A method for controlling shear quality of thin-gauge oriented silicon steel

Abstract

The present invention discloses a method for controlling the shearing quality of thin-gauge oriented silicon steel, which comprises step 100: setting a width threshold value Y1 of a white edge zone generated by longitudinal shearing of thin-gauge oriented silicon steel; setting a width threshold value Y2 of a deformation zone generated by longitudinal shearing of thin-gauge oriented silicon steel; in the longitudinal shearing process of thin-gauge oriented silicon steel, adjusting the shearing tool overlap amount L based on the following model formula so that the width of the white edge zone meets the white edge zone width threshold value Y1, and the width of the deformation zone meets the deformation zone width threshold value Y2: Y1=15152×L 2 ‑4200×L+358; Y2=‑280×L 2 +108×L+66; where L is measured in mm, and Y1 and Y2 are measured in μm. The thin-gauge oriented silicon steel shearing quality control method of the present invention can accurately analyze the influence of shearing parameter settings on material properties during longitudinal shearing and slitting, so that transformer or core manufacturers can accurately control longitudinal shearing and slitting quality, improve product performance, achieve lean production, and reduce costs.

Description

Technical Field

[0001] The invention relates to a method for controlling steel quality and a manufacturing method thereof, and in particular to a method for controlling the shear quality of oriented silicon steel. Background Art

[0002] The transformer is an electric energy transmission device manufactured based on the principle of electromagnetic induction, and its application scenarios are quite wide; the iron core, as the core component of the transformer, is known as the "heart of the transformer" and is usually made of oriented silicon steel material.

[0003] With the implementation of the new national energy efficiency standard for transformers GB20052-2020 "Energy Efficiency Limits and Energy Efficiency Grades for Power Transformers", in order to meet the requirements of this standard and improve the cost-effectiveness of transformers, high-grade thin-gauge products need to be applied, especially oriented silicon steel with a thickness of ≤0.20mm will be used in large quantities.

[0004] In the prior art, the main manufacturing processes of transformer cores include longitudinal shearing, transverse shearing, lamination, and assembly of oriented silicon steel coils, among which the shearing quality is the key factor affecting the final performance of the core.

[0005] Therefore, how to organically combine the various parameters designed in the shearing process with the shearing quality, achieve precise control of the shearing quality, and reduce the degradation of thin-gauge materials during the shearing process is the main technical problem for the large-scale application of oriented silicon steel with a thickness of ≤0.20mm.

[0006] At present, some researchers have conducted relevant research on the shearing process of oriented silicon steel. For example, the Chinese patent document with the publication number CN104249187A and the publication date of December 31, 2014, entitled "High Yield Strength Oriented Silicon Steel Shearing Process", discloses a high yield strength oriented silicon steel shearing method, which stabilizes the tension of the sheared strip at the disc shear by controlling the tension of the uncoiler and the coiler, and reduces vibration to achieve the purpose of stable shearing. The tension range of the uncoiler is 15±2N / mm 2 , the coiler tension range is 17±2N / mm 2 A pair of tension-controlling stabilizing rollers are installed before and after the disc shear. The side clearance and overlap of the disc shear are set and incorporated into the control program with a standard setting module to control the edge cutting quality of oriented silicon steel.

[0007] Different from the technical means adopted in the above-mentioned prior art, the present invention hopes to obtain a new method for controlling the shearing quality of thin-gauge oriented silicon steel, so as to analyze the influencing factors of the longitudinal shearing and slitting process of thin-gauge oriented silicon steel, extract and calculate the model formula, and then accurately analyze the degree of influence of each process parameter on the quality and performance of oriented silicon steel, control the quality of the transformer core during shearing, and improve the longitudinal shearing quality of the transformer core of the transformer manufacturer. Summary of the invention

[0008] One of the purposes of the present invention is to provide a method for controlling the shearing quality of thin-gauge oriented silicon steel. By adopting the method for controlling the shearing quality of thin-gauge oriented silicon steel, a model formula affecting the longitudinal shearing quality control and performance of thin-gauge oriented silicon steel can be established during the longitudinal shearing and slitting process, thereby accurately analyzing the shearing quality and performance influence under different shearing processes, improving the longitudinal shearing quality control of the core of the transformer manufacturer, and reducing costs and increasing efficiency for the transformer manufacturer.

[0009] In order to achieve the above object, the present invention provides a method for controlling the shear quality of thin-gauge oriented silicon steel, which comprises step 100:

[0010] Set the width threshold Y1 of the white edge area produced by the longitudinal shearing of thin-gauge oriented silicon steel;

[0011] Set the width threshold Y2 of the deformation zone generated by the longitudinal shearing of thin-gauge oriented silicon steel;

[0012] During the longitudinal shearing process of thin-gauge oriented silicon steel, the shear tool overlap L is adjusted based on the following model formula so that the width of the white edge zone meets the white edge zone width threshold Y1, and the width of the deformation zone meets the deformation zone width threshold Y2:

[0013] Y1=15152×L 2 -4200×L+358;

[0014] Y2=-280×L 2 +108×L+66;

[0015] Among them, the unit parameter of L is mm, and the unit parameters of Y1 and Y2 are μm.

[0016] Different from the prior art, in the present invention, the present invention can analyze the influencing factors of the longitudinal shearing and slitting process of oriented silicon steel according to the production process of the transformer core, extract and calculate the model formula, and then accurately analyze the degree of influence of each process parameter on the quality and performance of oriented silicon steel, so as to control the quality of the transformer core during shearing.

[0017] When analyzing and modeling the factors that affect the shear quality and performance of oriented silicon steel during the longitudinal shearing process, the present invention focuses on analyzing and studying the effects of shear speed, shear tool gap, and shear tool overlap on shear quality and performance. Shear quality can include: burr height, white edge area, and deformation area; performance impact mainly includes: iron loss performance and noise performance.

[0018] In step 100 of the thin-gauge oriented silicon steel shearing quality control method described in the present invention, a width threshold Y1 of the white edge area generated by the thin-gauge oriented silicon steel longitudinal shearing strips is set; and a width threshold Y2 of the deformation area generated by the thin-gauge oriented silicon steel longitudinal shearing strips is set.

[0019] During the longitudinal shearing process of thin-gauge oriented silicon steel, the shear tool overlap L is adjusted based on the following model formula to make the white edge zone width meet the white edge zone width threshold Y1, and the deformation zone width meet the deformation zone width threshold Y2

[0020] Y1=15152×L 2 -4200×L+358;

[0021] Y2=-280×L 2 +108×L+66;

[0022] Among them, the unit parameter of L is mm, and the unit parameters of Y1 and Y2 are μm.

[0023] In the model formula established above, the values ​​of Y1 and Y2 both satisfy the preset range values. The operator can set the white edge area width threshold Y1 and the deformation area width threshold Y2 in advance as needed. For example, the white edge area width threshold Y1 can be preset to be less than 80 μm, and the deformation area width threshold Y2 can be preset to be less than 80 μm. At this time, according to the selected values ​​of Y1 and Y2 within the above-mentioned limited range area, several discrete shear tool overlap L values ​​that simultaneously satisfy the above two model formulas can be obtained.

[0024] It should be noted that the actual width of the white edge and deformation produced during the longitudinal shearing and stripping process of thin-gauge oriented silicon steel can be observed through an optical microscope.

[0025] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method of the present invention, step 100 further includes:

[0026] Set the noise index target value N;

[0027] During the slitting process of thin-gauge oriented silicon steel, the shear tool overlap L is also adjusted based on the following model formula to simultaneously make the noise value meet the noise index target value N;

[0028] N=516×L2 -85×L+56;

[0029] Among them, the unit parameter of N is dB(A).

[0030] In the present invention, noise performance is an important performance parameter of oriented silicon steel, and parameter settings of oriented silicon steel during longitudinal shearing and stripping also have a certain influence on its noise performance.

[0031] Therefore, in step 100 of the thin-gauge oriented silicon steel shearing quality control method of the present invention, a noise index target value N can be further set; in the slitting process of thin-gauge oriented silicon steel, the noise index target value N can be further set based on the model formula: N = 516 × L 2 -85×L+56; adjust the shear tool overlap L so that the noise value meets the noise index target value N at the same time; where the unit parameter of N is dB(A).

[0032] In the present invention, the value range of the noise index target value N is preset by the operator according to the requirements; for example, the noise index target value N≤56dB(A) can be preset.

[0033] That is, according to the model formula of Y1 and Y2, the present invention can obtain several discrete shear tool overlap values ​​L by selecting values ​​of Y1 and Y2 in their respective predefined ranges. On this basis, it can also be further based on the above model formula: N = 516 × L 2 -85×L+56 further screens out all shear tool overlap L values ​​that simultaneously satisfy the above model formulas of Y1, Y2 and N.

[0034] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the white edge zone width threshold Y1 is less than 80 μm, and the deformation zone width threshold Y2 is less than 80 μm.

[0035] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the shearing tool overlap L is selected within the range of 0.1-0.2 mm.

[0036] As described above, in the above technical solution of the present invention, when the white edge area width threshold Y1 is preset to be less than 80 μm, and the deformation area width threshold Y2 is preset to be less than 80 μm, according to the various selected values ​​of Y1 and Y2 in the above-defined range, through the model formula of Y1 and Y2, several discrete shear tool overlap L values ​​can be obtained. On this basis, the shear tool overlap L can be further selected within the range of 0.1-0.2 mm.

[0037] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the thickness of the thin-gauge oriented silicon steel is ≤0.2 mm.

[0038] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method of the present invention, it also includes step 200:

[0039] Set the iron loss target value P;

[0040] During the longitudinal shearing process of thin-gauge oriented silicon steel, the shear tool gap G is also adjusted based on the following model formula to make the iron loss value meet the iron loss target value P:

[0041] P = 0.044ln(G) + 0.85;

[0042] Among them, the unit parameter of P is W / kg, and the unit parameter of G is mm.

[0043] In the present invention, iron loss performance is another important performance parameter of oriented silicon steel. The iron loss degradation of oriented silicon steel after longitudinal shearing and stripping will directly affect the final no-load loss index of transformer core. The value of shearing tool gap G is the most important factor for the degradation of iron loss performance, the shearing speed V has no significant effect on the iron loss performance, and the shearing tool overlap L has no significant effect on the degradation of iron loss performance.

[0044] Therefore, in the above technical scheme of the present invention, in step 200 of the thin-gauge oriented silicon steel shearing quality control method described in the present invention, an iron loss target value P can be further set; in the longitudinal shearing process of thin-gauge oriented silicon steel, the shearing tool gap G can be adjusted based on the model formula: P=0.044ln(G)+0.85 so that the iron loss value meets the iron loss target value P; wherein the unit parameter of P is W / kg, and the unit parameter of G is mm.

[0045] In the present invention, the value range of the iron loss target value P can also be pre-set by the operator according to specific needs; for example: the noise iron loss target value P can be pre-set to be less than 0.7W / kg. At this time, according to the various selected values ​​of the noise iron loss target value P within the above-mentioned limited range, the model formula of P can be used to obtain several discrete values ​​of the shear tool gap G.

[0046] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the shearing tool gap G is selected within the range of 0.005-0.03 mm.

[0047] That is to say, in order to further select the value of the shearing tool gap G, among the obtained values ​​of several discrete shearing tool gaps G, a value that satisfies the shearing tool gap G within the range of 0.005-0.03 mm is further selected.

[0048] Therefore, in the present invention, based on obtaining a plurality of discrete shearing tool gap G values, the shearing tool gap G can be effectively adjusted to meet the noise iron loss target value P<0.7W / kg.

[0049] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the iron loss target value P is less than 0.7 W / kg.

[0050] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method of the present invention, it also includes step 300:

[0051] Set the height threshold B of the burrs generated by the slitting of thin-gauge oriented silicon steel;

[0052] During the slitting process of thin-gauge oriented silicon steel, when the shear tool overlap L and the shear tool gap G have been determined, the shear speed V is adjusted based on the following model formula so that the burr height value meets the height threshold B:

[0053] B=0.21×V+1465×G-20.28×L+78256×G 2 -13.38×V×G+1.43×V×L-9876×G×L-22.2;

[0054] Wherein, L and G represent the parameters determined in step 100 and step 200, the unit parameter of V is m / min, and the unit parameter of B is μm.

[0055] In the present invention, during the longitudinal shearing process of thin-gauge oriented silicon steel, different burr sizes, that is, different burr heights, will be generated due to different settings of the shearing speed V, the shearing tool gap G and the shearing tool overlap L, which directly affects the shearing quality and the performance of the oriented silicon steel.

[0056] Therefore, in the above technical solution of the present invention, in step 300 of the thin-gauge oriented silicon steel shearing quality control method of the present invention, a height threshold B of burrs generated by longitudinally shearing thin-gauge oriented silicon steel strips may be further set.

[0057] In the process of longitudinal shearing of thin-gauge oriented silicon steel, when the shear tool overlap L and shear tool gap G have been determined, it can be further based on the model formula: B = 0.21 × V + 1465 × G - 20.28 × L + 78256 × G 2-13.38×V×G+1.43×V×L-9876×G×L-22.2, adjust the shear speed V so that the burr height value meets the height threshold B; wherein L and G represent the parameters determined in steps 100 and 200, the unit parameter of V is m / min, and the unit parameter of B is μm.

[0058] In the present invention, the value range of the burr height threshold B can also be pre-set by the operator according to specific needs; for example, the burr height threshold B can be pre-set to be less than 15 μm. At this time, according to the various selected values ​​of the height threshold B within this range, based on the above-mentioned model formula of B, several discrete shear velocity V values ​​can be obtained.

[0059] Therefore, in the present invention, based on obtaining a plurality of discrete shear velocity V values, the shear velocity V can be effectively adjusted to ensure that the burr height threshold B is less than 15 μm.

[0060] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the burr height threshold B is less than 15 μm.

[0061] Furthermore, in the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the shearing speed is selected within the range of 80-120 m / min.

[0062] That is to say, in order to further select the value of the shear velocity V, among the values ​​of several discrete shear velocity V satisfying the above model formula, the value satisfying the shear velocity V of 80-120 m / min is further selected.

[0063] Compared with the prior art, the thin-gauge oriented silicon steel shearing quality control method of the present invention has the following advantages and beneficial effects:

[0064] Different from the prior art, in the present invention, according to the production process of the transformer core, the influencing factors of the longitudinal shearing and slitting process of the oriented silicon steel are analyzed, and the model formula is extracted and calculated, and then the degree of influence of each process parameter on the quality and performance of the oriented silicon steel is accurately analyzed, so as to control the quality of the transformer core during shearing.

[0065] By adopting the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the influence of parameter settings on the width of the white edge area, the width of the deformation area, as well as the iron loss, noise and burr height of the material during the longitudinal shearing and slitting process can be accurately analyzed, which can improve the longitudinal shearing quality of the transformer core, improve product performance, reduce costs, and achieve lean production.

[0066] The present invention starts with the longitudinal shearing and slitting process of oriented silicon steel. By analyzing the model of the influence of parameter setting in the longitudinal shearing and slitting process on the shearing quality and material properties, it can help core manufacturers or transformer manufacturers to improve the quality of oriented silicon steel after longitudinal shearing and slitting, reduce the shear degradation of oriented silicon steel materials, and realize lean control of the longitudinal shearing and slitting process. It can reduce costs and increase efficiency for enterprises. It has excellent practicality and popularization, and also has very good promotion prospects. DETAILED DESCRIPTION

[0067] The thin-gauge oriented silicon steel shearing quality control method of the present invention will be further explained and illustrated below in conjunction with specific embodiments. However, such explanation and illustration do not constitute an improper limitation to the technical solution of the present invention.

[0068] In order to further illustrate the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the present invention adopts specific embodiments 1-6 for further explanation.

[0069] Examples 1-6

[0070] In Examples 1-3, B18R065 thin-gauge oriented silicon steel with a thickness of 0.18 mm is used; in Examples 4-6, B20R065 thin-gauge oriented silicon steel with a thickness of 0.20 mm is used.

[0071] In each embodiment, the parameters of the thin-gauge oriented silicon steel in the longitudinal shearing process of embodiments 1-6 can be set based on the following steps:

[0072] Step 100: setting a width threshold value Y1 of the white edge area generated by the longitudinal shearing of thin-gauge oriented silicon steel strips; setting a width threshold value Y2 of the deformation area generated by the longitudinal shearing of thin-gauge oriented silicon steel strips; setting a noise index target value N;

[0073] During the slitting process of thin-gauge oriented silicon steel, the shear tool overlap L is adjusted based on the following model formula to make the white edge area width meet the white edge area width threshold Y1, and the deformation area width meet the deformation area width threshold Y2, and the noise value meet the noise index target value N:

[0074] Y1=15152×L 2 -4200×L+358;

[0075] Y2=-280×L 2 +108×L+66;

[0076] N=516×L 2 -85×L+56;

[0077] Among them, the unit parameter of L is mm, the unit parameters of Y1 and Y2 are μm, and the unit parameter of N is dB(A).

[0078] Step 200: setting the iron loss target value P; during the slitting process of thin-gauge oriented silicon steel, the shearing tool gap G is also adjusted based on the following model formula so that the iron loss value meets the iron loss target value P:

[0079] P=0.044ln(G)+0.85

[0080] Among them, the unit parameter of P is W / kg, and the unit parameter of G is mm.

[0081] Step 300: setting a height threshold B of burrs generated by longitudinal shearing of thin-gauge oriented silicon steel; in the longitudinal shearing process of thin-gauge oriented silicon steel, when the shearing tool overlap L and the shearing tool gap G have been determined, adjusting the shearing speed V based on the following model formula so that the burr height value meets the height threshold B:

[0082] B=0.21×V+1465×G-20.28×L+78256×G 2 -13.38×V×G+1.43×V×L-9876×G×L-22.2;

[0083] Wherein, L and G represent the parameters determined in step 100 and step 200, the unit parameter of V is m / min, and the unit parameter of B is μm.

[0084] Thus, the shearing parameters of the thin-gauge oriented silicon steel in Examples 1-6 during the longitudinal shearing process were obtained, which are listed in the following Table 1.

[0085] Table 1.

[0086]

[0087] Accordingly, based on the data of the shearing speed V, shearing tool gap G and shearing tool overlap L set in Examples 1-6 of the present invention shown in the above Table 1, according to the many model formulas in steps 100-300 of the thin-gauge oriented silicon steel shearing quality control method described in the present invention, the burr height, white edge zone width, deformation zone width, iron loss value and noise value corresponding to each embodiment can be predicted, and the relevant data are listed in the following Table 2.

[0088] Similarly, in Examples 1-6 described in the present invention, the oriented silicon steel of each example that has completed the longitudinal shearing process can also be analyzed and tested to obtain the burr height, white edge zone width, deformation zone width, iron loss value and noise value corresponding to each example measured, and the relevant data are listed in the following Table 2.

[0089] Table 2 lists the predicted data and measured data on burr height, white edge width, deformation zone width, iron loss value and noise value of the thin-gauge oriented silicon steel of Examples 1-6 after longitudinal shearing.

[0090] Table 2.

[0091]

[0092]

[0093] In combination with the above Table 2, it can be seen that the parameters of the thin-gauge oriented silicon steel in Examples 1-6 during the longitudinal shearing process are used, and the model formulas in steps 100-300 of the thin-gauge oriented silicon steel shearing quality control method described in the present invention are used to calculate the predicted data on burr height, white edge zone width, deformation zone width, iron loss value and noise value, which are very close to the actual measured data obtained by actually measuring the thin-gauge oriented silicon steel in Examples 1-6 after longitudinal shearing.

[0094] It can be seen from the above-mentioned embodiments 1-6 that the thin-gauge oriented silicon steel shearing quality control method described in the present invention can accurately analyze the parameters that affect the quality and performance of the oriented silicon steel during the longitudinal shearing and striping process of the thin-gauge oriented silicon steel, and accurately analyze the influence of the shearing parameter setting on the material properties during the longitudinal shearing and striping process through the established model formula, so that the transformer or core manufacturer can accurately control the longitudinal shearing and striping quality, improve product performance, lean production, and reduce costs. It can be seen that through the control method described in the present invention, the operator can optimize the shearing quality by accurately adjusting the parameters of the thin-gauge oriented silicon steel in the longitudinal shearing and striping process.

[0095] It should be noted that the combination of the various technical features in this case is not limited to the combination described in the claims of this case or the combination described in the specific embodiments. All technical features recorded in this case can be freely combined or combined in any way unless there is a contradiction between them.

[0096] It should also be noted that the above-listed embodiments are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and similar changes or modifications made therewith can be directly derived or easily associated with the contents disclosed by those skilled in the art from the present invention, and all should belong to the protection scope of the present invention.

Claims

1. A method for controlling the shear quality of thin-gauge oriented silicon steel, characterized in that: The step 100 comprises: Set the width threshold Y1 of the white edge area produced by the longitudinal shearing of thin-gauge oriented silicon steel; Set the width threshold Y2 of the deformation zone generated by the longitudinal shearing of thin-gauge oriented silicon steel; During the longitudinal shearing process of thin-gauge oriented silicon steel, the shear tool overlap L is adjusted based on the following model formula so that the width of the white edge zone meets the white edge zone width threshold Y1, and the width of the deformation zone meets the deformation zone width threshold Y2: Y1=15152×L 2 -4200×L+358; Y2=-280×L 2 +108×L+66; Among them, the unit parameter of L is mm, and the unit parameters of Y1 and Y2 are μm.

2. The thin-gauge oriented silicon steel shearing quality control method according to claim 1, characterized in that: The step 100 further includes: Set the noise index target value N; During the slitting process of thin-gauge oriented silicon steel, the shear tool overlap L is also adjusted based on the following model formula to simultaneously make the noise value meet the noise index target value N: N=516×L 2 -85×L+56; Among them, the unit parameter of N is dB(A).

3. The thin-gauge oriented silicon steel shearing quality control method according to claim 1, characterized in that: The white edge area width threshold Y1 is less than 80 μm, and the deformation area width threshold Y2 is less than 80 μm.

4. The thin gauge oriented silicon steel shearing quality control method according to claim 3, characterized in that: The shear tool overlap L is selected within the range of 0.1-0.2mm.

5. The thin gauge oriented silicon steel shearing quality control method according to claim 2, characterized in that: The target value of noise index is N≤56dB(A).

6. The thin-gauge oriented silicon steel shearing quality control method according to claim 1, characterized in that: The thickness of thin-gauge oriented silicon steel is ≤0.2mm.

7. The method for controlling the shear quality of thin-gauge oriented silicon steel according to any one of claims 1 to 6, characterized in that: The step 200 is also included: Set the iron loss target value P; During the longitudinal shearing process of thin-gauge oriented silicon steel, the shear tool gap G is also adjusted based on the following model formula to make the iron loss value meet the iron loss target value P: P = 0.044ln(G) + 0.85; Among them, the unit parameter of P is W / kg, and the unit parameter of G is mm.

8. The method for controlling the shearing quality of thin-gauge oriented silicon steel according to claim 7, characterized in that: The iron loss target value P is less than 0.7W / kg.

9. The thin gauge oriented silicon steel shearing quality control method according to claim 8, characterized in that: The shear tool gap G is selected within the range of 0.005-0.03mm.

10. The thin-gauge oriented silicon steel shearing quality control method according to claim 7, characterized in that: The step 300 is also included: Set the height threshold B of the burrs generated by the slitting of thin-gauge oriented silicon steel; During the slitting process of thin-gauge oriented silicon steel, when the shear tool overlap L and the shear tool gap G have been determined, the shear speed V is adjusted based on the following model formula so that the burr height value meets the height threshold B: B=0.21×V+1465×G-20.28×L+78256×G 2 -13.38×V×G+1.43×V×L-9876×G×L-22.2; Wherein, L and G represent the parameters determined in step 100 and step 200, the unit parameter of V is m / min, and the unit parameter of B is μm.

11. The method for controlling the shearing quality of thin-gauge oriented silicon steel according to claim 10, characterized in that: The height threshold of the burr is B<15μm.

12. The method for controlling the shearing quality of thin-gauge oriented silicon steel according to claim 11, characterized in that: The shearing speed is selected within the range of 80-120 m / min.

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