CN110434172B - Load distribution calculation method for continuous rolling of furnace coil and finishing mill group - Google Patents
Load distribution calculation method for continuous rolling of furnace coil and finishing mill group Download PDFInfo
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- CN110434172B CN110434172B CN201910642025.4A CN201910642025A CN110434172B CN 110434172 B CN110434172 B CN 110434172B CN 201910642025 A CN201910642025 A CN 201910642025A CN 110434172 B CN110434172 B CN 110434172B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
- B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
- B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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Abstract
The invention provides a load distribution calculation method for continuous rolling of a furnace coil and a finishing mill group, and belongs to the technical field of steel rolling. The method comprises the steps of firstly, grading the steel species, the thickness and the width of a finished product of a production outline of a furnace coil rolling line, and determining the setting of a process table; then, the steckel mill and the finishing mill group are taken as a whole to carry out load distribution calculation and optimization, two calculation methods are set, and automatic selection is carried out according to the production steel type; after the coil pass and the load distribution calculation of the finishing mill group are completed, calculating the rolling force and the rolling moment of the rolling mill, checking the capability of the rolling mill, and completing the load distribution calculation if the checking is successful; if the rolling passes fail, optimizing the furnace rolling passes and the load of the finishing mill group; and if the load redistribution optimization fails, performing furnace coil increase pass correction calculation, and returning to the step two to perform load redistribution again. The method is simple and practical, and effectively improves the production stability and increases the production yield of the rolling line on the premise of ensuring the safety of equipment.
Description
Technical Field
The invention relates to the technical field of steel rolling, in particular to a load distribution calculation method for continuous rolling of a furnace coil and a finishing mill group.
Background
The invention aims at a steckel mill production line which adopts a 1+1+3 arrangement type, and the main equipment comprises 1 stepping heating furnace, 1 high-pressure water rough descaling machine, 1 four-roller reversing rough mill with auxiliary vertical rollers, 1 flying shear, 1 high-pressure water fine descaling machine, 2 recoiling furnaces (1 for each inlet and outlet side of the steckel mill), 1 four-roller reversing steckel mill, 3 four-roller non-reversing finishing mills, 1 set of laminar cooling devices and 1 underground recoiling machine.
The finishing area of the steckel mill mainly comprises 1 steckel mill and 3 finishing mills, wherein the steckel mill is a four-roller reversing mill, and a coiling furnace and a pinch roll are respectively arranged at the front and the rear of the mill. The temperature in the coiling furnace is controlled by a computer, the temperature range is 950-1150 ℃ according to different production varieties and processes, and the requirement of the heat-insulating intermediate blank is met; the finishing mill is a four-roller irreversible mill, and a hydraulic loop is arranged between the steckel mill and the finishing mill. The intermediate strip first passes under the coiler furnace on the entry side of the steckel mill, where it is rolled in a first pass. After the head of the strip blank is discharged from the rolling mill, the strip blank is sent into a coiling furnace by a pinch roll on the outlet side for coiling, and a coiling block of the coiling furnace is synchronous with the rolling mill; when the strip is reversibly rolled, the pinch roll on the entry side sends the strip to the coiler furnace on the entry side to be coiled, and likewise the coiler drum of the entry coiler furnace is synchronized with the rolling mill. And (3) rolling the strip blank in the steckel mill for 1-5 passes, then conveying the strip blank to a finishing mill group, wherein the last pass of the steckel mill forms a continuous rolling relationship with the finishing mill group F1/F2/F3, and finally rolling the strip blank to the thickness of a finished product.
The main steel types of the product outline of the steckel mill production line are ordinary steel, alloy steel, stainless steel and other series, different steel types have different requirements on load distribution and production states of a finish rolling area (a steckel and a finish rolling unit), and different load distribution calculation methods are required.
The load distribution of the conventional hot continuous rolling (1+6/1+7/1+8 and the like) finishing mill group adopts the modes of an energy consumption distribution method, a relative reduction ratio, a rolling force proportion and the like, and a lot of research results are obtained. For example, patent 201710958271.1 proposes a novel load distribution method for hot continuous rolling of strip, which utilizes a hybrid particle swarm optimization algorithm to obtain a rolling force distribution coefficient and takes rolling energy consumption and strip shape control requirements into account. Patent 201610729966.8 proposes a load distribution method for improving rolling stability of a hot-rolled thin strip by optimizing the rolling force ratio of a thin gauge strip mill F3-F6 to improve the rolling stability of the thin gauge strip. Patent 201610370594.4 proposes a method for setting load distribution of finish rolling strip steel, which obtains the rolling reduction of each stand by iterative calculation of rolling force distribution mode, and solves the problem of large rolling force ratio fluctuation of each stand when the rolling condition changes in the rolling force distribution mode. Patent 201410338147.1 proposes a hot rolling load distribution method by product classification, which divides hot rolling into cold rolled material and steel of different grades, and adopts different load distribution modes. Patent 201811587492.3 proposes a method for calculating load distribution of a finishing hot continuous rolling mill set, which converts a standard load distribution value into a rolling force load distribution value, and improves the accuracy of rolling force distribution calculation and the strip steel threading stability. Patent 201810612729.2 proposes a load distribution method for a rolling mill for producing non-oriented silicon steel, which improves the shape of strip steel and prolongs the rolling period by reducing the load of a rear-stage frame during the production of non-oriented silicon steel. The literature (model and control of hot strip rolling, publisher of the metallurgical industry, 2002) describes energy consumption distribution of load distribution in finishing mill groups. The methods proposed by these documents can solve the load distribution problem of the conventional hot continuous rolling finishing mill group, and do not relate to the load distribution problem of the steckel mill.
The load distribution calculation method for the steckel mill conventionally adopts a mode of fixing pass times and relative reduction ratios, and for example, a method for setting a model rule of a four-roller reversible steckel mill according to the fixed pass times and different passes according to load distribution ratios of three modes of reduction, rolling force and rolling power is introduced in documents (research on a steckel mill rolling rule setting model, Master thesis of Wuhan science and technology university, 20080330). The literature (Ann steckel mill high-precision process control model application research, steel rolling automation, 2018,35(6)) introduces the main model situation of the Anyang 3450mm steckel mill process control system.
The method proposed by the above document can solve the calculation methods of load distribution of a conventional hot continuous rolling finishing mill group and load distribution of a single stand of a steckel mill, and does not relate to a load calculation method of continuous rolling of a steckel and a finishing mill group. The invention provides a load distribution calculation method for continuous rolling of a furnace coil and a finishing mill set, which considers different process characteristics of stainless steel, plain carbon steel and other alloy steel, adopts different load distribution calculation modes, gives consideration to production stability, gives full play to the maximum capacity of a rolling mill and improves the production yield of a production line.
Disclosure of Invention
The invention aims to provide a load distribution calculation method for continuous rolling of a furnace coil and a finishing mill group.
The steckel mill usually consists of equipment such as a heating furnace, a reversing mill, a coiler and the like, is suitable for rolling medium and heavy plates and producing stainless steel, alloy steel and the like, and usually has the defects of poor surface quality, incapability of producing thin specifications and the like. At present, a 1+1+3 steckel mill production line with both steckel and continuous rolling characteristics mainly comprises 1 four-roller reversible roughing mill with auxiliary vertical rollers, 2 recoiling furnaces (1 for each inlet and outlet side of the steckel mill), 1 four-roller reversible steckel mill, 3 four-roller irreversible finishing mills, 1 set of laminar cooling device, 1 underground recoiling mill and other devices. The novel furnace coil continuous rolling production line can produce high-quality thin strip steel when producing carbon steel, stainless steel and alloy steel. However, different steel types have different process requirements, for example, the production of carbon steel is mainly pursued for yield, and the production of stainless steel is required to ensure production stability and surface quality. Therefore, a load distribution calculation method with flexible control is needed, and the production requirements and the process characteristics of different steel grades are considered.
The invention relates to a novel steckel mill production line based on a 1+1+3 type. The steel type is mainly produced into hot rolled steel coils of 200 series stainless steel, 300 series stainless steel, 400 series stainless steel, plain carbon steel and low alloy steel. The thickness of the plate blank is 220mm, the target thickness of the finished product is 2.0-16.0 mm, and the thickness of the intermediate blank is 24-40 mm.
The method comprises the following steps:
(1) the production outline of the double-furnace coil rolling line is graded into N according to steel gradesCThe grade is N according to the thickness of the finished productHThe step is N according to the width of the finished productBShifting; establishing a process parameter table of a finish rolling area, wherein the process parameter table is set to be NmShifting;
(2) calculating the actual thickness of the rough rolling outlet according to the actually measured data of the rough rolling outlet, and taking the actual thickness as the thickness of a rolling inlet of the furnace; acquiring the actual width, the length and the temperature of a rough rolling intermediate blank;
(3) according to the steel grade produced by the raw materials in the rolling plan, a coil load distribution calculation mode is automatically selected, and the distribution mode can be intervened on an HMI (human machine interface);
(4) the furnace volume load distribution calculation mode is divided into two modes, wherein the first mode is as follows: fixing the number of times of the furnace winding pass, the reduction rate of the furnace winding pass and the reduction rate of the finishing mill group, and calculating the reduction distribution of the furnace winding pass and the finishing mill group according to the thickness of a furnace winding-in port and the target thickness of a finished product;
the second load distribution calculation mode is as follows: fixing the thickness of the coil outlet and the reduction rate of the finishing mill group, automatically calculating the pass number and pass load distribution of the coil pass according to the maximum capacity of the coil mill, calculating the pass reduction distribution of the coil according to the thickness of the coil outlet and the thickness of the coil outlet, and calculating the reduction distribution of the finishing mill group according to the target thickness of the coil outlet and the target thickness of a finished product;
(5) after the outlet thicknesses of the furnace coil and the finish rolling are obtained, operating a temperature forecasting model, a rolling force forecasting model and a rolling power model, calculating the furnace coil, the finish rolling force and the rolling power, checking the capacity of the rolling mill, and finishing the load distribution calculation process after the checking is successful;
(6) after the capability checking of the rolling mill fails, optimizing the loads of the coil pass and the finishing mill group, returning the optimization principle to the step (4) for re-load distribution according to the priority principle of the maximum pass or the maximum frame margin capability, and repeatedly optimizing the process for n times;
when calculating the maximum margin capacity of a coil pass or a finishing mill frame, the following rules are adopted:
a) the capacity of the first pass or the machine frame is out of limit and is distributed to other passes or machine frames according to the equal proportion principle;
b) the last pass or the machine frame is overrun, and the overrun value is increased to other passes or machine frames with small loads;
c) and (4) the capacity of the rest of the passes or the racks is out of limit, and the other passes or the racks are distributed to other passes or the racks according to the equal proportion principle.
(7) After the load redistribution optimization fails (the number of times of the redistribution optimization exceeds n times), if a first load distribution calculation mode is adopted, the system gives an alarm and prompts, and quits the load distribution calculation process; and (4) if the second load distribution calculation mode is adopted, performing furnace roll increase pass (+2) correction calculation, returning to the step (4) to perform load distribution calculation again, and if the number of the furnace roll passes reaches the maximum pass number, giving an alarm by the system and quitting the load distribution calculation process.
Wherein, in the step (1), all steel types produced by the coil rolling line are divided into three series of stainless steel, plain carbon steel and alloy steel according to the product outline, NCIs set to 20, NHIs 15, NBIs 5;
the process parameter table of the finish rolling area comprises the target thickness of a rough rolling outlet, the load distribution mode of the finish rolling area, the times of a furnace coil passage, the target thickness of a furnace coil outlet, the furnace coil reduction rate, the reduction rate of a finish rolling unit, Nm＝NC×NB×NH。
Specifically, in the finishing area process parameter table:
1) rough rolling outlet target thickness: is set to NmThe step is used as the calculation basis of the rough rolling schedule;
2) load distribution mode of a finish rolling area: comprises the following modes ofMode two, set to NCShifting;
3) the number of furnace winding passes: for mode one, set to NmShifting;
4) coil outlet target thickness: for mode two, set to NmGear
5) Coil reduction rate: setting the default value of the reduction rate of each pass of the furnace coil to be NmShifting;
6) reduction of finishing mill group: the default value of the reduction rate of the finishing mill frame is set as NmAnd (4) shifting.
Comparing the actual thickness of the rough rolling outlet with the target thickness in the step (2), if the actual thickness exceeds the target thickness, adopting the rough rolling target thickness as the inlet thickness of the steckel mill, and adopting the calculation formula as follows:
H0＝Gappowder-(FSPowder+RDPowder+OFPowder+WRTCPowder+WRWCPowder+WRSCPowder+ZPPowder)
In the formula, H0Is the thickness of the rough rolling outlet in mm; gapPowder: roughly rolling the last time and actually measuring the roll gap value, mm; FS (file system)PowderThe final rough rolling bounce is mm; RDPowderThe influence quantity of the deformation of the roller system is mm; OFPowderIs the influence quantity of the oil film thickness, mm; WRTCPowderThe influence quantity of the hot roll shape is mm; WRWCPowderThe influence quantity of the roller abrasion is mm; WRSCPowderThe roll shifting influence quantity is mm; ZPPowderZero-adjustment position, mm.
When the steel type produced by the raw materials in the step (3) is stainless steel and alloy steel, the production stability of the stainless steel and the alloy steel is kept as much as possible in the production, the furnace coil pass distribution and the load of a finishing mill set are solidified after being optimized, and the stability of the process parameters and the model setting is kept, so that a first load distribution calculation mode is adopted; when the steel grade produced by the raw materials is plain carbon steel, the plain carbon steel pursues the production yield as much as possible in the production, exerts the maximum capacity of the rolling mill, finishes the rolling in as little time as possible, and defaults to adopt a load distribution calculation mode II.
The first load distribution calculation mode in the step (4) is specifically as follows: after the number of furnace coil passes and the reduction rate of the furnace coil passes are determined, after the reduction rate of a finish rolling rack is determined, load distribution calculation is carried out on each pass of the furnace coil and a finish rolling unit as a whole according to the thickness of a furnace coil inlet and the thickness of a finish rolling finished product outlet, and iterative calculation is carried out to obtain the real reduction rate, inlet and outlet thickness values of each pass of the furnace coil and each finish rolling rack; the calculation formula of the modification coefficient a is calculated by the iteration of the reduction ratio in the iteration process is as follows:
in the formula: h is3Is the target thickness of the outlet of the F3 frame, namely the target thickness of the product, mm; h is3 *Calculating the thickness, i.e. the value after the last iteration, mm, for the F3 gantry exit; r is the relative rolling reduction of the pass or the frame,
wherein H is the inlet thickness and H is the outlet thickness.
The second load distribution calculation mode in the step (4) is specifically as follows: and automatically calculating the pass number and pass load distribution of the coil pass according to the maximum capacity of the coil mill, calculating coil pass reduction distribution according to the thickness of a coil inlet and the thickness of a coil outlet, calculating the reduction distribution of a finishing mill group according to the target thickness of the coil outlet and the target thickness of a finished product, and setting the default coil pass number as the minimum coil pass number as 1.
The rolling mill capability checking item in the step (5) comprises the following steps: the rolling reduction, the biting angle, the rolling force and the rolling power are all limited to be smaller than the maximum capacity value of the rolling mill. The method specifically comprises the following steps:
a) rolling mill reduction rate checking: according to the process condition limitation of a production line:
b) checking a bite angle of the rolling mill: according to the process condition limitation of a production line and a steel grade;
c) checking the maximum rolling force of the rolling mill: according to the maximum capacity limit of the equipment;
d) limiting the maximum motor power of the rolling mill: according to the maximum capability limit of the device.
In the step (6), n is less than or equal to 10.
In the step (7), in the second load distribution calculation mode, if the capability parameter check of the finishing mill group fails and the redistribution optimization times are out of limit, optimizing the target thickness of the coil outlet, and returning to the step (4) to perform the load distribution calculation process again;
when the number of furnace winding passes is calculated, the maximum number of furnace winding passes is 5.
The technical scheme of the invention has the following beneficial effects:
in the scheme, the method is suitable for a 1+1+3(n) steckel mill production line, different load distribution calculation methods are adopted when stainless steel, plain carbon steel and alloy steel are adopted, and the production stability and the mill yield are both considered. The on-line test and the engineering application are carried out on a production line of a certain domestic steckel mill, and practices show that the load calculation method is convenient and flexible to use for the production line which combines stainless steel and carbon steel, can meet different requirements, is simple to operate and easy to realize, and is suitable for being used by control systems of all similar production lines.
Drawings
FIG. 1 is a flow chart of a load distribution calculation method of a continuous rolling load distribution calculation method of a coil and a finishing mill group according to the present invention;
FIG. 2 is a second calculation flow chart of the load distribution calculation method of the continuous rolling of the coil and finishing mill group of the invention;
fig. 3 is a control general flow chart of the load distribution calculation method for continuous rolling of the coil and the finishing mill group of the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a load distribution calculation method for continuous rolling of a furnace coil and a finishing mill group.
As shown in fig. 3, the method comprises the steps of:
(1) the production outline of the double-furnace coil rolling line is graded into N according to steel gradesCThe grade is N according to the thickness of the finished productHThe step is N according to the width of the finished productBShifting; establishing a process parameter table and a process table of a finish rolling areaIs set to NmShifting;
(2) calculating the actual thickness of the rough rolling outlet according to the actually measured data of the rough rolling outlet, and taking the actual thickness as the thickness of a rolling inlet of the furnace; acquiring the actual width, the length and the temperature of a rough rolling intermediate blank;
(3) according to the steel grade produced by the raw materials in the rolling plan, a coil load distribution calculation mode is automatically selected, and the distribution mode can be intervened on an HMI (human machine interface);
(4) the furnace volume load distribution calculation method is divided into two types, wherein, as shown in fig. 1, the first load distribution calculation method is as follows: fixing the number of times of the furnace winding pass, the reduction rate of the furnace winding pass and the reduction rate of the finishing mill group, and calculating the reduction distribution of the furnace winding pass and the finishing mill group according to the thickness of a furnace winding-in port and the target thickness of a finished product;
as shown in fig. 2, the second load distribution calculation method is: fixing the thickness of the coil outlet and the reduction rate of the finishing mill group, automatically calculating the pass number and pass load distribution of the coil pass according to the maximum capacity of the coil mill, calculating the pass reduction distribution of the coil according to the thickness of the coil outlet and the thickness of the coil outlet, and calculating the reduction distribution of the finishing mill group according to the target thickness of the coil outlet and the target thickness of a finished product;
(5) after the outlet thicknesses of the furnace coil and the finish rolling are obtained, operating a temperature forecasting model, a rolling force forecasting model and a rolling power model, calculating the furnace coil, the finish rolling force and the rolling power, checking the capacity of the rolling mill, and finishing the load distribution calculation process after the checking is successful;
(6) after the capability checking of the rolling mill fails, optimizing the loads of the coil pass and the finishing mill group, returning the optimization principle to the step (4) for re-load distribution according to the priority principle of the maximum pass or the maximum frame margin capability, and repeatedly optimizing the process for n times;
(7) after the optimization of load redistribution fails, if a first load distribution calculation mode is adopted, the system gives an alarm and prompts, and quits the load distribution calculation process; and (4) if the second load distribution calculation mode is adopted, performing furnace roll increase pass correction calculation, returning to the step (4) to perform load distribution calculation again, and if the number of furnace rolls reaches the maximum pass number, giving an alarm by the system and quitting the process of load distribution calculation.
The following description is given with reference to specific examples.
The method is applied to a certain furnace coil hot rolling production line, and 1+1+3 machine type configuration is adopted.
1) The slab specification of the steckel mill production line is as follows: the thickness of the plate blank is 220mm, the width of the plate blank is 900-1600 mm, the target thickness of a finished product is 2.0-16.0 mm, and the thickness of the intermediate blank is 24-40 mm. The production steel comprises the following steps: 200 series stainless steel (201), 300 series stainless steel (304, 316), 400 series stainless steel (410S, 430), carbon structural steel (Q235), low alloy steel (Q345), and small steel grades (304L, 316L, 2205).
2) Dividing the steel grade of the product outline into Nc 20 grades, respectively replacing the steel grade with material codes P01-P20, and dividing the width into NBThe thickness is divided into N in 5 gradesH15 grades, the model process surface layer is respectively divided into NmGear NmThe calculation method comprises the following steps: n is a radical ofm＝NC×NB×NH20 × 5 × 15 × 1500. According to the grading ranges in the material, width and thickness grading tables in the table 1, the target values of the incoming material slab and the finished product in the rolling plan are subjected to calculation of the grading serial number of the process table.
TABLE 1 materials width and thickness grading table
| Grading number | Material code Ci | Represents steel grade | Thickness grading h (mm) | Width grading Bi(mm) |
| 1 | P01 | 201 | h＜2.1 | B＜1100 |
| 2 | P02 | 2.1≤h＜2.5 | 1100≤B＜1200 | |
| 3 | P03 | 2.5≤h＜2.8 | 1200≤B＜1300 | |
| 4 | P04 | 304 304L | 2.8≤h＜3.0 | 1300≤B＜1400 |
| 5 | P05 | 316 316L | 3.0≤h＜3.3 | 1400≤B＜1600 |
| 6 | P06 | 3.3≤H＜3.5 | ||
| 7 | P07 | 410S | 3.5≤H＜4.0 | |
| 8 | P08 | 430 | 4.0≤H＜4.5 | |
| 9 | P09 | 2205 | 4.5≤H＜5.1 | |
| 10 | P10 | 5.1≤H＜5.5 | ||
| 11 | P11 | Q235 | 5.5≤H＜6.0 | |
| 12 | P12 | Q345 | 6.0≤H＜8.0 | |
| 13 | P13 | 8.0≤H＜10.6 | ||
| 14 | P14 | 10.6≤H≤13.2 | ||
| 15 | P15 | 13.2≤H＜16.0 | ||
| 16 | P16 | |||
| 17 | P17 | |||
| 18 | P18 | |||
| 19 | P19 | |||
| 20 | P20 |
3) The maximum rolling force of the steckel mill is 4500Ton, the maximum power of a motor is 2 x 7000KW, the pass reduction rate is 50% at most, and the maximum biting angle is 20 degrees; the maximum rolling force of the finish rolling mill is 4000Ton, the maximum power of a motor is 7000KW, the rolling reduction rate of the mill is 50% at most, and the maximum biting angle is 20 degrees.
Example one
Selecting 304 steel types, the thickness of the plate blank is 220mm, and the width of the plate blank1270mm, the target thickness of the finished product is 6.0mm, and the thickness of the intermediate blank is 38 mm. According to the grading ranges in the material, width and thickness grading tables in table 1, the sequence numbers in the computer memory start from 0, the steel material code is P04, the width grading number 3 and the thickness grading number 12, and the corresponding sequence numbers in the computer memory are respectively: ci＝3，Bi＝2，HiCalculating the model process surface number as 11:
Nm＝Ci×NB×NH+Bi×NH+Hi＝3×5×15+2×15+11＝266
the finishing process table is looked up from the layer 266 serial number as follows:
finish rolling load distribution manner setting table: selecting a first load distribution mode;
furnace coil number of passes schedule: the number of furnace rolling passes is defaulted to 3;
furnace rolling pass reduction table: the values are 33, 30, respectively;
reduction gauge of finishing mill group: the values are 25, 21, 14, respectively;
the procedure calculation process of the furnace coil in the finish rolling area comprises the following steps: through the measured values of the last rough rolling pass, the thickness of the intermediate billet is calculated to be 39.26mm (in a hot state), the measured width of the intermediate billet is 1287.81mm (in the hot state), the length of the intermediate billet is 59.78m (in the hot state), and the temperature of the intermediate billet is 1015 ℃.
According to the calculation flow shown in fig. 1, the coil and finish rolling load distribution results are shown in table 2, and then the rolling temperature, the rolling force, the rolling power, and the like of each pass of the coil and each stand of the finish rolling are calculated according to the temperature prediction model and the rolling force prediction model;
table 2304 example table for calculation of procedure
And comparing the rolling schedule calculation result with the maximum capacity of the rolling mill, checking that the reduction rate, the biting angle, the rolling force and the rolling power of each pass of the furnace coil and each finish rolling rack pass all, and successfully calculating the load distribution.
Example two
The steel grade Q235 is selected, the thickness of the plate blank is 220mm, the width of the plate blank is 1380mm, the target thickness of a finished product is 3.0mm, and the thickness of an intermediate blank is 28 mm. According to the grading ranges in the material, width and thickness grading tables in table 1, the sequence numbers in the computer memory start from 0, the steel material code is P11, the width grading number 3 and the thickness grading number 5, and the corresponding sequence numbers in the computer memory are respectively: ci＝10，Bi＝2，HiCalculating the model process surface layer number as 4:
Nm＝Ci×NB×NH+Bi×NH+Hi＝10×5×15+2×15+4＝784
the finish rolling process table is searched from the layer 784 serial number as follows:
a finishing load distribution mode setting table: selecting a second load distribution mode;
chart of number of passes of furnace volume: the number of furnace rolling passes is defaulted to 1;
draw roll outlet target thickness: the value was 7.0;
v furnace rolling pass reduction table: the values are 38, 33, respectively;
draft table of finishing mill group: the values are 29, 26, 17, respectively;
the procedure calculation process of the furnace coil in the finish rolling area comprises the following steps: through the measured values of the last rough rolling pass, the thickness of the intermediate billet is calculated to be 28.36mm (in a hot state), the measured width of the intermediate billet is 1395.83mm (in the hot state), the length of the intermediate billet is 81.13m (in the hot state), and the temperature of the intermediate billet is 982 ℃.
According to the calculation flow shown in fig. 2, the coil and finish rolling load distribution results are shown in table 3, the number of coil passes of the furnace is set to 1, the rolling temperature, the rolling force and the rolling power are calculated according to the entrance thickness and the exit thickness, and the rolling force, the rolling power and the like are calculated;
table 3Q 235 procedure calculation example table (first cycle)
In table 3, the reduction rate of the pass P1 of the coil is 75.14%, the maximum reduction rate of the pass exceeds 50%, the number of times of the coil is +2, then the load distribution calculation of the coil, the operation temperature prediction and the rolling force prediction model calculation are performed again, and the calculation results are shown in table 4.
Table 4 example table for Q235 procedure calculation (final result)
And comparing the rolling schedule calculation result with the maximum capacity of the rolling mill, checking that the reduction rate, the biting angle, the rolling force and the rolling power of each pass of the furnace coil and each finish rolling rack pass all, and successfully calculating the load distribution.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A load distribution calculation method for continuous rolling of a furnace coil and a finishing mill group is characterized by comprising the following steps: the method comprises the following steps:
(1) the production outline of the double-furnace coil rolling line is graded into N according to steel gradesCThe grade is N according to the thickness of the finished productHThe step is N according to the width of the finished productBShifting; establishing a process parameter table of a finish rolling area, wherein the process parameter table is set to be NmShifting;
(2) calculating the actual thickness of the rough rolling outlet according to the actually measured data of the rough rolling outlet, and taking the actual thickness as the thickness of a rolling inlet of the furnace; acquiring the actual width, the length and the temperature of a rough rolling intermediate blank;
(3) according to the steel grade produced by the raw materials in the rolling plan, a coil load distribution calculation mode is automatically selected, and the distribution mode can be intervened on an HMI (human machine interface);
(4) the furnace volume load distribution calculation mode is divided into two modes, wherein the first mode is as follows: fixing the number of times of the furnace winding pass, the reduction rate of the furnace winding pass and the reduction rate of the finishing mill group, and calculating the reduction distribution of the furnace winding pass and the finishing mill group according to the thickness of a furnace winding-in port and the target thickness of a finished product;
the second load distribution calculation mode is as follows: fixing the thickness of the coil outlet and the reduction rate of the finishing mill group, automatically calculating the pass number and pass load distribution of the coil pass according to the maximum capacity of the coil mill, calculating the pass reduction distribution of the coil according to the thickness of the coil outlet and the thickness of the coil outlet, and calculating the reduction distribution of the finishing mill group according to the target thickness of the coil outlet and the target thickness of a finished product;
(5) after the outlet thicknesses of the furnace coil and the finish rolling are obtained, operating a temperature forecasting model, a rolling force forecasting model and a rolling power model, calculating the furnace coil, the finish rolling force and the rolling power, checking the capacity of the rolling mill, and finishing the load distribution calculation process after the checking is successful;
(6) after the capability checking of the rolling mill fails, optimizing the loads of the coil pass and the finishing mill group, returning the optimization principle to the step (4) for re-load distribution according to the priority principle of the maximum pass or the maximum frame margin capability, and repeatedly optimizing the process for n times;
(7) after the optimization of load redistribution fails, if a first load distribution calculation mode is adopted, the system gives an alarm and prompts, and quits the load distribution calculation process; and (4) if the second load distribution calculation mode is adopted, performing furnace roll increase pass correction calculation, returning to the step (4) to perform load distribution calculation again, and if the number of furnace rolls reaches the maximum pass number, giving an alarm by the system and quitting the process of load distribution calculation.
2. The load distribution calculation method for the continuous rolling of the furnace coil and the finishing mill group according to claim 1, characterized in that: the method is applied to a hot rolling strip steel production line which is configured into a production line of 1 frame of rough rolling, 1 frame of furnace coil and 3 frames of finish rolling and continuous rolling.
3. The load distribution calculation method for the continuous rolling of the furnace coil and the finishing mill group according to claim 1, characterized in that: in the step (1), all production steel types of the coil rolling line are divided into three series of stainless steel, plain carbon steel and alloy steel according to the product outline, and N isCIs set to 20, NHIs 15, NBIs 5;
the process parameter table of the finish rolling area comprises the target thickness of a rough rolling outlet, the load distribution mode of the finish rolling area, the times of a furnace coil passage, the target thickness of a furnace coil outlet, the furnace coil reduction rate, the reduction rate of a finish rolling unit, Nm＝NC×NB×NH。
4. The load distribution calculation method for the continuous rolling of the furnace coil and the finishing mill group according to claim 1, characterized in that: the actual thickness of the rough rolling outlet in the step (2)
H0＝GapPowder-(FSPowder+RDPowder+OFPowder+WRTCPowder+WRWCPowder+WRSCPowder+ZPPowder)
In the formula, H0Is the thickness of the rough rolling outlet in mm; gapPowder: roughly rolling the last time and actually measuring the roll gap value, mm; FS (file system)PowderThe final rough rolling bounce is mm; RDPowderThe influence quantity of the deformation of the roller system is mm; OFPowderIs the influence quantity of the oil film thickness, mm; WRTCPowderThe influence quantity of the hot roll shape is mm; WRWCPowderThe influence quantity of the roller abrasion is mm; WRSCPowderThe roll shifting influence quantity is mm; ZPPowderZero-adjustment position, mm.
5. The load distribution calculation method for the continuous rolling of the furnace coil and the finishing mill group according to claim 1, characterized in that: when the steel grades produced by the raw materials in the step (3) are stainless steel and alloy steel, a first load distribution calculation mode is adopted; and when the steel grade produced by the raw materials is plain carbon steel, adopting a second load distribution calculation mode.
6. The load distribution calculation method for the continuous rolling of the furnace coil and the finishing mill group according to claim 1, characterized in that: the first load distribution calculation mode in the step (4) is specifically as follows: after the number of furnace coil passes and the reduction rate of the furnace coil passes are determined, after the reduction rate of a finish rolling rack is determined, load distribution calculation is carried out on each pass of the furnace coil and a finish rolling unit as a whole according to the thickness of a furnace coil inlet and the thickness of a finish rolling finished product outlet, and iterative calculation is carried out to obtain the real reduction rate, inlet and outlet thickness values of each pass of the furnace coil and each finish rolling rack; the calculation formula of the modification coefficient a is calculated by the iteration of the reduction ratio in the iteration process is as follows:
in the formula: h is3Is the target thickness of the outlet of the F3 frame, namely the target thickness of the product, mm; h is3 *Calculating the thickness, i.e. the value after the last iteration, mm, for the F3 gantry exit; r is the relative rolling reduction of the pass or the frame,
wherein H is the inlet thickness and H is the outlet thickness.
7. The load distribution calculation method for the continuous rolling of the furnace coil and the finishing mill group according to claim 1, characterized in that: the second load distribution calculation mode in the step (4) is specifically as follows: and automatically calculating the pass number and pass load distribution of the coil pass according to the maximum capacity of the coil mill, calculating coil pass reduction distribution according to the thickness of a coil inlet and the thickness of a coil outlet, calculating the reduction distribution of a finishing mill group according to the target thickness of the coil outlet and the target thickness of a finished product, and setting the default coil pass number as the minimum coil pass number as 1.
8. The load distribution calculation method for the continuous rolling of the furnace coil and the finishing mill group according to claim 1, characterized in that: the rolling mill capability checking item in the step (5) comprises the following steps: the rolling reduction, the biting angle, the rolling force and the rolling power are all limited to be smaller than the maximum capacity value of the rolling mill.
9. The load distribution calculation method for the continuous rolling of the furnace coil and the finishing mill group according to claim 1, characterized in that: n in the step (6) is less than or equal to 10.
10. The load distribution calculation method for the continuous rolling of the furnace coil and the finishing mill group according to claim 1, characterized in that: in the step (7), in a second load distribution calculation mode, if the capability parameter verification of the finishing mill group fails and the redistribution optimization times are out of limit, optimizing the target thickness of the coil outlet, and returning to the step (4) to perform the load distribution calculation again;
when the number of furnace winding passes is calculated, the maximum number of furnace winding passes is 5.
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