Method for greatly reducing non-sizing in bar production
By setting a multiple length setting scheme and tail cutter range, and using fixed length baffles and lifting pressure plates for sorting, the problem of waste of non-fixed length bars during rolling is solved, and the full utilization of non-fixed length bars and optimization of inventory management are achieved.
Patent Information
- Application Number
- CN202511359948.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-23
- Publication Date
- 2025-11-07
AI Technical Summary
Existing technologies cannot effectively utilize non-standard length bars generated during the rolling process, leading to waste and inventory management problems. In particular, when the tail cutter length is inconsistent, it cannot be effectively collected, resulting in losses of finished products and recycling price differences.
By setting a multiple length setting scheme and a tail knife range, sorting is performed in the conveying direction using a fixed length baffle and a lifting pressure plate. The spacing is adjusted according to the fluctuation range of the finished product length and the fixed length, so as to make full use of non-fixed length.
It effectively reduces waste of non-standard length bars, improves inventory management efficiency, and reduces losses from finished products and recycling.
Smart Images
Figure CN120901088A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of bar rolling production technology, and in particular to a method for significantly reducing non-standard length in bar production. Background Technology
[0002] With the increasing demand for customization in the steel market, the standard lengths of bulk commodities such as 9m and 12m as stipulated by national standards can no longer meet the current market demand for customization. There is an increasing demand for various non-standard lengths such as 11m, 11.3m, 11.8m, and 9.6m (which can be directly cut to achieve the customized length, eliminating the need for further welding at the application end). However, although the final lengths are different, the total length of the rolled bars is the same because the raw material is the same (the steel billet used). This makes it impossible for the subsequent cold shearing machine to cut them into different lengths. If the weight of the steel billet is changed to correspond to various lengths, it will cause inventory transfer problems at the steelmaking end, bringing even more trouble. This results in the inability to effectively collect the shorter lengths, leading to waste. For example, when rolling a fixed length of 11.3m, the final tail length reaches 9m-11m. At this point, this "short fixed length" becomes recycled, resulting in waste, mainly from the price difference between the finished product and the recycled product. Therefore, the main purpose and direction of this patent is to find out how to effectively utilize the short fixed length through certain devices and calculation methods to reduce losses for enterprises. Summary of the Invention
[0003] The purpose of this invention is to provide a method for significantly reducing non-standard length in bar production. This method solves the problem that some tail cutter lengths are sufficient while others are shorter than the actual length, making it impossible to collect all of them (for example, when producing 11.3m standard lengths, the tail cutter length fluctuates between 10.5 and 13.5m). Since there is no effective sorting method, all of them must be recycled as non-standard lengths, resulting in waste. This invention achieves full utilization of non-standard lengths and reduces losses.
[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A method for significantly reducing non-standard length in bar production includes the following steps: setting a corresponding multiple length setting scheme and tail cutter range based on the finished product length fluctuation range and the standard length D of rolling; obtaining the length range X of the last cut by the tail cutter based on the tail cutter range; and preset the minimum collection length D. min Fixed-length baffles and lifting pressure plates are installed at the front and rear along the conveying direction of the finished product. The distance between the lifting pressure plate and the fixed-length baffles is J. The length range X includes cases A and B. Case A includes X having a portion greater than D and a portion less than D. In this case, the spacing J is adjusted to D, and the lifting plate presses down the portion longer than D, while the remaining portion is conveyed away. Case B includes X being entirely less than D, but having a portion greater than D.min , part less than D min , in which case the distance J is adjusted to D min , the lifting and pressing plate will press the part longer than D min , and the rest will be transported away.
[0005] Further, in the multiple-length setting scheme, each multiple-length is set to be several times of the fixed-length D plus a margin.
[0006] Further, the margin is set to be 1m.
[0007] Further, in the multiple-length setting scheme, the tail-knife range is the difference between the multiple-length and the fixed-length D, and the tail-knife range is set to be close to or longer than other multiple-lengths.
[0008] Further, the length range X is the tail-knife range minus several times of the fixed-length D minus the length of the cutting head of the cold shearing machine, and the length range X is the minimum range greater than a preset value.
[0009] Further, the length of the cutting head of the cold shearing machine is 30cm.
[0010] Further, the length range X also includes case C, in which case X is all not less than the corresponding D or all less than D min , in which case no treatment is needed.
[0011] Further, in case A, if all the products transported away are longer than D min , they are collected and packed, and then cut into fixed-lengths of D min .
[0012] Further, the case B also includes the case that X is all less than D and greater than D min , in which case the distance J is still adjusted to D min , and the lifting and pressing plate will press the products, and the short products caused by sampling will be transported away.
[0013] Further, the lifting and pressing plate is a rubber plate.
[0014] In summary, the present application has the following advantages: The appropriate multiple-length setting scheme and tail-knife range are formulated, and the length range of the last tail-knife is calculated, and through the comparison between the length range and the fixed-length and the shortest collection length, the sorting and rejection work is performed, so that the non-fixed-lengths are fully utilized, and the waste and loss are reduced. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 is a principle schematic diagram of case A in the method for greatly reducing non-fixed-lengths in the production of bars according to the present application; Figure 2 is a schematic diagram of case B in the method for greatly reducing non-sizes in bar production. DETAILED DESCRIPTION
[0016] The specific embodiments of the present application will be further described below with reference to the accompanying drawings. The embodiments do not constitute a limitation on the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0017] A method for greatly reducing non-sizes in bar production, comprising the following steps, Step S10, first determine the characteristics of the rolling production line, such as billet weight, cooling bed length, size setting, cold shearing device parameters, etc.; according to the length fluctuation range of the finished product and the rolling size length D, set the corresponding optimal size setting scheme and tail knife range, for example, in the present embodiment, a certain production line produces screw 25 specification bar, the billet weight is 3560 kg, the cooling bed is 135 m long, and the finished product length fluctuates between 467 m-470 m (the main reasons for the fluctuation are that the billet weight itself fluctuates, and various factors affect the rolling process), the production line mainly rolls the following size lengths: 9 m / 12 m / 11.3 m / 11.6 m / 9.8 m / 10.8 m / 14.2 m.
[0018] In the optimal size setting scheme, the size is a multiple of the rolled size; the difference between the length fluctuation range of the finished product and the sum of each size length is the tail knife range, the tail knife range is set to be as long as possible or close to other sizes (tail knife refers to the last size), which is convenient for collection; the number of sizes should be as short as possible; because of cold shrinkage and other conditions, there is a 1 m margin for each size, that is, each size length = several times of the size length D + 1 m margin.
[0019] In the present embodiment, according to the above logic, the optimal size setting is made, and the length range X of the last shear of the tail knife is obtained according to the tail knife range; the length range X = tail knife range - several times of the size length D - the length of the shear head of the cold shearing machine, the length range X takes the minimum range greater than the preset value (the preset value can be set to 4 m, etc., to facilitate the roller to convey the finished steel), the length of the shear head of the cold shearing machine is 30 cm, because the head shape is irregular and the performance may be unstable, so 30 cm is cut off at the head of the cold shearing machine; because the tail knife is set to be as long as possible or close to other sizes in the present embodiment, the several times of the size length D can be calculated according to the length corresponding to the maximum size first, if the result is less than the preset value, a size length D is added, and the results of the size setting scheme and the tail knife range are shown in the following table.
[0020]
[0021] Table I For example, in this application, Step S20, preset the minimum collection length D min (9m in this embodiment), according to the optimal scheme corresponding to each non-calibration size of the corresponding production line determined in step S10, the length of the final tail knife (tail knife range and the length range X of the last shear), confirm the corresponding state of each size, according to Table I can be aligned for classification, the length range X is divided into case A, case B and case C, Case A solves the problem that the tail knife length is partially sufficient and partially shorter than the actual length, so that it cannot be collected in full, specifically, there are parts greater than D and parts less than D in X, case B solves the problem that the tail knife length itself is insufficient but higher than 9m, causing waste, specifically, X is less than D, but there are parts or all greater than D min , case C is that X is not less than the corresponding D or less than D min , as shown in the following table;
[0022] Table II Step S30, the finished product is transported through multiple roller beds, and size stop plates and lifting pressure plates are arranged in front and back in the conveying direction, the lifting pressure plate is a rubber plate to avoid damaging the steel, the size stop plate and the lifting pressure plate are both driven to lift by linear drive structures such as air cylinders, the size stop plate can also adjust the distance from the lifting pressure plate through horizontal linear modules and other structures; in some embodiments, the size stop plate can also achieve the above distance adjustment by setting multiple positions, or by disassembling and replacing the position for adjustment; the size stop plate stops the finished product downward to align or releases it upward, and the lifting pressure plate presses the finished product at the corresponding position downward to allow other finished products to leave under the roller bed conveying; The distance between the lifting pressure plate and the size stop plate is J, which is set as follows according to the length range X, As shown in Figure 1 , there are parts greater than the current size length D and parts less than the size length D in X, the distance J is adjusted to D, the lifting pressure plate is lowered to press the part longer than D, and the rest is transported away, if all the transported away finished products are longer than D min , they will be collected and packaged, waiting for subsequent processing, such as cutting into sizes of length D min , while the part longer than D continues to be transported, and finally cut into sizes of corresponding length D; As shown in Figure 2 , the distance J is adjusted to D min , such as X is partially greater than D min , and partially less than D min, the lifting and pressing plate will press the part of the product longer than D min , and the rest of the product will be transported away for recycling, and if X is all greater than D min (e.g. 14.2m in Table 2, the tail knives are all less than 14.2m but all greater than 9m), in this case, the distance J is still adjusted to D min , the lifting and pressing plate will press the part of the product, and the short product caused by sampling and other conditions will be transported away for collection, and finally the product greater than D min (9m) will be collected, and then concentrated cutting will be carried out during the planned maintenance time to realize the change from recycling to selling of fixed-length products.
[0023] In case C, no treatment is needed; if all are not less than the corresponding D, continue to transport and then uniformly treat, cut into fixed-length products of the corresponding length D, if all are less than D min , then recycle.
[0024] The above is only the preferred embodiment of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements shall also be considered to fall within the protection scope of the technical solutions of the present application.
Claims
1. A method of producing a bar with a substantial reduction in off- gauge, characterized by: It comprises the following steps: setting corresponding multiple-length setting scheme and tail cutter range according to the length fluctuation range of finished product and the rolling fixed-length D, and obtaining the length range X of the last cut of tail cutter according to the tail cutter range; presetting the shortest collection length D min The fixed-length baffle and the lifting baffle are arranged in front and back in the conveying direction of the finished product, and the spacing between the lifting baffle and the fixed-length baffle is J, The length range X includes cases A and B. Case A includes X having a portion greater than D and a portion less than D. In this case, the spacing J is adjusted to D, and the lifting plate presses down the portion longer than D, while the remaining portion is conveyed away. Case B includes X being entirely less than D, but having a portion greater than D. min Part less than D min In this case, the spacing J is adjusted to D. min The lifting pressure plate will be longer than D. min Part of it is pressed down, while the rest is transported away.
2. A method of producing a bar with a substantial reduction in off- gauge according to claim 1, characterized in that: The multiple length setting scheme sets each multiple length = several times of the fixed length D + a margin.
3. A method of producing a bar with a substantial reduction in off- gauge according to claim 2, characterized in that: The margin is set to 1 m.
4. A method of producing a bar with a substantial reduction in off- gauge according to claim 1 or 2, characterized in that: In the multiple length setting scheme, the difference between the finished product length fluctuation range and each multiple length is a tail knife range, and the tail knife range is set to be close to or longer than other multiples.
5. A method of producing a bar with a substantial reduction in off- gauge according to claim 1, characterized in that: The length range X = tail knife range - several times of the fixed length D - cold shear machine cutter length, and the length range X takes the minimum range greater than the preset value.
6. A method of producing a bar with a substantial reduction in off- gauge according to claim 5, characterized in that: The cold shear machine cutter length is 30 cm.
7. A method of producing a bar with a substantial reduction in off- gauge according to claim 1, characterized in that: The length range X further includes a case C, the case C being that all of X is not less than the corresponding D or all less than D min In this case, no processing is performed.
8. A method of producing a bar with a substantial reduction in off- gauge according to claim 1 or 7, characterized in that: In case A, the finished products delivered away are all longer than D min Then, they are collected and packed, waiting for centralized cutting into fixed lengths of D min .
9. A method of producing a bar with a substantial reduction in off- gauge according to claim 1 or 7, characterized in that: Case B also includes X is less than D and greater than D min In this case, the pitch J is still adjusted to D min The lift and pressure plate will hold the finished part, and the short off feed from sampling will be removed.
10. A method of producing a bar with a substantial reduction in off- gauge according to claim 1, characterized in that: The lifting pressure plate is a rubber plate.