Method for adjusting necking amount of strip steel in continuous annealing process
By constructing a discrete model of strip steel and adjusting the stress inside the furnace, the necking amount of strip steel in the continuous annealing unit was precisely controlled, solving the problem of strip steel width control, improving the yield and reducing additional costs, and achieving efficient width control.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BAOSTEEL ZHANJIANG IRON & STEEL CO LTD
- Filing Date
- 2025-12-01
- Publication Date
- 2026-04-21
AI Technical Summary
In existing technologies, it is difficult to control the strip width precisely, resulting in low yield and increased additional costs. In particular, in continuous annealing units, the correction rate for width discrepancies is high, which affects economic efficiency.
A discrete model of the strip between a single pair of furnace rolls was constructed, on-site data from the continuous annealing unit was collected, the strip necking amount was calculated, and the necking amount of the strip was precisely controlled by adjusting the stress step length in the furnace, thereby reducing the occurrence of non-compliant width.
It improves the accuracy of strip width, increases production efficiency, reduces rework due to width discrepancies, lowers additional costs, and improves the yield and economic benefits of the unit.
Smart Images
Figure CN121892518A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of continuous annealing technology, and more specifically to a method for adjusting the necking amount of strip during continuous annealing. Background Technology
[0002] At present, the requirement for strip width accuracy is mainly achieved by designing a wider width allowance and combining it with shearing operations. It is closely related to the widening and necking of strip production. The equipment involved includes cold rolling mills, continuous annealing mills, etc., which results in many factors affecting strip width control. It is necessary to achieve precise control of strip width through a consistent process. Therefore, strip width control has always been a key focus for on-site technicians of various units.
[0003] Although some continuous annealing units are equipped with width measuring instruments at the inlet and outlet, the relevant measurement data has not been fully utilized for controlling the actual strip width. Therefore, it is urgent and important to develop a strip width necking control technology based on existing equipment and the characteristics of continuous annealing units. This technology can not only improve the unit's yield but also reduce the reversal rate of width discrepancies, thereby bringing significant economic benefits to the unit. Summary of the Invention
[0004] The purpose of this invention is to provide a method for adjusting the necking amount of strip steel during continuous annealing, which can accurately calculate and obtain the required necking amount of strip steel in the continuous annealing stage, accurately and effectively adjust the necking of strip steel, and control the strip steel width before trimming, thereby reducing additional costs caused by substandard strip steel width.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: A method for adjusting the necking amount of strip during continuous annealing includes the following steps: Step A: Construct a discrete model of the strip between a single pair of furnace rolls, dividing the strip laterally into... Each small element is unitized; Step B: Collect on-site production data of the continuous annealing unit and typical parameters of the furnace rollers in the current unit, including: stress applied in the furnace heating section. Stress applied in the soaking zone of the furnace Stress distribution at each stage inside the furnace Yield strength of strip steel in furnace Elastic modulus of strip steel in furnace strip width Original length of strip between furnace rolls Number of roller pairs in the furnace Minimum value of strip necking in furnace The maximum value of strip necking in the furnace Minimum stress in the furnace heating section Maximum stress in the furnace heating section Minimum stress in the soaking zone of the furnace Maximum stress in the soaking zone of the furnace ; Step C: Calculate the necking amount of the strip ; Step D: Determine the inequalities Is it true? If it is true, then determine... If the required necking amount of the strip steel in the continuous annealing section is not met, proceed to step O; otherwise, proceed to step E. Step E: Set the stress adjustment step size for the furnace heating section. Step size multiple ; Step F: Reduce the stress in the heating section of the furnace. ; Step G: Determine the inequalities Is it true? If it is true, then let... If step H is not met, proceed to step J. ; Step H: Calculate the necking amount of the strip ; Step 1: Determine the inequality Is it true? If it is true, then determine... If the required necking amount of the strip steel in the continuous annealing section is not met, proceed to step O; otherwise, proceed to step F. Step J: Set the stress adjustment step size of the soaking zone inside the furnace. Step size multiple ; Step K: Reduce the stress in the soaking zone of the furnace. ; Step L: Determine the inequality Is it true? If it is true, then let... If step M is not executed, it is determined that the strip necking adjustment has failed, and the process jumps to step O. ; Step M: Calculate the necking amount of the strip. ; Step N: Determine the inequality Is it true? If it is true, then determine... If the required necking amount of the strip steel in the continuous annealing section is not met, proceed to step O; otherwise, proceed to step K. Step O: Process ends; In steps C, H, and M, the strip necking amount The calculation formula is: , in, For strip steel in the first For the furnace rollers The longitudinal elongation produced by each element.
[0006] The beneficial effects of this invention are as follows: This invention constructs a lateral discrete model of the strip between a single pair of furnace rolls, collects on-site production data of the continuous annealing unit and typical parameters of the furnace rolls in the current unit, establishes a calculation model for the necking amount of the strip in the continuous annealing section, defines characteristic parameters in the necking amount calculation model, calculates the necking amount and plate shape of the heating section, and calculates the necking amount and plate shape of the soaking section; by performing micro-element calculations on a single pair of furnace rolls in the continuous annealing section, the required strip necking amount of the strip in the continuous annealing stage is obtained. After being put into production, this invention substantially improves the strip width accuracy, meets production requirements, increases production efficiency, and reduces rework caused by width discrepancies, thus avoiding additional costs. Attached Figure Description
[0007] Figure 1 This is a flowchart of a method for adjusting the necking amount of strip during continuous annealing according to the present invention.
[0008] Figure 2 This is a simplified diagram of the logarithmic distribution of furnace rollers during the continuous annealing stage in an embodiment of the present invention.
[0009] Figure 3 This is a discrete model of the strip steel between a single pair of furnace rolls in an embodiment of the present invention.
[0010] Figure 4 This is a stress distribution diagram of each stage in the furnace caused by the furnace temperature and the shape of the furnace rollers in an embodiment of the present invention. Detailed Implementation
[0011] The technical solutions in the embodiments of the present invention will now be described with reference to the accompanying drawings. Example 1
[0012] like Figure 1 As shown, the present invention provides a method for adjusting the necking amount of strip during continuous annealing, comprising the following steps: (1) In step A, a discrete model of the strip between a single pair of furnace rolls is constructed, and the strip is laterally divided into... Unitize each small element, such as Figure 2 and Figure 3 As shown; (2) In step B, collect on-site production data of the continuous annealing unit and typical parameters of the furnace rollers in the current unit, including: the stress applied in the heating section of the furnace. Stress applied in the soaking zone of the furnace Stress distribution at each stage inside the furnace like Figure 4As shown, the yield strength of strip steel in the furnace Elastic modulus of strip steel in furnace strip width Original length of strip between furnace rolls Number of roller pairs in the furnace Minimum value of strip necking in furnace The maximum value of strip necking in the furnace Minimum stress in the furnace heating section Maximum stress in the furnace heating section Minimum stress in the soaking zone of the furnace Maximum stress in the soaking zone of the furnace ; (3) In step C, calculate the necking amount of the strip. ,in, For strip steel in the first For the furnace rollers The longitudinal elongation produced by each element: , Calculated: ; (4) In step D, determine the inequality If this is not true, proceed to step E; (5) In step E, the stress adjustment step size of the furnace heating section is set. Step size multiple ; (6) In step F, the stress in the heating section of the furnace is reduced. ; (7) In step G, determine the inequality Is it true? If it is true, then let... If step H is not met, proceed to step J. ; (8) In step H, calculate the necking amount of the strip. ,in, For strip steel in the first For the furnace rollers The longitudinal elongation produced by each element: ; (9) In step I, determine the inequalities Is it true? If it is true, then determine... If the required necking amount of the strip steel in the continuous annealing section is not met, proceed to step O; otherwise, proceed to step F. Calculated: , , , ; (10) In step I, determine the inequalities Established, the required strip necking amount for the continuous annealing section is determined to be... Proceed to step O; (11) In step O, the process ends. Example 2
[0013] like Figure 1 As shown, the present invention provides a method for adjusting the necking amount of strip during continuous annealing, comprising the following steps: (1) In step A, a discrete model of the strip between a single pair of furnace rolls is constructed, and the strip is laterally divided into... Unitize each small element, such as Figure 2 and Figure 3 As shown; (2) In step B, collect on-site production data of the continuous annealing unit and typical parameters of the furnace rollers in the current unit, including: the stress applied in the heating section of the furnace. Stress applied in the soaking zone of the furnace Stress distribution at each stage inside the furnace like Figure 4 As shown, the yield strength of strip steel in the furnace Elastic modulus of strip steel in furnace strip width Original length of strip between furnace rolls Number of roller pairs in the furnace Minimum value of strip necking in furnace The maximum value of strip necking in the furnace Minimum stress in the furnace heating section Maximum stress in the furnace heating section Minimum stress in the soaking zone of the furnace Maximum stress in the soaking zone of the furnace ; (3) In step C, calculate the necking amount of the strip. ,in, For strip steel in the first For the furnace rollers The longitudinal elongation produced by each element: , Calculated: ; (4) In step D, determine the inequality If this is not true, proceed to step E; (5) In step E, the stress adjustment step size of the furnace heating section is set. Step size multiple ; (6) In step F, the stress in the heating section of the furnace is reduced. ; (7) In step G, determine the inequality Is it true? If it is true, then let... If step H is not met, proceed to step J. ; (8) In step H, calculate the necking amount of the strip. ,in, For strip steel in the first For the furnace rollers The longitudinal elongation produced by each element: ; (9) In step I, determine the inequalities Is it true? If it is true, then determine... If the required necking amount of the strip steel in the continuous annealing section is not met, proceed to step O; otherwise, proceed to step F. Calculated: , , , ; (10) In step G, determine the inequality If this is not true, proceed to step J; (11) In step J, the stress adjustment step size of the soaking zone in the furnace is set. Step size multiple ; (12) In step K, the stress in the soaking zone of the furnace is reduced. ; (13) In step L, determine the inequality Is it true? If it is true, then let... If step M is not executed, it is determined that the strip necking adjustment has failed, and the process jumps to step O. ; (14) In step M, calculate the strip necking amount. ,in, For strip steel in the first For the furnace rollers The longitudinal elongation produced by each element: ; (15) In step N, determine the inequality Is it true? If it is true, then determine... If the required necking amount of the strip steel in the continuous annealing section is not met, proceed to step O; otherwise, proceed to step K. Calculated: , , , ; (16) In step N, determine the inequality Established, the required strip necking amount for the continuous annealing section is determined to be... Proceed to step O; (17) In step O, the process ends.
[0014] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.
Claims
1. A method for adjusting the necking amount of strip during continuous annealing, characterized in that: Includes the following steps: Step A: Construct a discrete model of the strip between a single pair of furnace rolls, dividing the strip laterally into... Each small element is unitized; Step B: Collect on-site production data of the continuous annealing unit and typical parameters of the furnace rollers in the current unit, including: stress applied in the furnace heating section. Stress applied in the soaking zone of the furnace Stress distribution at each stage inside the furnace Yield strength of strip steel in furnace Elastic modulus of strip steel in furnace strip width Original length of strip between furnace rolls Number of roller pairs in the furnace Minimum value of strip necking in furnace The maximum value of strip necking in the furnace Minimum stress in the furnace heating section Maximum stress in the furnace heating section Minimum stress in the soaking zone of the furnace Maximum stress in the soaking zone of the furnace ; Step C: Calculate the necking amount of the strip ; Step D: Determine the inequalities Is it true? If it is true, then determine... If the required necking amount of the strip steel in the continuous annealing section is not met, proceed to step O; otherwise, proceed to step E. Step E: Set the stress adjustment step size for the furnace heating section. Step size multiple ; Step F: Reduce the stress in the heating section of the furnace. ; Step G: Determine the inequality Is it true? If it is true, then let... If step H is not met, proceed to step J. ; Step H: Calculate the necking amount of the strip ; Step 1: Determine the inequality Is it true? If it is true, then determine... If the required necking amount of the strip steel in the continuous annealing section is not met, proceed to step O; otherwise, proceed to step F. Step J: Set the stress adjustment step size of the soaking zone inside the furnace. Step size multiple ; Step K: Reduce the stress in the soaking zone of the furnace. ; Step L: Determine the inequality Is it true? If it is true, then let... If step M is not executed, it is determined that the strip necking adjustment has failed, and the process jumps to step O. ; Step M: Calculate the necking amount of the strip. ; Step N: Determine the inequality Is it true? If it is true, then determine... If the required necking amount of the strip steel in the continuous annealing section is not met, proceed to step O; otherwise, proceed to step K. Step O: Process ends; In steps C, H, and M, the strip necking amount The calculation formula is: ， in, For strip steel in the first For the furnace rollers The longitudinal elongation produced by each element.