A method for determining the optimal multiple length in steel rolling shearing

Abstract

The present invention discloses a method for determining the optimal multiple of steel rolling shearing, which comprises the following steps: calculating the length a of finished products of different specifications and fixed lengths according to the weight of the steel billet; calculating the value m of the finished product length a / fixed length b; obtaining all factors q of the value m, and arranging all the factors from small to large to obtain q <subgt;0< / subgt;、q<subgt;1< / subgt;、…、q<subgt;n< / subgt;;根据因数q*定尺长度b计算得到倍尺长度s;根据计算得到所有倍尺长度并按照从大到小的顺序进行排列s<subgt;n< / subgt;、s<subgt;n‑1< / subgt;、…、s<subgt;1< / subgt;,若s<subgt;m< / subgt;<L<s<subgt;m+1< / subgt;,则s<subgt;m< / subgt;为最终的倍尺和首刀长度;倍尺长度s<subgt;m< / subgt;对应的因数为q<subgt;m< / subgt;,倍尺剪剪切次数p=m / q<subgt;m< / subgt;‑1;将倍尺长度s<subgt;m< / subgt;和倍尺剪剪切次数p录入系统控制轧钢剪切。本发明可以实现不同规格定尺螺纹钢生产,非定尺长度可以精准控制,提升成材率。

Description

Technical Field

[0001] The present invention relates to a method for determining multiple lengths, in particular to a method for determining the optimal multiple length for rolling steel shearing, and belongs to the technical field of rolling steel. Background Art

[0002] Due to different wear degrees of the continuous casting mold copper tubes and multi-machine multi-strand production, the weights of each billet cannot be made exactly the same; during normal rolling production, the same weight billets are used for different specifications and fixed-length deformed steel bars, and the resulting non-fixed lengths are also different. For a billet, after removing the losses in the heating furnace, the head and tail cut by the flying shear, and the short head cut by the cold shear, the remaining part is the finished product; according to the total length of the finished steel bars, after being sheared by the multiple-length flying shear, they are neatly thrown onto the cooling bed according to the specified length. The fixed number of pieces and length of the finished deformed steel bar package, due to different non-fixed lengths, as well as different lengths of the first cut, multiple lengths, and last cut, result in different numbers of deformed steel bars cut by the cold shear for each cut, and there are non-fixed lengths mixed in. When transported to the finishing cooling bed, it is necessary to manually pick out the non-fixed lengths, and it is necessary to use machines or manual labor to count the number of pieces, which requires a large amount of manpower from the enterprise and causes economic waste. If the lengths of the first cut and multiple lengths can be made the same, and the length of the last cut is exactly one non-fixed length longer than the multiple length, it is possible to separate the non-fixed lengths and fixed lengths, and make the number of pieces taken out by the large flat support and the number of pieces in the finished product package the same. Each cut by the cold shear is a finished product package, and there is no need to count the number of pieces and pick out the non-fixed lengths during finish rolling, achieving unmanned operation. Therefore, it is necessary to design a new method to determine an optimal multiple length. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for determining the optimal multiple length for rolling steel shearing, and solve the problems that the length of the last cut is one non-fixed length longer than the multiple length and the lengths of the first cut and multiple lengths are the same.

[0004] To solve the above technical problem, the technical solution adopted by the present invention is:

[0005] A method for determining the optimal multiple length for rolling steel shearing, characterized by comprising the following steps:

[0006] S1. Calculate the finished product length a of different specifications and fixed lengths according to the weight of the billet;

[0007] S2. Calculate the value m of the finished product length a / fixed length b;

[0008] S3. Find all factors q of the value m, and arrange all the factors in ascending order to obtain q0, q1,..., q n ;

[0009] S4. Calculate the multiple length s according to the factor q * fixed length b;

[0010] S5. Calculate all multiple-lengths obtained according to step S4 and arrange them in descending order. n , n-1 , …, s1. If m <L < s m+1 , then m is the final multiple-length and the length of the first cut.

[0011] S6. The factor corresponding to the multiple-length s m is q m , and the number of cuts p of the multiple-length shear is p = m / q m - 1;

[0012] S7. Input the multiple-length s m and the number of cuts p of the multiple-length shear into the system to control the rolling steel shearing.

[0013] Further, the specific content of step S1 is as follows: Given the weight per meter of the billet, the density of the steel, and the length of the billet, the theoretical weight of the billet can be calculated. According to the corresponding fixed-length and considering the 0.3% oxidation loss in the rolling line, the flying shear waste weight in the rolling area, and the actual weight per meter, the finished product length a can be calculated.

[0014] Further, in step S2, the integer part of the value m cannot be a prime number. When the integer part of the value m is a prime number, adjust the finished product length a of the billet until the integer part of the value m is no longer a prime number.

[0015] Further, the adjustment of the finished product length a of the billet is achieved by adjusting the rolling parameters.

[0016] Further, the specific content of step S3 is as follows: First, decompose the value m into prime factors, then obtain all factors q according to the decomposed prime factors, and arrange all the obtained factors q in ascending order to get q0, q1, …, q n .

[0017] Further, the specific content of step S5 is as follows: Calculate all multiple-lengths obtained according to step S4 and arrange them in descending order s n , s n-1 , …, s1. Compare all multiple-lengths with the cooling bed length L one by one in descending order. When n >L, continue to calculate n-1 . When n-1 >L, continue to calculate n-2 . Repeat the above calculation and comparison process until when m <L < s m+1 , then m is the final multiple-length and the length of the first cut.

[0018] Furthermore, all prime factors obtained by decomposing the value m are arranged from small to large, and the calculation order of the factors from large to small is determined according to the number of prime factors and the order of selection. When each factor is calculated, the corresponding multiple length s is calculated, and the s value is compared with the cooling bed length L. When the multiple length s is determined m The calculation stops when .

[0019] Compared with the prior art, the present invention has the following advantages and effects:

[0020] 1. The method for determining the optimal multiple of steel rolling shearing of the present invention can realize the production of fixed-length rebars of different specifications, and the non-fixed-length length can be accurately controlled, thereby improving the yield rate;

[0021] 2. The present invention realizes that the length of the first knife and the double length are consistent, and the tail knife has just one non-fixed length longer than the double length, which can realize the separation of non-fixed length and fixed length; and the number of counts of the large flat tray is the same as the number of finished bags. The cold shearing machine can produce a finished bag in one shearing. There is no need to count the counts and sort the non-fixed lengths during finishing rolling, which realizes unmanned operation and does not require manual or machine counting, thereby improving production rhythm and reducing the number of people in positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a flow chart of the method for determining the optimal shearing multiple of steel rolling according to the present invention.

[0023] Figure 2 This is a table for estimating the length of finished steel billets according to Example 1 of the present invention.

[0024] Figure 3 This is a multiple length determination table according to the first embodiment of the present invention.

[0025] Figure 4 This is a table for estimating the finished length of a steel billet according to Example 2 of the present invention.

[0026] Figure 5 This is a multiple length determination table according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to elaborate on the technical solutions adopted by the present invention to achieve the predetermined technical purpose, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments, and the technical means or technical features in the embodiments of the present invention can be replaced without creative work. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0028] like Figure 1As shown in the figure, a method for determining the optimal multiple length of rolling steel shearing according to the present invention is characterized by including the following steps:

[0029] S1. Calculate the finished product length a of different specifications and fixed lengths according to the weight of the steel billet; the weight per meter of the steel billet, the density of the steel, and the billet length of the steel billet are known values, then the theoretical billet weight of the steel billet can be calculated. According to the corresponding fixed length, and based on the 0.3% oxidation loss in the rolling line, the flying shear waste weight in the rolling area, and the actual weight per meter, the finished product length a is calculated.

[0030] S2. Calculate the value m of the finished product length a / fixed length b; the integer part of the value m cannot be a prime number. When the integer part of the value m is a prime number, adjust the finished product length a of the steel billet until the integer part of the value m is not a prime number. The adjustment of the finished product length a of the steel billet is achieved by adjusting the rolling parameters.

[0031] S3. First, decompose the value m into prime factors, then obtain all factors q according to the decomposed prime factors, and arrange all the obtained factors q in ascending order to get q0, q1,..., q n .

[0032] S4. Calculate the multiple length s according to the factor q * fixed length b, s = q * b;

[0033] S5. Calculate all the multiple lengths obtained according to step S4 and arrange them in descending order s n 、s n-1 、…、s1. If s m < L < s m+1 , then s m is the final multiple length and the first cut length.

[0034] Specifically, calculate all the multiple lengths obtained according to step S4 and arrange them in descending order s n 、s n-1 、…、s1. Compare all the multiple lengths with the cooling bed length L one by one from large to small. When s n > L, continue to calculate s n-1 . When s n-1 > L, continue to calculate S n-2 . Repeat the above calculation and comparison process until when s m < L < s m+1 ), then s m is the final multiple length and the first cut length.

[0035] S6. The factor corresponding to the multiple length s m is q m , and the multiple shear cutting times p = m / q m - 1;

[0036] S7. Input the multiple-length s m and the number of cuts p of the multiple-length shear into the system to control the rolling steel shearing.

[0037] In the above calculation process, in order to reduce the calculation steps, all the prime factors obtained by decomposing the value m into prime factors are arranged in ascending order. The calculation order of the factors from large to small is determined according to the number and selection order of the prime factors. When each factor is calculated, the corresponding multiple-length s is calculated, and the s value is compared with the cooling bed length L. When the multiple-length s m is determined, the calculation stops.

[0038] The present invention will be further described below through specific embodiments.

[0039] Embodiment 1:

[0040] A method for determining the optimal multiple-length of rolling steel shearing, taking the Φ16mm*4 splitting process and a fixed length of 12 meters as an example, includes the following steps:

[0041] S1. As Figure 2 shown, calculate the finished product lengths of different specifications and fixed lengths according to the weight of the steel billet.

[0042] S2. Calculate the value m of the actual length of the finished product / the fixed length, 543.06 / 12 = 45.255, and the integer part is 45.

[0043] S3. Decompose 45 into prime factors to obtain the corresponding factors 3, 3, 5.

[0044] S4. s = 12 * 3 * 5 = 180 > 132, recalculate, s = 12 * 3 * 3 = 108 < 132;

[0045] S5. The maximum value of s is 108;

[0046] S6. As Figure 3 shown, take 108 as the multiple-length and the first cut length, and the number of cuts of the multiple-length shear is 5 - 1 = 4 times.

[0047] Embodiment 2:

[0048] A method for determining the optimal multiple-length of rolling steel shearing, taking the Φ18mm*3 splitting process and a fixed length of 12 meters as an example, includes the following steps:

[0049] S1. As Figure 4 shown, calculate the finished product lengths of different specifications and fixed lengths according to the weight of the steel billet.

[0050] S2. Calculate the value m of the actual length of the finished product / the fixed length, 572.02 / 12 = 47.669, and the integer part is 47;

[0051] S3. Factor 45. 47 is a prime number. Adjust the billet length. 579.24 / 12=48.27. The integer part is 48, which is not a prime number. Factor the corresponding factors 2, 2, 2, 2, 3.

[0052] S4, s=12*2*2*2*3=288>132, recalculate, s=12*2*2*2*2=192<132, recalculate s=12*3*2*2=144>132, recalculate s=12*2*2*2=96<132;

[0053] S5,s value is up to 96;

[0054] S6, such as Figure 5 As shown, take 96 as the multiple length and the length of the first knife, and the number of times the multiple length shears are cut is 6-1=5 times.

[0055] It can be seen from the above embodiments that the final tail knife length is only a small non-fixed length longer than the double length, which greatly improves the yield rate.

[0056] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the present profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement of the above embodiments made according to the technical essence of the present invention, within the spirit and principles of the present invention, without departing from the content of the technical solution of the present invention, shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for determining the optimal multiple length in steel rolling shearing, characterized in that The steps include: S1. Calculate the finished product length a of different specifications and fixed lengths according to the weight of the steel billet; S2. Calculate the value m of the finished product length a / fixed length b; When the integer part of the value m is a prime number, adjust the finished product length a of the steel billet until the integer part of the value m is not a prime number; S3. Find all factors q of the value m, and arrange all the factors in ascending order to get q0, q1, …, q n ; S4. Calculate the multiple-length s according to the factor q * fixed length b; S5. Calculate all multiple-lengths obtained according to step S4 and arrange them in descending order n , n-1 , …, s1. If s m < L < s m+1 , then s m is the final multiple-length and the length of the first cut The specific steps of step S5 are as follows: calculate all multiple-lengths obtained according to step S4 and arrange them in descending order n 、s n-1 、…、s1. Compare all multiple-lengths with the cooling bed length L one by one in descending order. When s n >L, continue to calculate s n-1 . When s n-1 >L, continue to calculate S n-2 . Repeat the above calculation and comparison process until when s m <L<s m+1 , then s m is the final multiple-length and the length of the first cut. S6. Multiple-length s m The corresponding factor is q m , and the number of multiple-length shear cuts p = m / q m - 1; S7. Input the multiple-length s m and the number of cuts p of the multiple-length shear into the system to control the rolling mill shearing.

2. The method for determining the optimal multiple length of rolling steel shearing according to claim 1, characterized in that: The specific content of step S1 is as follows: Given the weight per meter of the steel billet, the density of the steel, and the length of the steel billet, the theoretical weight of the steel billet can be calculated. According to the corresponding fixed length, and considering the oxidation loss of 0.3‰ in the rolling line, the flying shear waste weight in the rolling area, and the actual weight per meter, the finished product length a can be calculated.

3. The method for determining the optimal multiple length of rolling steel shearing according to claim 1, characterized in that: The adjustment of the finished product length a of the steel billet is achieved by adjusting the rolling parameters.

4. The method for determining the optimal multiple length of rolling steel shearing according to claim 1, characterized in that: The specific steps of step S3 are as follows: first, decompose the value m into prime factors, then obtain all factors q based on the decomposed prime factors, and arrange all the obtained factors q in ascending order to get q0, q1, …, q n .

5. The method for determining the optimal multiple-length of rolling steel shearing according to claim 1, characterized in that: Arrange all the prime factors obtained by decomposing the value m into prime factors in ascending order, and determine the calculation order of the factors from largest to smallest according to the number of prime factors and the selected order. When calculating each factor, calculate the corresponding multiple length s, and compare the s value with the length L of the cooling bed. When it is determined that the multiple length s m reaches this value, stop the calculation.

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