Control method for dynamically adjusting opening degree of side guide system of continuous casting and rolling production line

Abstract

The invention relates to the technical field of continuous casting and rolling production line system control, and particularly discloses a control method for dynamically adjusting the opening degree of a side guide system of a continuous casting and rolling production line, which comprises the following steps: calculating the quality of a width adjusting section casting blank / strip steel: width adjustment comprises two forms of width adjustment from narrow to wide and width adjustment from wide to narrow; calculating and tracking the length of the continuous width-adjusting section: when the head tracking value of the strip steel of the continuous width-adjusting section reaches the position of a side guide system on a production line, activating the continuous width calculation of the strip steel and the length calculation of the head passing through the position, and when the tail tracking of the width-adjusting section passes through the position; continuously calculating the width of the width-adjusting section strip steel: calculating a changing curve of the width of the intermediate billet along with the rolling speed according to the thickness, the speed and the length of the strip steel at the side guide system to be calculated, and calculating the actual bandwidth; setting and calculating the opening degree of the side guide system; according to the method, the automation level of a production line is improved, the asymmetric clamping risk of the strip steel is eliminated, and the production stability in the online width adjusting process is improved.

Description

Technical Field

[0001] This invention relates to the field of continuous casting and rolling production line system control technology, specifically to a control method for dynamically adjusting the opening degree of the side guide system in a continuous casting and rolling production line. Background Technology

[0002] In the headless production mode of continuous casting and rolling lines, the continuous casting crystallizer has the function of online continuous width adjustment, which can flexibly adjust the die width online to meet diverse order requirements. However, the side guide system in the rolling mill area still adopts the traditional static width setting mode—that is, the width of the head of a single strip is used as a fixed reference value for parameter locking. This static setting method causes a serious process mismatch with the dynamic width adjustment characteristics of the upstream continuous casting process. When the width of the billet changes continuously, the side guide system lacks a real-time width tracking compensation mechanism, which leads to asymmetrical clamping of the strip during the rolling process. This not only causes uneven distribution of strip clamping force (local overtightness or slackness), but also causes quality defects such as strip deviation and edge damage, which seriously restricts the realization of the advantages of the headless rolling process.

[0003] Under the dynamic width adjustment process in continuous casting, the control logic of the current mill side guide system has significant defects: the secondary system (L2) sets the opening degree based on the average four-meter width of the strip head collected by the width measuring instrument at the roughing mill exit (only one hot reference value is issued for each strip), superimposed with a fixed empirical compensation value. This static control mode fundamentally conflicts with the continuous change in strip width generated by online width adjustment in continuous casting, resulting in a dynamic deviation between the actual width and the set value. When the deviation exceeds the threshold, the system is forced to switch to manual intervention mode, relying on the operator's experience for manual adjustment, causing problems such as fluctuations in clamping accuracy, interruption of production continuity, and uncontrollable quality risks. Therefore, this paper explores a control method for dynamically adjusting the opening degree of the side guide system in the continuous casting and rolling production line to solve the problems of scrap steel and centerline deviation caused by untimely or inaccurate manual intervention in the existing side guide system's opening degree adjustment. Summary of the Invention

[0004] To address the problems existing in the prior art, the purpose of this invention is to provide a control method for dynamically adjusting the opening degree of the side guide system in a continuous casting and rolling production line. This method serves as an automatic control setting for the opening degree of the side guide system in the rolling mill area, ensuring stable opening degree control while avoiding manual intervention by operators.

[0005] The technical solution adopted by this invention to solve its technical problem is: a control method for dynamically adjusting the opening degree of the side guide system of a continuous casting and rolling production line, comprising the following steps:

[0006] S1. Calculation of the mass of the billet / strip in the width adjustment section: Width adjustment includes two forms: from narrow to wide and from wide to narrow. Based on the principle that the mass of the billet in the width adjustment section is equal to the mass of the strip after the mill rolls it down, the mass of the width adjustment section of the continuous casting billet is first calculated.

[0007] S2, Calculation and tracking of continuous width adjustment section length: When the head tracking value of the continuous width adjustment section strip reaches the position of the side guide system on the production line, the continuous width calculation of the strip and the head length calculation that has passed this position are activated. When the tail tracking of the width adjustment section passes this position, the width setting is kept at the last calculated value until the width L2 system setting value of the next non-width strip is issued.

[0008] S3. Continuous calculation of strip width in the width adjustment section: Calculate the change curve of intermediate billet width with rolling speed based on the strip thickness, speed and length at the side guide system to be calculated, and calculate the actual strip width.

[0009] S4. Calculation of the opening degree setting of the side guide system.

[0010] Specifically, in step S1, during the width adjustment mode from narrow to wide, the quality of the width-adjusting section of the cast billet is as follows:

[0011] .

[0012] Specifically, in the width adjustment mode from wide to narrow in step S1, the quality of the width adjustment section of the cast billet is as follows:

[0013] .

[0014] Specifically, m: the quality of the width adjustment segment; W S : Starting width, automatically collected by the L1 system; W e Target width, value sent by the L2 system; L c : Length of the continuous casting width adjustment section, value issued by the L2 system; t c : Crystallizer outlet thickness, automatically collected by the L1 system; ρ: Steel density.

[0015] Specifically, in step S2, the head and tail positions of the strip in the continuous width adjustment section are tracked. When the crystallizer width adjustment start K1=1, head tracking is automatically started:

[0016] ;

[0017] When the crystallizer width adjustment ends and K2=1, tail tracking will automatically start:

[0018] ;

[0019] In the formula: V m : The billet speed at the crystallizer outlet, automatically collected by the L1 system; V m+1 The billet velocity at the thickness change point is automatically collected by the L1 system; V m+x : Strip speed at the exit of the side guide system, automatically collected by the L1 system; T rh: Head position, the length from the starting point to the current position; T rt : Tail position, the length from the starting point to the current position.

[0020] Specifically, the length of the adjustable-width strip has been calculated at the side guide system, and when the head T of the continuous adjustable-width strip... rh After the tracking value reaches the position of the side guide system, the length L of the strip steel that has passed the side guide system in the width adjustment section is started. r track:

[0021] .

[0022] Specifically, the actual strip width W is calculated under the width adjustment mode from narrow to wide. x1 :

[0023] ;

[0024] ;

[0025] ;

[0026] Calculating the actual strip width W under the width adjustment mode from wide to narrow x2 :

[0027] ;

[0028] ;

[0029] ;

[0030] In the formula: L m : Length of the width-adjustable strip at the side guide system, calculated based on the mass of the width-adjustable strip; α: included angle; L0: width change on one side; L r The length of the strip head that has passed the side guide system in the width adjustment section; t r : Strip thickness at the side guide system, automatically collected by the L1 system; V r : Strip speed at the side guide system, automatically collected by the L1 system.

[0031] Specifically, the calculation of the opening angle setting of the side guide system is as follows:

[0032] Side guide system aperture setting R in width adjustment mode from narrow to wide ef1 :

[0033] ;

[0034] Side guide system aperture setting R in width adjustment mode from wide to narrow ef2 :

[0035]

[0036] In the formula: K w : The width spread coefficient of the strip at the side guide system.

[0037] The present invention has the following beneficial effects:

[0038] The present invention provides a control method for dynamically adjusting the opening degree of the side guide system in a continuous casting and rolling production line. During the continuous strip width adjustment stage, the opening degree control of the side guide system is stable, highly accurate, and has a fast response, which improves the automation level of the production line. It effectively avoids scrap steel and centerline deviation caused by the mismatch between the opening degree of the side guide system and the change in strip width, as well as poor accuracy of manual intervention. It also eliminates the risk of asymmetrical strip clamping and improves the production stability during the online width adjustment process. Attached Figure Description

[0039] Figure 1 This is a schematic diagram showing the adjustment of the casting billet from narrow to wide.

[0040] Figure 2 This is a schematic diagram showing the adjustment of the casting billet from wide to narrow.

[0041] Figure 3 This is a schematic diagram for calculating the mass of a cast billet when its width is adjusted from narrow to wide.

[0042] Figure 4 This is a schematic diagram for calculating the mass of a cast billet when its width is adjusted to a narrow width.

[0043] Figure 5 This is a schematic diagram illustrating the calculation of the strip width when adjusting it from narrow to wide.

[0044] Figure 6 This is a schematic diagram illustrating the calculation of strip width adjustment from wide to narrow. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0046] In a continuous casting and rolling strip steel production line, a calculation method is designed to measure the continuous change in the hot strip width during the online width adjustment process of the crystallizer. This method serves as the automatic control setting for the opening degree of the side guide system in the rolling mill area. While ensuring stable opening degree control, it avoids manual intervention by operators, improves the automation level of the production line, and reduces or eliminates problems such as scrap steel and centerline deviation caused by untimely or inaccurate manual intervention. The specific invention content is as follows:

[0047] 1. Calculation of the mass of the billet / strip in the width adjustment section:

[0048] (1) Two forms of widening.

[0049] ① Adjust from narrow to wide, such as Figure 1 As shown.

[0050] ②From wide to narrow, such as Figure 2 As shown.

[0051] (2) Based on the principle that the quality of the billet in the width adjustment section is equal to the quality of the strip steel in the width adjustment section after rolling, the quality of the width adjustment section of the continuously cast billet is first calculated.

[0052] m: Quality of the width adjustment section.

[0053] W S : Starting width (automatically collected by L1 system).

[0054] W e Target width (value issued by L2 system).

[0055] L c : Length of the width adjustment section in continuous casting (value issued by L2 system).

[0056] t c : Crystallizer outlet thickness (automatically collected by L1 system).

[0057] ρ: Density of steel.

[0058] ① Calculation of mass from narrow to wide, such as Figure 3 As shown.

[0059] .

[0060] ② Calculation of mass from wide to narrow, such as Figure 4 As shown.

[0061] .

[0062] 2. Calculation and tracking of the length of continuous width adjustment sections:

[0063] (1) When the head tracking value of the continuous width adjustment section reaches the position of the side guide system on the production line, the continuous width calculation of the strip and the head length calculation that has passed this position are activated. When the tail tracking of the width adjustment section passes this position, the width setting is kept at the last calculated value until the width L2 system setting value of the next non-width adjustment strip is issued.

[0064] (2) Tracking the head and tail positions of the strip in the continuous width adjustment section.

[0065] K1: Crystallizer width adjustment start (automatic data acquisition by L1 system).

[0066] K2: Crystallizer width adjustment complete (automatic data acquisition by L1 system).

[0067] V m : Cast billet speed at the crystallizer outlet (automatically collected by the L1 system).

[0068] V m+1 : Casting speed at the thickness change point (automatically collected by L1 system). ...

[0070] V m+x : Slab / strip speed at thickness variation points (automatically collected by L1 system).

[0071] T rh Head position (length from the starting point to the current position).

[0072] T rt Tail position (length from the starting point to the current position).

[0073] When K1=1, head tracking is automatically started:

[0074] ;

[0075] When K2=1, tail tracking is automatically started:

[0076] .

[0077] (3) Calculation of the length of the strip steel that has passed the side guide system in the width adjustment section.

[0078] L r The length of the strip steel that has passed the side guide system in the width adjustment section.

[0079] Once the Trh tracking value at the head of the continuously width-adjusting section reaches the position of the side guide system, the length tracking of the strip that has passed through the side guide system in the width-adjusting section is initiated:

[0080] .

[0081] 3. Continuous calculation of strip width in the width adjustment section:

[0082] The curve of the intermediate billet width as a function of rolling speed is calculated based on the strip thickness, speed, and length at the side guide system to be calculated.

[0083] m: Mass of the width adjustment section (calculated from step 1).

[0084] W S : Starting width (automatically collected by L1 system).

[0085] W e Target width (value issued by L2 system).

[0086] L m : The length of the strip in the width adjustment section at the side guide system (calculated based on the mass of the strip in the width adjustment section).

[0087] α: Angle (calculated value).

[0088] L0: Change in width on one side (calculated value).

[0089] L r The length of the strip head that has passed the side guide system in the width adjustment section (calculated by head tracking).

[0090] t r : Strip thickness at the side guide system (automatically collected by L1 system).

[0091] V r : Strip speed at the side guide system (automatically acquired by L1 system).

[0092] W x1 At the side guide system, the width is adjusted from narrow to wide, which is the actual strip width.

[0093] W x2 At the side guide system, the width is adjusted from wide to narrow, which is the actual strip width.

[0094] (1) Calculate the length L of the strip at the side guide system based on the mass of the strip in the width adjustment section. m :

[0095] .

[0096] (2) Calculate the length L of the strip that has passed the side guide system in the width adjustment section based on the strip speed at the strip tracking and side guide system. r :

[0097] .

[0098] (3) Adjust from narrow to wide, and calculate the actual strip width W. x1 .

[0099] like Figure 5 As shown, we can obtain

[0100] ;

[0101] ;

[0102] .

[0103] (4) Adjust from wide to narrow, and calculate the actual strip width W. x2 .

[0104] like Figure 6As shown, we can obtain

[0105] ;

[0106] ;

[0107] .

[0108] 4. Calculation of the opening degree setting for the side guide system.

[0109] K w : The strip width spread factor (practical value) at the side guide system.

[0110] R ef1 : Adjust from narrow to wide, the opening setting value of the side guide system.

[0111] R ef2 : The opening setting value of the side guide system, from wide to narrow.

[0112] (1) Adjusting from narrow to wide, setting the side guide system aperture R ef1 :

[0113] .

[0114] (2) Adjusting from wide to narrow, setting the side guide system aperture R ef2 :

[0115] .

[0116] This invention develops a dynamic strip width calculation method based on the real-time change of the opening degree of the continuous casting crystallizer, constructs a synchronous linkage mechanism between the rolling mill side guide system and the continuous casting process, realizes millimeter-level dynamic matching of the width setting value of the entire production line, eliminates the risk of asymmetric strip clamping, and ensures the stable operation of the headless rolling process.

[0117] 1. When the width of the billet changes continuously online, the mill side guide system accurately calculates, dynamically follows and compensates for the opening degree to avoid production and quality accidents such as centerline deviation and strip edge scraping.

[0118] 2. The mill side guide system automatically adjusts the opening degree, improving the automation level of the production line and avoiding problems such as response lag and low precision caused by manually adjusting the opening degree of the side guide system.

[0119] 3. Track the head and tail positions and dynamic width of the billet during the continuous online width change process, and realize the visualization of the width adjustment amount and position throughout the continuous casting and rolling production line.

[0120] 4. Calculation method for the opening degree of the side guide system in the rolling mill area after the failure of the online width detection instrument.

[0121] This invention is not limited to the above-described embodiments. Anyone should know that any structural changes made under the guidance of this invention, and any technical solutions that are the same as or similar to this invention, fall within the protection scope of this invention.

[0122] The technologies, shapes, and structures not described in detail in this invention are all known technologies.

Claims

1. A method for dynamically adjusting the opening degree of a side guide system in a continuous casting and rolling production line, characterized in that, Includes the following steps: S1. Calculation of the mass of the billet / strip in the width adjustment section: Width adjustment includes two forms: from narrow to wide and from wide to narrow. Based on the principle that the mass of the billet in the width adjustment section is equal to the mass of the strip after the mill rolls it down, the mass of the width adjustment section of the continuous casting billet is first calculated. S2, Calculation and tracking of continuous width adjustment section length: When the head tracking value of the continuous width adjustment section strip reaches the position of the side guide system on the production line, the continuous width calculation of the strip and the head length calculation that has passed this position are activated. When the tail tracking of the width adjustment section passes this position, the width setting is kept at the last calculated value until the width L2 system setting value of the next non-width strip is issued. S3. Continuous calculation of strip width in the width adjustment section: Calculate the change curve of intermediate billet width with rolling speed based on the strip thickness, speed and length at the side guide system to be calculated, and calculate the actual strip width. S4. Calculation of the opening degree setting of the side guide system.

2. The control method for dynamically adjusting the opening degree of the side guide system in the continuous casting and rolling production line according to claim 1, characterized in that, In the width adjustment mode from narrow to wide in step S1, the quality of the width adjustment section of the billet is as follows: 。 3. The control method for dynamically adjusting the opening degree of the side guide system in the continuous casting and rolling production line according to claim 1, characterized in that, In step S1, under the width adjustment mode from wide to narrow, the quality of the width-adjusting section of the cast billet is as follows: 。 4. The control method for dynamically adjusting the opening degree of the side guide system of the continuous casting and rolling production line according to claim 2 or 3, characterized in that, m: Mass of the width adjustment section; W S : Starting width, automatically collected by the L1 system; W e Target width, value sent by the L2 system; L c : Length of the continuous casting width adjustment section, value issued by the L2 system; t c Crystallizer outlet thickness, automatically collected by the L1 system; ρ: Density of steel.

5. The control method for dynamically adjusting the opening degree of the side guide system of the continuous casting and rolling production line according to claim 1, characterized in that, In step S2, the head and tail positions of the strip in the continuous width adjustment section are tracked. When the crystallizer width adjustment start K1=1, head tracking is automatically started. ； When the crystallizer width adjustment ends and K2=1, tail tracking will automatically start: ； In the formula: V m : The billet speed at the crystallizer outlet, automatically collected by the L1 system; V m+1 The billet velocity at the thickness change point is automatically collected by the L1 system; V m+x : Strip speed at the exit of the side guide system, automatically collected by the L1 system; T rh : Head position, the length from the starting point to the current position; T rt : Tail position, the length from the starting point to the current position.

6. The control method for dynamically adjusting the opening degree of the side guide system of the continuous casting and rolling production line according to claim 5, characterized in that, The length of the strip in the width adjustment section has been calculated at the side guide system, and the head T of the continuous width adjustment section strip... rh After the tracking value reaches the position of the side guide system, the length L of the strip steel that has passed the side guide system in the width adjustment section is started. r track: 。 7. The control method for dynamically adjusting the opening degree of the side guide system of the continuous casting and rolling production line according to claim 1, characterized in that, The actual strip width W is calculated under the width adjustment mode from narrow to wide. x1 : ； ； ； Calculating the actual strip width W under the width adjustment mode from wide to narrow x2 : ； ； ； In the formula: L m : Length of the width-adjustable strip at the side guide system, calculated based on the mass of the width-adjustable strip; α: included angle; L0: width change on one side; L r The length of the strip head that has passed the side guide system in the width adjustment section; t r : Strip thickness at the side guide system, automatically collected by the L1 system; V r : Strip speed at the side guide system, automatically collected by the L1 system.

8. The control method for dynamically adjusting the opening degree of the side guide system of the continuous casting and rolling production line according to claim 7, characterized in that, The calculation of the opening degree setting of the side guide system: Side guide system aperture setting R in width adjustment mode from narrow to wide ef1 : ； Side guide system aperture setting R in width adjustment mode from wide to narrow ef2 : In the formula: K w : The width spread coefficient of the strip at the side guide system.

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