CN114472545B - Dynamic control method for loop lifting angle of finishing mill loop - Google Patents
Dynamic control method for loop lifting angle of finishing mill loop Download PDFInfo
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/48—Tension control; Compression control
- B21B37/50—Tension control; Compression control by looper control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B41/00—Guiding, conveying, or accumulating easily-flexible work, e.g. wire, sheet metal bands, in loops or curves; Loop lifters
Abstract
A dynamic control method for loop lifting angle of finishing mill belongs to the technical field of hot continuous rolling, solves the technical problems of unstable rolling, plate shape defect and the like caused by second flow mismatch among racks, and comprises the following steps: s1, respectively determining speed correction coefficients for long genetic conditions and short genetic conditionskvuk(i) The method comprises the steps of carrying out a first treatment on the surface of the S2, correcting the speed among the frames; s3, determining a speed correction coefficient of the steel billet after rollingkvuk 1 (i). According to the dynamic control method for the loop lifting angle of the finishing mill, provided by the invention, the accuracy of speed calculation is obviously improved, the loop angle is dynamically adjusted, the critical effects on rolling stability, plate shape control and the like are achieved, and the field waste amount is greatly reduced. Particularly plays a key role in rolling stability of high-hardness, high-strength and thin-specification varieties, promotes thinning of various specifications, and has wide popularization and application values.
Description
Technical Field
The invention belongs to the technical field of hot continuous rolling, and particularly relates to a dynamic control method for a loop lifting angle of a finish rolling mill.
Background
The main production process of the hot continuous rolling production line is as follows: firstly, heating a plate blank in a heating furnace according to the temperature specified by the process; secondly, heating to a target temperature, and then entering a roughing mill to roll, wherein a roughing vertical roll controls the width, a flat roll controls the thickness, and rolling by a roughing mill set to enable the strip steel to reach preset target thickness, width and temperature; thirdly, entering a finishing mill group to perform seven-frame continuous rolling so that the strip steel reaches the preset target thickness and temperature; finally, the strip steel is formed into a steel coil by a coiling machine.
The seven frames are respectively F0, F1, F2, F3, F4, F5 and F6, and loop devices are arranged between every two frames in the continuous rolling process of the seven frames, when the strip steel of the latter frame bites the strip steel and wears the strip steel, the loop device is sleeved to a certain angle to support the strip steel, and the strip steel is ensured to stably wear the strip steel under a certain tension.
The seven frames for finish rolling are provided with 6 loops, and loops between F0-F1, F1-F2, F2-F3, F3-F4, F4-F5 and F5-F6 are respectively named as 0# loop, 1# loop, 2# loop, 3# loop, 4# loop and 5# loop. When the strip steel bites the steel and wears the strip, the standard loop lifting angle of the loop is 25 degrees, and the actual loop lifting angle is determined by the second flow rate between the frames:
1) If the second flow rate of the former frame of a certain loop is completely equal to the second flow rate of the latter frame, the loop lifting angle is 25 degrees;
2) If the second flow rate of the former frame of the loop is larger than the second flow rate of the latter frame, the phenomenon of virtual loop occurs when the strip steel is worn, namely the tension between the front frame and the rear frame can not reach the given tension. Under the condition, the loop can continue to be sleeved until the loop is completely contacted with the strip steel and a given tension is formed between the two frames, so that the loop is excessively high in lifting, and the phenomena of strip steel deflection, rolling and other scrap steel phenomena can occur in severe cases;
3) If the second flow rate of the former frame of the loop is smaller than the second flow rate of the latter frame, the phenomenon of drawing steel can occur when the strip steel is worn, namely the tension between the front frame and the rear frame is larger than the given tension, under the condition, the loop can be very low to reach the standard angle, the strip steel can be narrowed due to the overlarge tension, and the strip steel is broken and other waste steel faults are caused when the tension is serious. Moreover, the excessive high or low loop can cause the follow-up loop to be out of control in adjustment, so that the strip steel is deviated, rolled and stacked, and other field faults are caused;
in summary, control of the loop lifting angle is critical to control of rolling stability of hot continuous rolling, however, the existing hot continuous rolling equipment has the problem of slow loop response speed. When the strip steel bites and wears, especially when rolling some special steel grades, the loop lifting angle is very unstable, the loop lifting angle reaches more than 50 degrees when the loop lifting angle is highest, and the loop lifting angle is less than 15 degrees when the loop lifting angle is lowest, and the fault of the scrap steel occurs for many times.
Disclosure of Invention
The invention aims to overcome the defects in the background art and solve the technical problems of unstable rolling, plate shape defects and the like caused by second flow mismatch among frames, and provides a dynamic control method for loop lifting angles of a finishing mill.
The invention is realized by the following technical scheme.
A dynamic control method for a loop lifting angle of a finishing mill comprises the following steps:
s1, determining a speed correction coefficient kvuk (i) for a long genetic condition and a short genetic condition respectively:
in the pressure correction coefficient database:
1) The method for determining the speed correction coefficient under the long genetic condition comprises the following steps:
when the number of similar steels in the pressure correction coefficient database is greater than or equal to 30 steels, taking the average value of the pressure correction coefficients of the nearest 30 steels as the speed correction coefficient of the steel billet;
when the number of similar steels in the pressure correction coefficient database is smaller than 30 steel blocks, the speed correction coefficient is the average value of the pressure correction coefficients of the actual steel block number;
when the steel grade is not in the pressure correction coefficient database, the speed correction coefficient is a default value of 0.0;
2) The method for determining the speed correction coefficient under the short genetic condition comprises the following steps:
when the steel grade is unchanged or the change value of the thickness and the width is within +/-10%, the speed correction coefficient is calculated after the rolling of the upper steel is finished;
s2, correcting the speed among the frames:
on the basis of original speed calculation, adding a speed correction coefficient kvuk (i) determined in the step S1, namely, correcting the speed among the frames as follows:
v 1 (i)＝v(i)*(1.0+kvuk(i))； (12)
wherein i represents a frame number, i=0 to 5; v (i) is the calculation speed before correction, v 1 (i) Is the corrected speed;
s3, determining a speed correction coefficient kvuk after rolling the steel billet 1 (i)：
S3-1, after each billet is rolled, the F6 stand does not carry out speed correction, and each stand from the F0 stand to the F5 stand needs to determine a single stand speed correction coefficient kvui again, i=0-5, and the specific numerical relation of kvui is shown in the following table 1;
table 1 single-carriage speed correction factor kvui
The end point values of each column in the table 1 respectively represent the upper limit value and the lower limit value of the single-frame speed correction coefficient kvui, and the upper limit value is less than or equal to the kvui and less than the lower limit value;
s3-2, determining a combined speed correction coefficient kvu (i) of each rack according to the step S3-1:
and (3) carrying out speed correction on each frame from the F5 frame to the F0 frame in sequence:
kvu(5)＝kvu5； (13)
kvu(4)＝kvu4+kvu5； (14)
kvu(3)＝kvu3+kvu4+kvu5； (15)
kvu(2)＝kvu2+kvu3+kvu4+kvu5； (16)
kvu(1)＝kvu1+kvu2+kvu3+kvu4+kvu5； (17)
kvu(0)＝kvu0+kvu1+kvu2+kvu3+kvu4+kvu5； (18)
s3-3, determining a speed correction coefficient kvuk according to the step S3-1 and the step S3-2 1 (i)：
kvuk 1 (i)＝kvuk(i)+kvu(i)/100； (19)
Wherein kvuk (i) is a velocity correction coefficient of the value obtained by rolling the billet of the block, kvuk 1 (i) The coefficient value is corrected for the calculated speed after the rolling of the steel billet is completed.
Further, in the step S1, the long genetic condition includes at least one of the following conditions:
1) When the steel grade of the steel billet is inconsistent with the steel grade of the upper steel block;
2) When the thickness of the steel billet is larger than +/-10% of the thickness of the upper steel billet;
3) When the width of the steel billet is larger than the width of the upper steel billet by +/-10 percent.
Further, the speed correction coefficient kvuk after rolling the steel billet determined in the step S3 1 (i) With corresponding steel grade and thicknessEstablishing a database together with the width data, and storing corresponding data in the database; kvuk when the lower billet is rolled under short inheritance conditions 1 (i) The calculated value is used for correcting the lower billet; kvuk when the lower billet is rolled under long inheritance conditions 1 (i) The calculated value is used for selecting and calculating the strip steel in the same batch after rolling.
According to the technical proposal, when rolling the same batch of strip steel (namely short hereditary condition), according to the difference value of the actual loop lifting angle and the standard loop lifting angle of the loop among the frames, the corresponding correction value kvu is taken from the table 1, and according to the formulas (13) to (19), the speed correction coefficient kvuk of the steel billet is calculated 1 (i) The method is used for speed correction calculation of the lower billet. Thus, kvuk is greater when the actual loop lifting angle is greater than the standard loop lifting angle 1 (i) Negative, the speed of the frame before the loop is automatically reduced by the lower billet; kvuk is smaller than the standard loop lifting angle when the actual loop lifting angle of the loop is smaller than the standard loop lifting angle of the loop 1 (i) The speed of the frame before the loop is automatically increased by the lower billet for positive value, thereby achieving the purpose of automatically adjusting the loop angle between the frames. When the band steel batch changes (namely, long genetic conditions), kvuk (i) can also take out the correction value with the same specification nearest to the current rolling state and is used for calculating the speed of each frame, so that the actual second flow of each frame is equal to the maximum extent, and the stability of loop lifting is ensured.
Compared with the prior art, the invention has the beneficial effects that:
according to the dynamic control method for the loop lifting angle of the finishing mill, which is provided by the invention, the accuracy of speed calculation is obviously improved, the loop angle is dynamically adjusted, the rolling stability is substantially improved, and the field waste amount is greatly reduced. Particularly plays a key role in rolling stability of high-hardness, high-strength and thin-specification varieties, and promotes thinning of various specifications.
In a word, the invention plays a very key role in rolling stability, plate shape control and the like, belongs to a core technology of hot rolling control, and has wide popularization and application values under the background of particularly intense competition in the steel industry.
Drawings
FIG. 1 is a flow chart of a control system for hot continuous rolling;
FIG. 2 is a process flow diagram of a hot continuous rolling line;
in fig. 2, 1 is a heating furnace (4 seats), 2 is a high-pressure water descaling box, 3 is a rough rolling vertical rolling mill (VE 0), 4 is a rough rolling flat rolling mill (R0), 5 is a heat insulation cover, 6 is a rotary drum type crop flying shear, 7 is a finish rolling frame (7 frames), 8 is a convexity meter, 9 is a width meter, 10 is a thickness meter, 11 is a flatness meter, and 12 is a coiling machine.
Detailed Description
The process flow of the hot continuous rolling production line shown in fig. 2 is controlled by a two-stage computer, namely, a process control computer (L2 computer) and a basic automation computer (L1), and the execution process of each control parameter is shown in fig. 1.
In the prior art, in the control method of the loop lifting angleThe loop lifting angle is determined by whether the second flow rates of the frames before and after the loop are equal, so the second flow rate is the basis of the loop lifting angle, and the second flow rate of each frame in finish rolling is calculated by the following formula:
phi(i)＝thex(i)*wdex(i)*v(i)； (1)
wherein i represents a frame number, and F0-F6 frame numbers are respectively 0-6;
phi (i) represents the outlet second flow rate of the ith rack, and the unit is m 3 /s；
the x (i) represents the outlet thickness of the ith frame in m;
the index (i) represents the outlet width of the ith rack, and the unit is m;
v (i) represents the i-th gantry exit velocity in m/s.
In order to ensure that the looper between the frames of the finish rolling is normal, the second flow rate of the outlet of each frame is ensured to be equal to the second flow rate of the inlet of the finish rolling during model calculation, namely
phi(i)＝phi(i+1)； (2)
Wherein i=0 to 5.
In a hot continuous rolling system, width control is mainly finished in a rough rolling area, a finish rolling continuous rolling machine frame has no width control, and the outlet width of each machine frame of the finish rolling is basically consistent, so that in the calculation of a hot continuous rolling model, in order to ensure that the second flow of each machine frame is equal, the following condition of the formula (3) is only required to be satisfied:
thex(i)*v(i)＝thex(i+1)*v(i+1)； (3)
wherein i=0 to 5.
In the model calculation, the control method for ensuring the equality of the second flow comprises the following steps:
step one: calculating the outlet thickness of each frame (thex (i)) according to the thickness of the rough rolling outlet (namely the thickness of the finish rolling inlet), the thickness of the finish rolling outlet and the rolling reduction of each frame:
thex(i)＝thex(i-1)-thex(i-1)*eps(i)； (4)
wherein, thex (i) refers to the outlet thickness heat value of each frame; the x (i-1) represents the outlet thickness of the previous frame, i.e., the inlet thickness of the present frame; when i=0, then (i-1) means the rough rolling outlet thickness then, i.e., the finish rolling inlet thickness, and when i=6, then (i) means the finish rolling outlet thickness; eps (i) represents the pressing-in rate of the stand, and the pressing-in rate of each stand is circularly calculated according to the initial pressing-in rate, the thickness of the rough rolling outlet and the thickness of the finish rolling outlet;
step two: the finish rolling outlet speed va, namely the finish rolling end frame outlet speed v (6), is calculated according to the rough rolling outlet temperature, the finish rolling target temperature, the heat loss of the finish rolling area and the like:
v(6)＝va； (5)
step three: according to formula (3), the exit velocity of each rack is calculated sequentially forward, starting from the last rack, namely:
v(5)＝thex(6)*v(6)/thex(5)； (6)
v(4)＝thex(5)*v(5)/thex(4)； (7)
v(3)＝thex(4)*v(4)/thex(3)； (8)
v(2)＝thex(3)*v(3)/thex(2)； (9)
v(1)＝thex(2)*v(2)/thex(1)； (10)
v(0)＝thex(1)*v(1)/thex(0)。 (11)
in an ideal state, the purpose of equality of second flow can be achieved according to the outlet thickness and the outlet speed of each rack calculated in the step one to the step three, but in actual production, the actual outlet thickness of each rack and the calculated outlet thickness cannot be completely the same, so that when field control is carried out according to the calculated speed, deviation exists between the second flow of each rack, and the loop lifting angle is unstable. The standard loop lifting angle of the loop is 25 degrees, and if the second flow rate of the former frame of a certain loop is completely equal to the second flow rate of the latter frame, the loop lifting angle is 25 degrees; if the second flow rate of the former frame of the loop is greater than the second flow rate of the latter frame, the phenomenon of virtual loop occurs when the strip steel wears, namely the tension between the front frame and the rear frame cannot reach the given tension, in this case, the loop can continue to take the loop at an angle of more than 25 DEG until the loop fully contacts the strip steel and the given tension is formed between the two frames, so that the loop can be excessively high, and the phenomena of strip steel deflection, stack rolling and other scrap steel phenomena can occur in serious cases; if the second flow rate of the former frame of the loop is smaller than the second flow rate of the latter frame, the phenomenon of steel pulling occurs when the strip steel is worn, namely the tension between the front frame and the rear frame is larger than the given tension, under the condition, the loop can be very low to reach the standard angle of 25 degrees, the strip steel can be narrowed due to the overlarge tension, and the strip steel breaks and other scrap steel faults are caused when the strip steel is seriously broken. Moreover, the excessive high or low loop can cause the follow-up loop to be out of control in adjustment, so that the strip steel is deviated, rolled and stacked, and other field faults are caused. Therefore, the current second flow control thought is modified, and the invention discloses a novel speed control method which is very urgent to solve the problem that the current loop lifting angle is unstable.
The invention provides a dynamic control method for a loop lifting angle of a finishing mill, which comprises the following steps:
a dynamic control method for a loop lifting angle of a finishing mill comprises the following steps:
s1, determining a speed correction coefficient kvuk (i) for a long genetic condition and a short genetic condition respectively:
in the pressure correction coefficient database:
1) The method for determining the speed correction coefficient under the long genetic condition comprises the following steps:
when the number of similar steels in the pressure correction coefficient database is greater than or equal to 30 steels, taking the average value of the pressure correction coefficients of the nearest 30 steels as the speed correction coefficient of the steel billet;
when the number of similar steels in the pressure correction coefficient database is smaller than 30 steel blocks, the speed correction coefficient is the average value of the pressure correction coefficients of the actual steel block number;
when the steel grade is not in the pressure correction coefficient database, the speed correction coefficient is a default value of 0.0;
2) The method for determining the speed correction coefficient under the short genetic condition comprises the following steps:
when the steel grade is unchanged or the change value of the thickness and the width is within +/-10%, the speed correction coefficient is calculated after the rolling of the upper steel is finished;
s2, correcting the speed among the frames:
on the basis of original speed calculation, adding a speed correction coefficient kvuk (i) determined in the step S1, namely, correcting the speed among the frames as follows:
v 1 (i)＝v(i)*(1.0+kvuk(i))； (12)
wherein i represents a frame number, i=0 to 5; v (i) is the calculated speed before correction, i.e. the speed calculated according to formulas (6) to (11), v 1 (i) Is the corrected speed;
s3, determining a speed correction coefficient kvuk after rolling the steel billet 1 (i)：
S3-1, after each billet is rolled, the F6 stand does not carry out speed correction, and each stand from the F0 stand to the F5 stand needs to determine a single stand speed correction coefficient kvui again, i=0-5, and the specific numerical relation of kvui is shown in the following table 1;
table 1 single-carriage speed correction factor kvui
The end point values of each column in the table 1 respectively represent the upper limit value and the lower limit value of the single-frame speed correction coefficient kvui, and the upper limit value is less than or equal to the kvui and less than the lower limit value;
s3-2, determining a combined speed correction coefficient kvu (i) of each rack according to the step S3-1:
the speed correction of each frame is sequentially carried out from the F5 frame to the F0 frame, so that the calculation aims at ensuring that the second flow of each frame among frames is still corrected according to the principle of equal second flow after the speed correction of a single frame:
kvu(5)＝kvu5； (13)
kvu(4)＝kvu4+kvu5； (14)
kvu(3)＝kvu3+kvu4+kvu5； (15)
kvu(2)＝kvu2+kvu3+kvu4+kvu5； (16)
kvu(1)＝kvu1+kvu2+kvu3+kvu4+kvu5； (17)
kvu(0)＝kvu0+kvu1+kvu2+kvu3+kvu4+kvu5； (18)
s3-3, determining a speed correction coefficient kvuk according to the step S3-1 and the step S3-2 1 (i)：
kvuk 1 (i)＝kvuk(i)+kvu(i)/100； (19)
Wherein kvuk (i) is a velocity correction coefficient of the value obtained by rolling the billet of the block, kvuk 1 (i) The coefficient value is corrected for the calculated speed after the rolling of the steel billet is completed.
Further, in the step S1, the long genetic condition includes at least one of the following conditions:
1) When the steel grade of the steel billet is inconsistent with the steel grade of the upper steel block;
2) When the thickness of the steel billet is larger than +/-10% of the thickness of the upper steel billet;
3) When the width of the steel billet is larger than the width of the upper steel billet by +/-10 percent.
Further, the speed correction coefficient kvuk after rolling the steel billet determined in the step S3 1 (i) Establishing a database together with corresponding steel grade, thickness and width data, and storing corresponding data in the database; kvuk when the lower billet is rolled under short inheritance conditions 1 (i) The calculated value is used for correcting the lower billet; kvuk when the lower billet is rolled under long inheritance conditions 1 (i) The calculated value is used for selecting and calculating the strip steel in the same batch after rolling.
According to the aboveAccording to the technical scheme, when the same batch of strip steel (namely short genetic condition) is rolled, according to the difference value of the actual loop lifting angle and the standard loop lifting angle of each loop between the frames, a corresponding correction value kvu is taken from a table 1, and according to the formulas (13) to (19), the speed correction coefficient kvuk of the steel billet is calculated 1 (i) The method is used for speed correction calculation of the lower billet. Thus, kvuk is greater when the actual loop lifting angle is greater than the standard loop lifting angle 1 (i) Negative, the speed of the frame before the loop is automatically reduced by the lower billet; kvuk is smaller than the standard loop lifting angle when the actual loop lifting angle of the loop is smaller than the standard loop lifting angle of the loop 1 (i) The speed of the frame before the loop is automatically increased by the lower billet for positive value, thereby achieving the purpose of automatically adjusting the loop angle between the frames. When the band steel batch changes (namely, long genetic conditions), kvuk (i) can also take out the correction value with the same specification nearest to the current rolling state and is used for calculating the speed of each frame, so that the actual second flow of each frame is equal to the maximum extent, and the stability of loop lifting is ensured.
The present invention will be described in further detail with reference to examples.
Example 1
This example 1 produced plain carbon steel Q195-W, target thickness 2.75mm, target width 1235mm.
The steel is the first steel of the batch, the steel coil number is 919059401, the rough rolling outlet thickness is 42.709mm, the finish rolling inlet width is 1270.03mm, the rough rolling outlet temperature is 1085.2 ℃, the finish rolling target temperature is 880 ℃, and the specific components (wt.%) are as follows: c:0.04%, si:0.0159%, mn:0.2214%, P:0.007%, S:0.0132%, al:0.000%, cr:0.0209%, ni:0.0095%, cu:0.016%, mo:0.0067%, ti:0.0010%, V:0.0017%, nb:0.0010%, N:0.0032%, B:0%.
The self-adaptive method of the speed of each rack is calculated according to the following steps:
(1) The thickness of the rough rolling outlet is 42.709mm, and the rolling reduction (%) of each of the frames F0 to F6 is 46.7%, 47.5%, 35.9%, 26.2%, 25.5%, 21.4% and 16.0%. According to equation (4), the exit thickness (mm) of each rack is as follows:
thex(0)＝then-then*eps(0)＝42.709-42.709*46.7％＝22.7639；
thex(1)＝thex(0)-thex(0)*eps(1)＝22.7639-22.7639*47.5％＝11.9511；
thex(2)＝thex(1)-thex(1)*eps(2)＝11.9511-11.9511*35.9％＝7.6607；
thex(3)＝thex(2)-thex(2)*eps(3)＝7.6607-7.6607*26.2％＝5.6536；
thex(4)＝thex(3)-thex(3)*eps(4)＝5.6536-5.6536*25.5％＝4.2119；
thex(5)＝thex(4)-thex(4)*eps(5)＝4.2119-4.2119*21.4％＝3.3106；
thex(6)＝thex(5)-thex(5)*eps(6)＝3.3106-3.3106*16.0％＝2.7809；
i.e. the finishing mill outlet thickness heat value is 2.7809mm.
(2) The finish rolling outlet velocity was calculated to be 7.8m/s based on the rough rolling outlet temperature 1085.2 ℃, the finish rolling target temperature 880 ℃, the heat loss in the finish rolling region, and the like, namely, the finish rolling end stand outlet velocity v (6):
v(6)＝7.8m/s。
(3) According to the formulas (6) to (11), the outlet speed (m/s) of each rack is calculated sequentially from the last rack, namely:
v(5)＝thex(6)*v(6)/thex(5)＝2.7809*7.8/3.3106＝6.55；
v(4)＝thex(5)*v(5)/thex(4)＝3.3106*6.55/4.2119＝5.15；
v(3)＝thex(4)*v(4)/thex(3)＝4.2119*5.15/5.6536＝3.84；
v(2)＝thex(3)*v(3)/thex(2)＝5.6536*3.84/7.6607＝2.83；
v(1)＝thex(2)*v(2)/thex(1)＝7.6607*2.83/11.9511＝1.81；
v(0)＝thex(1)*v(1)/thex(0)＝11.9511*1.81/22.7639＝0.95。
(4) The steel is the first steel of the batch, the velocity correction coefficient kvuk (i) is a long-term value, and the kvuk values of F0-F5 are respectively 0.0, -0.01, -0.03, 0.01, -0.02 and-0.03.
(5) According to formula (12), the corrected frame speeds (m/s) are calculated as:
v 1 (0)＝v(0)*(1.0+kvuk(0))＝0.95*(1.0+0.0)＝0.95；
v 1 (1)＝v(1)*(1.0+kvuk(1))＝1.81*(1.0-0.01)＝1.79；
v 1 (2)＝v(2)*(1.0+kvuk(2))＝2.83*(1.0-0.03)＝2.75；
v 1 (3)＝v(3)*(1.0+kvuk(3))＝3.84*(1.0+0.01)＝3.88；
v 1 (4)＝v(4)*(1.0+kvuk(1))＝5.15*(1.0-0.02)＝5.05；
v 1 (5)＝v(5)*(1.0+kvuk(1))＝6.55*(1.0-0.03)＝6.35；
specific parameters of each frame are shown in Table 2 below.
Table 2 specific process parameters for each frame in example 1
(6) Calculating the speed correction coefficient of the rolled steel
Step 1: determining a single carriage speed correction factor kvu:
after the steel block is rolled, the actual sleeve lifting angles (°) of the 0# to 5# loops are respectively 27, 35, 20, 24, 29 and 31, and the difference values between the actual sleeve lifting angles and the standard sleeve lifting angles of the loops are respectively 2, 10, -5, -1, 4 and 6, and kvu are respectively taken according to the table 1:
kvu0＝-0.2；
kvu1＝-1.2；
kvu2＝0.7；
kvu3＝0；
kvu4＝-0.4；
kvu5＝-0.7；
step 2: according to the formulas (13) to (18), calculating the combined speed correction coefficient kvu (i) of each rack:
kvu(5)＝kvu5＝-0.7；
kvu(4)＝kvu4+kvu5＝-0.4-0.7＝-1.1；
kvu(3)＝kvu3+kvu4+kvu5＝0-0.4-0.7＝-1.1；
kvu(2)＝kvu2+kvu3+kvu4+kvu5＝0.7+0-0.4-0.7＝-0.4；
kvu(1)＝kvu1+kvu2+kvu3+kvu4+kvu5＝-1.2+0.7+0-0.4-0.7＝-1.6；
kvu(0)＝kvu0+kvu1+kvu2+kvu3+kvu4+kvu5＝-0.2-1.2+0.7+0-0.4-0.7＝-1.8；
step 3: according to formula (19), a velocity correction coefficient kvuk is calculated 1 (i)；
kvuk 1 (0)＝kvuk(0)+kvu(0)/100＝0.0+(-1.8/100)＝-0.018；
kvuk 1 (1)＝kvuk(1)+kvu(1)/100＝-0.01+(-1.6/100)＝-0.026；
kvuk 1 (2)＝kvuk(2)+kvu(2)/100＝-0.03+(-0.4/100)＝-0.034；
kvuk 1 (3)＝kvuk(3)+kvu(3)/100＝0.01+(-1.1/100)＝-0.001；
kvuk 1 (4)＝kvuk(4)+kvu(4)/100＝-0.02+(-1.1/100)＝-0.031；
kvuk 1 (5)＝kvuk(5)+kvu(5)/100＝-0.03+(-0.7/100)＝-0.037；
After the calculation is completed, the calculated kvuk is calculated 1 (i) And storing the steel types, the thickness and the width into a database.
Example 2
This example 2 produced plain carbon steel Q195-W, target thickness 2.75mm, target width 1235mm.
The second steel block is the second steel block of the batch, the steel coil number is 919059402, the rough rolling outlet thickness is 42.707mm, the finish rolling inlet width is 1271.83mm, the rough rolling outlet temperature is 1082.5 ℃, the finish rolling target temperature is 880 ℃, and the specific components (wt.%) are as follows: c:0.04%, si:0.0159%, mn:0.2214%, P:0.007%, S:0.0132%, al:0.000%, cr:0.0209%, ni:0.0095%, cu:0.016%, mo:0.0067%, ti:0.0010%, V:0.0017%, nb:0.0010%, N:0.0032%, B:0%.
The self-adaptive method of the speed of each rack is calculated according to the following steps:
(1) The thickness of the rough rolling outlet is 42.707mm, and the rolling reduction (%) of each of the frames F0 to F6 is 44.6%, 46.6%, 36.9%, 26.7%, 27.6%, 21.8% and 15.8%. According to equation (4), the exit thickness (mm) of each rack is as follows:
thex(0)＝then-then*eps(0)＝42.707-42.707*44.6％＝23.6597；
thex(1)＝thex(0)-thex(0)*eps(1)＝23.6597-23.6597*46.6％＝12.6343；
thex(2)＝thex(1)-thex(1)*eps(2)＝12.6343-12.6343*36.9％＝7.9722；
thex(3)＝thex(2)-thex(2)*eps(3)＝7.9722-7.9722*26.7％＝5.8436；
thex(4)＝thex(3)-thex(3)*eps(4)＝5.8436-5.8436*27.6％＝4.2308；
thex(5)＝thex(4)-thex(4)*eps(5)＝4.2308-4.2308*21.8％＝3.3085；
thex(6)＝thex(5)-thex(5)*eps(6)＝3.3085-3.3085*15.8％＝2.7857；
i.e. the finishing mill outlet thickness heat value is 2.7857mm.
(2) The finish rolling outlet velocity was calculated to be 7.85m/s based on the rough rolling outlet temperature 1082.5 ℃, the finish rolling target temperature 880 ℃, the heat loss in the finish rolling region, and the like, namely, the finish rolling end stand outlet velocity v (6):
v(6)＝7.85m/s。
(3) According to the formulas (6) to (11), the outlet speed (m/s) of each rack is calculated sequentially from the last rack, namely:
v(5)＝thex(6)*v(6)/thex(5)＝2.7857*7.85/3.3085＝6.61；
v(4)＝thex(5)*v(5)/thex(4)＝3.3085*6.61/4.2308＝5.17；
v(3)＝thex(4)*v(4)/thex(3)＝4.2308*5.17/5.8436＝3.74；
v(2)＝thex(3)*v(3)/thex(2)＝5.8436*3.74/7.9722＝2.74；
v(1)＝thex(2)*v(2)/thex(1)＝7.9722*2.74/12.6343＝1.73；
v(0)＝thex(1)*v(1)/thex(0)＝12.6343*1.73/23.6597＝0.92。
(4) The block steel is the second block steel of the batch, the speed correction coefficient kvuk (i) is a short-term value, and the kvuk (i) value of the upper block steel is taken, namely the kvuk (i) value calculated after the rolling of the steel coil 919059401 in the embodiment 1 is finished, and the kvuk values of F0-F5 are respectively-0.018, -0.026, -0.034, -0.001, -0.031 and-0.037.
(5) According to formula (12), the corrected frame speeds (m/s) are calculated as:
v 1 (0)＝v(0)*(1.0+kvuk(0))＝0.92*(1.0-0.018)＝0.90；
v 1 (1)＝v(1)*(1.0+kvuk(1))＝1.73*(1.0-0.026)＝1.69；
v 1 (2)＝v(2)*(1.0+kvuk(2))＝2.74*(1.0-0.034)＝2.65；
v 1 (3)＝v(3)*(1.0+kvuk(3))＝3.74*(1.0-0.001)＝3.74；
v 1 (4)＝v(4)*(1.0+kvuk(1))＝5.17*(1.0-0.031)＝5.01；
v 1 (5)＝v(5)*(1.0+kvuk(1))＝6.61*(1.0-0.037)＝6.37；
specific parameters of each frame are shown in Table 3 below.
Table 3 specific process parameters for each frame in example 2
(6) Calculating the speed correction coefficient of the rolled steel
Step 1: calculation of the single-carriage speed correction coefficient kvu:
after the steel block is rolled, the actual sleeve lifting angles (°) of the 0# to 5# loops are 26, 24, 28, 23 and 27 respectively, and the difference values between the actual sleeve lifting angles and the standard sleeve lifting angles of the loops are 1, -1, 3, -2 and 2 respectively, wherein kvu is respectively taken according to the table 1:
kvu0＝-0.1；
kvu1＝0；
kvu2＝-0.3；
kvu3＝0.2；
kvu4＝0.2；
kvu5＝-0.2；
step 2: according to the formulas (13) to (18), calculating the combined speed correction coefficient kvu (i) of each rack:
kvu(5)＝kvu5＝-0.2；
kvu(4)＝kvu4+kvu5＝0.2-0.2＝0；
kvu(3)＝kvu3+kvu 4+kvu5＝0.2+0.2-0.2＝0.2；
kvu(2)＝kvu2+kvu 3+kvu4+kvu5＝-0.3+0.2+0.2-0.2＝-0.1；
kvu(1)＝kvu1+kvu2+kvu3+kvu4+kvu5＝0-0.3+0.2+0.2-0.2＝-0.1；
kvu(0)＝kvu0+kvu 1+kvu2+kvu3+kvu4+kvu5＝-0.1+0-0.3+0.2+0.2-0.2＝-0.2；
step 3: according to formula (19), a velocity correction coefficient kvuk is calculated 1 (i)：
kvuk 1 (0)＝kvuk(0)+kvu(0)/100＝-0.018+(-0.2/100)＝-0.018；
kvuk 1 (1)＝kvuk(1)+kvu(1)/100＝-0.026+(-0.1/100)＝-0.026；
kvuk 1 (2)＝kvuk(2)+kvu(2)/100＝-0.034+(-0.1/100)＝-0.034；
kvuk 1 (3)＝kvuk(3)+kvu(3)/100＝-0.001+(0.2/100)＝-0.001；
kvuk 1 (4)＝kvuk(4)+kvu(4)/100＝-0.031+(0/100)＝-0.031；
kvuk 1 (5)＝kvuk(5)+kvu(5)/100＝-0.037+(-0.2/100)＝-0.037；
After the calculation is completed, the calculated kvuk is calculated 1 (i) And storing the steel types, the thickness and the width into a database.
Example 3
This example 3 produces plain carbon steel DV19A with a target thickness of 2.45mm and a target width of 1250mm.
The steel is a new steel grade, the steel coil number of the first steel of the batch is 919412801, the rough rolling outlet thickness is 40.779mm, the finish rolling inlet width is 1286.04mm, the rough rolling outlet temperature is 944.0 ℃, the finish rolling target temperature is 830 ℃, and the specific components (wt.%) are as follows: c:0.0029%, si:3.0921%, mn:0.3138%, P:0.009%, S:0.0015%, al:0.231%, cr:0.0136%, ni:0.0047%, cu:0.0056%, mo:0.0107%, ti:0.0022%, V:0.0022%, nb:0.0021%, N:0.0017%, B:0%.
The self-adaptive method of the speed of each rack is calculated according to the following steps:
(1) The thickness of the rough rolling outlet is 40.779mm, and the rolling reduction (%) of each frame F0-F6 is 55.0%, 47.5%, 38.0%, 28.7%, 22.8%, 16.8% and 9.5%. According to equation (4), the exit thickness (mm) of each rack is as follows:
thex(0)＝then-then*eps(0)＝40.779-40.779*55.0％＝18.3506；
thex(1)＝thex(0)-thex(0)*eps(1)＝18.3506-18.3506*47.5％＝9.6340；
thex(2)＝thex(1)-thex(1)*eps(2)＝9.6340-9.6340*38.0％＝5.9731；
thex(3)＝thex(2)-thex(2)*eps(3)＝5.9731-5.9731*28.7％＝4.2588；
thex(4)＝thex(3)-thex(3)*eps(4)＝4.2588-4.2588*22.8％＝3.2878；
thex(5)＝thex(4)-thex(4)*eps(5)＝3.2878-3.2878*16.8％＝2.7355；
thex(6)＝thex(5)-thex(5)*eps(6)＝2.7355-2.7355*9.5％＝2.4756；
i.e. the finishing mill outlet thickness heat value is 2.4756mm.
(2) The finish rolling outlet velocity was calculated to be 8.03m/s based on the rough rolling outlet temperature 944.0 ℃, the finish rolling target temperature 830 ℃, the heat loss in the finish rolling region, and the like, namely, the finish rolling end stand outlet velocity v (6):
v(6)＝8.03m/s。
(3) According to the formulas (6) to (11), the outlet speed (m/s) of each rack is calculated sequentially from the last rack, namely:
v(5)＝thex(6)*v(6)/thex(5)＝2.4756*8.03/2.7355＝7.27；
v(4)＝thex(5)*v(5)/thex(4)＝2.7355*7.27/3.2878＝6.05；
v(3)＝thex(4)*v(4)/thex(3)＝3.2878*6.05/4.2588＝4.67；
v(2)＝thex(3)*v(3)/thex(2)＝4.2588*4.67/5.9731＝3.33；
v(1)＝thex(2)*v(2)/thex(1)＝5.9731*3.33/9.6340＝2.06；
v(0)＝thex(1)*v(1)/thex(0)＝9.6340*2.06/18.3506＝1.08。
(4) The steel is the first steel of the batch, and is a new steel grade, the steel grade is not in the database, and kvuk (i) takes a default value of 0.0.
(5) According to equation (12), since kvuk (i) =0, the corrected frame speeds (m/s) are calculated unchanged, that is:
v 1 (0)＝v(0)*(1.0+kvuk(0))＝1.08*(1.0+0)＝1.08；
v 1 (1)＝v(1)*(1.0+kvuk(1))＝2.06*(1.0+0)＝2.06；
v 1 (2)＝v(2)*(1.0+kvuk(2))＝3.33*(1.0+0)＝3.33；
v 1 (3)＝v(3)*(1.0+kvuk(3))＝4.67*(1.0+0)＝4.67；
v 1 (4)＝v(4)*(1.0+kvuk(1))＝6.05*(1.0+0)＝6.05；
v 1 (5)＝v(5)*(1.0+kvuk(1))＝7.27*(1.0+0)＝7.27；
specific parameters of each frame are shown in Table 4 below.
Table 4 specific process parameters for each frame in example 3
(6) Calculating the speed correction coefficient of the rolled steel
Step 1: calculation of the single-carriage speed correction coefficient kvu:
after the steel block is rolled, the actual sleeve lifting angles (°) of the 0# to 5# loops are respectively 20, 31, 37, 19, 36 and 39, and the difference values between the actual sleeve lifting angles and the standard sleeve lifting angles of the loops are respectively-5, 6, 12, -5, 11 and 14, and kvu are respectively taken according to the table 1:
kvu0＝0.9；
kvu1＝-0.8；
kvu2＝-1.4；
kvu3＝0.7；
kvu4＝-1.2；
kvu5＝-1.45；
step 2: according to the formulas (13) to (18), calculating the combined speed correction coefficient kvu (i) of each rack:
kvu(5)＝kvu5＝-1.45；
kvu(4)＝kvu4+kvu5＝-1.2-1.45＝-2.65；
kvu(3)＝kvu3+kvu 4+kvu5＝0.7-1.2-1.45＝-1.95；
kvu(2)＝kvu2+kvu 3+kvu4+kvu5＝-1.4+0.7-1.2-1.45＝-3.35；
kvu(1)＝kvu1+kvu2+kvu3+kvu4+kvu5＝-0.8-1.4+0.7-1.2-1.45＝-4.15；
kvu(0)＝kvu0+kvu 1+kvu2+kvu3+kvu4+kvu5＝0.9-0.8-1.4+0.7-1.2-1.45＝-5.05；
step 3: according to formula (19), a velocity correction coefficient kvuk is calculated 1 (i)：
kvuk 1 (0)＝kvuk(0)+kvu(0)/100＝0+(-5.05/100)＝-0.0505；
kvuk 1 (1)＝kvuk(1)+kvu(1)/100＝0+(-4.15/100)＝-0.0415；
kvuk 1 (2)＝kvuk(2)+kvu(2)/100＝0+(-3.35/100)＝-0.0335；
kvuk 1 (3)＝kvuk(3)+kvu(3)/100＝0+(-1.95/100)＝-0.0195；
kvuk 1 (4)＝kvuk(4)+kvu(4)/100＝0+(-2.65/100)＝-0.0265；
kvuk 1 (5)＝kvuk(5)+kvu(5)/100＝0+(-1.45/100)＝-0.0145；
After the calculation is completed, the calculated kvuk is calculated 1 (i) And storing the steel types, the thickness and the width into a database.
Example 4
This example 4 produced plain carbon steel DV19A, with a target thickness of 2.45mm and a target width of 1250mm.
The second steel block is the second steel block of the batch, the steel coil number is 919412802, the rough rolling outlet thickness is 40.779mm, the finish rolling inlet width is 1287.35mm, the rough rolling outlet temperature is 945.0 ℃, the finish rolling target temperature is 830 ℃, and the specific components (wt.%) are as follows: c:0.0029%, si:3.0921%, mn:0.3138%, P:0.009%, S:0.0015%, al:0.231%, cr:0.0136%, ni:0.0047%, cu:0.0056%, mo:0.0107%, ti:0.0022%, V:0.0022%, nb:0.0021%, N:0.0017%, B:0%.
The self-adaptive method of the speed of each rack is calculated according to the following steps:
(1) The thickness of the rough rolling outlet is 40.779mm, and the rolling reduction (%) of each of the frames F0 to F6 is 54.8%, 47.5%, 38.0%, 28.2%, 22.3%, 16.9% and 11.0%. According to equation (4), the exit thickness (mm) of each rack is as follows:
thex(0)＝then-then*eps(0)＝40.779-40.779*54.8％＝18.4321；
thex(1)＝thex(0)-thex(0)*eps(1)＝18.4321-18.4321*47.5％＝9.6769；
thex(2)＝thex(1)-thex(1)*eps(2)＝9.6769-9.6769*38.0％＝5.9997；
thex(3)＝thex(2)-thex(2)*eps(3)＝5.9997-5.9997*28.2％＝4.3077；
thex(4)＝thex(3)-thex(3)*eps(4)＝4.3077-4.3077*22.3％＝3.3471；
thex(5)＝thex(4)-thex(4)*eps(5)＝3.3471-3.3471*16.9％＝2.7815；
thex(6)＝thex(5)-thex(5)*eps(6)＝2.7815-2.7815*11.0％＝2.4755；
i.e. the finishing mill outlet thickness heat value is 2.4755mm.
(2) The finish rolling outlet velocity was calculated to be 8.11m/s based on the rough rolling outlet temperature 945.0 ℃, the finish rolling target temperature 830 ℃, the heat loss in the finish rolling region, and the like, namely, the finish rolling end stand outlet velocity v (6):
v(6)＝8.11m/s。
(3) According to the formulas (6) to (11), the outlet speed (m/s) of each rack is calculated sequentially from the last rack, namely:
v(5)＝thex(6)*v(6)/thex(5)＝2.4755*8.11/2.7815＝7.22；
v(4)＝thex(5)*v(5)/thex(4)＝2.7815*7.22/3.3471＝6.00；
v(3)＝thex(4)*v(4)/thex(3)＝3.3471*6.00/4.3077＝4.66；
v(2)＝thex(3)*v(3)/thex(2)＝4.3077*4.66/5.9997＝3.35；
v(1)＝thex(2)*v(2)/thex(1)＝5.9997*3.35/9.6769＝2.07；
v(0)＝thex(1)*v(1)/thex(0)＝9.6769*2.07/18.4321＝1.09。
(4) The block of steel is the second block of steel in the batch, the speed correction coefficient kvuk (i) is a short-term value, and the kvuk (i) value of the upper block of steel is taken, namely the kvuk (i) value calculated after the rolling of the steel coil 919412801 in the embodiment 3 is finished, and the kvuk values of F0-F5 are respectively-0.0505, -0.0415, -0.0335, -0.0195, -0.0265 and-0.037.
(5) According to formula (12), the corrected frame speeds (m/s) are calculated as:
v 1 (0)＝v(0)*(1.0+kvuk(0))＝1.09*(1.0-0.0505)＝1.03；
v 1 (1)＝v(1)*(1.0+kvuk(1))＝2.07*(1.0-0.0415)＝1.98；
v 1 (2)＝v(2)*(1.0+kvuk(2))＝3.35*(1.0-0.0335)＝3.24；
v 1 (3)＝v(3)*(1.0+kvuk(3))＝4.66*(1.0-0.0195)＝4.57；
v 1 (4)＝v(4)*(1.0+kvuk(1))＝6.00*(1.0-0.0265)＝5.84；
v 1 (5)＝v(5)*(1.0+kvuk(1))＝7.22*(1.0-0.037)＝6.95。
specific parameters of each frame are shown in Table 5 below.
Table 5 specific process parameters for each frame in example 4
(6) Calculating the speed correction coefficient of the rolled steel
Step 1: calculation of the single-carriage speed correction coefficient kvu:
after the steel block is rolled, the actual sleeve lifting angles (°) of the 0# to 5# loops are 24, 27, 26, 23, 27 and 24 respectively, and the difference values between the actual sleeve lifting angles and the standard sleeve lifting angles of the loops are-1, 2, 1, -2, 2 and-1 respectively, and kvu are taken according to the table 1:
kvu0＝0.0；
kvu1＝-0.2；
kvu2＝-0.1；
kvu3＝0.2；
kvu4＝-0.2；
kvu5＝0；
step 2: according to the formulas (13) to (18), calculating the combined speed correction coefficient kvu (i) of each rack:
kvu(5)＝kvu5＝0；
kvu(4)＝kvu4+kvu5＝-02+0＝-0.2；
kvu(3)＝kvu3+kvu 4+kvu5＝0.2-0.2+0＝0；
kvu(2)＝kvu2+kvu 3+kvu4+kvu5＝-0.1+0.2-0.2+0＝-0.1；
kvu(1)＝kvu1+kvu2+kvu3+kvu4+kvu5＝-0.2-0.1+0.2-0.2+0＝-0.3；
kvu(0)＝kvu0+kvu1+kvu2+kvu3+kvu4+kvu5＝0.0-0.2-0.1+0.2-0.2+0＝-0.3；
step 3: according to formula (19), a velocity correction coefficient kvuk is calculated 1 (i)：
kvuk 1 (0)＝kvuk(0)+kvu(0)/100＝-0.0505+(-0.3/100)＝-0.0535；
kvuk 1 (1)＝kvuk(1)+kvu(1)/100＝-0.0415+(-0.3/100)＝-0.0445；
kvuk 1 (2)＝kvuk(2)+kvu(2)/100＝-0.0335+(-0.1/100)＝-0.0345；
kvuk 1 (3)＝kvuk(3)+kvu(3)/100＝-0.0195+(0/100)＝-0.0195；
kvuk 1 (4)＝kvuk(4)+kvu(4)/100＝-0.0265+(-0.2/100)＝-0.0285；
kvuk 1 (5)＝kvuk(5)+kvu(5)/100＝-0.037+(0/100)＝-0.037；
After the calculation is completed, the calculated kvuk is calculated 1 (i) And storing the steel types, the thickness and the width into a database.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A dynamic control method for a loop lifting angle of a finishing mill is characterized by comprising the following steps:
s1, determining a speed correction coefficient kvuk (i) for a long genetic condition and a short genetic condition respectively:
in the pressure correction coefficient database:
1) The method for determining the speed correction coefficient under the long genetic condition comprises the following steps:
when the number of similar steels in the pressure correction coefficient database is greater than or equal to 30 steels, taking the average value of the pressure correction coefficients of the nearest 30 steels as the speed correction coefficient of the steel billet;
when the number of similar steels in the pressure correction coefficient database is smaller than 30 steel blocks, the speed correction coefficient is the average value of the pressure correction coefficients of the actual steel block number;
when the steel grade is not in the pressure correction coefficient database, the speed correction coefficient is a default value of 0.0;
2) The method for determining the speed correction coefficient under the short genetic condition comprises the following steps:
when the steel grade is unchanged or the change value of the thickness and the width is within +/-10%, the speed correction coefficient is calculated after the rolling of the upper steel is finished;
s2, correcting the speed among the frames:
and (3) adding a speed correction coefficient kvuk (i) determined in the step S1 on the basis of original speed calculation, namely controlling the speed among the frames through the following formula:
v 1 (i)＝v(i)*(1.0+kvuk(i))； (12)
wherein i represents a frame number, i=0 to 5; v (i) is the calculation speed before correction, v 1 (i) Is the corrected speed;
s3, determining a speed correction coefficient kvuk after rolling the steel billet 1 (i)：
S3-1, after each billet is rolled, the F6 stand does not carry out speed correction, and each stand from the F0 stand to the F5 stand needs to determine a single stand speed correction coefficient kvui again, i=0-5, and the specific numerical relation of kvui is shown in the following table 1;
table 1 single-carriage speed correction factor kvui
The end point values of each column in the table 1 respectively represent the upper limit value and the lower limit value of the single-frame speed correction coefficient kvui, and the upper limit value is less than or equal to the kvui and less than the lower limit value;
s3-2, determining a combined speed correction coefficient kvu (i) of each rack according to the step S3-1:
and (3) carrying out speed correction on each frame from the F5 frame to the F0 frame in sequence:
kvu(5)＝kvu5； (13)
kvu(4)＝kvu4+kvu5； (14)
kvu(3)＝kvu3+kvu4+kvu5； (15)
kvu(2)＝kvu2+kvu3+kvu4+kvu5； (16)
kvu(1)＝kvu1+kvu2+kvu3+kvu4+kvu5； (17)
kvu(0)＝kvu0+kvu1+kvu2+kvu3+kvu4+kvu5； (18)
s3-3, determining a speed correction coefficient kvuk according to the step S3-1 and the step S3-2 1 (i)：
kvuk 1 (i)＝kvuk(i)+kvu(i)/100； (19)
Wherein kvuk (i) is a velocity correction coefficient of the value obtained by rolling the billet of the block, kvuk 1 (i) The coefficient value is corrected for the calculated speed after the rolling of the steel billet is completed.
2. The dynamic control method for the loop lifting angle of the finishing mill according to claim 1, wherein the method comprises the following steps: in the step S1, the long genetic condition includes at least one of the following conditions:
1) When the steel grade of the steel billet is inconsistent with the steel grade of the upper steel block;
2) When the thickness of the steel billet is larger than +/-10% of the thickness of the upper steel billet;
3) When the width of the steel billet is larger than the width of the upper steel billet by +/-10 percent.
3. The dynamic control method for the loop lifting angle of the finishing mill according to claim 1, wherein the method comprises the following steps: will beS3, determining a speed correction coefficient kvuk after rolling the steel billet 1 (i) Establishing a database together with corresponding steel grade, thickness and width data, and storing corresponding data in the database; kvuk when the lower billet is rolled under short inheritance conditions 1 (i) The calculated value is used for correcting the lower billet; kvuk when the lower billet is rolled under long inheritance conditions 1 (i) The calculated value is used for selecting and calculating the strip steel in the same batch after rolling.
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