Method for matching continuous rolling speeds of roughing mill and finishing mill

Abstract

The invention provides a method for matching the continuous rolling speed of a roughing mill and a finishing mill, which comprises the following steps: S1, acquiring the running speed information of a first finishing mill in real time, the running speed information comprising a roller linear speed obtained by a speed measurement encoder mounted on a motor of an F1 mill; the speed of the rolled piece at the inlet of the rolling mill is obtained through a speed measuring encoder arranged on an outlet pinch roll of the finish rolling descaling box; s2, target values of outlet speeds of rolled pieces of the roughing mill in different rolling stages are calculated and set, and stepped speed control reference values of roller ways in all areas between an outlet of the roughing mill and an inlet of a finishing mill are calculated and set; and S3, according to the target value of the speed and the stepped speed control reference value set in the step S2, a roughing mill, a finishing mill and all sections of roller ways are controlled in a linkage mode. On the premise that the hot rolling production and use precision is guaranteed, it is guaranteed that the roughing mill and the finish rolling first mill work synchronously at the same speed, the roughing and finish rolling continuous rolling function is achieved, and the rolling rhythm is improved.

Description

Technical Field

[0001] This invention relates to the field of iron and steel metallurgy technology, and more particularly to a method for matching the continuous rolling speeds of a roughing mill and a finishing mill. Background Technology

[0002] Steel rolling is a core process in metal plastic processing, referring to the application of pressure to a metal billet using rotating rolls to induce continuous plastic deformation, thereby obtaining steel with a predetermined cross-sectional shape and size. In hot-rolled strip steel production, this process is mainly divided into two key stages: roughing and finishing. Roughing aims to rapidly roll a continuous slab into a strip of intermediate thickness, completing most of the thickness reduction; finishing is responsible for precision rolling of the strip to obtain accurate final thickness, excellent shape, and surface quality. Achieving a stable and efficient connection between roughing and finishing, i.e., continuous roughing and finishing rolling, is an important development direction for improving production line pace, reducing energy consumption, and enhancing product consistency.

[0003] In current industrial production, especially in short-process production lines equipped with hot-rolling boxes like Ansteel's 1700ASP, roughing and finishing rolling are typically organized using a semi-continuous rolling process. In this process, after the roughing mill completes the rolling of an intermediate billet, it is sent to the hot-rolling box for coiling, temporary storage, and uncoiling. Only then is the intermediate billet sent to the finishing mill. The roughing and finishing zones are relatively independent in terms of equipment and control; there is no real-time, closed-loop speed linkage control between them. In existing technologies, to achieve true continuous roughing and finishing rolling, the main approach is to conduct large-scale hardware upgrades and modifications to the roughing zone, such as adding roughing mill stands, strengthening the transmission system, and updating the control system, so that the roughing mill itself has continuous rolling capabilities, thereby matching the continuous rolling requirements of the finishing mill in terms of production capacity.

[0004] However, the aforementioned existing technical solutions have significant drawbacks. First, large-scale hardware upgrades require substantial investment and lead to increased subsequent maintenance costs. More importantly, even after the upgrades are completed, achieving precise and dynamic speed matching at the junction of roughing and finishing rolling remains extremely difficult due to the fundamental differences in their process characteristics. Insufficient speed synchronization precision directly results in steel piling or pulling accidents between the roughing and finishing mill exits, severely restricting production stability and yield, making it difficult to achieve stable continuous rolling for many high-end products with stringent rolling stability requirements. Therefore, how to precisely control the speed difference between the roughing and finishing mill exits within the existing production line hardware framework through optimized control strategies and methods has become a core technical bottleneck that urgently needs to be overcome to achieve efficient and reliable continuous roughing and finishing rolling. Summary of the Invention

[0005] In view of this, the purpose of this invention is to propose a method for matching the speeds of roughing and finishing mills in continuous rolling, so as to solve the technical problem of speed mismatch in existing roughing and finishing continuous rolling technology.

[0006] The technical means employed in this invention are as follows:

[0007] A method for improving the speed matching between roughing mills and finishing mills includes the following steps: S1. Real-time acquisition of the running speed information of the first stand of the finishing mill, the running speed information including the roll linear speed obtained by the speed encoder installed on the F1 mill motor, and the mill entry workpiece speed obtained by the speed encoder installed on the pinch roll at the exit of the finishing mill descaling box; S2. Based on the operating speed information obtained in S1, calculate and set the target value of the roughing mill workpiece exit speed under different rolling stages, as well as the step speed control reference value of the roller table in each area from the roughing mill exit to the finishing mill inlet. S3. Based on the target speed value and the stepped speed control reference value set in S2, the roughing mill, finishing mill, and each section of the roller table are controlled in a coordinated manner. Specifically, the speed of the roughing mill motor is controlled to match the target speed of the roughing mill workpiece exit, the finishing mill is controlled to operate in the speed-up rolling mode, and each section of the roller table is controlled to operate according to the stepped speed control reference value, so that the exit speed of the roughing mill and the entry bite speed of the first stand of the finishing mill are kept synchronously matched.

[0008] Furthermore, in S2, the different rolling stages include the first stage from the completion of the flying shear head to the biting of the first finishing mill stand, and the second stage after the biting of the first finishing mill stand; In the first stage, the target value v of the workpiece exit speed of the roughing mill is set. f Satisfy: v f = v r1 Δm1, where v r1 Δm1 is the linear velocity of the rolls before the first stand of the finishing mill bites the steel, and Δm1 is the first speed adjustment parameter. In the second stage, the target value v of the workpiece exit speed of the roughing mill is set. f Satisfy: v f =v r2 Δm2, where v r2 Δm2 is the speed of the rolled piece after the first stand of the finishing mill bites the steel, based on the feedback from the speed measuring roller at the exit of the descaling box; Δm2 is the second speed adjustment parameter. Among them, Δm1 and Δm2 both include the friction coefficient correction value, the correction value K and the steel plate micro-tension control value, where K is 0.01~0.06.

[0009] Furthermore, in S2, the stepped speed control reference value for each section of the roller conveyor is based on v r2 And set the corresponding speed control parameter α; Each section of the roller conveyor includes: the first section of the roller conveyor, the second section of the roller conveyor, the third section of the roller conveyor, the roller conveyor in the hot rolling box area, and the roller conveyor in the flying shear and finishing mill descaling box area; The speed control reference value for the first section of the roller conveyor is v. D1 =v r2 α1; The speed control reference value for the second section of the roller conveyor is v. D2 =v r2 α2; The speed control reference value for the third section of the roller conveyor is v. D3 =v r2 α3; The reference value for the speed control of the roller conveyor in the hot roll box area is v D4 =vr2 α4; The reference value for speed control of the flying shear and finishing mill descaling box roller conveyor is v D5 =v r2 α5; Among them, α1~α5 are the speed control parameters of each section of the roller table from the exit of the roughing mill to the front of the finishing mill.

[0010] Furthermore, the tension control between the roughing mill exit speed and the finishing mill first stand entry bite speed is specifically as follows: v D1 ≧v f v D5 ≦v r2 .

[0011] Furthermore, the control calculation formula for the target value n of the roughing mill motor speed is as follows: v r =v f H / (1.25H-0.25h) (1+R)% n=v r 60 / π D Where: n is the speed of the roughing mill motor, v r v is the linear velocity of the roughing mill rolls. f Here, H is the target value for the exit speed of the roughing mill, h is the thickness of the billet at the entry point of the roughing mill, r is the correction parameter for the exit speed of the roughing mill, and D is the diameter of the roughing mill rolls.

[0012] Furthermore, in S3, the speed-up rolling control process of the finishing mill includes: finishing mill start-up control, strip threading speed setting, and speed-up rolling after all stands have completed strip threading.

[0013] Furthermore, the speed of the roller conveyors in the flying shear and finishing mill descaling box areas is based on the stepped speed control reference value v. D5 To take control.

[0014] Furthermore, after the flying shear head is completed, the linear speed v of the first stand of the finishing mill is determined. r1 The change in the rolling mill speed (v) is adjusted in real time to control the exit speed of the workpiece in the first stage. f v f This refers to adjusting the speed n of the roughing mill motor.

[0015] Furthermore, when the length of the intermediate billet is greater than the distance between the first finishing mill and the last roughing mill, a method of matching the continuous rolling speeds of the roughing mill and the finishing mill is adopted.

[0016] Compared with the prior art, the present invention has the following advantages: This invention, while ensuring the accuracy of hot rolling production, ensures that the roughing mill and finishing F1 mill operate at synchronized speeds during the rolling of all varieties, especially in the production of silicon steel. This enables continuous roughing and finishing rolling, improves the rolling rhythm, ensures accurate speed difference between the roughing mill and finishing F1 mill, reduces the occurrence of strip breakage or tearing accidents during the rolling process, and lowers enterprise costs. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a flowchart of the method of the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0020] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0021] like Figure 1 As shown, this invention provides a method for matching the continuous rolling speeds of a roughing mill and a finishing mill. During production, the rolling speed of the finishing F1 mill is tracked and analyzed. Through data calculation, the speed difference between the roughing mill and the finishing F1 mill during continuous rolling is obtained. This method allows for the resetting of the roughing mill's rolling speed, ensuring that the exit speed of the roughing mill is consistent with the inlet bite speed of the finishing F1 mill. This includes adjusting and controlling the different speed regulation capabilities and response times of the roughing mill and the finishing F1 mill, achieving synchronous operation of the roughing mill and the finishing F1 mill in a short-process hot rolling line. This enables continuous roughing and finishing rolling of all strip steel specifications, improving production efficiency, expanding rolling varieties, and reducing enterprise costs. Specifically, the method includes the following steps: S1. Real-time acquisition of the running speed information of the first stand of the finishing mill, the running speed information including the roll linear speed obtained by the speed encoder installed on the F1 mill motor, and the mill entry workpiece speed obtained by the speed encoder installed on the pinch roll at the exit of the finishing mill descaling box; S2. Based on the operating speed information obtained in S1, calculate and set the target value of the roughing mill workpiece exit speed under different rolling stages, as well as the step speed control reference value of the roller table in each area from the roughing mill exit to the finishing mill inlet. The different rolling stages include the first stage from the completion of the flying shear head to the biting of the first stand of the finishing mill, and the second stage after the biting of the first stand of the finishing mill; In the first stage, the target value v of the workpiece exit speed of the roughing mill is set. f Satisfy: v f = v r1 Δm1, where v r1 Δm1 is the linear velocity of the rolls before the first stand of the finishing mill bites the steel, and Δm1 is the first speed adjustment parameter. In the second stage, the target value v of the workpiece exit speed of the roughing mill is set. f Satisfy: v f=v r2 Δm2, where v r2 Δm2 is the speed of the rolled piece after the first stand of the finishing mill bites the steel, based on the feedback from the speed measuring roller at the exit of the descaling box; Δm2 is the second speed adjustment parameter. Among them, Δm1 and Δm2 both include the friction coefficient correction value, the correction value K (K=0.01~0.06) and the steel plate micro-tension control value.

[0022] The stepped speed control reference value for each section of the roller conveyor is based on v. r2 And set the corresponding speed control parameter α; Each section of the roller conveyor includes: the first section of the roller conveyor, the second section of the roller conveyor, the third section of the roller conveyor, the roller conveyor in the hot rolling box area, and the roller conveyor in the flying shear and finishing mill descaling box area; The speed control reference value for the first section of the roller conveyor is v. D1 =v r2 α 1； The speed control reference value for the second section of the roller conveyor is v. D2 =v r2 α 2； The speed control reference value for the third section of the roller conveyor is v. D3 =v r2 α 3； The reference value for the speed control of the roller conveyor in the hot roll box area is v D4 =vr2 α 4； The reference value for speed control of the flying shear and finishing mill descaling box roller conveyor is v D5 =v r2 α 5； Among them, α1~α5 are the speed control parameters of each section of the roller table from the exit of the roughing mill to the front of the finishing mill.

[0023] The specific tension control for maintaining the roughing mill exit speed and the finishing mill inlet bite speed is as follows: v D1 ≧v f v D5 ≦v r2 .

[0024] S3. Based on the target speed value and the stepped speed control reference value set in S2, the roughing mill, finishing mill, and each section of the roller table are controlled in a coordinated manner. Specifically, the speed of the roughing mill motor is controlled to match the target speed of the roughing mill workpiece exit, the finishing mill is controlled to operate in the speed-up rolling mode, and each section of the roller table is controlled to operate according to the stepped speed control reference value, so that the exit speed of the roughing mill and the entry bite speed of the first stand of the finishing mill are kept synchronized.

[0025] The control calculation formula for the target value n of the roughing mill motor speed is as follows: v r =v f H / (1.25H-0.25h) (1+R)% n=v r 60 / π D Where: n is the speed of the roughing mill motor, v r v is the linear velocity of the roughing mill rolls. f Here, H is the target value for the exit speed of the roughing mill, h is the thickness of the billet at the entry point of the roughing mill, r is the correction parameter for the exit speed of the roughing mill, and D is the diameter of the roughing mill rolls.

[0026] The core technology of this invention is to keep the bite speed of the strip entering the finishing F1 mill synchronized with the rolling speed of the roughing mill, preventing strip slippage or breakage accidents caused by speed inconsistency. The bite speed of the finishing F1 mill is 0.5~1.0 m / s, while the rolling speed of the roughing mill is 4 m / s. Synchronous speed control is achieved using the following method: 1. The finishing mill speed is measured by a speed encoder mounted on the motor to determine the motor's rotational speed, and the linear velocity of the mill rolls is calculated. The speed of the workpiece entering the mill is measured by a speed encoder mounted on the pinch rolls at the exit of the finishing mill descaling box.

[0027] 2. The R2 belt speed adjustment of the roughing mill is achieved by using a combination of empirical and normal formulas to obtain the speed conversion values ​​during the roughing and finishing mill rolling processes, and then adjusting the speed accordingly.

[0028] 3. To ensure product quality, the finishing mill must adopt an accelerated rolling method, therefore the finishing mill rolling control method needs to be modified. This includes the roughing mill rolling speed control method, and the stepped speed control method for the roughing mill exit roller table, hot coil box area roller table, flying shear and descaling box area roller table.

[0029] 4. To achieve accurate speed difference control, the following control parameters were adjusted or optimized: stepped speed control parameters for each zone's roller conveyor, speed-up rolling control parameters for the finishing mill, and rolling speed control parameters for the roughing mill.

[0030] Based on the formula verification, by combining empirical formulas with normal formulas, the conversion between the speed of the roughing mill under load and the speed of the finishing mill during rolling is obtained.

[0031] After the flying shear completes the head cutting, the exit speed v of the roughing mill is... f = v r1 Δm1.

[0032] After the finishing mill bites the steel, the exit speed v of the roughing mill... f =v r2 Δm2.

[0033] After the finishing mill bites the steel, the speed of the roller table between the roughing mill and the finishing mill is controlled by a stepped speed control.

[0034] The speed control reference value for the first section of the roller conveyor is v. D1 =v r2 α1; The speed control reference value for the second section of the roller conveyor is v. D2 =v r2 α2; The speed control reference value for the third section of the roller conveyor is v. D3 =v r2 α3; The reference value for the speed control of the roller conveyor in the hot roll box area is v D4 =vr2 α4; The reference value for speed control of the flying shear and finishing mill descaling box roller conveyor is v D5 =v r2 α5; The parameters in the above formula are defined as follows: v r1 : is the linear velocity of the rolls (m / s) before the first finishing mill bites the steel. v r2 : The steel plate speed (m / s) fed back by the speed measuring roller of the descaling box after the first finishing mill bites the steel. α1~α5: Speed ​​control parameters for each section of the roller conveyor from the roughing mill exit to the finishing mill, which are empirical coefficients.

[0035] Δm1: The parameter for adjusting the exit speed of the roughing mill after the flying shear completes the head cutting; Δm1 = Friction coefficient correction value + Correction value K + Steel plate micro-tension control value.

[0036] Δm2: The parameter for adjusting the exit speed of the roughing mill after the finishing mill bites the steel. Δm2 = Friction coefficient correction value + correction value K + steel plate micro-tension control value.

[0037] K = 0.01~0.06 Special attention should be paid to maintaining synchronization between the roughing mill's rolling speed and the finishing F1 mill's bite speed, while also maintaining tension control: v D1 ≧v f v D5 ≦v r2 The control calculation formula for the target value n of the roughing mill motor speed is as follows: v r =v f H / (1.25H-0.25h) (1+R)% n=v r 60 / π D Where: n is the speed of the roughing mill motor (r / min); v r v is the linear velocity of the roughing mill rolls (m / s); f denoted as: H = target value of roughing mill exit speed (m / s); H = thickness of billet at roughing mill inlet (mm); h = thickness of billet at roughing mill outlet (mm); R = roughing mill exit speed correction parameter; D = diameter of roughing mill roll (m). Finishing mill speed control mode: Implemented by a two-stage process controller. This ensures that the temperature during steel plate rolling remains within acceptable limits, thereby guaranteeing product quality and rolling stability.

[0038] A: Finishing mill start-up control; B: Threading speed setting; C: After all 6 finishing mills have completed threading, the rolling speed is increased.

[0039] Optimize the speed control of the roller conveyor in the finishing mill inlet area: A: The hot coil box operates in a straight-through mode; B: The speeds of each roller in the hot coil box and finishing mill descaling box areas are controlled in a stepped manner; C: After the flying shear completes the head cutting, the exit speed v of the roughing mill is... f = v r1 Δm1 is used to ensure that the first finishing mill can properly bite the steel, and that the steel plate will not accumulate, lift, or pull between the roughing and finishing mills, thus maintaining rolling stability. D: After the finishing mill bites the steel, the exit speed v of the workpiece from the roughing mill. f =v r2 Δm2 is used to ensure that the rolling speed of the roughing mill is synchronized with the rolling speed of the finishing mill F1, while maintaining tension control. This prevents steel plate from piling up, slipping, or pulling between the roughing and finishing mills, thus maintaining rolling stability.

[0040] Based on the aforementioned calculation formula, the reference speed of the roughing mill motor is calculated to control the rolling process of the roughing mill.

[0041] The speed control parameters α1~α5 of each section of the roller conveyor from the roughing mill exit to the finishing mill were adjusted and optimized.

[0042] The speed of the finishing mill descaling box rollers and the rollers after the flying shear are controlled in a stepped manner to ensure tension control of the steel plate.

[0043] After the flying shear completes the head cutting, the hot coil box and R2 roughing mill need to adjust the speed changes and step control parameters of the roller table in both areas in real time according to the changes in the linear speed of the finishing mill rolls.

[0044] After measuring and tracking the above data, optimizing and adjusting various parameters in a timely manner, and after data calculation and analysis, the rolling speed of the roughing mill and the bite speed of the finishing F1 mill are kept synchronized. This not only improves rolling efficiency but also reduces the occurrence of strip breakage or tearing accidents during the rolling process, thus meeting the requirements of on-site production.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for matching the continuous rolling speeds of a roughing mill and a finishing mill, characterized in that, Includes the following steps: S1. Real-time acquisition of the running speed information of the first stand of the finishing mill, the running speed information including the roll linear speed obtained by the speed encoder installed on the F1 mill motor, and the mill entry workpiece speed obtained by the speed encoder installed on the pinch roll at the exit of the finishing mill descaling box; S2. Based on the operating speed information obtained in S1, calculate and set the target value of the roughing mill workpiece exit speed under different rolling stages, as well as the step speed control reference value of the roller table in each area from the roughing mill exit to the finishing mill inlet. S3. Based on the target speed value and the stepped speed control reference value set in S2, the roughing mill, finishing mill, and each section of the roller table are controlled in a coordinated manner. Specifically, the speed of the roughing mill motor is controlled to match the target speed of the roughing mill workpiece exit, the finishing mill is controlled to operate in the speed-up rolling mode, and each section of the roller table is controlled to operate according to the stepped speed control reference value, so that the exit speed of the roughing mill and the entry bite speed of the first stand of the finishing mill are kept synchronously matched.

2. The method for matching the continuous rolling speeds of the roughing mill and the finishing mill according to claim 1, characterized in that, In S2, the different rolling stages include the first stage from the completion of the flying shear head to the biting of the first stand of the finishing mill, and the second stage after the biting of the first stand of the finishing mill. In the first stage, the target value v of the workpiece exit speed of the roughing mill is set. f Satisfy: v f = v r1 Δm1, where v r1 Δm1 is the linear velocity of the rolls before the first stand of the finishing mill bites the steel, and Δm1 is the first speed adjustment parameter. In the second stage, the target value v of the workpiece exit speed of the roughing mill is set. f Satisfy: v f =v r2 Δm2, where v r2 Δm2 is the speed of the rolled piece after the first stand of the finishing mill bites the steel, based on the feedback from the speed measuring roller at the exit of the descaling box; Δm2 is the second speed adjustment parameter. Among them, Δm1 and Δm2 both include the friction coefficient correction value, the correction value K and the steel plate micro-tension control value, where K is 0.01~0.

06.

3. The method for matching the continuous rolling speeds of the roughing mill and the finishing mill according to claim 2, characterized in that, In S2, the stepped speed control reference value for each section of the roller conveyor is based on v. r2 And set the corresponding speed control parameter α; Each section of the roller conveyor includes: the first section of the roughing mill exit roller conveyor, the second section of the roller conveyor, the third section of the roller conveyor, the roller conveyor in the hot coil box area, and the roller conveyor in the flying shear and finishing mill descaling box area; The speed control reference value for the first section of the roller conveyor is v. D1 =v r2 α1; The speed control reference value for the second section of the roller conveyor is v. D2 =v r2 α2; The speed control reference value for the third section of the roller conveyor is v. D3 =v r2 α3; The reference value for the speed control of the roller conveyor in the hot roll box area is v D4 =vr2 α4; The reference value for speed control of the flying shear and finishing mill descaling box roller conveyor is v D5 =v r2 α5; Among them, α1~α5 are the speed control parameters of each section of the roller table from the exit of the roughing mill to the front of the finishing mill.

4. The method for matching the continuous rolling speeds of the roughing mill and the finishing mill according to claim 3, characterized in that: The specific tension control for maintaining the roughing mill exit speed and the finishing mill inlet bite speed is as follows: in D1 ≧v f in D5 ≦in r2 。 5. The method for matching the continuous rolling speeds of the roughing mill and the finishing mill according to claim 1, characterized in that, The control calculation formula for the target value n of the roughing mill motor speed is as follows: v r =v f H / (1.25H-0.25h) (1+R)% n=v r 60 / π D Where: n is the speed of the roughing mill motor, v r v is the linear velocity of the roughing mill rolls. f Here, H is the target value for the exit speed of the roughing mill, h is the thickness of the billet at the entry point of the roughing mill, r is the correction parameter for the exit speed of the roughing mill, and D is the diameter of the rolls of the roughing mill.

6. The method for matching the continuous rolling speeds of the roughing mill and the finishing mill according to claim 1, characterized in that, In S3, the speed-up rolling control process of the finishing mill includes: finishing mill start-up control, strip threading speed setting, and speed-up rolling after all stands have completed strip threading.

7. The method for matching the continuous rolling speeds of the roughing mill and the finishing mill according to claim 1, characterized in that, The speed of the roller conveyors in the flying shear and finishing mill descaling box areas is based on the stepped speed control reference value v. D5 To take control.

8. The method for matching the continuous rolling speeds of the roughing mill and the finishing mill according to claim 1, characterized in that, After the flying shear head is completed, the linear speed v of the first stand of the finishing mill is used as the basis for the calculation. r1 The change in the rolling mill speed (v) is adjusted in real time to control the exit speed of the workpiece in the first stage. f v f This refers to adjusting the speed n of the roughing mill motor.

9. The method for matching the continuous rolling speeds of a roughing mill and a finishing mill according to claim 1, characterized in that, When the length of the intermediate billet is greater than the distance between the first finishing mill and the last roughing mill, a method of matching the continuous rolling speeds of the roughing mill and the finishing mill is adopted.

Images