Rolling method for precisely controlling the speed of a roughing mill train

Abstract

The present application belongs to the field of hot continuous rolling, and relates to a rolling method for precisely controlling the speed of a rough rolling mill set, which is suitable for a 1450mm hot continuous rolling production line. The rolling method for precisely controlling the speed of the rough rolling mill set comprises the following steps: determining the type of a steel to be rolled; calculating the flat roll rolling speed of each pass in rough rolling work according to the type of the steel; calculating the flat roll steel biting speed of each pass in rough rolling work according to the type of the steel; calculating the roller table rolling speed and the roller table steel biting speed between the flat roll and the vertical roll according to the type of the steel, the flat roll rolling speed and the flat roll steel biting speed of each pass; and calculating the vertical roll rolling speed and the vertical roll steel biting speed according to the type of the steel, the flat roll rolling speed and the flat roll steel biting speed of each pass.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of hot continuous rolling, and relates to a rolling method for precisely controlling the speed of a rough rolling mill. BACKGROUND

[0002] The main production process of a 1450mm hot continuous rolling production line is as follows: a slab is firstly heated in a heating furnace according to a process specified temperature, and after being heated to a target temperature, the slab is firstly rolled in a rough rolling mill, wherein the rough rolling mill controls the width by a vertical roll and controls the thickness by a horizontal roll. The rough rolling mill performs reversible rolling, generally for 5-7 passes, and at least for 1 pass and at most for 7 passes. In the first, third, fifth and seventh odd passes, the width is controlled by the vertical roll, and after the head of the strip exits the vertical roll, the thickness is controlled by the horizontal roll. During the combined rolling of the horizontal roll and the vertical roll, the exit speed of the vertical roll is the entry speed of the horizontal roll. After the tail of the strip exits the vertical roll, the part between the horizontal roll and the vertical roll is rolled only by the horizontal roll to complete the pass. In the second, fourth and sixth even passes, only the horizontal roll is used for rolling, and the vertical roll is opened to be not controlled.

[0003] After the rolling of the rough rolling mill, the strip reaches the pre-set target thickness, width and temperature. Then, the strip is rolled in a seven-stand horizontal roll continuous rolling mill to reach the pre-set target thickness and temperature. Finally, the strip is formed into a coil by a coiler.

[0004] The rough rolling equipment mainly includes three parts of descaling, vertical roll and horizontal roll, and roll tables are arranged before the vertical roll, between the vertical roll and the horizontal roll and after the horizontal roll. The present application mainly studies the speeds of the vertical roll, the horizontal roll and the roll table between the vertical roll and the horizontal roll, and the speeds of the remaining parts are still controlled according to the original control method. The rough rolling speed is controlled based on the horizontal roll, and is divided into two parts of biting speed and rolling speed, i.e. the strip is bitten at a low biting speed and then the speed is increased to the rolling speed for rolling. The precise control of the rough rolling speed has a great influence on production, quality and efficiency. If the speed is too fast, it is easy to cause production faults such as slipping and scratching, and surface quality problems. If the speed is too slow, it has a great influence on production efficiency. The following problems exist in actual production:

[0005] The rolling speed is not precise, which does not match the actual production site. Some steel grades frequently slip, such as cold rolling materials, some steel grades are severely scratched, such as 400 series stainless steel, but some steel grades neither slip nor have scratching defects, and the speed is too slow, which affects the production efficiency.

[0006] The biting speed does not match the rolling speed. When the biting speed does not match the rolling speed, the faults such as biting scrap and speed slippage occur. Through long-term research and test, the biting speed and the strip temperature, the roll diameter and the reduction of each pass are related on the basis of the determined rolling speed of each pass, but the existing technology does not consider the influence of the above factors.

[0007] The speed of the vertical roll, the speed of the roll table between the vertical roll and the horizontal roll and the speed of the horizontal roll do not match. The existing technology is to first calculate the biting speed and the rolling speed of the horizontal roll, and then the biting speed and the rolling speed of the vertical roll and the roll table between the vertical roll and the horizontal roll are obtained by multiplying the biting speed and the rolling speed of the horizontal roll and the front slip (odd pass) or the rear slip (even pass) of the horizontal roll, that is, the speed of the vertical roll and the roll table is the same as the inlet speed (odd pass) or the outlet speed (even pass) of the horizontal roll. However, in the actual rolling process, the front slip or the rear slip is affected by many noise factors, and the phenomenon of waist collapse or sleeve is easily generated between the vertical roll and the roll table, between the roll table and the horizontal roll and between the vertical roll and the horizontal roll, and under this condition, the scratch defect is easily generated. SUMMARY

[0008] In order to overcome the defects in the above related technology, the present application provides a rolling method for accurately controlling the speed of a rough rolling mill set. The rolling method for accurately controlling the speed of the rough rolling mill set is suitable for a 1450mm hot continuous rolling production line. The rolling method for accurately controlling the speed of the rough rolling mill set comprises:

[0009] determining the type of the steel to be rolled;

[0010] calculating the horizontal roll rolling speed of each pass in the rough rolling work according to the type of the steel;

[0011] calculating the horizontal roll biting speed of each pass in the rough rolling work according to the type of the steel;

[0012] calculating the roll table rolling speed and the roll table biting speed between the vertical roll and the horizontal roll according to the type of the steel, the horizontal roll rolling speed and the horizontal roll biting speed of each pass;

[0013] calculating the vertical roll rolling speed and the vertical roll biting speed according to the type of the steel, the horizontal roll rolling speed and the horizontal roll biting speed of each pass.

[0014] The rolling method for accurately controlling the speed of the rough rolling mill set further comprises: correcting the horizontal roll rolling speed, the horizontal roll biting speed, the roll table rolling speed, the roll table biting speed, the vertical roll rolling speed and the vertical roll biting speed according to the rolling direction of each pass;

[0015] The correction formula is:

[0016] v(i) e =(-1) i-1v(i)

[0017] v0(i) e = (-1) i-1 v0(i)

[0018] v_roll(i) e = (-1) i-1 v_roll(i)

[0019] v0_roll(i) e = (-1) i-1 v0_roll(i)

[0020] v_E(i) e = (-1) i-1 v_E(i)

[0021] v0_E(i) e = (-1) i-1 v0_E(i)

[0022] In the formula, i represents the current pass number in each pass, taking 1-7, the odd pass is positive rolling, and the even pass is reverse rolling;

[0023] v(i) e , v0(i) e , v_roll(i) e , v0_roll(i) e , v_E(i) e , v0_E(i) e respectively represent the corrected current pass flat roller rolling speed, flat roller biting speed, roller rolling speed, roller biting speed, vertical roller rolling speed, vertical roller biting speed

[0024] speed value;

[0025] v(i), v0(i), v_roll(i), v0_roll(i), v_E(i), v0_E(i) respectively represent the current pass flat roller rolling speed, flat roller biting speed, roller rolling speed, roller biting speed, vertical roller rolling speed, vertical roller biting speed calculation absolute value.

[0026] The method for calculating the flat roller rolling speed of each pass in the rough rolling work according to the steel type includes:

[0027] Specifically calculated according to the following formula:

[0028] v(i) = kvv0 + i*kvv1 / (passno + coff) + add_coff

[0029] In the formula, i represents the current pass number, taking 1-7;

[0030] v(i) represents the rolling speed of the i-th pass;

[0031] kvv0 represents a constant term, and takes a value of 2.2;

[0032] kvv1 represents a pass coefficient, and takes a value of 2.5;

[0033] passno represents the total number of rolling passes, and takes a value of 5 for a total of 5 passes, and takes a value of 7 for a total of 7 passes;

[0034] coff is a pass coefficient, mainly for speed compensation calculation of some steel grades in 7 passes, and is related to the pass, the steel grade, the thickness, and the width, and is specifically taken from Table 1;

[0035] add_coff is an additional coefficient, and is related to the pass number, the steel grade, and the pass, and is specifically taken from Table 2;

[0036] Table 1: Pass coefficient coff value table

[0037]

[0038] Table 2: Additional coefficient add_coff value table

[0039]

[0040]

[0041] The method for calculating the flat roll bite speed of each pass in rough rolling according to the steel grade type comprises:

[0042] v0(i) = v(i) * (0.85 - 0.0005 * en_temp(i) * sqrt(d / 2 * red(i) / (d / 2 - red(i) / 2))

[0043] In the formula, i represents the current pass number, and takes a value of 1-7;

[0044] v0(i) represents the flat roll bite speed of the i-th pass, and the unit is m / s;

[0045] v(i) represents the flat roll rolling speed of the i-th pass, and the unit is m / s;

[0046] en_temp(i) represents the inlet temperature of the i-th pass, which refers to the calculated average temperature of the surface and center of the inlet strip, and the unit is ℃;

[0047] red(i) represents the reduction of the i-th pass, and the unit is mm;

[0048] d represents the working roll diameter, and the unit is mm.

[0049] The method for calculating the roll gap speed and the roll bite speed between the flat roll and the roll gap comprises:

[0050] The odd pass roll gap speed and the roll bite speed are as follows:

[0051] v_roll(i)=v(i)*bslip(i)*(1-corr_roll)

[0052] v0_roll(i)=v0(i)*bslip(i)*(1-corr_roll)

[0053] wherein i represents the current pass number, taking 1-7;

[0054] v_roll(i) and v0_roll(i) represent the i-th pass roll gap speed and the roll bite speed, respectively, with the unit of m / s;

[0055] v(i) and v0(i) represent the i-th pass flat roll speed and the flat roll bite speed, with the unit of m / s;

[0056] bslip(i) represents the i-th pass flat roll back slip coefficient;

[0057] corr_roll represents the roll gap correction coefficient, which is related to the steel grade; the specific value is shown in Table 3;

[0058] Table 3 Value table of roll gap correction coefficient corr_roll

[0059] steel grade corr_roll ultra pure stainless steel 0.03 400 series stainless steel 0.02 high temperature grain oriented silicon steel 0.03 high permeability grain oriented silicon steel 0.035 carbon steel cold rolled material 0.025 other 0.01

[0060] The even pass roll gap speed and the roll bite speed are as follows:

[0061] v_roll(i)=v(i)*fslip(i)*(1+corr_roll*0.6)

[0062] v0_roll(i)=v0(i)*fslip(i)*(1+corr_roll*0.6)

[0063] wherein i represents the current pass number, taking 1-7;

[0064] v_roll(i) and v0_roll(i) represent the i-th pass roll gap speed and the roll bite speed, respectively, with the unit of m / s;

[0065] v(i) and v0(i) represent the i-th pass flat roll speed and the flat roll bite speed, with the unit of m / s;

[0066] fslip(i) represents the i-th pass flat roll front slip coefficient;

[0067] corr_roll represents the roll table correction coefficient, which is related to the steel grade; the specific value is taken from Table 3.

[0068] The method for calculating the vertical roll rolling speed and the vertical roll biting speed comprises:

[0069] The odd pass vertical roll rolling speed and the vertical roll biting speed are calculated as follows:

[0070] v_E(i) = v(i) * bslip(i) * (1 - corr_roll) * (1 - corr_E)

[0071] v0_E(i) = v0(i) * bslip(i) * (1 - corr_roll) * (1 - corr_E)

[0072] In the formula, i represents the current pass number, taking 1-7;

[0073] v_E(i) and v0_E(i) represent the vertical roll rolling speed and the vertical roll biting speed of the ith pass, respectively, with the unit of m / s;

[0074] v(i) and v0(i) represent the flat roll rolling speed and the flat roll biting speed of the ith pass, with the unit of m / s;

[0075] bslip(i) represents the flat roll post-slip coefficient of the ith pass;

[0076] corr_roll represents the roll table correction coefficient, which is related to the steel grade; the specific value is taken from Table 3.

[0077] corr_E represents the vertical roll correction coefficient, which is related to the steel grade; the specific value is shown in Table 4;

[0078] Table 4 Value Table of Vertical Roll Correction Coefficient corr_E

[0079] steel grade corr_E ultra pure stainless steel 0.024 400 series stainless steel 0.016 high temperature grain oriented silicon steel 0.024 high permeability grain oriented silicon steel 0.028 carbon steel cold rolled material 0.02 other 0.008

[0080] The even pass vertical roll rolling speed and the vertical roll biting speed are calculated as follows:

[0081] v_E(i) = v(i) * fslip(i) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0082] v0_E(i) = v0(i) * fslip(i) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0083] In the formula, i represents the current pass number, taking 1-7;

[0084] v_E(i), v0_E(i) represent the i-th pass vertical roll rolling speed, vertical roll biting speed, unit: m / s;

[0085] v(i), v0(i) represent the i-th pass flat roll rolling speed, flat roll biting speed, unit: m / s;

[0086] fslip(i) represents the i-th pass flat roll front slip coefficient;

[0087] corr_roll represents the roll correction coefficient, which is related to the steel grade; and is specifically taken from Table 3;

[0088] corr_E represents the vertical roll correction coefficient, which is related to the steel grade; and is specifically taken from Table 4.

[0089] The beneficial effects of the present application are:

[0090] Compared with the prior art, after the implementation of the present patent technology, the slipping phenomenon and scratch defects existing in various steel grades are effectively eliminated, the process requirements of various steel grades are met, and on this basis, the rolling efficiency is maximized. After the present patent technology is put into practical application, the waste product amount is reduced by 1789 tons / month, the rolling efficiency is improved by 1.01%, and the economic benefits are obvious. BRIEF DESCRIPTION OF DRAWINGS

[0091] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0092] fig. 1 The figure of the hot continuous rolling equipment described in the present application. DETAILED DESCRIPTION

[0093] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0094] In the description of the present application, it needs to be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0095] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0096] As fig. 1 illustrated, the present application is further illustrated by way of examples below, but the present application is not limited to the scope of the examples described. The experimental methods not specified in the following examples are carried out according to conventional methods and conditions.

[0097] Example 1:

[0098] This example rolls ordinary carbon steel, steel grade: Q235A; steel coil number: 94A053501, billet thickness 230mm, billet width 1260mm; rough rolling target thickness 42mm, target temperature 1080℃; finished product thickness 4.65mm, finished product width target 1250mm.

[0099] The rough rolling is carried out in 7 passes, and the speed of each part of the rough rolling is calculated as follows:

[0100] 1. Calculate the flat rolling speed of each pass

[0101] According to Table 1 and Table 2, the pass coefficient coff and the additional coefficient add_coff of each pass are as follows:

[0102]

[0103] According to formula (1), the flat rolling speed of each pass is calculated as follows:

[0104] v(1) = kvv0 + 1*kvv1 / (passno + coff) + add_coff = 2.2 + 1*2.5 / (7 -1.5) + 0 = 2.65 (m / s)

[0105] v(2) = kvv0 + 2*kvv1 / (passno + coff) + add_coff = 2.2 + 2*2.5 / (7 -1.5) + 0 = 3.11 (m / s)

[0106] v(3) = kvv0 + 3*kvv1 / (passno + coff) + add_coff = 2.2 + 3*2.5 / (7 -1.0) + 0 = 3.45 (m / s)

[0107] v(4) = kvv0 + 4*kvv1 / (passno + coff) + add_coff = 2.2 + 4*2.5 / (7 -1.0) + 0 = 3.87 (m / s)

[0108] v(5) = kvv0 + 5*kvv1 / (passno + coff) + add_coff = 2.2 + 5*2.5 / (7 -1.0) + 0 = 4.28 (m / s)

[0109] v(6) = kvv0 + 6*kvv1 / (passno + coff) + add_coff = 2.2 + 6*2.5 / (7 -0.6) + 0 = 4.54 (m / s)

[0110] v(7) = kvv0 + 7*kvv1 / (passno + coff) + add_coff = 2.2 + 7*2.5 / (7 -0) + 0 = 4.7 (m / s)

[0111] 2. Calculate the flat roll biting speed of each pass

[0112] The rough rolling work roll diameter: 1135.08 mm;

[0113] The rolling speed, entry temperature and reduction of each pass are calculated as follows:

[0114]

[0115] According to formula (2)

[0116] v0(1) = v(1)*(0.85 - 0.0005*en_temp(1)*sqrt(d / 2*red(1) / (d / 2-red(1) / 2))

[0117] = 2.65*(0.85 - 0.0005*1186*sqrt(1135.08 / 2*23.4) / (1135.08 / 2-23.4 / 2))

[0118] = 1.93 (m / s)

[0119] v0(2) = v(2) * (0.85 - 0.0005 * en_temp(2) * sqrt(d / 2 * red(2) / (d / 2 - red(2) / 2))

[0120] = 3.11 * (0.85 - 0.0005 * 1181 * sqrt(1135.08 / 2 * 37.0) / (1135.08 / 2 - 37.0 / 2))

[0121] = 2.16 (m / s)

[0122] v0(3) = v(3) * (0.85 - 0.0005 * en_temp(3) * sqrt(d / 2 * red(3) / (d / 2 - red(3) / 2))

[0123] = 3.45 * (0.85 - 0.0005 * 1176 * sqrt(1135.08 / 2 * 30.2) / (1135.08 / 2 - 30.2 / 2))

[0124] = 2.45 (m / s)

[0125] v0(4) = v(4) * (0.85 - 0.0005 * en_temp(4) * sqrt(d / 2 * red(4) / (d / 2 - red(4) / 2))

[0126] = 3.87 * (0.85 - 0.0005 * 1168 * sqrt(1135.08 / 2 * 33.6) / (1135.08 / 2 - 33.6 / 2))

[0127] = 2.72 (m / s)

[0128] v0(5) = v(5) * (0.85 - 0.0005 * en_temp(5) * sqrt(d / 2 * red(5) / (d / 2 - red(5) / 2))

[0129] = 4.28 * (0.85 - 0.0005 * 1160 * sqrt(1135.08 / 2 * 26.8) / (1135.08 / 2 - 26.8 / 2))

[0130] = 3.09 (m / s)

[0131] v0(6) = v(6) * (0.85 - 0.0005 * en_temp(1) * sqrt(d / 2 * red(1) / (d / 2 - red(1) / 2))

[0132] = 4.54 * (0.85 - 0.0005 * 1141 * sqrt(1135.08 / 2 * 23.6 / (1135.08 / 2 - 23.6 / 2))

[0133] = 3.32 (m / s)

[0134] v0(7) = v(7) * (0.85 - 0.0005 * en_temp(7) * sqrt(d / 2 * red(7) / (d / 2 - red(7) / 2))

[0135] = 4.7 * (0.85 - 0.0005 * 1133 * sqrt(1135.08 / 2 * 16.9 / (1135.08 / 2 - 16.9 / 2))

[0136] = 3.53 (m / s)

[0137] 3. Calculate the roll speed and bite speed of the roll table between the flat roll and the vertical roll

[0138] The front slip and back slip values of each pass flat roll are as follows:

[0139]

[0140]

[0141] (1) Calculate the roll speed of the odd pass

[0142] According to Table 3, the roll correction coefficient corr_roll is 0.01, according to formula (3), formula (4), the roll speed and bite speed of each pass are calculated as follows:

[0143] v_roll(1) = v(1) * bslip(1) * (1 - corr_roll) = 2.65 * 0.916 * (1 - 0.01) = 2.40 (m / s)

[0144] v0_roll(1) = v0(1) * bslip(1) * (1 - corr_roll) = 1.93 * 0.916 * (1 - 0.01) = 1.75 (m / s)

[0145] v_roll(3) = v(3) * bslip(3) * (1 - corr_roll) = 3.45 * 0.852 * (1 - 0.01) = 2.91 (m / s)

[0146] v0_roll(3) = v0(3) * bslip(3) * (1 - corr_roll) = 2.62 * 0.852 * (1 - 0.01) = 2.23 (m / s)

[0147] v0_roll(3) = v0(3) * bslip(3) * (1 - corr_roll) = 2.45 * 0.852 * (1 - 0.01) = 2.07 (m / s)

[0148] v_roll(5) = v(5) * bslip(5) * (1 - corr_roll) = 4.28 * 0.792 * (1 - 0.01) = 3.36 (m / s)

[0149] v0_roll(5) = v0(5) * bslip(5) * (1 - corr_roll) = 3.09 * 0.792 * (1 - 0.01) = 2.42 (m / s)

[0150] v_roll(7) = v(7) * bslip(7) * (1 - corr_roll) = 4.7 * 0.762 * (1 - 0.01) = 2.40 (m / s)

[0151] v0_roll(7) = v0(7) * bslip(7) * (1 - corr_roll) = 3.53 * 0.762 * (1 - 0.01) = 2.66 (m / s)

[0152] (2) Even pass roll speed calculation

[0153] According to formula (5), formula (6), each pass roll speed, bite speed calculation is as follows:

[0154] v_roll(2) = v(2) * fslip(2) * (1 + corr_roll * 0.6) = 3.11 * 1.031 * (1 + 0.01 * 0.6) = 3.23 (m / s)

[0155] v0_roll(2) = v0(2) * fslip(2) * (1 + corr_roll * 0.6) = 2.16 * 1.031 * (1 + 0.01 * 0.6) = 2.24 (m / s)

[0156] v_roll(4) = v(4) * fslip(4) * (1 + corr_roll * 0.6) = 3.87 * 1.045 * (1 + 0.01 * 0.6) = 4.07 (m / s)

[0157] v0_roll(4) = v0(4) * fslip(4) * (1 + corr_roll * 0.6) = 2.72 * 1.045 * (1 + 0.01 * 0.6) = 2.86 (m / s)

[0158] v_roll(6) = v(6) * fslip(6) * (1 + corr_roll * 0.6) = 4.54 * 1.059 * (1 + 0.01 * 0.6) = 4.84 (m / s)

[0159] v0_roll(6) = v0(6) * fslip(6) * (1 + corr_roll * 0.6) = 3.32 * 1.059 * (1 + 0.01 * 0.6) = 3.54 (m / s)

[0160] 4. Calculate the speed of vertical roll rolling, bite speed

[0161] (1) Calculate the speed of odd pass vertical roll

[0162] According to Table 4, the vertical roll correction coefficient corr_E is 0.008, according to formula (7), formula (8), the speed of odd pass vertical roll rolling and bite speed is calculated as follows:

[0163]

[0164] v_E(1) = v(1) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0165] = 2.65 * 0.916 * (1 - 0.01) * (1 - 0.008) = 2.38 (ms / )

[0166] v0_E(1) = v0(1) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0167] = 1.93 * 0.916 * (1 - 0.01) * (1 - 0.008) = 1.73 (ms / )

[0168] v_E(3) = v(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0169] = 3.45 * 0.852 * (1 - 0.01) * (1 - 0.008) = 2.89 (ms / )

[0170] v0_E(3) = v0(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0171] = 2.45 * 0.852 * (1 - 0.01) * (1 - 0.008) = 2.05 (ms / )

[0172] v_E(5) = v(5) * bslip(5) * (1 - corr_roll) * (1 - corr_E)​

[0173] = 4.28 * 0.792 * (1 - 0.01) * (1 - 0.008) = 3.33 (ms / )

[0174] v0_E(5) = v0(5) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0175] = 3.09 * 0.792 * (1 - 0.01) * (1 - 0.008) = 2.40 (ms / )

[0176] v_E(7) = v(7) * bslip(7) * (1 - corr_roll) * (1 - corr_E)

[0177] = 4.7 * 0.762 * (1 - 0.01) * (1 - 0.008) = 3.52 (ms / )

[0178] v0_E(7) = v0(7) * bslip(7) * (1 - corr_roll) * (1 - corr_E)

[0179] = 3.53 * 0.762 * (1 - 0.01) * (1 - 0.008) = 2.64 (ms / )

[0180] (2) Even pass stand roll speed calculation

[0181] According to formula (9), formula (10), the even pass each pass stand roll rolling speed, bite steel speed is calculated as follows:

[0182] v_E(2) = v(2) * fslip(2) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0183] = 3.11 * 1.031 * (1 + 0.01 * 0.6) * (1 + 0.008 * 0.7) = 3.24 (ms / )

[0184] v0_E(2) = v0(2) * fslip(2) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0185] = 2.16 * 1.031 * (1 + 0.01 * 0.6) * (1 + 0.008 * 0.7) = 2.25 (ms / )

[0186] v_E(4) = v(4) * fslip(4) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0187] == 3.87*1.045*(1+0.01*0.6)*(1+0.008*0.7) = 4.09 (ms / )

[0188] v0_E(4) = v0(4)*fslip(4)*(1+corr_roll*0.6)*(1+corr_E*0.7)

[0189] = 2.72*1.045*(1+0.01*0.6)*(1+0.008*0.7) = 2.88 (ms / )

[0190] v_E(6) = v(6)*fslip(6)*(1+corr_roll*0.6)*(1+corr_E*0.7)

[0191] = 4.54*1.059*(1+0.01*0.6)*(1+0.008*0.7) = 4.86 (ms / )

[0192] v0_E(6) = v0(6)*fslip(6)*(1+corr_roll*0.6)*(1+corr_E*0.7)

[0193] = 3.32*1.059*(1+0.01*0.6)*(1+0.008*0.7) = 3.56 (ms / )

[0194] 5. Determine the speed direction, correct the forward and reverse pass speed

[0195] According to formula (11) to formula (16), the speed direction is determined, and the forward and reverse pass speed is corrected. After correction, all the speeds of the 1st, 3rd, 5th and 7th passes are positive, and the 2nd and 4th passes are negative.

[0196] The final calculated values of the flat roll rolling speed, flat roll biting speed, roller table rolling speed, roller table biting speed, vertical roll rolling speed, vertical roll biting speed and the parameters are as follows:

[0197]

[0198]

[0199] The above-mentioned accurately calculated speeds are controlled, the strip rolling is stable, there is no slipping phenomenon, and no surface defects such as scratches.

[0200] Example 2:

[0201] This example rolls high-strength steel, steel grade: TQ700MCD; steel coil number: 94B074601, billet thickness 230mm, billet width 1030mm; rough rolling target thickness 40mm, target temperature 1080°C; finished product thickness 4.0mm, finished product width target 1000mm.

[0202] The rough rolling uses 7 passes, and the rough rolling part speed is calculated as follows:

[0203] 1. Calculate the flat rolling speed of each pass

[0204] According to Table 1 and Table 2, the pass coefficient coff and the additional coefficient add_coff of each pass are as follows:

[0205]

[0206] According to formula (1), the flat rolling speed of each pass is calculated as follows:

[0207] v(1) = kvv0 + 1 * kvv1 / (passno + coff) + add_coff = 2.2 + 1 * 2.5 / (7 + 2.0) + 0 = 2.48 (m / s)

[0208] v(2) = kvv0 + 2 * kvv1 / (passno + coff) + add_coff = 2.2 + 2 * 2.5 / (7 + 2.0) + 0 = 2.76 (m / s)

[0209] v(3) = kvv0 + 3 * kvv1 / (passno + coff) + add_coff = 2.2 + 3 * 2.5 / (7 + 2.0) + 0 = 3.03 (m / s)

[0210] v(4) = kvv0 + 4 * kvv1 / (passno + coff) + add_coff = 2.2 + 4 * 2.5 / (7 + 2.0) + 0 = 3.31 (m / s)

[0211] v(5) = kvv0 + 5 * kvv1 / (passno + coff) + add_coff = 2.2 + 5 * 2.5 / (7 + 2.0) + 0 = 3.59 (m / s)

[0212] v(6) = kvv0 + 6 * kvv1 / (passno + coff) + add_coff = 2.2 + 6 * 2.5 / (7 + 2.0) + 0 = 3.87 (m / s)

[0213] v(7) = k * v0 + 7 * k * vv1 / (passno + coff) + add_coff = 2.2 + 7 * 2.5 / (7 + 2.0) + 0 = 4.14 (m / s)2. Calculate the flat roll biting speed of each pass

[0214] The roughing work roll diameter: 1129.9 mm;

[0215] The rolling speed, entry temperature and reduction of each pass are calculated as follows:

[0216]

[0217] According to formula (2)

[0218] v0(1) = v(1) * (0.85 - 0.0005 * en_temp(1) * sqrt(d / 2 * red(1) / (d / 2 - red(1) / 2))

[0219] = 2.48 * (0.85 - 0.0005 * 1227 * sqrt(1129.9 / 2 * 41) / (1129.9 / 2 - 41 / 2))

[0220] = 1.68 (m / s)

[0221] v0(2) = v(2) * (0.85 - 0.0005 * en_temp(2) * sqrt(d / 2 * red(2) / (d / 2 - red(2) / 2))

[0222] = 2.76 * (0.85 - 0.0005 * 1218.6 * sqrt(1129.9 / 2 * 37.1) / (1129.9 / 2 - 37.1 / 2))

[0223] = 1.90 (m / s)

[0224] v0(3) = v(3) * (0.85 - 0.0005 * en_temp(3) * sqrt(d / 2 * red(3) / (d / 2 - red(3) / 2))

[0225] = 3.03 * (0.85 - 0.0005 * 1213.4 * sqrt(1129.9 / 2 * 33) / (1129.9 / 2 - 33 / 2))

[0226] = 2.12 (m / s)

[0227] v0(4) = v(4) * (0.85 - 0.0005 * en_temp(4) * sqrt(d / 2 * red(4) / (d / 2 - red(4) / 2))

[0228] = 3.31 * (0.85 - 0.0005 * 1198.3 * sqrt(1129.9 / 2*26.4) / (1129.9 / 2-26.4 / 2))

[0229] = 2.38 (m / s)

[0230] v0(5) = v(5) * (0.85 - 0.0005 * en_temp(5) * sqrt(d / 2*red(5) / (d / 2-red(5) / 2))

[0231] = 3.59 * (0.85 - 0.0005 * 1190.2 * sqrt(1129.9 / 2*25.6) / (1129.9 / 2-25.6 / 2))

[0232] = 2.59 (m / s)

[0233] v0(6) = v(6) * (0.85 - 0.0005 * en_temp(1) * sqrt(d / 2*red(1) / (d / 2-red(1) / 2))

[0234] = 3.87 * (0.85 - 0.0005 * 1153.6 * sqrt(1129.9 / 2*16.4) / (1129.9 / 2-16.4 / 2))

[0235] = 2.90 (m / s)

[0236] v0(7) = v(7) * (0.85 - 0.0005 * en_temp(7) * sqrt(d / 2*red(7) / (d / 2-red(7) / 2))

[0237] = 4.14 * (0.85 - 0.0005 * 1135.6 * sqrt(1129.9 / 2*14.8) / (1129.9 / 2-14.8 / 2))

[0238] = 3.14 (m / s)

[0239] 3. Calculate the speed of the roller and the speed of the roller

[0240] The front slip and back slip values of each pass are as follows:

[0241]

[0242] (1) Calculate the speed of the roller

[0243] According to Table 3, the roll correction coefficient corr_roll takes the value 0.01, according to formula (3), formula (4), the roll speed of each pass is calculated as follows

[0244] The roll speed and bite speed are calculated as follows:

[0245] v_roll(1) = v(1) * bslip(1) * (1 - corr_roll) = 2.48 * 0.85 * (1 - 0.01) = 2.09 (m / s)

[0246] v0_roll(1) = v0(1) * bslip(1) * (1 - corr_roll) = 1.68 * 0.85 * (1 - 0.01) = 1.41 (m / s)

[0247] v_roll(3) = v(3) * bslip(3) * (1 - corr_roll) = 3.03 * 0.821 * (1 - 0.01) = 2.47 (m / s)

[0248] v0_roll(3) = v0(3) * bslip(3) * (1 - corr_roll) = 2.12 * 0.821 * (1 - 0.01) = 1.72 (m / s)

[0249] v_roll(5) = v(5) * bslip(5) * (1 - corr_roll) = 3.59 * 0.778 * (1 - 0.01) = 2.76 (m / s)

[0250] v0_roll(5) = v0(5) * bslip(5) * (1 - corr_roll) = 2.59 * 0.778 * (1 - 0.01) = 1.99 (m / s)

[0251] v_roll(7) = v(7) * bslip(7) * (1 - corr_roll) = 4.14 * 0.777 * (1 - 0.01) = 2.40 (m / s)

[0252] v0_roll(7) = v0(7) * bslip(7) * (1 - corr_roll) = 3.14 * 0.777 * (1 - 0.01) = 2.66 (m / s)

[0253] (2) Even pass roll speed calculation

[0254] According to formula (5), formula (6), the roll speed and bite speed of each pass are calculated as follows:

[0255] v_roll(2) = v(2)*fslip(2)*(1 + corr_roll*0.6) = 2.76*1.034*(1 + 0.01*0.6) = 2.87(m / s)

[0256] v0_roll(2) = v0(2)*fslip(2)*(1 + corr_roll*0.6) = 1.90*1.034*(1 + 0.01*0.6) = 1.97(m / s)

[0257] v_roll(4) = v(4)*fslip(4)*(1 + corr_roll*0.6) = 3.31*1.042*(1 + 0.01*0.6) = 3.47(m / s)

[0258] v0_roll(4) = v0(4)*fslip(4)*(1 + corr_roll*0.6) = 2.38*1.042*(1 + 0.01*0.6) = 2.49(m / s)

[0259] v_roll(6) = v(6)*fslip(6)*(1 + corr_roll*0.6) = 3.87*1.049*(1 + 0.01*0.6) = 4.08(m / s)

[0260] v0_roll(6) = v0(6)*fslip(6)*(1 + corr_roll*0.6) = 2.90*1.049*(1 + 0.01*0.6) = 3.06(m / s)

[0261] 4. Calculate the speed of vertical roll rolling, bite speed

[0262] (1) Calculate the speed of odd pass vertical roll

[0263] According to table 4, the vertical roll correction coefficient corr_E is 0.008, according to formula (7), formula (8), the speed of odd pass vertical roll rolling and bite speed is calculated as follows:

[0264]

[0265] v_E(1) = v(1)*bslip(1)*(1-corr_roll)*(1-corr_E)

[0266] = 2.48*0.85*(1-0.01)*(1-0.008) = 2.07(ms / )

[0267] v0_E(1) = v0(1)*bslip(1)*(1-corr_roll)*(1-corr_E) ​

[0268] = 1.68 * 0.85 * (1 - 0.01) * (1 - 0.008) = 1.40 (ms / )

[0269] v_E(3) = v(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0270] = 3.03 * 0.821 * (1 - 0.01) * (1 - 0.008) = 2.45 (ms / )

[0271] v0_E(3) = v0(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0272] = 2.12 * 0.821 * (1 - 0.01) * (1 - 0.008) = 1.71 (ms / )

[0273] v_E(5) = v(5) * bslip(5) * (1 - corr_roll) * (1 - corr_E)

[0274] = 3.59 * 0.778 * (1 - 0.01) * (1 - 0.008) = 2.74 (ms / )

[0275] v0_E(5) = v0(5) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0276] = 2.59 * 0.778 * (1 - 0.01) * (1 - 0.008) = 1.98 (ms / )

[0277] v_E(7) = v(7) * bslip(7) * (1 - corr_roll) * (1 - corr_E)

[0278] = 4.14 * 0.777 * (1 - 0.01) * (1 - 0.008) = 3.16 (ms / )

[0279] v0_E(7) = v0(7) * bslip(7) * (1 - corr_roll) * (1 - corr_E)

[0280] = 3.14 * 0.777 * (1 - 0.01) * (1 - 0.008) = 2.39 (ms / )

[0281] (2) Even pass stand roll speed calculation

[0282] According to formula (9), formula (10), the even pass each pass stand rolling speed, bite steel speed is calculated as follows:

[0283] v_E(2) = v(2)*fslip(2)*(1 + corr_roll*0.6)*(1 + corr_E*0.7)

[0284] = 2.76*1.034*(1 + 0.01*0.6)*(1 + 0.008*0.7) = 2.88 (ms / )

[0285] v0_E(2) = v0(2)*fslip(2)*(1 + corr_roll*0.6)*(1 + corr_E*0.7)

[0286] = 1.90*1.034*(1 + 0.01*0.6)*(1 + 0.008*0.7) = 1.98 (ms / )

[0287] v_E(4) = v(4)*fslip(4)*(1 + corr_roll*0.6)*(1 + corr_E*0.7)

[0288] = = 3.31*1.042*(1 + 0.01*0.6)*(1 + 0.008*0.7) = 3.49 (ms / )

[0289] v0_E(4) = v0(4)*fslip(4)*(1 + corr_roll*0.6)*(1 + corr_E*0.7)

[0290] = 2.38*1.042*(1 + 0.01*0.6)*(1 + 0.008*0.7) = 2.50 (ms / )

[0291] v_E(6) = v(6)*fslip(6)*(1 + corr_roll*0.6)*(1 + corr_E*0.7)

[0292] = 3.87*1.049*(1 + 0.01*0.6)*(1 + 0.008*0.7) = 4.10 (ms / )

[0293] v0_E(6) = v0(6)*fslip(6)*(1 + corr_roll*0.6)*(1 + corr_E*0.7)

[0294] = 2.90*1.049*(1 + 0.01*0.6)*(1 + 0.008*0.7) = 3.08 (ms / )

[0295] 5. Determine the direction of the speed, correct the forward and reverse pass speed

[0296] According to the formula (11) to formula (16), the speed direction is determined, and the forward and reverse pass speeds are corrected. After correction, all the speeds of the 1st, 3rd, 5th and 7th passes are positive, and the speeds of the 2nd and 4th passes are negative.

[0297] The final calculated values of the flat roll rolling speed, the flat roll biting speed, the roll table rolling speed, the roll table biting speed, the vertical roll rolling speed, the vertical roll biting speed and the parameters are as follows:

[0298]

[0299] The above-mentioned accurately calculated speeds are controlled, the strip rolling is stable, there is no slip phenomenon, and there is no surface defect such as scratch.

[0300] Example 3:

[0301] In this example, high-temperature oriented silicon steel is rolled, the steel grade is DQ01, the coil number is 94B518901, the billet thickness is 222 mm, the billet width is 1081 mm, the rough rolling target thickness is 47 mm, the target temperature is 1110℃, the finished product thickness is 2.5 mm, and the finished product width target is 1055 mm.

[0302] The rough rolling adopts 5 passes, and the speed of each part of the rough rolling is calculated as follows:

[0303] 1. Calculate the flat roll rolling speed of each pass

[0304] According to Table 1 and Table 2, the pass coefficient coff and the additional coefficient add_coff of each pass are as follows:

[0305]

[0306] According to the formula (1), the flat roll rolling speed of each pass is calculated as follows:

[0307] v(1) = kvv0 + 1 * kvv1 / (passno + coff) + add_coff = 2.2 + 1 * 2.5 / (5 + 0.0) + 0.0 = 2.70 (m / s)

[0308] v(2) = kvv0 + 2 * kvv1 / (passno + coff) + add_coff = 2.2 + 2 * 2.5 / (5 + 0.0) + 0.8 = 4.00 (m / s)

[0309] v(3) = kvv0 + 3 * kvv1 / (passno + coff) + add_coff = 2.2 + 3 * 2.5 / (5 + 0.0) + 0.8 = 4.50 (m / s)

[0310] v(4) = kvv0 + 4*kvv1 / (passno + coff) + add_coff = 2.2 + 4*2.5 / (5 + 0.0) + 0.5 = 4.70 (m / s)

[0311] v(5) = kvv0 + 5*kvv1 / (passno + coff) + add_coff = 2.2 + 5*2.5 / (5 + 0.0) + 0.2 = 4.90 (m / s) 2. Calculate the flat roll biting speed of each pass

[0312] The diameter of the rough rolling work roll is 1129.9 mm;

[0313] The rolling speed, entry temperature and reduction of each pass are calculated as shown in the following table:

[0314]

[0315] According to formula (2)

[0316] v0(1) = v(1)*(0.85 - 0.0005*en_temp(1)*sqrt(d / 2*red(1)) / (d / 2-red(1) / 2))

[0317] = 2.70*(0.85 - 0.0005*1221.6*sqrt(1129.9 / 2*45.1) / (1129.9 / 2-45.1 / 2))

[0318] = 1.81 (m / s)

[0319] v0(2) = v(2)*(0.85 - 0.0005*en_temp(2)*sqrt(d / 2*red(2)) / (d / 2-red(2) / 2))

[0320] = 4.00*(0.85 - 0.0005*1215.9*sqrt(1129.9 / 2*44.4) / (1129.9 / 2-44.4 / 2))

[0321] = 2.69 (m / s)

[0322] v0(3) = v(3)*(0.85 - 0.0005*en_temp(3)*sqrt(d / 2*red(3)) / (d / 2-red(3) / 2))

[0323] = 4.50*(0.85 - 0.0005*1209.9*sqrt(1129.9 / 2*35.5) / (1129.9 / 2-35.5 / 2))

[0324] = 3.12 (m / s)

[0325] v0(4) = 4.70 * (0.85 - 0.0005 * 1196.2 * sqrt(1129.9 / 2 * 31.4) / (1129.9 / 2 - 31.4 / 2))

[0326] v(4) * (0.85 - 0.0005 * en_temp(4) * sqrt(d / 2 * red(4) / (d / 2 - red(4) / 2))

[0327] = 4.70 * (0.85 - 0.0005 * 1196.2 * sqrt(1129.9 / 2 * 31.4) / (1129.9 / 2 - 31.4 / 2))

[0328] = 3.31 (m / s)

[0329] v0(5) = v(5) * (0.85 - 0.0005 * en_temp(5) * sqrt(d / 2 * red(5) / (d / 2 - red(5) / 2))

[0330] = 4.90 * (0.85 - 0.0005 * 1187 * sqrt(1129.9 / 2 * 21.7) / (1129.9 / 2 - 21.7 / 2))

[0331] = 3.58 (m / s)

[0332] 3. Calculate the speed of the roll and the speed of the bite between the flat roll and the vertical roll

[0333] The front slip and the back slip of each pass of the flat roll are as follows:

[0334]

[0335] (1) Calculate the speed of the roll and the speed of the bite between the flat roll and the vertical roll

[0336] According to Table 3, the roll correction coefficient corr_roll is 0.03, and according to formula (3) and formula (4), the roll speed and the bite speed of each pass are calculated as follows:

[0337] v_roll(1) = v(1) * bslip(1) * (1 - corr_roll) = 2.70 * 0.828 * (1 - 0.03) = 2.17 (m / s)

[0338] v0_roll(1) = v0(1) * bslip(1) * (1 - corr_roll) = 1.81 * 0.828 * (1 - 0.03) = 1.45 (m / s)

[0339] v0_roll(1) = v0(1) * bslip(1) * (1 - corr_roll) = 1.81 * 0.828 * (1 - 0.03) = 1.45 (m / s)

[0340] v roll (3) = v (3) * bslip (3) * (1 - corr roll) = 4.50 * 0.777 * (1 - 0.03) = 3.39 (m / s)

[0341] v0 roll (3) = v0 (3) * bslip (3) * (1 - corr roll) = 3.12 * 0.777 * (1 - 0.03) = 2.35 (m / s)

[0342] v roll (5) = v (5) * bslip (5) * (1 - corr roll) = 4.90 * 0.733 * (1 - 0.03) = 3.48 (m / s)

[0343] v0 roll (5) = v0 (5) * bslip (5) * (1 - corr roll) = 3.58 * 0.733 * (1 - 0.03) = 2.55 (m / s)

[0344] (2) Even pass roll speed calculation

[0345] According to formula (5), formula (6), each pass roll speed, bite speed calculation is as follows:

[0346] v roll (2) = v (2) * fslip (2) * (1 + corr roll * 0.6) = 4.00 * 1.045 * (1 + 0.03 * 0.6) = 4.26 (m / s)

[0347] v0 roll (2) = v0 (2) * fslip (2) * (1 + corr roll * 0.6) = 2.69 * 1.045 * (1 + 0.03 * 0.6) = 2.86 (m / s)

[0348] v roll (4) = v (4) * fslip (4) * (1 + corr roll * 0.6) = 4.70 * 1.063 * (1 + 0.03 * 0.6) = 5.09 (m / s)

[0349] v0 roll (4) = v0 (4) * fslip (4) * (1 + corr roll * 0.6) = 3.31 * 1.063 * (1 + 0.03 * 0.6) = 3.59 (m / s)

[0350] 4. Calculate the roll speed, bite speed

[0351] (1) Odd pass roll speed calculation

[0352] According to Table 4, the edger correction coefficient corr_E takes the value 0.024, according to formula (7), formula (8), the odd each pass edger rolling

[0353] The calculation of the speed and biting steel speed is as follows:

[0354] v_E(1) = v(1) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0355] = 2.70 * 0.828 * (1 - 0.03) * (1 - 0.024) = 2.12 (ms / )

[0356] v0_E(1) = v0(1) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0357] = 1.81 * 0.828 * (1 - 0.03) * (1 - 0.024) = 1.42 (ms / )

[0358] v_E(3) = v(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0359] = 4.50 * 0.777 * (1 - 0.03) * (1 - 0.024) = 3.31 (ms / )

[0360] v0_E(3) = v0(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0361] = 3.12 * 0.777 * (1 - 0.03) * (1 - 0.024) = 2.30 (ms / )

[0362] v_E(5) = v(5) * bslip(5) * (1 - corr_roll) * (1 - corr_E)

[0363] = 4.90 * 0.733 * (1 - 0.03) * (1 - 0.024) = 3.40 (ms / )

[0364] v0_E(5) = v0(5) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0365] = 3.58 * 0.733 * (1 - 0.03) * (1 - 0.024) = 2.49 (ms / )

[0366] (2) Even pass edger speed calculation

[0367] According to formula (9), formula (10), the speed of the odd pass of each pass, the bite speed is calculated as follows:

[0368] v_E(2) = v(2) * fslip(2) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0369] = 4.00 * 1.045 * (1 + 0.03 * 0.6) * (1 + 0.024 * 0.7) = 4.33 (ms / )

[0370] v0_E(2) = v0(2) * fslip(2) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0371] = 2.69 * 1.045 * (1 + 0.03 * 0.6) * (1 + 0.024 * 0.7) = 2.91 (ms / )

[0372] v_E(4) = v(4) * fslip(4) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0373] = = 4.70 * 1.063 * (1 + 0.03 * 0.6) * (1 + 0.024 * 0.7) = 5.17 (ms / )

[0374] v0_E(4) = v0(4) * fslip(4) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0375] = 3.31 * 1.063 * (1 + 0.03 * 0.6) * (1 + 0.024 * 0.7) = 3.65 (ms / )

[0376] 5. Determine the speed direction and correct the forward and reverse pass speed

[0377] According to formula (11) to formula (16), the speed direction is determined and the forward and reverse pass speed is corrected. After correction, the first, third, fifth and seventh passes are positive, and the second and fourth passes are negative.

[0378] The final calculated values of the flat roll rolling speed, flat roll bite speed, roll rolling speed, roll bite speed, vertical roll rolling speed, vertical roll bite speed and the parameters are as follows:

[0379]

[0380]

[0381] Example 4:

[0382] This example rolled 400 series stainless steel, grade: SUS430; coil number: 94B741301, billet thickness 200mm, billet width 1244mm; rough rolling target thickness 37mm, target temperature 1020°C; finished product thickness 4.0mm, finished product width target 1257mm.

[0383] The rough rolling used 5 passes, and the rough rolling speed was calculated as follows for each part:

[0384] 1. Calculate the flat roller rolling speed of each pass

[0385] According to Table 1, Table 2, the pass coefficient coff and the additional coefficient add_coff of each pass are as follows:

[0386]

[0387] According to formula (1), the flat roller rolling speed of each pass is calculated as follows:

[0388] v(1) = kvv0 + 1 * kvv1 / (passno + coff) + add_coff = 2.2 + 1 * 2.5 / (5 + 0.0) + 0.0 = 2.70 (m / s)

[0389] v(2) = kvv0 + 2 * kvv1 / (passno + coff) + add_coff = 2.2 + 2 * 2.5 / (5 + 0.0) + 0.0 = 3.20 (m / s)

[0390] v(3) = kvv0 + 3 * kvv1 / (passno + coff) + add_coff = 2.2 + 3 * 2.5 / (5 + 0.0) + 0.1 = 3.80 (m / s)

[0391] v(4) = kvv0 + 4 * kvv1 / (passno + coff) + add_coff = 2.2 + 4 * 2.5 / (5 + 0.0) + 0.3 = 4.50 (m / s)

[0392] v(5) = kvv0 + 5 * kvv1 / (passno + coff) + add_coff = 2.2 + 5 * 2.5 / (5 + 0.0) + 0.2 = 4.90 (m / s)

[0393] 2. Calculate the flat roller biting speed of each pass

[0394] The work roll diameter of rough rolling is 1128.4mm;

[0395] The rolling speed, inlet temperature and reduction of each pass are calculated as follows:

[0396]

[0397] According to equation (2)

[0398] v0(1) = v(1) * (0.85 - 0.0005 * en_temp(1) * sqrt(d / 2 * red(1) / (d / 2 - red(1) / 2))

[0399] = 2.70 * (0.85 - 0.0005 * 1125.5 * sqrt(1128.4 / 2 * 47.1) / (1128.4 / 2 - 47.1 / 2))

[0400] = 1.84 (m / s)

[0401] v0(2) = v(2) * (0.85 - 0.0005 * en_temp(2) * sqrt(d / 2 * red(2) / (d / 2 - red(2) / 2))

[0402] = 3.20 * (0.85 - 0.0005 * 1108.4 * sqrt(1128.40 / 2 * 42.9) / (1128.40 / 2 - 42.9 / 2))

[0403] = 2.21 (m / s)

[0404] v0(3) = v(3) * (0.85 - 0.0005 * en_temp(3) * sqrt(d / 2 * red(3) / (d / 2 - red(3) / 2))

[0405] = 3.80 * (0.85 - 0.0005 * 1091.3 * sqrt(1128.40 / 2 * 31.4) / (1128.40 / 2 - 31.4 / 2))

[0406] = 2.73 (m / s)

[0407] v0(4) = v(4) * (0.85 - 0.0005 * en_temp(4) * sqrt(d / 2 * red(4) / (d / 2 - red(4) / 2))

[0408] = 4.50 * (0.85 - 0.0005 * 1065.2 * sqrt(1128.40 / 2 * 27.3) / (1128.40 / 2 - 27.3 / 2))

[0409] = 3.28 (m / s)

[0410] v0(5) = v(5) * (0.85 - 0.0005 * en_temp(5) * sqrt(d / 2*red(5) / (d / 2 - red(5) / 2))

[0411] = 4.90 * (0.85 - 0.0005 * 1048.2 * sqrt(1128.40 / 2*16.8 / (1128.40 / 2 - 16.8 / 2))

[0412] = 3.72 (m / s)

[0413] 3. Calculate the speed of the roller and the speed of the bite

[0414] The front slip and the back slip of the flat roller in each pass are as follows:

[0415]

[0416] (1) Calculate the speed of the roller in the odd pass

[0417] According to Table 3, the roller correction coefficient corr_roll is 0.02, and according to formula (3) and formula (4), the roller rolling speed and the bite speed in each pass are calculated as follows:

[0418] v_roll(1) = v(1) * bslip(1) * (1 - corr_roll) = 2.70 * 0.8 * (1 - 0.02) = 2.12 (m / s)

[0419] v0_roll(1) = v0(1) * bslip(1) * (1 - corr_roll) = 1.84 * 0.8 * (1 - 0.02) = 1.44 (m / s)

[0420] v_roll(3) = v(3) * bslip(3) * (1 - corr_roll) = 3.80 * 0.762 * (1 - 0.02) = 2.84 (m / s)

[0421] v0_roll(3) = v0(3) * bslip(3) * (1 - corr_roll) = 2.73 * 0.762 * (1 - 0.02) = 2.04 (m / s)

[0422] v_roll(5) = v(5) * bslip(5) * (1 - corr_roll) = 4.90 * 0.738 * (1 - 0.02) = 3.54 (m / s)

[0423] v0_roll(5) = v0(5) * bslip(5) * (1 - corr_roll) = 3.72 * 0.738 * (1 - 0.02) = 2.68 (m / s)

[0424] v0_roll(5) = v0(5) * bslip(5) * (1 - corr_roll) = 3.72 * 0.738 * (1 - 0.02) = 2.69 (m / s)

[0425] (2) Even pass roll speed calculation

[0426] According to formula (5), formula (6), each pass roll speed, bite speed calculation as follows:

[0427] v_roll(2) = v(2) * fslip(2) * (1 + corr_roll * 0.6) = 3.20 * 1.052 * (1 + 0.02 * 0.6) = 3.41 (m / s)

[0428] v0_roll(2) = v0(2) * fslip(2) * (1 + corr_roll * 0.6) = 2.21 * 1.052 * (1 + 0.02 * 0.6) = 2.35 (m / s)

[0429] v_roll(4) = v(4) * fslip(4) * (1 + corr_roll * 0.6) = 4.50 * 1.069 * (1 + 0.02 * 0.6) = 4.87 (m / s)

[0430] v0_roll(4) = v0(4) * fslip(4) * (1 + corr_roll * 0.6) = 3.28 * 1.069 * (1 + 0.02 * 0.6) = 3.55 (m / s)

[0431] 4. Calculate the roll speed, bite speed

[0432] (1) Odd pass roll speed calculation

[0433] According to table 4, the roll correction coefficient corr_E is 0.016, according to formula (7), formula (8), the odd pass roll speed, bite speed calculation as follows:

[0434]

[0435] v_E(1) = v(1) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0436] = 2.70 * 0.8 * (1 - 0.02) * (1 - 0.016) = 2.08 (ms / )

[0437] v0_E(1) = v0(1) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0438] ​= 1.84 * 0.8 * (1 - 0.02) * (1 - 0.016) = 1.42 (ms / )

[0439] v_E(3) = v(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0440] = 3.80 * 0.762 * (1 - 0.02) * (1 - 0.016) = 2.79 (ms / )

[0441] v0_E(3) = v0(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0442] = 2.73 * 0.762 * (1 - 0.02) * (1 - 0.016) = 2.00 (ms / )

[0443] v_E(5) = v(5) * bslip(5) * (1 - corr_roll) * (1 - corr_E)

[0444] = 4.90 * 0.738 * (1 - 0.02) * (1 - 0.016) = 3.49 (ms / )

[0445] v0_E(5) = v0(5) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0446] = 3.72 * 0.738 * (1 - 0.02) * (1 - 0.016) = 2.64 (ms / )

[0447] (2) Even pass stand roll speed calculation

[0448] According to formula (9), formula (10), the even pass each pass stand rolling speed, bite steel speed is calculated as follows:

[0449] v_E(2) = v(2) * fslip(2) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0450] = 3.20 * 1.052 * (1 + 0.02 * 0.6) * (1 + 0.016 * 0.7) = 3.44 (ms / )

[0451] v0_E(2) = v0(2) * fslip(2) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0452] = 2.21 * 1.052 * (1 + 0.02 * 0.6) * (1 + 0.016 * 0.7) = 2.38 (ms / )

[0453] v_E(4) = v(4) * fslip(4) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0454] = 4.50 * 1.069 * (1 + 0.02 * 0.6) * (1 + 0.016 * 0.7) = 4.92 (m / s)

[0455] v0_E(4) = v0(4) * fslip(4) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0456] = 3.28 * 1.069 * (1 + 0.02 * 0.6) * (1 + 0.016 * 0.7) = 3.49 (m / s)

[0457] 5. Determine the speed direction, correct the forward and reverse pass speed

[0458] According to formula (11) to formula (16), the speed direction is determined, and the forward and reverse pass speeds are corrected. After correction, all speeds of the 1st, 3rd, 5th and 7th passes are positive, and the 2nd and 4th passes are negative.

[0459] The final calculated values of the flat roller rolling speed, flat roller biting speed, roller table rolling speed, roller table biting speed, vertical roller rolling speed, vertical roller biting speed and the parameters are as follows:

[0460]

[0461] According to the above accurately calculated speeds, the strip rolling is stable, there is no slipping phenomenon, and no surface defects such as scratches.

[0462] Example 5

[0463] This example rolls high magnetic induction oriented silicon steel, steel grade: DQ03; steel coil number: 94B425001, billet thickness 222mm, billet width 1057mm; rough rolling target thickness 47mm, target temperature 1000℃; finished product thickness 2.3mm, finished product width target 1070mm.

[0464] The rough rolling adopts 5 passes, and the speed of each part of the rough rolling is calculated as follows:

[0465] 1. Calculate the flat roller rolling speed of each pass

[0466] According to table 1 and table 2, the pass coefficient coff and the additional coefficient add_coff of each pass are as follows:

[0467]

[0468] According to equation (1), the flat rolling speed of each pass is calculated as follows:

[0469] v(1) = kvv0 + 1*kvv1 / (passno + coff) + add_coff = 2.2 + 1*2.5 / (5 + 0.0) + 0.0 = 2.70 (m / s)

[0470] v(2) = kvv0 + 2*kvv1 / (passno + coff) + add_coff = 2.2 + 2*2.5 / (5 + 0.0) + 0.8 = 4.00 (m / s)

[0471] v(3) = kvv0 + 3*kvv1 / (passno + coff) + add_coff = 2.2 + 3*2.5 / (5 + 0.0) + 0.8 = 4.50 (m / s)

[0472] v(4) = kvv0 + 4*kvv1 / (passno + coff) + add_coff = 2.2 + 4*2.5 / (5 + 0.0) + 0.5 = 4.70 (m / s)

[0473] v(5) = kvv0 + 5*kvv1 / (passno + coff) + add_coff = 2.2 + 5*2.5 / (5 + 0.0) + 0.2 = 4.90 (m / s)

[0474] 2. Calculate the flat rolling speed of each pass

[0475] The roughing work roll diameter: 1132.2 mm;

[0476] The rolling speed, entry temperature and reduction of each pass are calculated as follows:

[0477]

[0478] According to equation (2)

[0479] v0(1) = v(1)*(0.85 - 0.0005*en_temp(1)*sqrt(d / 2*red(1) / (d / 2 - red(1) / 2))

[0480] = 2.70*(0.85 - 0.0005*1097.8*sqrt(1132.2 / 2*53.3) / (1128.4 / 2 - 53.3 / 2))

[0481] = 1.82 (m / s)

[0482] v0(2) = v(2) * (0.85 - 0.0005 * en_temp(2) * sqrt(d / 2 * red(2) / (d / 2 - red(2) / 2))

[0483] = 4.00 * (0.85 - 0.0005 * 1086.1 * sqrt(1132.2 / 2 * 52.6) / (1128.40 / 2 - 52.6 / 2))

[0484] = 2.71 (m / s)

[0485] v0(3) = v(3) * (0.85 - 0.0005 * en_temp(3) * sqrt(d / 2 * red(3) / (d / 2 - red(3) / 2))

[0486] = 4.50 * (0.85 - 0.0005 * 1077.1 * sqrt(1132.2 / 2 * 29.2) / (1128.40 / 2 - 29.2 / 2))

[0487] = 3.26 (m / s)

[0488] v0(4) = v(4) * (0.85 - 0.0005 * en_temp(4) * sqrt(d / 2 * red(4) / (d / 2 - red(4) / 2))

[0489] = 4.70 * (0.85 - 0.0005 * 1060.1 * sqrt(1132.2 / 2 * 25.5) / (1128.40 / 2 - 25.5 / 2))

[0490] = 3.45 (m / s)

[0491] v0(5) = v(5) * (0.85 - 0.0005 * en_temp(5) * sqrt(d / 2 * red(5) / (d / 2 - red(5) / 2))

[0492] = 4.90 * (0.85 - 0.0005 * 1048.3 * sqrt(1132.2 / 2 * 17.5) / (1128.40 / 2 - 17.5 / 2))

[0493] = 3.71 (m / s)

[0494] 3. Calculate the speed of the roller and the speed of the bite

[0495] The front slip and back slip values of each pass are as follows:

[0496]

[0497] (1) Odd pass roll speed calculation

[0498] According to Table 3, the roll correction coefficient corr_roll is 0.035, according to formula (3), formula (4), the roll speed of each pass is calculated as follows:

[0499] The bite speed is calculated as follows:

[0500] v_roll(1) = v(1) * bslip(1) * (1 - corr_roll) = 2.70 * 0.796 * (1 - 0.035) = 2.07 (m / s)

[0501] v0_roll(1) = v0(1) * bslip(1) * (1 - corr_roll) = 1.82 * 0.796 * (1 - 0.035) = 1.40 (m / s)

[0502] v_roll(3) = v(3) * bslip(3) * (1 - corr_roll) = 4.50 * 0.793 * (1 - 0.035) = 3.44 (m / s)

[0503] v0_roll(3) = v0(3) * bslip(3) * (1 - corr_roll) = 3.26 * 0.793 * (1 - 0.035) = 2.49 (m / s)

[0504] v_roll(5) = v(5) * bslip(5) * (1 - corr_roll) = 4.90 * 0.774 * (1 - 0.035) = 3.66 (m / s)

[0505] v0_roll(5) = v0(5) * bslip(5) * (1 - corr_roll) = 3.71 * 0.774 * (1 - 0.035) = 2.77 (m / s)

[0506] (2) Even pass roll speed calculation

[0507] According to formula (5), formula (6), the roll speed of each pass is calculated as follows:

[0508] v_roll(2) = v(2) * fslip(2) * (1 + corr_roll * 0.6) = 4.00 * 1.056 * (1 + 0.035 * 0.6) = 4.31 (m / s)

[0509] v0_roll(2) = v0(2) * fslip(2) * (1 + corr_roll * 0.6) = 2.71 * 1.056 * (1 + 0.035 * 0.6) = 2.92 (m / s)

[0510] v_roll(4) = v(4) * fslip(4) * (1 + corr_roll * 0.6) = 4.70 * 1.058 * (1 + 0.035 * 0.6) = 5.08 (m / s)

[0511] v0_roll(4) = v0(4) * fslip(4) * (1 + corr_roll * 0.6) = 3.45 * 1.058 * (1 + 0.035 * 0.6) = 3.73 (m / s)

[0512] 4. Calculate the speed of vertical roll rolling, bite speed

[0513] (1) Calculate the speed of odd pass vertical roll

[0514] According to table 4, the vertical roll correction coefficient corr_E is 0.028, according to formula (7), formula (8), the speed of odd pass vertical roll rolling and bite speed is calculated as follows:

[0515]

[0516] v_E(1) = v(1) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0517] = 2.70 * 0.796 * (1 - 0.035) * (1 - 0.028) = 2.02 (m / s)

[0518] v0_E(1) = v0(1) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0519] = 1.82 * 0.796 * (1 - 0.035) * (1 - 0.028) = 1.36 (m / s)

[0520] v_E(3) = v(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0521] = 4.50 * 0.793 * (1 - 0.035) * (1 - 0.028) = 3.35 (m / s)

[0522] v0_E(3) = v0(3) * bslip(3) * (1 - corr_roll) * (1 - corr_E)

[0523] ​= 3.26 * 0.793 * (1 - 0.035) * (1 - 0.028) = 2.42 (ms / )

[0524] v_E(5) = v(5) * bslip(5) * (1 - corr_roll) * (1 - corr_E)

[0525] = 4.90 * 0.774 * (1 - 0.035) * (1 - 0.028) = 3.56 (ms / )

[0526] v0_E(5) = v0(5) * bslip(1) * (1 - corr_roll) * (1 - corr_E)

[0527] = 3.71 * 0.774 * (1 - 0.035) * (1 - 0.028) = 2.69 (ms / )

[0528] (2) Even pass stand roll speed calculation

[0529] According to formula (9), formula (10), the even pass each pass stand rolling speed, bite steel speed is calculated as follows:

[0530] v_E(2) = v(2) * fslip(2) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0531] = 4.00 * 1.056 * (1 + 0.035 * 0.6) * (1 + 0.028 * 0.7) = 4.40 (ms / )

[0532] v0_E(2) = v0(2) * fslip(2) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0533] = 2.71 * 1.056 * (1 + 0.035 * 0.6) * (1 + 0.028 * 0.7) = 2.97 (ms / )

[0534] v_E(4) = v(4) * fslip(4) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0535] = 4.70 * 1.058 * (1 + 0.035 * 0.6) * (1 + 0.028 * 0.7) = 5.18 (ms / )

[0536] v0_E(4) = v0(4) * fslip(4) * (1 + corr_roll * 0.6) * (1 + corr_E * 0.7)

[0537] = 3.45 * 1.058 * (1 + 0.035 * 0.6) * (1 + 0.028 * 0.7) = 3.80 (m / s)

[0538] 5. Determine the speed direction, correct the forward and reverse pass speed

[0539] According to formula (11) to formula (16), the speed direction is determined, and the forward and reverse pass speeds are corrected. After correction, the first, third, fifth, and seventh passes of all speeds are positive, and the second and fourth passes are negative.

[0540] The final calculated values of the flat roller rolling speed, flat roller biting speed, roller table rolling speed, roller table biting speed, vertical roller rolling speed, and vertical roller biting speed, as well as the parameters, are as follows:

[0541]

[0542]

[0543] Control each speed calculated accurately as described above, and the strip rolling is stable, without slipping phenomenon, no surface defects such as scratches.

[0544] Example 6:

[0545] This example rolls titanium plate, steel grade: TA1; steel coil number: 949157101, billet thickness 199mm, billet width 1292mm; rough rolling target thickness 35mm, target temperature 750℃; finished product thickness 4.1mm, finished product width target 1302mm.

[0546] The rough rolling adopts 7 passes, and the rough rolling speed of each part is calculated as follows:

[0547] 1. Calculate the flat roller rolling speed of each pass

[0548] According to Table 1 and Table 2, the pass coefficient coff and the additional coefficient add_coff of each pass are as follows:

[0549]

[0550] According to formula (1), the flat roller rolling speed of each pass is calculated as follows:

[0551] v(1) = kvv0 + 1 * kvv1 / (passno + coff) + add_coff = 2.2 + 1 * 2.5 / (7 + 0) - 1.45 = 1.25 (m / s)

[0552] v(2) = kvv0 + 2 * kvv1 / (passno + coff) + add_coff = 2.2 + 2 * 2.5 / (7 + 0) - 1.45 = 1.75 (m / s)

[0553] v(3) = kvv0 + 3*kvv1 / (passno + coff) + add_coff = 2.2 + 3*2.5 / (7 + 0) - 1.45 = 2.25 (m / s)

[0554] v(4) = kvv0 + 4*kvv1 / (passno + coff) + add_coff = 2.2 + 4*2.5 / (7 + 0) - 1.5 = 2.70 (m / s)

[0555] v(5) = kvv0 + 5*kvv1 / (passno + coff) + add_coff = 2.2 + 5*2.5 / (7 + 0) - 1.5 = 2.84 (m / s)

[0556] v(6) = kvv0 + 6*kvv1 / (passno + coff) + add_coff = 2.2 + 6*2.5 / (7 + 0) - 1.5 = 3.87 (m / s)

[0557] v(7) = kvv0 + 7*kvv1 / (passno + coff) + add_coff = 2.2 + 7*2.5 / (7 + 0) - 0.6 = 4.10 (m / s)

[0558] 2. Calculate the flat roll biting speed of each pass

[0559] The diameter of the rough rolling work roll is 1133.9 mm;

[0560] The rolling speed, entry temperature and reduction of each pass are calculated as follows:

[0561]

[0562] According to formula (2)

[0563] v0(1) = v(1)*(0.85 - 0.0005*en_temp(1)*sqrt(d / 2*red(1)) / (d / 2-red(1) / 2))

[0564] = 1.25*(0.85 - 0.0005*855.2*sqrt(1133.9 / 2*26.5) / (1133.9 / 2-26.5 / 2))

[0565] = 0.94 (m / s)

[0566] v0(2) = v(2)*(0.85 - 0.0005*en_temp(2)*sqrt(d / 2*red(2)) / (d / 2-red(2) / 2))

[0567] = 1.75 * (0.85 - 0.0005 * 845.4 * sqrt(1133.9 / 2*30.8) / (1133.9 / 2 - 30.8 / 2))

[0568] = 1.31 (m / s)

[0569] v0(3) = v(3) * (0.85 - 0.0005 * en_temp(3) * sqrt(d / 2*red(3) / (d / 2 - red(3) / 2))

[0570] = 2.25 * (0.85 - 0.0005 * 838.9 * sqrt(1133.9 / 2*28.1) / (1133.9 / 2 - 28.1 / 2))

[0571] = 1.71 (m / s)

[0572] v0(4) = v(4) * (0.85 - 0.0005 * en_temp(4) * sqrt(d / 2*red(4) / (d / 2 - red(4) / 2))

[0573] = 2.70 * (0.85 - 0.0005 * 828 * sqrt(1133.9 / 2*26.4) / (1133.9 / 2 - 26.4 / 2))

[0574] = 2.04 (m / s)

[0575] v0(5) = v(5) * (0.85 - 0.0005 * en_temp(5) * sqrt(d / 2*red(5) / (d / 2 - red(5) / 2))

[0576] = 3.20 * (0.85 - 0.0005 * 821.3 * sqrt(1133.9 / 2*22.3) / (1133.9 / 2 - 22.3 / 2))

[0577] = 2.45 (m / s)

[0578] v0(6) = v(6) * (0.85 - 0.0005 * en_temp(1) * sqrt(d / 2*red(1) / (d / 2 - red(1) / 2))

[0579] = 2.84 * (0.85 - 0.0005 * 804.6 * sqrt(1133.9 / 2*19.6) / (1133.9 / 2 - 19.6 / 2))

[0580] = 2.20 (m / s)

[0581] v0(7) = v(7) * (0.85 - 0.0005 * en_temp(7) * sqrt(d / 2*red(7) / (d / 2-red(7) / 2))

[0582] = 4.10 * (0.85 - 0.0005 * 795.4 * sqrt(1133.9 / 2*13.3) / (1133.9 / 2-13.3 / 2))

[0583] = 3.23 (m / s)

[0584] 3. Calculate the roll speed and bite speed between the flat roller and the vertical roller

[0585] The front slip and back slip values of each pass flat roller are as follows:

[0586]

[0587] (1) Calculate the odd pass roll speed

[0588] According to Table 3, the roll correction coefficient corr_roll is 0.01, according to formula (3), formula (4), the roll speed and bite speed of each pass are calculated as follows:

[0589]

[0590] v_roll(1) = v(1) * bslip(1) * (1 - corr_roll) = 1.25 * 0.889 * (1 - 0.01) = 1.10 (m / s)

[0591] v0_roll(1) = v0(1) * bslip(1) * (1 - corr_roll) = 0.94 * 0.889 * (1 - 0.01) = 0.83 (m / s)

[0592] v_roll(3) = v(3) * bslip(3) * (1 - corr_roll) = 2.25 * 0.854 * (1 - 0.01) = 1.90 (m / s)

[0593] v0_roll(3) = v0(3) * bslip(3) * (1 - corr_roll) = 1.71 * 0.854 * (1 - 0.01) = 1.45 (m / s)

[0594] v_roll(5) = v(5) * bslip(5) * (1 - corr_roll) = 3.20 * 0.792 * (1 - 0.01) = 2.51 (m / s)

[0595] ​v0_roll(5) = v0(5) * bslip(5) * (1 - corr_roll) = 2.45 * 0.792 * (1 - 0.01) = 1.92 (m / s)

[0596] v_roll(7) = v(7) * bslip(7) * (1 - corr_roll) = 4.10 * 0.772 * (1 - 0.01) = 3.13 (m / s)

[0597] v0_roll(7) = v0(7) * bslip(7) * (1 - corr_roll) = 3.23 * 0.772 * (1 - 0.01) = 2.47 (m / s)

[0598] (2) Even pass roll speed calculation

[0599] According to formula (5), formula (6), each pass roll speed, bite speed is calculated as follows:

[0600] v_roll(2) = v(2) * fslip(2) * (1 + corr_roll * 0.6) = 1.75 * 1.032 * (1 + 0.01 * 0.6) = 1.82 (m / s)

[0601] v0_roll(2) = v0(2) * fslip(2) * (1 + corr_roll * 0.6) = 1.31 * 1.032 * (1 + 0.01 * 0.6) = 1.36 (m / s)

[0602] v_roll(4) = v(4) * fslip(4) * (1 + corr_roll * 0.6) = 2.70 * 1.047 * (1 + 0.01 * 0.6) = 2.84 (m / s)

[0603] v0_roll(4) = v0(4) * fslip(4) * (1 + corr_roll * 0.6) = 2.04 * 1.047 * (1 + 0.01 * 0.6) = 2.15 (m / s)

[0604] v_roll(6) = v(6) * fslip(6) * (1 + corr_roll * 0.6) = 2.84 * 1.062 * (1 + 0.01 * 0.6) = 3.05 (m / s)

[0605] v0_roll(6) = v0(6) * fslip(6) * (1 + corr_roll * 0.6) = 2.20 * 1.062 * (1 + 0.01 * 0.6) = 2.36 (m / s)

[0606] 4. Calculate the speed of the edger roll, the bite speed

[0607] (1) Calculate the speed of the edger roll of odd pass

[0608] According to Table 4, the edger correction coefficient corr_E is 0.008, according to formula (7), formula (8), the speed of the edger roll of odd pass is calculated as follows:

[0609]

[0610] v_E(1) = v(1) * bslip(1) * (1-corr_roll) * (1-corr_E)

[0611] = 1.25 * 0.889 * (1-0.01) * (1-0.008) = 1.09 (m / s)

[0612] v0_E(1) = v0(1) * bslip(1) * (1-corr_roll) * (1-corr_E)

[0613] = 0.94 * 0.889 * (1-0.01) * (1-0.008) = 0.82 (m / s)

[0614] v_E(3) = v(3) * bslip(3) * (1-corr_roll) * (1-corr_E)

[0615] = 2.25 * 0.854 * (1-0.01) * (1-0.008) = 1.89 (m / s)

[0616] v0_E(3) = v0(3) * bslip(3) * (1-corr_roll) * (1-corr_E)

[0617] = 1.71 * 0.854 * (1-0.01) * (1-0.008) = 1.43 (m / s)

[0618] v_E(5) = v(5) * bslip(5) * (1-corr_roll) * (1-corr_E)

[0619] = 3.20 * 0.792 * (1-0.01) * (1-0.008) = 2.49 (m / s)

[0620] v0_E(5) = v0(5) * bslip(1) * (1-corr_roll) * (1-corr_E)

[0621] = 2.45 * 0.792 * (1-0.01) * (1-0.008) = 1.91 (m / s)​

[0622] v_E(7) = v(7)*bslip(7)*(1-corr_roll)*(1-corr_E)

[0623] = 4.10*0.772*(1-0.01)*(1-0.008) = 3.11 (ms / )

[0624] v0_E(7) = v0(7)*bslip(7)*(1-corr_roll)*(1-corr_E)

[0625] = 3.23*0.772*(1-0.01)*(1-0.008) = 2.45 (ms / )

[0626] (2) Even pass stand roll speed calculation

[0627] According to formula (9), formula (10), the even pass each pass stand rolling speed, bite steel speed is calculated as follows:

[0628] v_E(2) = v(2)*fslip(2)*(1+corr_roll*0.6)*(1+corr_E*0.7)

[0629] = 1.75*1.032*(1+0.01*0.6)*(1+0.008*0.7) = 1.83 (ms / )

[0630] v0_E(2) = v0(2)*fslip(2)*(1+corr_roll*0.6)*(1+corr_E*0.7)

[0631] = 1.31*1.032*(1+0.01*0.6)*(1+0.008*0.7) = 1.37 (ms / )

[0632] v_E(4) = v(4)*fslip(4)*(1+corr_roll*0.6)*(1+corr_E*0.7)

[0633] = 2.70*1.047*(1+0.01*0.6)*(1+0.008*0.7) = 2.86 (ms / )

[0634] v0_E(4) = v0(4)*fslip(4)*(1+corr_roll*0.6)*(1+corr_E*0.7)

[0635] = 2.04*1.047*(1+0.01*0.6)*(1+0.008*0.7) = 2.16 (ms / )

[0636] v_E(6) = v(6) * fslip(6) * (1 + corr_roll*0.6) * (1 + corr_E*0.7)

[0637] = 2.84 * 1.062 * (1 + 0.01*0.6) * (1 + 0.008*0.7) = 3.05 (ms / )

[0638] v0_E(6) = v0(6) * fslip(6) * (1 + corr_roll*0.6) * (1 + corr_E*0.7)

[0639] = 2.20 * 1.062 * (1 + 0.01*0.6) * (1 + 0.008*0.7) = 2.36 (ms / )

[0640] 5. Determine the speed direction, correct the forward and reverse pass speed

[0641] According to the formula (11) to formula (16), the speed direction is determined, and the forward and reverse pass speeds are corrected. After correction, all the speeds of the 1st, 3rd, 5th and 7th passes are positive, and the 2nd and 4th passes are negative.

[0642] The final calculated values of the flat roller rolling speed, the flat roller biting speed, the roller table rolling speed, the roller table biting speed, the edger roller rolling speed, the edger roller biting speed and the parameters are as follows:

[0643]

[0644] According to the above accurately calculated speeds, the strip rolling is stable, there is no slipping phenomenon, and no surface defects such as scratches.

[0645] In the present application, the formula for calculating the flat roller rolling speed and the flat roller biting speed of each pass, the formula for calculating the roller table rolling speed and the roller table biting speed of each pass, and the formula for calculating the edger roller rolling speed and the edger roller biting speed of each pass are the empirical formulas summarized after the rolling test of each steel type on the 1450mm hot continuous rolling production line. The present application summarizes the relationship between the flat roller rolling speed, the flat roller biting speed and the edger roller rolling speed, the edger roller biting speed in the rough rolling of the 1450mm hot continuous rolling production line, and realizes the running speed of the flat roller and the edger roller in the rough rolling process. Adaptation, reduce the rate of defective products during rolling.

[0646] In the description of the present specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0647] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A rolling method for precisely controlling the speed of a rough rolling mill train, which is applied to a 1450 mm hot continuous rolling line, characterized in that, The rolling method for precisely controlling the speed of the rough rolling mill unit comprises: determining a steel type to be rolled; calculating the flat roll rolling speed of each pass in the rough rolling work according to the steel type, the method for calculating the flat roll rolling speed of each pass in the rough rolling work according to the steel type comprises: the calculation is specifically as follows: v(i)=kvv0+i*kvv1 / (passno+coff)+add_coff; calculating the flat roll biting speed of each pass in the rough rolling work according to the steel type, the method for calculating the flat roll biting speed of each pass in the rough rolling work according to the steel type comprises: v0(i)=v(i)*(0.85-0.0005*en_temp(i)*sqrt(d / 2*red(i)) / (d / 2-red(i) / 2)); calculating the roll table rolling speed and the roll table biting speed between the vertical roll and the flat roll according to the steel type, the flat roll rolling speed and the flat roll biting speed of each pass, the method for calculating the roll table rolling speed and the roll table biting speed between the vertical roll and the flat roll comprises: the roll table rolling speed and the roll table biting speed of the odd pass are as follows: v_roll(i)=v(i)*bslip(i)*(1-corr_roll), v0_roll(i)=v0(i)*bslip(i)*(1-corr_roll), the roll table rolling speed and the roll table biting speed of the even pass are as follows: v_roll(i)=v(i)*fslip(i)*(1+corr_roll*0.6), v0_roll(i)=v0(i)*fslip(i)*(1+corr_roll*0.6); calculating the vertical roll rolling speed and the vertical roll biting speed according to the steel type, the flat roll rolling speed and the flat roll biting speed of each pass, the vertical roll rolling speed and the vertical roll biting speed of the odd pass are calculated as follows: v_E(i)=v(i)*bslip(i)*(1-corr_roll)*(1-corr_E), v0_E(i)=v0(i)*bslip(i)*(1-corr_roll)*(1-corr_E), the vertical roll rolling speed and the vertical roll biting speed of the even pass are calculated as follows: v_E(i)=v(i)*fslip(i)*(1+corr_roll*0.6)*(1+corr_E*0, v0_E(i)=v0(i)*fslip(i)*(1+corr_roll*0.6)*(1+corr_E*0.7); correcting the flat roll rolling speed, the flat roll biting speed, the roll table rolling speed, the roll table biting speed, the vertical roll rolling speed and the vertical roll biting speed according to the rolling direction of each pass; wherein the correction formula is: v(i)e=(-1)i-1*v(i), v0(i)e=(-1)i-1*v0(i), v_roll(i)e = (-1) i-1 * v_roll(i), v0_roll(i)e = (-1) i-1 * v0_roll(i), v_E(i)e = (-1) i-1 * v_E(i), v0_E(i)e = (-1) i-1 * v0_E(i); In the above formula, i represents the current pass number, taking 1~7, the odd pass is positive rolling, and the even pass is reverse rolling, v(i) represents the i-th pass flat roller rolling speed, unit: m / s, kvv0 represents a constant term, taking 2.2, kvv1 represents a pass coefficient, taking 2.5, passno represents the total number of rolling passes, coff is a pass coefficient, add_coff is an additional coefficient, v0(i) represents the i-th pass flat roller biting speed, unit: m / s; en_temp(i) represents the i-th pass inlet temperature, indicating the calculated average temperature of the inlet strip surface and center, unit: ℃, red(i) represents the i-th pass reduction, unit: mm, d represents the working roller diameter, unit: mm, v_roll(i), v0_roll(i) represent the i-th pass roller rolling speed and roller biting speed, respectively, unit: m / s, bslip(i) represents the i-th pass flat roller post-slip coefficient, corr_roll represents the roller correction coefficient, which is related to the steel type, fslip(i) represents the i-th pass flat roller pre-slip coefficient, v_E(i), v0_E(i) represent the i-th pass vertical roller rolling speed and vertical roller biting speed, respectively, unit: m / s, corr_roll represents the roller correction coefficient, which is related to the steel type, corr_E represents the vertical roller correction coefficient, which is related to the steel type, v(i)e, v0(i)e, v_roll(i)e, v0_roll(i)e, v_E(i)e, v0_E(i)e represent the modified current pass flat roller rolling speed, flat roller biting speed, roller rolling speed, roller biting speed, vertical roller rolling speed, and vertical roller biting speed values, respectively.

2. The rolling method for precisely controlling the speed of a rough rolling train according to claim 1, characterized in that, The method for calculating the flat roller rolling speed of each pass in the rough rolling work according to the steel type further includes that coff is mainly used for speed compensation calculation of some steel types for 7 passes, which is related to the pass, steel type, thickness, and width, and the value is specifically taken according to the pass coefficient coff value table; add_coff is related to the number of passes, steel type, and pass, and the value is specifically taken according to the additional coefficient add_coff value table; ； 。 3. The rolling method for precisely controlling the speed of a rough rolling train according to claim 1, characterized in that, The method for calculating the roller rolling speed and roller biting speed between the vertical roller and the flat roller further includes a roller correction coefficient corr_roll value table, corr_roll is related to the steel type, and the specific value is shown in the roller correction coefficient corr_roll value table: 。 4. The rolling method for precisely controlling the speed of a rough rolling train according to claim 1, characterized in that, The method for calculating the vertical roller rolling speed and vertical roller biting speed further includes a vertical roller correction coefficient corr_E value table, corr_E is related to the steel type, and the specific value is shown in the vertical roller correction coefficient corr_E value table: 。

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