steps:

[0022] S1. Construct the roller body curve

[0023] Collect the pinch wear data of the pinch roller and construct the roller profile grinding curve of the pinch roller;

[0024] S2. Simulation of axial force distribution on the pinch rollers using a finite element model.

[0025] Based on the roll profile curve provided in step 1, and using parameters such as the roll diameter, roll length, strip width, and strip thickness of the pinch roll, a finite element model is used for parametric simulation to determine the axial force distribution of the pinch roll. p(x) Perform simulation calculations;

[0026] S3. Adjust the curve based on the simulation results.

[0027] Calculate axial distributed force p(x) The difference between the maximum and minimum values ​​Δ p， With judgment coefficient δ Compare; if Δp≤ δ If the set conditions are met, the curve design is completed; if Δp > δ Adjust and optimize the pinch roll profile curve, and re-perform the simulation calculation in step S2 until the requirements are met. Δp ≤ δ Complete the curve design.

[0028] Specifically, step S1 includes the following process:

[0029] S11. The main working zone of the strip in the middle of the pinch roll body adopts a sixth-order curve, and the curve form is as follows:

[0030] y(x) = a 0 +a 2 x 2 +a 4 x 4 +a 6 x 6 0 < x < xc

[0031] In the formula, a 0、 a 2. a 4. a 6 represents the polynomial coefficients. a 0∈(-1,1), a 2∈(-1×10 -3 1×10 -3 ), a 4∈(-1×10 -6 1×10 -6 ), a 6 ∈(-1×10 -9 1×10 -9 ),and a 0 、a 2 、a 4 、a 6 Not both are 0;

[0032] x c The edge coordinates of the main working zone of the strip are given by the following values. x c = B max / 2- L 1;

[0033] B max The maximum width of the strip that can be clamped and fed, in mm;

[0034] L 1 represents the length of the edge trimming area, in mm;

[0035] S12. The edge shaping area adopts a quadratic trinomial shaping curve, and the curve form is as follows:

[0036] y(x) = m 0 +m 1 x + m 2 x 2 x c < x < x q

[0037] In the formula, m 0 , m 1 ,m 2 are polynomial coefficients, m 0 ∈(-1,1), m 1 ∈(-0.1,0.1), m 2 ∈(-0.01,0.01), and m 0 、m 1 、m 2 are not all zero at the same time;

[0038] x q are edge coordinates of the edge portion practice area, and take values in the range of x q = B max / 2, in units of mm;

[0039] S13, the end portion area adopts a straight line, as follows:

[0040] y ( x ) = C x q < x ≤ x max

[0041] In the formula, C is a constant, and its value range is: y(x q )＜C＜ 0.2,

[0042] x max is half of the pinch roll length, in units of mm.

[0043] In the step 2, the calculation method of the axial distribution force of the pinch roll is:

[0044]

[0045] In the formula: b 1, b 2, b 3 are polynomial coefficients, generated by curve fitting of simulation results.

[0046] In the step 3, the value of the judgment coefficient δ is determined by the method:

[0047]

[0048] In the formula, pFor clamping force, B The width of the strip is in mm.

[0049] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0050] This invention provides a pinch roll and pinch roll mechanism for hot-rolled strip steel. The roll body adopts a segmented curved shape. The main working area of ​​the strip steel in the middle of the roll body adopts a high-order curve, and the pinching force can be adjusted according to the size of the sixth-order curve convexity. The edge shaping area adopts a quadratic trinomial curve, which opens the two sides of the pinch roll wear box, resulting in more uniform wear, reducing roll wear, and extending its service life. The end area adopts a straight line design, which increases the grinding efficiency of the grinding machine on the roll. The above roll shape helps to maintain uniform force on all parts of the pinch roll, ensuring uniform wear during service. Even after wear, the pinch roll still has good roll shape retention, ensuring high pinching efficiency.

[0051] This invention also provides a method for designing the shape of pinch rolls for hot-rolled strip. Through reasonable data acquisition and finite element model simulation of the axial force distribution of the pinch rolls, the roll shape curve of the pinch rolls is accurately obtained. In practice, compared to flat, straight-shaped pinch rolls, the pinch rolls of this invention reduce the probability of strip waviness after pinching, decrease the coiling defects caused by strip misalignment during the coiling process due to high edge tension, and reduce the coiling defect rate by 5% to 10%. Furthermore, while balancing pinching efficiency and uniform wear, the service life and operating time of the pinch rolls are significantly extended. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the structure of the present invention;

[0053] Figure 2 for Figure 1 A magnified schematic diagram of part A in the middle section;

[0054] Figure 3 A schematic diagram of constructing a rectangular coordinate system;

[0055] Figure 4 A flowchart illustrating the method for designing the shape of the pinch roller;

[0056] Figure 5 A schematic diagram of the roller profile design for the pinch roller;

[0057] Figure 6 A schematic diagram showing the wear shape of the roller and the straight pinch roller designed for this invention;

[0058] To clearly demonstrate the roller structure, Figure 1 , Figure 2 The dimensions shown are not the actual dimensions.

[0059] In the diagram, 1 is the upper pinch roll, 2 is the lower pinch roll, 3 is the main working area of ​​the strip, 4 is the edge shaping area, and 5 is the end area. Detailed Implementation

[0060] The present invention will now be described in detail with reference to the accompanying drawings.

[0061] A type of hot-rolled strip steel pinch roll, such as Figure 1 As shown, the pinch rolls are symmetrically arranged on the left and right sides. The pinch roll body includes a main strip working area, an edge shaping area, and an end area. The main strip working area is located in the middle of the roll body and adopts a hexagonal curve shape. The edge shaping area is located on both sides of the main strip working area and adopts a quadratic trinomial curve shape. The end area is located outside the edge shaping area and adopts a straight line shape. The different curves are smoothly transitioned by tangency.

[0062] like Figure 3 , Figure 4 As shown, a horizontal coordinate system is established with the center point of the upper edge of the longitudinal section of the pinch roll as the origin, the left and right axes of symmetry of the roll body as the y-axis, and the horizontal tangent at the origin as the x-axis; the distance between the origin and the center line of the roll shaft is 1 / 2 of the roll diameter. The roll profile curves on the left and right sides of the y-axis are symmetrically arranged, and the roll profile curve on the right side of the y-axis includes:

[0063] Main working area of ​​strip steel: y(x) = a 0 +a 2 x 2 +a 4 x 4 +a 6 x 6 0 < x < x c

[0064] Edge shaping area: y(x) = m 0 +m 1 x + m 2 x 2 x c < x < x q

[0065] End region: y ( x ) = C x q < x ≤x max

[0066] In the formula,

[0067] a 0 、a 2 、a 4 、a 6 、m 0 、m 1 、m 2 All are polynomial coefficients. a 0∈(-1,1), a 2∈(-1×10 -3 1×10 -3 ), a 4∈(-1×10 -6 1×10 -6 ), a 6 ∈(-1×10 -9 1×10 -9 ), m 0 ∈(-1,1), m 1 ∈(-0.1,0.1), m 2 ∈(-0.01,0.01); and a 0 、a 2 、a 4 、a 6 Not both equal to 0, m 0 、m 1 、m 2 Not both are 0;

[0068] x c The edge coordinates of the main working zone of the strip are given by the following values. x c = B max / 2- L 1. The unit is mm;

[0069] x q The edge coordinates of the border training area, with values ​​of... xq = B max / 2, unit: mm;

[0070] x max is half of the length of the pinch roll, unit: mm;

[0071] B max is the maximum width of the pinchable strip steel, unit: mm;

[0072] L 1 is the length of the edge shaping area, unit: mm;

[0073] C is a constant, and its value range is: y(x q )＜C＜ 0.2, y(x q ) is the edge point of the edge shaping area x q corresponding y value.

[0074] Generally, the length of the edge shaping area L 1 is 25mm~100mm, and the height h 0 is 2 μm ~5 μm .

[0075] A hot-rolled strip steel pinch roll mechanism, comprising a corresponding upper pinch roll and lower pinch roll, the roll shape curves of the upper pinch roll and the lower pinch roll are the same. The roll shape parameters of the upper pinch roll and the lower pinch roll, and the gap distance between the upper pinch roll and the lower pinch roll are adjusted according to the thickness of the strip steel and other limiting conditions; generally, the roll lengths of the upper pinch roll and the lower pinch roll are the same, and the roll diameters can be the same or different, as long as they do not affect the effective pinch of the strip steel.

[0076] A hot-rolled strip steel pinch roll shape design method, comprising the following steps:

[0077] S1, constructing a roll body curve

[0078] Collecting pinch wear data of the pinch roll, and constructing a pinch roll shape grinding curve;

[0079] S11, the middle part of the pinch roll body is the main action area of the strip steel, and a sixth curve is adopted, and the design shape determines the pinch force of the pinch roll; the curve form is as follows:

[0080] y(x) = a 0 +a 2x 2 +a 4 x 4 +a 6 x 6 0 < x < x c

[0081] wherein, a 0、 a 2、 a 4、 a 6 are polynomial coefficients, a 0∈(-1,1), a 2∈(-1×10 -3 ,1×10 -3 ), a 4∈(-1×10 -6 ,1×10 -6 ), a 6 ∈(-1×10 -9 ,1×10 -9 ), and a 0 、a 2 、a 4 、a 6 are not simultaneously 0;

[0082] x c is the edge coordinate of the main action area of the strip steel, and the value is x c = B max / 2- L 1; B max is the maximum width of the strip steel that can be clamped, in mm; L 1 is the length of the edge modification area, in mm;

[0083] S12, the edge modification area adopts a quadratic three-term polynomial modification curve, the edge of the roll body is more uniform in contact with the strip steel, so that the pinch roll wear box opens on both sides; the curve form is as follows:

[0084] y(x) = m 0 +m 1 x + m 2 x 2 xc < x < x q

[0085] In the formula, m0, m1, m2 are polynomial coefficients, m 0 ∈(-1,1), m 1 ∈(-0.1,0.1), m 2 ∈(-0.01,0.01), and m 0 、m 1 、m 2 are not simultaneously 0;

[0086] x q is the edge coordinate of the edge portion practice area, and the value is x q = B max / 2, unit: mm;

[0087] S13, the end portion area adopts a straight line to increase the grinding efficiency of the grinding machine on the roller, as follows:

[0088] y ( x ) = C x q < x ≤ x max

[0089] In the formula, C is a constant, and the value range is: y(x q )＜C＜ 0.2;

[0090] x max is half of the length of the pinch roll, unit: mm.

[0091] S2, the finite element model is used to simulate the axial distribution force distribution of the pinch roll

[0092] According to the roll shape curve provided in step 1, based on the roll diameter, roll length, and parameters such as strip width and strip thickness of the pinch roll, the finite element model is used for parameter simulation, and the axial distribution force p(x) of the pinch roll is simulated and calculated;

[0093] The calculation method of the axial distribution force p(x) of the pinch roll is:

[0094]

[0095] wherein: b 1、 b 2、 b 3 are polynomial coefficients, whose values are directly generated by simulation result curve fitting.

[0096] S3, curve adjustment according to simulation result

[0097] Calculate the difference Δ between the maximum and minimum of the axial distribution force p(x) p， And the judgment coefficient δ Compare; if Δp ≤ δ , the setting condition is met to complete the curve design; if Δp > δ , adjust and optimize the pinch roll profile curve and re-perform the simulation calculation of step S2 until Δp ≤ δ , the curve design is completed.

[0098] The value of the judgment coefficient δ is obtained by the method:

[0099]

[0100] wherein, p is the pinch force, B is the strip width, in mm.

[0101] In the above formula, the pinch force p is related to the strip width, strip material, gap width between the upper and lower pinch rolls, etc. When the above influencing factors are determined, the pinch force p is a certain value, which can be obtained by pressure sensor acquisition. Example 1

[0102] In this embodiment, the hot-rolled strip is Q235B plain carbon steel with a width of 1020 mm and a thickness of 3.0 mm; the pinch roll mechanism includes an upper pinch roll and a lower pinch roll, the roll diameter of the upper pinch roll is 900 mm and the roll length is 1250 mm, the roll diameter of the lower pinch roll is 500 mm and the roll length is 1250 mm, the pinch force collected by the pressure sensor installed on the pinch roll of this specification production line is about 50 KN.

[0103] The roll shape of the pinch roll is designed based on the above quantitative parameters.

[0104] A hot-rolled strip pinch roll shape design method, comprising the following steps:

[0105] S1, constructing a roll body curve

[0106] ​Collect the pinch roll wear data, build the pinch roll shape grinding curve curve;

[0107] S11, the pinch roll body middle part is the main action area of the strip, adopts six curve, the design shape determines the pinch force of the pinch roll; The curve form is as follows:

[0108] y(x) = 2.88160708E-07 x 2 - 6.69217649E-13 x 4 + 2.45398305E-19 x 6 0 < x < x c

[0109] That is, the coefficient a 0 The value is 0, the coefficient a 2 The value is 2.88160708E-07, the coefficient a 4 The value is-6.69217649E-13, the coefficient a 6 The value is 2.45398305E-19.

[0110] The pinchable strip width B max The value is 1020mm, the length of the edge modification area L 1The value is 100mm, so the edge coordinate of the strip main action area x c = B max / 2- L 1=1020 / 2-100=410mm. That is, the value range of x In the curve of the strip main action area is: 0≤ x ≤410.

[0111] S12, the edge modification area adopts quadratic three term modification curve, the edge of the roll body is more uniform with the strip, so that the pinch roll wear box opens on both sides; The curve form is as follows:

[0112] y(x) = -3.86196477E-07 x 2 + 3.89257982E-04 x - 6.40080090E-02 x c < x < x q

[0113] In the formula, the coefficient m0 takes the value -6.40080090E-02 , m1 takes the value 3.89257982E-04 , m2 takes the value - 3.86196477E-07 .

[0114] Edge coordinates of the edge portion x q = 510 mm, i.e. the value range of the edge portion curve is: 410 < x < 510. B max / 2 = 1020 / 2 = 510 mm, i.e. the value range of the edge portion curve is: 410 < x < 510. x x

[0115] S13, the end portion curve adopts a straight line to increase the grinding efficiency of the grinding machine, as follows:

[0116] y x = 0.034048 x q x x max

[0117] X max = 625 mm, i.e. the value range of the end portion curve is: 510 < x < 625. x x

[0118] S2, the finite element model is used to simulate the axial distribution force distribution of the pinch roll

[0119] According to the roll shape curve provided in step 1, the working finite element simulation model of the pinch roll is established according to the following sizes:

[0120] The axial distribution force of the pinch roll is simulated and calculated, and the simulation result fitting curve is p(x)

[0121]

[0122] S3, the curve is adjusted according to the simulation result

[0123] After the simulation of the pinch process by the finite element, the roll force distribution curve is extracted and fitted to obtain the curve p(x) , and the difference between the maximum and minimum values is calculated Δp 0.009538 KN / mm, which is less than the set value 0.01 KN / mm, which meets the condition, and the roll shape curve design is completed.

[0124] Therefore, the roll shape curve designed based on the pinch roll parameters in the embodiment includes:

[0125] The main action area of the strip steel:

[0126] y(x) = 2.88160708E-07 x 2 ​​​​​​​​- 6.69217649E-13 x 4 + 2.45398305E-19 x 6

[0127] x is in the range of 0 < x < 410;

[0128] Edge shaping area:

[0129] y(x) = -3.86196477E-07 x 2 + 3.89257982E-04 x - 6.40080090E-02

[0130] x is in the range of 410 < x < 510;

[0131] End region:

[0132] y ( x = 0.034048 x is in the range of 510 < x < 625.

[0133] After comparison, the newly designed roller shape significantly improves the uniformity of the wear pattern of the pinch roller. The wear pattern of the roller shape designed in this invention is similar to that of a straight pinch roller. Figure 5 As shown, the wear pattern is significantly more uniform; at the same time, the clamping efficiency is significantly improved, and the rate of poor winding due to insufficient clamping force, such as loose winding, decreases by 5%.

[0134] The service life of ordinary flat pinch rolls is usually 20 days, with a steel throughput of 200,000 tons; the service life of the pinch rolls of this invention can reach 25 days, with a steel throughput of 250,000 tons; the steel throughput is increased by 25%.

[0135] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should be included in the scope of the present invention.

Claims

1. A hot strip steel pinch roll characterized by: The pinch roll roll shape is left-right symmetrical, the pinch roll roll body includes a strip steel main action area, an edge modification area and an end area; the strip steel main action area is located in the middle of the roll body and adopts a six-time curve shape; the edge modification area is located on both sides of the strip steel main action area and adopts a quadratic three-term curve shape; the end area is located outside the edge modification area and adopts a straight line shape; different curves are smoothly connected by tangency; A horizontal coordinate system is established with the center point of the pinch roll longitudinal section roll surface as the origin, the left-right symmetry axis of the roll body as the y axis and the horizontal tangent of the origin as the x axis; the roll shape curves on the left and right sides of the y axis are symmetrically arranged, and the roll shape curve on the right side of the y axis includes: Strip steel main action area: y(x)=a 0 +a 2 x 2 +a 4 x 4 +a 6 x 6 0≤x≤x c Edge modification zone: y(x)=m 0 +m 1 x+m 2 x 2 x c <x≤x q End region: y x Cx q x x max ​​​​ In the formula, a 0 、a 2 、a 4 、a 6 、m 0 、m 1 、m 2 are all polynomial coefficients, a 0∈(-1,1), a 2∈(-1×10 -3 ,1×10 -3 ), a 4∈(-1×10 -6 ,1×10 -6 ), a 6 ∈(-1×10 -9 ,1×10 -9 ), m 0 ∈(-1,1), m 1 ∈(-0.1,0.1), m 2 ∈(-0.01,0.01); and a 0 、a 2 、a 4 、a 6 are not simultaneously zero, m 0 、m 1 、m 2 are not simultaneously zero; x c is the edge coordinate of the main acting zone of the strip steel, which is x c = B max / 2- L 1, in mm; x q For the edge coordinates of the edge part practice area, the value is x q = B max / 2, unit: mm; x max Half the pinch roll length in mm. B max Wmaxis the maximum width of the strip that can be pinched, in mm; L 1 is the length of the edge modification zone in mm; C is a constant, which has a value in the range of: y(x q )＜C＜ 0.2, y(x q ) is an edge point of the edge modification region x q corresponding y value.

2. A hot strip steel pinch roll as defined in claim 1 wherein: The length of the edge modification zone L 1 is 25 mm to 100 mm, height h 0 is 2 μm ~5 μm .

3. A mechanism comprising a hot strip pilger mill according to any one of claims 1 to 2, characterized in that The pinch roll includes a corresponding upper pinch roll and a lower pinch roll, and the roll shape curves of the upper pinch roll and the lower pinch roll are the same.

4. The roll shape design method for a hot strip steel pinch roll according to any one of claims 1 to 2, characterized in that The method includes the following steps: S1, constructing a roll body curve Collecting pinch roll pinch wear data, constructing a pinch roll roll shape grinding curve; S2, simulating the axial distribution force distribution of the pinch roll by using a finite element model According to the roll-shaped grinding curve provided in step S1, based on the roll diameter, roll length of the pinch roll, and the strip steel width, strip steel thickness parameters, parameter simulation is carried out by using a finite element model to obtain the axial distribution force of the pinch roll p(x) Simulation calculation is carried out; S3, adjusting the curve according to the simulation result Computing the axial distribution of forces p(x) The difference between the maximum and minimum values Δp, And the judging coefficient δ Are compared; If Δp ≤ δ , the setting condition is reached, and the curve design is completed; if Δp>δ , the pinch roll curve is adjusted and optimized, and the simulation calculation of step S2 is performed again until Δp ≤ δ , the curve design is completed.

5. The method of roll shape design of a hot strip steel pinch roll according to claim 4, wherein The step S1 specifically includes the following processes: S11, the strip steel main action area in the middle of the pinch roll roll body adopts a six-time curve, and the curve form is as follows: y(x)=a 0 +a 2 x 2 +a 4 x 4 +a 6 x 6 0≤x≤x c wherein a 0 、a 2 、a 4 、a 6 are polynomial coefficients, a 0∈(-1,1), a 2∈(-1×10 -3 ,1×10 -3 ), a 4∈(-1×10 -6 ,1×10 -6 ), a 6 ∈(-1×10 -9 ,1×10 -9 ), and a 0 、a 2 、a 4 、a 6 are not simultaneously zero. x c is the edge coordinate of the main acting zone of the strip steel, which is valued as x c = B max / 2- L 1; B max Wmax is the maximum width of the strip that can be pinched, in mm; L 1 is the length of the edge modification zone in mm; S12, the edge modification area adopts a quadratic three-term modification curve, and the curve form is as follows: y(x)=m 0 +m 1 x+m 2 x 2 x c <x≤x q wherein m 0 、m 1 、m 2 are not simultaneously zero; and m 0 ∈(-1,1), m 1 ∈(-0.1,0.1), m 2 ∈(-0.01,0.01), and m 0 、 m 1 、m 2 are not simultaneously zero; and x q For the edge coordinates of the edge part practice area, the value is x q = B max / 2, unit: mm; S13, the end area adopts a straight line, as follows: y ( x ) = Cx q ＜ x ≤ x max In the formula, C is a constant, and its value range is: y(x q )＜C＜ 0.2, x max Half the length of the pinch roll, in mm.

6. The method of roll shape design of a hot strip steel pinch roll according to claim 4, characterized in that: In the step S2, the calculation method of the axial distribution force of the pinch roll is as follows: ； In the formula: b 1、 b 2、 b 3 is a polynomial coefficient, generated from simulation results curve fitting.

7. The method of roll shape design of a hot strip steel pinch roll according to claim 4, characterized in that: In the step S3, the value of the coefficient δ is determined by the method: ； wherein p is the pinch force, B is the strip width in mm.

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