Simulation system and simulation method for slab hot rolling production plan

Abstract

The invention provides a simulation system and simulation method for slab hot rolling production, and the system comprises a slab library module, a heating furnace module, a hot rolling module, a product library module and an evaluation module, the slab library module is used for storing initial slab objects and setting slab charging boundary conditions; the heating furnace module is used for simulating the heating process of the initial slab object according to the heating constraint; the hot rolling module is used for simulating the rolling process of the heated initial plate blank object according to rolling constraints; the product library module is used for storing rolled finished plate blank objects; and the evaluation module is used for evaluating the attribute parameters of the finished plate blank object and the operation conditions of the heating furnace module and the hot rolling module, and optimizing the heating constraint. The method solves the problem that the actual production effect of the hot rolling production line scheme is difficult to verify by adopting a mathematical method in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of slab hot rolling production, and in particular to a simulation system and a simulation method for slab hot rolling production. Background Art

[0002] As one of the important steel products, plate and strip materials are widely used in the fields of construction, bridges and equipment parts, and their orders are characterized by multiple specifications and discreteness. The process of plate and strip material production is mainly a hot rolling production line consisting of a heating furnace and hot rolling. In the actual production process, the operation of the hot rolling production line is affected by random factors such as equipment, raw materials, energy and labor, showing the characteristics of discreteness, randomness, concurrency and recursion. It is a typical discrete event system. It has always been difficult to verify the actual production effect of the formulated hot rolling production line plan. There is a certain degree of uncontrollability in equipment, orders and labor, and it is difficult to describe in detail using mathematical methods. The assumptions and abstractions of the problem lead to large deviations from actual applications, and manual intervention and modification are required from time to time, resulting in unsatisfactory application results. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a simulation system and method for slab hot rolling production, which solves the problem in the prior art that it is difficult to verify the actual production effect of the hot rolling production line solution using mathematical methods.

[0004] According to an embodiment of the present invention, a simulation system for slab hot rolling production includes a slab library module, a heating furnace module, a hot rolling module, a product library module and an evaluation module.

[0005] The slab library module is used to store the initial slab object and set the slab furnace entry boundary conditions;

[0006] The heating furnace module is used to simulate the heating process of the initial slab object according to the heating constraints;

[0007] The hot rolling module is used to simulate the process of rolling the heated initial slab object according to the rolling constraints;

[0008] The product library module is used to store the finished slab objects after rolling;

[0009] The evaluation module is used to evaluate the property parameters of the finished slab object and the operation conditions of the heating furnace module and the hot rolling module, and to optimize the heating constraints.

[0010] Preferably, the slab entering the furnace boundary conditions include the planned slab entering the furnace time, the slab entering the furnace delay rate and the slab entering the furnace delay time. The slab entering the furnace delay time is generally set to 5-30min. The slab entering the furnace delay rate of each initial slab object is independent of each other, and the mean slab entering the furnace delay rate of all initial slab objects is inversely proportional to the mean slab entering the furnace delay time.

[0011] Preferably, the heating furnace module comprises an in-furnace allocation module, a plurality of heating furnace units and an out-furnace allocation module;

[0012] The furnace allocation module is used to allocate the initial slab object to the idle heating furnace unit;

[0013] The furnace discharging distribution module is used to control the furnace discharging order of the initial slab objects after simulated heating in the heating furnace;

[0014] The heating furnace unit is used to simulate heating of the initial slab object.

[0015] Preferably, the hot rolling module comprises a plurality of rolling units, a transport module and a rolling distribution module;

[0016] The rolling allocation module is used to allocate the heated initial slab object to the rolling unit;

[0017] The rolling unit is used to perform rolling simulation of three steps of rough rolling, finish rolling and laminar cooling on the heated initial slab object to obtain a finished slab object;

[0018] The transport module is used to simulate the transport flow of initial slab objects during the rolling process.

[0019] Preferably, at the same time, each rolling unit has one and only one initial slab object in different rolling links, and a virtual slab object is added between two adjacent initial slab objects. The attribute of the virtual slab object is only a time parameter, which indicates the rolling preparation time set between two adjacent rolling links.

[0020] On the other hand, the present invention further provides a simulation method for slab hot rolling production, which is applied to the above-mentioned simulation system for slab hot rolling production, comprising:

[0021] Set multiple initial slab objects with different attribute parameters and store them in the slab library module, and set the slab furnace entry boundary conditions of the slab library module;

[0022] Use the heating furnace module to assign a heating furnace to each initial slab object leaving the warehouse and perform heating simulation on the slab object according to the preset heating constraints;

[0023] According to the preset rolling constraints, the hot rolling module is used to simulate the rolling of the heated initial slab object to obtain the finished slab object;

[0024] The evaluation module is used to evaluate the property parameters of the finished slab object and the operation status of the heating furnace module and the hot rolling module, and the preset heating constraints are modified according to the evaluation results.

[0025] Preferably, when the furnace allocation module allocates the initial slab objects, the initial slab objects are preferentially allocated to the heating furnace unit with the least number of initial slab objects being heated.

[0026] Preferably, the heating constraints are the residence time of the initial slab objects in the heating furnace units and the number of initial slab objects that can be accommodated simultaneously in each heating furnace unit;

[0027] The rolling constraints include the maximum jump of property parameters between two adjacent heated initial slab objects and the cost loss of unarranged slabs.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] A simulation method is adopted to establish an initial slab object that is the same as the actual slab, and the initial slab object is simulated to be heated and rolled according to the preset heating constraints and rolling constraints. The attribute parameters of the finished slab object, the operation status of the heating furnace module and the hot rolling module are quantitatively evaluated. By comparing the deviation range between the preset production results and the evaluation results, the advantages and disadvantages and feasibility of the heating constraints and rolling constraints are verified, and targeted adjustments and optimizations are made to improve the feasibility of the heating constraints and rolling constraints. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 4 is a diagram of the simulation system architecture of an embodiment of the present invention.

[0031] Figure 2 It is a simulation flow chart of an embodiment of the present invention.

[0032] Figure 3 It is a Gantt chart of the simulation execution results of an embodiment of the present invention.

[0033] Figure 4 Schematic diagram of resource utilization of a heating furnace unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0035] like Figure 1As shown, the embodiment of the present invention proposes a simulation optimization system for slab hot rolling production, including a slab library module, a heating furnace module, a hot rolling module, a product library module and an evaluation module.

[0036] The slab library module is used to store initial slab objects and set the boundary conditions for slabs entering the furnace. Each initial slab object has its own attribute parameters, including width, thickness, hardness, temperature, rolling length and other attributes. These attribute parameters are exactly the same as the attribute parameters of the actual produced slabs.

[0037] The boundary conditions for slab entering the furnace include the planned slab entering the furnace time, the slab entering the furnace delay rate and the slab entering the furnace delay time. The setting range of the slab entering the furnace delay time is 5-30min. The slab entering the furnace delay rate of each initial slab object is independent of each other. In general, the slab entering the furnace delay rate is inversely proportional to the slab entering the furnace delay time, that is, the higher the slab entering the furnace delay rate, the shorter the delay time when the initial slab is delayed in entering the furnace. On the contrary, the lower the slab entering the furnace delay rate, the longer the delay time when the initial slab is delayed in entering the furnace.

[0038] The heating furnace module is used to simulate the heating process of the initial slab object according to the heating constraints. The heating furnace module includes a furnace entry allocation module, a plurality of heating furnace units and a furnace exit allocation module.

[0039] The furnace allocation module is used to allocate the initial slab objects to the idle heating furnace units. When allocating the initial slab objects, the furnace allocation module will give priority to allocating the initial slab objects to the heating furnace unit with the least number of initial slab objects being heated. At the same time, each initial slab object will only be allocated to one heating furnace unit.

[0040] The furnace distribution module is used to control the furnace discharge order of the initial slab objects after simulated heating in the heating furnace. The furnace discharge distribution module controls the furnace discharge rhythm of the slabs according to the operation of the subsequent hot rolling module and the time the initial slab objects are in the heating furnace unit. When the previous initial slab object completes the first link in the hot rolling process and the first link is reset, it starts waiting for the next initial slab object (i.e. considering the preparation time of the adjacent hot rolling modules). When the slab with the corresponding rolling number completes the heating furnace processing, the corresponding initial slab objects are taken out from all heating furnace units and sent to the subsequent hot rolling units according to the first-in-first-out principle to ensure that the furnace discharge order of the heated initial slab objects is consistent with the given rolling order.

[0041] The heating furnace unit is used to simulate the heating of the initial slab object. At the same time, the heating furnace unit has a capacity limit, and the position of each initial slab object in the heating furnace is unique, and there will be no interference between each other. In addition, the heating temperature inside each heating furnace unit is always constant, and the heating time of each initial slab object in the heating furnace must meet the time window requirements specified by the process and the heating time must be continuous.

[0042] The hot rolling module is used to simulate the process of rolling the initial slab object after heating according to the rolling constraints, including the complete process of rough rolling, finishing rolling and laminar cooling. In this process, the high-temperature slab coming out of the heating furnace undergoes continuous rolling, and its shape and temperature change continuously, gradually changing from high-temperature slab to medium-high temperature rough-rolled strip, medium-temperature finishing strip and low-temperature finished strip.

[0043] The hot rolling module includes a plurality of rolling units, a transport module and a rolling distribution module;

[0044] Among them, the rolling allocation module is used to allocate the heated initial slab objects to the rolling units, and the number of rolling units is set according to the actual production plan.

[0045] The rolling unit is used to simulate the three rolling steps of rough rolling, finish rolling and laminar cooling of the heated initial slab object to obtain the finished slab object. In addition, there are restrictions on the rolling time and total length of the initial slab object in each step of the rolling unit. Too long or too short time will affect the quality of the final product. Too long total length will lead to uneven rolling of the slab, which will also affect the quality of the final product.

[0046] In addition, at the same moment, each rolling unit has only one initial slab object in different rolling links. At the same time, a virtual slab object is added between two adjacent initial slab objects. The attribute of the virtual slab object is only the time parameter, which indicates the rolling preparation time set between two adjacent rolling links. The virtual slab object is added to separate two adjacent initial slab objects to avoid mutual influence.

[0047] The transportation module is used to simulate the transportation flow of the initial slab object during the rolling process. In actual production, each rolling link is not completely seamlessly connected. After each slab passes through one of the rolling links, it needs to be transported to the next link by means of transportation tools such as conveyor belts. Therefore, in this application, the transportation module is used to simulate the transportation between each rolling link.

[0048] The product library module is used to store the finished slab objects after rolling.

[0049] The evaluation module is used to evaluate the property parameters of the finished slab object and the operation status of the heating furnace module and the hot rolling module, and to modify the preset heating constraints according to the evaluation results.

[0050] The evaluation module records the process and specific time of each initial slab object in the heating simulation and hot rolling simulation of the heating furnace module and the hot rolling module, and generates a product output list and a statistical slab processing Gantt chart, such as Figure 3 As shown in the figure, in addition, the operation status and resource statistics of the heating furnace module and the hot rolling module are analyzed, and the equipment resource utilization rate of the heating furnace and the equipment resource utilization rate of the rolling mill are calculated, such as Figure 4 shown.

[0051] like Figure 2 As shown, on the other hand, an embodiment of the present invention further provides a simulation method for slab hot rolling production, which is applied to the above-mentioned simulation optimization system for slab hot rolling production, and includes:

[0052] Set multiple initial slab objects with different attribute parameters and store them in the slab library module, and set the slab furnace entry boundary conditions of the slab library module;

[0053] Use the heating furnace module to assign a heating furnace to each initial slab object leaving the warehouse and perform heating simulation on the slab object according to the preset heating constraints;

[0054] According to the preset rolling constraints, the hot rolling module is used to simulate the rolling of the heated initial slab object to obtain the finished slab object;

[0055] The evaluation module is used to evaluate the property parameters of the finished slab object and the operation status of the heating furnace module and the hot rolling module. The preset heating constraints can be modified according to the evaluation results.

[0056] In this embodiment, a corresponding simulation system is established for the following production conditions:

[0057] (1) The number of heating furnaces is constant, set to 3, and the operation of each heating furnace does not affect each other;

[0058] (2) Each heating furnace has the same capacity and is a walking beam heating furnace;

[0059] (3) The rolling mill is limited to one unit, including a roughing roll group, a finishing roll group and a laminar cooling device;

[0060] (4) The interruption time for changing the rolls of the rolling mill between rolling units is a constant value, set to 120 min;

[0061] (5) The rolling time of a single slab is 1 to 3 minutes; the slab enters the heating furnace in accordance with the first-in-first-out rule, and must reach the furnace exit temperature range when it comes out of the furnace. It must be rolled immediately after it comes out of the furnace and must not stay outside the furnace.

[0062] (6) The delay rate of slab into the furnace is 5%, and the delay time is 20 minutes

[0063] The established simulation system includes heating furnace module, hot rolling module, related methods and statistical charts.

[0064] The heating furnace module contains three logistics lines corresponding to three heating furnaces. Each heating furnace has a capacity of 15 slabs. The three heating furnace routes are respectively equipped with "heating furnace allocation" and "furnace out allocation" stations at the beginning and end. "Heating furnace allocation" is used to control the selection of heating furnaces for slabs; the "furnace out allocation" station controls the rhythm of slabs out of the furnace according to the rolling plan and the actual time the slabs are in the furnace. A complete route including rough rolling, finishing rolling and laminar cooling is established in the hot rolling module. On this route, the high-temperature slabs coming out of the heating furnace undergo continuous rolling, and their morphology and temperature change continuously. In the simulation system, the slabs are transformed from high-temperature slabs, medium-high temperature rough-rolled slabs, medium-temperature finishing-rolled slabs to low-temperature finished plate casting machines, and finally the finished products are generated and enter the finished product warehouse.

[0065] After the system is initialized, the slabs in the slab list are called out from the slab warehouse; they are sent to the heating furnace module for heating furnace allocation, heating furnace step heating and waiting for temperature, and the "furnace allocation" is used to determine whether the slabs meet the furnace discharge conditions; then they enter the hot rolling module for rough rolling, finishing rolling and laminar cooling; finally, the rolled products are sent to the finished product warehouse.

[0066] The simulation preset slab hot rolling production plan (part) is shown in Appendix 1, which shows that the equipment number of each rolling unit corresponding to the rolled slab number entering the heating furnace, as well as the corresponding minimum heating time and transportation time from the heating furnace to the rolling equipment are given in the figure.

[0067] Table 1 Slab hot rolling production schedule (part)

[0068]

[0069]

[0070] After inputting each simulation parameter into the system, the actual execution status of the preset plan can be obtained (such as Figure 3 ) and device resource utilization (as shown in Figure 4 shown), Figure 3 The equipment number and time of each slab entering each process, as well as its position in the heating furnace at different times, are given in the table. Figure 4The utilization rate of each equipment is given. The resource utilization rates of the three heating furnaces and the rolling mill are 94.6%, 95.0%, 94.6% and 100% (the sum of "Working", "Waiting" and "Blocked") respectively. According to the production plan, the resource utilization rate of the rolling mill is 100%, indicating that the rolling mill is in continuous rolling production at this time. The resource utilization rate of the heating furnace is about 95%, indicating that the preset heating and rolling constraints match the planned goals at this time and can meet the continuous rolling production needs; if the resource utilization rate of the rolling mill is lower than 100%, it means that the rolling mill is not in continuous rolling production. If the resource utilization rate of the heating furnace is not 100%, it is necessary to modify the heating constraints, adjust the heating furnace capacity and heating time, and ensure the continuous production of the rolling mill; if the resource utilization rate of the heating furnace is 100%, and the heating constraints are at the limit of their range and cannot guarantee the production of the rolling mill, it is necessary to consider adding a heating furnace or modify the rolling plan to ensure smooth production.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. A simulation system for slab hot rolling production, characterized in that: It includes slab library module, heating furnace module, hot rolling module, product library module and evaluation module. The slab library module is used to store the initial slab object and set the slab furnace entry boundary conditions; The heating furnace module is used to simulate the heating process of the initial slab object according to the heating constraints; The hot rolling module is used to simulate the process of rolling the heated initial slab object according to the rolling constraints; The product library module is used to store the finished slab objects after rolling; The evaluation module is used to evaluate the property parameters of the finished slab object and the operation conditions of the heating furnace module and the hot rolling module, and to optimize the heating constraints.

2. A simulation system for slab hot rolling production as claimed in claim 1, characterized in that: The slab entering the furnace boundary conditions include the planned slab entering the furnace time, the slab entering the furnace delay rate and the slab entering the furnace delay time. The slab entering the furnace delay time is generally set to 5-30min. The slab entering the furnace delay rate of each initial slab object is independent of each other, and the mean slab entering the furnace delay rate of all initial slab objects is inversely proportional to the mean slab entering the furnace delay time.

3. A simulation system for slab hot rolling production as claimed in claim 1, characterized in that: The heating furnace module includes a furnace entry distribution module, a plurality of heating furnace units and a furnace exit distribution module; The furnace allocation module is used to allocate the initial slab object to the idle heating furnace unit; The furnace discharging distribution module is used to control the furnace discharging order of the initial slab objects after simulated heating in the heating furnace; The heating furnace unit is used to simulate heating of the initial slab object according to the set heating constraints.

4. A simulation system for slab hot rolling production as claimed in claim 3, characterized in that: The hot rolling module includes a plurality of rolling units, a transport module and a rolling distribution module; The rolling allocation module is used to allocate the heated initial slab object to the rolling unit; The rolling unit is used to perform rolling simulation of three steps of rough rolling, finish rolling and laminar cooling on the heated initial slab object according to rolling constraints to obtain a finished slab object; The transport module is used to simulate the transport flow of initial slab objects during the rolling process.

5. A simulation system for slab hot rolling production as claimed in claim 4, characterized in that: At the same moment, each rolling unit has one and only one initial slab object in different rolling links, and a virtual slab object is added between two adjacent initial slab objects. The attribute of the virtual slab object is only the time parameter, which indicates the rolling preparation time set between two adjacent rolling links.

6. A simulation method for slab hot rolling production, characterized in that: The method is applied to a simulation system for slab hot rolling production as claimed in any one of claims 1 to 5, comprising: Set multiple initial slab objects with different attribute parameters and store them in the slab library module, and set the slab furnace entry boundary conditions of the slab library module; Use the heating furnace module to assign a heating furnace to each initial slab object leaving the warehouse and perform heating simulation on the slab object according to the preset heating constraints; According to the preset rolling constraints, the hot rolling module is used to simulate the rolling of the heated initial slab object to obtain the finished slab object; The evaluation module is used to evaluate the property parameters of the finished slab object and the operation status of the heating furnace module and the hot rolling module, and the preset heating constraints are modified according to the evaluation results.

7. A method for simulating slab hot rolling production as claimed in claim 6, characterized in that: When the furnace allocation module allocates the initial slab objects, the initial slab objects are preferentially allocated to the heating furnace unit with the least number of initial slab objects being heated.

8. A method for simulating slab hot rolling production as claimed in claim 7, characterized in that: The heating constraints are the residence time of the initial slab object in the heating furnace unit and the number of initial slab objects that can be accommodated simultaneously in each heating furnace unit; The rolling constraints include the maximum jump of property parameters between two adjacent heated initial slab objects and the cost loss of unarranged slabs.

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