Weight maximization design method for cold-rolled base material casting blank
By taking into account the limit conditions of each process in the weight design of cold-rolled base casting blanks and determining the maximum length and width of the casting blanks, the problem of inconsistent evaluation methods of each process and extensive classification layers in the existing design process is solved, and the problem of inconsistent evaluation methods and extensive classification layers is achieved. The maximum weight design of cast billets improves production efficiency and finished product quality.
Patent Information
- Application Number
- CN202411490267.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2025-02-14
AI Technical Summary
During the existing cold rolled base casting weight design process, the evaluation methods for the restriction conditions of each process are not uniform and the classification layers are extensive, resulting in the weight design of the casting blank being too small and the production efficiency cannot be maximized.
According to the steel specifications of the target finished cold-rolled steel coil, the width of the casting billet is determined based on the limited conditions such as hot rolling width and optimal casting width, and the multi-condition constraints such as the material yield of each process and the maximum single weight capacity limit of the process are considered. Normalize to the maximum casting length limit, and then design the maximum casting weight in association.
Break the problem of inconsistent evaluation methods of various process restrictions and extensive classification and layering in traditional design process, improve the rolling rhythm and process yield of hot rolling and cold rolling, reduce process manufacturing costs, avoid waste of equipment capacity, and improve finished steel coils Weight hit accuracy.
Smart Images
Figure CN119442636A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of billet design and manufacturing, and in particular to a method for maximizing the weight of a cold-rolled base material billet. Background Art
[0002] The weight design of cold-rolled base material ingot is the basic link in the whole process production of cold-rolled products of steel enterprises. The quality of ingot weight design has an important impact on key indicators such as production efficiency, process yield rate, and energy consumption cost.
[0003] In the existing cold-rolled base material ingot weight design process, the correlation analysis between various production constraints is not considered enough, and the classification level is relatively coarse, resulting in a small ingot weight design, which cannot maximize production efficiency.
[0004] (1) The maximum length of the hot rolling heating furnace is limited to 11.5m. The conventional design directly designs the weight of the ingot according to the thickness of the ingot * the width of the finished strip * 11.5m * the density of steel. When the actual width of the ingot is greater than the width of the finished strip, the length of the ingot is shortened during cutting to meet the ingot weight design, resulting in a waste of heating furnace capacity;
[0005] (2) Considering the maximum fixed width capacity of hot rolling, the conventional design designs the ingot weight according to the maximum width and the maximum length limit of the heating furnace. The ingot may be too large and exceed the condition constraint of the maximum outer diameter of the hot rolling coiler of 2.1m, resulting in the inability to unload the coil. Therefore, it is necessary to make a conditional judgment again, and the ingot weight design efficiency is low;
[0006] (3) Hot-rolled thin-gauge production is affected by temperature drop, and usually limits the cold-rolled finished product thickness to less than 0.5 mm (generally corresponding to the hot-rolled finished product thickness of 1.8-2.5 mm) and the corresponding ingot length to less than 9 m. This classification level is too coarse, and the hot-rolled finished products of 1.8 mm and 2.5 mm share the same ingot length constraint, which results in a large waste of weight design for ingots with specifications greater than 1.8 mm. They should be normalized to the hot-rolled rolling length constraints corresponding to different finished product thicknesses, and then correspond to the ingot length constraints;
[0007] (4) The yield rates of products of different steel grades and specifications vary. Conventional design uses the average yield rate of the process as the design benchmark, resulting in a large deviation between the quality design of some ingots and the target finished product coil weight, causing the weight of the individual coils to be unqualified.
[0008] Therefore, there is an urgent need to design a method for maximizing the weight of cold-rolled base material ingots. The technical problem to be solved is that in the existing cold-rolled base material ingot weight design process, the evaluation methods of the restriction conditions of each process are not unified and the classification levels are rough, resulting in the ingot weight design being too small and the production efficiency cannot be maximized. Summary of the invention
[0009] In view of the problems existing in the prior art, the purpose of the present invention is to provide a method for maximizing the weight design of cold-rolled base material ingots, according to the steel grade specifications of the target finished cold-rolled steel coil, the ingot width is determined based on the hot rolling fixed width capacity and the optimal group casting width and other limiting conditions, and the yield rate of each process, the maximum unit weight capacity limit of the process and other multi-condition constraints are comprehensively considered, normalized to the maximum ingot length limit, and then the maximized ingot weight is designed in association. The problems of inconsistent evaluation methods and extensive classification levels of the constraints of each process in the traditional design process are broken, the rolling rhythm of hot rolling and cold rolling, the process yield rate index, and the process manufacturing cost are improved.
[0010] The technical solution adopted by the present invention to solve the technical problem is: a method for maximizing the weight of cold-rolled base material casting billet, comprising the following steps:
[0011] S1. Obtain basic order information;
[0012] S2, determine the thickness of the ingot h0 = 230 mm;
[0013] S3, determine the thickness h1 of the hot-rolled material;
[0014] S4. Confirm the billet process loss data according to the order basic information. The yield rate of the strip after the hot rolling process is μ1, the yield rate of the pickling process is μ2, and the yield rate of the continuous annealing process is μ3;
[0015] S5. Determine the width of the ingot: determine the width w1 of the cold-rolled base material hot-rolled coil according to the finished product width tolerance a, the cold-rolling process disc shear edge limit b, the annealing furnace narrowing amount c, and the hot-rolling width tolerance d; design the conventional ingot width w2 of different width ranges according to the hot-rolling width setting capacity, w2>w1;
[0016] S6. Taking into account the constraints of each process, determine the maximum length L of the ingot;
[0017] S7. Calculate the maximized ingot weight weight, weight = ρ*L*W2*h0. The calculation result is directly applied to the ingot quality design to obtain the maximized ingot weight within the range allowed by the equipment capacity.
[0018] Specifically, the basic order information in step S1 includes but is not limited to the cold-rolled product category code, steel grade code, strip thickness height, strip width width, strip width tolerance a and trimming process.
[0019] Specifically, the hot-rolled incoming material thickness h1 in step S3 is calculated based on the cold-rolled product category code, strip thickness and strip width through a quality design comparison table.
[0020] Specifically, the billet process loss data in step S4 is obtained by querying and confirming the yield rate data of the finished strip steel after the process through the standard yield rate comparison table of steel type specifications in each process.
[0021] Specifically, the width w1 of the hot rolled coil of the cold rolled base material in step S5 includes:
[0022] Pickled and cold hardened uncut roll w1 = width + a + d;
[0023] Pickled and cold-hardened trimmed roll w1 = width + a + b + d;
[0024] Normal cold-dip and galvanized uncut coils w1 = width + a + c + d;
[0025] Normal cold-dip and galvanized trimmed coils w1=width+a+b+c+d.
[0026] Specifically, the maximum ingot length L in step S6 is determined on the basis of determining the ingot width w2, and then comprehensively considering the constraints of each process. The links that restrict the ingot length of the cold-rolled product include but are not limited to: the maximum weight m of the crane hoisting, the maximum diameter of the cold-rolled coiling, the maximum diameter of the hot-rolled coiling R, the maximum rolling length l of the hot-rolled thin specification, the maximum slab length of the heating furnace, the minimum length of the steelmaking cut-to-length, and the maximum ingot length limited by the heating furnace loading capacity is L0.
[0027] Specifically, the maximum weight of the crane hoisting is m, and the maximum billet length is limited to L1=m / μ1 / h0 / ρ / w2. The corresponding maximum billet length is calculated based on the maximum weight of the crane hoisting in other processes; where ρ is the density of steel;
[0028] The maximum hot rolling coiling diameter R limits the maximum billet length L2 = π*(R2-r2) / 4*w1*ρ / w2 / h0 / ρ / μ1; where r is the inner diameter of the hot rolling coil. The corresponding maximum billet length is calculated based on the maximum coiling diameter of other processes;
[0029] The maximum rolling length of hot-rolled thin gauge is l, and the limit billet length is L3 = h1*w1*l / w2 / h0 / μ1;
[0030] The minimum value of all the ingot lengths calculated above is taken to determine the maximum ingot length L, which is determined by comprehensively considering the constraints of each process, L=min{L0, L1, L2, L3, ...}.
[0031] The present invention has the following beneficial effects:
[0032] The method for maximizing the weight of cold-rolled base material ingot designed in the present invention breaks the problems of inconsistent evaluation methods and rough classification levels of restriction conditions of each process in the traditional design process, and comprehensively considers the restriction conditions of each process to determine the maximum ingot length. Under the premise of avoiding production accidents caused by exceeding the equipment capacity, it minimizes the waste of equipment capacity of the heating furnace, coiler, crane and other processes.
[0033] The method for maximizing the weight of cold-rolled base material ingot designed in the present invention is beneficial to increasing the unit weight of cold-rolled base material steel coil, improving the hot rolling and cold rolling efficiency, the process yield rate, and reducing the process manufacturing cost.
[0034] The method for maximizing the weight of cold-rolled base material ingots designed in the present invention takes into account the differences in the yield rates of products of different steel grades and specifications during the ingot quality design process, thereby improving the weight accuracy of the finished steel coils and improving the weight accuracy of the finished steel coils being divided and delivered. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] Figure 1 It is a flow chart of a method for maximizing the weight of cold rolled base material ingot. DETAILED DESCRIPTION
[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely further describe the technical solutions in the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.
[0037] like Figure 1 As shown, a method for maximizing the weight of a cold-rolled base material casting slab comprises the following steps:
[0038] 1. Obtain basic order information:
[0039] Enter the cold rolled product category code required for the order, such as GHA pickling, GHB cold hardening, GHC normal cold rolling, GHD galvanizing.
[0040] Enter the cold rolled product steel grade code required for the order. For example, GHC01 represents general cold rolled DC01, and GHC02 represents general cold rolled DC02.
[0041] Enter the cold-rolled product strip thickness height required for the order, such as 0.5mm, 1.2mm, etc.
[0042] Enter the cold rolled product strip width required for the order, such as 1000mm, 1200mm, 1500mm, etc.
[0043] Enter the width tolerance a of the cold-rolled product strip width required by the order, such as 3mm, 5mm, etc.
[0044] Enter the trimming process of the cold rolled products required by the order, such as trimming in the pickling process, trimming in the finished product process, or no trimming.
[0045] 2. Determine the ingot thickness h0 = 230mm; in long-process steel enterprises, the ingot thickness h0 is generally relatively fixed, generally h0 = 230mm.
[0046] 3. Determine the hot-rolled incoming material thickness h1, which is calculated based on the cold-rolled product category code, strip thickness and strip width through the quality design comparison table. For example, for common cold-rolled DC01 steel, 0.5mm thickness, 1250mm width strip steel, the hot-rolled incoming material thickness h1 = 3.0mm is determined according to the quality design specifications of a certain enterprise.
[0047] 4. According to the basic information of the order, confirm the process loss data of the billet, and query and confirm the yield rate data of the finished strip through the process through the standard yield rate comparison table of steel grades and specifications of each process. For example, for DC01 steel grade, 0.5mm thickness, 1250mm width, and finished process trimming strip steel, the yield rate of the strip after the hot rolling process is μ1, the yield rate of the pickling process is μ2, and the yield rate of the continuous annealing process is μ3.
[0048] 5. Determine the width of the ingot: Determine the width w1 of the cold-rolled base material hot-rolled coil according to the finished product width tolerance a, the cold-rolling process disc shear edge limit b, the annealing furnace narrowing amount c, and the hot-rolling width tolerance d:
[0049] Pickled and cold hardened uncut roll w1 = width + a + d;
[0050] Pickled and cold-hardened trimmed roll w1 = width + a + b + d;
[0051] Normal cold-dip and galvanized uncut coils w1 = width + a + c + d;
[0052] Normal cold-dip and galvanized trimmed coils w1=width+a+b+c+d.
[0053] According to the hot rolling fixed width capacity, the conventional billet width w2 of different width ranges is designed, w2>w1; for example, the corresponding billet width of 900-1150mm hot rolled coil width is designed to be 1190mm.
[0054] 6. Comprehensively consider the constraints of each process to determine the maximum ingot length L; on the basis of determining the billet width w2, comprehensively consider the constraints of each process to determine the maximum ingot length L. The links that restrict the ingot length of the cold-rolled product include but are not limited to: the maximum weight of the crane for lifting m, the maximum diameter of the cold-rolled coil, the maximum diameter of the hot-rolled coil R, the maximum rolling length of the hot-rolled thin specification l, the maximum slab length of the heating furnace, the minimum length of the steelmaking cut length, and the maximum billet length limited by the heating furnace loading capacity is L0.
[0055] The maximum weight of the crane hoisting is m, and the maximum length of the billet is limited to L1 = m / μ1 / h0 / ρ / w2. The corresponding maximum length of the billet is calculated based on the maximum weight of the crane hoisting in other processes; where ρ is the density of steel;
[0056] The maximum hot rolling coiling diameter R limits the maximum billet length L2 = π*(R2-r2) / 4*w1*ρ / w2 / h0 / ρ / μ1; where r is the inner diameter of the hot rolling coil. The corresponding maximum billet length is calculated based on the maximum coiling diameter of other processes;
[0057] The maximum rolling length of hot-rolled thin gauge is l, and the limit billet length is L3 = h1*w1*l / w2 / h0 / μ1;
[0058] The minimum value of all the ingot lengths calculated above is taken to determine the maximum ingot length L, which is determined by comprehensively considering the constraints of each process, L=min{L0, L1, L2, L3, ...}.
[0059] 7. Calculate the maximum ingot weight weight, weight = ρ*L*W2*h0. The calculation result is directly applied to the ingot quality design to obtain the maximum ingot weight within the range allowed by the equipment capacity.
[0060] like Figure 1 As shown, taking a common cold-rolled DC03 steel grade 0.8*1250mm specification order as an example, a detailed explanation is given.
[0061] 1. Get the basic order information, enter the cold-rolled product category code GHC for this order; enter the cold-rolled product steel grade code GHC03 for the order; enter the cold-rolled product strip thickness height = 0.8mm; enter the cold-rolled product strip width width = 1250mm; enter the cold-rolled product strip width tolerance a = 5mm; enter the cold-rolled product trimming process required by the order as finished product trimming process.
[0062] 2. Determine that the company's billet thickness h0 = 230mm.
[0063] 3. Determine the thickness of the hot-rolled incoming material and calculate the thickness of the hot-rolled incoming strip h1=2.75mm through the quality design comparison table.
[0064] 4. Confirm the billet process loss data according to the basic information of the order, and check and confirm the hot-rolled thickness of 2.75mm, the acid-rolled thickness of 0.5mm, the continuous annealing thickness of 0.5mm, and the continuous annealing process trimming width of 1250mm through the standard yield rate comparison table of steel types and specifications in each process. The finished strip steel undergoes hot rolling, acid rolling and continuous annealing processes, with yield rates of 99.5%, 99.5% and 97% respectively.
[0065] 5. Determine the width of the ingot. According to the finished product width tolerance a=5mm, the cold rolling process disc shear edge limit b=14mm, the narrowing amount in the annealing furnace c=3mm, and the hot rolling width tolerance d=10mm, determine the width w1=1250+5+14+3+10=1282mm of the cold rolled base material hot rolled coil.
[0066] Width range mm Billet width mm [900,1150) 1190 [1150,1250) 1300 [1250,1350) 1400 [1350,1500) 1550 [1500,1600) 1650 [1600,1820) 1850 [1820,1880] 1880
[0067] According to the hot rolling fixed width capability, the comparison table of conventional billet widths in different width ranges of the enterprise is shown in the table above. The width of 1282mm corresponds to the range of [1250,1350), corresponding to the billet width w2=1400mm.
[0068] 6. Taking into account the constraints of each process, determine the maximum length of the ingot. On the basis of determining the width of the ingot w2 = 1400mm, take into account the constraints of each process, determine the maximum length of the ingot.
[0069] The maximum billet length limited by the heating furnace loading capacity is L0=11.5m.
[0070] The maximum weight of crane hoisting is m=40t, and the maximum billet length is limited to L1=m / μ1 / h0 / ρ / w2=15.9m.
[0071] The maximum diameter of hot rolled coiling is R=2000mm, the inner diameter of hot rolled coil is r=762mm, and the maximum billet length is limited to L2=π*(R2-r2) / 4*w1*ρ / w2 / h0 / ρ / μ1=10.75m.
[0072] The maximum rolling length of hot rolling 2.5mm and thin specifications is l=1160m, and the limited billet length is L3=h1*w1*l / w2 / h0 / μ1=12.76m.
[0073] The minimum value of all the ingot lengths calculated above is taken to determine the maximum ingot length L by comprehensively considering the constraints of each process, that is, L=min{L0,L1,L2,L3}=min{11.5,15.9,10.75,12.76}=10.75m.
[0074] The main limiting factor for the weight of the ingot is the maximum diameter of the hot rolling coiling R=2000mm. If the mass of the ingot is further increased, a production accident may occur in which the hot rolling coiling diameter exceeds 20000mm and the coil cannot be unloaded normally.
[0075] 7. Calculate the maximized ingot weight weight, weight = ρ*L*W2*h0 = 27.16 tons.
[0076] The above calculation results are directly applied to the quality design of the ingot to obtain the maximum ingot weight within the range allowed by the equipment capacity. The unit width weight of the hot-rolled incoming material of this coil reaches 21.17kg / mm (the conventional unit weight range is 18-22kg / mm), which is at a relatively high level and is conducive to improving economic and technical indicators such as rolling efficiency and yield rate.
[0077] The present invention is not limited to the above-mentioned implementation modes, and anyone should be aware of the structural changes made under the enlightenment of the present invention, and all those having the same or similar technical solutions as the present invention fall within the protection scope of the present invention.
[0078] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.
Claims
1. A method for maximizing the weight of cold-rolled base material casting, characterized in that: The following steps are involved: S1. Obtain basic order information; S2, determine the thickness of the ingot h0 = 230 mm; S3, determine the thickness h1 of the hot-rolled material; S4. Confirm the billet process loss data according to the order basic information. The yield rate of the strip after the hot rolling process is μ1, the yield rate of the pickling process is μ2, and the yield rate of the continuous annealing process is μ3; S5. Determine the width of the ingot: determine the width w1 of the cold-rolled base material hot-rolled coil according to the finished product width tolerance a, the cold-rolling process disc shear edge limit b, the annealing furnace narrowing amount c, and the hot-rolling width tolerance d; design the conventional ingot width w2 of different width ranges according to the hot-rolling width setting capacity, w2>w1; S6. Taking into account the constraints of each process, determine the maximum length L of the ingot; S7. Calculate the maximized billet weight weight, weight = ρ*L*W2*h0. The calculation result is directly applied to the billet quality design to obtain the maximized billet weight within the range allowed by the equipment capacity.
2. The method for maximizing the weight of cold-rolled base material casting according to claim 1, characterized in that: The basic order information in step S1 includes but is not limited to the cold-rolled product category code, steel grade code, strip thickness height, strip width width, strip width tolerance a and trimming process.
3. The method for maximizing the weight of cold-rolled base material casting according to claim 2, characterized in that: The hot-rolled incoming material thickness h1 in step S3 is calculated based on the cold-rolled product category code, strip thickness and strip width through a quality design comparison table.
4. The method for maximizing the weight of cold-rolled base material casting according to claim 1, characterized in that: The billet process loss data in step S4 is obtained by querying and confirming the yield rate data of the finished strip steel after each process through the standard yield rate comparison table of steel grade specifications in each process.
5. The method for maximizing the weight of cold-rolled base material casting according to claim 2, characterized in that: The width w1 of the hot rolled coil of the cold rolled base material in step S5 includes: Pickled and cold hardened uncut roll w1 = width + a + d; Pickled and cold-hardened trimmed roll w1 = width + a + b + d; Normal cold-dip and galvanized uncut coils w1 = width + a + c + d; Normal cold-dip and galvanized trimmed coils w1=width+a+b+c+d.
6. The method for maximizing the weight of cold-rolled base material casting according to claim 1, characterized in that: The maximum ingot length L in step S6 is determined on the basis of determining the ingot width w2, and then comprehensively considering the constraints of each process. The links that restrict the ingot length of the cold-rolled product include but are not limited to: the maximum weight of the crane m, the maximum diameter of the cold-rolled coiling, the maximum diameter of the hot-rolled coiling R, the maximum rolling length of the hot-rolled thin specification l, the maximum slab length of the heating furnace, the minimum length of the steelmaking cut-to-length, and the maximum ingot length limited by the heating furnace loading capacity is L0.
7. The method for maximizing the weight of cold-rolled base material casting according to claim 6, characterized in that: The maximum weight of the crane hoisting is m, and the maximum billet length is limited to L1=m / μ1 / h0 / ρ / w2. The corresponding maximum billet length is calculated based on the maximum weight of the crane hoisting in other processes; where ρ is the density of steel; The maximum hot rolling coiling diameter R limits the maximum billet length L2 = π*(R2-r2) / 4*w1*ρ / w2 / h0 / ρ / μ1; where r is the inner diameter of the hot rolling coil. The corresponding maximum billet length is calculated based on the maximum coiling diameter of other processes; The maximum rolling length of hot-rolled thin gauge is l, and the limit billet length is L3 = h1*w1*l / w2 / h0 / μ1; The minimum value of all the ingot lengths calculated above is taken to determine the maximum ingot length L, which is determined by comprehensively considering the constraints of each process, L=min{L0, L1, L2, L3, ...}.