A method for assembling slab panels

Abstract

The present invention belongs to the field of slab assembly design and relates to a slab assembly method. The slab assembly method for non-fixed-length order contracts changes the previous non-fixed-length assembly thinking. The length value of the rolling length is calculated based on the maximum billet size that can enter the furnace, and then the billet length of the slab is reversely calculated after rounding off the minimum multiple and the product length to achieve the maximum slab assembly design, ultimately achieving the purpose of increasing production and maximizing yield. The present invention also provides an assembly design for fixed-length + non-fixed-length contracts and five types of fixed-length assembly rolling modes, which can further effectively improve the yield rate, reduce short-rolled excess material, and reduce assembly carryout.

Description

Technical Field

[0001] The invention belongs to the field of slab assembly design and relates to a slab assembly method. Background Art

[0002] Hot-rolled thick plates are widely used in industries such as infrastructure construction, the defense industry, and engineering machinery. This breadth of industries means that production orders for medium and thick plate products are characterized by multiple varieties, specifications, small batches, and personalization. This highlights the contradiction between meeting the market's personalized customization needs and the company's large-scale production. The production of hot-rolled thick plates first requires plate assembly design tailored to the production order. This not only builds a "bridge" between production and customer needs, but also forms the basis for production planning. The degree of optimization of plate assembly design is a prerequisite for companies to achieve large-scale, low-cost production and a key factor in enabling hot-rolled thick plate companies to quickly respond to the market and enhance their core competitiveness.

[0003] Typically, steel mills produce approximately 80% of their products under contract for non-fixed lengths, while the remainder is under contract for fixed lengths. A non-fixed length contract involves a range of widths or lengths, with all thick plates within that range meeting acceptable specifications. For example, 20*2000 to 2500*8000 to 12000 are acceptable. Non-fixed lengths typically have a fixed width and a length range, whereas fixed-length contracts typically have fixed widths, lengths, and thicknesses, such as 20*2000*8000. Traditionally, plate assembly design for non-fixed length contracts involved selecting a common size within the length range. However, this method prevented the production of the blanks from reaching the maximum furnace size or weight, limiting capacity expansion.

[0004] Since non-fixed-length slab assembly is to take a common size within the length range for assembly, it not only cannot achieve the maximum slab feeding size and maximum billet weight, but its yield also limits the improvement of production capacity. Therefore, it is urgently needed to propose a slab assembly method for non-fixed-length order contracts. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a slab assembly method for non-fixed-size order contracts, which changes the previous non-fixed-size assembly thinking, calculates the length of the rolling length based on the maximum billet size that can enter the furnace, and then reversely calculates the billet length of the slab after rounding off the minimum multiple and the product length to achieve the maximum slab assembly design, and ultimately achieves the purpose of increasing production and maximizing yield.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A slab assembly method includes a slab assembly design for a non-fixed-length order contract, specifically comprising the following steps:

[0008] Step 1. Set the first billet length according to the maximum billet size that can be fed into the furnace, and pre-calculate the first rolling length after rolling according to the first billet length in combination with the product thickness and product width specified in the order contract:

[0009] The first rolling length = (the first billet length - cutting seam) * unit weight of cross-section * burning loss / ((product thickness + lower limit value of product thickness tolerance + thickness allowance) * (product width + width allowance) * steel plate density) - length allowance;

[0010] Step 2. Calculate the product length in the non-fixed-length order contract according to the first rolling length:

[0011] The minimum multiple range = rolling length / upper and lower limit values of the product length range specified in the non-fixed-length order contract, and the minimum multiple is the smallest integer in the minimum multiple range;

[0012] The first product length = the first rolling length / the minimum multiple, and round up the first product length in 50mm increments to obtain the second product length;

[0013] Then, calculate the second rolling length and the second billet length by back-calculating according to the minimum multiple and the second product length. Among them, the second rolling length = the second product length * the minimum multiple, and the second billet length = (the second rolling length + length allowance) * ((product thickness + lower limit value of product thickness tolerance + thickness allowance) * (product width + width allowance) * steel plate density) / unit weight of cross-section / burning loss + cutting seam, and use the second billet length as the actual billet length for rolling to achieve the maximum plate surface and the maximum yield rate of the slab.

[0014] Furthermore, the order quantity of the non-fixed-length order contract is: order quantity = order volume / (finished product thickness * finished product width * finished product length * 7.85 / 1000000000), the number of steel plates = order quantity / the minimum multiple, and the first number of steel plates obtained by rounding down the number of steel plates, and the billet length is the second billet length;

[0015] Among them, for the order quantity that is not enough to form a plate with the minimum multiple, calculate the third rolling length and the third billet length according to the third rolling length = the second product length * the minimum multiple * (the number of steel plates - the first number of steel plates), and the third billet length = (the third rolling length + length allowance) * ((product thickness + lower limit value of product thickness tolerance + thickness allowance) * (product width + width allowance) * steel plate density) / unit weight of cross-section / burning loss + cutting seam, and design the plate for the order quantity that is not enough to form a plate with the minimum multiple according to the third billet length.

[0016] Furthermore, it also includes the design of assembling plates for non-standard order contracts + standard order contracts, which specifically includes the following steps: rolling with the length of the second blank as the actual blank length, and conducting the design of assembling plates for standard + non-standard with the second rolling length, so that the length of the standard product * multiple number of lengths + the length of the non-standard product * multiple number of lengths = the second rolling length, and the multiple number of lengths of the non-standard product is greater than or equal to 1.

[0017] Furthermore, it also includes the design of assembling plates for standard order contracts, including the first rolling mode, the second rolling mode, the third rolling mode, the fourth rolling mode, and the fifth rolling mode; among them, the first rolling mode conducts the assembling of plates for two standard order contracts with the same steel type but different lengths and the same width in the width direction, the combined width is 2 times the width of the product of one of the standard contract products, and the combined length is the sum of 2 times the lengths of the products of the two standard contracts respectively;

[0018] The second rolling mode conducts the assembling of plates for two standard order contracts with the same steel type but different widths and the same length in the length direction, the combined width is 2 times the maximum product width of the two standard contracts, and the combined length is the sum of 2 times the lengths of the products of the two standard contracts respectively;

[0019] The third rolling mode conducts the assembling of plates for two standard order contracts with the same steel type but different widths and the same length in the width direction, the combined width is 2 times the maximum product width of the two standard contracts, and the combined length is the sum of 2 times the lengths of the products of the two standard contracts respectively;

[0020] The fourth rolling mode conducts the assembling of plates for five standard order contracts with different widths and lengths in the width direction, different widths and the same length in the length direction, and the same steel type, the combined width is 2 times the maximum product width of the five standard contracts, and the combined length is the sum of the lengths of the first three products in descending order of the product lengths of the five standard contracts;

[0021] The fifth rolling mode conducts the assembling of plates for four standard order contracts with different widths and lengths in the width direction, different widths and the same length in the length direction, and the same steel type, the combined width is the maximum product width of the four standard contracts, and the combined length is 4 times the maximum product length of the four standard contracts.

[0022] Furthermore, in the first rolling mode, the length difference is 0 - 100 mm.

[0023] Furthermore, in the second rolling mode, the width difference is 0 - 50 mm.

[0024] Furthermore, in the third rolling mode, the width difference is 0 - 50 mm.

[0025] Furthermore, in the fourth rolling mode, the width difference in the width direction is 0-50 mm, the length difference is 0-100 mm, and the width difference in the length direction is 0-50 mm.

[0026] Furthermore, in the fifth rolling mode, the width difference in the width direction is 0-50 mm, the length difference is 0-100 mm, and the width difference in the length direction is 0-50 mm.

[0027] The beneficial effects of the present invention are:

[0028] The present invention proposes a slab assembly method, wherein the slab assembly method for a non-fixed-length order contract calculates its first rolling length by combining the maximum slab size that can enter the furnace with the product thickness and product width specified in the non-fixed-length contract, and calculates the minimum multiple and product length based on the first rolling length combined with the product length range specified in the non-fixed-length contract, rounds the minimum multiple and product length by the method specified in the present invention, and reversely infers the actual slab length by combining the rounded minimum multiple and product length with the calculation formula of the invention, thereby calculating the maximum slab size entering the furnace under the product specifications required by the non-fixed-length order contract and with the maximum slab yield, thereby achieving maximum utilization of the slab, and reducing the corresponding proportion of the sheared head and tail of the steel plate, which is conducive to improving the yield rate.

[0029] Secondly, the present invention also provides a plate assembly design of fixed length + non-fixed length contract and five fixed length plate assembly rolling modes, which can further effectively improve the yield rate, reduce the short-rolled excess material, and reduce the plate assembly carryout.

[0030] Other advantages, objects, and features of the present invention will be described in part in the following description and, in part, will be apparent to those skilled in the art upon examination of the following description or may be learned from practice of the present invention. The objects and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0032] Figure 1 This is a schematic diagram of the first rolling mode in the embodiment;

[0033] Figure 2 Schematic diagram of the second rolling mode in the embodiment;

[0034] Figure 3 This is a schematic diagram of the third rolling mode in the embodiment;

[0035] Figure 4Schematic diagram of the fourth rolling mode in the embodiment;

[0036] Figure 5 Schematic diagram of the fifth rolling mode in the embodiment. Specific implementation manners

[0037] The following uses specific specific examples to illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0038] Among them, the drawings are only for illustrative purposes, showing only schematic diagrams, not physical diagrams, and cannot be understood as a limitation to the present invention; in order to better illustrate the embodiments of the present invention, some components in the drawings will be omitted, enlarged or reduced, which does not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0039] In the drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation to the present invention. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0040] A method for assembling slab groups, including the design of assembling non-standard order contracts, which specifically includes the following steps:

[0041] Step 1. Set the first billet length according to the maximum billet size that can enter the furnace, and pre-calculate the first rolling length after rolling according to the first billet length in combination with the product thickness and product width specified in the order contract:

[0042] The first rolling length = (the first billet length - the cutting seam) * the single weight of the cross-section * the burning loss / ((the product thickness + the lower limit of the product thickness tolerance + the thickness allowance) * (the product width + the width allowance) * the steel plate density) - the length allowance;

[0043] Step 2. Calculate the product length in the non-standard-length order contract according to the first rolling length:

[0044] The minimum multiple-length range = the rolling length / the upper and lower limit values of the product length range specified in the non-standard-length order contract, and the minimum multiple-length is the smallest integer in the minimum multiple-length range;

[0045] The first product length = the first rolling length / the minimum multiple-length, and the second product length is obtained by rounding up the first product length in 50 mm increments;

[0046] Then, calculate the second rolling length and the second blank length by back-calculating according to the minimum multiple-length and the second product length. Among them, the second rolling length = the second product length * the minimum multiple-length, and the second blank length = (the second rolling length + the length allowance) * ((the product thickness + the lower limit value of the product thickness tolerance + the thickness allowance) * (the product width + the width allowance) * the steel plate density) / the sectional single weight / the burning loss + the cutting seam, and use the second blank length as the actual blank length for rolling to achieve the maximum plate surface and the maximum yield rate of the slab.

[0047] Furthermore, the order quantity of the non-standard-length order contract is: the order quantity = the order volume / (the finished product thickness * the finished product width * the finished product length * 7.85 / 1000000000), the number of steel plates = the order quantity / the minimum multiple-length, and the first number of steel plates is the integer obtained by rounding down the number of steel plates, and the blank length is the second blank length;

[0048] Among them, for the order quantity that is not enough to form a plate with the minimum multiple-length, calculate the third rolling length and the third blank length according to the third rolling length = the second product length * the minimum multiple-length * (the number of steel plates - the first number of steel plates), and the third blank length = (the third rolling length + the length allowance) * ((the product thickness + the lower limit value of the product thickness tolerance + the thickness allowance) * (the product width + the width allowance) * the steel plate density) / the sectional single weight / the burning loss + the cutting seam, and design the plate for the order quantity that is not enough to form a plate with the minimum multiple-length according to the third blank length.

[0049] The present invention also includes the plate design for the non-standard-length order contract + the fixed-length order contract, which specifically includes the following steps: use the second blank length as the actual blank length for rolling, and perform the fixed-length + non-standard-length plate design with the second rolling length, so that the fixed-length product length * the multiple-length + the non-standard-length product length * the multiple-length = the second rolling length, and the multiple-length of the non-standard-length product length is greater than or equal to 1.

[0050] The present invention can ensure the qualified fixed-length steel plates and improve the yield rate of non-fixed-length plates by adding a "fixed-length + non-fixed-length" plate assembly mode. Since the non-fixed-length length is a range value, the length of the fixed-length plate can be compensated in the event that the fixed-length plate is short, which can greatly reduce the situation of fixed-length being rolled short or thinned. The yield rate of non-fixed-length plates can be improved when there is excess length in the fixed-length plate. The "fixed-length + non-fixed-length" plate assembly is designed according to the maximum non-fixed-length plate surface size, achieving the optimal combination of fixed-length contract * multiples + non-fixed-length contract * multiples.

[0051] The present invention also includes a plate assembly design for a fixed-length order contract, which includes a first set of rolling modes, a second set of rolling modes, a third set of rolling modes, a fourth set of rolling modes, and a fifth set of rolling modes; wherein the first set of rolling modes is used to assemble plates for two fixed-length order contracts with the same width but different lengths and the same steel grade, the combined width being twice the width of one of the fixed-length contract products, and the combined length being twice the sum of the lengths of the two fixed-length contract products;

[0052] The second rolling mode is to combine plates for two fixed-length order contracts with different widths and the same length in the longitudinal direction and the same steel grade, with the combined width being twice the maximum product width in the two fixed-length contracts and the combined length being twice the sum of the lengths of the products in the two fixed-length contracts;

[0053] The third rolling mode is to combine plates for two fixed-length order contracts with different widths and the same length in the width direction and the same steel grade, with the combined width being twice the maximum product width in the two fixed-length contracts, and the combined length being twice the sum of the lengths of the products in the two fixed-length contracts;

[0054] The fourth rolling mode is to group plates for five fixed-length order contracts with different widths and lengths in the width direction and different widths and the same length in the length direction and the same steel grade, wherein the combined width is twice the maximum product width in the five-piece fixed-length contract, and the combined length is the sum of the lengths of the first three products in the five-piece fixed-length contract, sorted in descending order of length.

[0055] The fifth rolling mode is to assemble plates for four fixed-length order contracts with different widths and lengths in the width direction and different widths and same lengths in the length direction and the same steel grade. The combined width is the maximum product width in the four-piece fixed-length contract, and the combined length is 4 times the maximum product length in the four-piece fixed-length contract.

[0056] Preferably, the length difference in the first rolling mode is 0 to 100 mm. The width difference in the second rolling mode is 0 to 50 mm. The width difference in the third rolling mode is 0 to 50 mm. In the fourth rolling mode, the width difference in the width direction is 0 to 50 mm, the length difference is 0 to 100 mm, and the width difference in the length direction is 0 to 50 mm. In the fifth rolling mode, the width difference in the width direction is 0 to 50 mm, the length difference is 0 to 100 mm, and the width difference in the length direction is 0 to 50 mm.

[0057] Example 1

[0058] Non-standard length contract: Steel grade Q355B, thickness 20 mm, width 2000 mm, length 8000 - 12000 mm, order quantity 200 tons; among them, the maximum billet length that can enter the furnace = 3800 mm, cutting seam = 10 mm, single billet weight = 4808 kg, burning loss = 0.99, lower limit of thickness tolerance = -0.75 mm, thickness allowance = 0.5 mm, width allowance = 120 mm, length allowance = 900 mm. Substituting into the formula, the calculation results are as follows: <>

[0059] The first rolling length = (3800 - 10) * 4808 * 0.99 * 1000 / ((20 - 0.75 + 0.55) / (2000 + 120) / 7.85) - 900 = 41190 mm

[0060] The minimum number of multiple lengths = 41190 / 12000 ≈ 3.4, the maximum number of multiple lengths = 41190 / 8000 ≈ 5.1. So the minimum number of multiple lengths takes the smallest integer 4 between 3.4 and 5.1.

[0061] The first product length = 41190 / 4 = 10297.5 mm. Rounding up to the nearest 50 mm, the second product length is 10250 mm.

[0062] The second rolling length = 10250 * 4 = 41000 mm, the second billet length = (20 - 0.75 + 0.5) * (2000 + 120) * (10250 * 4 + 900) * 7.85 / 0.99 / 4808 / 1000 + 10 = 2905 mm.

[0063] That is, the actual billet length is 2905 mm, the rolling length = 4100 mm, the minimum number of multiple lengths = 4, and the product length = 10250 mm. So the number of ordered pieces = order quantity / (product thickness * product width * product length * 7.85 / 1000000000) = 200 / (20 * 2000 * 10250 * 7.85 / 1000000000) = 62.14;

[0064] 62.14 pieces of non-standard-length steel plates arranged in 4-fold lengths can form 15 billets with a billet length of 2905 mm, and the remaining 2.14 pieces less than 4 pieces form a separate billet.

[0065] The third rolling length = the second product length * the minimum multiple length * (the number of steel plate pieces - the number of the first steel plate pieces), and the third billet length = (the third rolling length + the length allowance) * ((the product thickness + the lower limit of the product thickness tolerance + the thickness allowance) * (the product width + the width allowance) * the steel density) / the sectional unit weight / the burning loss + the cutting seam. The calculated third rolling length and third billet length are 35100 and 2495 respectively.

[0066] Since the remaining pieces are less than the minimum billet, one 4-fold length can be withdrawn from the previous ones and recombined with the two pieces at the back to form a 3-fold length grouping method. The second product length = 11700 mm.

[0067] The third rolling length = 11700 * 3 = 35100 mm, and the third billet length = (35100 + 900) * ((20 - 0.75 + 0.5) * (2000 + 120) * 7.85) / 4808 / 0.99 / 1000 + 10 = 2495 mm.

[0068] There are a total of 16 billets in this embodiment. Among them, 14 billets are billets with a billet length of 2905 mm arranged in 4-fold lengths, and the remaining 6 billets are supplementary billets with a billet length of 2495 mm. This embodiment changes the previous non-standard-length grouping thinking, calculates the length value of the rolling length based on the maximum billet size that can enter the furnace, and then inversely calculates the billet length of the billet after rounding the minimum multiple length and the product length, so as to achieve the maximum billet grouping design, and finally achieve the purpose of increasing the output and the maximum yield.

[0069] Example 2:

[0070] Fixed-length contract: Steel grade Q355B, thickness 20 mm, width 2000 mm, length 8000 mm, order quantity 12 pieces;

[0071] Non-fixed-length contract: Steel grade Q355B, thickness 20 mm, width 2000 mm, length 8000 - 12000 mm, order quantity 50 tons. Among them, the maximum billet length that can enter the furnace = 3800 mm, cutting seam = 10 mm, billet unit weight = 4808 kg, burning loss = 0.99, lower limit of thickness tolerance = -0.75 mm, thickness allowance = 0.5 mm, width allowance = 120 mm, length allowance = 900 mm. Substituting into the formula, the calculation results are as follows:

[0072] First rolling length = (3800 - 10) * 4808 * 0.99 * 1000 / ((20 - 0.75 + 0.55) / (2000 + 120) / 7.85) - 900 = 41190mm

[0073] The minimum number of multiple lengths = 41190 / 12000 ≈ 3.4, the maximum number of multiple lengths = 41190 / 8000 ≈ 5.1. So the minimum integer of the range from 3.4 to 5.1 is taken as 4 for the minimum number of multiple lengths.

[0074] First product length = 41190 / 4 = 10297.5mm. Rounding up to the nearest 50mm gives the second product length as 10250mm.

[0075] The second rolling length = 10250 * 4 = 41000mm, the second blank length = (20 - 0.75 + 0.5) * (2000 + 120) * (10250 * 4 + 900) * 7.85 / 0.99 / 4808 / 1000 + 10 = 2905mm.

[0076] According to the above formulas, the following results are calculated:

[0077] Rolling length = 41000mm. It can be a combination of 3 fixed - length pieces + 2 non - fixed - length pieces, 8000 * 3 + 8500 * 2 = 41000mm; or a combination of 4 fixed - length pieces + 1 non - fixed - length piece, 8000 * 4 + 9000 * 1 = 41000mm. Both can achieve the maximum plate area.

[0078] Option 1: The order quantity of non - fixed - length contracts = Order quantity / (Product thickness * Product width * Product length * 7.85 / 1000000000) = 50 / (20 * 2000 * 9000 * 7.85 / 1000000000) = 18.73;

[0079] Option 2: The order quantity of non - fixed - length contracts = Order quantity / (Product thickness * Product width * Product length * 7.85 / 1000000000) = 50 / (20 * 2000 * 9000 * 7.85 / 1000000000) = 17.69.

[0080] Since the order quantity of fixed - length contracts is only 12 pieces, Option 1 is adopted in this embodiment, that is, a combination of 3 fixed - length pieces + 2 non - fixed - length pieces forms a slab with a rolling length of 41000mm. Thus, 12 fixed - length thick plates and 8 non - fixed - length thick plates form 4 slabs. The order quantity of the remaining 10.73 non - fixed - length thick plates is 29.8 tons. Using 10250mm as the product length and forming a 41000mm slab with the minimum number of multiple lengths of 4, the order quantity = 29.8 / (20 * 2000 * 10250 * 7.85 / 1000000000) = 9.25.

[0081] Arranging 9.25 pieces of non-standard-length steel plates in quadruple lengths can form 2 slabs with a blank length of 2905 mm, and the remaining 1.25 pieces less than 4 pieces form a separate slab.

[0082] Example 3:

[0083] In this example, the first rolling mode is adopted to group plates for the following order contracts:

[0084] Contract 1: Steel grade Q355B, thickness 20 mm, width 1500 mm, length 9000 mm, number of ordered pieces 4;

[0085] Contract 2: Steel grade Q355B, thickness 20 mm, width 1500 mm, length 8000 mm, number of ordered pieces 4.

[0086] As Figure 1 shown, according to the first rolling mode for plate grouping, the combined width is 1500 * 2 = 3000 mm, and the combined length is 9000 * 2 + 8000 * 2 = 34000 mm, and the parameters of the furnace inlet slab are back-calculated based on these parameters.

[0087] Example 4

[0088] In this example, the second rolling mode is adopted to group plates for the following order contracts:

[0089] Contract 1: Steel grade Q355B, thickness 20 mm, width 1550 mm, length 9000 mm, number of ordered pieces 4;

[0090] Contract 2: Steel grade Q355B, thickness 20 mm, width 1500 mm, length 8000 mm, number of ordered pieces 4.

[0091] As Figure 2 shown, according to the second rolling mode for plate grouping, the combined width is taken as 1550 * 2 = 3100 mm, and the combined length is 9000 * 2 + 8000 * 2 = 34000 mm, and the parameters of the furnace inlet slab are back-calculated based on these parameters.

[0092] Example 5

[0093] In this example, the third rolling mode is adopted to group plates for the following order contracts:

[0094] Contract 1: Steel grade Q355B, thickness 20 mm, width 1550 mm, length 9000 mm, number of ordered pieces 4;

[0095] Contract 2: Steel grade Q355B, thickness 20 mm, width 1500 mm, length 9000 mm, number of ordered pieces 4.

[0096] As Figure 3 shown, according to the third rolling mode, the plates are grouped, the combined width is 1550 + 1500 = 3050 mm, the combined length is 9000 * 2 + 9000 * 2 = 36000 mm, and the parameters of the slab entering the furnace are calculated backward based on these parameters.

[0097] Example 6:

[0098] In this example, the fourth rolling mode is adopted to group the following order contracts:

[0099] Contract 1: Steel grade Q355B, thickness 20 mm, width 1550 mm, length 9000 mm, number of ordered pieces 2;

[0100] Contract 2: Steel grade Q355B, thickness 20 mm, width 1530 mm, length 9000 mm, number of ordered pieces 1.

[0101] Contract 3: Steel grade Q355B, thickness 20 mm, width 1530 mm, length 8000 mm, number of ordered pieces 1.

[0102] Contract 4: Steel grade Q355B, thickness 20 mm, width 1500 mm, length 8000 mm, number of ordered pieces 1.

[0103] Contract 5: Steel grade Q355B, thickness 20 mm, width 1500 mm, length 9000 mm, number of ordered pieces 1.

[0104] As Figure 4 shown, according to the fourth rolling mode, the plates are grouped, the combined width is 1550 * 2 = 3100 mm, the combined length is 9000 + 9000 + 9000 = 27000 mm, and the parameters of the slab entering the furnace are calculated backward based on these parameters.

[0105] Example 7

[0106] In this example, the fifth rolling mode is adopted to group the following order contracts:

[0107] Contract 1: Steel grade Q355B, thickness 20 mm, width 2000 mm, length 9000 mm, number of ordered pieces 1;

[0108] Contract 2: Steel grade Q355B, thickness 20 mm, width 2000 mm, length 9000 mm, number of ordered pieces 1.

[0109] Contract 3: Steel grade Q355B, thickness 20 mm, width 1980 mm, length 9000 mm, number of ordered pieces 1.

[0110] Contract 4: Steel grade Q355B, thickness 20mm, width 1960mm, length 9000mm, order quantity 1 piece.

[0111] As Figure 5 shown, according to the fifth rolling mode, the plates are grouped, the combined width is taken as 2000mm, the combined length is 9000 * 4 = 36000mm, and the parameters of the slab entering the furnace are inversely calculated based on these parameters.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the present technical solution, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A method for assembling slab groups, characterized in that, Including the design of assembling plates for non-standard-length order contracts, which specifically includes the following steps: Step 1. Set the first billet length according to the maximum billet size that can enter the furnace, and based on the first billet length, combined with the product thickness and product width specified in the order contract, pre-calculate the first rolling length after rolling: The first rolling length = (the first billet length - the cutting seam) * the single weight of the cross-section * the burning loss / ((the product thickness + the lower limit value of the product thickness tolerance + the thickness allowance) * (the product width + the width allowance) * the steel plate density) - the length allowance; Step 2. Calculate the product length in the non-standard-length order contract according to the first rolling length: The minimum multiple range = the rolling length / the upper and lower limit values of the product length range specified in the non-standard-length order contract, and the minimum multiple is the smallest integer in the minimum multiple range; The first product length = the first rolling length / the minimum multiple, and round up the first product length in increments of 50 mm to obtain the second product length; Then, calculate the second rolling length and the second billet length by back-calculating based on the minimum multiple and the second product length. Among them, the second rolling length = the second product length * the minimum multiple, and the second billet length = (the second rolling length + the length allowance) * ((the product thickness + the lower limit value of the product thickness tolerance + the thickness allowance) * (the product width + the width allowance) * the steel plate density) / the single weight of the cross-section / the burning loss + the cutting seam, and use the second billet length as the actual billet length for rolling to achieve the maximum plate surface and the maximum yield rate of the slab.

2. The slab assembling method according to claim 1, characterized in that: The order quantity of the non-standard-length order contract is: the order quantity = the order volume / (the finished product thickness * the finished product width * the finished product length * 7.85 / 1000000000), the number of steel plates = the order quantity / the minimum multiple, and take the integer downwards of the number of steel plates as the first number of steel plates, and the billet length is the second billet length; Among them, for the order quantity that is not enough to form an assembled plate with the minimum multiple, calculate the third rolling length and the third billet length according to the third rolling length = the second product length * the minimum multiple * (the number of steel plates - the first number of steel plates), and the third billet length = (the third rolling length + the length allowance) * ((the product thickness + the lower limit value of the product thickness tolerance + the thickness allowance) * (the product width + the width allowance) * the steel plate density) / the single weight of the cross-section / the burning loss + the cutting seam, and design the assembled plate for the order quantity that is not enough to form an assembled plate with the minimum multiple according to the third billet length.

3. The slab grouping method according to claim 1, characterized in that: It also includes the design of assembling plates for non-standard-length order contracts + fixed-length order contracts, which specifically includes the following steps: Use the second billet length as the actual billet length for rolling, and conduct the design of assembling fixed-length and non-standard-length plates with the second rolling length, so that the fixed-length product length * the multiple in the fixed-length order contract + the non-standard-length product length * the multiple in the non-standard-length order contract = the second rolling length, and the multiple of the non-standard-length product length is greater than or equal to 1.

4. A method for assembling slab groups according to claim 1, characterized in that: It also includes sizing order contract panel design, including the first rolling mode, the second rolling mode, the third rolling mode, the fourth rolling mode, and the fifth rolling mode; among them, the first rolling mode is for sizing order contracts with the same steel type but different lengths and the same width in the width direction. The combined width is twice the width of one of the sizing contract products, and the combined length is the sum of twice the lengths of the two sizing contract products respectively; The second rolling mode is for sizing order contracts with the same steel type but different widths and the same length in the length direction. The combined width is twice the maximum product width of the two sizing contracts, and the combined length is the sum of twice the lengths of the two sizing contract products respectively; The third rolling mode is for sizing order contracts with the same steel type but different widths and the same length in the width direction. The combined width is twice the maximum product width of the two sizing contracts, and the combined length is the sum of twice the lengths of the two sizing contract products respectively; The fourth rolling mode is for sizing order contracts with different widths and lengths in the width direction, different widths and the same length in the length direction, and the same steel type. The combined width is twice the maximum product width of the five sizing contracts, and the combined length is the sum of the lengths of the first three products sorted from largest to smallest in the product lengths of the five sizing contracts; The fifth rolling mode is for sizing order contracts with different widths and lengths in the width direction, different widths and the same length in the length direction, and the same steel type. The combined width is the maximum product width of the four sizing contracts, and the combined length is four times the maximum product length of the four sizing contracts.

5. A slab grouping method according to claim 4, characterized in that: In the first rolling mode, the length difference is 0 - 100 mm.

6. A slab grouping method according to claim 4, characterized in that: In the second rolling mode, the width difference is 0 - 50 mm.

7. A slab grouping method according to claim 4, characterized in that: In the third rolling mode, the width difference is 0 - 50 mm.

8. A method for assembling slab groups according to claim 4, characterized in that: In the fourth rolling mode, the width difference in the width direction is 0 - 50 mm, the length difference is 0 - 100 mm, and the width difference in the length direction is 0 - 50 mm.

9. A method for assembling slab groups according to claim 4, characterized in that: In the fifth rolling mode, the width difference in the width direction is 0 - 50 mm, the length difference is 0 - 100 mm, and the width difference in the length direction is 0 - 50 mm.

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