Forward and backward sliding control method for finishing mill group

Abstract

The invention discloses a forward and backward slip control method for a finishing mill group, which comprises the following steps of: processing the reduction rate of each rack corresponding to strip steel to be subjected to finish rolling to obtain an influence coefficient of the reduction rate on forward slip; the inlet thickness and the roller diameter of each rack corresponding to the strip steel to be subjected to finish rolling are processed, and the influence coefficient of the roller diameter on forward slip is obtained; the influence coefficient of the reduction rate on forward slip and the influence coefficient of the roller diameter on forward slip are processed, and the forward slip coefficient of each rack is obtained; processing the forward slip coefficient of each rack to obtain a backward slip coefficient of each rack; the outlet speed of the finish rolling last rack and the forward slip coefficient and the backward slip coefficient of each rack are processed, and the speed of each rack is obtained; the backward slip coefficient of the finish rolling first rack is corrected; and the corrected backward slip coefficient of the finish rolling first rack is processed, and the inlet speed of the finish rolling first rack and the roller way speed before finish rolling are obtained. The rolling stability between the racks can be improved, and the waist collapse phenomenon of soft steel in front of a finishing mill is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of steel rolling, and in particular to a forward and backward sliding control method of a finishing mill group. Background Art

[0002] refer to Figure 1 The existing 1549mm hot rolling production line includes a furnace area, a rough rolling area, a finishing rolling area, a laminar cooling area and a coiling area arranged in sequence. The furnace area includes 4 heating furnaces arranged in sequence. The rough rolling area includes a high-pressure water descaling box, a rough rolling vertical roll mill (VE0), a rough rolling flat roll mill (R0) and an insulation cover arranged in sequence. The finishing rolling area includes a rotary drum head shear, a 7-stand finishing mill (F0~F6 stands), a convexity meter and a flatness meter, as well as a width gauge and a thickness gauge arranged in sequence. The laminar cooling area is arranged with laminar cooling equipment, and the coiling area is arranged with two coilers (C1, C2). The main production process of the 1549mm hot rolling production line is that 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 rough rolling flat roll controls the thickness. Reversible rolling is carried out in the rough rolling unit, generally for 5 to 7 passes; after rolling in the rough rolling unit, the strip reaches the preset target thickness, width and temperature, and then enters the finishing rolling unit for seven-stand flat roll continuous rolling, so that the strip reaches the preset target thickness, temperature, convexity and flatness; then the strip is controlled by laminar cooling to reach the target coiling temperature; finally, the strip is formed into a coil by a coiler.

[0003] The finishing mill adopts seven-stand continuous rolling. During the seven-stand continuous rolling process, ensuring the equal second flow rate between each stand is the most basic and critical link for stable continuous rolling. Only when the second flow rate between each stand is equal can the flow sleeve between stands be stable and the rolling accuracy can meet the requirements.

[0004] In the seven-stand continuous rolling process, the equal flow rate per second between each stand means that the flow rate of the strip cross section passing through each stand per unit time is the same. The specific calculation formula of the flow rate per second is flow rate per second = thickness * width * speed. Since the width of each stand of the finishing mill is approximately equal, the flow rate per second between each stand can be guaranteed to be equal when the inlet thickness, outlet thickness, inlet speed and outlet speed of the stand meet the following relationship:

[0005] then(i)*v en (i) = then(i+1)*v ex (i) = then(i+1)*v en (i+1)=then(i+2)*v ex (i+1);

[0006] Where i represents the rack number, then(i) represents the inlet thickness of the i-th rack, v en (i) represents the inlet velocity of the i-th rack, then (i+1) represents the inlet thickness of the i+1-th rack, v ex (i) represents the exit speed of the i-th rack, v en (i+1) represents the inlet velocity of the i+1th rack, then (i+2) represents the inlet thickness of the i+2th rack, v ex (i+1) represents the exit speed of the i-th rack.

[0007] Since the temperature drop between the outlet of the i-th rack and the inlet of the i+1-th rack is very small, it is generally believed that the outlet thickness of the i-th rack is equal to the inlet thickness of the i+1-th rack, so the outlet velocity of the i-th rack is equal to the inlet velocity of the i+1-th rack, that is, v ex (i) = v en (i+1).

[0008] In the seven-stand continuous rolling process, based on the definition of forward slip, the forward slip coefficient of the stand and the speed of the stand satisfy the following relationship:

[0009] v ex (i) = v(i)*fslip(i);

[0010] Among them, i represents the rack number, v ex (i) represents the exit speed of the ith stand, v(i) represents the rolling speed of the ith stand, and fslip(i) represents the forward slip coefficient of the ith stand.

[0011] Based on the definition of backslip, the backslip coefficient of the rack and the speed of the rack satisfy the following relationship:

[0012] v en (i) = v(i)*bslip(i);

[0013] Among them, i represents the rack number, v en (i) represents the inlet speed of the ith stand, v(i) represents the rolling speed of the ith stand, and bslip(i) represents the backslip coefficient of the ith stand.

[0014] At the same time, since the second traffic between racks is equal, then(i)*v en (i) = then(i+1)*v ex (i) Therefore, when the second flow rates between racks are equal, the forward slip coefficient and the backward slip coefficient of the racks satisfy the following relationship:

[0015] bslip(i)=then(i+1)*fslip(i) / then(i).

[0016] At present, when finishing rolling is carried out, the forward slip coefficient of each finishing rolling stand is first determined according to the parameters of the finishing strip, and then based on the determined forward slip coefficient of each finishing rolling stand, the predetermined outlet speed of the last finishing rolling stand, the inlet thickness and outlet thickness of each finishing rolling stand, the relationship satisfied when the second flow rate between each stand is equal, the relationship between the forward slip coefficient of the stand and the speed of the stand, and the relationship between the backward slip coefficient of the stand and the speed of the stand are used to perform calculations and determine the inlet speed, rolling speed and outlet speed of each finishing rolling stand.

[0017] At present, for seven-stand continuous rolling, the forward slip coefficient of each stand is given according to experience. Specifically, according to the roller diameter and the reduction rate range, the process personnel give the corresponding forward slip coefficients in different ranges. After determining the forward slip coefficient, the rear slip coefficient is determined according to the relationship between the forward slip coefficient and the rear slip coefficient when the second flow rate between each stand is equal.

[0018] However, since the accuracy of the forward slip coefficient and the backward slip coefficient will directly affect the calculation accuracy of the entrance speed, rolling speed and exit speed of each finishing stand, when the forward slip coefficient and the backward slip coefficient are taken in a range value method, the accuracy of the forward slip coefficient and the backward slip coefficient of each stand cannot be guaranteed. When the values ​​of the forward slip coefficient and the backward slip coefficient of each stand have large deviations, the calculated entrance speed, rolling speed and exit speed of each finishing stand will also have large deviations, thereby causing the mismatch of the second flow rate between the stands. When the second flow rate between the stands does not match, it will cause loop abnormalities and even scrap steel failures. In addition, when the forward slip coefficient and the backward slip coefficient are taken in a range value method, the characteristics of different steel grades are not taken into account. When rolling soft material steel, it is easy for the soft material steel to collapse between the front roller of the finishing mill and the finishing mill, thereby causing scratches on the lower surface of the strip. Summary of the invention

[0019] In order to solve part or all of the technical problems existing in the above-mentioned prior art, the present invention provides a method for controlling forward and backward sliding of a finishing mill.

[0020] The technical solution of the present invention is as follows:

[0021] A method for controlling forward and backward sliding of a finishing mill group is provided, the method comprising:

[0022] Using the preset first influence coefficient calculation model, the reduction rate of each stand corresponding to the finished strip is calculated and processed to obtain the influence coefficient of the reduction rate on the forward slip;

[0023] Using the preset second influence coefficient calculation model, the inlet thickness and roll diameter of each stand corresponding to the finished strip are calculated and processed to obtain the influence coefficient of the roll diameter on the forward slip;

[0024] Using the preset forward slip coefficient calculation model, the influence coefficient of the reduction rate on the forward slip and the influence coefficient of the roll diameter on the forward slip are calculated and processed to obtain the forward slip coefficient of each stand;

[0025] Using a preset relationship model between the forward slip coefficient and the backward slip coefficient, the forward slip coefficient of each rack is calculated and processed to obtain the backward slip coefficient of each rack;

[0026] By using the preset relationship model between the forward slip coefficient and the rack speed, the relationship model between the backward slip coefficient and the rack speed, and the relationship model between the exit speed of the front rack and the entrance speed of the rear rack, the exit speed of the final stand of the finishing rolling mill, the forward slip coefficient and the backward slip coefficient of each stand are calculated and processed to obtain the entrance speed, rolling speed and exit speed of each stand;

[0027] By using the preset backslip correction coefficients of different steel grades and the preset backslip correction model of the first finishing stand, the backslip coefficient of the first finishing stand is calculated and processed to obtain the corrected backslip coefficient of the first finishing stand;

[0028] By using the preset relationship model between the backslip coefficient and the stand speed, the backslip coefficient of the first stand of the finishing rolling mill after the correction is calculated and processed to obtain the inlet speed of the first stand of the finishing rolling mill;

[0029] By using the preset relationship model between the roller speed before finishing and the inlet speed of the first finishing stand, the inlet speed of the first finishing stand is calculated to obtain the roller speed before finishing.

[0030] In some optional implementations, the first influence coefficient calculation model expression is:

[0031] flsip eps (i)=((((e5*eps(i)+e4)*eps(i)+e3)*eps(i)+e2)*eps(i)+e1)*eps(i)+e0;

[0032] Among them, i represents the rack number identification, flsip eps (i) represents the influence coefficient of the reduction rate corresponding to the i-th rack on the forward sliding, eps(i) represents the reduction rate of the i-th rack, and e5, e4, e3, e2, e1 and e0 represent the reduction rate coefficients.

[0033] In some optional embodiments, the reduction rate coefficient is set to:

[0034] Coefficient name e5 e4 e3 e2 e1 e0 Coefficient value 7.42 -10.841 4.901 -0.8848 0.3318 0 .

[0035] In some optional implementations, the second influence coefficient calculation model expression is:

[0036] flsip roll (i)=((((r5*coff(i)+r4)*coff(i)+r3)*coff(i)+r2)*coff(i)+r1)*coff(i)+r0;

[0037] Among them, i represents the rack number identification, flsip roll (i) represents the influence coefficient of the roller diameter corresponding to the i-th stand on the forward slip, r5, r4, r3, r2, r1 and r0 represent the roller diameter coefficients, coff(i) represents the intermediate calculation coefficient corresponding to the i-th stand, and the intermediate calculation coefficient coff(i) is expressed as:

[0038] coff(i)=sqrt(dia(i) / (2*then(i)));

[0039] Where i is the rack number, dia(i) is the roll diameter of the i-th rack, then(i) is the inlet thickness of the i-th rack, and sqrt is the square root calculation.

[0040] In some optional embodiments, the roller diameter coefficient is set to:

[0041] Coefficient name r5 r4 r3 r2 r1 r0 Coefficient value 0.00000471 -0.0002553 0.0053778 -0.05624 0.31057 0.21879 .

[0042] In some optional implementations, the forward slip coefficient calculation model expression is:

[0043] fslip(i)=1+0.92*flsip eps (i)*flsip roll (i);

[0044] Where i represents the rack number, fslip(i) represents the forward slip coefficient of the i-th rack, and flsip eps (i) represents the influence coefficient of the depression rate corresponding to the i-th rack on the forward sliding, flsip roll (i) represents the influence coefficient of the roll diameter corresponding to the i-th stand on the forward slip.

[0045] In some optional implementations, the relationship model expression between the forward sliding coefficient and the backward sliding coefficient is:

[0046] bslip(i)=then(i+1)*fslip(i) / then(i);

[0047] Among them, i represents the rack number identification, bslip(i) represents the back slip coefficient of the i-th rack, fslip(i) represents the front slip coefficient of the i-th rack, then(i+1) represents the entrance thickness of the i+1-th rack, and then(i) represents the entrance thickness of the i-th rack.

[0048] In some optional implementations, the relationship model expression between the forward slip coefficient and the rack speed is:

[0049] v(i)=v ex (i) / fslip(i);

[0050] The relationship model expression between the backslip coefficient and the rack speed is:

[0051] v en (i) = v(i)*bslip(i);

[0052] The relationship model expression between the outlet speed of the front rack and the inlet speed of the rear rack is:

[0053] v ex (i) = v en (i+1);

[0054] Where i represents the rack number, v(i) represents the rolling speed of the i-th rack, and v ex (i) represents the exit speed of the i-th rack, fslip(i) represents the forward slip coefficient of the i-th rack, v en (i) represents the inlet velocity of the i-th rack, bslip(i) represents the backslip coefficient of the i-th rack, v en (i+1) represents the inlet velocity of the i+1th rack.

[0055] In some optional embodiments, the backslip correction coefficients for different steel grades are set as:

[0056]

[0057] Wherein, when the value of the backslip correction coefficient is a range value, the value of the backslip correction coefficient includes the lower boundary value and does not include the upper boundary value;

[0058] The correction model expression of the back slip coefficient of the first stand of finishing rolling is:

[0059] bslip1(1)=bslip(1)*(1+corr);

[0060] Wherein, bslip1(1) represents the backslip coefficient of the first stand of the finishing mill after correction, bslip(1) represents the backslip coefficient of the first stand of the finishing mill before correction, and corr represents the backslip correction coefficient.

[0061] In some optional embodiments, the relationship model expression between the roller speed before finishing rolling and the inlet speed of the first finishing rolling stand is:

[0062] v roll =v en (1);

[0063] Among them, v roll Indicates the roller speed before finishing rolling, v en (1) Indicates the inlet speed of the first stand of finishing mill.

[0064] The main advantages of the technical solution of the present invention are as follows:

[0065] The front and rear slip control method of the finishing mill group of the present invention calculates the front slip coefficient and the rear slip coefficient of each frame according to the specific values ​​of the reduction rate, entrance thickness and roller diameter of each frame during finishing rolling, and calculates the speed of each frame according to the specific values ​​of the calculated front slip coefficient and rear slip coefficient of each frame, which can improve the calculation accuracy of the speed of each frame, ensure the consistency control of the second flow rate between frames, and thus improve the rolling stability between frames; in addition, the rear slip coefficient of the first finishing frame is corrected and adjusted according to the type of steel strip to be finish-rolled, and the entrance speed of the first finishing frame and the roller speed before finishing rolling are adjusted according to the corrected rear slip coefficient, which can avoid the collapse of soft steel before the finishing mill and improve the surface quality of soft steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0067] In the figure:

[0068] Figure 1 This is a schematic diagram of the equipment layout of an existing 1549mm hot rolling production line;

[0069] Figure 2 A flowchart of a method for controlling forward and backward sliding of a finishing mill group provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. 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 making creative work are within the scope of protection of the present invention.

[0071] The technical solution provided by the embodiments of the present invention is described in detail below with reference to the accompanying drawings.

[0072] refer to Figure 2 The embodiment of the present invention provides a method for controlling the forward and backward sliding of a finishing mill, which is used in a 1549mm hot rolling production line and includes the following steps:

[0073] Step 1, using a preset first influence coefficient calculation model, calculating and processing the reduction rate of each stand corresponding to the finished strip to obtain the influence coefficient of the reduction rate on the forward slip;

[0074] Step 2, using a preset second influence coefficient calculation model, calculating and processing the inlet thickness and roll diameter of each stand corresponding to the finished strip to be rolled, and obtaining the influence coefficient of the roll diameter on the forward slip;

[0075] Step 3, using a preset forward slip coefficient calculation model, calculating and processing the influence coefficient of the reduction rate on the forward slip and the influence coefficient of the roll diameter on the forward slip, and obtaining the forward slip coefficient of each stand;

[0076] Step 4, using a preset relationship model between the forward slip coefficient and the backward slip coefficient, calculating and processing the forward slip coefficient of each rack to obtain the backward slip coefficient of each rack;

[0077] Step 5, using the preset relationship model between the forward slip coefficient and the rack speed, the relationship model between the backward slip coefficient and the rack speed, and the relationship model between the exit speed of the front rack and the entrance speed of the rear rack, the exit speed of the final finishing stand, the forward slip coefficient and the backward slip coefficient of each stand are calculated and processed to obtain the entrance speed, rolling speed and exit speed of each stand;

[0078] Step 6, using the preset backslip correction coefficients of different steel grades and the preset backslip correction model of the first finishing stand, the backslip coefficient of the first finishing stand is calculated and processed to obtain a corrected backslip coefficient of the first finishing stand;

[0079] Step 7, using a preset relationship model between the backslip coefficient and the stand speed, the corrected backslip coefficient of the first stand of the finishing rolling mill is calculated and processed to obtain the inlet speed of the first stand of the finishing rolling mill;

[0080] Step 8: using the preset relationship model between the roller speed before finishing rolling and the inlet speed of the first finishing rolling stand, the inlet speed of the first finishing rolling stand is calculated and processed to obtain the roller speed before finishing rolling.

[0081] In the embodiment of the present invention, the reduction rate, inlet thickness and roll diameter of each stand, and the outlet speed of the final finishing stand are determined in advance according to the parameter information of the strip to be finished and the parameter information of the finishing mill group.

[0082] The forward and backward slip control method of the finishing mill provided in the embodiment of the present invention calculates the forward slip coefficient and the backward slip coefficient of each frame according to the specific values ​​of the reduction rate, the entrance thickness and the roller diameter of each frame during finishing rolling, and calculates the speed of each frame according to the specific values ​​of the calculated forward slip coefficient and the backward slip coefficient of each frame, which can improve the calculation accuracy of the speed of each frame, ensure the consistency control of the second flow rate between frames, and thus improve the rolling stability between frames; in addition, the backward slip coefficient of the first finishing frame is corrected and adjusted according to the type of steel strip to be finish-rolled, and the entrance speed of the first finishing frame and the roller speed before finishing rolling are adjusted according to the corrected backward slip coefficient, which can avoid the collapse of soft steel before the finishing mill and improve the surface quality of soft steel.

[0083] Further, in the embodiment of the present invention, in step 1, the first influence coefficient calculation model expression is:

[0084] flsip eps (i)=((((e5*eps(i)+e4)*eps(i)+e3)*eps(i)+e2)*eps(i)+e1)*eps(i)+e0;

[0085] Among them, i represents the rack number identification, flsip eps (i) represents the influence coefficient of the reduction rate corresponding to the i-th rack on the forward sliding, eps(i) represents the reduction rate of the i-th rack, and e5, e4, e3, e2, e1 and e0 represent the reduction rate coefficients.

[0086] In the embodiment of the present invention, the values ​​of the reduction rate coefficient are shown in the following table:

[0087] Table 1 Reduction coefficient

[0088] Coefficient name e5 e4 e3 e2 e1 e0 Coefficient value 7.42 -10.841 4.901 -0.8848 0.3318 0

[0089] Further, in the embodiment of the present invention, in step 2, the second influence coefficient calculation model expression is:

[0090] flsip roll(i)=((((r5*coff(i)+r4)*coff(i)+r3)*coff(i)+r2)*coff(i)+r1)*coff(i)+r0;

[0091] Among them, i represents the rack number identification, flsip roll (i) represents the influence coefficient of the roller diameter corresponding to the i-th stand on the forward slip, r5, r4, r3, r2, r1 and r0 represent the roller diameter coefficients, coff(i) represents the intermediate calculation coefficient corresponding to the i-th stand, and the intermediate calculation coefficient coff(i) is expressed as:

[0092] coff(i)=sqrt(dia(i) / (2*then(i)));

[0093] Where i is the rack number, dia(i) is the roll diameter of the i-th rack, then(i) is the inlet thickness of the i-th rack, and sqrt is the square root calculation.

[0094] In the embodiment of the present invention, the values ​​of the roller diameter coefficient are shown in the following table:

[0095] Table 2 Roller diameter coefficient

[0096] Coefficient name r5 r4 r3 r2 r1 r0 Coefficient value 0.00000471 -0.0002553 0.0053778 -0.05624 0.31057 0.21879

[0097] Further, in the embodiment of the present invention, in step 3, the forward slip coefficient calculation model expression is:

[0098] fslip(i)=1+0.92*flsip eps (i)*flsip roll (i);

[0099] Where i represents the rack number, fslip(i) represents the forward slip coefficient of the i-th rack, and flsip eps (i) represents the influence coefficient of the depression rate corresponding to the i-th rack on the forward sliding, flsip roll (i) represents the influence coefficient of the roll diameter corresponding to the i-th stand on the forward slip.

[0100] Further, in the embodiment of the present invention, in step 4, the relationship model expression between the forward sliding coefficient and the backward sliding coefficient is:

[0101] bslip(i)=then(i+1)*fslip(i) / then(i);

[0102] Among them, i represents the rack number identification, bslip(i) represents the back slip coefficient of the i-th rack, fslip(i) represents the front slip coefficient of the i-th rack, then(i+1) represents the entrance thickness of the i+1-th rack, and then(i) represents the entrance thickness of the i-th rack.

[0103] Further, in the embodiment of the present invention, in step 5, the relationship model expression between the forward slip coefficient and the rack speed is:

[0104] v(i)=v ex (i) / fslip(i);

[0105] The relationship model expression between the backslip coefficient and the rack speed is:

[0106] v en (i) = v(i)*bslip(i);

[0107] The relationship model expression between the outlet velocity at the front rack and the inlet velocity at the rear rack is:

[0108] v ex (i) = v en (i+1);

[0109] Where i represents the rack number, v(i) represents the rolling speed of the i-th rack, and v ex (i) represents the exit speed of the i-th rack, fslip(i) represents the forward slip coefficient of the i-th rack, v en (i) represents the inlet velocity of the i-th rack, bslip(i) represents the backslip coefficient of the i-th rack, v en (i+1) represents the inlet velocity of the i+1th rack.

[0110] Further, in the embodiment of the present invention, in step 6, the backslip correction coefficients of different steel grades are shown in the following table:

[0111] Table 3 Backslip correction coefficient

[0112]

[0113]

[0114] In Table 3, when the value of the backslip correction coefficient is a range value, the value of the backslip correction coefficient includes the lower boundary value but does not include the upper boundary value, that is, "-0.15 to -0.11" means "-0.15≤backslip correction coefficient<0.11".

[0115] The correction model expression of the back slip coefficient of the first stand of finishing rolling is:

[0116] bslip1(1)=bslip(1)*(1+corr);

[0117] Wherein, bslip1(1) represents the backslip coefficient of the first finishing stand after correction, bslip(1) represents the backslip coefficient of the first finishing stand before correction, that is, the backslip coefficient of the first stand calculated in the above step 4, and corr represents the backslip correction coefficient.

[0118] Further, in the embodiment of the present invention, the relationship model between the backslip coefficient and the rack speed in step 7 is the same as the relationship model between the backslip coefficient and the rack speed in step 5, and will not be described in detail here.

[0119] Further, in the embodiment of the present invention, in step 8, the relationship model expression between the roller speed before finishing and the inlet speed of the first finishing stand is:

[0120] v roll =v en (1);

[0121] Among them, v roll Indicates the roller speed before finishing rolling, v en (1) represents the inlet speed of the first stand of the finishing mill, that is, the inlet speed of the first stand.

[0122] In the embodiment of the present invention, by adjusting the roller speed before finishing rolling, the tension between the roller and the first frame of finishing rolling can be adjusted, thereby preventing the soft material strip from collapsing during finishing rolling and causing scratches on the lower surface.

[0123] To make the above technical solution of the present invention clearer, the technical solution of the present invention will be described clearly and completely in combination with the specific embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0124] Example 1

[0125] This embodiment rolls ultrapure stainless steel, steel coil number: 946720301, steel grade: TTS443M; the rough rolling outlet thickness is 34.434mm, the rough rolling outlet width is 1173mm; the strip finishing target thickness is 3.265mm, the finishing target width is 1145mm, and the finishing target temperature is 900°C.

[0126] The relevant data of finishing rolling are as follows:

[0127] The exit speed of the finishing mill is 6.8m / s, and the acceleration is 0.035m / s 2 ;

[0128]

[0129]

[0130] F0~F6 represent the 1st to 7th racks.

[0131] Based on the above parameters, the forward and backward sliding control of the finishing mill is carried out through the following steps:

[0132] Step 1, using the first influence coefficient calculation model specifically set above, calculate and process the reduction ratio of each stand corresponding to the finished strip to obtain the influence coefficient of the reduction ratio on the forward slip;

[0133] The calculation process is as follows:

[0134] flsip eps (1)=((((e5*eps(1)+e4)*eps(1)+e3)*eps(1)+e2)*eps(1)+e1)*eps(1)+e0=((((7.42*37

[0135] .9%-10.841)*37.9%+4.901)*37.9%-0.8848)*37.9%+0.3318)*37.9%+0=0.099812;

[0136] flsip eps (2)=((((e5*eps(2)+e4)*eps(2)+e3)*eps(2)+e2)*eps(2)+e1)*eps(2)+e0=((((7.42*40

[0137] .2%-10.841)*40.2%+4.901)*40.2%-0.8848)*40.2%+0.3318)*40.2%+0=0.103566;

[0138] flsip eps (3)=((((e5*eps(3)+e4)*eps(3)+e3)*eps(3)+e2)*eps(3)+e1)*eps(3)+e0=((((7.42*31

[0139] .6%-10.841)*31.6%+4.901)*31.6%-0.8848)*31.6%+0.3318)*31.6%+0=0.086427;

[0140] flsip eps(4)=((((e5*eps(4)+e4)*eps(4)+e3)*eps(4)+e2)*eps(4)+e1)*eps(4)+e0=((((7.42*27

[0141] .4%-10.841)*27.4%+4.901)*27.4%-0.8848)*27.4%+0.3318)*27.4%+0=0.075659;

[0142] flsip eps (5)=((((e5*eps(5)+e4)*eps(5)+e3)*eps(5)+e2)*eps(5)+e1)*eps(5)+e0=((((7.42*22

[0143] .4%-10.841)*22.4%+4.901)*22.4%-0.8848)*22.4%+0.3318)*22.4%+0=0.061903;

[0144] flsip eps (6)=((((e5*eps(6)+e4)*eps(6)+e3)*eps(6)+e2)*eps(6)+e1)*eps(6)+e0=((((7.42*19

[0145] .7%-10.841)*19.7%+4.901)*19.7%-0.8848)*19.7%+0.3318)*19.7%+0=0.054370;

[0146] flsip eps (7)=((((e5*eps(7)+e4)*eps(7)+e3)*eps(7)+e2)*eps(7)+e1)*eps(7)+e0=((((7.42*16

[0147] .3%-10.841)*16.3%+4.901)*16.3%-0.8848)*16.3%+0.3318)*16.3%+0=0.045001.

[0148] Step 2, using the above-mentioned specifically set second influence coefficient calculation model, calculate and process the inlet thickness and roll diameter of each stand corresponding to the finished strip to obtain the influence coefficient of the roll diameter on the forward slip;

[0149] The calculation process is as follows:

[0150] memory(1)=sqrt(dia(1) / (2*then(1)))=sqrt(765.6 / (2*34.434))=3.334204;

[0151] memory(2)=sqrt(dia(2) / (2*then(2)))=sqrt(648.0 / (2*21.385))=3.892404;

[0152] memory(3)=sqrt(dia(3) / (2*then(3)))=sqrt(622.4 / (2*12.795))=4.931734;

[0153] memory(4)=sqrt(dia(4) / (2*then(4)))=sqrt(635.6 / (2*8.754))=6.025231;

[0154] memory(5)=sqrt(dia(5) / (2*then(5)))=sqrt(642.5 / (2*6.358))=7.108227;

[0155] memory(6)=sqrt(dia(6) / (2*then(6)))=sqrt(625.3 / (2*4.934))=7.960304;

[0156] memory(7)=sqrt(dia(7) / (2*then(7)))=sqrt(676.5 / (2*3.962))=9.239781;

[0157] zip roll (1)=(((((r5*memory(1)+r4)*memory(1)+r3)*memory(1)+r2)*memory(1)+r1)*memory(1)+r0=((((0.000

[0158] 00471*3.334204-0.0002553)*3.334204+0.0053778)*3.334204-0.05624)*3.334204+0.31057)*3.334204+0.21879=0.798802;

[0159] zip roll (2)=((((r5*memory(2)+r4)*memory(2)+r3)*memory(2)+r2)*memory(2)+r1)*memory(2)+r0=((((0.000

[0160] 00471*3.892404-0.0002553)*3.892404+0.0053778)*3.892404-0.05624)*3.892404+0.31057)*3.892404+0.21879=0.838323;

[0161] zip roll (3)=((((r5*memory(3)+r4)*memory(3)+r3)*memory(3)+r2)*memory(3)+r1)*memory(3)+r0=((((0.000

[0162] 00471*4.931734-0.0002553)*4.931734+0.0053778)*4.931734-0.05624)*4.931734+0.31057)*4.931734+0.21879=0.890350;

[0163] zip roll (4)=(((((r5*memory(4)+r4)*memory(4)+r3)*memory(4)+r2)*memory(4)+r1)*memory(4)+r0=((((0.000

[0164] 00471*6.025231-0.0002553)*6.025231+0.0053778)*6.025231-0.05624)*6.025231+0.31057)*6.025231+0.21879=0.925595;

[0165] zip roll (5)=(((((r5*memory(5)+r4)*memory(5)+r3)*memory(5)+r2)*memory(5)+r1)*memory(5)+r0=((((0.000

[0166] 00471*7.108227-0.0002553)*7.108227+0.0053778)*7.108227-0.05624)*7.108227+0.31057)*7.108227+0.21879=0.949932;

[0167] zip roll(6)=((((r5*coff(6)+r4)*coff(6)+r3)*coff(6)+r2)*coff(6)+r1)*coff(6)+r0=((((0.000

[0168] 00471*7.960304-0.0002553)*7.960304+0.0053778)*7.960304-0.05624)*7.960304+0.31057)*7.960304+0.21879=0.965381;

[0169] flsip roll (7)=((((r5*coff(7)+r4)*coff(7)+r3)*coff(7)+r2)*coff(7)+r1)*coff(7)+r0=((((0.000

[0170] 00471*9.239781-0.0002553)*9.239781+0.0053778)*9.239781-0.05624)*9.239781+0.31057)*9.239781+0.21879=0.985572.

[0171] Step 3, using the above-mentioned specific forward slip coefficient calculation model, calculate and process the influence coefficient of the reduction rate on the forward slip and the influence coefficient of the roll diameter on the forward slip, and obtain the forward slip coefficient of each stand;

[0172] The calculation process is as follows:

[0173] fslip(1)=1+0.92*flsip eps (1)*flsip roll (1) = 1 + 0.92 * 0.099812 * 0.798802 = 1.073352;

[0174] fslip(2)=1+0.92*flsip eps (2)*flsip roll (2) = 1 + 0.92 * 0.103566 * 0.838323 = 1.079876;

[0175] fslip(3)=1+0.92*flsip eps (3)*flsip roll (3) = 1 + 0.92 * 0.086427 * 0.890350 = 1.070794;

[0176] fslip(4)=1+0.92*flsip eps (4)*flsip roll (4) = 1 + 0.92 * 0.075659 * 0.925595 = 1.064427;

[0177] fslip(5)=1+0.92*flsip eps (5)*flsip roll (5) = 1 + 0.92 * 0.061903 * 0.949932 = 1.054099;

[0178] fslip(6)=1+0.92*flsip eps (6)*flsip roll (6) = 1 + 0.92 * 0.054370 * 0.965381 = 1.048289;

[0179] fslip(7)=1+0.92*flsip eps (7)*flsip roll (7) = 1 + 0.92 * 0.045001 * 0.985572 = 1.040804.

[0180] Step 4, using the relationship model between the forward slip coefficient and the backward slip coefficient specifically defined above, the forward slip coefficient of each rack is calculated and processed to obtain the backward slip coefficient of each rack;

[0181] The calculation process is as follows:

[0182] bslip(1)=then(2)*fslip(1) / then(1)=21.385*1.073352 / 34.434=0.666598;

[0183] bslip(2)=then(3)*fslip(2) / then(2)=12.795*1.079876 / 21.385=0.646108;

[0184] bslip(3)=then(4)*fslip(3) / then(3)=8.754*1.070794 / 12.795=0.732609;

[0185] bslip(4)=then(5)*fslip(4) / then(4)=6.358*1.064427 / 8.754=0.773090;

[0186] bslip(5)=then(6)*fslip(5) / then(5)=4.934*1.054099 / 6.358=0.818013;

[0187] bslip(6)=then(7)*fslip(6) / then(6)=3.962*1.048289 / 4.934=0.841775;

[0188] bslip(7)=then(8)*fslip(7) / then(7)=3.315*1.040804 / 3.962=0.870839;

[0189] Among them, then(8) represents the outlet thickness of the 7th rack.

[0190] Step 5, using the relationship model between the forward slip coefficient and the rack speed, the relationship model between the backward slip coefficient and the rack speed, and the relationship model between the exit speed of the front rack and the entrance speed of the rear rack, the exit speed of the final finishing stand, the forward slip coefficient and the backward slip coefficient of each stand are calculated and processed to obtain the entrance speed, rolling speed and exit speed of each stand;

[0191] The calculation process is as follows:

[0192] v(7)=v ex (7) / fslip(7)=6.8 / 1.040804=6.53(m / s);

[0193] v ex (6) = v en (7)=v(7)*bslip(7)=6.53*0.870839=5.69(m / s);

[0194] v(6)=v ex (6) / fslip(6)=5.69 / 1.048289=5.43(m / s);

[0195] v ex (5) = v en (6)=v(6)*bslip(6)=5.43*0.841775=4.57(m / s);

[0196] v(5)=v ex (5) / fslip(5)=4.57 / 1.054099=4.33(m / s);

[0197] v ex (4) = v en(5)=v(5)*bslip(5)=4.33*0.818013=3.55(m / s);

[0198] v(4)=v ex (4) / fslip(4)=3.55 / 1.064427=3.33(m / s);

[0199] v ex (3) = v en (4)=v(4)*bslip(4)=3.33*0.773090=2.58(m / s);

[0200] v(3)=v ex (3) / fslip(3)=2.58 / 1.070794=2.40(m / s);

[0201] v ex (2) = v en (3)=v(3)*bslip(3)=2.40*0.732609=1.76(m / s);

[0202] v(2)=v ex (2) / fslip(2)=1.76 / 1.079876=1.63(m / s);

[0203] v ex (1) = v en (2)=v(2)*bslip(2)=1.63*0.646108=1.05(m / s);

[0204] v(1)=v ex (1) / fslip(1)=1.05 / 1.073352=0.98(m / s);

[0205] v en (1)=v(1)*bslip(1)=0.98*0.666598=0.65(m / s).

[0206] Step 6, using the above-defined backslip correction coefficients of different steel grades and the backslip correction model of the first finishing stand, the backslip coefficient of the first finishing stand is calculated and processed to obtain a corrected backslip coefficient of the first finishing stand;

[0207] The calculation process is as follows:

[0208] Since this embodiment rolls ultrapure stainless steel, the rough rolling outlet thickness is 34.434 mm, and the finishing rolling target width is 1145 mm, the backslip correction coefficient corr is -0.1;

[0209] The corrected backslip coefficient of the first stand of finishing rolling is:

[0210] bslip1(1)=bslip(1)*(1+corr)=0.666598*(1-0.1)=0.599938.

[0211] Step 7, using the relationship model between the backslip coefficient and the stand speed specifically set above, the backslip coefficient of the first stand of the finishing rolling mill after correction is calculated and processed to obtain the inlet speed of the first stand of the finishing rolling mill;

[0212] The calculation process is as follows:

[0213] v en (1)=v(1)*bslip1(1)=0.98*0.599938=0.59(m / s).

[0214] Step 8, using the relationship model between the roller speed before finishing rolling and the inlet speed of the first finishing rolling stand specifically set above, the inlet speed of the first finishing rolling stand is calculated and processed to obtain the roller speed before finishing rolling;

[0215] The calculation process is as follows:

[0216] v roll =v en (1) = 0.59 (m / s).

[0217] According to the above steps, the final roller speed, forward slip coefficient, backward slip coefficient and speed of each frame are as follows:

[0218] frame roll F0 F1 F2 F3 F4 F5 F6 fslip 1.073352 1.079876 1.070794 1.064427 1.054099 1.048289 1.040804 bslip 0.599938 0.646108 0.732609 0.773090 0.818013 0.841775 0.870839 <![CDATA[v en ]]> 0.59 1.05 1.76 2.58 3.55 4.57 5.69 v 0.98 1.63 2.40 3.33 4.33 5.43 6.53 <![CDATA[v ex ]]> 1.05 1.76 2.58 3.55 4.57 5.69 6.80 <![CDATA[v roll ]]> 0.59

[0219] Finish rolling is carried out based on the above-determined parameters. The control between stands is stable during the rolling process, and there is no waist collapse phenomenon before finish rolling.

[0220] Example 2

[0221] This embodiment rolls 430 stainless steel, steel coil number: 944932701, steel type: SUS430FD; the rough rolling outlet thickness is 34.03mm, the rough rolling outlet width is 1064.5mm; the strip finishing target thickness is 2.85mm, the finishing target width is 1040mm, and the finishing target temperature is 940°C.

[0222] The relevant data of finishing rolling are as follows:

[0223] The exit speed of the finishing mill is 7.8m / s and the acceleration is 0.045m / s 2 ;

[0224] frame F0 F1 F2 F3 F4 F5 F6 Inlet thickness (mm) 34.03 20.53 12.25 8.05 5.56 4.11 3.31 Export thickness(mm) 20.53 12.25 8.05 5.56 4.11 3.31 2.86 Inlet temperature(℃) 977.2 968.82 961.22 953.25 945.9 938.47 929.88 Outlet temperature(℃) 968.82 961.22 953.25 945.9 938.47 929.88 918.71 Reduction rate (%) 39.7 40.3 34.3 30.9 26.2 19.5 13.4 Roller diameter (mm) 777.77 659.23 639.97 604.65 633.09 608.1 659.81

[0225] F0~F6 represent the 1st to 7th racks.

[0226] Based on the above parameters, the forward and backward sliding control of the finishing mill is carried out through the following steps:

[0227] Step 1, using the first influence coefficient calculation model specifically set above, calculate and process the reduction ratio of each stand corresponding to the finished strip to obtain the influence coefficient of the reduction ratio on the forward slip;

[0228] The calculation process is as follows:

[0229] flsip eps (1)=((((e5*eps(1)+e4)*eps(1)+e3)*eps(1)+e2)*eps(1)+e1)*eps(1)+e0=0.102809;

[0230] flsip eps (2)=((((e5*eps(2)+e4)*eps(2)+e3)*eps(2)+e2)*eps(2)+e1)*eps(2)+e0=0.103714;

[0231] flsip eps (3)=((((e5*eps(3)+e4)*eps(3)+e3)*eps(3)+e2)*eps(3)+e1)*eps(3)+e0=0.092658;

[0232] flsip eps (4)=((((e5*eps(4)+e4)*eps(4)+e3)*eps(4)+e2)*eps(4)+e1)*eps(4)+e0=0.084711;

[0233] flsip eps (5)=((((e5*eps(5)+e4)*eps(5)+e3)*eps(5)+e2)*eps(5)+e1)*eps(5)+e0=0.072416;

[0234] flsip eps (6)=((((e5*eps(6)+e4)*eps(6)+e3)*eps(6)+e2)*eps(6)+e1)*eps(6)+e0=0.053814;

[0235] flsip eps(7)=((((e5*eps(7)+e4)*eps(7)+e3)*eps(7)+e2)*eps(7)+e1)*eps(7)+e0=0.037191.

[0236] Step 2, using the above-mentioned specifically set second influence coefficient calculation model, calculate and process the inlet thickness and roll diameter of each stand corresponding to the finished strip to obtain the influence coefficient of the roll diameter on the forward slip;

[0237] The calculation process is as follows:

[0238] coff(1)=sqrt(dia(1) / (2*then(1)))=sqrt(777.77 / 2 / 34.03))=3.380490;

[0239] coff(2)=sqrt(dia(2) / (2*then(2)))=sqrt(659.23 / 2 / 20.53))=4.006905;

[0240] coff(3)=sqrt(dia(3) / (2*then(3)))=sqrt(639.97 / 2 / 12.25))=5.110893;

[0241] coff(4)=sqrt(dia(4) / (2*then(4)))=sqrt(604.65 / 2 / 8.05))=6.128287;

[0242] coff(5)=sqrt(dia(5) / (2*then(5)))=sqrt(633.09 / 2 / 5.56))=7.545366;

[0243] coff(6)=sqrt(dia(6) / (2*then(6)))=sqrt(608.1 / 2 / 4.11))=8.601052;

[0244] coff(7)=sqrt(dia(7) / (2*then(7)))=sqrt(659.81 / 2 / 3.31))=9.983446;

[0245] flsip roll (1)=((((r5*coff(1)+r4)*coff(1)+r3)*coff(1)+r2)*coff(1)+r1)*coff(1)+r0=0.802464;

[0246] flsip roll(2)=((((r5*coff(2)+r4)*coff(2)+r3)*coff(2)+r2)*coff(2)+r1)*coff(2)+r0=0.845285;

[0247] flsip roll (3)=((((r5*coff(3)+r4)*coff(3)+r3)*coff(3)+r2)*coff(3)+r1)*coff(3)+r0=0.897203;

[0248] flsip roll (4)=((((r5*coff(4)+r4)*coff(4)+r3)*coff(4)+r2)*coff(4)+r1)*coff(4)+r0=0.928251;

[0249] flsip roll (5)=((((r5*coff(5)+r4)*coff(5)+r3)*coff(5)+r2)*coff(5)+r1)*coff(5)+r0=0.958131;

[0250] flsip roll (6)=((((r5*coff(6)+r4)*coff(6)+r3)*coff(6)+r2)*coff(6)+r1)*coff(6)+r0=0.975839;

[0251] flsip roll (7)=((((r5*coff(7)+r4)*coff(7)+r3)*coff(7)+r2)*coff(7)+r1)*coff(7)+r0=0.996068.

[0252] Step 3, using the above-mentioned specific forward slip coefficient calculation model, calculate and process the influence coefficient of the reduction rate on the forward slip and the influence coefficient of the roll diameter on the forward slip, and obtain the forward slip coefficient of each stand;

[0253] The calculation process is as follows:

[0254] fslip(1)=1+0.92*flsip eps (1)*flsip roll (1) = 1 + 0.92 * 0.102809 * 0.802464 = 1.075900;

[0255] fslip(2)=1+0.92*flsip eps(2)*flsip roll (2) = 1 + 0.92 * 0.103714 * 0.845285 = 1.080654;

[0256] fslip(3)=1+0.92*flsip eps (3)*flsip roll (3) = 1 + 0.92 * 0.092658 * 0.897203 = 1.076482;

[0257] fslip(4)=1+0.92*flsip eps (4)*flsip roll (4) = 1 + 0.92 * 0.084711 * 0.928251 = 1.072342;

[0258] fslip(5)=1+0.92*flsip eps (5)*flsip roll (5) = 1 + 0.92 * 0.072416 * 0.958131 = 1.063833;

[0259] fslip(6)=1+0.92*flsip eps (6)*flsip roll (6) = 1 + 0.92 * 0.053814 * 0.975839 = 1.048313;

[0260] fslip(7)=1+0.92*flsip eps (7)*flsip roll (7) = 1 + 0.92 * 0.037191 * 0.996068 = 1.034081.

[0261] Step 4, using the relationship model between the forward slip coefficient and the backward slip coefficient specifically defined above, the forward slip coefficient of each rack is calculated and processed to obtain the backward slip coefficient of each rack;

[0262] The calculation process is as follows:

[0263] bslip(1)=then(2)*fslip(1) / then(1)=20.53*1.075900 / 34.03=0.649081;

[0264] bslip(2)=then(3)*fslip(2) / then(2)=12.25*1.080654 / 20.53=0.644813;

[0265] bslip(3)=then(4)*fslip(3) / then(3)=8.05*1.076482 / 12.25=0.707403;

[0266] bslip(4)=then(5)*fslip(4) / then(4)=5.56*1.072342 / 8.05=0.740649;

[0267] bslip(5)=then(6)*fslip(5) / then(5)=4.11*1.063833 / 5.56=0.786395;

[0268] bslip(6)=then(7)*fslip(6) / then(6)=3.31*1.048313 / 4.11=0.844261;

[0269] bslip(7)=then(8)*fslip(7) / then(7)=2.86*1.034081 / 3.31=0.893496;

[0270] Among them, then(8) represents the outlet thickness of the 7th rack.

[0271] Step 5, using the relationship model between the forward slip coefficient and the rack speed, the relationship model between the backward slip coefficient and the rack speed, and the relationship model between the exit speed of the front rack and the entrance speed of the rear rack, the exit speed of the final finishing stand, the forward slip coefficient and the backward slip coefficient of each stand are calculated and processed to obtain the entrance speed, rolling speed and exit speed of each stand;

[0272] The calculation process is as follows:

[0273] v(7)=v ex (7) / fslip(7)=7.8 / 1.034081=7.54(m / s);

[0274] v ex (6) = v en (7)=v(7)*bslip(7)=7.54*0.893496=6.74(m / s);

[0275] v(6)=v ex (6) / fslip(6)=6.74 / 1.048313=6.43(m / s);

[0276] v ex (5) = v en(6)=v(6)*bslip(6)=6.43*0.844261=5.43(m / s);

[0277] v(5)=v ex (5) / fslip(5)=5.43 / 1.063833=5.10(m / s);

[0278] v ex (4)=v en (5)=v(5)*bslip(5)=5.10*0.786395=4.01(m / s);

[0279] v(4)=v ex (4) / fslip(4)=4.01 / 1.072342=3.74(m / s);

[0280] v ex (3)=v en (4)=v(4)*bslip(4)=3.74*0.740649=2.77(m / s);

[0281] v(3)=v ex (3) / fslip(3)=2.77 / 1.076482=2.57(m / s);

[0282] v ex (2)=v en (3)=v(3)*bslip(3)=2.57*0.707403=1.82(m / s);

[0283] v(2)=v ex (2) / fslip(2)=1.82 / 1.080654=1.69(m / s);

[0284] v ex (1)=v en (2)=v(2)*bslip(2)=1.69*0.644813=1.09(m / s);

[0285] v(1)=v ex (1) / fslip(1)=1.09 / 1.075900=1.01(m / s);

[0286] v en (1)=v(1)*bslip(1)=1.01*0.649081=0.66(m / s)。

[0287] Step 6, using the above-defined backslip correction coefficients of different steel grades and the backslip correction model of the first finishing stand, the backslip coefficient of the first finishing stand is calculated and processed to obtain a corrected backslip coefficient of the first finishing stand;

[0288] The calculation process is as follows:

[0289] Since this embodiment rolls 430 stainless steel, the strip rough rolling outlet thickness is 34.03 mm, and the finishing rolling target width is 1040 mm, so the backslip correction coefficient corr is -0.08;

[0290] The corrected backslip coefficient of the first stand of finishing rolling is:

[0291] bslip1(1)=bslip(1)*(1+corr)=0.649081*(1-0.08)=0.597155.

[0292] Step 7, using the relationship model between the backslip coefficient and the stand speed specifically set above, the backslip coefficient of the first stand of the finishing rolling mill after correction is calculated and processed to obtain the inlet speed of the first stand of the finishing rolling mill;

[0293] The calculation process is as follows:

[0294] v en (1)=v(1)*bslip1(1)=1.01*0.597155=0.60(m / s).

[0295] Step 8, using the relationship model between the roller speed before finishing rolling and the inlet speed of the first finishing rolling stand specifically set above, the inlet speed of the first finishing rolling stand is calculated and processed to obtain the roller speed before finishing rolling;

[0296] The calculation process is as follows:

[0297] v roll =v en (1) = 0.60 (m / s).

[0298] According to the above steps, the final roller speed, forward slip coefficient, backward slip coefficient and speed of each frame are as follows:

[0299] frame roll F0 F1 F2 F3 F4 F5 F6 fslip 1.075900 1.080654 1.076482 1.072342 1.063833 1.048313 1.034081 bslip 0.597155 0.644813 0.707403 0.740649 0.786395 0.844261 0.893496 <![CDATA[v en ]]> 0.60 1.09 1.82 2.77 4.01 5.43 6.74 v 1.01 1.69 2.57 3.74 5.10 6.43 7.54 <![CDATA[v ex ]]> 1.09 1.82 2.77 4.01 5.43 6.74 7.80 <![CDATA[v roll ]]> 0.60

[0300] Finish rolling is carried out based on the above-determined parameters. The control between stands is stable during the rolling process, and there is no waist collapse phenomenon before finish rolling.

[0301] Example 3

[0302] This embodiment rolls 400 series stainless steel, steel coil number: 945835201, steel grade: 0CR13R; the rough rolling outlet thickness is 35.6mm, the rough rolling outlet width is 1282.1mm; the strip finishing target thickness is 4.0mm, the finishing target width is 1255mm, and the finishing target temperature is 920℃.

[0303] The relevant data of finishing rolling are as follows:

[0304] The exit speed of the finishing mill is 6.8m / s and the acceleration is 0.042m / s 2 ;

[0305]

[0306]

[0307] F0~F6 represent the 1st to 7th racks.

[0308] Based on the above parameters, the forward and backward sliding control of the finishing mill is carried out through the following steps:

[0309] Step 1, using the first influence coefficient calculation model specifically set above, calculate and process the reduction ratio of each stand corresponding to the finished strip to obtain the influence coefficient of the reduction ratio on the forward slip;

[0310] The calculation process is as follows:

[0311] flsip eps (1)=((((e5*eps(1)+e4)*eps(1)+e3)*eps(1)+e2)*eps(1)+e1)*eps(1)+e0=0.094371;

[0312] flsip eps (2)=((((e5*eps(2)+e4)*eps(2)+e3)*eps(2)+e2)*eps(2)+e1)*eps(2)+e0=0.092876;

[0313] flsip eps (3)=((((e5*eps(3)+e4)*eps(3)+e3)*eps(3)+e2)*eps(3)+e1)*eps(3)+e0=0.084214;

[0314] flsip eps (4)=((((e5*eps(4)+e4)*eps(4)+e3)*eps(4)+e2)*eps(4)+e1)*eps(4)+e0=0.072688;

[0315] flsip eps (5)=((((e5*eps(5)+e4)*eps(5)+e3)*eps(5)+e2)*eps(5)+e1)*eps(5)+e0=0.061344;

[0316] flsip eps (6)=((((e5*eps(6)+e4)*eps(6)+e3)*eps(6)+e2)*eps(6)+e1)*eps(6)+e0=0.054370;

[0317] flsip eps (7)=((((e5*eps(7)+e4)*eps(7)+e3)*eps(7)+e2)*eps(7)+e1)*eps(7)+e0=0.044457.

[0318] Step 2, using the above-mentioned specifically set second influence coefficient calculation model, calculate and process the inlet thickness and roll diameter of each stand corresponding to the finished strip to obtain the influence coefficient of the roll diameter on the forward slip;

[0319] The calculation process is as follows:

[0320] coff(1)=sqrt(dia(1) / (2*then(1)))=sqrt(772.85 / 2 / 35.6))=3.294637;

[0321] coff(2)=sqrt(dia(2) / (2*then(2)))=sqrt(677.4 / 2 / 23.11))=3.828315;

[0322] coff(3)=sqrt(dia(3) / (2*then(3)))=sqrt(623.98 / 2 / 15.16))=4.536498;

[0323] coff(4)=sqrt(dia(4) / (2*then(4)))=sqrt(652.31 / 2 / 10.5))=5.573364;

[0324] coff(5)=sqrt(dia(5) / (2*then(5)))=sqrt(635.2 / 2 / 7.73))=6.409889;

[0325] coff(6)=sqrt(dia(6) / (2*then(6)))=sqrt(606 / 2 / 6.02))=7.094521;

[0326] memory(7)=sqrt(dia(7) / (2*then(7)))=sqrt(663.3 / 2 / 4.83))=8.286410;

[0327] zip roll (1)=((((r5*memory(1)+r4)*memory(1)+r3)*memory(1)+r2)*memory(1)+r1)*memory(1)+r0=0.795610;

[0328] zip roll (2)=((((r5*memory(2)+r4)*memory(2)+r3)*memory(2)+r2)*memory(2)+r1)*memory(2)+r0=0.834268;

[0329] zip roll (3)=((((r5*memory(3)+r4)*memory(3)+r3)*memory(3)+r2)*memory(3)+r1)*memory(3)+r0=0.873277;

[0330] zip roll (4)=(((((r5*memory(4)+r4)*memory(4)+r3)*memory(4)+r2)*memory(4)+r1)*memory(4)+r0=0.912773;

[0331] zip roll (5)=(((((r5*memory(5)+r4)*memory(5)+r3)*memory(5)+r2)*memory(5)+r1)*memory(5)+r0=0.935087;

[0332] zip roll (6)=(((((r5*memory(6)+r4)*memory(6)+r3)*memory(6)+r2)*memory(6)+r1)*memory(6)+r0=0.949664;

[0333] zip roll (7)=((((r5*memory(7)+r4)*memory(7)+r3)*memory(7)+r2)*memory(7)+r1)*memory(7)+r0=0.970800。

[0334] Step 3, using the above-mentioned specific forward slip coefficient calculation model, calculate and process the influence coefficient of the reduction rate on the forward slip and the influence coefficient of the roll diameter on the forward slip, and obtain the forward slip coefficient of each stand;

[0335] The calculation process is as follows:

[0336] fslip(1)=1+0.92*flsip eps (1)*flsip roll (1) = 1 + 0.92 * 0.094371 * 0.795610 = 1.069076;

[0337] fslip(2)=1+0.92*flsip eps (2)*flsip roll (2) = 1 + 0.92 * 0.092876 * 0.834268 = 1.071285;

[0338] fslip(3)=1+0.92*flsip eps (3)*flsip roll (3) = 1 + 0.92 * 0.084214 * 0.873277 = 1.067659;

[0339] fslip(4)=1+0.92*flsip eps (4)*flsip roll (4) = 1 + 0.92 * 0.072688 * 0.912773 = 1.061040;

[0340] fslip(5)=1+0.92*flsip eps (5)*flsip roll (5) = 1 + 0.92 * 0.061344 * 0.935087 = 1.052773;

[0341] fslip(6)=1+0.92*flsip eps (6)*flsip roll (6) = 1 + 0.92 * 0.054370 * 0.949664 = 1.047502;

[0342] fslip(7)=1+0.92*flsip eps (7)*flsip roll (7) = 1 + 0.92 * 0.044457 * 0.970800 = 1.039706.

[0343] Step 4, using the relationship model between the forward slip coefficient and the backward slip coefficient specifically defined above, the forward slip coefficient of each rack is calculated and processed to obtain the backward slip coefficient of each rack;

[0344] The calculation process is as follows:

[0345] bslip(1)=then(2)*fslip(1) / then(1)=23.11*1.069076 / 35.6=0.693999;

[0346] bslip(2)=then(3)*fslip(2) / then(2)=15.16*1.071285 / 23.11=0.702755;

[0347] bslip(3)=then(4)*fslip(3) / then(3)=10.5*1.067659 / 15.16=0.739474;

[0348] bslip(4)=then(5)*fslip(4) / then(4)=7.73*1.061040 / 10.5=0.781128;

[0349] bslip(5)=then(6)*fslip(5) / then(5)=6.02*1.052773 / 7.73=0.819883;

[0350] bslip(6)=then(7)*fslip(6) / then(6)=4.83*1.047502 / 6.02=0.840438;

[0351] bslip(7)=then(8)*fslip(7) / then(7)=4.05*1.039706 / 4.83=0.871803;

[0352] Among them, then(8) represents the outlet thickness of the 7th rack.

[0353] Step 5, using the relationship model between the forward slip coefficient and the rack speed, the relationship model between the backward slip coefficient and the rack speed, and the relationship model between the exit speed of the front rack and the entrance speed of the rear rack, the exit speed of the final finishing stand, the forward slip coefficient and the backward slip coefficient of each stand are calculated and processed to obtain the entrance speed, rolling speed and exit speed of each stand;

[0354] The calculation process is as follows:

[0355] v(7)=v ex(7) / fslip(7)=6.80 / 1.039706=6.54(m / s);

[0356] v ex (6)=v en (7)=v(7)*bslip(7)=6.54*0.871803=5.70(m / s);

[0357] v(6)=v ex (6) / fslip(6)=5.70 / 1.047502=5.44(m / s);

[0358] v ex (5)=v en (6)=v(6)*bslip(6)=5.44*0.840438=4.57(m / s);

[0359] v(5)=v ex (5) / fslip(5)=4.57 / 1.052773=4.35(m / s);

[0360] v ex (4)=v en (5)=v(5)*bslip(5)=4.35*0.819883=3.56(m / s);

[0361] v(4)=v ex (4) / fslip(4)=3.56 / 1.061040=3.36(m / s);

[0362] v ex (3)=v en (4)=v(4)*bslip(4)=3.36*0.781128=2.62(m / s);

[0363] v(3)=v ex (3) / fslip(3)=2.62 / 1.067659=2.46(m / s);

[0364] v ex (2)=v en (3)=v(3)*bslip(3)=2.46*0.739474=1.82(m / s);

[0365] v(2)=v ex (2) / fslip(2)=1.82 / 1.071285=1.70(m / s);

[0366] v ex (1)=ven (2)=v(2)*bslip(2)=1.70*0.702755=1.19(m / s);

[0367] v(1)=v ex (1) / fslip(1)=1.19 / 1.069076=1.11(m / s);

[0368] v en (1)=v(1)*bslip(1)=1.11*0.693999=0.77(m / s).

[0369] Step 6, using the above-defined backslip correction coefficients of different steel grades and the backslip correction model of the first finishing stand, the backslip coefficient of the first finishing stand is calculated and processed to obtain a corrected backslip coefficient of the first finishing stand;

[0370] The calculation process is as follows:

[0371] Since this embodiment rolls 0CR13 stainless steel, the strip rough rolling outlet thickness is 35.6 mm, and the finish rolling target width is 1255 mm, so the backslip correction coefficient corr is -0.06;

[0372] The corrected backslip coefficient of the first stand of finishing rolling is:

[0373] bslip1(1)=bslip(1)*(1+corr)=0.693999*(1-0.06)=0.652359.

[0374] Step 7, using the relationship model between the backslip coefficient and the stand speed specifically set above, the backslip coefficient of the first stand of the finishing rolling mill after correction is calculated and processed to obtain the inlet speed of the first stand of the finishing rolling mill;

[0375] The calculation process is as follows:

[0376] v en (1)=v(1)*bslip1(1)=1.11*0.652359=0.73(m / s).

[0377] Step 8, using the relationship model between the roller speed before finishing rolling and the inlet speed of the first finishing rolling stand specifically set above, the inlet speed of the first finishing rolling stand is calculated and processed to obtain the roller speed before finishing rolling;

[0378] The calculation process is as follows:

[0379] v roll =v en (1) = 0.73 (m / s).

[0380] According to the above steps, the final roller speed, forward slip coefficient, backward slip coefficient and speed of each frame are as follows:

[0381] frame roll F0 F1 F2 F3 F4 F5 F6 fslip 1.069076 1.071285 1.067659 1.061040 1.052773 1.047502 1.039706 bslip 0.652359 0.702755 0.739474 0.781128 0.819883 0.840438 0.871803 <![CDATA[v en ]]> 0.73 1.19 1.82 2.62 3.56 4.57 5.70 v 1.11 1.70 2.46 3.36 4.35 5.44 6.54 <![CDATA[v ex ]]> 1.19 1.82 2.62 3.56 4.57 5.70 6.80 <![CDATA[v roll ]]> 0.73

[0382] Finish rolling is carried out based on the above-determined parameters. The control between stands is stable during the rolling process, and there is no waist collapse phenomenon before finish rolling.

[0383] Example 4

[0384] The cold rolled material in this embodiment has a steel coil number of 945216901 and a steel grade of Q195L. The rough rolling outlet thickness is 40.79 mm and the rough rolling outlet width is 1306.4 mm. The target strip thickness is 2.96 mm, the target width is 1265 mm and the target temperature is 900°C.

[0385] The relevant data of finishing rolling are as follows:

[0386] The exit speed of the finishing mill is 8.0m / s and the acceleration is 0.04m / s 2 ;

[0387] frame F0 F1 F2 F3 F4 F5 F6 Inlet thickness (mm) 40.79 22.77 13.46 8.75 6.31 4.64 3.6 Export thickness(mm) 22.77 13.46 8.75 6.31 4.64 3.6 3.02 Inlet temperature(℃) 1036.55 1021.23 968.89 955.28 940.96 926.48 912.13 Outlet temperature(℃) 1021.23 968.89 955.28 940.96 926.48 912.13 896.17 Reduction rate (%) 44.2 40.9 35 27.9 26.4 22.5 16.1 Roller diameter (mm) 773.21 660 628.24 649.56 634.9 627.51 655.25

[0388] F0~F6 represent the 1st to 7th racks.

[0389] Based on the above parameters, the forward and backward sliding control of the finishing mill is carried out through the following steps:

[0390] Step 1, using the first influence coefficient calculation model specifically set above, calculate and process the reduction ratio of each stand corresponding to the finished strip to obtain the influence coefficient of the reduction ratio on the forward slip;

[0391] The calculation process is as follows:

[0392] flsip eps (1)=((((e5*eps(1)+e4)*eps(1)+e3)*eps(1)+e2)*eps(1)+e1)*eps(1)+e0=0.108408;

[0393] flsip eps (2)=((((e5*eps(2)+e4)*eps(2)+e3)*eps(2)+e2)*eps(2)+e1)*eps(2)+e0=0.104571;

[0394] flsip eps(3)=((((e5*eps(3)+e4)*eps(3)+e3)*eps(3)+e2)*eps(3)+e1)*eps(3)+e0=0.094161;

[0395] flsip eps (4)=((((e5*eps(4)+e4)*eps(4)+e3)*eps(4)+e2)*eps(4)+e1)*eps(4)+e0=0.076992;

[0396] flsip eps (5)=((((e5*eps(5)+e4)*eps(5)+e3)*eps(5)+e2)*eps(5)+e1)*eps(5)+e0=0.072960;

[0397] flsip eps (6)=((((e5*eps(6)+e4)*eps(6)+e3)*eps(6)+e2)*eps(6)+e1)*eps(6)+e0=0.062182;

[0398] flsip eps (7)=((((e5*eps(7)+e4)*eps(7)+e3)*eps(7)+e2)*eps(7)+e1)*eps(7)+e0=0.044457.

[0399] Step 2, using the above-mentioned specifically set second influence coefficient calculation model, calculate and process the inlet thickness and roll diameter of each stand corresponding to the finished strip to obtain the influence coefficient of the roll diameter on the forward slip;

[0400] The calculation process is as follows:

[0401] coff(1)=sqrt(dia(1) / (2*then(1)))=sqrt(773.21 / 2 / 40.79))=3.078626;

[0402] coff(2)=sqrt(dia(2) / (2*then(2)))=sqrt(660 / 2 / 22.77))=3.806935;

[0403] coff(3)=sqrt(dia(3) / (2*then(3)))=sqrt(628.24 / 2 / 13.46))=4.830869;

[0404] memory(4)=sqrt(dia(4) / (2*then(4)))=sqrt(649.56 / 2 / 8.75))=6.092431;

[0405] memory(5)=sqrt(dia(5) / (2*then(5)))=sqrt(634.9 / 2 / 6.31))=7.092886;

[0406] memory(6)=sqrt(dia(6) / (2*then(6)))=sqrt(627.51 / 2 / 4.64))=8.223114;

[0407] memory(7)=sqrt(dia(7) / (2*then(7)))=sqrt(655.25 / 2 / 3.6))=9.539756;

[0408] zip roll (1)=(((((r5*memory(1)+r4)*memory(1)+r3)*memory(1)+r2)*memory(1)+r1)*memory(1)+r0=0.777167;

[0409] zip roll (2)=((((r5*memory(2)+r4)*memory(2)+r3)*memory(2)+r2)*memory(2)+r1)*memory(2)+r0=0.832889;

[0410] zip roll (3)=((((r5*memory(3)+r4)*memory(3)+r3)*memory(3)+r2)*memory(3)+r1)*memory(3)+r0=0.886262;

[0411] zip roll (4)=(((((r5*memory(4)+r4)*memory(4)+r3)*memory(4)+r2)*memory(4)+r1)*memory(4)+r0=0.927337;

[0412] zip roll (5)=(((((r5*memory(5)+r4)*memory(5)+r3)*memory(5)+r2)*memory(5)+r1)*memory(5)+r0=0.949632;

[0413] zip roll(6)=((((r5*coff(6)+r4)*coff(6)+r3)*coff(6)+r2)*coff(6)+r1)*coff(6)+r0=0.969765;

[0414] flsip roll (7)=((((r5*coff(7)+r4)*coff(7)+r3)*coff(7)+r2)*coff(7)+r1)*coff(7)+r0=0.989920.

[0415] Step 3, using the above-mentioned specific forward slip coefficient calculation model, calculate and process the influence coefficient of the reduction rate on the forward slip and the influence coefficient of the roll diameter on the forward slip, and obtain the forward slip coefficient of each stand;

[0416] The calculation process is as follows:

[0417] fslip(1)=1+0.92*flsip eps (1)*flsip roll (1) = 1 + 0.92 * 0.108408 * 0.777167 = 1.077511;

[0418] fslip(2)=1+0.92*flsip eps (2)*flsip roll (2) = 1 + 0.92 * 0.104571 * 0.832889 = 1.080129;

[0419] fslip(3)=1+0.92*flsip eps (3)*flsip roll (3) = 1 + 0.92 * 0.094161 * 0.886262 = 1.076775;

[0420] fslip(4)=1+0.92*flsip eps (4)*flsip roll (4) = 1 + 0.92 * 0.076992 * 0.927337 = 1.065686;

[0421] fslip(5)=1+0.92*flsip eps (5)*flsip roll (5) = 1 + 0.92 * 0.072960 * 0.949632 = 1.063742;

[0422] fslip(6)=1+0.92*flsip eps (6)*flsiproll (6) = 1 + 0.92 * 0.062182 * 0.969765 = 1.055478;

[0423] fslip(7)=1+0.92*flsip eps (7)*flsip roll (7) = 1 + 0.92 * 0.044457 * 0.989920 = 1.040488.

[0424] Step 4, using the relationship model between the forward slip coefficient and the backward slip coefficient specifically defined above, the forward slip coefficient of each rack is calculated and processed to obtain the backward slip coefficient of each rack;

[0425] The calculation process is as follows:

[0426] bslip(1)=then(2)*fslip(1) / then(1)=22.77*1.077511 / 40.79=0.601494;

[0427] bslip(2)=then(3)*fslip(2) / then(2)=13.46*1.080129 / 22.77=0.638495;

[0428] bslip(3)=then(4)*fslip(3) / then(3)=8.75*1.076775 / 13.46=0.699984;

[0429] bslip(4)=then(5)*fslip(4) / then(4)=6.31*1.065686 / 8.75=0.768512;

[0430] bslip(5)=then(6)*fslip(5) / then(5)=4.64*1.063742 / 6.31=0.782213;

[0431] bslip(6)=then(7)*fslip(6) / then(6)=3.6*1.055478 / 4.64=0.818905;

[0432] bslip(7)=then(8)*fslip(7) / then(7)=3.02*1.040488 / 3.6=0.872854;

[0433] Among them, then(8) represents the outlet thickness of the 7th rack.

[0434] Step 5, using the relationship model between the forward slip coefficient and the rack speed, the relationship model between the backward slip coefficient and the rack speed, and the relationship model between the exit speed of the front rack and the entrance speed of the rear rack, the exit speed of the final finishing stand, the forward slip coefficient and the backward slip coefficient of each stand are calculated and processed to obtain the entrance speed, rolling speed and exit speed of each stand;

[0435] The calculation process is as follows:

[0436] v(7)=v ex (7) / fslip(7)=8.00 / 1.040488=7.69(m / s);

[0437] v ex (6) = v en (7)=v(7)*bslip(7)=7.69*0.872854=6.71(m / s);

[0438] v(6)=v ex (6) / fslip(6)=6.71 / 1.055478=6.36(m / s);

[0439] v ex (5) = v en (6)=v(6)*bslip(6)=6.36*0.818905=5.21(m / s);

[0440] v(5)=v ex (5) / fslip(5)=5.21 / 1.063742=4.89(m / s);

[0441] v ex (4) = v en (5)=v(5)*bslip(5)=4.89*0.782213=3.83(m / s);

[0442] v(4)=v ex (4) / fslip(4)=3.83 / 1.065686=3.59(m / s);

[0443] v ex (3) = v en (4)=v(4)*bslip(4)=3.59*0.768512=2.76(m / s);

[0444] v(3)=v ex (3) / fslip(3)=2.76 / 1.076775=2.56(m / s);

[0445] v ex (2) = v en (3)=v(3)*bslip(3)=2.56*0.699984=1.79(m / s);

[0446] v(2)=v ex (2) / fslip(2)=1.79 / 1.080129=1.66(m / s);

[0447] v ex (1) = v en (2)=v(2)*bslip(2)=1.66*0.638495=1.06(m / s);

[0448] v(1)=v ex (1) / fslip(1)=1.06 / 1.077511=0.98(m / s);

[0449] v en (1)=v(1)*bslip(1)=0.98*0.601494=0.59(m / s).

[0450] Step 6, using the above-defined backslip correction coefficients of different steel grades and the backslip correction model of the first finishing stand, the backslip coefficient of the first finishing stand is calculated and processed to obtain a corrected backslip coefficient of the first finishing stand;

[0451] The calculation process is as follows:

[0452] Since the cold rolled material Q195L is rolled in this embodiment, the rough rolling outlet thickness is 40.79 mm, and the target width of the finishing rolling is 1265 mm, the backslip correction coefficient corr is -0.03;

[0453] The corrected backslip coefficient of the first stand of finishing rolling is:

[0454] bslip1(1)=bslip(1)*(1+corr)=0.601494*(1-0.03)=0.583449.

[0455] Step 7, using the relationship model between the backslip coefficient and the stand speed specifically set above, the backslip coefficient of the first stand of the finishing rolling mill after correction is calculated and processed to obtain the inlet speed of the first stand of the finishing rolling mill;

[0456] The calculation process is as follows:

[0457] v en (1)=v(1)*bslip1(1)=0.98*0.583449=0.57(m / s).

[0458] Step 8, using the relationship model between the roller speed before finishing rolling and the inlet speed of the first finishing rolling stand specifically set above, the inlet speed of the first finishing rolling stand is calculated and processed to obtain the roller speed before finishing rolling;

[0459] The calculation process is as follows:

[0460] v roll =v en (1) = 0.57 (m / s).

[0461] According to the above steps, the final roller speed, forward slip coefficient, backward slip coefficient and speed of each frame are as follows:

[0462]

[0463]

[0464] Finish rolling is carried out based on the above-determined parameters. The control between stands is stable during the rolling process, and there is no waist collapse phenomenon before finish rolling.

[0465] Example 5

[0466] This embodiment rolls high-strength steel, steel coil number: 945022201, steel type: TQ700MCD; the rough rolling outlet thickness is 41.71mm, the rough rolling outlet width is 1137.4mm; the strip finishing target thickness is 4.0mm, the finishing target width is 1100mm, and the finishing target temperature is 880°C.

[0467] The relevant data of finishing rolling are as follows:

[0468] The exit speed of the finishing mill is 3.99m / s, and the acceleration is 0.026m / s 2 ;

[0469] frame F0 F1 F2 F3 F4 F5 F6 Inlet thickness (mm) 41.71 22.79 13.94 9.36 6.72 5.44 4.6 Export thickness(mm) 22.79 13.94 9.36 6.72 5.44 4.6 4.01 Inlet temperature(℃) 1015.47 994.62 974.02 954.3 935.96 917.6 899.86 Outlet temperature(℃) 994.62 974.02 954.3 935.96 917.6 899.86 880.14 Reduction rate (%) 45.4 38.8 32.9 28.2 19 15.5 12.8 Roller diameter (mm) 772.42 657.74 638.55 606.6 637.35 624.86 668.26

[0470] F0~F6 represent the 1st to 7th racks.

[0471] Based on the above parameters, the forward and backward sliding control of the finishing mill is carried out through the following steps:

[0472] Step 1, using the first influence coefficient calculation model specifically set above, calculate and process the reduction ratio of each stand corresponding to the finished strip to obtain the influence coefficient of the reduction ratio on the forward slip;

[0473] The calculation process is as follows:

[0474] flsip eps(1)=((((e5*eps(1)+e4)*eps(1)+e3)*eps(1)+e2)*eps(1)+e1)*eps(1)+e0=0.109432;

[0475] flsip eps (2)=((((e5*eps(2)+e4)*eps(2)+e3)*eps(2)+e2)*eps(2)+e1)*eps(2)+e0=0.101362;

[0476] flsip eps (3)=((((e5*eps(3)+e4)*eps(3)+e3)*eps(3)+e2)*eps(3)+e1)*eps(3)+e0=0.089508;

[0477] flsip eps (4)=((((e5*eps(4)+e4)*eps(4)+e3)*eps(4)+e2)*eps(4)+e1)*eps(4)+e0=0.077787;

[0478] flsip eps (5)=((((e5*eps(5)+e4)*eps(5)+e3)*eps(5)+e2)*eps(5)+e1)*eps(5)+e0=0.052426;

[0479] flsip eps (6)=((((e5*eps(6)+e4)*eps(6)+e3)*eps(6)+e2)*eps(6)+e1)*eps(6)+e0=0.042829;

[0480] flsip eps (7)=((((e5*eps(7)+e4)*eps(7)+e3)*eps(7)+e2)*eps(7)+e1)*eps(7)+e0=0.035597.

[0481] Step 2, using the above-mentioned specifically set second influence coefficient calculation model, calculate and process the inlet thickness and roll diameter of each stand corresponding to the finished strip to obtain the influence coefficient of the roll diameter on the forward slip;

[0482] The calculation process is as follows:

[0483] memory(1)=sqrt(dia(1) / (2*then(1)))=sqrt(772.42 / 2 / 41.71))=3.042928;

[0484] memory(2)=sqrt(dia(2) / (2*then(2)))=sqrt(657.74 / 2 / 22.79))=3.798743;

[0485] memory(3)=sqrt(dia(3) / (2*then(3)))=sqrt(638.55 / 2 / 13.94))=4.785762;

[0486] memory(4)=sqrt(dia(4) / (2*then(4)))=sqrt(606.6 / 2 / 9.36))=5.692438;

[0487] memory(5)=sqrt(dia(5) / (2*then(5)))=sqrt(637.35 / 2 / 6.72))=6.886354;

[0488] memory(6)=sqrt(dia(6) / (2*then(6)))=sqrt(624.86 / 2 / 5.44))=7.578389;

[0489] memory(7)=sqrt(dia(7) / (2*then(7)))=sqrt(668.26 / 2 / 4.6))=8.522732;

[0490] zip roll (1)=(((((r5*memory(1)+r4)*memory(1)+r3)*memory(1)+r2)*memory(1)+r1)*memory(1)+r0=0.773946;

[0491] zip roll (2)=((((r5*memory(2)+r4)*memory(2)+r3)*memory(2)+r2)*memory(2)+r1)*memory(2)+r0=0.832358;

[0492] zip roll (3)=((((r5*memory(3)+r4)*memory(3)+r3)*memory(3)+r2)*memory(3)+r1)*memory(3)+r0=0.884376;

[0493] ziproll (4)=((((r5*coff(4)+r4)*coff(4)+r3)*coff(4)+r2)*coff(4)+r1)*coff(4)+r0=0.916355;

[0494] flsip roll (5)=((((r5*coff(5)+r4)*coff(5)+r3)*coff(5)+r2)*coff(5)+r1)*coff(5)+r0=0.945487;

[0495] flsip roll (6)=((((r5*coff(6)+r4)*coff(6)+r3)*coff(6)+r2)*coff(6)+r1)*coff(6)+r0=0.958725;

[0496] flsip roll (7)=((((r5*coff(7)+r4)*coff(7)+r3)*coff(7)+r2)*coff(7)+r1)*coff(7)+r0=0.974601.

[0497] Step 3, using the above-mentioned specific forward slip coefficient calculation model, calculate and process the influence coefficient of the reduction rate on the forward slip and the influence coefficient of the roll diameter on the forward slip, and obtain the forward slip coefficient of each stand;

[0498] The calculation process is as follows:

[0499] fslip(1)=1+0.92*flsip eps (1)*flsip roll (1) = 1 + 0.92 * 0.109432 * 0.773946 = 1.077919;

[0500] fslip(2)=1+0.92*flsip eps (2)*flsip roll (2) = 1 + 0.92 * 0.101362 * 0.832358 = 1.077620;

[0501] fslip(3)=1+0.92*flsip eps (3)*flsip roll (3) = 1 + 0.92 * 0.089508 * 0.884376 = 1.072826;

[0502] fslip(4)=1+0.92*flsipeps (4)*flsip roll (4) = 1 + 0.92 * 0.077787 * 0.916355 = 1.065578;

[0503] fslip(5)=1+0.92*flsip eps (5)*flsip roll (5) = 1 + 0.92 * 0.052426 * 0.945487 = 1.045603;

[0504] fslip(6)=1+0.92*flsip eps (6)*flsip roll (6) = 1 + 0.92 * 0.042829 * 0.958725 = 1.037776;

[0505] fslip(7)=1+0.92*flsip eps (7)*flsip roll (7) = 1 + 0.92 * 0.035597 * 0.974601 = 1.031917.

[0506] Step 4, using the relationship model between the forward slip coefficient and the backward slip coefficient specifically defined above, the forward slip coefficient of each rack is calculated and processed to obtain the backward slip coefficient of each rack;

[0507] The calculation process is as follows:

[0508] bslip(1)=then(2)*fslip(1) / then(1)=22.79*1.077919 / 41.71=0.588966;

[0509] bslip(2)=then(3)*fslip(2) / then(2)=13.94*1.077620 / 22.79=0.659150;

[0510] bslip(3)=then(4)*fslip(3) / then(3)=9.36*1.072826 / 13.94=0.720348;

[0511] bslip(4)=then(5)*fslip(4) / then(4)=6.72*1.065578 / 9.36=0.765030;

[0512] bslip(5)=then(6)*fslip(5) / then(5)=5.44*1.045603 / 6.72=0.846440;

[0513] bslip(6)=then(7)*fslip(6) / then(6)=4.6*1.037776 / 5.44=0.877531;

[0514] bslip(7)=then(8)*fslip(7) / then(7)=4.01*1.031917 / 4.6=0.899563;

[0515] Among them, then(8) represents the outlet thickness of the 7th rack.

[0516] Step 5, using the relationship model between the forward slip coefficient and the rack speed, the relationship model between the backward slip coefficient and the rack speed, and the relationship model between the exit speed of the front rack and the entrance speed of the rear rack, the exit speed of the final finishing stand, the forward slip coefficient and the backward slip coefficient of each stand are calculated and processed to obtain the entrance speed, rolling speed and exit speed of each stand;

[0517] The calculation process is as follows:

[0518] v(7)=3.87(m / s); v ex (6)=3.48(m / s); v(6)=3.35(m / s); v ex (5)=2.94(m / s); v(5)=2.81(m / s);

[0519] v ex (4)=2.38(m / s); v(4)=2.23(m / s); v ex (3)=1.71(m / s); v(3)=1.59(m / s); v ex (2) = 1.15 (m / s);

[0520] v(2)=1.07(m / s);v ex (1)=0.70(m / s); v(1)=0.65(m / s); v en (1) = 0.38 (m / s).

[0521] Step 6, using the above-defined backslip correction coefficients of different steel grades and the backslip correction model of the first finishing stand, the backslip coefficient of the first finishing stand is calculated and processed to obtain a corrected backslip coefficient of the first finishing stand;

[0522] The calculation process is as follows:

[0523] Since this embodiment rolls high-strength steel, the rough rolling outlet thickness is 41.71 mm, and the finishing rolling target width is 1100 mm, the backslip correction coefficient corr is set to 0;

[0524] The corrected backslip coefficient of the first stand of finishing rolling is:

[0525] bslip1(1)=bslip(1)*(1+corr)=0.568009*(1-0)=0.568009.

[0526] Step 7, using the relationship model between the backslip coefficient and the stand speed specifically set above, the backslip coefficient of the first stand of the finishing rolling mill after correction is calculated and processed to obtain the inlet speed of the first stand of the finishing rolling mill;

[0527] The calculation process is as follows:

[0528] v en (1)=v(1)*bslip1(1)=0.65*0.568009=0.38(m / s).

[0529] Step 8, using the relationship model between the roller speed before finishing rolling and the inlet speed of the first finishing rolling stand specifically set above, the inlet speed of the first finishing rolling stand is calculated and processed to obtain the roller speed before finishing rolling;

[0530] The calculation process is as follows:

[0531] v roll =v en (1) = 0.38 (m / s).

[0532] According to the above steps, the final roller speed, forward slip coefficient, backward slip coefficient and speed of each frame are as follows:

[0533] frame roll F0 F1 F2 F3 F4 F5 F6 fslip 1.077919 1.077620 1.072826 1.065578 1.045603 1.037776 1.031917 bslip 0.588966 0.659150 0.720348 0.765030 0.846440 0.877531 0.899563 <![CDATA[v en ]]> 0.38 0.70 1.15 1.71 2.38 2.94 3.48 v 0.65 1.07 1.59 2.23 2.81 3.35 3.87 <![CDATA[v ex ]]> 0.70 1.15 1.71 2.38 2.94 3.48 3.99 <![CDATA[v roll ]]> 0.38

[0534] Finish rolling is carried out based on the above-determined parameters. The control between stands is stable during the rolling process, and there is no waist collapse phenomenon before finish rolling.

[0535] It can be seen that the forward and backward sliding control method of the finishing mill provided in the embodiment of the present invention can ensure the consistency control of the second flow rate between frames, improve the rolling stability between frames, avoid the collapse of soft steel grades in front of the finishing mill, and improve the surface quality of soft steel grades.

[0536] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this article are all referenced to the placement state shown in the accompanying drawings.

[0537] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for controlling the forward and backward sliding of a finishing mill, characterized in that: include: Using the preset first influence coefficient calculation model, the reduction rate of each stand corresponding to the finished strip is calculated and processed to obtain the influence coefficient of the reduction rate on the forward slip; Using the preset second influence coefficient calculation model, the inlet thickness and roll diameter of each stand corresponding to the finished strip are calculated and processed to obtain the influence coefficient of the roll diameter on the forward slip; Using the preset forward slip coefficient calculation model, the influence coefficient of the reduction rate on the forward slip and the influence coefficient of the roll diameter on the forward slip are calculated and processed to obtain the forward slip coefficient of each stand; Using a preset relationship model between the forward slip coefficient and the backward slip coefficient, the forward slip coefficient of each rack is calculated and processed to obtain the backward slip coefficient of each rack; By using the preset relationship model between the forward slip coefficient and the rack speed, the relationship model between the backward slip coefficient and the rack speed, and the relationship model between the exit speed of the front rack and the entrance speed of the rear rack, the exit speed of the final stand of the finishing rolling mill, the forward slip coefficient and the backward slip coefficient of each stand are calculated and processed to obtain the entrance speed, rolling speed and exit speed of each stand; By using the preset backslip correction coefficients of different steel grades and the preset backslip correction model of the first finishing stand, the backslip coefficient of the first finishing stand is calculated and processed to obtain the corrected backslip coefficient of the first finishing stand; By using the preset relationship model between the backslip coefficient and the stand speed, the backslip coefficient of the first stand of the finishing rolling mill after the correction is calculated and processed to obtain the inlet speed of the first stand of the finishing rolling mill; By using the preset relationship model between the roller speed before finishing and the inlet speed of the first finishing stand, the inlet speed of the first finishing stand is calculated to obtain the roller speed before finishing.

2. The method for controlling the forward and backward sliding of the finishing mill according to claim 1, characterized in that: The first influence coefficient calculation model expression is: flsip eps (i)=((((e5*eps(i)+e4)*eps(i)+e3)*eps(i)+e2)*eps(i)+e1)*eps(i)+e0; Among them, i represents the rack number identification, flsip eps (i) represents the influence coefficient of the reduction rate corresponding to the i-th rack on the forward sliding, eps(i) represents the reduction rate of the i-th rack, and e5, e4, e3, e2, e1 and e0 represent the reduction rate coefficients.

3. The method for controlling the forward and backward sliding of the finishing mill according to claim 2, characterized in that: The reduction coefficient is set to: 。 4. The method for controlling the forward and backward sliding of a finishing mill according to claim 1, characterized in that: The second influence coefficient calculation model expression is: zip roll (i)=(((((r5*memory(i)+r4)*memory(i)+r3)*memory(i)+r2)*memory(i)+r1)*memory(i)+r0; Among them, i represents the rack number identification, flsip roll (i) represents the influence coefficient of the roller diameter corresponding to the i-th stand on the forward slip, r5, r4, r3, r2, r1 and r0 represent the roller diameter coefficients, coff(i) represents the intermediate calculation coefficient corresponding to the i-th stand, and the intermediate calculation coefficient coff(i) is expressed as: coff(i)=sqrt(dia(i) / (2*then(i))); Where i is the rack number, dia(i) is the roll diameter of the i-th rack, then(i) is the inlet thickness of the i-th rack, and sqrt is the square root calculation.

5. The method for controlling the forward and backward sliding of the finishing mill according to claim 4, characterized in that: The roller diameter coefficient is set to: 。 6. The method for controlling the forward and backward sliding of a finishing mill according to claim 1, characterized in that: The forward slip coefficient calculation model expression is: fslip(i)=1+0.92*flsip eps (i)*flsip roll (i); Where i represents the rack number, fslip(i) represents the forward slip coefficient of the i-th rack, and flsip eps (i) represents the influence coefficient of the depression rate corresponding to the i-th frame on the forward sliding, flsip roll (i) represents the influence coefficient of the roll diameter corresponding to the i-th stand on the forward slip.

7. The method for controlling the forward and backward sliding of a finishing mill according to claim 1, characterized in that: The relationship model expression between the forward slip coefficient and the backward slip coefficient is: bslip(i)=then(i+1)*fslip(i) / then(i); Among them, i represents the rack number identification, bslip(i) represents the back slip coefficient of the i-th rack, fslip(i) represents the front slip coefficient of the i-th rack, then(i+1) represents the entrance thickness of the i+1-th rack, and then(i) represents the entrance thickness of the i-th rack.

8. The method for controlling the forward and backward sliding of a finishing mill according to claim 1, characterized in that: The relationship model expression between the forward slip coefficient and the rack speed is: v(i)=v ex (i) / fslip(i); The relationship model expression between the backslip coefficient and the rack speed is: v en (i)=v(i)*bslip(i); The relationship model expression between the outlet speed of the front rack and the inlet speed of the rear rack is: v ex (i)=v en (i+1); Where i represents the rack number, v(i) represents the rolling speed of the i-th rack, and v ex (i) represents the exit speed of the i-th rack, fslip(i) represents the forward slip coefficient of the i-th rack, v en (i) represents the inlet velocity of the i-th rack, bslip(i) represents the backslip coefficient of the i-th rack, v en (i+1) represents the inlet velocity of the i+1th rack.

9. The method for controlling the forward and backward sliding of a finishing mill according to claim 1, characterized in that: The backslip correction factor for different steel grades is set as: Wherein, when the value of the backslip correction coefficient is a range value, the value of the backslip correction coefficient includes the lower boundary value and does not include the upper boundary value; The correction model expression of the back slip coefficient of the first stand of finishing rolling is: bslip1(1)=bslip(1)*(1+corr); Wherein, bslip1(1) represents the backslip coefficient of the first stand of the finishing mill after correction, bslip(1) represents the backslip coefficient of the first stand of the finishing mill before correction, and corr represents the backslip correction coefficient.

10. The method for controlling the forward and backward sliding of a finishing mill according to claim 1, characterized in that: The relationship model expression between the roller speed before finishing and the entrance speed of the first stand of finishing is: v roll =v en (1); Among them, v roll Indicates the roller speed before finishing rolling, v en (1) Indicates the inlet speed of the first stand of finishing mill.

Images