CN114505353B - Same-plate-difference channeling roll feedforward static control method - Google Patents

Same-plate-difference channeling roll feedforward static control method Download PDF

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CN114505353B
CN114505353B CN202210111593.3A CN202210111593A CN114505353B CN 114505353 B CN114505353 B CN 114505353B CN 202210111593 A CN202210111593 A CN 202210111593A CN 114505353 B CN114505353 B CN 114505353B
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convexity
roll
strip steel
value
head
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CN114505353A (en
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于浩
张文
张理扬
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Shanghai Baosight Software Co Ltd
Baosteel Zhanjiang Iron and Steel Co Ltd
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Shanghai Baosight Software Co Ltd
Baosteel Zhanjiang Iron and Steel 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/165—Control of thickness, width, diameter or other transverse dimensions responsive mainly to the measured thickness of the product
    • 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
    • B21B37/16—Control of thickness, width, diameter or other transverse dimensions
    • B21B37/18—Automatic gauge control
    • B21B37/20—Automatic gauge control in tandem mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B2261/00—Product parameters
    • B21B2261/02—Transverse dimensions
    • B21B2261/04—Thickness, gauge
    • 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
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

The invention discloses a feed-forward static control method for a same-plate-difference channeling roll, which is used for a five-rack cold continuous rolling mill, wherein a convexity meter is arranged at an inlet of the rolling mill set and used for detecting convexity values of hot-rolled incoming strip steel; when the welding seam reaches the convexity meter, the convexity meter feeds back an actual measurement value of the convexity of the head of the incoming material to a process control computer of the unit, calculates convexity deviation of the head of the strip steel according to the convexity history information of the head of the strip steel of the specification, determines roll shifting compensation values of working rolls of the frames 1# to 3# and conditionally outputs the roll shifting compensation values; the invention meets the requirement of a user on the same plate difference roller shifting feedforward static control technology of the same plate difference level through the section detection of the inlet convexity meter based on the cold continuous rolling mill unit, and the roller shifting calculated value of each frame is subjected to real-time feedforward control, so that the same plate difference control level of the cold-rolled strip steel is improved. The method of the invention can be used for various multi-rack cold continuous rolling mill systems with different plate difference control capability levels, so that the method can be widely applied to the cold rolling mill set which adopts working roll shifting to control the same plate difference and is provided with a convexity meter in front of the rolling mill at present.

Description

Same-plate-difference channeling roll feedforward static control method
Technical Field
The invention relates to the technical field of metallurgical machinery/pickling rolling, in particular to a roll shifting control method of a cold rolling tandem rolling finishing mill group.
Background
Edge Drop (Edge Drop, also called Edge thinning) of a cold-rolled product is an important parameter of a dimensional accuracy index. The traditional definition of Edge drop is the difference of the thickness tA at a position 100mm from the Edge minus the thickness tB at a position 15mm from the Edge, edge drop=ta-tB.
However, with the continuous improvement of the product quality requirements of the current users, the conventional Edge drop definition is difficult to meet the requirements, and when the control level of the conventional Edge drop completely meets the unit control requirements, the situation that the requirements of the users on the section shape still cannot be met frequently occurs. Therefore, the edge drop concept is expanded to the same plate difference in the conventional cold rolling units for producing high edge drop requirements, namely the difference of the thickness HC of the center point of the strip steel minus the thickness H15 at a position 15mm away from the edge is the same plate difference (edge drop) =HC-H15
The edge drop value obtained by calculation can truly reflect the thickness difference in the full-plate width range, and is an excellent index for representing the accuracy control capability of the unit.
The advanced UCMW type or UCM type rolling mill in the current world mainly adopts a working roll play feedback control system in the control of edge drop, and the main control thinking is to compensate the edge thinning area by using a working roll with chamfer or special arc or middle roll play so as to reduce the edge drop value. The specific implementation method of the corresponding system is to adjust the play level of the roller according to the comparison between the measured data of the outlet edge drop instrument of the rolling mill and the set threshold value. When the detected current same-plate difference value is larger than a system set threshold value, a feedback control system outputs a roller shifting command, and in the roller shifting process, a shifting executing mechanism is executing a corresponding task due to the fact that the working roller shifting is related to the current speed, so that new shifting commands cannot be continuously received. After the executing mechanism completes the corresponding movement, the receiving system outputs the instruction again, which has obvious lag and increases the edge drop length section.
However, with increasing demands of users on product quality, user complaints of the cold rolling production line in the aspect of edge drop at present show increasing trend, and it is particularly important to realize the whole roll shifting feedforward static control.
The prior art has the problems that:
1. the requirements on the same plate difference of cold-rolled products, particularly motor industry for laminated cold-rolled silicon steel products, are extremely high, and the common roller bending mode at present can control the same plate difference to a certain extent, but has a larger gap with the requirements of users.
2. The method for controlling the same plate difference is an important supplementary means besides the roll bending of the roll. By establishing and transitional the head stable set value, the length of out-of-tolerance caused by inaccurate head and tail set play positions is reduced, and the primary accuracy hit rate of the thickness of the edge is greatly improved.
After looking up the related literature data and searching online in the middle and outer patent database service platform, two typical patents, 1 and patent number CN106975663A, are queried in the same field, and the names are as follows: the invention discloses a rolling mill roll shifting control method for solving the problem of edge thickening, and mainly relates to a roll shifting control method for realizing the situation that the thickness of an edge exceeds the thickness of a center. 2. Patent number CN105436208A, name: the invention relates to an edge drop control method in a rolling process, which mainly relates to the optimization related content of the use and adjustment quantity of two control methods when roll bending control and roll shifting control are simultaneously carried out, and belongs to a selection and adjustment method of an edge drop control mode, wherein the method is obviously different from a method for implementing a specific control strategy only on roll shifting, which is realized by the method.
Disclosure of Invention
The invention aims to realize automatic control of roller movement in the rolling process by system analysis of the same plate difference control process so as to fully exert the capability of the roller movement in controlling the same plate difference, improve the total level of the same plate difference control of a cold-rolled product and improve the quality level of a real object.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a feed-forward static control method for a same-plate-difference channeling roll is used for a five-frame cold continuous rolling mill, and a convexity meter is arranged at an inlet of the rolling mill unit and used for detecting convexity values of hot-rolled incoming strip steel; when the welding seam reaches the convexity meter, the convexity meter feeds back the actual measurement value of the convexity of the head of the incoming material to the process control computer of the unit, calculates the convexity deviation of the head of the strip steel according to the convexity history information of the head of the strip steel of the specification, determines the roll-shifting compensation value of the working rolls of each frame 1# to 3# and conditionally outputs the roll-shifting compensation value, and specifically comprises the following steps:
step one, calculating the convexity value of the head of the current strip steel incoming material:
C avg ＝C sum formula II/n
Wherein C is sum Collecting the sum of periodic convexities for each convexity; c (C) avg The average value of convexities of the head of the strip steel incoming material;
k is a convexity acquisition period; h ck The intermediate thickness measurement value of the strip steel in the period k is measured;
H 15k the thickness measurement value is 15mm from the edge of the strip steel in the period k;
step two, calculating the convexity deviation of the head of the strip steel:
ΔC＝C avg -C prev formula III
Wherein, delta C is the convexity deviation value of the strip steel; c (C) prev Is a historical reference value of convexity of the head of the strip steel with the same specification;
step three, calculating a roll shifting compensation value of the working roll:
ΔWr cal ＝ΔC/K coWr +K com equation four
Wherein DeltaWr cal A roll shifting compensation value for the working roll; k (K) coWr The roll shifting efficiency coefficient is the working roll shifting efficiency coefficient;
K com weighting coefficients for the rolls;
step four, determining roll shifting compensation values of the working rolls of the frames:
ΔIr i ＝ΔWr cal *K cori formula five
Wherein K is cori Assigning coefficients to the i racks;
fifthly, checking the outlet edge drop and conditionally outputting roll shifting compensation values delta Ir of the working rolls of the frames i ：
E dr ＝K FbWr *K Fbr *ΔW r cal+K Fbuc Formula six
Wherein E is dr A predicted value for the drop change of the outlet of the frame; k (K) FbWr The roll edge drop influence coefficient is the roll bending coefficient of the working roll;
K Fbr the roll shape influence coefficient is the working roll; k (K) Fbuc Is a compensation coefficient;
when E is dr When the amplitude limit of the edge drop change is smaller than that of the amplitude limit, the roll shifting compensation value delta Ir of each rack working roll is output i 。
The beneficial effects of the invention are as follows: the invention controls the same plate difference of the strip steel through researching and developing a roller shifting control system suitable for a multi-rack cold continuous rolling mill, and improves the total level of the same plate difference control of the cold-rolled product. Compared with the common plate difference control system commonly used at present, the system has the main advantages that:
(1) The control mode is more in line with the field requirement
The common plate difference control system is an important control means. The edge thinning area is compensated for by using a work roll or intermediate roll play with a chamfer or special arc to reduce the on-board differential. However, as the currently used main roll-shifting control set value is fed back to the control system by the rear edge drop instrument after the same plate difference is measured, the calculated value is sent to the actuating mechanism, and the condition of roll-shifting adjustment lag caused by insufficient rolling speed is easy to occur. Therefore, the current control mode can rapidly detect the same plate difference and send the set value to the executing mechanism to improve the response speed and the control level of the same plate difference.
(2) The calculation mode is more accurate
In the conventional roller shifting control system, the same plate difference is measured through a rear edge drop instrument, and when the same plate difference is larger than a preset value, a set value is fed back to the frame to perform roller shifting control. The roll shifting control system provided in the invention predicts the deviation value of the same plate difference of the outlet of the stand and the target same plate difference according to the convexity actual result data of the strip steel at the inlet of the stand and the actual result value of the rolling parameter of the stand, and determines the compensation quantity of the roll shifting set value of the working roll of the stand, so that the deviation value of the same plate difference of the outlet of the stand is minimum.
The invention improves the same plate difference control level of the cold-rolled strip steel by the same plate difference roller-shifting feedforward static control technology based on the section detection of the inlet convexity meter of the cold continuous rolling unit and meeting the user requirement of the same plate difference level and the real-time feedforward control of roller shifting calculated values of each rack. The idea provided by the invention can be used for various multi-rack cold continuous rolling mill systems with different plate difference control capability levels, so that the cold continuous rolling mill system can be widely used for a cold rolling unit which adopts working roll shifting to control the same plate difference and is provided with a convexity meter in front of a rolling mill at present. Under the background of the continuous increase of the current global electrical steel product production line, the technology provided by the invention has broad market prospect.
Drawings
FIG. 1 is a schematic diagram of a same plate differential channeling feedforward static control system of a five-stand cold tandem mill.
Detailed Description
The invention is further described in detail below with reference to the examples, as shown in fig. 1, a convexity meter is set at the entrance of the tandem mill to detect the convexity value of the hot rolled incoming material of the strip steel in real time and upload the convexity value to a process control computer, the process control computer calculates the axial displacement position of the running roller of the working roller, accumulates the calculated value with the set value of the running roller L2, and outputs the accumulated value to L1 for the running roller setting of the working roller of the 1# 3 stand; the basic automation system is abbreviated as L1 and the process control system is abbreviated as L2.
Taking a five-frame cold continuous rolling mill, the thickness center point of the hot rolled incoming material is set to be 2614 mu m, the thickness of the cold rolled outlet is set to be 500 mu m, the requirement of the same plate difference of the outlet, namely the position 15mm away from the edge is 5 mu m, and the convexity of the head of the historical incoming material of the specification is 18 mu m.
When the welding seam reaches the front convexity meter of the frame, firstly, the convexity detection values of hot rolled incoming materials at the section positions of the strip steels i, i+1 and i+2 are read, the thickness measurement values (HC) of the center points of the strip steels fed back by the convexity meter are 2646 mu m, 2652 mu m and 2650 mu m respectively, and the thickness measurement values (H15) of the positions 15mm away from the edge are 2623 mu m, 2630 mu m and 2625 mu m respectively. The roll shifting compensation setting of the working roll of the 1# -3# frame is calculated as follows:
(1) Calculation of convexity value of current strip steel feeding head
C sum ＝(2646-2623)+(2652-2630)+(2650-2625)
C sum ＝70μm
C avg ＝23.3μm
(2) Head convexity deviation calculation
ΔC＝23.3-18＝5.3μm
(3) Work roll shifting compensation value calculation
ΔWr cal ＝5.3/(-1.2)-3＝-7.4mm
(4) Roll shifting compensation value determination for working rolls of all frames
ΔIr 1 ＝-7.4*1.0＝-7.4mm
ΔIr 2 ＝-7.4*0.6＝-4.4mm
ΔIr 3 ＝-7.4*0.2＝-1.5mm
(5) Outlet edge drop verification
E dr ＝-0.7*0.85*(-7.4)-1＝3.4μm
Through verification, 0 < E dr And less than 5, the roll shifting compensation value of the working roll is effective and is output to L1 to perform roll shifting setting of the working roll of the 1# 3 frame.
The foregoing is merely illustrative of the present invention, and simple modifications and equivalents may be made thereto by those skilled in the art without departing from the spirit and scope of the present invention.

Claims (1)

1. A feed-forward static control method for a same-plate-difference channeling roller is used for a five-rack cold continuous rolling mill and is characterized in that: a convexity meter is arranged at the inlet of the rolling mill set and used for detecting the convexity value of hot rolled incoming strip steel; when the welding seam reaches the convexity meter, the convexity meter feeds back the actual measurement value of the convexity of the head of the incoming material to the process control computer of the unit, calculates the convexity deviation of the head of the strip steel according to the convexity history information of the head of the strip steel of the specification, determines the roll-shifting compensation value of the working rolls of each frame 1# to 3# and conditionally outputs the roll-shifting compensation value, and specifically comprises the following steps:
step one, calculating the convexity value of the head of the current strip steel incoming material:
C avg ＝C sum formula II/n
Wherein C is sum Collecting the sum of periodic convexities for each convexity; c (C) avg The average value of convexities of the head of the strip steel incoming material; k is a convexity acquisition period; h ck The intermediate thickness measurement value of the strip steel in the period k is measured; h 15k The thickness measurement value is 15mm from the edge of the strip steel in the period k;
step two, calculating the convexity deviation of the head of the strip steel:
ΔC＝C avg -C prev formula III
Wherein, delta C is the convexity deviation value of the strip steel; c (C) prev Is a historical reference value of convexity of the head of the strip steel with the same specification;
step three, calculating a roll shifting compensation value of the working roll:
ΔWr cal ＝ΔC/K coWr +K com equation four
Wherein DeltaWr cal A roll shifting compensation value for the working roll; k (K) coWr The roll shifting efficiency coefficient is the working roll shifting efficiency coefficient; k (K) com Weighting coefficients for the rolls;
step four, determining roll shifting compensation values of the working rolls of the frames:
ΔIr i ＝ΔWr cal *K cori formula five
Wherein K is cori Assigning coefficients to the i racks;
fifthly, checking the outlet edge drop and conditionally outputting roll shifting compensation values delta Ir of the working rolls of the frames i ：
E dr ＝K FbWr *K Fbr *ΔW r cal+K Fbuc Formula six
Wherein E is dr A predicted value for the drop change of the outlet of the frame; k (K) FbWr The roll edge drop influence coefficient is the roll bending coefficient of the working roll; k (K) Fbr The roll shape influence coefficient is the working roll; k (K) Fbuc Is a compensation coefficient;
when E is dr When the amplitude limit of the edge drop change is smaller than that of the amplitude limit, the roll shifting compensation value delta Ir of each rack working roll is output i 。
CN202210111593.3A 2022-01-29 2022-01-29 Same-plate-difference channeling roll feedforward static control method Active CN114505353B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3831712B2 (en) * 1995-12-26 2006-10-11 Ｊｆｅスチール株式会社 Control method of continuous rolling mill
JP4337437B2 (en) * 2003-07-14 2009-09-30 Ｊｆｅスチール株式会社 Rolled material shape control method
JP3902585B2 (en) * 2003-10-17 2007-04-11 新日本製鐵株式会社 Sheet shape control method in cold rolling
JP4784320B2 (en) * 2006-01-26 2011-10-05 Ｊｆｅスチール株式会社 Method and apparatus for detecting and controlling edge drop in cold rolling
CN101618402B (en) * 2008-06-30 2011-04-13 宝山钢铁股份有限公司 Method for controlling planeness of cold-rolling strip steel
CN101683659B (en) * 2008-09-28 2012-05-30 宝山钢铁股份有限公司 Integrated control method of cold-rolling strip steel flatness and lateral thickness difference
CN103302105B (en) * 2013-06-17 2015-11-18 北京首钢股份有限公司 The cooperative control method of a kind of cold-strip steel edge crease defect and edge thickness
CN103464469B (en) * 2013-09-06 2015-11-18 鞍钢股份有限公司 A kind of edge drop amount control method of cold rolling non-orientation silicon steel
CN105436208B (en) * 2014-08-14 2017-06-23 宝山钢铁股份有限公司 Edge drop control method in the operation of rolling
CN106975663B (en) * 2016-01-15 2018-11-06 宝山钢铁股份有限公司 Solve the problems, such as the milling train roll shifting control method of edge thickening
CN109420683B (en) * 2017-08-31 2020-05-19 宝山钢铁股份有限公司 Control method for edge drop of hot continuous rolling finish rolling strip steel
CN109226281B (en) * 2018-10-19 2020-06-30 辽宁科技大学 Silicon steel edge thinning hysteresis control method based on model-free prediction algorithm

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