CN-117548496-B - Method for eliminating warping of tail of cold-rolled coiled strip steel

Abstract

The invention relates to a method for eliminating tail warpage of cold-rolled coiled strip steel, and belongs to the technical field of control methods applicable to metal rolling mills. The method starts from a line of the residual length of the strip steel after being flying sheared, tracks the value of the residual length of the strip steel after the flying sheared is actually produced, the winding speed of a winding drum at the winding position is kept unchanged according to the original speed before the strip steel runs out from the flying sheared to the outlet to the winding assisting position, four compensation values are added to obtain a set value of the residual length of the strip steel after the flying sheared, the real-time comparison is carried out between the measured residual length of the strip steel and the set value of the residual length of the strip steel after the flying sheared according to the measured real-time residual length of the strip steel, and whether the winding speed of the winding drum at the winding position is kept or decelerated is judged and controlled, so that the small loop generated by the fact that the strip tail is locally slowed down before the strip tail passes through the winding assisting position is controlled more accurately, and the strip tail is prevented from being wound into a warp by a belt winding assisting device.

Inventors

• YAN JIAGEN
• WANG JINHUA
• LIU YUNFENG
• JIA YINFANG
• ZHOU LIPING
• GAO HUI

Assignees

• 上海梅山钢铁股份有限公司

Dates

Publication Date

20260505

Application Date

20220803

Claims (3)

1. 1. A method for eliminating the warping of the tail of cold-rolled coiled strip steel is characterized by comprising the following steps: 1) Calculating the remaining length L of the fixed belt tail after the flying shears according to the following formula (1), L=l 1 +l 2 +al 3 (1), In the formula (1), l 1 is the distance from the flying shear to the center of the outlet steering roller, l 2 is the arc length of the contact between the strip steel and the outlet steering roller, l 3 is the distance between the center of the outlet steering roller and the center of the mandrel of the winding drum at the winding position, and a is the proportion of the distance between the winding assisting position and the center of the outlet steering roller to l 3 ; 2) A first compensation value deltal 1 of the remaining length of the tape tail due to the sampling time is calculated according to the following formula (2), Δl 1 ＝V 0 ×t 0 (2), In the formula (2), t 0 is sampling time, and V 0 is the rotating speed of the winding-assisting position winding drum; 3) Calculating a second compensation value Deltal 2 of the residual length of the tape tail caused by the change of the coiling speed of the coiling block reel, wherein the fixed value of the coiling speed of the coiling block reel, namely the corresponding second compensation value Deltal 2 is known as follows, When the coiling speed of the coiling position winding drum is 60 meters/min, the second compensation value Deltal 2 takes 290mm, When the coiling speed of the coiling position winding drum is 110 meters/min, the second compensation value Deltal 2 takes 270mm, When the coiling speed of the coiling position winding drum is 160 meters/min, the second compensation value Deltal 2 takes 230mm, When the coiling speed of the coiling block reel is 210 meters/min, the second compensation value Deltal 2 takes 200mm; When the coiling speed of the coiling position winding drum is from 60 meters/min to other numerical values between 210 meters/min, calculating to obtain a value of a corresponding second compensation value Delhi 2 by adopting an interpolation function of a linear interpolation method; 4) Calculating a third compensation value Deltal 3 of the surplus length of the strip tail caused by the change of the strip coil diameter on the coiling block, knowing the fixed value of the strip coil diameter on the coiling block and the value of the corresponding third compensation value Deltal 3 as follows, When the strip steel winding diameter on the winding position winding drum is 550mm, the third compensation value Deltal 3 takes 130mm, When the rolling diameter of the strip steel on the coiling block is 600mm, the third compensation value Deltal 3 is 140mm, When the strip steel winding diameter on the winding position winding drum is 800mm, the third compensation value Deltal 3 is 160mm, When the rolling diameter of the strip steel on the coiling block is 1000mm, the third compensation value Delhi 3 takes 190mm, When the strip steel winding diameter on the winding position winding drum is 1200mm, the third compensation value Delhi 3 takes 230mm, When the strip steel winding diameter on the winding position winding drum is 1400mm, taking a third compensation value Delhi 3 to 250mm; When the rolling diameter of the strip steel on the coiling position winding drum is from 550mm to 1400mm, calculating by adopting an interpolation function to obtain a value of a corresponding third compensation value Delhi 3 ; 5) Calculating a fourth compensation value Deltal of the remaining length of the strip tail caused by the change of the thickness of the outlet strip steel 4 When the thickness of the outlet strip steel is larger than 0.3mm, the fourth compensation value Deltal 4 is 20mm, When the thickness of the outlet strip steel is less than or equal to 0.3mm, the fourth compensation value Deltal 4 is 30mm; 6) Calculating a set value L0 of the residual length of the belt tail after flying shears according to the following formula (3), L0=L+Δl 1 +Δl 2 +Δl 3 +Δl 4 (3), 7) In actual production, the real-time belt tail residual length L1 dynamically measured by an encoder on a coiling position winding drum after flying shears, When L1 is more than or equal to L0, keeping the coiling speed of the coiling block at the coiling position unchanged according to the original speed; When L1< L0, the reel-up speed of the reel-up position is reduced by a slope of 1m/s 2 .
2. 2. The method of eliminating tail warpage of cold rolled coiled strip steel according to claim 1, wherein the corresponding relation between the coiling speed of the coiling block in the step 3) and the second compensation value Delhi 2 is an interpolation function of a linear interpolation method, and the corresponding relation between the coiling diameter of the coiled strip steel on the coiling block in the step 4) and the third compensation value Delhi 3 is an interpolation function of a linear interpolation method.
3. 3. The method for eliminating tail warpage of cold-rolled coiled strip steel according to claim 1 or 2, wherein the value range of a is 0.3-1.

Description

Method for eliminating warping of tail of cold-rolled coiled strip steel Technical Field The invention relates to a control method for eliminating or improving warping of a strip steel tail part generated during cold rolling and coiling of thin strip steel, and belongs to the technical field of control methods applicable to metal rolling mills. Background The cold rolling outlet equipment is shown in fig. 1, and mainly comprises a pinch roll 1 before shearing, a flying shear 2, a magnetic belt 3, an outlet steering roll 4, a belt winding aid, a Karussell winding machine, a winding position pressing roll 13 and the like. As shown in figure 1, the Karussell coiling machine consists of a 1# coiling block 11, a 2# coiling block 12, a corresponding coiling motor, a large rotary table 6, a large rotary table driving motor and the like, wherein two cantilever coiling blocks are arranged on one rotatable large rotary table, and the rotary table driving motor is used for controlling the rotation of the large rotary table 6, so that the two coiling blocks 9 and 10 respectively perform alternating switching work at a coiling assisting position 11 and a coiling position 12. The belt winding assisting device mainly comprises a winding assisting belt, a swing arm 5, a swing arm oil cylinder, an upper arm holding 8, an upper arm holding oil cylinder, a lower arm holding 7 and a lower arm holding oil cylinder. In order to prevent the arm of the belt winding aid from striking the winding drum, whether the upper arm 8 and the lower arm 7 of the belt winding aid are opened to limit positions or not is judged, 2, the swing arm of the belt winding aid starts to rise to limit positions, 3, the upper arm and the lower arm of the belt winding aid are closed, and at the moment, the upper arm and the lower arm just hold the winding drum at the winding aid position, and the winding aid winding preparation work of the belt winding aid is completed. As shown in figure 1, the preparation work before shearing of the flying shears 2 comprises the steps of 1 judging whether a 1# winding drum 9 is at a winding assisting position 11 or a 2# winding drum 10 is at the winding assisting position 11, and the winding drum at the winding assisting position 11 is expanded, 2, pressing down a strip steel on the winding drum at the winding position 10 by a winding position pressing roller 13 to prevent a steel coil from collapsing caused by tail tension loss during strip steel shearing, 3, starting to rotate a lower roll of a front pinch roll, starting to lift and clamp the strip steel when the lower roll of the front pinch roll is synchronous with the speed of an outlet strip steel, 4, starting to operate the winding drum at the winding assisting position 11 and keeping synchronous with the speed of the outlet strip steel, 5, powering an electromagnet of a magnetic belt 3, starting to rotate a magnetic belt transmission motor, and synchronizing the speed of the magnetic belt 3 with the speed of the outlet strip steel, and 6, preparing the shearing of the flying shears 2 to wait for shearing; As shown in fig. 2, after the flying shears 2 shear, the strip steel is split into two parts between AB, namely, a forward rolled strip steel and a subsequent rolled strip steel, the end of the subsequent rolled strip steel a is called a head, the end of the forward rolled strip steel B is called a tail, and since the end of the head a does not enter the winding drum at the moment and is in a free state, the tension between the head a and the winding drum at the winding assisting position 11 is zero, so as to assist the head a to smoothly enter the winding drum at the winding assisting position 11, on one hand, the front shearing pinch roll provides a forward driving force for the head a, and on the other hand, the head a is attracted by the electromagnet magnetic force of the magnetic belt and moves forward along with the rotation of the magnetic belt 3. As shown in fig. 1 and 2, the reels 9 and 10 alternately switch to work, wherein the current 1# reel 9 is arranged at a winding position 11, the 2# reel 10 is arranged at a winding position 12, when the driving force of the belt head A, the shearing pinch roller and the magnetic belt is sent to the entrance of the belt winding aid, the friction force between the belt head A and the winding aid belt enters the 1# reel 9 at the winding aid position 11 for winding, and after a certain winding layer is wound and tension is established, the large turntable 6 starts to rotate, so that the 1# reel 9 reaches the winding position 12, and the 2# reel 10 reaches the winding aid position 11. When the coil weight of the steel coil at the coiling position 12 reaches the set weight, the flying shear 2 cuts off the steel strip, the steel strip is divided into a forward steel strip and a subsequent steel strip, the subsequent steel strip starts coiling the next steel coil at the No. 2 winding drum 10 at the coil assisting posit