Method and device for shearing control of strip steel

Abstract

The application discloses a strip steel shearing control method and device, and the control method comprises the following steps: obtaining the shearing length and burr height of the sheared strip steel of a disc shearing machine; obtaining the thickness and yield strength of the to-be-sheared strip steel; obtaining the disc gap and disc overlap of the disc shearing machine according to the shearing length, the burr height, the thickness and the yield strength; and controlling the disc shearing machine to shear the to-be-sheared strip steel according to the disc gap and the disc overlap. The control method can make the disc gap and the disc overlap more accurate, control the disc shearing machine to shear the to-be-sheared strip steel, reduce the burr defect rate from 5% to below 1%, increase the cut edge qualified rate from 80% to above 90%, reduce the height of the edge folding area of the strip steel end surface after cutting to 60 microns from 80 microns, and greatly improve the shearing quality of the strip steel.

Description

Technical Field

[0001] This application relates to the technical field of strip shearing control, and more particularly to a method and apparatus for strip shearing control. Background Technology

[0002] After continuous annealing, cold-rolled strip steel needs to be sheared at the edges using a disc shear. This serves two purposes: firstly, to precisely control the strip width according to order requirements, and secondly, to remove edge defects. The parameter settings and control precision of the disc shear equipment significantly impact the shearing quality and the stable operation of the equipment. The lower the strength of the strip steel itself, the more prone it is to edge burr defects during the shearing process; conversely, the higher the strength, the more prone it is to edge cracking defects.

[0003] Therefore, how to improve the shearing quality of strip steel is a technical problem that urgently needs to be solved. Summary of the Invention

[0004] The present invention provides a method and apparatus for controlling the shearing of strip steel, which can improve the shearing quality of strip steel.

[0005] The embodiments of the present invention provide the following solutions:

[0006] In a first aspect, embodiments of the present invention provide a method for controlling the shearing of strip steel, characterized in that it includes:

[0007] Obtain the shearing length and burr height of the strip steel in the history of disc shearing;

[0008] Obtain the strip thickness and yield strength of the strip to be sheared;

[0009] The blade clearance and blade overlap of the disc shear are obtained based on the shearing length, the burr height, the strip thickness, and the yield strength.

[0010] The disc shear is controlled to cut the strip steel to be cut based on the cutter head gap and the cutter head overlap.

[0011] In one optional embodiment, obtaining the blade clearance of the disc shear based on the shearing length, the burr height, the strip thickness, and the yield strength includes:

[0012] The first gap coefficient is obtained based on the shear length, the strip thickness, and the yield strength;

[0013] The second gap coefficient is obtained based on the shearing length, the burr height, the strip thickness, and the yield strength.

[0014] The cutter head clearance GAP is obtained according to the formula GAP = a × h + b, where a is the first clearance coefficient, h is the strip thickness, and b is the second clearance coefficient.

[0015] In an optional embodiment, obtaining the first gap coefficient based on the shear length, the strip thickness, and the yield strength includes:

[0016] The first sub-coefficient is determined based on the preset coefficient corresponding to the strength grade in which the yield strength is located;

[0017] The second sub-coefficient is determined based on the preset coefficient corresponding to the thickness range of the strip thickness;

[0018] The third sub-coefficient is determined based on the preset coefficient corresponding to the length interval in which the shearing length is located;

[0019] The first gap coefficient a is obtained according to the formula a = a1 × a2 × a3, where a1 is the first sub-coefficient, a2 is the second sub-coefficient, and a3 is the third sub-coefficient.

[0020] In an optional embodiment, obtaining the second gap coefficient based on the shear length, the burr height, the strip thickness, and the yield strength includes:

[0021] The fourth sub-coefficient is obtained based on the preset coefficients corresponding to the yield strength and the strip thickness;

[0022] The fifth sub-coefficient is obtained based on the preset coefficients corresponding to the shear length and the yield strength;

[0023] The sixth sub-coefficient is obtained based on the preset coefficients corresponding to the burr height and the yield strength;

[0024] The second gap coefficient b is obtained according to the formula b = b1 - b2 - b3, where b1 is the fourth sub-coefficient, b2 is the fifth sub-coefficient, and b3 is the sixth sub-coefficient.

[0025] In one optional embodiment, obtaining the overlap of the disc cutters of the circular shear based on the shearing length, the burr height, the strip thickness, and the yield strength includes:

[0026] The first overlap coefficient is obtained based on the shearing length and the strip thickness;

[0027] The second overlap coefficient is obtained based on the shearing length, the burr height, and the strip thickness;

[0028] The overlap amount LAP of the cutter head is obtained according to the formula LAP = c × h + d, where c is the first overlap coefficient, h is the strip thickness, and d is the second overlap coefficient.

[0029] In one optional embodiment, obtaining the first coincidence coefficient based on the shearing length and the strip thickness includes:

[0030] The seventh sub-coefficient is determined based on the preset coefficient corresponding to the thickness range of the strip thickness;

[0031] The eighth sub-coefficient is determined based on the preset coefficient corresponding to the length range in which the shearing length is located;

[0032] According to the formula c = c1 × c2, the first coincidence coefficient c is obtained, where c1 is the seventh sub-coefficient and c2 is the eighth sub-coefficient.

[0033] In one optional embodiment, obtaining the second coincidence coefficient based on the shearing length, the burr height, and the strip thickness includes:

[0034] The ninth sub-coefficient is determined based on the preset coefficient corresponding to the thickness range of the strip thickness.

[0035] The tenth sub-coefficient is determined based on the preset coefficient corresponding to the length interval in which the shearing length is located;

[0036] The eleventh sub-coefficient is determined based on the preset coefficient corresponding to the height range where the burr height is located;

[0037] The second coincidence coefficient d is obtained according to the formula d = d1 × d2 × d3, where d1 is the ninth sub-coefficient, d2 is the tenth sub-coefficient, and d3 is the eleventh sub-coefficient.

[0038] Secondly, embodiments of the present invention also provide a strip shearing control device, comprising:

[0039] The first acquisition module is used to acquire the shearing length and burr height of the strip steel in the history of disc shearing;

[0040] The second acquisition module is used to acquire the strip thickness and yield strength of the strip to be sheared;

[0041] The module is used to obtain the blade clearance and blade overlap of the disc shear based on the shearing length, the burr height, the strip thickness and the yield strength.

[0042] The control module is used to control the disc shear to cut the strip steel to be cut based on the cutter head gap and the cutter head overlap.

[0043] Thirdly, embodiments of the present invention also provide an electronic device, including a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of any of the methods described in the first aspect.

[0044] Fourthly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described in any one of the first aspects.

[0045] The shearing control method and apparatus for steel strip provided by this invention have the following advantages compared with the prior art:

[0046] This invention obtains the shearing length and burr height of historical strip steel cut by a disc shear, as well as the strip thickness and yield strength of the strip to be cut. The sharpness of the disc shear can be determined by the shearing length and burr height. Based on the shearing length, burr height, strip thickness, and yield strength, the disc shear's blade clearance and blade overlap are comprehensively calculated, making the blade clearance and blade overlap more precise. This controls the disc shear's cutting of the strip steel, reducing the burr defect rate from 5% to below 1%, increasing the edge trimming qualification rate from 80% to over 90%, and reducing the burr height on the strip steel end face after trimming from 80μm to 60μm, thereby greatly improving the shearing quality of the strip steel. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 A flowchart illustrating a strip shearing control method provided in an embodiment of the present invention;

[0049] Figure 2 This is a schematic diagram of the cross-sectional structure of the strip after shearing, provided in an embodiment of the present invention.

[0050] Figure 3 This is a schematic diagram of the structure of the disc shears provided in an embodiment of the present invention;

[0051] Figure 4 The image shows the morphology of the strip after implementing the shear control method of this embodiment of the invention.

[0052] Figure 5 The image shows the topography of a strip without implementing the shear control method of this invention.

[0053] Figure 6 This is a schematic diagram of a strip shearing control device provided in an embodiment of the present invention.

[0054] Explanation of reference numerals in the attached diagram: 1-Upper cutter head, 2-Lower cutter head. Detailed Implementation

[0055] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the protection scope of the embodiments of the present invention.

[0056] Please see Figure 1 , Figure 1 A flowchart of a strip shearing control method provided in an embodiment of the present invention includes:

[0057] S11. Obtain the shearing length and burr height of the strip steel in the history of disc shearing.

[0058] Specifically, the shearing length is the total length of strip steel cut by the disc shear within one service cycle, measured in kilometers (km). After one service cycle, the shearing blade of the disc shear is ground once. The shearing length can be determined by sensors on the strip steel shearing production line.

[0059] During shearing, the disc shear moves in a circular motion at the same traction speed as the strip steel, forming a pair of blades without endpoints. The shearing process of the strip steel includes three stages: elastic deformation, plastic deformation, and fracture. After continuous return strip steel and galvanized strip steel products are sheared by the disc shear, the cross-section at the cut edge is not uniform, but is divided into four different regions, exhibiting different morphological characteristics. Please refer to [link / reference]. Figure 2 From top to bottom, the strip is divided into four zones: indentation zone L1, shearing zone L2, tearing zone L3, and burr zone L4. The indentation zone is characterized by a small rounded corner formed by the shearing edge during shearing; the shearing zone is characterized by uniform streaks along the thickness direction; the tearing zone is characterized by a rough cross-section; and the burr zone is characterized by burrs extending beyond the thickness, also known as the edge-cutting zone, with the burr height being the height of the burr zone. To achieve good shearing quality in strip steel, it is necessary to control the area ratio of the four zones, especially the shearing zone. Different steel grades have different requirements for controlling the shearing zone ratio. Generally speaking, the higher the strip steel strength, the lower the proportion of the shearing area to the total cross-sectional area. Taking carbon steel as an example, the shearing area should be controlled to occupy 2 / 5–1 / 2 of the total cross-sectional area.

[0060] The burr height of historical strip steel can be microscopically detected using machine vision equipment. It can be understood that, taking continuous shearing of the same type of strip steel as an example, as the shearing length increases, the sharpness of the cutting edge on the disc shear gradually decreases, and the burr height increases accordingly. Therefore, both the shearing length and the burr height can characterize the current sharpness of the disc shear cutting edge. After obtaining the shearing length and burr height, proceed to step S12.

[0061] S12. Obtain the strip thickness and yield strength of the strip to be sheared.

[0062] Specifically, the strip thickness can be determined through the production plan of the shearing line; yield strength is the yield limit of a metallic material when it yields, that is, the stress that resists slight plastic deformation. Different steel grades have corresponding yield strengths, and the yield strength of the strip to be sheared can be obtained by looking up the corresponding steel grade. After obtaining the strip thickness and yield strength, proceed to step S13. It can be understood that either step S12 or S13 can be executed first.

[0063] S13. Based on the shearing length, the burr height, the strip thickness, and the yield strength, obtain the blade clearance and blade overlap of the disc shear.

[0064] For details, please refer to Figure 3 The disc shear consists of an upper cutter head 1 and a lower cutter head 2. The cutter head gap is the horizontal gap between the upper and lower cutter heads, and the cutter head overlap is the vertical overlap distance between the upper and lower cutter heads. To avoid shearing defects in the strip steel, it is necessary to properly match the shearing parameters. Among these, the most important are the cutter head gap and the cutter head overlap. Moreover, the cutter head gap has a more sensitive impact on the edge quality of the cut steel coil than the cutter head overlap.

[0065] Typically, the cutter head clearance and overlap are set based on a single strip thickness as a reference. However, with variations in the sharpness of the shearing edge and the yield strength of the strip, the calculation of these parameters can easily become unreasonable, leading to shearing defects. The sharpness of the disc shear can be determined by the shearing length and burr height. The cutter head clearance and overlap are then determined by combining the sharpness, strip thickness, and yield strength. For example, by setting thresholds for shearing length and burr height, if either the shearing length or burr height exceeds its threshold, it indicates that the disc shear's sharpness is low. If the yield strength is high, the cutter head clearance and overlap determined by the strip thickness will be smaller than the conventional value; if the yield strength is low, the cutter head clearance and overlap determined by the strip thickness will be further reduced than the conventional value; conversely, the cutter head clearance and overlap will be increased compared to the conventional value.

[0066] Of course, the cutter head gap (GAP) can also be calculated using the formula GAP = ω1×h + ω2×h + ω3×h, where ω1 is the weighting coefficient for the cutter head gap corresponding to the shearing length, ω2 is the weighting coefficient for the cutter head gap corresponding to the burr height, ω3 is the weighting coefficient for the cutter head gap corresponding to the yield strength, and h is the strip thickness. The cutter head overlap (LAP) can be calculated using the formula LAP = ω4×h + ω5×h + ω6×h, where ω4 is the weighting coefficient for the cutter head overlap corresponding to the shearing length, ω5 is the weighting coefficient for the cutter head overlap corresponding to the burr height, ω6 is the weighting coefficient for the cutter head overlap corresponding to the yield strength, and h is the strip thickness. It is understood that each weighting coefficient can be set by the engineering experience of technical personnel or determined through calibration experiments. Based on the shearing length, burr height, strip thickness, and yield strength, the cutter head gap and cutter head overlap of the disc shear are comprehensively obtained, resulting in more accurate measurements.

[0067] In one specific implementation, the blade clearance of the disc shear is obtained based on the shearing length, burr height, strip thickness, and yield strength, including:

[0068] The first gap coefficient is obtained based on the shearing length, strip thickness, and yield strength; the second gap coefficient is obtained based on the shearing length, burr height, strip thickness, and yield strength; the cutter head gap GAP is obtained according to the formula GAP=a×h+b, where a is the first gap coefficient, h is the strip thickness, and b is the second gap coefficient.

[0069] Specifically, there are corresponding settings for shearing length, burr height, strip thickness, and yield strength with the cutter head gap. A longer shearing length likely indicates a less sharp cutting edge; to reduce substandard shearing quality, the cutter head gap can be reduced accordingly. Similarly, a larger burr height also suggests a less sharp cutting edge, requiring a corresponding reduction in the cutter head gap. A thicker strip corresponds to a larger cutter head gap, and a higher yield strength also corresponds to a larger cutter head gap. The first and second gap coefficients can be calculated using this correspondence, and then the cutter head gap GAP can be calculated accordingly.

[0070] In one specific implementation, the first gap coefficient is obtained based on the shear length, strip thickness, and yield strength, including:

[0071] The first sub-coefficient is determined based on the preset coefficient corresponding to the strength grade where the yield strength is located; the second sub-coefficient is determined based on the preset coefficient corresponding to the thickness range where the strip thickness is located; the third sub-coefficient is determined based on the preset coefficient corresponding to the length range where the shear length is located; the first gap coefficient a is obtained according to the formula a=a1×a2×a3, where a1 is the first sub-coefficient, a2 is the second sub-coefficient, and a3 is the third sub-coefficient.

[0072] Specifically, the strength of the strip steel has a significant impact on shearing parameters and shearing quality. Lower strip steel strength makes burr defects more likely to appear after shearing; conversely, higher strip steel strength makes it more prone to blade breakage in the disc shear or edge cracking during shearing. Therefore, both need to be controlled separately. To ensure good shearing quality, strip steel is classified into three types: low strength, medium strength, and high strength. Strength grades can be further categorized based on the steel composition. Taking continuously annealed and galvanized strip steel as examples, the strength classification can be found in Table 1.

[0073] Table 1:

[0074]

[0075]

[0076] The thicker the strip, the greater the shearing force required, and the more prone it is to blade breakage or strip cracking; the thinner the strip, the less shearing force is required, but the more prone it is to edge burr defects. To ensure good shearing quality, thickness ranges were defined based on the cutter head gap and cutter head overlap, as shown in Table 2.

[0077] Table 2:

[0078]

[0079] Within a service life of a disc shear, the sharpness of the blade gradually decreases with increasing cutting mileage, leading to an increase in the edge-clamping area after strip cutting, and consequently increasing the probability of burr defects appearing in the strip later. Therefore, to ensure sufficiently good cutting quality, different combinations of cutting parameters need to be used within a service life of the disc shear. To ensure the accuracy of the cutting formula and good cutting quality, a service life of the disc shear is divided into three segments based on the cutting length: 0-20km, 20-80km, and 80-120km.

[0080] Strip steel mainly includes two types: continuous annealing (or continuous annealing) and galvanizing. For strip steel of the same strength grade, continuous annealing and galvanizing products have different composition designs and process flows. Therefore, shearing parameters need to be formulated separately. Taking continuously annealed strip steel as an example, the first sub-coefficient a1, the second sub-coefficient a2, and the third sub-coefficient a3 can be set using the corresponding data in Table 3.

[0081] Table 3:

[0082]

[0083] Taking galvanized steel strip as an example, the first sub-coefficient a1, the second sub-coefficient a2, and the third sub-coefficient a3 can be set using the data in Table 4.

[0084] Table 4:

[0085]

[0086]

[0087] After determining the first sub-coefficient a1, the second sub-coefficient a2, and the third sub-coefficient a3, the first gap coefficient a is obtained according to the formula a = a1 × a2 × a3.

[0088] In one specific implementation, the second gap coefficient is obtained based on the shear length, burr height, strip thickness, and yield strength, including:

[0089] The fourth sub-coefficient is obtained based on the preset coefficients corresponding to the yield strength and strip thickness; the fifth sub-coefficient is obtained based on the preset coefficients corresponding to the shear length and yield strength; the sixth sub-coefficient is obtained based on the preset coefficients corresponding to the burr height and yield strength; and the second gap coefficient b is obtained based on the formula b = b1 - b2 - b3, where b1 is the fourth sub-coefficient, b2 is the fifth sub-coefficient, and b3 is the sixth sub-coefficient.

[0090] Specifically, disc shears are typically driven by a motor, making it impossible to directly monitor changes in shearing force and the sharpness of the blades during the shearing process. This embodiment proposes using the height of the burr area on the rear end face of the strip cutter to indirectly reflect the sharpness of the blades, and adjusting the blade clearance and blade overlap based on the burr height to ensure good shearing quality.

[0091] To ensure the accuracy of the second gap coefficient calculation, the burr height is observed through an optical magnifying glass. Based on the distribution characteristics of the burrs, the burr height can be divided into three intervals: less than 20μm, 20-40μm, and greater than 40μm. Each interval corresponds to a preset sub-coefficient.

[0092] Taking continuously annealed strip steel as an example, please refer to Table 5. The fourth sub-coefficient b1 can be obtained based on the preset coefficients corresponding to the yield strength and strip thickness.

[0093] Table 5:

[0094]

[0095] Taking galvanized steel strip as an example, please refer to Table 6. The fourth sub-coefficient b1 can be obtained based on the preset coefficients corresponding to the yield strength and the steel strip thickness.

[0096] Table 6:

[0097]

[0098]

[0099] Taking continuously annealed and galvanized strip steel as an example, please refer to Table 7. Based on the preset coefficients corresponding to shear length and yield strength, the fifth sub-coefficient b2 is obtained; based on the preset coefficients corresponding to burr height and yield strength, the sixth sub-coefficient b3 is obtained.

[0100] Table 7:

[0101]

[0102] After obtaining the fourth sub-coefficient b1, the fifth sub-coefficient b2, and the sixth sub-coefficient b3, the second gap coefficient b is obtained according to the formula b = b1 - b2 - b3.

[0103] In one specific implementation, the overlap of the disc shear blades is obtained based on the shearing length, burr height, strip thickness, and yield strength, including:

[0104] The first overlap coefficient is obtained based on the shearing length and strip thickness; the second overlap coefficient is obtained based on the shearing length, burr height and strip thickness; the cutter head overlap amount LAP is obtained according to the formula LAP=c×h+d, where c is the first overlap coefficient, h is the strip thickness and d is the second overlap coefficient.

[0105] Specifically, the shearing length, burr height, strip thickness, and yield strength are all related to the overlap of the cutter head. Based on this relationship, the first overlap coefficient c and the second overlap coefficient d can be determined, and then the overlap of the cutter head LAP can be calculated accordingly.

[0106] In one specific implementation, obtaining the first overlap factor based on the shear length and strip thickness includes:

[0107] The seventh sub-coefficient is determined based on the preset coefficient corresponding to the thickness range of the strip thickness; the eighth sub-coefficient is determined based on the preset coefficient corresponding to the length range of the shearing length; the first coincidence coefficient c is obtained according to the formula c = c1 × c2, where c1 is the seventh sub-coefficient and c2 is the eighth sub-coefficient.

[0108] Specifically, taking continuously annealed strip steel as an example, please refer to Table 8. The seventh sub-coefficient c1 and the eighth sub-coefficient c2 can be determined based on the correspondence between each coefficient and the strip thickness and cutting length.

[0109] Table 8:

[0110]

[0111] Taking galvanized steel strip as an example, please refer to Table 9. The seventh sub-coefficient c1 and the eighth sub-coefficient c2 can be determined based on the correspondence between each coefficient and the steel strip thickness and cutting length.

[0112] Table 9:

[0113]

[0114] In one specific implementation, the second overlap coefficient is obtained based on the shear length, burr height, and strip thickness, including:

[0115] The ninth sub-coefficient is determined based on the preset coefficient corresponding to the thickness range of the strip thickness; the tenth sub-coefficient is determined based on the preset coefficient corresponding to the length range of the shearing length; the eleventh sub-coefficient is determined based on the preset coefficient corresponding to the height range of the burr height; the second coincidence coefficient d is obtained according to the formula d=d1×d2×d3, where d1 is the ninth sub-coefficient, d2 is the tenth sub-coefficient, and d3 is the eleventh sub-coefficient.

[0116] Specifically, taking continuously annealed strip steel as an example, please refer to Table 10. Based on the correspondence between each coefficient and strip steel thickness, cutting length and burr height, the ninth sub-coefficient d1, the tenth sub-coefficient d2 and the eleventh sub-coefficient d3 can be determined.

[0117] Table 10:

[0118]

[0119]

[0120] Taking galvanized steel strip as an example, please refer to Table 11. Based on the correspondence between each coefficient and the steel strip thickness, cutting length and burr height, the ninth sub-coefficient d1, the tenth sub-coefficient d2 and the eleventh sub-coefficient d3 can be determined.

[0121] Table 11:

[0122]

[0123] The tool head clearance and tool head overlap are accurately calculated using the determined coefficients. After obtaining the tool head clearance and tool head overlap, proceed to step S14.

[0124] S14. Control the disc shear to cut the strip steel to be cut according to the cutter head gap and the cutter head overlap.

[0125] Specifically, by controlling the cutter head gap and the cutter head overlap, the disc shear can be positioned at the target location, and its circumferential rotation can be controlled to achieve the same traction speed as the strip steel, thus significantly improving the shearing quality. For example, if the disc shear achieves a shearing length of 120km in a certain cycle, please refer to [link to relevant documentation]. Figure 4The burr height at point A1 is 58.4 μm, at point A2 it is 59.5 μm, and at point A3 it is 59.2 μm. Before employing the shear control method of this embodiment, the cross-sectional morphology of the strip steel after a shearing length of 120 km is shown in the attached diagram. Figure 5 The burr height at point B1 is 89.2 μm, the burr height at point B2 is 87.0 μm, and the burr height at point B3 is 84.4 μm. It can be seen that after implementing the shearing control method of this embodiment, the burr height is significantly reduced, greatly improving the shearing quality of the strip.

[0126] Example 1: To further verify the shear control method of the present invention, taking 0.5mmSPHC, 1.0mmSPHC, 0.5mmDC01 and 1.0mmDC01 continuous annealing products as examples, the occurrence rate of edge burrs in medium strength series continuous annealing products was verified. The occurrence rate of edge burr defects of strip steel before and after the application of this patent was statistically analyzed, as shown in Table 12.

[0127] Table 12. Occurrence rate of edge burr defects after trimming in medium-grade continuous annealing products.

[0128]

[0129] As can be seen from the comparison, after the shearing control method of the present invention is applied, the incidence of edge burr defects after shearing of both types of steel products is reduced to less than 1%.

[0130] Example 2: Taking 0.6mm DX51 D+Z, 1.2mm DX51 D+Z, 0.6mm DX52 D+Z and 1.2mm DX52 D+Z galvanized products as examples, the occurrence rate of edge burrs in the medium strength series of galvanized products was verified. The occurrence rate of edge burrs before and after the application of this patent was statistically analyzed, as shown in Table 13.

[0131] Table 13. Burr Occurrence Rate of Medium-Strength Galvanized Products

[0132]

[0133] As can be seen from the comparison, after the shearing control method of the present invention is applied, the incidence of edge burr defects after shearing of galvanized products of both types of steel is reduced to below 0.8%.

[0134] Example 3: Please continue reading Figure 4-5 Taking the 0.6mm DX52D+Z galvanized product as an example, the height of the edge-fastening area on the rear end face of the medium-strength series galvanized product was verified. Similarly, after the cutting mileage reached 120km, the morphology and height of the edge-fastening area on the rear end face of the strip steel before and after adopting this patent were compared.

[0135] As can be seen from the comparison, after the shear control method of the present invention is applied, the burr height of the strip cross-section is reduced from 84-89μm to 58-59μm after the shearing mileage reaches 120km.

[0136] Example 4: Taking 0.8mm DP590, 1.5mm DP590, 0.8mm DP780 and 1.5mm DP780 continuous annealing products as examples, the edge trimming qualification rate of the high-strength series continuous annealing products was verified, and the shearing qualification rate before and after the application of this patent was statistically analyzed, as shown in Table 14.

[0137] Table 14: Edge Cutting Qualification Rate of High-Strength Series Continuous Annealing Products

[0138]

[0139] As can be seen from the comparison, after applying the shearing control method of the present invention, the edge trimming qualification rate of DP590 and DP780 continuous retraction products has been increased to over 90%.

[0140] Example 5: Taking 1.0mm DP590+Z, 1.6mm DP590+Z, 0.8mm DP780+Z and 1.6mm DP780+Z galvanized products as examples, the edge trimming qualification rate of high-strength series galvanized products is verified.

[0141] The shearing qualification rate before and after the application of this patent was statistically analyzed, as shown in Table 15.

[0142] Table 15: Edge Cutting Qualification Rate of High-Strength Series Continuous Annealing Products

[0143]

[0144] As can be seen from the comparison, after applying the shearing control method of the present invention, the edge trimming qualification rate of DP590+Z and DP780+Z galvanized products has been increased to over 90%.

[0145] Based on the same inventive concept as the control method, embodiments of the present invention also provide a strip shearing control device. Please refer to [link to relevant documentation]. Figure 6 ,include:

[0146] The first acquisition module 601 is used to acquire the shearing length and burr height of the strip steel in the history of the disc shear.

[0147] The second acquisition module 602 is used to acquire the strip thickness and yield strength of the strip to be sheared;

[0148] The module 603 is used to obtain the blade clearance and blade overlap of the disc shear based on the shearing length, the burr height, the strip thickness and the yield strength.

[0149] The control module 604 is used to control the disc shear to cut the strip steel to be cut based on the cutter head gap and the cutter head overlap.

[0150] Based on the same inventive concept as the control method, embodiments of the present invention also provide an electronic device, including a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform any of the steps of the method described.

[0151] Based on the same inventive concept as the control method, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described herein.

[0152] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0153] By acquiring the shearing length and burr height of the strip steel from the history of the disc shear, as well as the strip thickness and yield strength of the strip steel to be sheared, the sharpness of the disc shear can be determined through the shearing length and burr height. Based on the shearing length, burr height, strip thickness, and yield strength, the disc shear's blade clearance and blade overlap are comprehensively calculated, making the blade clearance and blade overlap more precise. By controlling the disc shear to shear the strip steel, the burr defect rate has been reduced from 5% to below 1%, the edge trimming qualification rate has been increased from 80% to over 90%, and the burr height on the strip steel end face after edge trimming has been reduced from 80μm to 60μm, thereby greatly improving the shearing quality of the strip steel.

[0154] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (modules, systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0155] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0156] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0157] Although preferred embodiments of the invention 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 both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0158] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for controlling the shearing of steel strip, characterized in that, include: Obtain the shearing length and burr height of the strip steel in the history of disc shearing; Obtain the strip thickness and yield strength of the strip to be sheared; The first gap coefficient is obtained based on the shear length, the strip thickness, and the yield strength; The second gap coefficient is obtained based on the shearing length, the burr height, the strip thickness, and the yield strength. The cutter head clearance GAP is obtained according to the formula GAP=a×h+b, where a is the first clearance coefficient, h is the strip thickness, and b is the second clearance coefficient. The overlap of the blades of the disc shear is obtained based on the shearing length, the burr height, the strip thickness, and the yield strength. The disc shear is controlled to cut the strip steel to be cut based on the cutter head gap and the cutter head overlap.

2. The strip shearing control method according to claim 1, characterized in that, The step of obtaining the first gap coefficient based on the shear length, the strip thickness, and the yield strength includes: The first sub-coefficient is determined based on the preset coefficient corresponding to the strength grade in which the yield strength is located; The second sub-coefficient is determined based on the preset coefficient corresponding to the thickness range of the strip thickness; The third sub-coefficient is determined based on the preset coefficient corresponding to the length range in which the shearing length is located; The first gap coefficient a is obtained according to the formula a = a1 × a2 × a3, where a1 is the first sub-coefficient, a2 is the second sub-coefficient, and a3 is the third sub-coefficient.

3. The strip shearing control method according to claim 1, characterized in that, The step of obtaining the second gap coefficient based on the shear length, the burr height, the strip thickness, and the yield strength includes: The fourth sub-coefficient is obtained based on the preset coefficients corresponding to the yield strength and the strip thickness; The fifth sub-coefficient is obtained based on the preset coefficients corresponding to the shear length and the yield strength; The sixth sub-coefficient is obtained based on the preset coefficients corresponding to the burr height and the yield strength; The second gap coefficient b is obtained according to the formula b = b1 - b2 - b3, where b1 is the fourth sub-coefficient, b2 is the fifth sub-coefficient, and b3 is the sixth sub-coefficient.

4. The strip shearing control method according to claim 1, characterized in that, The step of obtaining the overlap of the blades of the disc shear based on the shearing length, the burr height, the strip thickness, and the yield strength includes: The first overlap coefficient is obtained based on the shearing length and the strip thickness; The second overlap coefficient is obtained based on the shearing length, the burr height, and the strip thickness; The overlap amount LAP of the cutter head is obtained according to the formula LAP = c × h + d, where c is the first overlap coefficient, h is the strip thickness, and d is the second overlap coefficient.

5. The strip shearing control method according to claim 4, characterized in that, The step of obtaining the first coincidence coefficient based on the shearing length and the strip thickness includes: The seventh sub-coefficient is determined based on the preset coefficient corresponding to the thickness range of the strip thickness; The eighth sub-coefficient is determined based on the preset coefficient corresponding to the length range in which the shearing length is located; According to the formula c = c1 × c2, the first coincidence coefficient c is obtained, where c1 is the seventh sub-coefficient and c2 is the eighth sub-coefficient.

6. The strip shearing control method according to claim 4, characterized in that, The step of obtaining the second coincidence coefficient based on the shearing length, the burr height, and the strip thickness includes: The ninth sub-coefficient is determined based on the preset coefficient corresponding to the thickness range of the strip thickness. The tenth sub-coefficient is determined based on the preset coefficient corresponding to the length interval in which the shearing length is located; The eleventh sub-coefficient is determined based on the preset coefficient corresponding to the height range where the burr height is located; The second coincidence coefficient d is obtained according to the formula d = d1 × d2 × d3, where d1 is the ninth sub-coefficient, d2 is the tenth sub-coefficient, and d3 is the eleventh sub-coefficient.

7. A strip steel shearing control device, characterized in that, include: The first acquisition module is used to acquire the shearing length and burr height of the strip steel in the history of disc shearing; The second acquisition module is used to acquire the strip thickness and yield strength of the strip to be sheared; The module is used to obtain the blade clearance and blade overlap of the disc shear based on the shearing length, the burr height, the strip thickness and the yield strength. A control module is used to control the disc shear to cut the strip steel to be cut according to the cutter head gap and the cutter head overlap amount. The device is capable of performing the steps of the strip steel cutting control method as described in any one of claims 1-6.

8. An electronic device, characterized in that, The device includes a processor and a memory, the memory being coupled to the processor, the memory storing instructions that, when executed by the processor, cause the electronic device to perform the steps of the method according to any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the method described in any one of claims 1-6.

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