WO2021027449A1 - Method and model system for plate assembling and slab designing of medium-thickness hot rolled plate in consideration of flexible non-fixed-size order specifications - Google Patents

Abstract

A method and model system for plate assembling and slab designing of a medium-thickness hot rolled plate in consideration of flexible non-fixed-size order specifications. The method comprises the following steps: obtaining production order information, performing order classification, and simplifying two-dimensional combination orders into the width-doubling design of one-dimensional combination orders; grouping orders according to a sub plate combinable rule; using a combination method with flexible non-fixed-sized order specifications being considered so as to complete the design of a mother plate of each group of orders; if the orders are two-dimensional combination orders, using a width-doubled assembled plate to supplement and complete the design of a two-dimensional mother plate; after completing the design of the mother plates of all the orders, designing a slab with a section being selectable, and outputting optimal two slab cutting solutions; and using the two slab cutting solutions for making a production plan, and by means of the production plan, controlling production operation and device operation. The method considers and uses the flexibility of the non-fixed-size order specifications and the multi-selectivity of the section of the slab to perform integrated and optimized design on the mother plate and the slab of the medium-thickness hot rolled plate, thereby improving design quality, having a high yield rate and a low waste rate, and significantly improving design effects.

Description

Method and model system for hot-rolled medium-thick plate assembly and slab design considering non-fixed-length order specification flexibility Technical field

The invention relates to the technical field of metallurgical control, in particular to a method and a model system capable of designing one-dimensional and two-dimensional, fixed-length and non-fixed-length hot-rolled medium-thick plate assemblies and slabs.

Background technique

Hot-rolled plate is widely used in infrastructure construction, defense industry, construction machinery and other industries. The wide range of industries makes the production orders for the plate product market have the characteristics of multiple varieties, multiple specifications, small batches, and individualization. This makes the contradiction between meeting the market's individual customization needs and the enterprise's large-scale production more prominent. For the production of medium and heavy plates, the first step is to design the plate assembly and slab for the production order. This is not only to establish a "bridge" between production and customer needs, but also the basis for production planning. The degree of optimization of plate assembly and slab design has become a prerequisite for enterprises to achieve large-scale low-cost production, and it is also a key element for medium and heavy plate enterprises to quickly respond to the market and improve their core competitiveness.

In recent years, relevant research on plate assembly and slab design of medium and heavy plates has been mainly carried out for the optimization of one-dimensional mother board design under a single determined slab section. The design method takes into account the flexibility of the mother board specification; the corresponding two-dimensional design Because of the complexity of the problem and the limitation of specific cutting methods, it is more difficult to model and solve the problem. Some researchers have attributed the problem of two-dimensional slab design to the problem of packing (for example, Zheng Y et al. Hybrid Scatter Search and Tabu Search for the Mother Plate Design Problem in the Iron and Steel Industry), and designed the corresponding solution algorithm according to the characteristics of the problem. However, the above research introduced many assumptions in the modeling process, and simplified the uncertainty of the board assembly and slab design process to a certain extent, making it difficult to be directly applied to actual production. In the application field of related model methods, some researchers have proposed an automatic design method for double-length order plate assembly and slab design (for example, the inventor of the present invention Zheng Zhong et al. "Research and Application of Medium and Thick Slab Blank Design System" Some iron and steel companies have explored the functional expansion of the enterprise ERP information system (such as the content disclosed in CN2011101141094), and achieved certain results, but the complete order processing capability, the global optimization capability of the model, and system functions, etc. It is also difficult to meet the actual needs of enterprises. In the ERP and MES systems of most iron and steel enterprises, the plate assembly and slab automatic design function of medium and heavy plates can usually only complete the design of a single order. For multiple orders of multiple varieties, specifications, and small batches, there is no Effective calculation method.

Summary of the invention

The present invention aims to at least solve the technical problems existing in the prior art, and particularly innovatively proposes a method and model system for the design of hot-rolled medium-thick plate assembly and slab considering the flexibility of non-fixed-length order specifications.

In order to achieve the above-mentioned object of the present invention, according to the first aspect of the present invention, the present invention provides a hot-rolled medium-thickness plate assembly and slab design method that takes into account the flexibility of non-scheduled order specifications, which specifically includes the following steps:

S1: Acquire and store motherboard information in a basic parameter database, where the motherboard information includes a length range, a width range, and a thickness range;

Obtain the production order information and store it in the order database. The production order information includes the length, width, thickness, steelmaking grade, rolling grade and delivery status of the ordered product;

Perform order preprocessing, divide the order into one-dimensional combination order and two-dimensional combination order according to the width of the order sub-board; simplify the two-dimensional combination order into a double-width design of the one-dimensional combination order according to the order sub-board combination method;

S2: Group the orders according to the combinable rules of the daughter boards;

S3, select a group of orders that have not been designed for the motherboard, and complete the motherboard design by taking into account the flexibility of non-fixed-length order specifications;

S4: Determine whether the order in step S3 is a two-dimensional combination order, if so, complete the two-dimensional motherboard design according to the double-width design principle, otherwise perform step S5;

S5: Judge whether all orders have completed the motherboard design, if not, perform step S3, if all orders have completed the motherboard design, then perform step S6;

S6: Carry out slab design, and select the optimal two-cut billet plan according to the corresponding section and output;

S7, the obtained two-cut billet plan can be output to the steelmaking and hot rolling production planning system to prepare the steelmaking and continuous casting production plan and the hot rolling unit production plan, and then control the production operation and related equipment operations through the production plan.

The hot-rolled medium-thick plate assembly and slab design method of the present invention that takes into account the flexibility of non-fixed-length order specifications considers and utilizes the uncertainty of non-fixed-length order specifications and the flexibility of slab multi-section selection to carry out medium and thick plate and The integrated and optimized design of the slab improves the design quality, with high yield rate, low residual material rate, and significantly improved design efficiency, which can shorten the planning time to seconds and minutes.

In order to achieve the above objectives of the present invention, according to the second aspect of the present invention, the present invention provides a hot-rolled medium-thick plate assembly and slab design model system that takes into account the flexibility of non-fixed-length order specifications, which includes a data layer and Application layer, the data layer includes a user order database, a basic design parameter database, a design rule parameter database, and a design result database; the application layer receives data information in the data layer, uses the user interface to obtain order information, and the application layer uses the method of the present invention Carry out the hot-rolled medium-thick plate assembly and slab design and output through the user interface, and use the obtained two-cut billet plan to prepare the steelmaking production plan; the operation result of the application layer is output to the steelmaking production planning system and the hot rolling production The planning system prepares steelmaking-continuous casting production plans and hot rolling unit production plans, and then controls production operations and related equipment operations through production plans.

The invention adopts the layered modularization idea to design the medium and thick plate assembly and slab design model system, hierarchically classifies and divides the functional modules, and focuses on solving the medium and thick plate assembly and slab design problems in one-dimensional and two-dimensional modes , Improve the efficiency of board assembly. Validation through a steel mill’s production data model system showed that the model system has significantly improved both design quality and efficiency, and can flexibly adapt to changes in conditions such as on-site process and production organization. In order to reduce material loss in the production process, Provide tools to reduce production costs.

The additional aspects and advantages of the present invention will be partly given in the following description, and part of them will become obvious from the following description, or be understood through the practice of the present invention.

Description of the drawings

The above and/or additional aspects and advantages of the present invention will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a flow chart of a design method of hot-rolled medium-thick plate assembly and slab considering non-fixed-length order specification flexibility in a preferred embodiment of the present invention;

Figure 2 is a flowchart of a motherboard design in a preferred embodiment of the present invention;

3 is a flow chart of a design method of hot-rolled medium and heavy plate assembly and slab considering flexibility of non-fixed-length order specifications in another preferred embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a hot-rolled medium-thick plate assembly and slab design model system considering the flexibility of non-fixed-length order specifications in a preferred embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the drawings are exemplary, and are only used to explain the present invention, but should not be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be mechanically connected or electrically connected, or two The internal communication of the elements may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meaning of the above terms can be understood according to specific conditions.

The plate assembly and slab design of the medium and heavy plates includes the mother plate design and the slab design. The mother plate design is the process of splitting and combining production orders into rolling mother plates and determining the size of the mother plate. From the perspective of the cutting dimension of the mother board, the production order sub-board combination includes one-dimensional and two-dimensional combinations. One-dimensional combination is only combined in the length direction, and the combination constraint also mainly considers the length direction constraint. The two-dimensional combination needs to be combined in the length and Combine the two directions of width. At the same time, because the non-fixed-length production order only gives the specification range, and the production equipment and rolling process requirements also have a certain adjustment range, therefore, the motherboard design needs to consider the uncertainty of the non-fixed-length order specifications and the specifications of the mother board. Uncertainty and the uncertainty of multi-section selection, etc., through the optimization of these uncertainties, the quality of the motherboard design can be improved and the design residual material can be reduced. After the design of the mother board is completed, the slab design stage will calculate the corresponding two-cut billet specifications of the mother board according to the selected two-cut billet section of the mother board and the specifications of the mother board slab, and obtain the two-cut billet required for the preparation of the steelmaking production plan.

The present invention provides the first hot-rolled medium-thick plate assembly and slab design method that takes into account the flexibility of non-fixed-length order specifications, as shown in Figure 1, which specifically includes the following steps:

S01, obtain motherboard information and production order information;

S02, perform order preprocessing, and group the orders;

S03, adopt the method of board assembly considering the flexibility of non-fixed-length order specifications to complete the motherboard design;

S04: Carry out slab design, select and output the optimal two-cut billet plan according to the corresponding section;

S05: Output the obtained second-cut billet plan to the steelmaking and hot rolling production planning system to prepare the steelmaking and continuous casting production plan and the hot rolling unit production plan, and then control the production operation and related equipment operations through the production plan.

In this embodiment, the motherboard information is acquired and stored in the basic parameter database, or the motherboard assembly requirement information is acquired and confirmed from the database, the motherboard information includes the length range, the width range, and the thickness range; the production order information is acquired and Stored in the order database, or obtain and confirm the production order information from the database. The production order information includes the contract number, product specification, length, width, thickness, steel grade, rolled steel grade, order quantity, remaining quantity, and remaining quantity of the ordered product. Number of pieces, method of transportation, and delivery status.

In this embodiment, the orders are grouped according to the sub-board combinable rule.

In this embodiment, during order preprocessing, the order is divided into one-dimensional combination orders and two-dimensional combination orders according to the width of the order daughter board; the two-dimensional combination order is simplified to a multiple of the one-dimensional combination order according to the order daughter board combination method Wide design.

In this embodiment, as shown in FIG. 2, step S03 specifically includes:

S031, select a group of orders that have not undergone motherboard design, and complete the motherboard design by taking into account the flexibility of non-fixed-length order specifications;

S032: Determine whether the order in step S031 is a two-dimensional combination order, if so, complete the two-dimensional motherboard design according to the double-width design principle, otherwise perform step S033;

S033: It is judged whether all the orders have completed the motherboard design, if not, step S3 is executed, and if all the orders have completed the motherboard design, step S04 is executed.

In this embodiment, the specific calculation process of step S03 and step S04 can also adopt the method described in the second preferred embodiment, which will be described in detail later.

The present invention provides a second hot-rolled medium-thick plate assembly and slab design method that takes into account the flexibility of non-fixed-length order specifications, as shown in Figure 3, which includes the following steps:

S1: Acquire and store motherboard information in a basic parameter database, where the motherboard information includes a length range, a width range, and a thickness range;

Obtain the production order information and store it in the order database. The production order information includes the contract number, product specifications, length, width, thickness, steelmaking grade, rolling grade, order quantity, remaining quantity, remaining number of pieces, transportation method and delivery of the ordered product status;

Perform order preprocessing, divide the order into one-dimensional combination order and two-dimensional combination order according to the width of the order sub-board; simplify the two-dimensional combination order into a double-width design of the one-dimensional combination order according to the order sub-board combination method.

In this embodiment, when the width of the order sub-plate is less than the lower limit of the rolling width of the hot rolling mill, it is a two-dimensional combined order, otherwise it is a one-dimensional combined order.

The method to simplify the double-width design of a two-dimensional combination order to a one-dimensional combination order is:

Set that the sum of the width of the daughter boards of all orders in the width direction does not exceed the maximum rolling width of the mother plate; the length of the mother plate of the two-dimensional combination is the sum of the length of the daughter plate with the largest length in the width direction;

If the order sub-board combination method is that two sub-boards can be combined in the width direction, and the length and width of the two sub-boards are equal, the two-dimensional assembly problem can be treated as the double-width problem of the one-dimensional assembly. The pre-processing and post-processing of dimensional combination orders realize the two-dimensional board design. The pre-processing process simplifies the two-dimensional combination order into the double-width problem of the one-dimensional combination order, and the post-processing supplements the two-dimensional design of the two-dimensional combination order.

S2: Group the orders according to the combinable rules of the sub-boards, for example, divide the orders with steel grades, rolled steel grades, width, thickness, thickness negative tolerance, and delivery status into one group.

S3, select a group of orders that have not undergone motherboard design, and complete the motherboard design by taking into account the flexibility of non-fixed-length order specifications. The specific steps include:

S31, select the design section of the mother plate according to the corresponding relationship between the mother plate specification and the slab rolling specification, calculate the length range of the mother plate, the length range of the mother plate corresponds to the slab length range, and calculate according to the slab length range and the thickness and width of the mother plate The length range of the mother board, the length of the mother board is initially uncertain, which is determined according to the daughter board combined on the mother board;

S32: Calculate the initial length of the non-fixed-length order daughter board, the number of initial orders, the initial length is the minimum length of the non-fixed-length order daughter board, for example, the length of each cycle increases by 50mm, the initial order number is calculated based on the order quantity and the initial length;

S33. Combine the order daughter boards to the motherboard according to the daughter board combination constraint conditions to obtain a feasible motherboard design plan. The constraint conditions are the order quantity constraints; about each order daughter board can only be combined on one motherboard ; Non-fixed-length order daughter board length limit constraint; mother board length limit constraint; section selection constraint, the same order chooses the same section constraint; or the constraint condition is: order quantity constraint; each order daughter board can only be combined into one Mother board; non-fixed-length order daughter board length restriction restriction; mother board minimum and maximum length restriction restriction; mother board minimum and maximum width restriction restriction; secondary cut blank minimum and maximum length restriction restriction; section selection restriction: production order product specification Constraints corresponding to the cross-section specifications, the same production order selects the same cross-section constraints.

In a preferred embodiment of the present invention, the constraint conditions are:

Constraints (11) and (12) are order quantity constraints. Constraint (13) means that each order daughter board can only be combined on one mother board. Constraint (14) is a non-fixed-length order daughter board length limit constraint. Constraint (15) )～(17) is the length limit constraint of the mother board, and the constraint (18) is the section selection constraint. If the same section is selected for the same order, the design plan of the secondary blank and the mother board that needs to be produced to meet the order can be obtained by solving the model. .

In another preferred embodiment of the present invention, the constraint conditions are:

Constraints (21) and (22) are order quantity constraints. Constraint (23) means that each order daughter board can only be combined on one motherboard. Constraint (24) is a non-fixed-length order daughter board length limit constraint. Constraint (25) )～(27) is the limit of the length of the mother board, the constraint (28) is the limit of the maximum width of the mother board, the constraint (29) is the section selection constraint, the same section is selected for the same order, and the constraint (210) is the length limit of the second cut. Constraints, by solving the model, you can get the design plan of the two-cut blank and the mother board that needs to be produced to meet the order demand.

The specific process of obtaining a feasible motherboard design scheme is:

S331: Calculate the length range of the motherboard:

Calculate the maximum rollable length of the mother plate under section k according to the conversion relationship between the mother plate and the slab

And minimum rollable length

At the same time, compare the maximum length of the motherboard to get the maximum length of the motherboard

And minimum length

Among them, p refers to the mother board, k is the slab section serial number, and j is the mother board serial number;

Is the thickness of the slab, B _k is the width of the slab, s is the burnout rate, g is the kerf value, a is the lower limit of the thickness tolerance, h is the thickness allowance, k is the width allowance, and l is the length allowance. The kerf value, thickness negative tolerance lower limit, thickness allowance, width allowance, and length allowance are taken as a function of the motherboard specifications and slab specifications;

S332: Calculate the initial length of the daughter board for non-fixed-length orders

And the number of initial orders

According to the requirements of the production order for the daughter board specifications, the daughter board specifications of the fixed-length order are fixed, and the combination is directly performed. The length of the daughter board of the non-fixed-length order is the range value

When combining daughter boards, it is necessary to use the principle of maximizing the board surface (the greater the length of the mother board, the better) and the maximum length of the mother board, and use the conversion formula of the mother board and slab to calculate the initial length of the daughter board of the non-fixed-length order

And the number of initial orders

Among them, h refers to the thickness of the motherboard;

S333: Combine the order daughter boards into a rolling mother board:

S3331, sort the order daughter boards in the order of length from largest to smallest or from smallest to largest, and calculate the parent

S3333, select a daughter board with the longest order and compare the length of the daughter board

And the remaining length of each motherboard

If there is a mother board, you can put the order daughter board into it, select the mother board with the longest length and combine the daughter board to the mother board. If not, generate a new mother board and combine the daughter board to Calculate the remaining length of all motherboards again on the motherboard

And the remaining number of orders

S3334, cyclically execute steps S3331 to S3333 until all the daughter boards are combined.

S34: Establish an objective function and calculate the remaining length of the mother board. The objective function is to minimize the amount of residual material; or the objective function includes: minimizing the amount of residual material; minimizing material loss during rolling production; and minimizing the number of mother plates.

In a preferred embodiment, the objective function is:

In another preferred embodiment, the objective function is:

Among them, i is the order number, v is the serial number of the sub-board, m is the total number of orders, and q is the total number of sections.

h is the thickness of the order daughter board,

w is the width of the order daughter board,

ρ _zg is the order product density,

l _i,v are the lengths in order i,

They are the minimum length and maximum length of the daughter board of order i, if it is a fixed-length order, there are

DHL _i is the order weight of order i,

d _i is the number of orders for order i;

Is the length of mother board j,

The maximum rolling length of the mother plate required by the rolling process,

These are the minimum and maximum rollable lengths of the mother plate corresponding to the length of the second cut under the section k, which are calculated by the mother plate slab conversion formula;

Is the width of mother board j,

Is the maximum width of the motherboard,

Is the length of the second cut blank corresponding to the mother board j,

They are the minimum and maximum lengths of two cut blanks,

a _{i, v, j} are 0-1 variables, when the daughter board v of order i is combined with the mother board j, it is 1, otherwise it is 0;

It is a 0-1 variable, it is 1 when the motherboard j is enabled, otherwise it is 0;

It is a 0-1 variable, it is 1 when order i selects section k for design, otherwise it is 0;

dou _i is a 0-1 variable, it is 1 when the order is a two-dimensional combination order, otherwise it is 0.

S35: Use the solution improvement strategy to optimize the feasible solution;

The specific steps to improve the motherboard design results using the solution improvement strategy are:

S351: Arrange the daughter board combination results obtained in S33 in descending or ascending order of the length of the mother board;

S352: Check whether all meet the minimum length of the motherboard

If all requirements are met, the mother board design is ended, and step S353 is executed; otherwise, the order specification flexibility, mother board specification flexibility and slab section are used to selectively adjust the order daughter board length, mother board length and mother board selection section , Optimize the motherboard design results; S353: output the improved motherboard design results.

S36, obtain the optimized motherboard design scheme.

In this embodiment, the method of optimizing the design results of the mother board by selectively adjusting the length of the order daughter board, the length of the mother board and the selection section of the mother board by using the flexibility of the non-fixed-length order specification, the flexibility of the mother board specification and the slab section for:

Adjust the length of the daughter board of the non-fixed ruler on the mother board, and increase the length of the daughter board of the non-fixed rule order to make the length of the mother board reach the minimum length. If not, adjust the position of the daughter board on the mother board (move the daughter board from the largest mother board) To the motherboard that does not meet the minimum length of the motherboard) and/or replace the design section, recalculate the length of the motherboard, the length of the daughter board and the number of orders for non-fixed-length orders.

S4: Determine whether the order in step S3 is a two-dimensional combination order, if it is, supplement the two-dimensional motherboard design according to the double-width design principle, otherwise perform step S5;

S5: Judge whether all orders have completed the motherboard design, if not, perform step S3, if all orders have completed the motherboard design, then perform step S6;

S6: Carry out slab design, and select and output the optimal two-cut billet plan according to the corresponding section;

In S7, the obtained two-cut billet plan can be output to the steelmaking and hot rolling production planning system to prepare the steelmaking and continuous casting production plan and the hot rolling unit production plan, and then control the production operation and related equipment operations through the production plan.

The present invention also provides a hot-rolled medium-thick plate assembly and slab design model system that takes into account the flexibility of non-fixed-length order specifications (the specific application system will be refined and adjusted according to the specific conditions of the steel plant), as shown in Figure 4. Show, which includes the data layer, application layer and user layer,

The data layer includes a user order database, a basic design parameter database, a design rule parameter database, and a design result database; the basic design parameter database stores design parameters used in the design process, and the design rule parameter database stores rule requirements in the calculation process, such as parent The maximum length of the slab, the range of the length of the slab; some are just design parameters, such as the length, width and thickness allowance.

The application layer receives the data information in the data layer and uses the user interface to obtain the order information. The user interface includes the production order management interface, the board and slab design interface, the design result management interface and the design parameter management interface. The application layer processor uses the claims The method described in 1-6 is used to design the hot-rolled medium-thick plate assembly and slab and output it through the user interface. Use the obtained two-cut billet plan to prepare the steelmaking and continuous casting production plan and the hot rolling unit production plan, and pass the production plan Control production operation and related equipment operation;

The user layer stores user information, and sets the usage rights of different users according to production management requirements.

In order to verify the effectiveness of the method and the practicability of the model system, a production order received by a steel mill was used to test the plate assembly and slab design method and the performance of the model system. Four groups were designed according to the different order acceptance cycles. In the test, each group contains 3 test cases, which is convenient for the comparative test of different order grouping numbers and non-fixed-length order ratios. The test results are shown in Table 1.

Table 1. Comparison of model system board design results under different planning cycles

Among them: proportion of non-fixed-length orders = number of non-fixed-length orders/total number of orders; finished product rate = finished product weight/slab weight; residual material rate = residual material weight / mother board weight.

The test data in Table 1 shows that the plate assembly and slab design method and model system are correct and effective, and can quickly complete the assembly design of all production orders. The specific instructions are as follows:

Comparing the yield rate and residual material rate of the three production orders in each set of test cases in Table 1, it can be seen that as the number of order groups decreases and the proportion of non-fixed-length orders to the total number of orders increases, the yield rate increases significantly , The residual material rate is significantly reduced. It can be seen that, on the one hand, the present invention can try all possible combinations of order sub-boards, on the other hand, it can make full use of the flexibility of non-fixed-length order sub-board specifications. With the increase in the size of the order pool and the increase in the proportion of non-fixed-size orders Therefore, the present invention can effectively improve the design yield rate of the board assembly and the slab, and reduce the design residual material. According to the test of different planning periods, different production scales and order characteristics, the present invention shows that the integration optimization effect of order daughter board combination mode, non-fixed-length order daughter board specifications, motherboard specifications and motherboard selection cross-section is obvious, and the optimization space is more obvious. The larger the design, the higher the quality.

In order to illustrate the process of optimizing design results by using non-fixed-length order specification flexibility and motherboard specification flexibility in the present invention, a certain group of production orders is taken as an example to illustrate the order design results as follows. The present invention combines order information based on objective order information and motherboard information. The information is optimally matched with the motherboard information to improve the utilization rate of the motherboard. According to the method of the present invention, when matching, the present invention uses the flexibility of non-fixed-length order specifications and the flexibility of mother board specifications to try all possible combinations of order daughter boards of different lengths, and generate multiple different order design results and mother board design schemes. , And calculate the residual material under different schemes, and then screen the feasible solutions. The design scheme with the least residual material, fewer mother boards, and higher yield rate is the optimal mother board design plan, so as to compare the mother board accordingly. The plate is rolled, the following is an example of the feasible results under two different non-fixed-length order sub-plate lengths:

Production order information:

The first order split and section selection result:

Order number	Daughter board length	Number of sub-boards	Section	Yield
A	9600	17	200*2200	94.35
B	9600	13	200*2200	94.35
C	9600	13	200*2200	94.35
D	9600	twenty two	200*2200	94.35

The result of the first order sub-board combination is as follows:

The result of the first order daughter board combination results in a total of 13 motherboards (the number on the far right is the number of corresponding motherboards required), of which order A combines itself to get 3 motherboards, the remaining 2 daughter boards, and order B combines itself Get 2 mother boards and 3 daughter boards. Order A combines the remaining 2 daughter boards with order B itself to combine the remaining 3 daughter boards to get 1 mother board. Similarly, order C combines itself to get 2 mother boards. Board, the remaining 3 daughter boards, the order D itself is combined to get 4 mother boards, the remaining 2 daughter boards, the order C itself combines the remaining 3 daughter boards and the order D itself combines the remaining 2 daughter boards to get 1 mother board board. Finally, the length of each mother board is 48000mm, each mother board contains 5 daughter boards, and the length of each daughter board is 9600mm. The order belongs to as shown in the figure above. In the design process, in addition to the combination of the order itself, the combination of order A and order B, and the combination of order C and order D avoid the generation of sub-boards corresponding to no orders. According to the selected section of each order: 200*2200, a total of 13 second-cut blanks are obtained through the conversion formula of mother board and slab. The length of each second-cut blank is 3585mm, and the remaining material is 0mm.

The second order split and section selection result:

Order number	Daughter board length	Number of sub-boards	Section	Yield
A	10000	17	200*2200	94.31
B	10000	12	200*2200	94.31
C	10000	12	200*2200	94.31
D	10000	twenty one	200*2200	94.31

The result of the second order sub-board combination is as follows:

The second kind of order daughter board combination results in a total of 16 motherboards, of which order A combines itself to get 4 motherboards, the remaining 1 daughter board, order B itself combines 3 motherboards, and order C combines itself to get 3 mother boards Board, Order D combines itself to get 5 motherboards, and the remaining 2 daughter boards, Order A combines the remaining 1 daughter board and Order D itself combines the remaining 2 daughter boards to get 1 mother board. Finally, 14 of the 16 motherboards obtained have a length of 40000mm, each motherboard contains 4 daughter boards, and the other 2 motherboards have a length of 30000mm. Each motherboard contains 3 daughter boards. The lengths are all 10000mm, and their orders are shown in the picture above. In the design process, in addition to its own combination, the combination design of order A and order D, as well as the adjustment of the order daughter board on the mother board, avoid the generation of excess materials corresponding to no orders. According to the selected section of each order: 200*2200, a total of 16 second-cut blanks are obtained through the conversion formula of mother board and slab, of which 14 second-cut blanks are 2990mm in length and the other two second-cut blanks are 2250mm in length , The remaining material is 0mm.

Through the calculation of the present invention, under the condition of satisfying the model constraints, according to the non-fixed-length order specification flexibility and the mother board specification flexibility, multiple feasible mother board design results can be obtained under different non-fixed-length order daughter board lengths, and then Select the best for all design results, and output the best design results. Take the above two motherboard designs as examples to illustrate the selection process. The first set of motherboard design results are longer than the second set of motherboard design results. Larger, smaller number of mother boards, and higher yield rate, so the first set of design results was finally selected. It can be seen that the present invention can make full use of the flexibility of non-fixed-length order specifications, the flexibility of mother board specifications, and the multi-selectivity of slab cross-sections to optimize the plate assembly and slab design process, and improve the plate assembly and slab design process. Design quality, improve the yield rate and reduce the design residual material.

In summary, from the perspective of application, considering the quality and efficiency of the solution, the design model system for plate assembly and slab design of medium and thick plates can effectively improve the quality of plate assembly and slab design, and create creation for reducing material loss in the production process and reducing production costs. Conditions: By significantly improving the efficiency of plate assembly and slab design in steel enterprises, the flexibility of the plate production organization has been effectively improved. In addition, the model system design process also facilitates process personnel to adjust and confirm design parameters, and the model system functions can adapt to the needs of flexible changes such as on-site production organization and production process adjustment.

The present invention is based on the actual needs of plate assembly and slab design problems of medium and thick plates, combined with consideration of the influence of production technology and equipment conditions on design goals and constraints, and is based on the non-fixed-length orders and specification uncertain characteristics of production orders. One-dimensional and two-dimensional plate assembly and slab design problems build an adaptable model, match appropriate model solving algorithms, high yield rate, low residual material rate, and high design efficiency, which will improve the rapid market of medium and thick plate enterprises Responsiveness has important meaning and application value.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean specific features described in conjunction with the embodiment or example , Structure, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above-mentioned terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and purpose of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims (19)

1. A design method for hot-rolled medium-thick plate assembly and slab considering the flexibility of non-fixed-length order specifications is characterized in that it specifically includes the following steps:

   S01, obtain motherboard information and production order information;

   S02, perform order preprocessing, and group the orders;

   S03, adopt the method of board assembly considering the flexibility of non-fixed-length order specifications to complete the motherboard design;

   S04: Carry out slab design, select and output the optimal two-cut billet plan according to the corresponding section;

   S05: Output the obtained second-cut billet plan to the steelmaking and hot rolling production planning system to prepare the steelmaking and continuous casting production plan and the hot rolling unit production plan, and then control the production operation and related equipment operations through the production plan.
2. The design method of hot-rolled medium-thick plate assembly and slab considering the flexibility of non-fixed-length order specifications according to claim 1, characterized in that:

   Acquire motherboard information and store it in the basic parameter database, or acquire and confirm motherboard assembly requirement information from the database, where the motherboard information includes length range, width range, and thickness range;

   Obtain and store the production order information in the order database, or obtain and confirm the production order information from the database. The production order information includes the contract number, product specification, length, width, thickness, steelmaking grade, rolled steel grade, and order quantity of the ordered product , Remaining quantity, remaining number of pieces, transportation method and delivery status.
3. The hot-rolled medium-thickness plate assembly and slab design method considering the flexibility of non-fixed-length orders according to claim 1, wherein the orders are grouped according to the sub-plate combinable rule.
4. The hot-rolled medium-thick plate assembly and slab design method that takes into account the flexibility of non-fixed-length orders according to claim 1, characterized in that: when the order is preprocessed, the orders are divided into one-dimensional combinations according to the width of the order sub-board Orders and two-dimensional combined orders; according to the order sub-board combination method, the two-dimensional combined orders are simplified to a double-width design of one-dimensional combined orders.
5. The design method of hot-rolled medium-thick plate assembly and slab considering the flexibility of non-fixed-length order specifications according to claim 1, wherein step S03 specifically includes:

   S031, select a group of orders that have not undergone motherboard design, and complete the motherboard design by taking into account the flexibility of non-fixed-length order specifications;

   S032: Determine whether the order in step S031 is a two-dimensional combination order, if so, complete the two-dimensional motherboard design according to the double-width design principle, otherwise perform step S033;

   S033: It is judged whether all the orders have completed the motherboard design, if not, step S3 is executed, and if all the orders have completed the motherboard design, step S04 is executed.
6. A design method for hot-rolled medium-thick plate assembly and slab considering the flexibility of non-fixed-length order specifications is characterized in that it specifically includes the following steps:

   S1: Acquire and store motherboard information in a basic parameter database, where the motherboard information includes a length range, a width range, and a thickness range;

   Obtain the production order information and store it in the order database. The production order information includes the contract number, product specifications, length, width, thickness, steelmaking grade, rolling grade, order quantity, remaining quantity, remaining number of pieces, transportation method and delivery status;

   Perform order preprocessing, divide the order into one-dimensional combination order and two-dimensional combination order according to the width of the order sub-board; simplify the two-dimensional combination order into a double-width design of the one-dimensional combination order according to the order sub-board combination method;

   S2: Group the orders according to the combinable rules of the daughter boards;

   S3, select a group of orders that have not been designed for the motherboard, and complete the motherboard design by taking into account the flexibility of non-fixed-length order specifications;

   S4: Determine whether the order in step S3 is a two-dimensional combination order, if so, complete the two-dimensional motherboard design according to the double-width design principle, otherwise perform step S5;

   S5: Judge whether all orders have completed the motherboard design, if not, perform step S3, if all orders have completed the motherboard design, then perform step S6;

   S6: Carry out slab design, select and output the optimal two-cut billet plan according to the corresponding section;

   S7, output the obtained second-cut billet plan to the steelmaking and hot rolling production planning system to prepare the steelmaking and continuous casting production plan and the hot rolling unit production plan, and then control the production operation and related equipment operations through the production plan.
7. The hot-rolled medium-thick plate assembly and slab design method considering the flexibility of non-fixed-length order specifications according to claim 1 or 6, characterized in that when the width of the order sub-plate is less than the lower limit of the rolling width of the hot rolling mill, It is a two-dimensional combination order, otherwise it is a one-dimensional combination order.
8. The design method of hot-rolled medium-thick plate assembly and slab considering the flexibility of non-fixed-length order specifications according to claim 4 or 6, characterized in that the two-dimensional combination order is converted into the double-width design of the one-dimensional combination order The method is:

   Set that the sum of the width of the daughter boards of all orders in the width direction does not exceed the maximum rolling width of the mother plate; the length of the mother plate of the two-dimensional combination is the sum of the length of the daughter plate with the largest length in the width direction;

   If the order sub-board combination method is that two sub-boards can be combined in the width direction, and the length and width of the two sub-boards are equal, the two-dimensional assembly problem can be treated as the double-width problem of the one-dimensional assembly. The pre-processing and post-processing of the two-dimensional combination order realize the two-dimensional board design. The pre-processing process simplifies the two-dimensional combination order to the double-width problem of the one-dimensional combination order, and the post-processing supplements the two-dimensional design of the two-dimensional combination order.
9. The hot-rolled medium-thick plate assembly and slab design method considering the flexibility of non-fixed-length orders according to claim 5 or 6, characterized in that, step S031 or S3 specifically includes:

   S31: Select the design section of the mother plate according to the corresponding relationship between the mother plate specification and the slab rolling specification, and calculate the length range of the mother plate;

   S32: Calculate the initial length of the daughter board for non-fixed-length orders and the number of initial orders;

   S33: Combine the ordered daughter boards to the mother board according to the daughter board combination constraint conditions to obtain a feasible motherboard design plan;

   S34: Establish an objective function and calculate the remaining material length of the mother board;

   S35: Use the solution improvement strategy to optimize the feasible solution;

   S36, obtain the optimized motherboard design scheme.
10. The hot-rolled medium-thick plate assembly and slab design method considering the flexibility of non-fixed-length order specifications according to claim 9, wherein the specific process of step S33 is:

    S331: Calculate the length range of the motherboard:

    Calculate the maximum rollable length of the mother plate under section k according to the conversion relationship between the mother plate and the slab

    

    And minimum rollable length

    

    At the same time, compare the maximum length of the motherboard to get the maximum length of the motherboard

    

    And minimum length

    

    among them,

    

    It is the maximum rolling length of the mother plate required by the rolling process, p refers to the mother plate, k is the slab section number, and j is the mother plate number;

    S332: Calculate the initial length of the daughter board for non-fixed-length orders

    

    And the number of initial orders

    

    The length of the daughter board for non-fixed-length orders is the range value

    

    Initial length

    

    And the number of initial orders

    

    Among them, h refers to the thickness of the mother board, DHL _i is the order weight of order i, w is the width of the order daughter board, and ρ _zg is the order product density;

    S333: Combine the order daughter boards into a rolling mother board:

    S3331, sort the order daughter boards in the order of length from largest to smallest or from smallest to largest, and calculate the parent

    

    S3332, if all the sub-boards have been combined, end the sub-board combination, otherwise go to the next step;

    S3333, select a daughter board with the longest order and compare the length of the daughter board

    

    And the remaining length of each motherboard

    

    If there is a mother board, you can put the order daughter board into it, select the mother board with the longest length and combine the daughter board to the mother board. If not, generate a new mother board and combine the daughter board to new

    

    S3334, cyclically execute steps S3331 to S3333 until all the daughter boards are combined.
11. The hot-rolled medium-thick plate assembly and slab design method considering the flexibility of non-fixed-length orders according to claim 9, wherein the constraint condition is an order quantity constraint; about each order sub-plate can only be combined To a mother board; non-fixed-length order daughter board length limit constraint; mother board length limit constraint; section selection constraint, the same order chooses the same section constraint;

    Or the constraints are: order quantity constraint; each order daughter board can only be combined on one mother board; non-fixed-length order daughter board length limit constraint; mother board minimum and maximum length limit constraint; mother board minimum and maximum width Restriction constraints; the minimum and maximum length constraints of the second blank; section selection constraints: the corresponding relationship between the product specifications of the production order and the section specifications, and the same section constraints are selected for the same production order.
12. The design method of hot-rolled medium and thick plate assembly and slab considering the flexibility of non-fixed-length order specifications according to claim 9 or 11, wherein the constraint conditions are:

    

    

    

    

    

    

    

    

    Among them, i is the order number, v is the serial number of the sub-board, m is the total number of orders, and q is the total number of sections.

    h is the thickness of the order daughter board,

    w is the width of the order daughter board,

    ρ _zg is the order product density,

    l _i,v are the lengths in order i,

    

    They are the minimum length and maximum length of the daughter board of order i, if it is a fixed-length order, there are

    

    DHL _i is the order weight of order i,

    d _i is the number of orders for order i;

    

    Is the length of mother board j,

    

    The maximum rolling length of the mother plate required by the rolling process,

    

    These are the minimum and maximum rollable lengths of the mother plate corresponding to the length of the second cut under the section k, which are calculated by the mother plate slab conversion formula;

    a _{i, v, j} are 0-1 variables, when the daughter board v of order i is combined with the mother board j, it is 1, otherwise it is 0;

    

    It is a 0-1 variable, it is 1 when order i selects section k for design, otherwise it is 0;

    Constraints (11) and (12) are order quantity constraints. Constraint (13) means that each order daughter board can only be combined on one mother board. Constraint (14) is a non-fixed-length order daughter board length limit constraint. Constraint (15) )～(17) are the length limit constraints of the mother board, and the constraint (18) is the section selection constraint. The same section is selected for the same order.
13. The design method of hot-rolled medium and thick plate assembly and slab considering the flexibility of non-fixed-length order specifications according to claim 9 or 11, wherein the constraint conditions are:

    

    

    

    

    

    

    

    

    

    

    Among them, i is the order number, v is the serial number of the sub-board, m is the total number of orders, and q is the total number of sections.

    h is the thickness of the order daughter board,

    w is the width of the order daughter board,

    ρ _zg is the order product density,

    l _i,v are the lengths in order i,

    

    They are the minimum length and maximum length of the daughter board of order i, if it is a fixed-length order, there are

    

    DHL _i is the order weight of order i,

    d _i is the number of orders for order i;

    

    Is the length of mother board j,

    

    The maximum rolling length of the mother plate required by the rolling process,

    

    These are the minimum and maximum rollable lengths of the mother plate corresponding to the length of the second cut under the section k, which are calculated by the mother plate slab conversion formula;

    

    Is the width of mother board j,

    

    Is the maximum width of the motherboard,

    

    Is the length of the second cut blank corresponding to the mother board j,

    

    They are the minimum and maximum lengths of two cut blanks,

    a _{i, v, j} are 0-1 variables, when the daughter board v of order i is combined with the mother board j, it is 1, otherwise it is 0;

    

    It is a 0-1 variable, it is 1 when order i selects section k for design, otherwise it is 0;

    dou _i is a 0-1 variable, it is 1 when the order is a two-dimensional combination order, otherwise it is 0;

    Constraints (21) and (22) are order quantity constraints. Constraint (23) means that each order daughter board can only be combined on one motherboard. Constraint (24) is a non-fixed-length order daughter board length limit constraint. Constraint (25) )～(27) is the limit of the length of the mother board, the constraint (28) is the limit of the maximum width of the mother board, the constraint (29) is the section selection constraint, the same section is selected for the same order, and the constraint (210) is the length limit of the second cut. Constraints, by solving the model, you can get the design plan of the two-cut blank and the mother board that needs to be produced to meet the order demand.
14. The design method of hot-rolled medium-thick plate assembly and slab considering the flexibility of non-fixed-length order specifications according to claim 9, wherein the objective function is to minimize the amount of residual material;

    Or the objective function includes minimizing the amount of residual material; minimizing the material lost during rolling production; and minimizing the number of mother plates.
15. The design method of hot-rolled medium-thick plate assembly and slab considering non-fixed-length order specification flexibility according to claim 9 or 14, wherein the objective function is:

    

    L _yc is the length of the remaining material of the mother board, yc is the reference parameter of the remaining material,

    

    Is the length of mother board j, l _{i, v} are the lengths in order i, a _{i, v, j} are 0-1 variables, when the daughter board v of order i is combined with mother board j, it is 1, otherwise it is 0 .
16. The method for designing hot-rolled medium-thickness plates and slabs considering the flexibility of non-fixed-length order specifications according to claim 9 or 14, wherein the objective function comprises:

    

    

    

    L _yc is the length of the remaining material of the mother board, yc is the reference parameter of the remaining material,

    L _ss is the material lost in the production of the two-cut billet, ss is the parameter of the lost material,

    

    with

    

    Are the thickness and width of the two cut blanks corresponding to section k,

    

    It is a 0-1 variable, when the mother board j selects the section k, it is 1, otherwise it is 0,

    N is the total number of motherboards,

    

    It is a 0-1 variable. It is 1 when the motherboard j is used, otherwise it is 0.
17. The hot-rolled medium-thick plate assembly and slab design method considering the flexibility of non-fixed-length order specifications according to claim 9, wherein the specific steps of using the solution improvement strategy to improve the design result of the mother plate in step S35 are :

    S351: Arrange the daughter board combination results obtained in S33 in descending or ascending order of the length of the mother board;

    S352: Check whether all meet the minimum length of the motherboard

    

    If all requirements are met, the mother board design is ended, and step S353 is executed; otherwise, the order specification flexibility, mother board specification flexibility and slab section are used to selectively adjust the order daughter board length, mother board length and mother board selection section , Optimize the design results of the motherboard;

    S353: Output the improved motherboard design result.
18. A hot-rolled medium-thick plate assembly and slab design model system that takes into account the flexibility of non-fixed-length orders, and is characterized in that it includes a data layer and an application layer,

    The data layer includes a user order database, a basic design parameter database, a design rule parameter database and a design result database;

    The application layer receives the data information in the data layer and uses the user interface to obtain order information. The application layer uses the method of any one of claims 1-17 to design hot-rolled medium and thick plates and slabs and output them through the user interface. Prepare the steelmaking production plan with the obtained two-cut billet plan;

    The operation results of the application layer are output to the steelmaking production planning system and the hot rolling production planning system to prepare the steelmaking-continuous casting production plan and the hot rolling unit production plan, and then control the production operation and related equipment operations through the production plan.
19. The model system according to claim 18, further comprising a user layer, the user layer stores user information and sets usage rights of different users according to production management requirements.

Images