Device and method for improving consistency of nick quality of oriented silicon steel

Abstract

The invention belongs to the technical field of oriented silicon steel laser nick processing, and particularly relates to a device and method for improving the nick quality consistency of oriented silicon steel. The device comprises a conveying mechanism, a shape correcting mechanism and a laser scanning system. The at least two groups of shape righting mechanisms are arranged between the conveying mechanisms, each shape righting mechanism comprises a convex roller and a concave roller which are matched with each other, the convex rollers and the concave rollers are of rotary body structures, and a gap for the oriented silicon steel strip to pass through is reserved between each convex roller and the corresponding concave roller. The shape correction roller with the special-shaped structure is used for correcting the steel belt in the width direction according to the specific curvature, and the defect that when a high-rotating-speed rotating mirror scans, due to the fact that laser beams are in the width direction of the steel belt, the light spot size and the scanning speed change, large energy density difference is caused is overcome; therefore, the oriented silicon steel obtains uniform nicking morphology and iron loss reduction effect in the width direction, and the product quality consistency of oriented silicon steel laser nicking is improved on the whole.

Description

Technical Field

[0001] The invention belongs to the technical field of laser scoring of oriented silicon steel, and in particular relates to a device and a method for improving the consistency of scoring quality of oriented silicon steel. Background Art

[0002] Laser scoring technology for oriented silicon steel utilizes the high energy density of the laser beam, perpendicular to the rolling direction (RD) of the silicon steel strip, to form laser lines with a specific spacing at a certain laser power and scanning speed, so that the local area on the surface of the material is subjected to instantaneous thermal stress and undergoes plastic deformation. The residual stress generated in the micro-area is used to control the magnetic domain morphology, thereby achieving the purpose of reducing the abnormal eddy current loss of the silicon steel sheet. The application of this technology can further reduce the core loss, which is of great significance for achieving the low-carbon and energy-saving development goals of the power industry.

[0003] At present, the industry mainly uses mechanical scanning mirrors to control the laser scanning path. Because the multi-faceted prism rotates at a high speed, the scanning speed of the light beam after reflection is extremely fast. Compared with galvanometer scanning, it has the advantages of large scanning angle, wide scanning path range, and high speed stability. It greatly improves the production efficiency of silicon steel laser scoring and is widely used in wide-format oriented silicon steel laser scoring. However, when using a rotating mirror for scanning, on the one hand, after the laser beam is reflected by the uniformly rotating mirror, the scanning speed of each point in the scanning trajectory in the width direction of the steel strip is not the same. Especially in wide-format flat processing at a low working distance, the speed difference between the two ends of the scoring line and the middle is most obvious; on the other hand, the shape of the light spot on the surface of the steel strip changes with the angle between the incident laser beam and the plane. α The shape changes due to the change of the circular spot, which becomes elliptical when projected on the edge of the steel strip (such as Figure 1 As shown in the figure, the energy density at each position on each scoring line is not consistent, and the refining effect of the scoring magnetic domains varies greatly, resulting in a gradual decrease in the loss reduction effect of the scoring from the middle to the edge of the steel strip along the width direction, which seriously affects the consistency of silicon steel scoring quality and product stability.

[0004] In response to the problem of uneven laser energy during laser scoring, existing patent technologies mainly propose improvement measures from the aspects of laser beam systems and devices. Patent JP2000336430A discloses a method for controlling magnetic domains of oriented electrical steel sheets, which specifically arranges multiple pulsed lasers in the width direction of the sheet, and uses a laser irradiation method of a multi-stage array semiconductor laser and an integrated lens to obtain linear beams with equal intervals in the rolling direction; Patent JP2004122218A divides a laser source into multiple irradiation segments through a beam splitter, and then acts on the width direction of the steel sheet. Through the steel sheet moving speed, beam scanning speed, and laser power proportional increase and decrease device, the intervals of the scoring lines in the rolling direction are controlled to be consistent, providing a good magnetic performance effect.

[0005] Patent CN103596720A provides a manufacturing device and a manufacturing method for oriented silicon steel, which specifically provides a plurality of laser beam irradiation devices in the conveying direction of the steel plate, and a width direction moving mechanism that moves the laser beam irradiation device in the width direction of the steel plate, and adjusts the overlapping width of the adjacent laser irradiation lines in the width direction to control the magnetic area, thereby stabilizing the iron loss and magnetostrictive characteristics. This method needs to further eliminate the negative impact by adjusting the size of the overlapping area of ​​the scoring line.

[0006] Patent CN116475581A provides a method for laser scoring of silicon steel with unequal power in different zones. The oriented silicon steel strip is divided into three lateral zones in the horizontal direction. A laser head is set corresponding to each lateral zone. The laser scoring is performed on different zones using process schemes with different powers. While ensuring that the entire roll of oriented silicon steel strip can achieve significant scoring loss reduction effects, damage to the insulating coating can also be avoided or reduced. The problem of regional distribution characteristics in the lateral direction due to the grains and texture formed by secondary recrystallization and the coating coating process is solved, resulting in different magnetic properties in different zones.

[0007] The above methods can better control the uniformity between the rolling grooves. Among them, the array laser is used to decompose a single laser groove into several segments, which can eliminate the energy difference in different areas of each groove line. However, this method has extremely high requirements on the integration and stability of the device and optical path system. It is difficult to control the overlapping width of the adjacent laser irradiation lines in the width direction. The partitioned unequal power scoring method with multiple laser heads is used to improve the difference in the edge and middle states caused by the secondary crystallization of the steel strip annealing, but it cannot fundamentally solve the problem of uneven laser energy density caused by fluctuations in the spot scanning speed and spot shape. Summary of the invention

[0008] The present invention aims to solve the above-mentioned problem and provides a device and method for improving the consistency of the scoring quality of oriented silicon steel. It can fundamentally solve the phenomenon of uneven laser energy density caused by fluctuations in the spot scanning speed and spot shape, thereby improving the consistency of the scoring quality of oriented silicon steel.

[0009] According to the technical solution of the present invention, the device for improving the consistency of the scoring quality of oriented silicon steel comprises: A conveying mechanism, used for conveying oriented silicon steel strip; A correction mechanism, at least two groups, is arranged between the conveying mechanisms; the correction mechanism comprises a convex roller and a concave roller that cooperate with each other, the convex roller and the concave roller are a rotating body structure, and a gap is left between the convex roller and the concave roller for the oriented silicon steel strip to pass through; The laser scanning system is arranged just above the adjacent orthopedic structures and is used for laser scoring the oriented silicon steel strip.

[0010] Furthermore, the positions of the correction mechanism and the laser scanning system in the conveying direction of the oriented silicon steel strip can be adjusted.

[0011] Further, it also includes a testing agency and a control agency; The detection mechanism is arranged between adjacent corrective mechanisms, and is used to detect the curvature of the oriented silicon steel strip between the adjacent corrective mechanisms, and transmit the signal to the control mechanism; The control mechanism is used to receive the signal from the detection mechanism, and control the position adjustment of the correction mechanism and the laser scanning system and the gap adjustment between the convex roller and the concave roller in the correction mechanism.

[0012] Furthermore, it also includes a tension compensation auxiliary mechanism, which is arranged between the transmission mechanism and the correction mechanism and is used to compensate for the tension during the transmission of the oriented silicon steel strip.

[0013] Furthermore, the tension force compensation auxiliary mechanism is a tension roller.

[0014] Furthermore, the generatrix length of the convex roller and the concave roller is l 'satisfy l '> l ,in l is the width of the oriented silicon steel strip; The absolute value of the generatrix curvature of the convex roller and the concave roller k Satisfy 0.9 / h ≤ k ≤1.1 / h ,in h is the working height of the laser scanning system, that is, the vertical distance from the laser scanning system to the oriented silicon steel strip.

[0015] Furthermore, the width of the oriented silicon steel strip is l 0.50 m-1.80 m; the working height of the laser scanning system h 0.75 m-2.70 m; the absolute value of the generatrix curvature of the convex roller and the concave roller k 0.33 m -1 -1.46 m -1 .

[0016] Furthermore, in the correction mechanism, the gap D between the convex roller and the concave roller is d 0+2∆ H 0; in, d 0 is the thickness of the oriented silicon steel strip; ∆ H0 is the longitudinal height fluctuation error, the value range is (10%-15%)× d 0.

[0017] Furthermore, the laser scanning system consists of two groups.

[0018] Another aspect of the present invention provides a method for improving the consistency of notch quality of oriented silicon steel, using the above device, comprising the following steps: During the conveying process of the oriented silicon steel strip, a correction mechanism is used to correct the strip, so that the oriented silicon steel strip is conveyed between the correction mechanisms at the corrected curvature; During the process of conveying the oriented silicon steel strip with the corrected curvature, a laser scanning system is used to laser score the oriented silicon steel strip in a rotating mirror scanning mode.

[0019] Furthermore, the curvature of the oriented silicon steel strip between adjacent corrective mechanisms is detected, and the position of the corrective mechanism and the laser scanning system in the conveying direction of the oriented silicon steel strip and the gap between the convex roller and the concave roller in the corrective mechanism are adjusted according to the detection results.

[0020] The technical solution of the present invention has the following advantages over the prior art: without changing the working mode of the laser scanning system, the present invention corrects the steel strip in the width direction according to a specific curvature through a correction roller (including a convex roller and a concave roller) with a special-shaped structure, thereby overcoming the large energy density difference caused by the change of the spot size and scanning speed of the laser beam in the width direction of the steel strip when the high-speed rotating mirror is scanned. Through the implementation of the present invention, the oriented silicon steel obtains a uniform scoring magnetic domain morphology and iron loss reduction effect in the width direction, which improves the product quality consistency of the oriented silicon steel laser scoring as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the beam scanning characteristics of existing laser scribing technology.

[0022] Figure 2 It is a schematic diagram of the structure of the device of the present invention.

[0023] Figure 3 Schematic diagram of the orthopedic mechanism of the present invention.

[0024] Figure 4 Schematic diagram of laser scoring lines based on the orthopedic control of the device of the present invention.

[0025] Figure 5 Schematic diagram of the relationship between the arc surface of the oriented silicon steel strip along the width direction and the position of the laser beam.

[0026] Figure 6 Schematic diagram of sampling for comparison of steel loss properties of oriented silicon steel.

[0027] Figure 7 The magnetic domain refinement morphology of the sampling point in comparative example 1 (Figure (a) corresponds to Figure 6 A3 position in the middle, Figure (b) corresponds to Figure 6 A1 position in the middle).

[0028] Figure 8 The magnetic domain refinement morphology of the sampling point in Example 1 (Figure (a) corresponds to Figure 6 A3 position in the middle, Figure (b) corresponds to Figure 6 A1 position in the middle).

[0029] Explanation of the accompanying drawings: 1-oriented silicon steel strip, 2-correction mechanism, 2.1-convex roller, 2.2-concave roller, 3-laser scanning system, 4-detection mechanism, 5-tensioning force compensation auxiliary mechanism, 6-laser scoring chamber, 7-transmission mechanism. DETAILED DESCRIPTION

[0030] In view of the fact that the prior art cannot fundamentally solve the problem of uneven laser energy density caused by fluctuations in spot scanning speed and spot shape, the present invention proposes a device and method for improving the consistency of the scoring quality of oriented silicon steel. The curvature parameters of the oriented silicon steel strip shape are corrected to ensure that scoring lines arranged at equal intervals perpendicular to the rolling direction are formed on the silicon steel surface, and the laser energy density at each scoring line is consistent. The device is suitable for an oriented silicon steel laser scoring system using a high-speed scanning rotating mirror, and can effectively improve the consistency and stability of the laser scoring quality of oriented silicon steel products.

[0031] like Figure 2 As shown, the device for improving the consistency of the scoring quality of oriented silicon steel of the present invention comprises: a conveying mechanism 7, a correction mechanism 2 and a laser scanning system 3.

[0032] Among them, the conveying mechanism 7 is used to convey the oriented silicon steel strip 1, and a laser scoring chamber 6 is formed between the conveying mechanisms 7. There are at least two groups of corrective mechanisms 2, which are arranged between the conveying mechanisms 7 and located in the laser scoring chamber 6, and are used to correct the oriented silicon steel strip 1. The corrective mechanism 2 includes a convex roller 2.1 and a concave roller 2.2 that cooperate with each other. The convex roller 2.1 and the concave roller 2.2 are rotating body structures, and a gap is left between the convex roller 2.1 and the concave roller 2.2 for the oriented silicon steel strip 1 to pass through. During laser scoring, the oriented silicon steel strip 1 passes through the gap between the convex roller 2.1 and the concave roller 2.2 horizontally at a uniform speed, undergoes elastic deformation, and meets the curvature in the plate width direction required by the scoring area.

[0033] like Figure 3 As shown, the rotation axes of the convex roller 2.1 and the concave roller 2.2 are placed in the same vertical plane, and the convex roller 2.1 is placed above the concave roller 2.2. To ensure the correction effect, the generatrix length of the convex roller 2.1 and the concave roller 2.2 isl 'Greater than the width of the oriented silicon steel strip 1 l The absolute value of the generatrix curvature of the convex roller 2.1 and the concave roller 2.2 is k Satisfy 0.9 / h ≤ k ≤1.1 / h ,For example k It can be 0.9 / h , 0.95 / h , 1 / h , 1.05 / h 、1.1 / h etc., preferably 1 / h ,in h is the working height of the laser scanning system 3.

[0034] In some embodiments, the width of the oriented silicon steel strip 1 is l 0.75 m-2.70 m, for example, 0.50 m, 0.80 m, 1.00 m, 1.50 m, 1.80 m, etc.; the working height of the laser scanning system 3 h 0.75 m-2.70 m, for example, 0.75 m, 1.00 m, 1.50 m, 2.00 m, 2.70 m, etc.; the absolute value of the generatrix curvature of the convex roller 2.1 and the concave roller 2.2 k 0.33 m -1 -1.46 m -1 , for example, it can be 0.33 m -1 , 0.45 m -1 , 0.85 m -1 , 1.10 m -1 , 1.33 m -1 、1.46m -1 wait.

[0035] Considering the stability of the conveying mechanism 7 and the longitudinal height fluctuation error caused by the gravity of the oriented silicon steel strip 1, the gap D between the convex roller 2.1 and the concave roller 2.2 satisfies D= d 0+2∆ H 0; among them, d 0 is the thickness of the oriented silicon steel strip 1; ∆ H 0 is the longitudinal height fluctuation error, the value range is (10% -15%) × d 0.

[0036] The laser scanning system 3 is used to laser score the oriented silicon steel strip 1, and is arranged just above the adjacent corrective mechanisms 2. Specifically, a laser scanning system 3 can be arranged between each adjacent corrective mechanism 2, that is, the number of laser scanning systems 3 is n, and the number of corrective mechanisms 2 is n+1, where n is a positive integer, and the two are arranged at equal intervals along the rolling direction. Preferably, n is 2, that is, two laser scanning systems 3 are used to scan and score, and two groups of score lines are formed alternately at equal intervals (such as Figure 4 as shown).

[0037] To adapt to different specifications of oriented silicon steel strips 1, the positions of the correction mechanism 2 and the laser scanning system 3 in the conveying direction (rolling direction) of the oriented silicon steel strip 1 can be adjusted. Specifically, the correction mechanism 2 and the laser scanning system 3 can be installed on the sliding guide rail through a structure such as a bracket.

[0038] Preferably, the device includes a detection mechanism 4, which is arranged between adjacent orthopedic mechanisms 2 and is used to detect the curvature of the oriented silicon steel strip 1 between adjacent orthopedic mechanisms 2. When the curvature does not meet the requirements, the position of the orthopedic mechanism 2 and the laser scanning system 3 are manually adjusted. To facilitate position adjustment, the device includes a control mechanism, which is used to receive signals from the detection mechanism 4 and control the position adjustment of the orthopedic mechanism 2 and the laser scanning system 3 and the gap adjustment between the convex roller 2.1 and the concave roller 2.2 in the orthopedic mechanism 2. Specifically, the detection mechanism 4 can use a laser tracker, and the control mechanism can use a computer or PLC.

[0039] Since the distance between the conveying mechanisms 7 is relatively far, the addition of the corrective mechanism 2 will cause lateral deformation of the steel strip, and the device of the present invention is also provided with a tension compensation auxiliary mechanism 5, which is used to compensate for the tension during the conveying process of the oriented silicon steel strip 1. Specifically, the tension compensation auxiliary mechanism 5 can be a tension roller, which is provided between the conveying mechanism 7 and the corrective mechanism 2.

[0040] Based on the above device, the present invention also provides a method for improving the consistency of the scoring quality of oriented silicon steel to ensure that the energy density of the laser irradiated to each point on the surface of the steel strip is consistent during scoring to form a uniform scoring line. The method includes the following steps: During the conveying process of the oriented silicon steel strip 1, the correction mechanism 2 is used to correct the oriented silicon steel strip 1, so that the oriented silicon steel strip 1 is conveyed between the correction mechanisms 2 with the corrected curvature; When the oriented silicon steel strip 1 is conveyed with the corrected curvature, the oriented silicon steel strip 1 is laser scored by the laser scanning system 3 in a rotating mirror scanning mode.

[0041] Preferably, the curvature of the oriented silicon steel strip 1 between adjacent corrective mechanisms 2 is detected, and the position of the corrective mechanism 2 and the laser scanning system 3 in the conveying direction of the oriented silicon steel strip 1 and the gap between the convex roller 2.1 and the concave roller 2.2 in the corrective mechanism 2 are adjusted according to the detection results.

[0042] Take three groups of orthopedic institutions 2 as an example. Figure 2 As shown, the oriented silicon steel strip 1 enters the laser scoring chamber 6 at a certain linear speed (such as 100m / min) through the conveying mechanism 7 on the left, and then a certain tension compensation is applied through the tension auxiliary device 5, and the strip width direction is corrected from a horizontal state to an arc surface through three sets of correction mechanisms 2 composed of convex rollers 2.1 and concave rollers 2.2 in sequence. The detection mechanism 4 feeds back the geometric shape of the strip in real time and determines whether it meets the curvature requirements of the strip. The strip passes through the gap between the rollers and maintains a specific curvature (such as Figure 5 As shown in Figure 2, this deformation is still in the elastic stage and has no negative impact on the notching process.

[0043] According to the requirements of notch spacing and notch line energy density, set the laser power, mirror angular velocity and running speed of the oriented silicon steel strip 1. When notching, the oriented silicon steel strip 1 passes through the notch area directly below the laser scanning system 3, and two laser scanning systems 3 complete the scanning notch in the plate width direction, forming two groups of notch lines alternately formed at equal intervals, and the interval size is set by the scanning mirror offset. After notching, the oriented silicon steel strip 1 leaves the third group of orthopedic mechanisms 2, loses the constraints of the orthopedic mechanisms, and is restored to a flat state through the tension auxiliary device 5, and then passes through the right conveying mechanism 7 to complete the laser notching.

[0044] The present invention is further described below in conjunction with specific embodiments and drawings so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0045] In the following embodiments and comparative examples, the width of the oriented silicon steel strip 1 is l The working height of the laser scanning system 3 is 1200mm h The comparative example adopts the conventional scoring method (scoring during the conveying process); the embodiment adopts the device and method of the present invention for scoring, in which the laser scanning system 3 is two, the orthopedic mechanism 2 is three groups, and the curvature of the orthopedic roller is k 0.56m -1 .

[0046] In Examples 1-3 and Comparative Examples 1-3, 0.23 mm thick oriented silicon steel strips with different initial iron losses were selected. The laser scoring process was performed using the method of the present invention (Example 1-3, the gap D between the convex roller 2.1 and the concave roller 2.2 was 0.28 mm) and the conventional method (Comparative Examples 1-3) according to different initial iron loss levels. The magnetic properties of the steel strip materials were tested and compared under the test conditions of 1.7 T / 50 Hz. The results are shown in Table 1. The sampling method of the test area is as follows: Figure 6 The same sampling positions of Example 1 and Comparative Example 1 were selected to observe the magnetic domain morphology, and the results are shown as follows: Figure 7 and Figure 8 shown.

[0047] Table 1

[0048] In Example 4-6 and Comparative Example 4-6, 0.20 mm thick oriented silicon steel strips with different initial iron loss levels were selected, and laser scoring was performed using the method of the present invention (Example 4-6, the gap D between the convex roller and the concave roller was 0.24 mm) and the conventional method (Comparative Example 4-6) according to different initial iron loss levels. Under the test conditions of 1.7 T / 50 Hz, the magnetic properties of the steel strip materials were tested and compared. The results are shown in Table 2. The sampling method of the test area is as follows: Figure 6 shown.

[0049] Table 2

[0050] As can be seen from Tables 1 and 2, Comparative Examples 1-6 use a conventional scoring method, and the volatility of the iron loss data in each area on each scoring track is relatively large, showing that the iron loss at the edge of the plate width is higher than that in the middle area. This is mainly due to the larger incident angle of the laser beam when scanning the edge of the plate width. Under the same laser power, the scanning speed is faster, the spot area is larger, the laser energy density at this position is lower than that in the middle, and the degree of magnetic domain refinement is insufficient. Comparing Examples 1-6 with Comparative Examples 1-6, under the same specifications and original iron loss range, the volatility of the iron loss values ​​in each test area in the width direction of the steel strip is significantly reduced. At the same time, Figure 7 and Figure 8 The magnetic domain morphology of the steel strip notches shows that, compared with conventional notches, the magnetic domain refinement effect at the edge of the steel strip is more obvious using the notching method of the present invention.

[0051] In summary, based on the method of the present invention, the energy density difference caused by the change of the spot size and scanning speed in the width direction of the steel strip when the oriented silicon steel rotating mirror laser high-speed scanning is used for scoring is effectively overcome, so that the oriented silicon steel can obtain a uniform scoring morphology in the width direction and reduce the iron loss effect, thereby improving the product quality consistency of the oriented silicon steel laser scoring as a whole. In addition, by adding a steel strip correction control auxiliary device, there is no need to design and modify the optical path system, optical components and program algorithms of the laser equipment body, which ensures practicality while greatly saving costs.

[0052] Obviously, the above embodiments are only examples for clear explanation and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from this are still within the protection scope of the invention.

Claims

1. A device for improving the consistency of notch quality of oriented silicon steel, characterized in that: include, A conveying mechanism (7) for conveying the oriented silicon steel strip (1); A correction mechanism (2), at least two groups, is arranged between the conveying mechanism (7); the correction mechanism (2) comprises a convex roller (2.1) and a concave roller (2.2) that cooperate with each other, the convex roller (2.1) and the concave roller (2.2) are rotating body structures, and a gap is left between the convex roller (2.1) and the concave roller (2.2) for the oriented silicon steel strip (1) to pass through; The laser scanning system (3) is arranged directly above the adjacent orthopedic mechanisms (2) and is used to perform laser scoring on the oriented silicon steel strip (1).

2. The device for improving the consistency of notch quality of oriented silicon steel according to claim 1, characterized in that: The positions of the correction mechanism (2) and the laser scanning system (3) in the conveying direction of the oriented silicon steel strip (1) are adjustable.

3. The device for improving the consistency of notch quality of oriented silicon steel according to claim 2, characterized in that: It also includes a detection mechanism (4) and a control mechanism; The detection mechanism (4) is arranged between adjacent corrective mechanisms (2) and is used to detect the curvature of the oriented silicon steel strip (1) between the adjacent corrective mechanisms (2) and transmit a signal to the control mechanism; The control mechanism is used to receive signals from the detection mechanism (4), and to control the position adjustment of the orthopedic mechanism (2) and the laser scanning system (3), as well as the gap adjustment between the convex roller (2.1) and the concave roller (2.2) in the orthopedic mechanism (2).

4. The device for improving the consistency of notch quality of oriented silicon steel according to claim 1, characterized in that: It also comprises a tension force compensation auxiliary mechanism (5), which is arranged between the conveying mechanism (7) and the correction mechanism (2) and is used to compensate for the tension force of the oriented silicon steel strip (1) during the conveying process.

5. The device for improving the consistency of notch quality of oriented silicon steel according to claim 1, characterized in that: The generatrix length of the convex roller (2.1) and the concave roller (2.2) l 'satisfy l '> l ,in l is the width of the oriented silicon steel strip (1); The absolute value of the generatrix curvature of the convex roller (2.1) and the concave roller (2.2) k Satisfy 0.9 / h ≤ k ≤1.1 / h ,in h is the working height of the laser scanning system (3).

6. The device for improving the consistency of notch quality of oriented silicon steel according to claim 5, characterized in that: The width of the oriented silicon steel strip (1) l 0.50 m-1.80 m; the working height of the laser scanning system (3) h 0.75 m-2.70 m; the absolute value of the generatrix curvature of the convex roller (2.1) and the concave roller (2.2) k 0.33 m -1 -1.46 m -1 .

7. The device for improving the consistency of notch quality of oriented silicon steel according to claim 1, characterized in that: In the correction mechanism (2), the gap between the convex roller (2.1) and the concave roller (2.2) D = d 0+2∆ H 0; in, d 0 is the thickness of the oriented silicon steel strip (1); ∆ H 0 is the longitudinal height fluctuation error, the value range is (10%-15%)× d 0.

8. The device for improving the consistency of notch quality of oriented silicon steel according to claim 1, characterized in that: The laser scanning system (3) consists of two groups.

9. A method for improving the consistency of notch quality of oriented silicon steel, characterized in that: The device according to any one of claims 1 to 8 comprises the following steps: During the conveying process of the oriented silicon steel strip (1), a correction mechanism (2) is used to correct the strip, so that the oriented silicon steel strip (1) is conveyed between the correction mechanisms (2) at a corrected curvature; During the process of conveying the oriented silicon steel strip (1) with the corrected curvature, a laser scanning system (3) is used to laser score the oriented silicon steel strip (1) in a rotating mirror scanning mode.

10. The method for improving the consistency of notch quality of oriented silicon steel according to claim 9, characterized in that: The curvature of the oriented silicon steel strip (1) between adjacent corrective mechanisms (2) is detected, and the position of the corrective mechanism (2) and the laser scanning system (3) in the conveying direction of the oriented silicon steel strip (1) and the gap between the convex roller (2.1) and the concave roller (2.2) in the corrective mechanism (2) are adjusted according to the detection result.

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