CN115106379A - System and method for checking plate blank size of medium plate and automatically adjusting rolling target - Google Patents
System and method for checking plate blank size of medium plate and automatically adjusting rolling target Download PDFInfo
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- CN115106379A CN115106379A CN202110305601.3A CN202110305601A CN115106379A CN 115106379 A CN115106379 A CN 115106379A CN 202110305601 A CN202110305601 A CN 202110305601A CN 115106379 A CN115106379 A CN 115106379A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
- B21B1/463—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 metal immediately subsequent to continuous casting in a continuous process, i.e. the cast not being cut before rolling
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a system and a method for checking the size of a plate blank of a medium plate and automatically adjusting a rolling target, wherein the method comprises the following steps: the first storage unit is used for storing the personalized requirements of the user material use; the second storage unit is used for storing the requirements of the internal production process; the computer information system is used for performing basic automation control, process control, production line manufacturing execution control and production operation control; and the automatic control module is used for communicating the first storage unit and the second storage unit with a computer information system. For modern medium and heavy plate production enterprises, the invention can reduce the labor intensity of operators at the same time and fully excavate the cost reduction potential in the production and operation process.
Description
Technical Field
The invention relates to an automatic control technology of a medium plate production line, in particular to a system and a method for checking the size of a plate blank of a medium plate and automatically adjusting a rolling target.
Background
Firstly, order production, material design, hot charging and hot delivery and slab weighing in the existing medium and heavy plate product manufacturing process.
Wherein, order production: in modern medium and heavy plate production enterprises, a production organization mode based on order contract is generally adopted. The salesman signs a supply contract with the user, inputs a sales management system in the enterprise, the production organization staff arranges production plans of the steel-making, rolling and other production units according to the contract order information, the steel-making, rolling and other production units execute specific production tasks, and the produced qualified medium and heavy plate products are sent to the corresponding user.
Material design: in the production organization process, a steel-making unit continuous casting target size and a rolling unit rolling target size of a material to be produced are set according to the requirements of the size, the performance and the like of a final product of an order, and the design is called as material design. The continuous casting target size of the steel-making unit mainly refers to the width and length of a continuous casting slab, and can be divided into a plurality of width grades according to the design capability of equipment. The rolling unit rolls target dimensions including target thickness, target width, minimum length.
The simple production process of the medium plate mainly comprises steel making, continuous casting, heating and rolling.
Hot charging and hot conveying: the hot charging and hot conveying refers to that the high-temperature continuous casting slab produced in the continuous casting process is not cooled in a slab warehouse, but is directly transported to the front of a heating furnace, and when the temperature of the slab is higher than 300 ℃, the slab is loaded into the heating furnace, and the subsequent heating and rolling production is started. The advantages of hot charging and hot delivery are energy saving. In addition, some steel grades with special material structures are easy to send quality defects such as edge or corner cracks and the like after being cooled to a cold plate blank without hot charging and hot delivery, for example, die steel.
Weighing a plate blank: weighing of the slab is a size checking link of the slab before entering the heating furnace. And a weighing machine is arranged at the position of the furnace entering roller way, the weighed weight of the plate blank is compared with the target weight converted from the rolling target size, if the weight deviation is more, the material design or continuous casting production link is abnormal, the plate blank is lifted off the production line, and the subsequent manual treatment is carried out.
The abnormal weight of the slab is caused by several reasons, firstly, when the width specification of the slab is converted by a continuous casting machine in continuous casting production, the head and tail widths of the produced slab are inconsistent; continuous production is carried out by a continuous casting machine, but molten steel comes from a converter produced by the whole furnace, and a slab cast by the last molten steel of a heat at the end of continuous casting cannot reach the target length of the slab; and thirdly, material design or weighing machine abnormity.
And secondly, a multi-stage computer information system and an automatic control system related to the selling and production of the medium plate.
The production operation of the modern large-scale steel and iron united enterprise usually adopts a four-level computer information system framework, which comprises a first-level basic automation (L1), a second-level process control system (L2), a third-level production line manufacturing execution system (MES L3) and a fourth-level company production operation system (ERP L4).
In each of the aforementioned links of the order production organization, the related computer or automation system has corresponding functions including:
entering a supply contract: the sales management subsystem of L4 converts the requirements of the user's order, such as steel grade, steel plate size, material properties, delivery date, etc., into computer information.
Material design: the L4 manufacturing management subsystem reads contract information such as information-based steel type and size, and then designs reasonable process target dimensions including width and length of a continuous cast slab for a production unit and target dimensions including target thickness, target width and minimum length for a rolling unit.
And (3) production planning: after the steel-making L3 summarizes the material design information of all contracts, a steel-making production plan is arranged; and (4) after the rolled steel L3 gathers the material design information of all contracts, arranging a rolling production plan.
Production logistics: the steelmaking L3 tracks and manages the production progress of the steelmaking area; and the rolled steel L3 tracks and manages the production progress of a rolled steel area.
Hot charging and hot conveying: the slab logistics information transmission is completed by the steel making L3 and the steel rolling L3 in a relay mode, the automatic control of the conveying roller way is completed by the heating furnace area L1, and the automatic feeding process is automatically completed by the heating furnace L2 operating the heating furnace steel loading machine L1.
Weighing a plate blank: the weighing machine outputs weight information, the heating furnace L2 compares weight deviation, under the condition that the weight is normal, the automatic process of entering the furnace is started, and when the weight is abnormal, the steel rolling L3 is informed to refuse the slab to enter the furnace.
And (3) running to hoist the plate blank to be off-line: the rolled steel L3 informs the traveler of the completion of the operation.
Rolling a plate blank: the rolling mill L2 receives the rolling target size forwarded by the rolled steel L3, and performs rolling process control in cooperation with the rolling mill L1.
And thirdly, using characteristics of the user material and individual requirements of the user, as exemplified by die steel.
Through the approaches of user service and the like, different medium plate users can be known, and the use modes of the steel plate are different. For example, some plates are welded together, such as for pipeline steel users, some are cut and then spliced together, such as for ship plate users, and some are machined into smaller parts, such as for mold steel users. For medium and thick plate suppliers, due to the personalized characteristics of the user material in use, the actual requirements of the user on the medium and thick plates include universal size, performance and the like, and also have a plurality of industrial personalized requirements. Taking the die steel as an example, because the user divides the steel plate into a plurality of small blocks for processing, the user has wide requirements on the width and length of the steel plate, and the width, the length and the like of the steel plate can be within a certain range. The personalized needs of the user for the material are reflected in the contract text in some cases, and may not be reflected in the contract in some cases. Even if the personalized requirements written in the contract text are entered into the sales management system, they may not be entered into a structured entry interface and may not be converted into computerized contract information.
Fourthly, special process requirements of the steel plate in internal production are met.
Some steel grades have certain characteristic process requirements in the links of continuous casting, heating, rolling and the like due to the characteristics of materials. For example, after the die steel continuous casting slab is cooled to room temperature by natural air, edge or corner cracking defects are easily caused, and product developers stipulate that the die steel slab needs to adopt a hot charging and hot delivery process, and the slab is not allowed to be off-line. The general tapping temperature, the temperature to be kept, the cooling rate and the like in the steel production process are all stored in the process design subsystem of L4, but the special process requirements in the internal production do not enter L4, but are stored in the relevant production units in a document form and the like, and are not digitized substantially.
And fifthly, the problem exists in the slab weighing link.
In the slab weighing step, the heating furnace L2 computer compares the weighed slab weight with the target weight converted from the rolling target size, and if the weight deviation is large, the slab is taken off-line. This processing logic, from a single point of view, appears to be perfect. However, the whole production and marketing process of medium plate products still has the problem of improvement.
Take the operation process of die steel as an example. The salesman and the user make an order contract with a large width and length tolerance range, but in the material design link, the rolling target size is still given according to the conventional rule, and when the width specification of the continuous casting process slab is switched or the last slab of the last pass of continuous casting is cast, the actual weight of the slab and the target weight calculated according to the rolling target size are greatly different. For such a width-variant or last slab, the furnace L2 will automatically perform the offline process according to the rules described above. The off-line die steel plate blank is likely to crack at the corner part, and only the plate blank can be scrapped.
For the neglected user individual requirements and special internal production process requirements in the information system, the prior art solution mainly depends on manual correction. For the above problems in the slab weighing process, the production unit is provided with a document, and it is specified that when operators produce certain steel grades, slab weighing, correcting and steel loading need to be switched to manual operation, and weight correcting information is ignored.
The defects of the prior art are as follows:
aiming at the manual correction measures of the weighing link:
1) due to the reasons of labor intensity of operators, information authority and the like, more detailed manual correction rules cannot be formulated, so that the rule coverage surface for preventing the checking of the plate blank is too wide, and the reasons of errors of weighing machines, material design errors and the like can be covered. In addition, the classification of steel types is not very reliable, and taking die steel as an example, the situation that each user purchasing the die steel does not intend the length and the size of the steel plate cannot be ensured;
2) the manual operation is switched, so that the labor intensity of operators is increased;
3) the reliability of the execution of the correction measures is not high, and if the production guidance document is forgotten by negligence, quality defects can occur on the corresponding steel plate blanks after automatic line unloading;
4) the control target of the subsequent process is still not correct, the real object and the information at the judgment part of the weighing link are really inconsistent and are not transferred to the subsequent process, the rolling process still adopts the length and width targets which can not be reached, the process stability of the subsequent process is reduced, and the frequent manual operation intervention of the subsequent process is added.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a system and a method for checking the size of a plate blank of a medium plate and automatically adjusting a rolling target, aiming at reducing the labor intensity of a first-line operator and fully exploiting the cost reduction potential in the production and operation process of a modern medium plate production enterprise.
In order to achieve the purpose, the invention adopts the following technical scheme:
on one hand, the system for checking the size of the plate blank of the medium plate and automatically adjusting the rolling target comprises the following components:
the first storage unit is used for storing the personalized requirements of the user material use;
the second storage unit is used for storing the internal production process requirement;
the computer information system is used for performing basic automation control, process control, production line manufacturing execution control and production operation control;
and the automatic control module is used for communicating the first storage unit and the second storage unit with a computer information system.
Preferably, the user material uses personalized requirements, including:
steel grade, user number and contract number; and
"whether or not the variation in the actual object width is large" and "whether or not the variation in the actual object length is large" are permitted.
Preferably, the internal production process requirement includes:
steel grade and process design number; and
"whether only the hot-fill and hot-feed process is allowed".
Preferably, the computer information system has four stages including:
an L1-grade weighing machine, a heating furnace steel loading machine and a rolling mill;
an L2-grade heating furnace and rolling mill;
steel making and rolling of grade L3;
a sales management subsystem and a manufacturing management subsystem of the L4 level.
On the other hand, the method for checking the slab size of the medium plate and automatically adjusting the rolling target comprises the following steps:
the system is used for automatically identifying the continuous casting plate blank, checking the weight and adjusting and controlling the rolling target, and the computer information system is communicated to be changed adaptively.
Preferably, the continuous casting slab needs to satisfy the following requirements:
1) maximum permissible short length for the length deviation of the continuous cast slab: -10 to +10 meters;
2) maximum permissible short dimension for width deviation of the continuous casting slab: -1 to +1 meter;
3) the continuous casting plate blank only allows a hot charging and hot conveying process to be adopted, and the plate blank is not allowed to be off-line;
4) the continuous casting slab is cast when the width specification of the continuous casting machine slab is converted or the last molten steel of a heat is cast at the end of continuous casting.
Preferably, the automation function is triggered by a plurality of external events to perform different processing procedures, so as to complete the automation function together.
Preferably, the external event triggering different processing flows specifically include:
event 1: automatic triggering in a fixed period;
the processing flow of the event 1 is as follows: accessing the basic contract information of the medium plate of the L4-level sales management subsystem, and synchronizing the contract number, the user number, the contract thickness size, the contract width size, the contract length size, the contract allowable width tolerance range and the contract allowable length tolerance range information into the internal database of the automatic control module;
event 2: the salesperson enters a contract;
the processing flow of the event 2 is as follows: the salesperson inputs the steel grade, the user number, the contract number, whether the deviation of the width of the real object is allowed to be large or not and whether the deviation of the length of the real object is allowed to be large or not into the first storage unit;
event 3: after the production process design of the product research and development personnel is finished;
the processing flow of the event 3 is as follows: product research personnel input steel grades, process design numbers and the condition that whether only a hot charging and hot conveying process is allowed to be adopted into the second storage unit;
event 4: after a continuous casting machine casts a slab;
the processing flow of the event 4 is as follows: the L3-level steelmaking method comprises the steps that two identifications of ' whether to produce when the width specification of a continuous casting machine slab is converted ' and ' whether to cast the slab by molten steel at the last time of continuous casting are generated in actual production information, the slab number and the two identifications are automatically sent to an automatic control module, and the automatic control module stores the received information in an internal database;
event 5: when the production plan of the rolling line is started;
the processing flow of the event 5 is as follows: after the thick plate rolling line production plan arrangement is finished, the L3-grade steel rolling can automatically trigger a rolling line production plan starting event, the L3-grade steel rolling sends information of a plate blank number, a contract number, a user number, a steel grade, a process design number and a hot-charging and hot-delivery identification which correspond to a steel plate to be produced to the automatic control module, and the automatic control module starts a preprocessing flow of automatic checking of the plate blank weight;
event 6: after the slab weighing is finished;
the processing flow of the event 6 is as follows: after weighing of the slab is completed, the heating furnace at the L2 level receives the measured weight of the slab sent by the weighing machine at the L1 level, the heating furnace at the L2 level inquires the automatic control module firstly, whether the automatic control module takes over the weight deviation check of the slab, if so, the weight deviation check of the slab is taken over, the slab weight deviation rule is used for judging whether the loading into the heating furnace is allowed, if not, the weight deviation check of the slab is not taken over, and the heating furnace at the L2 level continues to execute the original slab check process.
Preferably, in the event 5 processing flow, the preprocessing flow specifically includes:
for the steel plate to be produced, whether hot charging and hot feeding are needed or not is obtained from the information sent by the L3-grade steel rolling in the event 5;
for the steel plate to be produced, the steel grade, the user number and the contract number are used as indexes, and whether the deviation of the width of the real object is allowed to be large or not and whether the deviation of the length of the real object is allowed to be large or not are obtained from the first storage unit;
for the steel plate to be produced, the steel grade and the process design number are used as indexes, and whether the hot charging and hot conveying process is allowed to be adopted or not is obtained from the second storage unit;
for the steel plate to be produced, the slab number is used as an index, and whether the steel plate is produced when the width specification of the slab of the continuous casting machine is converted or not and whether the steel plate is the last molten steel casting slab of the last furnace of continuous casting or not are obtained from an internal database of the automatic control module;
and if and only if the 'whether the deviation of the width of the real object is allowed is yes, the' whether the deviation of the length of the real object is allowed is yes, the 'whether only the hot charging and hot delivery process is allowed' is yes, and at least one of the 'whether the steel plate is produced when the width specification of the plate blank of the continuous casting machine is converted' or 'whether the steel plate is the last molten steel cast plate blank at the end of continuous casting' is yes, obtaining a preprocessing conclusion that the steel plate to be produced conforms to the specific characteristic of automatic weight check, and finally storing the identifier of the plate blank number and the 'whether the steel plate conforms to the specific characteristic of automatic weight check' into an internal database of the automatic control module.
Preferably, in the processing flow of event 6, the L2 furnace first queries the automatic control module for query messages including slab number, measured slab weight, and rolling size target.
Preferably, in the event 6, a slab weight deviation rule is used to determine whether loading into the heating furnace is permitted, if yes, the heating furnace of level L2 is responded, a weight deviation check of the slab is taken over, the entry into the furnace is permitted as a result of the weight deviation check, and if a new rolling target width and a new rolling minimum length are given by the slab weight deviation rule, the rolling mill of level L2 is simultaneously notified, so that the rolling target size of the steel plate to be produced is changed to the new rolling target width and the new rolling minimum length; after the L2-grade heating furnace receives the response result of taking over the weight check of the slab and the check is that the slab is allowed to enter the furnace, the original slab check process is not executed, and the L1-grade heating furnace steel loading machine is directly and automatically operated to start the automatic steel loading process; after receiving the notification of the change of the rolling target, the rolling mill of the L2 level updates the rolling target information stored in the rolling mill, and when the rolling is started, the rolling mill of the L1 level and the rolling mill of the L2 level perform the rolling process according to the new target size information;
if not, responding the heating furnace of the L2 level, taking over the weight deviation check of the plate blank, and the weight deviation check result is that the plate blank is not allowed to enter the furnace, after the heating furnace of the L2 level receives the response result that the weight check of the plate blank is taken over and the check result is not allowed to enter the furnace, the original plate blank check flow is not executed, the weight exception processing is directly started, and the plate blank is rejected to enter the furnace through the steel rolling of the L3 level.
Preferably, in the processing flow of event 6, the weight deviation checking of the slab specifically includes the following steps:
1) calculating the minimum weight Wmin allowed by the contract:
wmin ═ rolling target thickness × (minimum width of contractually allowable tolerance +. DELTA.b 0) × (minimum length of contractually allowable tolerance +. DELTA.L 0);
in the above formula, the value of delta b0 is between 0 and 0.5m, and the value of delta L0 is between 0 and 1.0 m;
2) checking whether the measured weight of the plate blank is less than or equal to Wmin;
if so, responding that the charging result of the L2-grade heating furnace is 'charging impossible', finishing the weight deviation check of the plate blank, and not executing the subsequent steps;
if not, responding that the charging result of the L2-grade heating furnace is 'charging allowed', and executing the subsequent steps;
3) calculating the weight of the slab of the material design Wdgn:
wdgn is the rolling target thickness x rolling target width x rolling minimum length x density of the steel;
4) comparing the slab measured weight to Wdgn, the same decision logic as for the L2 rated furnace is performed:
if the judgment result is that the rolling target size is passed, the rolling target size does not need to be adjusted, the weight deviation checking of the plate blank is finished, and the subsequent steps are not executed;
if the judgment result is that the rolling target size does not pass, adjusting the rolling target size, and entering the step 5);
5) adjusting the calculation process of rolling target size, determining the two items to be quantified by adopting a common nonlinear optimization algorithm, wherein the quantities to be quantified are width change quantity delta b and length change quantity delta L;
optimized objective function:
in the above formula, W meas Is the measured weight of the slab, b tgt Is the existing rolling target width;
calculating a new rolling target width b new And a new minimum rolled length L new ：
7) The calculated new rolling target width b new And a new minimum rolled length L new And sending the data to the L2 rolling mill as a specific data item for changing the rolling target size.
Preferably, in the step 4), the judgment logic is as follows:
whether the measured weight/Wdgn of the plate blank is between 0.9 and 1.1 or not is judged to pass if the measured weight/Wdgn of the plate blank is between 0.9 and 1.1, and otherwise, the measured weight/Wdgn of the plate blank is not passed.
Preferably, in the formula (1) of step 5), the calculation formula of W is as follows:
W＝h×(b tgt +△b 0 +△b)×(L tgt +△L 0 +. DELTA L) × ρ equation (3);
in the above formula, h is the rolling target thickness, L tgt Is the minimum length of the existing mill, and ρ is the density of the steel.
The system and the method for checking the size of the plate blank of the medium plate and automatically adjusting the rolling target provided by the invention are characterized in that existing information is integrated in a cross-process and cross-level manner by means of a data platform interconnected with computer systems at all levels, and information such as individual requirements for using key original non-digitalized user materials, special process requirements for internal production and the like is digitally processed, so that the automatic checking of the refined weight of the plate blank is finally realized, the size target of a subsequent rolling process is automatically and correspondingly adjusted, the labor intensity of operators is reduced, and the cost reduction potential of the production and operation process is fully excavated.
Drawings
FIG. 1 is a schematic diagram of a system for checking the dimension of a slab of a medium plate and automatically adjusting a rolling target according to the present invention;
FIG. 2 is a schematic diagram of a preprocessing flow of the processing flow of event 5 in the method for checking the slab size of the medium plate and automatically adjusting the rolling target according to the present invention;
FIG. 3 is a schematic diagram of the process flow of event 6 in the method for checking the slab size and automatically adjusting the rolling target of the medium plate according to the present invention;
fig. 4 is a schematic diagram of the slab weight deviation check of the processing flow of event 6 in the method for checking the slab size of the medium plate and automatically adjusting the rolling target according to the present invention.
Detailed Description
In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.
Referring to fig. 1, the system for checking the slab size of a medium plate and automatically adjusting a rolling target according to the present invention includes:
a first storage unit 101 for storing the personalized requirements for the use of the user materials;
a second storage unit 102 for storing the internal production process requirements;
a computer information system 200 for performing basic automation control, process control, production line manufacturing execution control and production operation control;
the automatic control module 103 is used for communicating the first storage unit 101 and the second storage unit 102 with the computer information system 200.
A corresponding control module software interface framework 100 is also designed, and the control module software interface framework 100 realizes the automatic functions of identification, weight check, rolling target adjustment control and the like aiming at the continuous casting plate blank with specific characteristics, and communicates with the computer information system 200 to be adaptively changed.
The first storage unit 101 stores the personalized requirements of the use of the user materials, and only two characteristic data need to be stored except for the index conditions such as steel grade, user number, contract number and the like: "whether or not the deviation of the actual object width is permitted is large" and "whether or not the deviation of the actual object length is permitted is large", and when the salesperson enters the contract, the contract is input to the first storage unit 101.
The second storage unit 102 stores internal production process requirements, and only one feature data needs to be stored except for index conditions such as steel grade, process design number and the like: "whether only the hot-fill and hot-feed process is allowed" is input into the second storage unit 102 by a developer after the product process is designed.
The computer information system 200 has four levels, specifically including:
an L1-grade weighing machine 201, a heating furnace steel loading machine 202 and a rolling mill 203;
an L2-grade heating furnace 204, rolling mill 205;
l3-grade steel making 206 and steel rolling 207;
a sales management subsystem 208 and a manufacturing management subsystem 209 of the L4 level.
The continuous cast slab with the specific characteristics mainly comprises the following specific characteristics:
1) based on the individual material use requirement of a user, the method has a large allowable range for the length deviation of the continuous casting slab material object (maximum allowable short length: -10 to +10 meters);
2) based on the individual material use requirement of a user, the width deviation of the continuous casting slab object has a large allowable range (maximum allowable short length: -1 to +1 meter);
3) a hot charging and hot conveying process is adopted;
4) based on the special requirements of the internal production process, the continuous cast slab only allows the hot charging and hot conveying process to be adopted, and does not run off line;
5) the continuous casting slab is a slab cast by the last molten steel of a furnace at the end of continuous casting or during width specification conversion of the slab of a continuous casting machine.
The invention also provides a method for checking the size of the plate blank of the medium plate and automatically adjusting the rolling target, which comprises the following steps:
the system of the invention is used for carrying out automatic functions of identification, weight check, rolling target adjustment control and the like on the continuous casting slabs, and is communicated with the computer information system 200 to be adaptively changed.
The automation function is triggered by a plurality of external events to carry out different processing flows together to complete the automation function.
The specific external events and corresponding processing flows are as follows:
event 1: automatic triggering is carried out in a fixed period;
event 1 processing flow: the basic information of the medium plate contract of the sales management subsystem 208 of the L4 level is accessed, and the information of the contract number, the user number, the contract thickness size, the contract width size, the contract length size, the contract allowable width tolerance range, the contract allowable length tolerance range and the like is synchronized into the internal database of the automatic control module 103.
Event 2: the salesperson enters a contract;
event 2 processing flow: the salesperson inputs two characteristic data of steel grade, user number, contract number and user material use individualized requirement, namely whether the deviation of the width of the real object is allowed to be large and whether the deviation of the length of the real object is allowed to be large, into the first storage unit 101.
Event 3: after the production process design of the product research and development personnel is finished;
event 3 processing flow: the product developer enters a characteristic data "whether only the hot-fill and hot-feed process is allowed" of the steel grade, the process design number, and the internal production process requirement into the second storage unit 102.
Event 4: after a continuous casting machine casts a slab;
event 4 processing flow: according to actual production information, the L3-level steel making 206 generates two identifiers of whether to produce the slab in the width specification conversion of the continuous casting machine slab and whether to cast the slab in the last molten steel casting time of the last continuous casting, automatically sends the slab number and the two identifiers to the automatic control module 103, and the automatic control module 103 stores the received information in an internal database.
Event 5: when the production plan of the rolling line is started;
event 5 processing flow: after the production plan arrangement of the thick plate rolling line is finished, the L3-grade steel rolling 207 can automatically trigger the production plan starting event of the rolling line, the L3-grade steel rolling 207 sends information such as a plate blank number, a contract number, a user number, a steel grade, a process design number, a hot-charging and hot-delivery identification and the like corresponding to a steel plate to be produced to the automatic control module 103, and the automatic control module 103 starts a preprocessing flow of automatic checking of the plate blank weight;
referring to fig. 2, the preprocessing flow for the automatic control module 103 to start the automatic checking of the slab weight is as follows:
for the steel plate to be produced, "hot-fill hot-feed" is obtained from the information sent at event 5 from the L3-grade rolled steel 207;
for the steel plate to be produced, steel type, user number and contract number are used as indexes, and whether the deviation of the width of the real object is allowed to be large or not and whether the deviation of the length of the real object is allowed to be large or not are obtained from the first storage unit 101;
for the steel plate to be produced, the steel grade and the process design number are used as indexes, and whether the hot charging and hot conveying process is allowed to be adopted or not is obtained from the second storage unit 102;
for the steel plate to be produced, the slab number is used as an index, and whether the steel plate is produced when the width specification of the slab of the continuous casting machine is converted or not and whether the steel plate is the last molten steel cast slab of the last furnace time of continuous casting or not are obtained from an internal database of the automatic control module 103;
if and only if the two identifiers of ' whether the deviation of the real object width is allowed to be large ', ' whether the deviation of the real object length is allowed to be large ' yes, ' whether only a hot charging and hot delivery process is allowed ' yes, ' whether hot charging and hot delivery are allowed ' yes, and at least one of ' whether the steel plate to be produced is produced when the width specification of the continuous casting machine plate blank is converted ' or ' whether the steel plate blank is cast by the last molten steel at the end of continuous casting, the preprocessing conclusion is obtained, the steel plate to be produced accords with the specific characteristic of automatic weight check, and finally, the identifier of the plate blank number ' whether the steel plate blank accords with the specific characteristic of automatic weight check ' is stored in an internal database of the automatic control module 103.
Event 6: after the slab weighing is finished;
referring to fig. 3, the processing flow of event 6 is as follows: after weighing of the slab is completed, the heating furnace 204 at the level of L2 receives the measured weight of the slab sent by the weighing machine 201 at the level of L1, and the heating furnace 204 at the level of L2 does not directly judge the weight deviation of the slab according to the original flow, but firstly inquires the automatic control module 103 whether the automatic control module 103 takes over the weight deviation check of the slab, and inquires the message including information such as the slab number, the measured weight of the slab, the rolling size target and the like.
After receiving the query of the L2-level heating furnace 204, the automatic control module 103 checks the internal database with the slab number as an index, and if the "whether the specific characteristic of the automatic weight check is met" is obtained, the automatic control module responds to the L2-level heating furnace 204 without taking over the weight deviation check of the slab. After the L2-level heating furnace 204 receives the response result of not taking over, the original slab checking process is continuously executed.
After receiving the query of the L2-class heating furnace 204, the automatic control module 103 searches the internal database with the slab number as an index, and if yes, first determines whether the loading into the heating furnace is permitted by using a new slab weight deviation rule.
If the new slab weight deviation rule determines that the loading into the heating furnace can be permitted, the heating furnace 204 of level L2 is responded, the weight deviation of the slab is taken over for checking, the weight deviation checking result is permission of loading into the furnace, if the new slab weight deviation rule gives a new rolling target width and a rolling minimum length, the rolling mill 205 of level L2 is informed at the same time, and the rolling target size of the steel plate to be produced is changed into the new rolling target width and the rolling minimum length. After receiving the response result of taking over the weight check of the slab and checking the weight of the slab as the allowable entry, the heating furnace 204 at the L2 level does not execute the original slab check process, and directly and automatically operates the heating furnace steel loading machine 202 at the L1 level to start the automatic steel loading process. After receiving the notification of the change of the rolling target, the heating furnace 204 of the L2-level updates the rolling target information stored therein, and when the rolling is started, the rolling mill 203 of the L1-level and the rolling mill 205 of the L2-level perform the rolling process according to the new target size information.
And if the new slab weight deviation rule judges that the loading into the heating furnace cannot be permitted, responding the L2-level heating furnace 204, taking over the weight deviation check of the slab, wherein the weight deviation check result is that the loading into the furnace is not permitted, and after receiving the response result that the weight check of the slab is taken over and the check result is that the loading into the furnace is not permitted, the L2-level heating furnace 204 does not execute the original slab check process, directly starts weight exception processing, and rejects the slab to be loaded into the furnace through the L3-level steel rolling 207.
Referring to fig. 4, the new weight deviation checking method for slabs includes the following steps:
1) calculating the minimum weight Wmin allowed by the contract:
wmin — rolling target thickness × (minimum width under contract allowed tolerance +. DELTA.b 0) × (minimum length under contract allowed tolerance +. DELTA.L 0);
in the above formula, the value of delta b0 is between 0 and 0.5m, and the value of delta L0 is between 0 and 1.0m, and is determined according to the control capability of the production process of the rolling line;
2) checking whether the measured weight of the plate blank is less than or equal to Wmin;
if yes, the fact that the charging result of the L2-grade heating furnace 204 is 'charging impossible' is answered, the weight deviation checking of the plate blank is finished, and the subsequent steps are not executed;
if not, the furnace entering result of the heating furnace 204 of the L2 grade is answered to be 'available for furnace entering', and the subsequent steps are executed;
3) calculating the weight of the slab of the material design Wdgn:
wdgn is the rolling target thickness x rolling target width x rolling minimum length x density of the steel;
4) the slab measured weight and Wdgn were compared, and the same decision logic as for the L2 furnace was performed:
if the judgment result is that the rolling target size is passed, the rolling target size does not need to be adjusted, the weight deviation checking of the plate blank is finished, and the subsequent steps are not executed;
if the judgment result is that the rolling target size does not pass, adjusting the rolling target size, and entering the step 5);
the judgment logic is as follows:
(the measured weight of the plate blank/Wdgn) is between 0.9 and 1.1, if so, the plate blank is judged to pass, and if not, the plate blank is judged not to pass;
5) adjusting the calculation process of rolling target size, determining the two to-be-quantified items to be width variation delta b and length variation delta L by adopting a common nonlinear optimization algorithm;
optimized objective function:
in the above formula, W meas Is the measured weight of the slab, b tgt Is the existing rolling target width;
the setting of the objective function takes into account two factors: the new target size is matched with the measured weight, and the rolling minimum length in the rolling size target is preferentially adjusted. In the above formula, the calculation formula of W is as follows:
W＝h×(b tgt +△b 0 +△b)×(L tgt +△L 0 + DELTAL). times.rho equation (3);
in the above formula, h is the rolling target thickness, L tgt Is the existing minimum rolled length, ρ is the density of the steel.
The optimization algorithm gives out the width change quantity delta b and the length change quantity delta L after the optimization calculation, and calculates a new rolling target width b new And a new minimum rolled length L new ：
7) The calculated new rolling target width b new And a new minimum rolled length L new Sent to the rolling mill 205 of the L2 stage as a concrete data item for the rolling target size change.
In summary, the prior art mainly adopts methods of manual management and human intervention. The invention adopts a full-automatic mode, integrates the existing information in a cross-process and cross-level manner by depending on a data platform interconnected with each level of computer system, and digitalizes the information such as the use individual requirements of key original non-digitalized user materials, the special process requirements of internal production and the like, finally realizes the automatic check of the refined weight of the plate blank, and automatically and correspondingly adjusts the size target of the subsequent rolling process, thereby reducing the labor intensity of operators and fully exploiting the cost reduction potential in the production and operation process.
Examples
The existing salesperson receives a contract for selling the die steel, inputs the contract into the sales management subsystem 208 of the L4 level, establishes the first storage unit 101, and sets the conditions of 'whether the deviation of the width of the real object is allowed to be large' and 'whether the deviation of the length of the real object is allowed to be large'.
Product developers have entered the steel grade of the die steel, the process design number, "only allowed for the hot-fill and hot-feed process" into the second storage unit 102.
The automatic control module 103 synchronizes the basic information of the medium plate contract of the sales management subsystem 208 of the L4 level at regular time every day, and synchronizes the information of the contract number, the user number, the contractual thickness dimension, the contractual width dimension, the contractual length dimension, the contractual allowable width tolerance range, the contractual allowable length tolerance range and the like of the die steel sales contract into the internal database of the automatic control module 103.
After the sales contract starts to perform production in an enterprise, and after a continuous casting machine finishes slab casting of a corresponding steel grade, the L3-level steel making 206 generates an identifier of 'whether to produce during slab width specification conversion of the continuous casting machine' and an identifier of whether to cast a slab in the last molten steel casting time of the last continuous casting according to actual production information, automatically sends the slab number and the corresponding identifier of each steel plate to the automatic control module 103, and the automatic control module 103 stores the received information in an internal database thereof. In this example, the slab number is 099, and "whether it is the final molten steel cast slab of the last heat of continuous casting" is yes.
When a slab with the slab number of 099 is transported to a slab rolling workshop by a hot charging and hot delivery process, the L3-level rolled steel 207 starts the arrangement of a slab rolling line production plan, the L3-level rolled steel 207 automatically triggers a rolling line production plan starting event, and the L3-level rolled steel 207 sends information, such as the slab number 099, a contract number, a user number, a steel type, a process design number, a hot charging and hot delivery identifier, corresponding to a steel plate to be produced to the automatic control module 103. The automatic control module 103 starts a preprocessing flow of automatic checking of the slab weight.
The pretreatment process comprises the following steps:
for the steel plate to be produced, the steel type, the user number and the contract number are used as indexes, and the first storage unit 101 obtains the conditions of 'whether the deviation of the real object width is allowed to be large' and 'whether the deviation of the real object length is allowed to be large';
for the steel plate to be produced, the steel grade and the process design number are used as indexes, and the condition that whether only the hot charging and hot conveying process is allowed to be adopted is obtained from the first storage unit 102 as yes;
for the steel plate to be produced, the slab number is used as an index, and whether the steel plate is produced when the width specification of the slab of the continuous casting machine is converted or not is obtained from an internal database of the automatic control module 103, and whether the steel plate is the final molten steel casting slab of the last furnace of continuous casting or not is obtained;
for the steel plate to be produced, the information sent in event 5 from the L3-grade rolled steel 207 is that "hot-charging and hot-feeding is yes;
in conclusion, the preprocessing conclusion is obtained, the steel plate to be produced meets the specific characteristics of automatic weight check, and the slab number 099 and the identifier of the specific characteristics of automatic weight check are stored in the internal database of the automatic control module 103.
After the slab with the slab number of 099 is transported to a medium plate workshop, the slab is directly transported to a roller way in front of a heating furnace for weighing by a weighing machine due to the adoption of a hot charging and hot conveying process, after the weighing is completed, the heating furnace 204 at the L2 level receives 13 tons of measured weight of the slab sent by the weighing machine 201 at the L1 level, the heating furnace 204 at the L2 level firstly inquires the automatic control module 103 whether the automatic control module 103 takes over the weight deviation check of the slab, and the inquiry text contains information such as the slab number of 099, the measured weight of 13 tons of the slab, the rolling size target and the like.
After receiving the query of the L2-class heating furnace 204 as to whether the slab weight deviation check is to be taken over by the newly designed automatic control module, the automatic control module 103 queries the internal database of the automatic control module 103 with the slab number 099 as an index, and if yes, determines whether the loading into the heating furnace is permitted by using the new slab weight deviation check rule.
The new plate blank weight deviation checking rule judgment process is as follows:
1) calculating the minimum weight Wmin allowed by the contract:
wmin — rolling target thickness × (minimum width under contract allowed tolerance +. DELTA.b 0) × (minimum length under contract allowed tolerance +. DELTA.L 0);
selecting Δ b0 as 0 and Δ L0 as 0, and calculating Wmin as 11 tons;
2) the measured weight of the obtained plate blank is 13 tons and more than 11 tons in Wmin;
responding that the charging result of the heating furnace 204 of the L2 level is 'charging possible', and continuing to execute the subsequent steps;
3) calculating the weight Wdgn of the plate blank of the material design:
wdgn ═ rolling target thickness × rolling target width × rolling minimum length × density of steel;
calculating to obtain Wdgn which is 15 tons;
4) comparing the measured slab weight to Wdgn, performing the same decision logic as the L2 class furnace 204;
the logic for determining the L2 stage heating furnace 204 is: if the (slab measured weight/Wdgn) is between 0.9 and 1.1, the judgment is passed, otherwise, the judgment is not passed. At this time (slab measured weight/Wdgn) ═ 0.867 < 0.9, it was judged as failed;
5) starting a calculation process for adjusting the rolling target because the judgment result of comparing the measured weight of the plate blank with the Wdgn is that the measured weight of the plate blank does not pass the Wdgn;
6) the calculation procedure for adjusting the rolling target is as follows: determining the two items of quantity to be quantified by adopting a common nonlinear optimization algorithm, wherein the quantity to be quantified is width change quantity delta b and length change quantity delta L;
the optimized objective function is:
current target width b of rolling tgt When the target thickness h is 3.0m, the target thickness h is 0.02m, and the target minimum length is 20m, the optimization objectives used are:
W＝0.02×(3.0+△b)×(20.0+△L)×ρ；
in the above formula, ρ is the density of steel.
The optimization algorithm gives the width change quantity delta b of 0.0m and the length change quantity delta L of-2.67 m after optimization calculation, and calculates a new rolling target width b new 3.0m and new minimum rolling length L new ＝17.33m。
Because the new slab weight deviation checking rule judges that the slab can be charged, the weight deviation checking of the slab is taken over in response to the heating furnace 204 of the L2 level, and the weight deviation checking result is that the charging is allowed.
Since the new slab weight deviation checking rule gives the new rolling target width, rolling minimum length, the rolling mill 205 of level L2 is informed, and the rolling target size of the steel sheet to be produced is changed to the new rolling target width of 3.0m, rolling minimum length of 17.33 m.
After receiving the response result of taking over the weight check of the slab and checking the weight of the slab as the allowable entry, the heating furnace 204 at the L2 level does not execute the original slab check process, and directly and automatically operates the heating furnace steel loading machine at the L1 level to start the automatic steel loading process.
After receiving the notification of the change of the rolling target size, the rolling mill 205 at the L2 level updates the rolling target information stored therein, and when the rolling starts, the rolling mills 203 at the L1 level and 205 at the L2 level perform the rolling process according to the new target size information.
The invention has wide application range and convenient use, is suitable for medium plate production enterprises, fully utilizes the existing equipment and information system, and furthest excavates and reduces the potential of process cost by depending on a workshop-level data platform of a factory under the era background of intelligent upgrading and reconstruction of the factory. The technology can be completely popularized and used, and has wide technical popularization prospect.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (14)
1. A system for checking the size of a plate blank of a medium plate and automatically adjusting a rolling target is characterized by comprising the following components:
the first storage unit is used for storing the personalized requirements of the user material use;
the second storage unit is used for storing the internal production process requirement;
the computer information system is used for performing basic automation control, process control, production line manufacturing execution control and production operation control;
and the automatic control module is used for communicating the first storage unit and the second storage unit with the computer information system.
2. The system for slab dimension verification and rolling target automatic adjustment of medium plate according to claim 1, wherein the user material usage individualization requirements include:
steel grade, user number and contract number; and
"whether or not the variation in the actual object width is large" and "whether or not the variation in the actual object length is large" are permitted.
3. The system for slab dimension verification and rolling target automatic adjustment of medium plate according to claim 1, wherein the internal production process requirements include:
steel grade and process design number; and
"whether only hot-fill and hot-feed processes are allowed".
4. The system for slab dimension verification and rolling target automatic adjustment of medium plate according to claim 1, wherein said computer information system has four stages comprising:
an L1-grade weighing machine, a heating furnace steel loading machine and a rolling mill;
an L2-grade heating furnace and rolling mill;
steel making and rolling of grade L3;
a sales management subsystem and a manufacturing management subsystem of the L4 level.
5. A method for checking the size of a plate blank of a medium plate and automatically adjusting a rolling target is characterized by comprising the following steps of:
automatic functions for identification, weight check, rolling target adjustment control of continuous cast slabs with the system according to any of claims 1 to 4, the communication with the computer information system requiring adaptation.
6. The method for checking the slab size and automatically adjusting the rolling target of a medium plate according to claim 5, wherein the continuously cast slab is required to satisfy the following requirements:
1) maximum permissible short length for the length deviation of the continuous cast slab: -10 to +10 meters;
2) maximum permissible short dimension for width deviation of the continuous casting slab: -1 to +1 meter;
3) the continuous casting plate blank only allows a hot charging and hot conveying process to be adopted, and the plate blank is not allowed to be off-line;
4) the continuous casting slab is cast when the width specification of the continuous casting machine slab is converted or the last molten steel of a heat is cast at the end of continuous casting.
7. The method for checking the slab size of a medium plate and automatically adjusting a rolling target according to claim 5, wherein: the automation function is triggered by a plurality of external events to carry out different processing flows, and the automation function is completed together.
8. The method for slab dimension verification and rolling target automatic adjustment of a medium plate according to claim 7, wherein the external event triggering different processing flows specifically comprises:
event 1: automatic triggering is carried out in a fixed period;
the processing flow of the event 1 is as follows: accessing the basic contract information of the medium plate of the L4-level sales management subsystem, and synchronizing the contract number, the user number, the contract thickness size, the contract width size, the contract length size, the contract allowable width tolerance range and the contract allowable length tolerance range information into the internal database of the automatic control module;
event 2: the salesperson enters a contract;
the processing flow of the event 2 is as follows: the salesperson inputs the steel grade, the user number, the contract number, whether the deviation of the width of the real object is allowed to be large or not and whether the deviation of the length of the real object is allowed to be large or not into the first storage unit;
event 3: after the production process design of the product research and development personnel is finished;
the processing flow of the event 3 is as follows: product research personnel input steel grade, process design number and whether only a hot charging and hot conveying process is allowed to be adopted into the second storage unit;
event 4: after a continuous casting machine casts a slab;
the processing flow of the event 4 is as follows: the L3-level steelmaking method comprises the steps that two identifications of ' whether to produce when the width specification of a continuous casting machine slab is converted ' and ' whether to cast the slab by molten steel at the last time of continuous casting are generated in actual production information, the slab number and the two identifications are automatically sent to an automatic control module, and the automatic control module stores the received information in an internal database;
event 5: when the production plan of the rolling line is started;
the processing flow of the event 5 is as follows: after the production plan arrangement of the thick plate rolling line is finished, the L3-grade steel rolling can automatically trigger the production plan starting event of the rolling line, the L3-grade steel rolling sends the information of the slab number, the contract number, the user number, the steel grade, the process design number and the 'hot-charging and hot-delivery' identifier corresponding to the steel plate to be produced to the automatic control module, and the automatic control module starts the pretreatment flow of the automatic check of the slab weight;
event 6: after the slab weighing is finished;
the processing flow of the event 6 is as follows: after weighing of the slab is completed, the heating furnace at the L2 level receives the measured weight of the slab sent by the weighing machine at the L1 level, the heating furnace at the L2 level inquires the automatic control module firstly, whether the automatic control module takes over the weight deviation check of the slab, if so, the weight deviation check of the slab is taken over, the slab weight deviation rule is used for judging whether the loading into the heating furnace is allowed, if not, the weight deviation check of the slab is not taken over, and the heating furnace at the L2 level continues to execute the original slab check process.
9. The method for slab dimension verification and rolling target automatic adjustment of a medium plate according to claim 8, wherein in the processing flow of event 5, the preprocessing flow is specifically as follows:
for the steel plate to be produced, whether hot charging and hot feeding are needed or not is obtained from the information sent by the L3-grade steel rolling in the event 5;
for the steel plate to be produced, the steel grade, the user number and the contract number are used as indexes, and whether the deviation of the width of the real object is allowed to be large or not and whether the deviation of the length of the real object is allowed to be large or not are obtained from the first storage unit;
for the steel plate to be produced, the steel grade and the process design number are used as indexes, and whether the hot charging and hot conveying process is allowed to be adopted or not is obtained from the second storage unit;
for the steel plate to be produced, the slab number is used as an index, and whether the steel plate is produced when the width specification of the slab of the continuous casting machine is converted or not and whether the steel plate is the last molten steel cast slab of the last furnace time of continuous casting or not are obtained from an internal database of the automatic control module;
if and only if the ' whether the deviation of the real object width is allowed is large ', the ' whether the deviation of the real object length is allowed is yes, the ' whether the hot charging and hot delivery process is allowed only ' is yes, and at least one of two identifiers, namely ' whether the production is carried out during the slab width specification conversion of the continuous casting machine ' or ' whether the production is carried out during the last molten steel casting slab of the last furnace of continuous casting ', is yes, a preprocessing conclusion is obtained, the steel plate to be produced meets the specific characteristic of automatic weight checking, and finally the identifier, namely the slab number and the ' whether the identifier meets the specific characteristic of automatic weight checking ', is stored in an internal database of the automatic control module.
10. The method for checking slab size and automatically adjusting rolling target of medium plate according to claim 8, wherein: in the processing flow of event 6, the L2 furnace first queries the query message of the automatic control module to include the slab number, the measured slab weight, and the rolling size target.
11. The method for checking slab size and automatically adjusting rolling target of medium plate according to claim 8, wherein: in the processing flow of the event 6, a slab weight deviation rule is used for judging whether loading into the heating furnace is permitted, if yes, the heating furnace of the L2 level is responded, the slab weight deviation check is taken over, the weight deviation check result is permission of loading into the furnace, if the slab weight deviation rule gives a new rolling target width and a new rolling minimum length, the rolling mill of the L2 level is informed at the same time, and the rolling target size of the steel plate to be produced is changed into the new rolling target width and the new rolling minimum length; after the L2-grade heating furnace receives the response result of taking over the weight check of the slab and the check is that the slab is allowed to enter the furnace, the original slab check process is not executed, and the L1-grade heating furnace steel loading machine is directly and automatically operated to start the automatic steel loading process; after receiving the notification of the change of the rolling target, the rolling mill of the L2 level updates the rolling target information stored in the rolling mill, and when the rolling is started, the rolling mill of the L1 level and the rolling mill of the L2 level perform the rolling process according to the new target size information;
if not, responding the heating furnace of the L2 level, taking over the weight deviation check of the plate blank, and the weight deviation check result is that the plate blank is not allowed to enter the furnace, after the heating furnace of the L2 level receives the response result that the weight check of the plate blank is taken over and the check result is not allowed to enter the furnace, the original plate blank check flow is not executed, the weight exception processing is directly started, and the plate blank is rejected to enter the furnace through the steel rolling of the L3 level.
12. The method for slab dimension verification and rolling target automatic adjustment of a medium plate according to claim 11, wherein in the event 6 processing flow, the concrete steps of slab weight deviation verification are as follows:
1) calculating the minimum weight Wmin allowed by the contract:
wmin ═ rolling target thickness × (minimum width of contractually allowable tolerance +. DELTA.b 0) × (minimum length of contractually allowable tolerance +. DELTA.L 0);
in the formula, the value of delta b0 is between 0 and 0.5m, and the value of delta L0 is between 0 and 1.0 m;
2) checking whether the measured weight of the plate blank is less than or equal to Wmin;
if yes, answering that the charging result of the L2-grade heating furnace is 'charging impossible', finishing the weight deviation checking of the plate blank, and not executing the subsequent steps;
if not, responding that the charging result of the L2-grade heating furnace is 'charging allowed', and executing the subsequent steps;
3) calculating the weight of the slab of the material design Wdgn:
wdgn ═ rolling target thickness × rolling target width × rolling minimum length × density of steel;
4) comparing the slab measured weight to Wdgn, the same decision logic as for the L2 rated furnace is performed:
if the judgment result is that the rolling target size is passed, the rolling target size does not need to be adjusted, the weight deviation checking of the plate blank is finished, and the subsequent steps are not executed;
if the judgment result is that the rolling target size does not pass, adjusting the rolling target size, and entering the step 5);
5) adjusting the calculation process of rolling target size, determining the two items to be quantified by adopting a common nonlinear optimization algorithm, wherein the quantities to be quantified are width change quantity delta b and length change quantity delta L;
optimized objective function:
in the above formula, W meas Is the measured weight of the slab, b tgt Is the existing rolling target width;
calculating a new rolling target width b new And a new minimum rolled length L new ：
7) The new rolling target width b is calculated new And a new minimum rolled length L new And sending the data to the L2 rolling mill as a specific data item for changing the rolling target size.
13. The method for checking slab size and automatically adjusting rolling target of medium plate according to claim 12, wherein in the step 4), the judgment logic is as follows:
(the measured weight of the plate blank/Wdgn) is between 0.9 and 1.1, if so, the plate blank passes, otherwise, the plate blank does not pass.
14. The method for checking slab size and automatically adjusting rolling target of medium plate according to claim 12, wherein in the formula (1) of the step 5), the calculation formula of W is as follows:
W＝h×(b tgt +△b 0 +△b)×(L tgt +△L 0 + DELTAL). times.rho equation (3);
in the above formula, h is the rolling target thickness, L tgt Is the existing minimum rolled length, ρ is the density of the steel.
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