Methods to eliminate tail warping of cold-rolled coiled strip

Abstract

The present application relates to a method for eliminating the tail end buckling of cold-rolled coiling strip, belonging to the technical field of control method suitable for metal rolling mill. The method starts from the line of the tail end remaining length after the flying shear of the strip, adds the tracking of the tail end remaining length value after the actual production of the flying shear, keeps the coiling speed of the coiling position drum unchanged according to the original speed before the strip walks through the distance from the flying shear to the outlet to the coiling position, considers adding four compensation values in addition to the fixed tail end remaining length L to obtain the tail end remaining length setting value after the flying shear; compares the real-time tail end remaining length measured after the flying shear with the tail end remaining length setting value in real time to judge and control whether the coiling speed of the coiling position drum keeps or decelerates, so as to more accurately control that the tail end after the flying shear will not appear small lap due to the local front slow and rear fast of the tail end before passing through the coiling position, and further avoid the tail end from being coiled into the belt coiler to cause buckling.

Description

Technical Field

[0001] This invention relates to a control method for eliminating or improving the warping of the strip tail during cold rolling and coiling of thin strip steel, and belongs to the technical field of control methods applicable to metal rolling mills. Background Technology

[0002] Cold rolling exit equipment such as Figure 1 As shown, it mainly consists of a pre-shear pinch roller 1, a flying shear 2, a magnetic belt 3, an exit steering roller 4, a belt winding aid, a Carousel winding machine, and a winding position pressure roller 13. Figure 1 As shown, the Carrousel winding machine consists of a No. 1 winding drum 11 and a No. 2 winding drum 12, along with corresponding winding motors, a large turntable 6, and a large turntable drive motor. It features two cantilevered winding drums mounted on a rotatable turntable. The turntable drive motor controls the rotation of the large turntable 6, causing the two winding drums 9 and 10 to alternate between the winding assist position 11 and the winding position 12. The belt winding assist device mainly consists of a winding assist belt, a swing arm 5 and a swing arm cylinder, an upper clamping arm 8 and an upper clamping arm cylinder, and a lower clamping arm 7 and a lower clamping arm cylinder.

[0003] like Figure 1 As shown, before the flying shear 2 cuts, the belt winding aid needs to prepare for the winding of the strip steel by the drum at the winding position: 1. In order to prevent the belt winding aid arm from hitting the drum, first determine whether the upper arm 8 and the lower arm 7 of the belt winding aid are in the open limit position. If they are not in the limit position, open them to the limit position; 2. The belt winding aid swing arm begins to rise to the limit position; 3. The upper and lower arms of the belt winding aid close. At this time, the upper and lower arms just hold the drum at the winding position, and the belt winding aid preparation is completed.

[0004] like Figure 1 As shown, the preparation work before the flying shear 2 shears is as follows: 1. Determine whether drum 1# 9 or drum 2# 10 is in the coiling position 11. The drum in the coiling position 11 expands. 2. The coiling pressure roller 13 presses down to hold the strip on the coiling position 10 drum, preventing the steel coil from collapsing due to the strip tail losing tension during shearing. 3. The lower roller of the pre-shear pinch roller starts to rotate and, when it is synchronized with the exit strip speed, the lower roller of the pre-shear pinch roller starts to rise and clamp the strip. 4. The drum in the coiling position 11 starts to run and maintains synchronization with the exit strip speed. 5. The electromagnet of the magnetic belt 3 is energized, and the magnetic belt drive motor starts to rotate, so that the speed of the magnetic belt 3 is synchronized with the exit strip speed. 6. The flying shear 2 is ready to shear and waits for shearing.

[0005] like Figure 2As shown, after the flying shear 2 cuts, the strip is divided into two parts between A and B, namely, the forward coil strip and the subsequent coil strip. The A end of the subsequent coil strip is called the head, and the B end of the forward coil strip is called the tail. Since the head A end has not entered the drum at this time and is in a free state, the tension between the head A end and the drum of the auxiliary winding position 11 is zero. In order to help the head A end enter the drum of the auxiliary winding position 11 smoothly, on the one hand, the pre-shear pinch roller provides the forward driving force for the head A end, and on the other hand, the head A end is attracted by the electromagnet of the magnetic belt and moves forward with the rotation of the magnetic belt 3.

[0006] like Figure 1 , 2 As shown, drums 9 and 10 alternately switch operation: Assume that drum 1# is currently in the winding assist position 11 and drum 2# is in the winding position 12. When the belt head A is fed into the belt winding assist inlet by the driving force of the shearing pinch roller and the magnetic belt, the friction between the belt head A and the winding assist belt enters the drum 1# in the winding assist position 11 for winding. When a certain number of layers are wound and the tension is established, the large turntable 6 starts to rotate, so that drum 1# reaches the winding position 12, and at the same time drum 2# reaches the winding assist position 11. When the coil weight at winding position 12 reaches the set weight, the flying shear 2 cuts the strip steel, dividing it into two parts: the forward strip steel and the subsequent strip steel. The subsequent strip steel will begin winding the next coil at the No. 2 drum 10 at the auxiliary winding position 11, while the No. 1 drum 9 completes the winding of the tail of the forward strip steel and positions the tail of the strip steel at the set position, that is, positions the tail of the thin strip steel at the seven o'clock position. Finally, the coil trolley completes the unwinding of the coil from the No. 1 drum 9 at winding position 12. After the steel coil on drum 1 (9) is unwound, and drum 2 (10) at winding aid position 11 has wound a certain number of layers and established tension, the large turntable 6 starts rotating again, causing drum 2 (10) to reach winding position 12. Simultaneously, drum 1 (9) reaches winding aid position 11. When the weight of the steel coil at winding position 12 reaches the set weight, the flying shear 2 cuts the strip. Subsequent strip will then be wound starting from drum 1 (9) at winding aid position 11, while drum 2 (10) completes winding the tail of the preceding strip, positioning the tail at the 7 o'clock position. Finally, the steel coil trolley unwinds the steel coil on drum 2 (10) at winding position 12. This cycle repeats continuously, alternating between drums 1 (9) and 2 (10) for winding.

[0007] However, as Figure 3As shown, the following problems exist in actual production: After the flying shear 2 cuts, the tail strip is wound into the belt winding aid, causing the strip tail to warp. Since a label with strip information needs to be affixed to the tail of the thin strip, the warping of the strip tail can easily cause the label to fall off, making it impossible for the next unit to verify the strip information; in addition, the warping of the strip tail causes the outer ring of the crane to loosen or detach during the steel coil transportation process, resulting in quality loss; at the same time, it is not conducive to the threading of the next unit, which can easily cause threading failure and machine shutdown. Summary of the Invention

[0008] The technical problem to be solved by this invention is to improve or even eliminate the warping of the tail strip after flying shearing.

[0009] The technical solution proposed by this invention to solve the above-mentioned technical problems is: a method for eliminating warping at the tail of cold-rolled coiled strip, comprising the following steps:

[0010] 1) Calculate the remaining length L of the belt tail after the flying shear is fixed according to the following formula (1).

[0011] L=l1+l2+al3 (1),

[0012] In formula (1), l1 is the distance from the flying shear to the center of the exit guide roller, l2 is the arc length of the strip contacting the exit guide roller, l3 is the distance between the center of the exit guide roller and the center of the winding drum mandrel at the winding position, and a is the ratio of the distance between the auxiliary winding position and the center of the exit guide roller to l3.

[0013] 2) Calculate the first compensation value Δl1 for the remaining length of the band caused by the sampling time according to the following formula (2).

[0014] Δl1=V0×t0 (2),

[0015] In equation (2), t0 is the sampling time, and V0 is the rotational speed of the auxiliary winding drum;

[0016] 3) Calculate the second compensation value Δl2 for the remaining tape length caused by the change in the winding speed of the winding drum at the winding position. The fixed winding speed at the winding position corresponds to the following values ​​for the second compensation value Δl2.

[0017] When the winding speed of the winding drum is 60 meters per minute, the second compensation value Δl2 is taken as 290 mm.

[0018] When the winding speed of the winding drum is 110 m / min, the second compensation value Δl2 is taken as 270 mm.

[0019] When the winding speed of the winding drum is 160 m / min, the second compensation value Δl2 is taken as 230 mm.

[0020] When the winding speed of the winding position drum is 210 m / min, the second compensation value Δl2 is 200 mm.

[0021] When the winding speed of the winding position drum is other values ​​between 60 m / min and 210 m / min, the corresponding second compensation value Δl2 is calculated using the interpolation function of the linear interpolation method.

[0022] 4) Calculate the third compensation value Δl3 for the remaining strip tail length caused by the change in strip diameter on the winding drum at the winding position. The fixed value of the strip diameter on the winding drum at the winding position and the corresponding value of the third compensation value Δl3 are as follows:

[0023] When the strip diameter on the winding drum is 550mm, the third compensation value Δl3 is taken as 130mm.

[0024] When the strip diameter on the winding drum is 600mm, the third compensation value Δl3 is taken as 140mm.

[0025] When the strip diameter on the winding drum is 800mm, the third compensation value Δl3 is taken as 160mm.

[0026] When the strip diameter on the winding drum is 1000mm, the third compensation value Δl3 is taken as 190mm.

[0027] When the strip diameter on the winding drum is 1200mm, the third compensation value Δl3 is taken as 230mm.

[0028] When the diameter of the strip on the winding drum is 1400mm, the third compensation value Δl3 is 250mm.

[0029] When the diameter of the strip on the winding drum is between 550mm and 1400mm, the corresponding third compensation value Δl3 is calculated using an interpolation function.

[0030] 5) Calculate the fourth compensation value Δl4 for the remaining strip length caused by the change in the thickness of the exported strip.

[0031] When the thickness of the exported strip steel is greater than 0.3 mm, the fourth compensation value Δl4 is taken as 20 mm.

[0032] When the thickness of the exported strip is less than or equal to 0.3 mm, the fourth compensation value Δl4 is taken as 30 mm;

[0033] 6) Calculate the set value L0 of the remaining tail length after the flying shear according to the following formula (3).

[0034] L0=L+Δl1+Δl2+Δl3+Δl4 (3),

[0035] 7) In actual production, the real-time remaining length L1 of the belt tail is dynamically measured by the encoder on the take-up drum after the flying shear.

[0036] When L1≥L0, the winding speed of the winding position drum remains unchanged at the original speed;

[0037] When L1 < L0, start at 1 m / s 2 The slope reduces the winding speed of the winding position.

[0038] Analysis of the causes of tail warping after cold rolling exit shearing: Based on on-site investigation, such as... Figure 2 As shown, after the cold rolling exit flying shear, the coil at coiling position 12 usually begins to decelerate immediately, at which point the strip coiling speed at coiling position 12 can begin to decrease; as Figure 3 As shown, the tail section B of the strip is magnetically attracted to the magnetic belt 3, and the running speed of the magnetic belt 3 has not decreased. That is, the speed of the tail section B of the strip is greater than the speed of the drum at the winding position 12. However, the tail section C of the strip, which has already left the magnetic belt 3, is synchronized with the speed of the drum at the winding position 12. This causes the tail section C of the strip to be slower in the front and faster in the back, resulting in a small loop between the tail section B and the tail section C. Therefore, the tail section B of the strip is not pulled away from the winding aid position 11 in time, but is instead wound into the belt winding aid, thus causing the strip tail to warp.

[0039] The beneficial effects of this invention are as follows: Based on the above analysis of the causes of strip tail warping, this invention starts from the remaining length of the strip tail after the flying shear. In actual production, after the flying shear, the remaining length of the strip tail is tracked. Before the strip has traveled the distance from the flying shear to the exit to the winding aid position 11, the winding speed of the winding drum at the winding position 12 is kept constant at the original speed. This ensures that the strip tail after the flying shear will not experience the small loop caused by the local slow front and fast back of the strip tail as analyzed above before passing the winding aid position 11, thereby avoiding the strip tail being wound into the belt winding aid and causing warping. Furthermore, due to various factors (variations in sampling time, winding speed of the winding drum at position 12, winding diameter of the winding drum at position 12, and thickness of the strip at the exit), the remaining strip tail length after the flying shear in actual production is not just a fixed distance between the flying shear and the winding drum at the winding position. Therefore, in addition to the fixed remaining strip tail length L, four compensation values ​​(Δl1, Δl2, Δl3, and Δl4) are added to obtain the set value L0 for the remaining strip tail length after the flying shear. This allows for real-time comparison between the measured real-time remaining strip tail length L1 and the set value L0 to determine and control whether the winding speed of the winding drum at position 12 should be maintained or reduced. This more precisely controls the strip tail after the flying shear to avoid the small loops caused by the localized slow-to-fast speed at the end of the strip tail, as analyzed above, before passing the winding aid position, and prevents the strip tail from being caught in the belt winding aid and causing warping.

[0040] Furthermore, in step 3), the relationship between the winding speed of the winding drum at the winding position and the second compensation value Δl2 follows the interpolation function of the linear interpolation method; in step 4), the relationship between the strip diameter on the winding drum at the winding position and the third compensation value Δl3 follows the interpolation function of the linear interpolation method.

[0041] Furthermore, the value of 'a' ranges from 0.3 to 1. Attached Figure Description

[0042] The method for eliminating tail warping of cold-rolled coiled strip according to the present invention will be further described below with reference to the accompanying drawings.

[0043] Figure 1 This is a schematic diagram of the cold rolling mill outlet equipment layout.

[0044] Figure 2 This is a schematic diagram of the strip steel after being cut by flying shear.

[0045] Figure 3 This is a schematic diagram showing the tail of the strip being wound into the winding belt after the flying shear.

[0046] Figure 4 This is a schematic diagram showing the remaining length of the tail after the flying shear is fixed. Detailed Implementation

[0047] Example 1:

[0048] This embodiment describes a method for eliminating tail warping in cold-rolled strip. Taking a single cold-rolling coiling process at a steel plant as an example, the distance l1 from the flying shear to the center of the exit guide roller is 10 meters, the arc length l2 of the strip contacting the exit guide roller is 0.55 meters, the distance l3 from the center of the exit guide roller to the center of the coiling drum mandrel is 3.2 meters, the coiling drum speed is 110 meters / minute, the coiling drum diameter is 1000 mm, the exit strip thickness is 0.2 mm, and the rotational speed V0 of the auxiliary coiling drum is 120 meters / minute. The method includes the following steps:

[0049] 1) Calculate the remaining length L of the belt tail after the flying shear is fixed according to the following formula (1).

[0050] L=l1+l2+al3 (1),

[0051] In formula (1), such as Figure 4 As shown, l1 is the distance from the flying shear to the center of the exit guide roller, l2 is the arc length of the strip contacting the exit guide roller, l3 is the distance between the center of the exit guide roller and the center of the winding drum mandrel at the winding position, and a is the ratio of the distance between the auxiliary winding position and the center of the exit guide roller to l3. In this embodiment, a is 0.5.

[0052] The calculated value is L = l1 + l2 + 0.5l3 = 12150 mm.

[0053] 2) Calculate the first compensation value Δl1 for the remaining length of the band caused by the sampling time according to the following formula (2).

[0054] Δl1=V0×t0 (2),

[0055] In equation (2), t0 is the sampling time, and V0 is the rotational speed of the auxiliary winding drum;

[0056] In this embodiment, t0 is 0.02 seconds and V0 is 120 meters per minute.

[0057] The calculated value is Δl1 = 40 mm.

[0058] 3) Calculate the second compensation value Δl2 for the remaining tape length caused by the change in the winding speed of the winding drum at the winding position.

[0059] When the winding speed of the winding drum is 60 m / min, the second compensation value Δl2 is taken as 290 mm.

[0060] When the winding speed of the winding drum is 110 m / min, the second compensation value Δl2 is taken as 270 mm.

[0061] When the winding speed of the winding drum is 160 m / min, the second compensation value Δl2 is taken as 230 mm.

[0062] When the winding speed of the winding position drum is 210 m / min, the second compensation value Δl2 is taken as 200 mm.

[0063] The functional relationship between the winding speed of the winding position and the second compensation value Δl2 is an interpolation function (FG) implemented by linear interpolation. The correspondence between the two is shown in Table 1:

[0064] Table 1

[0065]

[0066] In this embodiment, since the winding speed is 110 meters per minute, the second compensation value Δl2 is taken as 270 mm.

[0067] 4) Calculate the third compensation value Δl3 for the remaining strip tail length caused by the change in strip diameter on the winding drum at the winding position.

[0068] When the strip diameter on the winding drum is 550mm, the third compensation value Δl3 is taken as 130mm.

[0069] When the strip diameter on the winding drum is 600mm, the third compensation value Δl3 is taken as 140mm.

[0070] When the strip diameter on the winding drum is 800mm, the third compensation value Δl3 is taken as 160mm.

[0071] When the strip diameter on the winding drum is 1000mm, the third compensation value Δl3 is taken as 190mm.

[0072] When the strip diameter on the winding drum is 1200mm, the third compensation value Δl3 is taken as 230mm.

[0073] When the diameter of the strip on the winding drum is 1400mm, the third compensation value Δl3 is 250mm.

[0074] The strip diameter on the winding drum is a constantly changing value, and its correspondence with the third compensation value Δl3 is also achieved through an interpolation function (FG) using linear interpolation, as shown in Table 1:

[0075] Table 2

[0076]

[0077]

[0078] In this embodiment, since the diameter of the strip on the winding drum is 1000mm, the third compensation value Δl3 is taken as 190mm.

[0079] 5) Calculate the fourth compensation value Δl4 for the remaining strip tail length caused by the change in the thickness of the exported strip.

[0080] When the thickness of the exported strip steel is greater than 0.3 mm, the fourth compensation value Δl4 is taken as 20 mm.

[0081] When the thickness of the exported strip is less than or equal to 0.3 mm, the fourth compensation value Δl4 is taken as 30 mm;

[0082] In this embodiment, since the thickness of the export strip is 0.2mm, and 0.2mm < 0.3mm, the fourth compensation value Δl4 is taken as 30mm.

[0083] 6) Calculate the set value L0 of the remaining tail length after the flying shear according to the following formula (3).

[0084] L0=L+Δl1+Δl2+Δl3+Δl4 (4);

[0085] In this embodiment, L0 was calculated to be 12150 + 40 + 230 + 190 + 30 = 12640 mm.

[0086] 7) In actual production, the real-time remaining length L1 of the belt tail is dynamically measured by the encoder on the take-up drum after the flying shear.

[0087] When L1≥L0, the winding speed of the winding position drum remains unchanged at the original speed;

[0088] When L1 < L0, start at 1 m / s 2 The slope reduces the winding speed of the winding position.

[0089] Example 2:

[0090] This embodiment describes a method for eliminating tail warping in cold-rolled strip. Taking a single cold-rolling process at a steel plant as an example, the distance l1 from the flying shear to the center of the exit guide roller is 10 meters, the arc length l2 of the strip contacting the exit guide roller is 0.55 meters, the distance l3 from the center of the exit guide roller to the center of the coiling drum mandrel is 3.2 meters, the coiling drum speed is 80 meters / minute, the coiling drum diameter is 1100 mm, the exit strip thickness is 0.18 mm, and the auxiliary coiling drum rotation speed V0 is 85 meters / minute. The method includes the following steps:

[0091] 1) Calculate the remaining length L of the belt tail after the flying shear is fixed according to the following formula (1).

[0092] L=l1+l2+al3 (1),

[0093] In formula (1), such as Figure 4 As shown, l1 is the distance from the flying shear to the center of the exit guide roller, l2 is the arc length of the strip contacting the exit guide roller, l3 is the distance between the center of the exit guide roller and the center of the winding drum mandrel at the winding position, and a is the ratio of the distance between the auxiliary winding position and the center of the exit guide roller to l3. In this embodiment, a is taken as 0.9. After calculation, L = l1 + l2 + 0.9l3 = 13430mm.

[0094] 2) Calculate the first compensation value Δl1 for the remaining length of the band caused by the sampling time according to the following formula (2).

[0095] Δl1=V0×t0 (2),

[0096] In equation (2), t0 is the sampling time, and V0 is the rotational speed of the auxiliary winding drum;

[0097] In this embodiment, t0 is 0.02 seconds and V0 is 85 meters per minute.

[0098] The calculated value is approximately Δl1≈28.3mm.

[0099] 3) Calculate the second compensation value Δl2 for the remaining tape length caused by the change in the winding speed of the winding drum at the winding position.

[0100] When the winding speed of the winding drum is 60 m / min, the second compensation value Δl2 is taken as 290 mm.

[0101] When the winding speed of the winding drum is 110 m / min, the second compensation value Δl2 is taken as 270 mm.

[0102] When the winding speed of the winding drum is 160 m / min, the second compensation value Δl2 is taken as 230 mm.

[0103] When the winding speed of the winding position drum is 210 m / min, the second compensation value Δl2 is taken as 200 mm.

[0104] The relationship between the winding speed of the winding position and the second compensation value Δl2 follows the interpolation function (FG) implemented by linear interpolation, as shown in Table 3:

[0105] Table 3

[0106]

[0107] In this embodiment, since the winding speed is 80 meters per minute, the second compensation value Δl2 is calculated using a linear fitting interpolation function as follows:

[0108] 290-Δl2 / 80-60=290-270 / 110-60,Δl2=290-8=282mm,therefore, the second compensation value Δl2 is taken as 282mm.

[0109] 4) Calculate the third compensation value Δl3 for the remaining strip tail length caused by the change in strip diameter on the winding drum at the winding position.

[0110] When the strip diameter on the winding drum is 550mm, the third compensation value Δl3 is taken as 130mm.

[0111] When the strip diameter on the winding drum is 600mm, the third compensation value Δl3 is taken as 140mm.

[0112] When the strip diameter on the winding drum is 800mm, the third compensation value Δl3 is taken as 160mm.

[0113] When the strip diameter on the winding drum is 1000mm, the third compensation value Δl3 is taken as 190mm.

[0114] When the strip diameter on the winding drum is 1200mm, the third compensation value Δl3 is taken as 230mm.

[0115] When the diameter of the strip on the winding drum is 1400mm, the third compensation value Δl3 is 250mm.

[0116] The correspondence between the strip diameter on the winding drum and the third compensation value Δl3 follows the interpolation function (FG) implemented by linear interpolation, as shown in Table 4:

[0117] Table 4

[0118]

[0119] In this embodiment, since the strip diameter on the winding drum is 1100mm, the following calculation is performed using a linear fitting interpolation function:

[0120] Δl3-190 / 1100-1000=230-190 / 1200-1000,Δl3=190+20=210, therefore the third compensation value Δl3 is taken as 210mm.

[0121] 5) Calculate the fourth compensation value Δl4 for the remaining strip length caused by the change in the thickness of the exported strip.

[0122] When the thickness of the exported strip steel is greater than 0.3 mm, the fourth compensation value Δl4 is taken as 20 mm.

[0123] When the thickness of the exported strip is less than or equal to 0.3 mm, the fourth compensation value Δl4 is taken as 30 mm;

[0124] In this embodiment, since the thickness of the export strip is 0.18mm, and 0.18mm < 0.3mm, the fourth compensation value Δl4 is taken as 30mm.

[0125] 6) Calculate the remaining tail length setting value L0 after the flying shear according to the following formula (3).

[0126] L0=L+Δl1+Δl2+Δl3+Δl4 (4);

[0127] In this embodiment, L0 is calculated to be 13430 + 28.3 + 282 + 210 + 30 = 13980.3 mm.

[0128] 7) In actual production, the real-time remaining length L1 of the belt tail is dynamically measured by the encoder on the take-up drum after the flying shear.

[0129] When L1≥L0, the winding speed of the winding position drum remains unchanged at the original speed;

[0130] When L1 < L0, start at 1 m / s 2 The slope reduces the winding speed of the winding position.

[0131] The above description is only a preferred embodiment of the present invention, but the present invention is not limited thereto. All equivalent substitutions or modifications made to the concept and technical solutions of the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for eliminating warping at the tail end of cold-rolled coiled strip, characterized in that... Includes the following steps: 1) Calculate the remaining length L of the belt tail after the flying shear is fixed according to the following formula (1). L=l1+l2+al3 (1), In formula (1), l1 is the distance from the flying shear to the center of the exit guide roller, l2 is the arc length of the strip contacting the exit guide roller, l3 is the distance between the center of the exit guide roller and the center of the winding drum mandrel at the winding position, and a is the ratio of the distance between the auxiliary winding position and the center of the exit guide roller to l3. 2) Calculate the first compensation value Δl1 for the remaining length of the band caused by the sampling time according to the following formula (2). Δl1=V0×t0 (2), In equation (2), t0 is the sampling time, and V0 is the rotational speed of the auxiliary winding drum; 3) Calculate the second compensation value Δl2 for the remaining tape length caused by the change in the winding speed of the winding drum at the winding position. The fixed winding speed at the winding position corresponds to the following values ​​for the second compensation value Δl2. When the winding speed of the winding drum is 60 meters per minute, the second compensation value Δl2 is taken as 290 mm. When the winding speed of the winding drum is 110 m / min, the second compensation value Δl2 is taken as 270 mm. When the winding speed of the winding drum is 160 m / min, the second compensation value Δl2 is taken as 230 mm. When the winding speed of the winding position drum is 210 m / min, the second compensation value Δl2 is 200 mm. When the winding speed of the winding position drum is other values ​​between 60 m / min and 210 m / min, the corresponding second compensation value Δl2 is calculated using the interpolation function of the linear interpolation method. 4) Calculate the third compensation value Δl3 for the remaining strip tail length caused by the change in strip diameter on the winding drum at the winding position. The fixed value of the strip diameter on the winding drum at the winding position and the corresponding value of the third compensation value Δl3 are as follows: When the strip diameter on the winding drum is 550mm, the third compensation value Δl3 is taken as 130mm. When the strip diameter on the winding drum is 600mm, the third compensation value Δl3 is taken as 140mm. When the strip diameter on the winding drum is 800mm, the third compensation value Δl3 is taken as 160mm. When the strip diameter on the winding drum is 1000mm, the third compensation value Δl3 is taken as 190mm. When the strip diameter on the winding drum is 1200mm, the third compensation value Δl3 is taken as 230mm. When the diameter of the strip on the winding drum is 1400mm, the third compensation value Δl3 is 250mm. When the diameter of the strip on the winding drum is between 550mm and 1400mm, the corresponding third compensation value Δl3 is calculated using an interpolation function. 5) Calculate the fourth compensation value Δl4 for the remaining strip length caused by the change in the thickness of the exported strip. When the thickness of the exported strip steel is greater than 0.3 mm, the fourth compensation value Δl4 is taken as 20 mm. When the thickness of the exported strip is less than or equal to 0.3 mm, the fourth compensation value Δl4 is taken as 30 mm; 6) Calculate the set value L0 of the remaining tail length after the flying shear according to the following formula (3). L0=L+Δl1+Δl2+Δl3+Δl4 (3), 7) In actual production, the real-time remaining length L1 of the belt tail is dynamically measured by the encoder on the take-up drum after the flying shear. When L1≥L0, the winding speed of the winding position drum remains unchanged at the original speed; When L1 < L0, start at 1 m / s 2 The slope reduces the winding speed of the winding position.

2. The method for eliminating tail warping of cold-rolled coiled strip according to claim 1, characterized in that: The relationship between the winding speed of the winding drum at the winding position in step 3) and the second compensation value Δl2 follows the interpolation function of the linear interpolation method; the relationship between the strip diameter on the winding drum at the winding position in step 4) and the third compensation value Δl3 follows the interpolation function of the linear interpolation method.

3. The method for eliminating tail warping of cold-rolled coiled strip according to claim 1 or 2, characterized in that: The value of 'a' ranges from 0.3 to 1.

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