Strip steel shearing method

Abstract

The invention discloses a strip steel shearing method. The technical problem of speed reduction or shutdown caused by different operation methods in the prior art is solved. The method comprises the following steps that the distribution condition of strip steel edge defects in the length direction of strip steel is judged, if the spacing distance between every two adjacent defects is larger than a first preset value, all the defects are sheared independently through a crescent shear, and if the spacing distance between every two adjacent defects is smaller than or equal to the first preset value, all the defects are sheared independently through a crescent shear. If yes, a crescent shear is used for conducting continuous shearing twice in the length direction of the strip steel so that a large crescent can be sheared at the two defect positions; and judging the distance between the strip steel edge defect and the edge of the strip steel, and if the distance between the defect and the edge of the strip steel is smaller than or equal to a second preset value, directly shearing the defect. According to the strip steel shearing method, the specific shearing method and standard are formulated, so that the shearing efficiency and precision are improved, the accident rate is reduced, and the stability of the rolling process is improved.

Description

Technical Field

[0001] This application belongs to the field of cold-rolled strip steel production technology, specifically relating to a strip steel shearing method. Background Technology

[0002] In the production of cold-rolled strip steel, when defects such as edge cracks, inclusions, folds, delamination, and scratches are found on both sides of the steel coil, crescent-shaped shearing is usually required. However, because the location of defects on the strip edge is not fixed, operators need to repeatedly confirm whether the defect is within the shearing range of the crescent shear blade. Especially when producing narrow strip steel, the edge is far from the shear blade, and operators need to stand sideways, making it difficult to stop the defect in the correct position by visual inspection alone. In addition, when intermittent defects require continuous crescent shearing, the connection between the crescents is not continuous, easily resulting in misaligned peaks, which can easily damage the rolls during rolling. Currently, there are no specific shearing methods or standards for various defects encountered in production, leading to inconsistent operating techniques when handling common defects, causing frequent speed reductions or shutdowns in subsequent processes, affecting production efficiency and product quality. Summary of the Invention

[0003] To solve the above-mentioned technical problems, this application discloses a method for shearing strip steel.

[0004] The technical solution adopted to achieve the purpose of this application is as follows: This application discloses a strip steel shearing method, including the following steps: determining the distribution of the strip steel edge defects along the length direction of the strip steel; if the distance between two adjacent defects is greater than a first preset value, then each defect is sheared individually using crescent shears; if the distance between two adjacent defects is less than or equal to the first preset value, then two consecutive shearings are performed along the length direction of the strip steel using crescent shears to cut a large crescent at the two defect positions; determining the distance between the strip steel edge defect and the edge of the strip steel; if the distance between the defect and the edge of the strip steel is less than or equal to a second preset value, then the defect is directly sheared.

[0005] According to one embodiment of the present invention, if the distance between the defect and the edge of the strip is greater than a second preset value and less than or equal to a third preset value, the width of the strip is determined. If the width of the strip is greater than or equal to a fourth preset value, the crescent shears are ordered to perform two consecutive cuts along the width direction of the strip to remove the defect. If the width of the strip is less than the fourth preset value, the defect is not processed.

[0006] According to one embodiment of the present invention, if the distance between the defect and the edge of the strip is greater than a second preset value and less than or equal to a third preset value, the width of the strip is greater than or equal to a fourth preset value, and the distance between two adjacent defects is less than or equal to a first preset value, then the crescent shears are first made to perform two consecutive cuts along the width direction of the strip, and then the strip is moved to the actual cutting range of the crescent shears, and the crescent shears are again made to perform two consecutive cuts along the width direction of the strip.

[0007] According to one embodiment of the present invention, the second preset value is the same as the maximum feed distance of the crescent shears.

[0008] According to one embodiment of the present invention, the first preset value is twice the actual cutting range of the crescent-shaped scissors.

[0009] According to one embodiment of the present invention, the maximum width H of the crescent shears is measured, the width h of the straight portion of the crescent shears is measured, and the actual cutting range L of the crescent shears is set, L = h - 2x, where x is a manually set constant; a first marking line W is set, the position of W is W = H / 2, a second marking line Y is set, the distance between Y and W is Y = W + L / 2, and a third marking line Z is set, the distance between Z and W is Z = WL / 2; if the interval between two adjacent defects is greater than a first preset value, the strip steel stops moving when the defect is located between the second and third marking lines; if the interval between two adjacent defects is less than or equal to the first preset value, the strip steel stops moving when the defect is located at the second marking line.

[0010] According to one embodiment of the present invention, if the distance between two adjacent defects is greater than a first preset value, the strip steel is moved to a stop when the defect is located at the first marking line.

[0011] According to one embodiment of the present invention, the maximum feed distance of the crescent shear is 150mm, the preset feed distance of the crescent shear is 150mm, and when the distance between the defect and the edge of the strip is greater than a second preset value and less than or equal to a third preset value, the second feed distance of the crescent shear is the third preset value minus the first preset value, and the third preset value is less than or equal to 180mm.

[0012] According to one embodiment of the present invention, the actual cutting range L of the crescent scissors is 400 mm, and the constant x is greater than or equal to 25 mm and less than 50 mm.

[0013] According to one embodiment of the present invention, the fourth preset value is 950 mm.

[0014] As can be seen from the above technical solution, the strip shearing method disclosed in this application includes the following steps: determining the distribution of edge defects along the length of the strip; if the distance between two adjacent defects is greater than a first preset value, then each defect is sheared individually using crescent shears; if the distance between two adjacent defects is less than or equal to the first preset value, then two consecutive cuts are made along the length of the strip using crescent shears to cut a large crescent at the positions of the two defects; determining the distance between the edge defect and the edge of the strip; if the distance between the defect and the edge of the strip is less than or equal to a second preset value, then the defect is directly sheared.

[0015] The strip shearing method disclosed in this application avoids the misalignment phenomenon caused by discontinuous connection between strips, thus reducing the incidence of accidents such as strip breakage and roll jamming during rolling. This significantly improves the stability of the rolling process, helping companies increase production efficiency, reduce production costs, and enhance market competitiveness. By using preset values ​​to guide the shearing operation, subjective judgment and manual intervention by operators are reduced, thereby lowering shearing errors caused by human factors and improving shearing accuracy. Attached Figure Description

[0016] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0017] Figure 1 This is a schematic flowchart of a strip shearing method in one or more embodiments of this application;

[0018] Figure 2 This is a schematic diagram of the markings for the crescent-shaped scissors in one or more embodiments of this application. Detailed Implementation

[0019] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] Furthermore, reference numerals and / or reference letters may be repeated in different examples in this application. Such repetition is for simplification and clarity purposes and does not in itself indicate a relationship between the various embodiments and / or settings discussed. In addition, this application provides examples of various specific processes and materials; however, those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0022] This invention discloses a strip shearing method that solves the technical problem of speed reduction or machine stoppage caused by different operating methods in the prior art, thereby improving shearing efficiency and accuracy, reducing the accident rate, and enhancing the stability of the rolling process.

[0023] The technical solution of this application will be described in detail below through specific embodiments:

[0024] See Figure 1 and Figure 2 This application discloses a strip steel shearing method, which includes the following steps: determining the distribution of edge defects along the length of the strip steel; if the distance between two adjacent defects is greater than a first preset value, then using crescent shears to shear each defect individually; if the distance between two adjacent defects is less than or equal to the first preset value, then using crescent shears to perform two consecutive cuts along the length of the strip steel to cut a large crescent at the locations of the two defects; determining the distance between the edge defect and the edge of the strip steel; if the distance between the defect and the edge of the strip steel is less than or equal to a second preset value, then directly shearing the defect.

[0025] Among them, the crescent shears have a symmetrical structure. The initial position of the crescent shears is located above both sides of the strip steel. The top view of the crescent shears is a crescent shape formed by connecting arc lines and transverse cleaving lines. The crescent shears on both sides of the strip steel make linear movements of infeeding or retraction perpendicular to the side of the strip steel.

[0026] Figure 2 In the diagram, 100 represents the crescent shears, and Ⅰ represents the strip feed direction.

[0027] The strip shearing method disclosed in this embodiment avoids the misalignment phenomenon caused by discontinuous connections between strips by establishing specific shearing methods and standards, thus reducing the incidence of accidents such as strip breakage and roll jamming during rolling. This significantly improves the stability of the rolling process, helping enterprises increase production efficiency, reduce production costs, and enhance market competitiveness. By using preset values ​​to guide the shearing operation, subjective judgment and manual intervention by operators are reduced, thereby lowering shearing errors caused by human factors and improving shearing accuracy.

[0028] In one embodiment, if the distance between the defect and the edge of the strip is greater than a second preset value and less than or equal to a third preset value, the width of the strip is determined. If the width of the strip is greater than or equal to a fourth preset value, the crescent shears are used to perform two consecutive cuts along the width direction of the strip to remove the defect. If the width of the strip is less than the fourth preset value, the defect is not processed.

[0029] When the distance between the defect and the strip edge is within a specific range (greater than the second preset value and less than or equal to the third preset value), the shearing method is determined by judging the strip width. For strips with a width greater than or equal to the fourth preset value, a crescent shear is used to cut off the defect twice consecutively along the width direction. This can remove the defect more thoroughly, avoid the defect affecting product quality in subsequent rolling processes, and improve the overall quality of the strip.

[0030] For narrow strip steel with a width less than the fourth preset value, no defects are addressed. This is because such defects may not significantly affect the final product quality in subsequent processing or usage scenarios, or the cost of addressing such defects would be too high.

[0031] With clear width judgment criteria, operators can make quick decisions and execute corresponding operations, reducing waiting time and decision-making costs in the production process, making the production process smoother and more efficient.

[0032] In one embodiment, if the distance between the defect and the edge of the strip is greater than a second preset value and less than or equal to a third preset value, the width of the strip is greater than or equal to a fourth preset value, and the distance between two adjacent defects is less than or equal to a first preset value, then the crescent shears are first made to perform two consecutive cuts along the width direction of the strip, and then the strip is moved to the actual cutting range of the crescent shears, and the crescent shears are again made to perform two consecutive cuts along the width direction of the strip.

[0033] This operation can efficiently and precisely handle densely distributed defects, ensuring that each defect is effectively removed and preventing defect residue from affecting subsequent rolling and product quality. By performing two continuous shearing operations along the width direction and moving the strip, the shearing coverage is expanded, improving the removal rate of dense defects and reducing the generation of defective products due to incomplete defect handling.

[0034] In one embodiment, the second preset value is the same as the maximum feed distance of the crescent shears.

[0035] During the strip shearing process, multiple preset values ​​are used to determine the operating method under different conditions. Setting the second preset value to be the same as the maximum feed distance of the crescent shears reduces the number of parameters that need to be set and memorized individually, thus simplifying the operation process.

[0036] The maximum feed distance of the crescent shears is their effective cutting range. Setting the second preset value to this distance ensures that when the distance between the defect and the strip edge is less than or equal to this value, the defect is within the cutting range of the crescent shears and can be accurately cut. This avoids the problem of incomplete cutting or failure to cut due to the defect being outside the cutting range, thus improving the cutting quality.

[0037] Using the maximum feed distance as the second preset value ensures that the crescent shears perform optimally during the cutting process. Setting the second preset value too small will not limit the use of the crescent shears, nor will setting it too large cause the cutting operation to exceed the equipment's capabilities, thus guaranteeing stable operation and efficient utilization of the equipment.

[0038] In traditional operations, operators need to visually inspect the location of defects and determine whether shearing is suitable. This process is easily influenced by subjective and environmental factors, leading to inaccurate judgments. By setting a second preset value equal to the maximum feed distance, visual judgment is transformed into a parameter-based objective judgment, reducing human visual error and improving the accuracy of shearing.

[0039] In one embodiment, the first preset value is twice the actual cutting range of the crescent-shaped scissors.

[0040] When the distance between two adjacent defects is less than or equal to twice the actual cutting range of the crescent shears, a specific continuous cutting method is adopted (as mentioned above, first cut twice along the width direction, then move and cut again).

[0041] The initial preset value ensures that when defects are dense, the crescent shears can cover and remove all relevant defects, avoiding defect residue caused by insufficient shearing range. By precisely controlling the shearing range and path, damage to non-defective areas of the strip can be reduced, maintaining the integrity and mechanical properties of the strip, and providing a better foundation for subsequent processing and use.

[0042] When the crescent shears make two consecutive cuts along the length of the strip, the edges of the two adjacent crescents overlap, thus forming a large crescent, making the cut strip more aesthetically pleasing.

[0043] In one embodiment, the maximum width H of the crescent shears is measured, the width h of the straight portion of the crescent shears is measured, and the actual cutting range L of the crescent shears is set, L = h - 2x, where x is a manually set constant; a first marking line W is set, with the position of W = H / 2; a second marking line Y is set, with the distance between Y and W being Y = W + L / 2; a third marking line Z is set, with the distance between Z and W being Z = WL / 2; if the distance between two adjacent defects is greater than a first preset value, the strip steel stops moving when the defect is located between the second and third marking lines; if the distance between two adjacent defects is less than or equal to the first preset value, the strip steel stops moving when the defect is located at the second marking line.

[0044] By setting a first marking line W, a second marking line Y, and a third marking line Z, a clear positioning reference is provided for the movement of the strip steel. When the distance between adjacent defects is greater than a first preset value, the strip steel moves to a position between the defects Y and Z; when the distance is less than or equal to the first preset value, it moves to a position where the defect is located at Y. This precise positioning ensures that the defects can be accurately covered by the crescent shears, improving the accuracy of the shearing operation.

[0045] Among them, the first marking line W, the second marking line Y, and the third marking line Z can be illuminated by infrared light. Taking the blade of the crescent shears as a reference, the position of the first marking line W is first found, and then the positions of the second marking line Y and the third marking line Z are set according to the moving direction of the strip. The second marking line Y is located in front of the third marking line Z in the moving direction of the strip.

[0046] To make identification easier, the first marking line W, the second marking line Y, and the third marking line Z can be illuminated with different lights. This allows operators to more intuitively judge the positional relationship between defects and marking lines when manually moving the strip.

[0047] In one embodiment, if the distance between two adjacent defects is greater than a first preset value, the strip will stop moving when the defect is located at the first marking line.

[0048] By uniformly locating defects at the first marked line for cutting, the deviation in cutting position caused by different stopping points is reduced. This helps ensure that each cut accurately covers the defect, improving the stability and consistency of cutting, thereby enhancing product quality.

[0049] In one embodiment, the maximum feed distance of the crescent shears is 150 mm, and the preset feed distance of the crescent shears is 150 mm. When the distance between the defect and the edge of the strip is greater than a second preset value and less than or equal to a third preset value, the second feed distance of the crescent shears is the third preset value minus the first preset value, where the third preset value is less than or equal to 180 mm.

[0050] Both the maximum and preset feed distances of the crescent-shaped shears are 150mm. This setting allows the crescent-shaped shears to fully utilize their performance during normal cutting operations. Meanwhile, adjustments to the second feed distance for specific defect situations avoid unnecessary feed waste and improve equipment utilization.

[0051] In one embodiment, the actual cutting range L of the crescent-shaped scissors is 400 mm, and the constant x is greater than or equal to 25 mm and less than 50 mm.

[0052] The range of values ​​for the constant x (25mm ≤ x < 50mm) provides flexibility for adjusting the shearing strategy. In actual production, different strip specifications, materials, and product quality requirements may have different demands on shearing accuracy and efficiency. By adjusting the value of x, the actual shearing parameters of the crescent shear can be changed (such as L = h - 2x mentioned earlier), thereby adapting to different production needs.

[0053] A smaller x-value will make the actual shearing range closer to the width h of the straight section of the crescent shear, potentially improving shearing accuracy but limiting the flexibility of the shearing operation. A larger x-value, on the other hand, will widen the gap between the actual shearing range and h, potentially sacrificing some accuracy for higher efficiency while maintaining a certain shearing range. Therefore, choosing an appropriate x-value based on the actual situation can strike a balance between shearing accuracy and efficiency.

[0054] In one embodiment, the fourth preset value is 950 mm.

[0055] By setting a reasonable fourth preset value (950mm) and comparing it with the third preset value, excessively deep crescent shearing can be effectively prevented. If the fourth preset value is too small, the crescent shear may penetrate too deeply into the strip, affecting its strength and structural stability. The setting of 950mm provides a reasonable upper limit for the shearing depth, ensuring that the strip retains sufficient strength after shearing.

[0056] If the fourth preset value is too large, the crescent shears may not be able to cover all defects during cutting, resulting in defect residue. The 950mm setting ensures that the crescent shears cut within a reasonable range, covering most defects and improving the efficiency and quality of defect handling.

[0057] The fourth preset value of 950mm strikes a balance between shearing depth and material utilization. It ensures effective shearing while avoiding material waste caused by over-shearing, thus helping to reduce production costs.

[0058] Through the above embodiments, this application has the following beneficial effects or advantages: The strip shearing method disclosed in this application, by setting a first preset value, a second preset value, a third preset value, and a fourth preset value, and adopting different shearing methods according to the distance between the defect and the edge of the strip and the interval distance between adjacent defects, enables operators to more accurately determine the defect position without repeated confirmation, thus improving the accuracy of shearing. Especially when producing narrow strip steel, it avoids the problem of inaccurate positioning caused by the operator's difficulty in visual inspection. For cases where the interval distance between adjacent defects is less than or equal to the first preset value, a large crescent is sheared by performing two consecutive shears along the length direction of the strip steel, avoiding the problem of discontinuous connection between crescents, reducing the occurrence of misaligned peaks, reducing damage to the rolls during rolling, and improving product quality. By setting a marking line, the stopping position of the strip steel movement is clearly defined, making the shearing process more standardized and regulated, further improving shearing efficiency and accuracy. At the same time, parameters such as the actual shearing range and maximum feed distance of the crescent shear are reasonably set to ensure the smooth progress of the shearing process.

[0059] This invention provides a specific shearing method and standard, giving operators a unified operational basis when dealing with defects of different types and locations, reducing the phenomenon of slowdown or machine stoppage in subsequent processes due to inconsistent operating techniques, and improving production efficiency.

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention have been clearly and completely described above with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0061] Therefore, the above detailed description of the embodiments of the invention disclosed in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0062] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0063] In the description of this invention, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0064] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0065] In this invention, unless otherwise expressly specified and limited, "above or below" a first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0066] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0067] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for shearing strip steel, characterized in that, Includes the following steps: Determine the distribution of the defects on the edge of the strip along the length of the strip. If the distance between two adjacent defects is greater than a first preset value, then use crescent shears to cut each defect individually. If the distance between two adjacent defects is less than or equal to the first preset value, then use crescent shears to cut two consecutive cuts along the length of the strip to cut a large crescent at the location of the two defects. Determine the distance between the defect on the edge of the strip and the edge of the strip. If the distance between the defect and the edge of the strip is less than or equal to a second preset value, then the defect is directly sheared.

2. The strip shearing method according to claim 1, characterized in that, If the distance between the defect and the edge of the strip is greater than the second preset value and less than or equal to the third preset value, then the width of the strip is determined. If the width of the strip is greater than or equal to the fourth preset value, then the crescent shears are ordered to perform two consecutive cuts along the width direction of the strip to remove the defect. If the width of the strip is less than the fourth preset value, the defect will not be processed.

3. The strip shearing method according to claim 2, characterized in that, If the distance between the defect and the edge of the strip is greater than the second preset value and less than or equal to the third preset value, the width of the strip is greater than or equal to the fourth preset value, and the distance between two adjacent defects is less than or equal to the first preset value, then the crescent shears will first perform two consecutive cuts along the width direction of the strip, and then the strip will be moved to the actual cutting range of the crescent shears, and the crescent shears will again perform two consecutive cuts along the width direction of the strip.

4. The strip shearing method according to claim 3, characterized in that, The second preset value is the same as the maximum feed distance of the crescent shears.

5. The strip shearing method according to claim 3, characterized in that, The first preset value is twice the actual cutting range of the crescent-shaped scissors.

6. The strip shearing method according to claim 5, characterized in that, Measure the maximum width H of the crescent shears, measure the width h of the straight section of the crescent shears, and set the actual cutting range L of the crescent shears, L = h - 2x, where x is a manually set constant; Set the first label line W, with the position of W = H / 2; set the second label line Y, with the distance between Y and W being Y = W + L / 2; set the third label line Z, with the distance between Z and W being Z = WL / 2. If the distance between two adjacent defects is greater than the first preset value, the strip will stop moving when the defect is located between the second and third marking lines. If the distance between two adjacent defects is less than or equal to the first preset value, the strip will stop moving when the defect is located at the second marking line.

7. The strip shearing method according to claim 6, characterized in that, If the distance between two adjacent defects is greater than a first preset value, the strip will stop moving when the defect is located at the first marking line.

8. The strip shearing method according to claim 6, characterized in that, The maximum feed distance of the crescent shear is 150mm, and the preset feed distance of the crescent shear is 150mm. When the distance between the defect and the edge of the strip is greater than the second preset value and less than or equal to the third preset value, the second feed distance of the crescent shear is the third preset value minus the first preset value, and the third preset value is less than or equal to 180mm.

9. The strip shearing method according to claim 6, characterized in that, The actual cutting range L of the crescent-shaped shears is 400mm, and the constant x is greater than or equal to 25mm and less than 50mm.

10. The strip shearing method according to claim 6, characterized in that, The fourth preset value is 950mm.

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