Method for improving warping of oriented silicon steel finished product

Abstract

The invention discloses a method for improving warping of an oriented silicon steel finished product. The method comprises the following steps: adjusting the specific gravity of oriented silicon steel insulating coating liquid to be 1.10-1.30 g / cm < 3 > before stretching of a flattening stretching unit; the groove depth of the upper coating roller coated with the oriented silicon steel insulating coating liquid is adjusted to be 0.06 mm-0. 20 mm, and the groove depth of the lower coating roller coated with the oriented silicon steel insulating coating liquid is adjusted to be 0.06 mm-0. 20 mm; the pressure of the upper coating roller and the lower coating roller is controlled to be 8-15 KN when the oriented silicon steel insulating coating liquid is smeared, and the oriented silicon steel insulating coating liquid is smeared on the upper surface and the lower surface of the oriented silicon steel; the temperature of an outlet plate of the drying furnace is controlled to be 500-800 DEG C; and the cured oriented silicon steel with the oriented silicon steel insulating coating liquid is fed into a flattening stretching furnace to be stretched, and the tension in the flattening stretching furnace is controlled to be 8-12 MPa. According to the method, the thickness difference of coatings on the upper surface and the lower surface is reduced, the residual curvature is remarkably reduced and kept stable by adjusting the specific gravity of oriented silicon steel insulating coating liquid, the groove profile and the pressure of an upper coating roller and a lower coating roller, the tension in a furnace and other processes, the proportion of the residual curvature smaller than or equal to 10 mm of a finished product is increased to 98% or above from 45%, and warping of the finished product is obviously improved.

Description

Technical Field

[0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for improving the warping of oriented silicon steel products. Background Art

[0002] Grain-oriented silicon steel is primarily used in transformers, mutual inductors, and large motors. It is a key functional material in the manufacture of transformer cores and is known as the "crown jewel of steel." Its notable characteristics include a long manufacturing process, a narrow process window, and strict process control.

[0003] As a binary alloy with a Si content of 3.0-3.5%, the current production process of oriented silicon steel not only requires strict control of the content of beneficial elements such as Mn, Al, N, and S, but also requires a series of complex process flows such as hot rolling, normalizing, cold rolling, decarburization annealing, high-temperature annealing, and flattening to finally obtain the finished steel coil.

[0004] After high-temperature annealing, oriented silicon steel has undergone severe deformation. The plate shape can be significantly improved after hot flattening and stretching, but sometimes the residual curvature of the finished product is too large, which eventually leads to a "bend" to one side when the iron core is stacked, seriously affecting the use of transformer users. Summary of the Invention

[0005] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a method for improving the warpage of oriented silicon steel products.

[0006] The method for improving the warpage of a finished product of an oriented silicon steel according to the present invention comprises:

[0007] Before stretching in the flattening stretching unit, adjust the specific gravity of the oriented silicon steel insulation coating liquid to 1.10g / cm3~1.30g / cm3;

[0008] Adjust the groove depth of the upper coating roller for applying the oriented silicon steel insulating coating liquid to 0.06mm~0.20mm, and adjust the groove depth of the lower coating roller for applying the oriented silicon steel insulating coating liquid to 0.06mm~0.20mm;

[0009] Control the pressure of the upper coating roller and the lower coating roller to 8KN to 15KN when applying the oriented silicon steel insulation coating liquid, and apply the oriented silicon steel insulation coating liquid to the upper and lower surfaces of the oriented silicon steel;

[0010] The oriented silicon steel insulation coating liquid is solidified in a drying furnace, and the plate temperature at the drying furnace outlet is controlled at 500℃~800℃;

[0011] The solidified oriented silicon steel with oriented silicon steel insulation coating is sent into a flat stretching furnace for stretching, and the tension in the flat stretching furnace is controlled at 8MPa to 12MPa.

[0012] Preferably, in the above method for improving the warpage of the finished product of oriented silicon steel, the specific gravity of the oriented silicon steel insulating coating liquid is adjusted to 1.15 g / cm3 to 1.25 g / cm3.

[0013] Preferably, in the above method for improving the warpage of oriented silicon steel products, the groove depth of the upper coating roller is adjusted to 0.10 mm to 0.16 mm, and the groove depth of the lower coating roller is adjusted to 0.12 mm to 0.18 mm.

[0014] Preferably, in the above method for improving the warpage of the finished product of grain-oriented silicon steel, the pressure of the upper coating roller and the lower coating roller when applying the grain-oriented silicon steel insulating coating liquid is controlled to be 10KN to 13KN.

[0015] Preferably, in the above method for improving the warpage of finished oriented silicon steel products, the plate temperature at the drying furnace outlet is controlled at 600°C to 700°C.

[0016] Preferably, in the above method for improving the warpage of oriented silicon steel products, the tension in the flattening and stretching furnace is controlled at 9 MPa to 11 MPa.

[0017] The method for improving the warpage of oriented silicon steel products of the present invention has the following advantages and beneficial effects:

[0018] The present invention reduces the difference in coating thickness between the upper and lower surfaces by adjusting the specific gravity of the oriented silicon steel insulating coating liquid, the groove shape and pressure of the upper and lower coating rollers, coating curing, and tension in the furnace, thereby significantly reducing the residual curvature and maintaining stability. The proportion of residual curvature of the finished product ≤10 mm is increased from 45% to more than 98%, and the warping of the finished product is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only used to further understand the embodiments of the present invention and constitute part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0020] Figure 1 The surface morphology of the oriented silicon steel coating produced in Example 4 of the present invention;

[0021] Figure 2 The surface morphology of the oriented silicon steel coating produced in comparative example 1 of the prior art. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] To address the issue of bent cores in oriented silicon steel, this invention adjusts the specific gravity of the insulating coating solution, the groove profile and pressure of the upper and lower coating rollers, coating curing, and furnace tension. The invention clarifies the relationship between the stress coating in the flattening and stretching unit, the residual curvature of the finished product, and the "bend" in the core stack. By adjusting parameters such as the coating's physical properties and the coating machine's application, the invention significantly reduces and stabilizes the residual curvature, thereby improving the warpage of the finished product.

[0024] The method for improving the warpage of a finished product of an oriented silicon steel according to the present invention comprises:

[0025] Before stretching in the flattening stretching unit, adjust the specific gravity of the oriented silicon steel insulation coating liquid to 1.10g / cm3~1.30g / cm3;

[0026] Adjust the groove depth of the upper coating roller for applying the oriented silicon steel insulating coating liquid to 0.06mm~0.20mm, and adjust the groove depth of the lower coating roller for applying the oriented silicon steel insulating coating liquid to 0.06mm~0.20mm;

[0027] Control the pressure of the upper coating roller and the lower coating roller to 8KN to 15KN when applying the oriented silicon steel insulation coating liquid, and apply the oriented silicon steel insulation coating liquid to the upper and lower surfaces of the oriented silicon steel;

[0028] The oriented silicon steel insulation coating liquid is solidified in a drying furnace, and the plate temperature at the drying furnace outlet is controlled at 500℃~800℃;

[0029] The solidified oriented silicon steel with oriented silicon steel insulation coating is sent into a flat stretching furnace for stretching, and the tension in the flat stretching furnace is controlled at 8MPa to 12MPa.

[0030] Preferably, in the above method for improving the warpage of the finished product of oriented silicon steel, the specific gravity of the oriented silicon steel insulating coating liquid is adjusted to 1.15 g / cm3 to 1.25 g / cm3.

[0031] Preferably, in the above method for improving the warpage of oriented silicon steel products, the groove depth of the upper coating roller is adjusted to 0.10 mm to 0.16 mm, and the groove depth of the lower coating roller is adjusted to 0.12 mm to 0.18 mm.

[0032] Preferably, in the above method for improving the warpage of the finished product of grain-oriented silicon steel, the pressure of the upper coating roller and the lower coating roller when applying the grain-oriented silicon steel insulating coating liquid is controlled to be 10KN to 13KN.

[0033] Preferably, in the above method for improving the warpage of finished oriented silicon steel products, the plate temperature at the drying furnace outlet is controlled at 600°C to 700°C.

[0034] Preferably, in the above method for improving the warpage of oriented silicon steel products, the tension in the flattening and stretching furnace is controlled at 9 MPa to 11 MPa.

[0035] The following describes in detail the method for improving the warpage of oriented silicon steel products according to the present invention in combination with specific embodiments.

[0036] Example 1

[0037] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.25g / cm 3 The groove depth of the upper coating roller is 0.12mm, the groove depth of the lower coating roller is 0.16mm, the coating pressure is controlled at 11KN, the tension in the flat stretching furnace is controlled at 9MPa, the upper surface coating thickness is 2.0 microns, the lower surface coating thickness is 2.5 microns, and the drying furnace outlet plate temperature is controlled at 690℃.

[0038] Example 2:

[0039] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.25g / cm 3 The groove depth of the upper coating roller is 0.11mm, the groove depth of the lower coating roller is 0.13mm, the coating pressure is controlled at 12KN, the tension in the flat stretching furnace is controlled at 9MPa, the upper surface coating thickness is 1.8 microns, the lower surface coating thickness is 2.2 microns, and the drying furnace outlet plate temperature is controlled at 660℃.

[0040] Example 3:

[0041] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.22g / cm 3 The groove depth of the upper coating roller is 0.11mm, the groove depth of the lower coating roller is 0.12mm, the coating pressure is controlled at 12KN, the tension in the flat stretching furnace is controlled at 9.5MPa, the upper surface coating thickness is 1.6 microns, the lower surface coating thickness is 1.9 microns, and the drying furnace outlet plate temperature is controlled at 630℃.

[0042] Example 4:

[0043] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.22g / cm 3The groove depth of the upper coating roller is 0.11mm, the groove depth of the lower coating roller is 0.15mm, the coating pressure is controlled at 13KN, the tension in the flat stretching furnace is controlled at 9.5MPa, the upper surface coating thickness is 1.5 microns, the lower surface coating thickness is 2.0 microns, and the drying furnace outlet plate temperature is controlled at 630℃.

[0044] Example 5:

[0045] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.20g / cm 3 The groove depth of the upper coating roller is 0.10mm, the groove depth of the lower coating roller is 0.14mm, the coating pressure is controlled at 10KN, the tension in the flat stretching furnace is controlled at 10MPa, the upper surface coating thickness is 1.6 microns, the lower surface coating thickness is 2.3 microns, and the drying furnace outlet plate temperature is controlled at 600℃.

[0046] Example 6:

[0047] Adjust the specific gravity of the oriented silicon steel insulation coating liquid to 1.18g / cm 3 The groove depth of the upper coating roller is 0.10mm, the groove depth of the lower coating roller is 0.14mm, the coating pressure is controlled at 10KN, the tension in the flat stretching furnace is controlled at 10MPa, the upper surface coating thickness is 1.4 microns, the lower surface coating thickness is 1.9 microns, and the drying furnace outlet plate temperature is controlled at 600℃.

[0048] Example 7:

[0049] Adjust the specific gravity of the oriented silicon steel insulation coating liquid to 1.18g / cm 3 The groove depth of the upper coating roller is 0.12mm, the groove depth of the lower coating roller is 0.16mm, the coating pressure is controlled at 10KN, the tension in the flat stretching furnace is controlled at 9MPa, the upper surface coating thickness is 2.3 microns, the lower surface coating thickness is 2.9 microns, and the drying furnace outlet plate temperature is controlled at 660℃.

[0050] Example 8:

[0051] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.15g / cm 3 The groove depth of the upper coating roller is 0.12mm, the groove depth of the lower coating roller is 0.16mm, the coating pressure is controlled at 10KN, the tension in the flat stretching furnace is controlled at 11MPa, the upper surface coating thickness is 1.7 microns, the lower surface coating thickness is 2.1 microns, and the drying furnace outlet plate temperature is controlled at 690℃.

[0052] Comparative Example 1:

[0053] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.30g / cm 3The groove depth of the upper coating roller is 0.18mm, the groove depth of the lower coating roller is in the range of 0.18mm, the coating pressure is controlled at 14KN, the tension in the flat stretching furnace is controlled at 8MPa, the upper surface coating thickness is 3.5 microns, the lower surface coating thickness is 3.0 microns, and the drying furnace outlet plate temperature is controlled at 600℃.

[0054] Comparative Example 2:

[0055] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.25g / cm 3 The groove depth of the upper coating roller is 0.12mm, the groove depth of the lower coating roller is in the range of 0.12mm, the coating pressure is controlled at 12KN, the tension in the flat stretching furnace is controlled at 9MPa, the upper surface coating thickness is 2.6 microns, the lower surface coating thickness is 2.2 microns, and the drying furnace outlet plate temperature is controlled at 660℃.

[0056] Comparative Example 3:

[0057] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.20g / cm 3 The groove depth of the upper coating roller is 0.09mm, the groove depth of the lower coating roller is in the range of 0.09mm, the coating pressure is controlled at 10KN, the tension in the flat stretching furnace is controlled at 10MPa, the upper surface coating thickness is 1.7 microns, the lower surface coating thickness is 1.4 microns, and the drying furnace outlet plate temperature is controlled at 700℃.

[0058] Comparative Example 4:

[0059] Adjust the specific gravity of oriented silicon steel insulation coating liquid to 1.15g / cm 3 The groove depth of the upper coating roller is 0.06mm, the groove depth of the lower coating roller is in the range of 0.06mm, the coating pressure is controlled at 8KN, the tension in the flat stretching furnace is controlled at 12MPa, the upper surface coating thickness is 1.2 microns, the lower surface coating thickness is 1.0 microns, and the drying furnace outlet plate temperature is controlled at 750℃.

[0060] The following table shows the residual curvature of the finished products of grain-oriented silicon steel of Examples and Comparative Examples:

[0061]

[0062] In summary, compared with the prior art, the method for improving the warpage of oriented silicon steel products of the present invention has the following advantages and beneficial effects:

[0063] The present invention reduces the difference in coating thickness between the upper and lower surfaces by adjusting the specific gravity of the oriented silicon steel insulating coating liquid, the groove shape and pressure of the upper and lower coating rollers, coating curing, and tension in the furnace, thereby significantly reducing the residual curvature and maintaining stability. The proportion of residual curvature of the finished product ≤10 mm is increased from 45% to more than 98%, and the warping of the finished product is significantly improved.

[0064] It should be noted that, in this document, unless otherwise expressly specified or limited, the term "connected" or its synonyms should be interpreted broadly. For example, "connected" can mean a fixed or removable connection; a mechanical or electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication between two elements or the interaction between two elements. A person of ordinary skill in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances. Furthermore, expressions such as "first" and "second" are used solely to distinguish one entity or operation from another and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Furthermore, the terms "front," "rear," "left," "right," "upper," and "lower" herein are used with reference to the positions shown in the accompanying drawings.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for improving the warpage of oriented silicon steel products, characterized in that: The method for improving the warpage of oriented silicon steel finished products comprises: Adjust the specific gravity of the oriented silicon steel insulation coating liquid to 1.10g / cm before stretching in the flat stretching unit 3 ~1.30g / cm 3 ; Adjust the groove depth of the upper coating roller for applying the oriented silicon steel insulating coating liquid to 0.06mm~0.20mm, and adjust the groove depth of the lower coating roller for applying the oriented silicon steel insulating coating liquid to 0.06mm~0.20mm; Control the pressure of the upper coating roller and the lower coating roller to 8KN to 15KN when applying the oriented silicon steel insulation coating liquid, and apply the oriented silicon steel insulation coating liquid to the upper and lower surfaces of the oriented silicon steel; The oriented silicon steel insulation coating liquid is solidified in a drying furnace, and the plate temperature at the drying furnace outlet is controlled at 500℃~800℃; The solidified oriented silicon steel with oriented silicon steel insulation coating is sent into a flat stretching furnace for stretching, and the tension in the flat stretching furnace is controlled at 8MPa to 12MPa.

2. The method for improving warpage of a finished product of grain-oriented silicon steel according to claim 1, wherein: Adjust the specific gravity of the oriented silicon steel insulation coating liquid to 1.15g / cm 3 ~1.25g / cm 3 .

3. The method for improving warpage of a finished product of grain-oriented silicon steel according to claim 1, wherein: Adjust the groove depth of the upper coating roller to 0.10mm~0.16mm, and adjust the groove depth of the lower coating roller to 0.12mm~0.18mm.

4. The method for improving warpage of a finished product of grain-oriented silicon steel according to claim 1, wherein: The pressure of the upper coating roller and the lower coating roller when applying the oriented silicon steel insulating coating liquid is controlled to be 10KN to 13KN.

5. The method for improving warpage of a finished product of grain-oriented silicon steel according to claim 1, wherein: The plate temperature at the drying furnace outlet is controlled at 600℃~700℃.

6. The method for improving warpage of a finished product of grain-oriented silicon steel according to claim 1, wherein: The tension in the flat stretching furnace is controlled at 9MPa~11MPa.

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