An apparatus and method for improving the quality consistency of orientation silicon steel scoring

Abstract

The present application belongs to the technical field of laser marking of oriented silicon steel, and particularly relates to a device and method for improving the consistency of the quality of laser marking of oriented silicon steel. The device comprises a conveying mechanism, a straightening mechanism and a laser scanning system. The straightening mechanism is at least two groups and is arranged between the conveying mechanism. The straightening mechanism comprises a male roller and a female roller which cooperate with each other. The male roller and the female roller are of a rotary body structure, and a gap is left between the male roller and the female roller for the passing of the oriented silicon steel strip. The present application straightens the steel strip in the width direction according to a specific curvature through the straightening roller with a special-shaped structure, overcomes the large energy density difference caused by the change of the spot size and the scanning speed of the laser beam in the width direction of the steel strip when the high-speed rotating mirror scans, and makes the oriented silicon steel have uniform marking appearance and low iron loss effect in the width direction, thereby improving the product quality consistency of the laser marking of the oriented silicon steel as a whole.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of laser marking of oriented silicon steel, and particularly relates to a device and method for improving the consistency of the quality of laser marking of oriented silicon steel. BACKGROUND

[0002] The laser marking technology of oriented silicon steel is to form laser scribe lines with a certain interval by using the high energy density of laser beams, perpendicular to the rolling direction (RD) of the silicon steel strip, at a certain laser power and scanning speed, so that the local area of the material surface is subjected to instantaneous thermal stress and plastic deformation, and the residual stress generated in the micro area is relied on to control the magnetic domain morphology, so as to reduce the abnormal eddy current loss of the silicon steel sheet. The application of the technology can further reduce the core loss, and has important significance for realizing the low-carbon and energy-saving development goal of the power industry.

[0003] At present, the industry mainly uses a mechanical scanning mirror to control the laser scanning path. Compared with the galvanometer scanning, the multi-faceted prism has the advantages of large scanning angle, wide scanning path range, high speed stability and the like, which greatly improves the production efficiency of laser marking of oriented silicon steel, and is widely applicable to wide-width oriented silicon steel laser marking. However, when the scanning mirror is used, on the one hand, the scanning speed of each point of the scanning track in the width direction of the steel strip is not the same after the laser beam is reflected by the rotating scanning mirror at a constant speed, especially in the wide-width planar processing at a low working distance, the speed difference between the two ends of the scribe line and the middle part is the most obvious; on the other hand, the spot shape on the surface of the steel strip changes with the change of the angle between the incident laser beam and the plane α Figure 1 Therefore, the energy density at each position on each scribe line is not consistent, and the scribe domain refinement effect is greatly different, which leads to the gradual reduction of the scribe loss reduction effect of the steel strip from the middle to the edge along the width direction, and seriously affects the consistency of the silicon steel scribe quality and the product stability.

[0004] In view of the problem of uneven laser energy during laser marking, the existing patent technology mainly proposes improvement measures from the aspects of the laser beam system and the device. Patent JP2000336430A discloses a magnetic domain control method for oriented electrical steel sheet, which specifically arranges multiple pulsed lasers in the width direction of the sheet, adopts a laser irradiation mode of multi-stage array semiconductor laser and integrated lens, and obtains linear beams arranged at equal intervals in the rolling direction; patent JP2004122218A divides one laser source into multiple irradiation sections by a beam splitter, and then acts on the width direction of the steel sheet. By means of the steel sheet moving speed, the light beam scanning speed, and the laser power proportion increasing and decreasing device, the interval consistency of the scribe line in the rolling direction is controlled, and the effect of providing good magnetic properties is provided.

[0005] ​Patent CN103596720A provides a kind of manufacturing device of oriented silicon steel and its manufacturing method, specifically by being equipped with multiple laser beam irradiation devices in the conveying direction of steel plate, and make the width direction moving mechanism of laser beam irradiation device move in the width direction of steel plate, by adjusting the overlapping width of adjacent laser irradiation line in width direction, magnetic area control is carried out, so as to stabilize iron loss and magnetostriction characteristics.The method needs to further eliminate negative effects by adjusting the size of notch line overlapping area.

[0006] Patent CN116475581A provides a kind of laser notching method of silicon steel partition unequal power, the oriented silicon steel strip is divided into three transverse partitions in transverse direction, each transverse partition is provided with a laser head, and is arranged at the same height, and different power process is used for laser notching in different partitions.In the case of ensuring that the whole oriented silicon steel strip can obtain significant notching loss reduction effect, the damage to the insulating coating can also be avoided or reduced.The grains and texture formed by secondary recrystallization and the coating application process cause the regional distribution characteristics in the transverse direction, resulting in different magnetic properties in different regions.

[0007] The above-mentioned methods can better control the uniformity between rolling direction and notching, wherein the single laser notch is divided into several segments by using array laser, which can eliminate the energy difference of different areas of each notch line, but this method has high requirements for device and optical system integration and stability, and it is difficult to control the overlapping width of adjacent laser irradiation lines in the width direction;The partition unequal power notching method using multiple laser heads improves the difference between the edge and the middle caused by secondary crystallization of steel strip annealing, but cannot fundamentally solve the phenomenon of uneven laser energy density caused by spot scanning speed and spot shape fluctuation. SUMMARY

[0008] The present application aims to solve the above problems and provides a device and method for improving the consistency of oriented silicon steel notch quality, which can fundamentally solve the phenomenon of uneven laser energy density caused by spot scanning speed and spot shape fluctuation, thereby improving the consistency of oriented silicon steel notch quality.

[0009] According to the technical scheme of the present application, the device for improving the consistency of oriented silicon steel notch quality comprises,

[0010] A conveying mechanism for conveying oriented silicon steel strip;

[0011] A straightening mechanism, at least two groups, is arranged between the conveying mechanism; The straightening mechanism comprises a convex roller and a concave roller cooperating with each other, and the convex roller and the concave roller are of a rotary body structure, and a gap is left between the convex roller and the concave roller for the oriented silicon steel strip to pass through;

[0012] A laser scanning system is arranged above the adjacent straightening mechanisms to perform laser marking on the oriented silicon steel strip.

[0013] Further, the positions of the straightening mechanisms and the laser scanning system along the conveying direction of the oriented silicon steel strip can be adjusted.

[0014] Further, the device further comprises a detection mechanism and a control mechanism.

[0015] The detection mechanism is arranged between the adjacent straightening mechanisms to detect the curvature of the oriented silicon steel strip between the adjacent straightening mechanisms and transmit a signal to the control mechanism.

[0016] The control mechanism is configured to receive the signal from the detection mechanism and control the position adjustment of the straightening mechanisms and the laser scanning system and the gap adjustment between the convex roller and the concave roller in the straightening mechanism.

[0017] Further, the device further comprises a tension compensation auxiliary mechanism arranged between the conveying mechanism and the straightening mechanism to compensate the tension of the oriented silicon steel strip during the conveying process.

[0018] Further, the tension compensation auxiliary mechanism is a tension roller.

[0019] Further, the length of the generatrix of the convex roller and the concave roller l satisfies l > l wherein l is the width of the oriented silicon steel strip.

[0020] The absolute value of the curvature of the generatrix of the convex roller and the concave roller k satisfies 0.9 / h ≤ k ≤1.1 / h wherein h is the working height of the laser scanning system, i.e. the vertical distance from the laser scanning system to the oriented silicon steel strip.

[0021] Further, the width of the oriented silicon steel strip l is 0.50 m-1.80 m; the working height of the laser scanning system h is 0.75 m-2.70 m; and the absolute value of the curvature of the generatrix of the convex roller and the concave roller k is 0.33 m -1 -1.46 m -1 .

[0022] Further, the gap D between the convex roller and the concave roller in the straightening mechanism d satisfies 0+2∆ H0;

[0023] wherein, d 0 is the thickness of the oriented silicon steel strip; ∆ H 0 is the longitudinal height fluctuation error, ranging from (10%-15)% of the thickness of the oriented silicon steel strip; d 0.

[0024] Further, the laser scanning system is two groups.

[0025] Another aspect of the present application provides a method for improving the consistency of the notch quality of oriented silicon steel, using the above device, comprising the following steps:

[0026] In the process of conveying the oriented silicon steel strip, the orthopedic mechanism is used for orthopedic, so that the oriented silicon steel strip is conveyed between the orthopedic mechanisms with the curvature after orthopedic;

[0027] In the process of conveying the oriented silicon steel strip with the curvature after orthopedic, the laser scanning system is used to scan the oriented silicon steel strip in the rotating mirror scanning mode.

[0028] Further, the curvature of the oriented silicon steel strip between adjacent orthopedic mechanisms is detected, and the positions of the orthopedic 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 orthopedic mechanism are adjusted according to the detection result.

[0029] The technical scheme of the present application has the following advantages compared with the prior art: without changing the working mode of the laser scanning system, the orthopedic roller with special-shaped structure (including convex roller and concave roller) is used to orthopedic the steel strip in the width direction according to a certain curvature, which overcomes the larger energy density difference caused by the change of spot size and scanning speed in the width direction of the steel strip due to high-speed rotating mirror scanning. Through the implementation of the present application, the oriented silicon steel gets uniform notch magnetic domain morphology and iron loss reduction effect in the width direction, which improves the product quality consistency of the oriented silicon steel laser notch as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a schematic diagram of the beam scanning feature of the existing laser notch technology.

[0031] Figure 2 It is a structural schematic diagram of the device of the present application.

[0032] Figure 3 It is a schematic diagram of the orthopedic mechanism of the present application.

[0033] Figure 4 It is a schematic diagram of the laser notch line based on the orthopedic control of the device of the present application.

[0034] Figure 5 This is a schematic diagram showing the relationship between the arc surface of the grain-oriented silicon steel strip along its width and the position of the laser beam.

[0035] Figure 6 This is a sampling diagram for comparing the loss performance of grain-oriented silicon steel.

[0036] Figure 7 Comparative Example 1: Refined morphology of magnetic domains at sampling points (Figure (a)). Figure 6 Position A3 in the middle, corresponding to Figure (b) Figure 6 (Position A1 in the middle).

[0037] Figure 8 The refined morphology of magnetic domains at the sampling point in Example 1 (corresponding to Figure (a)) Figure 6 Position A3 in the middle, corresponding to Figure (b) Figure 6 (Position A1 in the middle).

[0038] Explanation of reference numerals in the attached drawings: 1-Oriented silicon steel strip, 2-Shaping mechanism, 2.1-Convex roller, 2.2-Concave roller, 3-Laser scanning system, 4-Detection mechanism, 5-Tension compensation auxiliary mechanism, 6-Laser marking chamber, 7-Transfer mechanism. Detailed Implementation

[0039] This invention addresses the problem in existing technologies that fail to fundamentally resolve the issue of uneven laser energy density caused by fluctuations in laser spot scanning speed and shape. It proposes a device and method to improve the consistency of laser marking quality in grain-oriented silicon steel. By correcting the curvature parameters of the grain-oriented silicon steel strip shape, it ensures that marking lines are formed on the silicon steel surface at equal intervals perpendicular to the rolling direction, with consistent laser energy density at each marking line. This method is suitable for grain-oriented silicon steel laser marking systems using high-speed scanning rotating mirrors and effectively improves the consistency and stability of laser marking quality in grain-oriented silicon steel products.

[0040] like Figure 2 As shown, the device for improving the consistency of the marking quality of oriented silicon steel according to the present invention includes: a conveying mechanism 7, a straightening mechanism 2, and a laser scanning system 3.

[0041] The conveying mechanism 7 is used to convey the grain-oriented silicon steel strip 1, and a laser marking chamber 6 is formed between the conveying mechanisms 7. At least two sets of straightening mechanisms 2 are arranged between the conveying mechanisms 7 and located within the laser marking chamber 6, used to straighten the grain-oriented silicon steel strip 1. The straightening 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 have a rotating structure, and a gap is left between the convex roller 2.1 and the concave roller 2.2 for the grain-oriented silicon steel strip 1 to pass through. During laser marking, the grain-oriented silicon steel strip 1 passes horizontally and uniformly through the gap between the convex roller 2.1 and the concave roller 2.2, undergoing elastic deformation and satisfying the curvature in the width direction required by the marking area.

[0042] As shown in Figure 3 Fig. 1, 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 straightening effect, the length of the generatrix of the convex roller 2.1 and the concave roller 2.2 l is greater than the width of the oriented silicon steel strip 1. l The absolute value of the curvature of the generatrix of the convex roller 2.1 and the concave roller 2.2 k satisfies 0.9 / h ≤ k ≤1.1 / h , for example, can be 0.9 / k , 0.95 / h , 1 / h , 1.05 / h , 1.1 / h , etc., and is preferably 1 / h , wherein h is the working height of the laser scanning system 3. h

[0043] In some embodiments, the width of the oriented silicon steel strip 1 l is 0.75 m-2.70 m, for example, can be 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 is 0.75 m-2.70 m, for example, can be 0.75 m, 1.00 m, 1.50 m, 2.00 m, 2.70 m, etc.; the absolute value of the curvature of the generatrix of the convex roller 2.1 and the concave roller 2.2 k is 0.33 m -1 -1.46 m -1 , for example, can be 0.33 m -1 , 0.45 m -1 , 0.85 m -1 , 1.10 m -1 , 1.33 m -1 , 1.46 m -1 , etc.

[0044] Considering the stability of the conveying mechanism 7 and the longitudinal height fluctuation error caused by the self-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; wherein, d 0 is the thickness of the oriented silicon steel strip 1; ∆ H 0 is the longitudinal height fluctuation error, which is in the range of (10%-15%)× d 0. ​

[0045] The laser scanning system 3 is used for laser marking of the oriented silicon steel strip 1 and is arranged directly above the adjacent straightening mechanisms 2. Specifically, one laser scanning system 3 can be arranged between each adjacent straightening mechanism 2, that is, the number of laser scanning systems 3 is n, the number of groups of straightening mechanisms 2 is n+1, 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 for scanning and marking, and two groups of marking lines are alternately formed at equal intervals (as shown in FIG. 2). Figure 4

[0046] In order to adapt to different specifications of the oriented silicon steel strip 1, the positions of the straightening mechanisms 2 and the laser scanning systems 3 in the conveying direction (the rolling direction) of the oriented silicon steel strip 1 can be adjusted. Specifically, the straightening mechanisms 2 and the laser scanning systems 3 can be mounted on sliding rails through supports and the like.

[0047] Preferably, the device comprises a detection mechanism 4 arranged between adjacent straightening mechanisms 2 for detecting the curvature of the oriented silicon steel strip 1 between the adjacent straightening mechanisms 2, and when the curvature does not meet the requirements, manual operation is performed to adjust the positions of the straightening mechanisms 2 and the laser scanning systems 3. In order to facilitate position adjustment, the device comprises a control mechanism for receiving signals from the detection mechanism 4 and controlling the position adjustment of the straightening mechanisms 2 and the laser scanning systems 3 and the gap adjustment between the convex roller 2.1 and the concave roller 2.2 in the straightening mechanism 2. Specifically, the detection mechanism 4 can adopt a laser tracker, and the control mechanism can adopt a computer or a PLC.

[0048] Due to the long distance between the conveying mechanisms 7, the straightening mechanisms 2 increase the transverse deformation of the steel strip, and the device of the present application further comprises a tension force compensation auxiliary mechanism 5 for compensating the tension force of the oriented silicon steel strip 1 during conveying. Specifically, the tension force compensation auxiliary mechanism 5 can adopt a tension roller and is arranged between the conveying mechanism 7 and the straightening mechanism 2.

[0049] Based on the above device, the present application further provides a method for improving the consistency of the oriented silicon steel marking quality to ensure that the energy density of the laser irradiation to each point on the surface of the steel strip is consistent when marking, and uniform marking lines are formed. The method comprises the following steps:

[0050] In the process of conveying the oriented silicon steel strip 1, the straightening mechanism 2 is used for straightening, so that the oriented silicon steel strip 1 is conveyed between the straightening mechanisms 2 with the curvature after straightening;

[0051] In the process of conveying the oriented silicon steel strip 1 with the curvature after straightening, the laser scanning system 3 is used to laser mark the oriented silicon steel strip 1 in a rotating mirror scanning mode.

[0052] ​Preferably, the curvature of the oriented silicon steel strip 1 between adjacent straightening mechanisms 2 is detected, and the positions of the straightening 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 straightening mechanism 2 are adjusted according to the detection results.

[0053] Taking the three sets of orthopedic mechanisms 2 as an example, such as Figure 2 As shown, the grain-oriented silicon steel strip 1 enters the laser marking chamber 6 at a certain linear speed (e.g., 100 m / min) via the left-side conveying mechanism 7. Subsequently, a certain tension compensation is applied by the tensioning auxiliary device 5, and the strip passes sequentially through three sets of straightening mechanisms 2 consisting of convex rollers 2.1 and concave rollers 2.2. The width direction of the steel strip is corrected from a horizontal state to an arc-shaped surface. The detection mechanism 4 provides real-time feedback on the geometric shape of the steel strip and determines whether it meets the curvature requirements. The steel strip maintains a specific curvature (e.g., ...) within the marking area as it passes through the gap between the rollers. Figure 5 As shown in the figure, since this deformation is still in the elastic stage, it has no negative impact on the scoring process.

[0054] Based on the requirements for the scribe spacing and scribe line energy density, the laser power, the rotating mirror angular velocity, and the running speed of the oriented silicon steel strip 1 are set. During scribe, the oriented silicon steel strip 1 passes through the scribe area directly below the laser scanning system 3. The two laser scanning systems 3 complete the scanning and scribe in the width direction, forming two sets of scribe lines that are alternately formed at equal intervals. The interval size is set by the offset of the scanning rotating mirror. After scribe, the oriented silicon steel strip 1 leaves the third set of straightening mechanisms 2, loses the constraint of the straightening mechanism, and is restored to a flat state by the tensioning auxiliary device 5. Then, it passes through the right-side conveying mechanism 7 to complete the laser scribe.

[0055] The present invention will be further described below with reference to specific embodiments and accompanying drawings, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0056] In the following embodiments and comparative examples, the width of the grain-oriented silicon steel strip 1 is... l The working height of laser scanning system 3 is 1200mm. h The diameter is 1800mm. The comparative example uses a conventional scoring method (scoring during transport); the embodiment uses the device and method of this invention for scoring. The device has two laser scanning systems 3 and three sets of straightening mechanisms 2, with the curvature of the straightening rollers... k It is 0.56m -1 .

[0057] In the examples 1-3 and the comparative examples 1-3, the oriented silicon steel strips with a thickness of 0.23 mm and different initial iron losses were selected, the laser marking treatment was performed on the strips by using the method of the present application (the examples 1-3, the gap D between the convex roller 2.1 and the concave roller 2.2 is 0.28 mm) and the conventional method (the comparative examples 1-3) respectively according to different initial iron loss levels, the magnetic property test of the strips was compared under the test condition of 1.7T / 50Hz, the results are shown in Table 1, and the sampling mode of the test area is shown in Figure 6 The same sampling positions of the example 1 and the comparative example 1 were selected for observing the magnetic domain morphology, and the results are shown in Figure 7 and Figure 8

[0058] Table 1

[0059]

[0060] In the examples 4-6 and the comparative examples 4-6, the oriented silicon steel strips with a thickness of 0.20 mm and different initial iron losses were selected, the laser marking treatment was performed on the strips by using the method of the present application (the examples 4-6, the gap D between the convex roller and the concave roller is 0.24 mm) and the conventional method (the comparative examples 4-6) respectively according to different initial iron loss levels, the magnetic property test of the strips was compared under the test condition of 1.7T / 50Hz, the results are shown in Table 2, and the sampling mode of the test area is shown in Figure 6

[0061] Table 2

[0062]

[0063] As shown in Tables 1 and 2, the conventional marking method is used in the comparative examples 1-6, the fluctuation of the iron loss data of each area on each marking track is large, and the iron loss of the edge of the strip is higher than that of the middle area, mainly because the light beam incidence angle is large when the laser scans the edge of the strip, under the same laser power, the scanning speed is faster, the spot area is larger, the laser energy density at this position is lower, and the degree of domain refinement is insufficient. The examples 1-6 are compared with the comparative examples 1-6 respectively, under the same specification and original iron loss range, the fluctuation of the iron loss value of each test area in the width direction of the strip is significantly reduced. At the same time, Figure 7 and Figure 8 The strip marking domain morphology of the examples 1-6 and the comparative examples 1-6 shows that, compared with the conventional marking, the domain refinement effect of the edge of the strip is more obvious by using the marking method of the present application.

[0064] ​​In summary, based on the method of the present application, the energy density difference caused by the change of the spot size in the width direction of the steel strip and the scanning speed when the oriented silicon steel is scanned by the mirror type laser high speed scanning is effectively overcome, and then the oriented silicon steel is uniformly indented in the width direction and the iron loss is reduced, thereby improving the product quality consistency of the oriented silicon steel laser indentation as a whole. In addition, by adding the steel strip straightening control auxiliary device, the optical system, optical components and program algorithm of the laser equipment body do not need to be designed and changed, which ensures the practicability while greatly saving the cost.

[0065] Obviously, the above embodiments are only examples for clearly illustrating, not limiting the embodiments. For those skilled in the art, other different forms of changes or variations can be made on the basis of the above description. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An apparatus for improving the consistency of groove quality in grain-oriented silicon steel, characterized in that, include, Conveying mechanism (7) for conveying oriented silicon steel strip (1); The straightening mechanism (2), at least two sets, is arranged between the conveying mechanism (7); the straightening 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 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; A laser scanning system (3) is positioned directly above the adjacent orthopedic mechanism (2) for laser marking of the oriented silicon steel strip (1); It also includes a detection mechanism (4) and a control mechanism. The detection mechanism (4) is disposed between adjacent orthopedic mechanisms (2) and is used to detect the curvature of the oriented silicon steel strip (1) between adjacent orthopedic mechanisms (2) and transmit the signal to the control mechanism. The control mechanism is used to receive the signal from the detection mechanism (4) and control the position adjustment of the orthopedic mechanism (2) and the laser scanning system (3) in the conveying direction of the oriented silicon steel strip (1) and the gap adjustment between the convex roller (2.1) and the concave roller (2.2) in the orthopedic mechanism (2). The absolute value of the generatrix curvature of the convex roller (2.1) and the concave roller (2.2) k Satisfying 0.9 / h ≤ k ≤1.1 / h ,in h The working height of the laser scanning system (3) is given.

2. The apparatus for improving the consistency of groove quality in grain-oriented silicon steel as described in claim 1, characterized in that, It also includes a tension compensation auxiliary mechanism (5), which is located between the conveying mechanism (7) and the straightening mechanism (2) to compensate for the tension during the conveying process of the oriented silicon steel strip (1).

3. The apparatus for improving the consistency of groove quality in grain-oriented silicon steel as described in claim 1, characterized in that, The generatrix lengths of the convex roller (2.1) and the concave roller (2.2) l 'satisfy l > l ,in l The width of the oriented silicon steel strip (1) is given.

4. The apparatus for improving the consistency of groove quality in grain-oriented silicon steel as described in claim 1, characterized in that, The width of the oriented silicon steel strip (1) l The working height of the laser scanning system (3) is 0.50 m to 1.80 m. h The absolute values ​​of the generatrix curvature of the convex roller (2.1) and concave roller (2.2) are 0.75 m to 2.70 m. k It is 0.33 m -1 -1.46 m -1 .

5. The apparatus for improving the consistency of groove quality in grain-oriented silicon steel as described in claim 1, characterized in that, In the orthopedic 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 represents the thickness of the oriented silicon steel strip (1); ∆ H 0 represents the longitudinal height fluctuation error, with a value range of (10%-15%) × d 0.

6. The apparatus for improving the consistency of groove quality in grain-oriented silicon steel as described in claim 1, characterized in that, The laser scanning system (3) consists of two sets.

7. A method for improving the consistency of groove quality in grain-oriented silicon steel, characterized in that, The apparatus according to any one of claims 1-6 comprises the following steps: During the conveying process of the oriented silicon steel strip (1), a straightening mechanism (2) is used to straighten it so that the oriented silicon steel strip (1) is conveyed between the straightening mechanisms (2) with the straightened curvature. During the process of conveying the oriented silicon steel strip (1) with the corrected curvature, the oriented silicon steel strip (1) is laser-marked by a laser scanning system (3) in a rotating mirror scanning mode.

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