CN116371938A - Tandem rolling tension control method for double-frame reversible roughing mill - Google Patents

Tandem rolling tension control method for double-frame reversible roughing mill Download PDF

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CN116371938A
CN116371938A CN202310372744.5A CN202310372744A CN116371938A CN 116371938 A CN116371938 A CN 116371938A CN 202310372744 A CN202310372744 A CN 202310372744A CN 116371938 A CN116371938 A CN 116371938A
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rolling
mill
roughing mill
roughing
speed
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任晓怀
宗胜悦
黄硕
张飞
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USTB Design and Research Institute Co Ltd
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USTB Design and Research Institute Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/48—Tension control; Compression control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

The invention discloses a tandem rolling tension control method of a double-frame reversible roughing mill, which comprises the steps of selecting a speed reference roughing mill based on rolling passes; calculating the speed cascade coefficients of other rolling mills; the vertical rolling mill detects biting, acquires a first rolling force and a first motor torque and calculates an average value in real time; the non-speed reference roughing mill detects biting, acquires second rolling force and second motor torque, calculates average values in real time, and simultaneously locks the average values of the first rolling force and the first motor torque so as to control the tension of the vertical rolling mill and the non-speed reference roughing mill; the speed reference roughing mill detects biting, acquires the third rolling force and the third motor torque, calculates average values in real time, and simultaneously locks the second rolling force and the second motor torque average value so as to enable tension control between roughing mills. The method is simple to realize, can realize micro-tension control between rolling mills without adding extra hardware, and effectively improves the stability of continuous rolling tension of the double-frame roughing mill.

Description

Tandem rolling tension control method for double-frame reversible roughing mill
Technical Field
The invention relates to the technical field of metal processing, in particular to a continuous rolling tension control method of a double-frame reversible roughing mill.
Background
The hot continuous rolling production line of the plate and strip is generally composed of a heating furnace, a roughing mill, a finishing mill and an underground coiling machine, wherein the roughing mill is a reversible mill, a plate blank is rolled into an intermediate blank with a certain thickness through multi-pass reversible rolling, and then the intermediate blank is sent to the finishing mill for continuous rolling. In order to improve the rolling efficiency of the roughing mill, a tandem roughing mill set is formed by adopting a double-frame roughing mill, and the rolling pass of the roughing mill is reduced from 5-7 times to 3 times, so that the rolling time is shortened, and the rolling efficiency is improved.
In the continuous rolling process of the roughing mill, tension is generated between the vertical rolling mill and the roughing mill as well as between the roughing mill, and in order to ensure the smooth running of production, a micro tension control mode is generally adopted for tension between frames. Because the dynamic speed of biting steel drops, a front-back sliding calculation model is inaccurate, a rolling mill slips, the thickness of a slab changes, the temperature changes and the like, tension between frames changes, if the tension is too large, the load of a downstream frame rolling mill is easily increased, mechanical equipment is damaged, and meanwhile, the slab is possibly narrowed, so that the product quality is influenced; if the tension is too small, the load of an upstream stand rolling mill is easily increased, meanwhile, the problem of warping and buckling of a slab is easily caused, the roller way is damaged, and production accidents are caused. Therefore, constant micro-tension between the frames of the tandem roughing mill is critical for the smooth production of the roughing mill. At present, the micro-tension control between a single-frame roughing mill and a vertical rolling mill calculates the tension deviation through a torque sampling memory method or a torque ratio memory method, and then adjusts the speed of the vertical rolling mill, so that the tension is kept constant.
Accordingly, there is a need in the art for an improved method of controlling tandem rolling tension in a double stand reversible roughing mill.
Disclosure of Invention
In view of the above, an object of the embodiments of the present invention is to provide a tandem rolling tension control method for a double-stand reversible roughing mill, which is simple to implement, and can realize micro-tension control between rolling mills without adding additional hardware, thereby effectively improving the stability of tandem rolling tension of the double-stand roughing mill.
Based on the above object, the embodiment of the invention provides a tandem rolling tension control method of a double-frame reversible roughing mill, which comprises the following steps:
s1, selecting a speed reference roughing mill based on rolling pass;
s2, calculating speed cascade coefficients of a non-speed reference roughing mill and a vertical roller mill;
s3, after starting rolling, responding to the fact that the vertical rolling mill detects starting biting, collecting a first rolling force and a first motor torque, and calculating an average value in real time;
s4, responding to the detection of the start of biting of the non-speed reference roughing mill, collecting a second rolling force and a second motor torque, calculating an average value in real time, simultaneously locking a first rolling force average value and a first motor torque average value of the vertical rolling mill, dynamically adjusting the torque of the vertical rolling mill, and enabling tension control of the vertical rolling mill and the non-speed reference roughing mill;
s5, responding to the detection of the start of biting of the speed reference roughing mill, collecting a third rolling force and a third motor torque, calculating an average value in real time, simultaneously locking a second rolling force average value and a second motor torque average value of the non-speed reference roughing mill, and dynamically adjusting the speed value of the non-speed reference roughing mill to enable tension control among the roughing mills.
In some embodiments, in S2, the speed cascade coefficient calculation formula is:
Figure BDA0004169196030000021
wherein K is R The speed cascade coefficient of the roughing mill; k (K) E The speed cascade coefficient of the vertical roller mill; f is a speed reference roughing mill forward slip value; f (f) R A forward slip value of the roughing mill is a non-speed reference; h is the outlet thickness of the speed reference rolling mill; h is a R Is the outlet thickness of the non-speed reference rolling stand; h is the thickness of the incoming material of the slab; beta is the speed lead coefficient of the vertical roller mill,the value range of beta is 1.1-1.8.
In some embodiments, in S4 and S5, the rolling force and motor torque average value is calculated by a sliding average value, and the calculation formula is:
Figure BDA0004169196030000031
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure BDA0004169196030000032
is the rolling force average value; f (F) i The rolling force value acquired for the ith period; />
Figure BDA0004169196030000033
Is the average value of motor torque; m is M i Motor torque values acquired for the ith period; n is the number of cycles of the acquired data; m is the number of sliding average terms.
In some embodiments, the running average term m is calculated as:
Figure BDA0004169196030000034
wherein alpha is an item number adjustable factor, and the value range of alpha is 0.2-0.8; l is the distance between rolling mills; v is the threading speed of the rolling mill; t is t i A data acquisition period.
In some embodiments, in S4, tension control between the edger and roughing mill is implemented by torque adjustment, tension is constant by dynamically adjusting the torque set point of the edger, and tension control torque M E The calculation formula is as follows:
Figure BDA0004169196030000035
wherein F is E The actual rolling force value of the vertical rolling mill;
Figure BDA0004169196030000036
the rolling force average value of the locked vertical roller mill; />
Figure BDA0004169196030000037
The torque average value of the locked vertical roller mill motor is; t (T) 1 Setting a tension value between the vertical rolling mill and the roughing mill; d (D) E Is the diameter of a roller of a vertical roller mill.
In some embodiments, when the tension control of the edger is not enabled, the edger motor torque set point is rated torque, and after the edger tension control is enabled, the edger motor torque set point is switched to the tension control torque M E 。
In some embodiments, in S5, tension control between roughing mills adopts a speed adjustment mode, and tension is constant by dynamically adjusting a speed value of a non-speed reference roughing mill, wherein a calculation formula of a speed adjustment value Δv is as follows:
Δv＝K p ·ΔT+K i ·ΣΔT
Figure BDA0004169196030000041
wherein K is P A scaling factor; k (K) i Is an integral coefficient; delta T is the tension deviation between roughing mills; f (F) R The actual rolling force value of the roughing mill; m is M R The actual torque value of the roughing mill motor;
Figure BDA0004169196030000042
the rolling force average value of the locked roughing mill; />
Figure BDA0004169196030000043
The average value of the torque of the locked roughing mill motor is obtained; t (T) 2 Setting the tension between roughing mills; d (D) R Is the diameter of a roughing mill roller.
In some embodiments, in S1, the rolling passes are three times, including an odd pass and an even pass, the rolling directions of the odd pass and the even pass being opposite.
In some embodiments, the speed reference roughing mill is selected as the last roughing mill in the rolling direction based on the rolling pass.
In some embodiments, the dual-stand reversible roughing mill is connected to a PLC control system, by which it is detected whether the mill bites in and data of rolling force, motor torque are collected in response to the mill bite.
The invention has at least the following beneficial technical effects:
the last rolling mill in the rolling direction is selected as the speed reference rolling mill, so that the stability of the rolling process speed is ensured, meanwhile, the rolling force and the motor torque value of the rolling mill are collected after the rolling mill bites, the average value of the rolling mill is calculated by adopting a calculation mode of a sliding average value, and the rolling state of the head of a plate blank can be accurately locked when the head of the plate blank enters a downstream rolling mill, so that the tension value between rolling mills is calculated more accurately. Meanwhile, the tension between the vertical rolling mill and the roughing mill adopts a torque adjustment mode, so that the problem of overlarge or overlarge tension caused by inaccurate speed cascade coefficients is avoided, and the tension between the roughing mill adopts a speed adjustment mode, so that the tension can be adjusted more quickly, and the stability of the tension is ensured. The method is simple to realize, can realize micro-tension control between rolling mills without adding extra hardware, and effectively improves the stability of continuous rolling tension of the double-frame roughing mill.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of an embodiment of a double stand reversible roughing mill apparatus arrangement provided by the present invention;
FIG. 2 is a flow chart of an embodiment of a tandem rolling tension control method for a double stand reversible roughing mill provided by the present invention;
fig. 3 is a schematic view of an embodiment of a rolling process provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
The terms "comprising" and "having" and any variations thereof in the description of the invention and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion; the terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. The meaning of "a plurality of" is two or more, unless specifically defined otherwise.
In the description of the invention and the claims and the above figures, when an element is referred to as being "fixed" or "mounted" or "disposed" or "connected" to another element, it can be directly or indirectly on the other element. For example, when an element is referred to as being "connected to" another element, it can be directly or indirectly connected to the other element.
Furthermore, references herein to "an embodiment" mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The roughing tandem rolling train shown in fig. 1 comprises a vertical roll mill E1, a roughing mill R2 and a vertical roll mill E2 which are connected in sequence. When a slab is rolled in odd passes, tension is established between a vertical roller E1 and a roughing mill R1 to form continuous rolling, tension is established between the roughing mill R1 and the roughing mill R2 to form continuous rolling, and the vertical roller E2 is opened; when the slab is rolled in even pass, the tension is established between the vertical rolling mill E2 and the roughing mill R2 to form continuous rolling, then the tension is established between the roughing mill R2 and the roughing mill R1 to form continuous rolling, and the vertical rolling mill E1 is opened. The tandem roughing mill stand is relatively complex, and how to coordinate the micro-tension control among a plurality of stands is an urgent problem to be solved by the roughing tandem mill set.
Accordingly, as shown in fig. 2, the present invention provides a tandem rolling tension control method of a double-stand reversible roughing mill, comprising the steps of:
s1, selecting a speed reference roughing mill based on rolling pass;
s2, calculating speed cascade coefficients of a non-speed reference roughing mill and a vertical roller mill;
s3, after starting rolling, responding to the fact that the vertical rolling mill detects starting biting, collecting a first rolling force and a first motor torque, and calculating an average value in real time;
s4, responding to the detection of the start of biting of the non-speed reference roughing mill, collecting a second rolling force and a second motor torque, calculating an average value in real time, simultaneously locking a first rolling force average value and a first motor torque average value of the vertical rolling mill, dynamically adjusting the torque of the vertical rolling mill, and enabling tension control of the vertical rolling mill and the non-speed reference roughing mill;
s5, responding to the detection of the start of biting of the speed reference roughing mill, collecting a third rolling force and a third motor torque, calculating an average value in real time, simultaneously locking a second rolling force average value and a second motor torque average value of the non-speed reference roughing mill, and dynamically adjusting the speed value of the non-speed reference roughing mill to enable tension control among the roughing mills.
Further, the first rolling force and the first motor torque are parameters of the vertical rolling mill, the second rolling force and the second motor torque are parameters of the non-speed reference roughing mill, and the third rolling force and the third motor torque are parameters of the speed reference roughing mill.
Further, in S1, the rolling passes are three times, including an odd pass and an even pass, and the rolling directions of the odd pass and the even pass are opposite. The speed reference roughing mill is selected as the last roughing mill in the rolling direction based on the current rolling pass.
Further, in S2, the speed cascade coefficient calculation formula is:
Figure BDA0004169196030000061
wherein K is R The speed cascade coefficient of the roughing mill; k (K) E The speed cascade coefficient of the vertical roller mill; f is a speed reference roughing mill forward slip value; f (f) R A forward slip value of the roughing mill is a non-speed reference; h is the outlet thickness of the speed reference rolling mill; h is a R Is the outlet thickness of the non-speed reference rolling stand; h is the thickness of the incoming material of the slab; beta is the speed lead coefficient of the vertical roller mill, and the value range of beta is 1.1-1.8.
Further, in S3, the double-stand reversible roughing mill is connected to a PLC control system, and whether the mill bites is detected by the PLC control system, and data of rolling force and motor torque are collected in response to the bite of the mill.
Further, in S4 and S5, the rolling force and motor torque average value adopts a sliding average value calculation mode, and the calculation formula is:
Figure BDA0004169196030000071
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure BDA0004169196030000072
is the rolling force average value; f (F) i The rolling force value acquired for the ith period; />
Figure BDA0004169196030000073
Is the average value of motor torque; m is M i Motor torque values acquired for the ith period; n is the number of cycles of the acquired data; m is the number of sliding average terms.
The calculation formula of the sliding average term number m is:
Figure BDA0004169196030000074
wherein alpha is the number of itemsAdjusting factor, and alpha value range is 0.2-0.8; l is the distance between rolling mills; v is the threading speed of the rolling mill; t is t i A data acquisition period.
Further, in S4, tension control between the edger and roughing mill is performed by torque adjustment, and tension is kept constant by dynamically adjusting the torque setting value of the edger, and tension control torque M E The calculation formula is as follows:
Figure BDA0004169196030000075
wherein F is E The actual rolling force value of the vertical rolling mill;
Figure BDA0004169196030000076
the rolling force average value of the locked vertical roller mill; />
Figure BDA0004169196030000077
The torque average value of the locked vertical roller mill motor is; t (T) 1 Setting a tension value between the vertical rolling mill and the roughing mill; d (D) E Is the diameter of a roller of a vertical roller mill.
Further, when the tension control of the vertical roller mill is not enabled, the motor torque set value of the vertical roller mill is set to be rated torque, and after the tension control of the vertical roller mill is enabled, the motor torque set value of the vertical roller mill is switched to be tension control torque M E 。
Further, in S5, the tension control between roughing mills adopts a speed adjustment mode, and the constant tension is achieved by dynamically adjusting the speed value of the non-speed reference roughing mill, and the calculation formula of the speed adjustment value Δv is:
Δv＝K p ·ΔT+K i ·ΣΔT
Figure BDA0004169196030000081
wherein K is P A scaling factor; k (K) i Is an integral coefficient; delta T is the tension deviation between roughing mills; f (F) R The actual rolling force value of the roughing mill; m is M R The actual torque value of the roughing mill motor;
Figure BDA0004169196030000082
the rolling force average value of the locked roughing mill; />
Figure BDA0004169196030000083
The average value of the torque of the locked roughing mill motor is obtained; t (T) 2 Setting the tension between roughing mills; d (D) R Is the diameter of a roughing mill roller.
The invention will be further explained below with reference to specific examples.
Example 1
The scheme is implemented on a 1450mm plate and strip hot continuous rolling roughing mill unit of a certain factory, the roughing mill unit comprises two vertical rolling mills E1 and E2, the distance between the E1 and the R1 is 310mm, the distance between the R1 and the R2 is 5740mm, the distance between the R2 and the E2 is 3100mm, the roller diameter between the R1 and the R2 is 1170mm, and the roller diameter between the E1 and the E2 is 850mm. As shown in fig. 3, the roughing mill group performs 3-pass rolling, and the 1 st-pass rolling process is taken as an example, and the specific embodiment is as follows:
s1, selecting R2 as a speed reference rolling mill in the 1 st pass;
s2, calculating speed cascade coefficients of other rolling mills, wherein the calculation formula is as follows:
Figure BDA0004169196030000084
wherein K is R The speed cascade coefficient of the roughing mill; k (K) E The speed cascade coefficient of the vertical roller mill; f is a speed reference roughing mill forward slip value; f (f) R A forward slip value of the roughing mill is a non-speed reference; h is the outlet thickness of the speed reference rolling mill; h is a R Is the outlet thickness of the non-speed reference rolling stand; h is the thickness of the incoming material of the slab; beta is the speed lead coefficient of the vertical roller mill, and the value of beta is 1.2.
S3, when E1 bites, starting to collect the first rolling force and the first motor torque, and calculating the average value of the first rolling force and the first motor torque in real time, wherein the calculation formula is as follows:
Figure BDA0004169196030000091
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure BDA0004169196030000092
is the rolling force average value; f (F) i The rolling force value acquired for the ith period; />
Figure BDA0004169196030000093
Is the average value of motor torque; m is M i Motor torque values acquired for the ith period; n is the number of cycles of the acquired data; m is the number of sliding average terms, and the calculation formula of m is:
Figure BDA0004169196030000094
wherein α is a term number adjustable factor, α=0.4; l is the distance between rolling mills; v is the threading speed of the rolling mill; t is t i A data acquisition period.
S4, when R1 bites, collecting the second rolling force and the second motor torque, calculating the average value of the second rolling force and the second motor torque in real time, and locking the average value of the rolling force and the motor torque of E1 simultaneously in the same calculation process as E1, so that tension control between E1 and R1 is enabled.
Tension control torque M of E1 E The calculation formula is as follows:
Figure BDA0004169196030000095
wherein F is E The actual rolling force value of the vertical rolling mill;
Figure BDA0004169196030000096
the rolling force average value of the locked vertical roller mill; />
Figure BDA0004169196030000097
The torque average value of the locked vertical roller mill motor is; t (T) 1 Setting a tension value between the vertical rolling mill and the roughing mill; d (D) E Is the diameter of a roller of a vertical roller mill.
S5, when R2 bites, locking a second rolling force of R1 and a second motor torque average value, enabling tension control between R1 and R2, and calculating a speed adjustment value Deltav:
Δv＝K p ·ΔT+K i ·∑ΔT
Figure BDA0004169196030000098
wherein K is P A scaling factor; k (K) i Is an integral coefficient; delta T is the tension deviation between roughing mills; f (F) R The actual rolling force value of the roughing mill; m is M R The actual torque value of the roughing mill motor;
Figure BDA0004169196030000101
the rolling force average value of the locked roughing mill; />
Figure BDA0004169196030000102
The average value of the torque of the locked roughing mill motor is obtained; t (T) 2 Setting the tension between roughing mills; d (D) R Is the diameter of a roughing mill roller.
After the continuous rolling tension control method of the double-frame reversible roughing mill is adopted by the continuous rolling roughing mill for 1450mm plate strips, the problems of severe current change, slab narrowing, slipping and the like of a mill motor caused by tension fluctuation among frames are effectively solved, the impact and damage of the tension fluctuation to equipment are reduced, and the effect is obvious.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the disclosure as defined by the appended claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
It should be understood that as used herein, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly supports the exception. It should also be understood that "and/or" as used herein is meant to include any and all possible combinations of one or more of the associated listed items.
The foregoing embodiment of the present invention has been disclosed with reference to the number of embodiments for the purpose of description only, and does not represent the advantages or disadvantages of the embodiments.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and many other variations of the different aspects of the embodiments of the invention as described above exist, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the embodiments should be included in the protection scope of the embodiments of the present invention.

Claims (10)

1. The continuous rolling tension control method of the double-frame reversible roughing mill is characterized by comprising the following steps of:
s1, selecting a speed reference roughing mill based on rolling pass;
s2, calculating speed cascade coefficients of a non-speed reference roughing mill and a vertical roller mill;
s3, after starting rolling, responding to the fact that the vertical roller mill detects starting biting, collecting a first rolling force and a first motor torque, and calculating an average value in real time;
s4, responding to the fact that the non-speed reference roughing mill detects the start of biting, collecting second rolling force and second motor torque, calculating average values in real time, simultaneously locking a first rolling force average value and a first motor torque average value of the vertical rolling mill, dynamically adjusting the torque of the vertical rolling mill, and enabling tension control of the vertical rolling mill and the non-speed reference roughing mill;
s5, responding to the detection of the start of biting of the speed reference roughing mill, collecting a third rolling force and a third motor torque, calculating average values in real time, simultaneously locking a second rolling force average value and a second motor torque average value of the non-speed reference roughing mill, and dynamically adjusting the speed value of the non-speed reference roughing mill to enable tension control among the roughing mills.
2. The tandem rolling tension control method of a twin stand reversible roughing mill according to claim 1, wherein in S2, a speed cascade coefficient calculation formula is:
Figure FDA0004169196010000011
wherein K is R The speed cascade coefficient of the roughing mill; k (K) E The speed cascade coefficient of the vertical roller mill; f is a speed reference roughing mill forward slip value; f (f) R A forward slip value of the roughing mill is a non-speed reference; h is the outlet thickness of the speed reference rolling mill; h is a R Is the outlet thickness of the non-speed reference rolling stand; h is the thickness of the incoming material of the slab; beta is the speed lead coefficient of the vertical roller mill, and the value range of beta is 1.1-1.8.
3. The continuous rolling tension control method of a double-stand reversible roughing mill according to claim 1, wherein in S4 and S5, rolling force and motor torque average values are calculated by adopting a sliding average value calculation method, and a calculation formula is:
Figure FDA0004169196010000012
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure FDA0004169196010000021
is the rolling force average value; f (F) i Sampling for the ith periodRolling force values of the set; />
Figure FDA0004169196010000022
Is the average value of motor torque; m is M i Motor torque values acquired for the ith period; n is the number of cycles of the acquired data; m is the number of sliding average terms.
4. The continuous rolling tension control method of a double-stand reversible roughing mill according to claim 3, wherein the calculation formula of the number m of terms of the sliding average value is:
Figure FDA0004169196010000023
wherein alpha is an item number adjustable factor, and the value range of alpha is 0.2-0.8; l is the distance between rolling mills; v is the threading speed of the rolling mill; t is t i A data acquisition period.
5. The continuous rolling tension control method of double-frame reversible roughing mill according to claim 1, wherein in S4, tension control between the vertical rolling mill and the roughing mill adopts a torque adjustment mode, tension is constant by dynamically adjusting a torque set value of the vertical rolling mill, and tension control torque M E The calculation formula is as follows:
Figure FDA0004169196010000024
wherein F is E The actual rolling force value of the vertical rolling mill;
Figure FDA0004169196010000025
the rolling force average value of the locked vertical roller mill; />
Figure FDA0004169196010000026
The torque average value of the locked vertical roller mill motor is; t (T) 1 Is a vertical rollerA tension set value between the rolling mill and the roughing mill; d (D) E Is the diameter of a roller of a vertical roller mill.
6. The method according to claim 5, wherein when the tension control of the vertical roll mill is not enabled, the motor torque set value of the vertical roll mill is set to a rated torque, and the motor torque set value of the vertical roll mill is switched to a tension control torque M in response to the enabling of the tension control of the vertical roll mill E 。
7. The continuous rolling tension control method of a double-stand reversible roughing mill according to claim 1, wherein in S5, tension control between roughing mills adopts a speed adjustment mode, tension is constant by dynamically adjusting a speed value of the non-speed reference roughing mill, and a calculation formula of a speed adjustment value Δv is:
Δv＝K p ·ΔT+K i ·ΣΔT
Figure FDA0004169196010000027
wherein K is P A scaling factor; k (K) i Is an integral coefficient; delta T is the tension deviation between roughing mills; f (F) R The actual rolling force value of the roughing mill; m is M R The actual torque value of the roughing mill motor;
Figure FDA0004169196010000031
the rolling force average value of the locked roughing mill; />
Figure FDA0004169196010000032
The average value of the torque of the locked roughing mill motor is obtained; t (T) 2 Setting the tension between roughing mills; d (D) R Is the diameter of a roughing mill roller.
8. The tandem rolling tension control method of a double stand reversible roughing mill according to claim 1, wherein in S1, the rolling passes are three times, including an odd pass and an even pass, and the rolling directions of the odd pass and the even pass are opposite.
9. The method according to claim 8, wherein the speed reference roughing mill is selected as the last roughing mill in the rolling direction based on the rolling pass.
10. The method for controlling continuous rolling tension of a double-stand reversible roughing mill according to claim 1, wherein the double-stand reversible roughing mill is connected with a PLC control system, and whether the rolling mill bites is detected by the PLC control system, and data of rolling force and motor torque are collected in response to the rolling mill bites.
CN202310372744.5A 2023-04-10 2023-04-10 Tandem rolling tension control method for double-frame reversible roughing mill Pending CN116371938A (en)

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