Rolling method for accurately controlling speed of roughing mill unit

Abstract

The invention belongs to the field of hot continuous rolling, and relates to a rolling method for accurately controlling the speed of a roughing mill unit. And the method is suitable for a 1450mm hot continuous rolling production line. The rolling method for accurately controlling the speed of the roughing rolling unit comprises the steps that the type of steel to be rolled is determined; calculating the flat roll rolling speed of each pass in rough rolling work according to the steel type; calculating the steel biting speed of a flat roller in each pass in rough rolling work according to the steel type; calculating the rolling speed and the steel biting speed of a roller bed between a vertical roller and a flat roller according to the steel type, the rolling speed of the flat roller in each pass and the steel biting speed of the flat roller; and according to the steel type and the flat roll rolling speed and the flat roll steel biting speed of each pass, the vertical roll rolling speed and the vertical roll steel biting speed are calculated.

Description

Technical Field

[0001] The invention belongs to the field of hot rolling and relates to a rolling method for accurately controlling the speed of a rough rolling unit. Background Art

[0002] The main production process of the 1450mm hot rolling production line is as follows: the slab is first heated in a heating furnace according to the temperature specified by the process, and then enters the rough rolling mill for rolling after being heated to the target temperature. The rough rolling vertical roll controls the width, and the flat roll controls the thickness. Reversible rolling is performed in the rough rolling mill, generally for 5 to 7 passes, with a minimum of 1 pass and a maximum of 7 passes. During the 1st, 3rd, 5th, and 7th odd passes, the vertical roll rolling is first performed to control the width, and the strip head enters the flat roll rolling to control the thickness after exiting the vertical roll. During the rolling of the flat roll and the vertical roll, the exit speed of the vertical roll is the entrance speed of the flat roll. After the tail of the strip exits the vertical roll, the part between the flat roll and the vertical roll is only rolled by the flat roll to complete the rolling of this pass; and during the 2nd, 4th, and 6th even passes, only the flat roll rolling is performed, and the opening of the vertical roll is released and not controlled.

[0003] After the rough rolling mill, the strip reaches the preset target thickness, width and temperature. Then it enters the finishing mill for seven-stand flat roll continuous rolling to make the strip reach the preset target thickness and temperature. Finally, the strip is formed into a coil by the coiler.

[0004] The rough rolling equipment mainly includes three parts: descaling, vertical rolls, and flat rolls. Rollers are arranged in front of the vertical rolls, between the vertical rolls and flat rolls, and after the flat rolls. This technology mainly studies the speeds of the vertical rolls, flat rolls, and rollers between the vertical rolls and flat rolls. The speeds of the remaining parts are still controlled according to the original control method. The rough rolling speed control is based on the flat rolls and is divided into two parts: the steel biting speed and the rolling speed. That is, the strip steel bites the steel at a lower steel biting speed and then increases the speed to the rolling speed for rolling. Accurate control of the rough rolling speed has a great impact on production, quality, and efficiency. If the speed is too fast, it is easy to cause production failures such as slipping and scratching or surface quality problems; if the speed is too slow, it will have a great impact on production efficiency. At present, the following problems mainly exist in actual production:

[0005] The rolling speed is not accurate. It does not match the actual production site. Some steel types slip frequently, such as cold-rolled materials, and some steel types are severely scratched, such as 400 series stainless steel. However, some steel types have neither slippage nor scratch 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, it will cause scrap steel biting, speed increase and slippage. After long-term research and test, it is found that on the basis of the determination of the rolling speed of each pass, the biting speed of each pass is correlated with the strip temperature, roll diameter and reduction, but the above factors are not considered in the existing technology.

[0007] There is a mismatch between the vertical roll speed, the roller speed between the vertical roll and the flat roll, and the flat roll speed. The prior art first calculates the flat roll bite speed and rolling speed, and then the vertical roll, the roller bite speed between the vertical roll and the flat roll, and the rolling speed are all obtained by multiplying the flat roll bite speed, the rolling speed, and the flat roll back slip (odd passes) or forward slip (even passes), that is, the vertical roll and the roller speed are the same, and the same as the flat roll entrance speed (odd passes) or exit speed (even passes). However, in the actual rolling process, forward slip or backward slip will be affected by many noise factors, and it is easy to collapse or lift between the vertical roll and the roller, between the roller and the flat roll, and between the vertical roll and the flat roll. In this case, scratch defects will easily occur. Summary of the invention

[0008] In order to overcome the defects in the above-mentioned related art, the present invention proposes a rolling method for accurately controlling the speed of a roughing mill. The rolling method for accurately controlling the speed of a roughing mill is suitable for a 1450mm hot rolling production line. The rolling method for accurately controlling the speed of a roughing mill comprises:

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

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

[0011] Calculate the flat roll biting speed of each pass in the rough rolling process according to the type of steel;

[0012] Calculate the roller rolling speed and roller bite speed between the vertical roller and the flat roller according to the type of steel, the flat roller rolling speed and the flat roller bite speed in each pass;

[0013] The vertical roll rolling speed and the vertical roll biting speed are calculated according to the steel type, the flat roll rolling speed and the flat roll biting speed in each pass.

[0014] The rolling method for accurately controlling the speed of the roughing mill unit further comprises: modifying the flat roll rolling speed, the flat roll biting speed, the roller table rolling speed, the roller 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-1*v(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, ranging from 1 to 7, odd passes are forward rolling, and even passes are 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 roll rolling speed, flat roll bite steel speed, roller rolling speed, roller bite steel speed, vertical roll rolling speed, vertical roll bite steel speed.

[0024] Speed ​​value;

[0025] v(i), v0(i), v_roll(i), v0_roll(i), v_E(i), and v0_E(i) respectively represent the current pass flat roll rolling speed, flat roll steel biting speed, roller table rolling speed, roller table steel biting speed, vertical roll rolling speed, and the calculated absolute value of the vertical roll steel biting speed.

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

[0027] The specific calculation is as follows:

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

[0029] Where i represents the current track number, ranging from 1 to 7;

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

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

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

[0033] passno indicates the total number of rolling passes. For example, if there are 5 rolling passes, the value is 5; if there are 7 rolling passes, the value is 7.

[0034] coff is the pass coefficient, which is mainly used for speed compensation calculation of certain steel grades in 7 passes. It is related to the pass, steel grade, thickness and width. The specific value is based on Table 1;

[0035] add_coff is an additional coefficient, which is related to the number of passes, steel type, and pass order. The specific value is given in 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 biting speed of each pass in the rough rolling process according to the steel 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] Where i represents the current track number, ranging from 1 to 7;

[0044] v0(i) represents the flat roller biting speed in the i-th pass, unit: m / s;

[0045] v(i) represents the rolling speed of the flat roll in the i-th pass, unit: 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, unit: °C;

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

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

[0049] The method for calculating the roller rolling speed between the vertical roller and the flat roller and the roller biting speed comprises:

[0050] The rolling speed of odd and secondary rollers and the roller 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] Where i represents the current track number, ranging from 1 to 7;

[0054] v_roll(i) and v0_roll(i) represent the rolling speed and the steel biting speed of the roller in the i-th pass, respectively, in m / s;

[0055] v(i) and v0(i) represent the rolling speed and the flat roll biting speed of the i-th pass, in m / s;

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

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

[0058] Table 3 Roller correction coefficient corr_roll value table

[0059] Steel Type corr_roll Ultra-pure stainless steel 0.03 400 Series Stainless Steel 0.02 High temperature oriented silicon steel 0.03 High magnetic induction oriented silicon steel 0.035 Carbon steel cold rolled 0.025 other 0.01

[0060] The even-pass roller rolling speed and roller 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] Where i represents the current track number, ranging from 1 to 7;

[0064] v_roll(i) and v0_roll(i) represent the rolling speed and the steel biting speed of the roller in the i-th pass, respectively, in m / s;

[0065] v(i) and v0(i) represent the rolling speed and the flat roll biting speed of the i-th pass, in m / s;

[0066] fslip(i) represents the forward slip coefficient of the flat roller in the i-th pass;

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

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

[0069] The calculation of odd-pass vertical roller rolling speed and vertical roller biting speed is 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] Where i represents the current track number, ranging from 1 to 7;

[0073] v_E(i) and v0_E(i) represent the rolling speed of the vertical roller and the steel biting speed of the vertical roller in the i-th pass, respectively, in m / s;

[0074] v(i) and v0(i) represent the rolling speed and the flat roll biting speed of the i-th pass, in m / s;

[0075] bslip(i) represents the back slip coefficient of the flat roller in the i-th pass;

[0076] corr_roll represents the roller correction coefficient, which is related to the steel type; the specific value is taken from Table 3;

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

[0078] Table 4 Vertical Roller Correction Factor corr_E Value Table

[0079] Steel Type corr_E Ultra-pure stainless steel 0.024 400 Series Stainless Steel 0.016 High temperature oriented silicon steel 0.024 High magnetic induction oriented silicon steel 0.028 Carbon steel cold rolled 0.02 other 0.008

[0080] The calculation of the even-pass vertical roller rolling speed and the vertical roller biting speed is as follows:

[0081] v_E(i)=v(i)*fslip(i)*(1+corr_roll*0.6)*(1+corr_E*0.

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

[0083] Where i represents the current track number, ranging from 1 to 7;

[0084] v_E(i) and v0_E(i) represent the rolling speed of the vertical roller and the steel biting speed of the vertical roller in the i-th pass, respectively, in m / s;

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

[0086] fslip(i) represents the forward slip coefficient of the flat roller in the i-th pass;

[0087] corr_roll represents the roller correction coefficient, which is related to the steel type; the specific value is taken from Table 3;

[0088] corr_E represents the correction coefficient of the vertical roller, which is related to the type of steel; the specific value is taken from Table 4.

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

[0090] Compared with the existing technology, after the implementation of this patented technology, the slippage and scratch defects existing in various steel grades are effectively eliminated, and the process requirements of various steel grades are met. On this basis, the rolling efficiency is improved to the greatest extent. After the patented technology is put into practical application, the amount of scrap is reduced by 1,789 tons / month, and the rolling efficiency is improved by 1.01%, with obvious economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0091] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0092] Figure 1 This is a diagram of the hot rolling equipment described in the present invention. DETAILED DESCRIPTION

[0093] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0094] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0095] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0096] like Figure 1 As shown, the present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples. The experimental methods without specific conditions in the following examples are based on conventional methods and conditions.

[0097] Embodiment 1:

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

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

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

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

[0102]

[0103] According to formula (1), the rolling speed of each pass of flat roll 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 roller biting speed of each pass

[0112] Rough rolling work roll diameter: 1135.08mm;

[0113] The calculated values ​​of rolling speed, inlet temperature and reduction for each pass are 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 rolling speed and steel biting speed between the flat roll and the vertical roll

[0138] The forward and backward slip values ​​of the flat rollers in each pass are as follows:

[0139]

[0140]

[0141] (1) Calculation of odd-pass roller speed

[0142] According to Table 3, the roller correction coefficient corr_roll is 0.01. According to formula (3) and formula (4), the roller rolling

[0143] The calculation of the braking speed and the steel biting speed is as follows:

[0144] v_roll(1)=v(1)*bslip(1)*(1-corr_roll)=2.65*0.916*(1-0.01)=2.40(m / s)

[0145] v0_roll(1)=v0(1)*bslip(1)*(1-corr_roll)=1.93*0.916*(1-0.01)=1.75(m / s)

[0146] v_roll(3)=v(3)*bslip(3)*(1-corr_roll)=3.45*0.852*(1-0.01)=2.91(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) Calculation of roller speed for even passes

[0153] According to formula (5) and formula (6), the rolling speed and steel biting speed of each pass are calculated 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 vertical roller rolling speed and steel biting speed

[0161] (1) Calculation of odd-order vertical roller speed

[0162] According to Table 4, the correction coefficient corr_E of the vertical roller is 0.008. According to formula (7) and formula (8), the vertical roller rolling of odd passes

[0163] The calculation of the braking speed and the steel biting speed is as follows:

[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) Calculation of vertical roller speed for even passes

[0181] According to formula (9) and formula (10), the rolling speed and steel biting speed of each pass of the even pass are 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 and correct the forward and reverse speeds

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

[0196] The final calculated values ​​and parameters of flat roll rolling speed, flat roll biting speed, roller table rolling speed, roller table biting speed, vertical roll rolling speed, vertical roll biting speed are summarized in the following table:

[0197]

[0198]

[0199] The speeds are controlled according to the above precise calculations, and the strip rolling is stable without slipping, scratches or other surface defects.

[0200] Embodiment 2:

[0201] This embodiment rolls high-strength steel, steel type: 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 adopts 7 passes, and the speed of each part of the rough rolling is calculated as follows:

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

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

[0205]

[0206] According to formula (1), the rolling speed of each pass of flat roll 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)=kvv0+7*kvv1 / (passno+coff)+add_coff=2.2+7*2.5 / (7+2.0)+0=4.14(m / s)2. Calculate the flat roller biting speed of each pass

[0214] Rough rolling work roll diameter: 1129.9mm;

[0215] The calculated values ​​of rolling speed, inlet temperature and reduction for each pass are 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 rolling speed and steel biting speed between the flat roll and the vertical roll

[0240] The forward and backward slip values ​​of the flat rollers in each pass are as follows:

[0241]

[0242] (1) Calculation of odd-pass roller speed

[0243] According to Table 3, the roller correction coefficient corr_roll is 0.01. According to formula (3) and formula (4), the roller rolling

[0244] The calculation of the braking speed and the steel biting speed is 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) Calculation of roller speed for even passes

[0254] According to formula (5) and formula (6), the rolling speed and steel biting 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 vertical roller rolling speed and steel biting speed

[0262] (1) Calculation of odd-order vertical roller speed

[0263] According to Table 4, the correction coefficient corr_E of the vertical roller is 0.008. According to formula (7) and formula (8), the vertical roller rolling of odd passes

[0264] The calculation of the braking speed and the steel biting speed is as follows:

[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) Calculation of vertical roller speed for even passes

[0282] According to formula (9) and formula (10), the rolling speed and steel biting speed of each pass of the even pass are 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 speed direction and correct the forward and reverse speeds

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

[0297] The final calculated values ​​and parameters of flat roll rolling speed, flat roll biting speed, roller table rolling speed, roller table biting speed, vertical roll rolling speed, vertical roll biting speed are summarized in the following table:

[0298]

[0299] The speeds are controlled according to the above precise calculations, and the strip rolling is stable without slipping, scratches or other surface defects.

[0300] Embodiment 3:

[0301] This embodiment rolls high temperature oriented silicon steel, steel type: DQ01; steel coil number: 94B518901, billet thickness 222mm, billet width 1081mm; rough rolling target thickness 47mm, target temperature 1110°C; finished product thickness 2.5mm, finished product width target 1055mm.

[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 rolling speed of each flat roll

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

[0305]

[0306] According to formula (1), the rolling speed of each pass of flat roll 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 roller biting speed of each pass

[0312] Rough rolling work roll diameter: 1129.9mm;

[0313] The calculated values ​​of rolling speed, inlet temperature and reduction for each pass are as follows:

[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)=

[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 rolling speed and steel biting speed between the flat roll and the vertical roll

[0333] The forward and backward slip values ​​of the flat rollers in each pass are as follows:

[0334]

[0335] (1) Calculation of odd-pass roller speed

[0336] According to Table 3, the roller correction coefficient corr_roll is 0.03. According to formula (3) and formula (4), the roller rolling

[0337] The calculation of the braking speed and the steel biting speed is as follows:

[0338] v_roll(1)=v(1)*bslip(1)*(1-corr_roll)=2.70*0.828*(1-0.03)=2.17(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) Calculation of roller speed for even passes

[0345] According to formula (5) and formula (6), the rolling speed and steel biting speed of each pass are calculated 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 vertical roller rolling speed and steel biting speed

[0351] (1) Calculation of odd-order vertical roller speed

[0352] According to Table 4, the correction coefficient corr_E of the vertical roller is 0.024. According to formula (7) and formula (8), the vertical roller rolling of odd passes

[0353] The calculation of the braking speed and the steel biting 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) Calculation of vertical roller speed for even passes

[0367] According to formula (9) and formula (10), the rolling speed and steel biting speed of each pass of the even pass are 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 speeds

[0377] According to formula (11) to formula (16), the speed direction is determined and the positive and negative pass speeds are corrected. After correction, all speeds are positive for the 1st, 3rd, 5th and 7th passes, and negative for the 2nd and 4th passes.

[0378] The final calculated values ​​and parameters of flat roll rolling speed, flat roll biting speed, roller table rolling speed, roller table biting speed, vertical roll rolling speed, vertical roll biting speed are summarized in the following table:

[0379]

[0380]

[0381] Embodiment 4:

[0382] This embodiment rolls 400 series stainless steel, steel type: SUS430; steel 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 adopts 5 passes, and the speed of each part of the rough rolling is calculated as follows:

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

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

[0386]

[0387] According to formula (1), the rolling speed of each pass of flat roll 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] Rough rolling work roll diameter: 1128.4mm;

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

[0396]

[0397] According to formula (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 rolling speed and steel biting speed between the flat roll and the vertical roll

[0414] The forward and backward slip values ​​of the flat rollers in each pass are as follows:

[0415]

[0416] (1) Calculation of odd-pass roller speed

[0417] According to Table 3, the roller correction coefficient corr_roll is 0.02. According to formula (3) and formula (4), the roller rolling

[0418] The calculation of the braking speed and the steel biting speed is as follows:

[0419] v_roll(1)=v(1)*bslip(1)*(1-corr_roll)=2.70*0.8*(1-0.02)=2.12(m / s)

[0420] v0_roll(1)=v0(1)*bslip(1)*(1-corr_roll)=1.84*0.8*(1-0.02)=1.44(m / s)

[0421] v_roll(3)=v(3)*bslip(3)*(1-corr_roll)=3.80*0.762*(1-0.02)=2.84(m / s)

[0422] v0_roll(3)=v0(3)*bslip(3)*(1-corr_roll)=2.73*0.762*(1-0.02)=2.04(m / s)

[0423] v_roll(5)=v(5)*bslip(5)*(1-corr_roll)=4.90*0.738*(1-0.02)=3.54(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) Calculation of roller speed for even passes

[0426] According to formula (5) and formula (6), the rolling speed and steel biting speed of each pass are calculated 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 vertical roller rolling speed and steel biting speed

[0432] (1) Calculation of odd-order vertical roller speed

[0433] According to Table 4, the correction coefficient corr_E of the vertical roller is 0.016. According to formula (7) and formula (8), the vertical roller rolling of odd passes

[0434] The calculation of the braking speed and the steel biting speed is as follows:

[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) Calculation of vertical roller speed for even passes

[0448] According to formula (9) and formula (10), the rolling speed and steel biting speed of each pass of the even pass are 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(ms / )

[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(ms / )

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

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

[0459] The final calculated values ​​and parameters of flat roll rolling speed, flat roll biting speed, roller table rolling speed, roller table biting speed, vertical roll rolling speed, vertical roll biting speed are summarized in the following table:

[0460]

[0461] The speeds are controlled according to the above precise calculations, and the strip rolling is stable without slipping, scratches or other surface defects.

[0462] Embodiment 5:

[0463] This embodiment rolls high magnetic induction oriented silicon steel, steel type: DQ03; steel coil number: 94B425001, billet thickness 222mm, billet width 1057mm; rough rolling target thickness 47mm, target temperature 1000°C; 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 rolling speed of each flat roll

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

[0467]

[0468] According to formula (1), the rolling speed of each pass of flat roll 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 roller biting speed of each pass

[0475] Rough rolling work roll diameter: 1132.2mm;

[0476] The calculated values ​​of rolling speed, inlet temperature and reduction for each pass are as follows:

[0477]

[0478] According to formula (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 rolling speed and steel biting speed between the flat roll and the vertical roll

[0495] The forward and backward slip values ​​of the flat rollers in each pass are as follows:

[0496]

[0497] (1) Calculation of odd-pass roller speed

[0498] According to Table 3, the roller correction coefficient corr_roll is 0.035. According to formula (3) and formula (4), the roller rolling

[0499] The calculation of the braking speed and the steel biting speed is 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) Calculation of roller speed for even passes

[0507] According to formula (5) and formula (6), the rolling speed and steel biting speed of each pass are 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 vertical roller rolling speed and steel biting speed

[0513] (1) Calculation of odd-order vertical roller speed

[0514] According to Table 4, the correction coefficient corr_E of the vertical roller is 0.028. According to formula (7) and formula (8), the vertical roller rolling of odd passes

[0515] The calculation of the braking speed and the steel biting speed is as follows:

[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(ms / )

[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(ms / )

[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(ms / )

[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) Calculation of vertical roller speed for even passes

[0529] According to formula (9) and formula (10), the rolling speed and steel biting speed of each pass of the even pass are 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(ms / )

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

[0539] According to formula (11) to formula (16), the speed direction is determined and the positive and negative pass speeds are corrected. After correction, all speeds are positive for the 1st, 3rd, 5th and 7th passes, and negative for the 2nd and 4th passes.

[0540] The final calculated values ​​and parameters of flat roll rolling speed, flat roll biting speed, roller table rolling speed, roller table biting speed, vertical roll rolling speed, vertical roll biting speed are summarized in the following table:

[0541]

[0542]

[0543] The speeds are controlled according to the above precise calculations, and the strip rolling is stable without slipping, scratches or other surface defects.

[0544] Embodiment 6:

[0545] This embodiment rolls titanium plates, steel type: TA1; steel coil number: 949157101, billet thickness 199 mm, billet width 1292 mm; rough rolling target thickness 35 mm, target temperature 750° C.; finished product thickness 4.1 mm, finished product width target 1302 mm.

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

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

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

[0549]

[0550] According to formula (1), the rolling speed of each pass of flat roll 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 roller biting speed of each pass

[0559] Rough rolling work roll diameter: 1133.9mm;

[0560] The calculated values ​​of rolling speed, inlet temperature and reduction for each pass are 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 rolling speed and steel biting speed between the flat roll and the vertical roll

[0585] The forward and backward slip values ​​of the flat rollers in each pass are as follows:

[0586]

[0587] (1) Calculation of odd-pass roller speed

[0588] According to Table 3, the roller correction coefficient corr_roll is 0.01. According to formula (3) and formula (4), the roller rolling

[0589] The calculation of the braking speed and the steel biting speed is as follows:

[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) Calculation of roller speed for even passes

[0599] According to formula (5) and formula (6), the rolling speed and steel biting speed of each pass are 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 vertical roller rolling speed and steel biting speed

[0607] (1) Calculation of odd-order vertical roller speed

[0608] According to Table 4, the correction coefficient corr_E of the vertical roller is 0.008. According to formula (7) and formula (8), the vertical roller rolling of odd passes

[0609] The calculation of the braking speed and the steel biting speed is as follows:

[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(ms / )

[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(ms / )

[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(ms / )

[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(ms / )

[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(ms / )

[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(ms / )

[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) Calculation of vertical roller speed for even passes

[0627] According to formula (9) and formula (10), the rolling speed and steel biting speed of each pass of the even pass are 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 and correct the forward and reverse speeds

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

[0642] The final calculated values ​​and parameters of flat roll rolling speed, flat roll biting speed, roller table rolling speed, roller table biting speed, vertical roll rolling speed, vertical roll biting speed are summarized in the following table:

[0643]

[0644] The speeds are controlled according to the above precise calculations, and the strip rolling is stable without slipping, scratches or other surface defects.

[0645] In this application, the formulas for calculating the flat roll rolling speed and the flat roll biting speed of each pass, the formulas for calculating the roller rolling speed and the roller biting speed of each pass, and the formulas for calculating the vertical roll rolling speed and the vertical roll biting speed of each pass are empirical formulas summarized after the rolling test of various types of steel in the 1450mm hot rolling production line. This application summarizes the relationship between the flat roll rolling speed, the flat roll biting speed and the vertical roll rolling speed and the vertical roll biting speed in the rough rolling of the 1450mm hot rolling production line, and realizes that the running speeds of the flat rolls and the vertical rolls are adapted to each other during the rough rolling process, thereby reducing the defective rate during rolling.

[0646] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0647] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A rolling method for accurately controlling the speed of a roughing mill, suitable for a 1450mm hot rolling production line, characterized in that: The rolling method for accurately controlling the speed of the roughing mill unit comprises: Determine the type of steel to be rolled; Calculate the flat roll rolling speed of each pass in the rough rolling work according to the type of steel; Calculate the flat roll biting speed of each pass in the rough rolling process according to the type of steel; Calculate the roller rolling speed and roller bite speed between the vertical roller and the flat roller according to the type of steel, the flat roller rolling speed and the flat roller bite speed in each pass; The vertical roll rolling speed and the vertical roll biting speed are calculated according to the steel type, the flat roll rolling speed and the flat roll biting speed in each pass.

2. The rolling method for accurately controlling the speed of the roughing mill according to claim 1, characterized in that: The rolling method for accurately controlling the speed of the roughing mill unit further comprises: modifying the flat roll rolling speed, the flat roll biting speed, the roller table rolling speed, the roller table biting speed, the vertical roll rolling speed and the vertical roll biting speed according to the rolling direction of each pass; 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 formula, i represents the current pass number in each pass, ranging from 1 to 7, odd passes are forward rolling, and even passes are reverse rolling; 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 roll rolling speed, flat roll biting speed, roller table rolling speed, roller table biting speed, vertical roll rolling speed, vertical roll biting speed values; v(i), v0(i), v_roll(i), v0_roll(i), v_E(i), and v0_E(i) represent the current pass flat roll rolling speed, Calculate the absolute value of flat roll biting speed, roller table rolling speed, roller table biting speed, vertical roll rolling speed, and vertical roll biting speed.

3. The rolling method for accurately controlling the speed of the roughing mill according to claim 2, characterized in that: The method for calculating the flat roll rolling speed of each pass in the rough rolling work according to the steel type includes: The specific calculation is as follows: v(i)=kvv0+i*kvv1 / (passno+coff)+add_coff Where i represents the current track number, ranging from 1 to 7; v(i) represents the rolling speed of the i-th pass; kvv0 represents a constant term, with a value of 2.2; kvv1 represents the pass coefficient, which takes a value of 2.5; passno indicates the total number of rolling passes. For example, if there are 5 rolling passes, the value is 5; if there are 7 rolling passes, the value is 7. coff is the pass coefficient, which is mainly used for speed compensation calculation of certain steel grades in 7 passes. It is related to the pass, steel grade, thickness and width. The specific value is given in Table 1; add_coff is an additional coefficient, which is related to the number of passes, steel type, and pass order. The specific value is given in Table 2; Table 1 Pass coefficient coff value table Table 2 Additional coefficient add_coff value table 4. The rolling method for accurately controlling the speed of the roughing mill according to claim 3, characterized in that: The method for calculating the flat roll biting speed of each pass in the rough rolling process according to the steel type includes: v0(i)=v(i)*(0.85-0.0005*en_temp(i)*sqrt(d / 2*red(i)) / (d / 2-red(i) / 2)) Where i represents the current track number, ranging from 1 to 7; v0(i) represents the flat roller biting speed in the i-th pass, unit: m / s; v(i) represents the rolling speed of the flat roll in the i-th pass, unit: m / s; 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, unit: °C; red(i) represents the reduction of the i-th pass, unit: mm; d represents the working roll diameter, unit: mm.

5. The rolling method for accurately controlling the speed of the roughing mill according to claim 4, characterized in that: The method for calculating the roller rolling speed between the vertical roller and the flat roller and the roller biting speed comprises: The rolling speed of odd and secondary rollers and the roller bite speed are as follows: v_roll(i)=v(i)*bslip(i)*(1-corr_roll) v0_roll(i)=v0(i)*bslip(i)*(1-corr_roll) Where i represents the current track number, ranging from 1 to 7; v_roll(i) and v0_roll(i) represent the rolling speed and the steel biting speed of the roller in the i-th pass, respectively, in m / s; v(i) and v0(i) represent the rolling speed and the flat roll biting speed of the i-th pass, in m / s; bslip(i) represents the back slip coefficient of the flat roller in the i-th pass; corr_roll represents the roller correction coefficient, which is related to the steel type; the specific value is shown in Table 3; Table 3 Roller correction coefficient corr_roll value table The even-pass roller rolling speed and roller bite speed 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) Where i represents the current track number, ranging from 1 to 7; v_roll(i) and v0_roll(i) represent the rolling speed and the steel biting speed of the roller in the i-th pass, respectively, in m / s; v(i) and v0(i) represent the rolling speed and the flat roll biting speed of the i-th pass, in m / s; fslip(i) represents the forward slip coefficient of the flat roller in the i-th pass; corr_roll represents the roller correction coefficient, which is related to the steel type; the specific value is taken from Table 3.

6. The rolling method for accurately controlling the speed of the roughing mill according to claim 5, characterized in that: The method for calculating the vertical roller rolling speed and the vertical roller biting speed comprises: The calculation of odd-pass vertical roller rolling speed and vertical roller biting speed is 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) Where i represents the current track number, ranging from 1 to 7; v_E(i) and v0_E(i) represent the rolling speed of the vertical roller and the steel biting speed of the vertical roller in the i-th pass, respectively, in m / s; v(i) and v0(i) represent the rolling speed and the flat roll biting speed of the i-th pass, in m / s; bslip(i) represents the back slip coefficient of the flat roller in the i-th pass; corr_roll represents the roller correction coefficient, which is related to the steel type; the specific value is taken from Table 3; corr_E represents the correction coefficient of the vertical roller, which is related to the steel type; the specific value is shown in Table 4; Table 4 Vertical Roller Correction Factor corr_E Value Table The calculation of the even-pass vertical roller rolling speed and the vertical roller biting speed is 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) Where i represents the current track number, ranging from 1 to 7; v_E(i) and v0_E(i) represent the rolling speed of the vertical roller and the steel biting speed of the vertical roller in the i-th pass, respectively, in m / s; v(i) and v0(i) represent the rolling speed and the flat roll biting speed of the i-th pass, in m / s; fslip(i) represents the forward slip coefficient of the flat roller in the i-th pass; corr_roll represents the roller correction coefficient, which is related to the steel type; the specific value is taken from Table 3; corr_E represents the correction coefficient of the vertical roller, which is related to the type of steel; the specific value is taken from Table 4.

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