Preparation method of silicon steel sheet and product thereof

Abstract

The invention provides a silicon steel sheet preparation method, and relates to the technical field of silicon steel sheet production and processing. The preparation method comprises the following steps: pretreating a silicon steel raw material to obtain an original silicon steel sheet; the original silicon steel sheet is placed on a soft magnetic tool on a laser cutter, and a pneumatic clamp is adopted to position and clamp the original silicon steel sheet; and cutting the positioned and clamped original silicon steel sheets by adopting a laser cutter to obtain a plurality of silicon steel sheets. According to the preparation method of the silicon steel sheet disclosed by the invention, by adopting a flexible production mode of combining laser cutting with the special soft magnetic tool and the pneumatic clamp, the effect of performing small-batch and high-precision processing without an expensive mold is realized, and the problems of high cost, long period and poor flexibility of a traditional mold method are effectively solved. The invention further provides a silicon steel sheet.

Description

Technical Field

[0001] This disclosure relates to the field of silicon steel sheet production and processing technology, and in particular to a method for preparing silicon steel sheets and its products. Background Technology

[0002] In current industrial applications, the silicon steel sheets used in the core components of electromagnets have manufacturing standards far exceeding those of ordinary metal sheets or the iron cores in common motors. These silicon steel sheets not only require absolute dimensional accuracy but also face extremely stringent requirements regarding overall flatness, shape precision, and consistency across large batches of products. In short, their quality directly determines the performance and stability of the electromagnet.

[0003] To meet such high standards, the industry has long relied on die-stamping for forming. This traditional method has obvious advantages: once the die is made, production efficiency is very high, and thousands of parts with highly uniform shapes and sizes can be manufactured quickly, while material waste is also low, making it very suitable for large-scale, standardized order production.

[0004] However, this mold-based production model also comes with significant limitations. The primary problem lies in the enormous upfront investment. Developing each new product requires the specialized design and precision machining of a high-precision mold, a process that is both expensive and time-consuming. Furthermore, when production demands change, or when product development and trial production are needed, the mold's flexibility becomes insufficient, making it difficult to quickly adapt to small-batch, multi-variety orders. Simultaneously, mold production is highly sensitive to fluctuations in the properties of the silicon steel sheet raw material itself; even slight errors can lead to a decrease in product qualification rates.

[0005] Therefore, the market urgently needs a new processing technology that can balance high precision and high flexibility to make up for the shortcomings of traditional mold production in terms of cost, cycle and adaptability. Summary of the Invention

[0006] In view of the above problems, embodiments of this disclosure provide a method for preparing silicon steel sheets and the product thereof.

[0007] One aspect of this disclosure provides a method for preparing silicon steel sheets, comprising: pretreating silicon steel raw materials to obtain raw silicon steel sheets; placing the raw silicon steel sheets on a soft magnetic fixture on a laser cutter, and using a pneumatic clamp to position and clamp the raw silicon steel sheets; and using a laser cutter to cut the positioned and clamped raw silicon steel sheets to obtain multiple silicon steel sheets.

[0008] According to embodiments of this disclosure, silicon steel sheets are used in electromagnets, and the thickness is less than or equal to 0.5 mm.

[0009] According to embodiments of this disclosure, pretreatment of silicon steel raw materials includes at least one of the following operations: cold rolling annealing, coil uncoiling, blending and cutting, and coating with adhesive.

[0010] According to embodiments of this disclosure, the pneumatic clamp uses compressed air as a power source and achieves positioning and clamping of the pneumatic clamp through a cylinder, a gripper mechanism, and a control system.

[0011] According to embodiments of this disclosure, the laser power of the laser cutter is 1000W~1200W, the pulse frequency is 4500Hz~5000Hz, the cutting speed is 14m / min, and the auxiliary gas is high-purity nitrogen with a purity greater than or equal to 99.99%, and the gas pressure of the high-purity nitrogen is 1.0 MPa~1.5MPa.

[0012] According to an embodiment of this disclosure, the diameter of the cutting head nozzle of the laser cutter is 1.2mm to 1.5mm, and the focal position is set to 0.5mm to 1.5mm. The laser cutter is used to cut the original silicon steel sheet after positioning and clamping, including: using a cutting head nozzle with an automatic focusing system to cut the original silicon steel sheet after positioning and clamping, so as to track the surface height of the original silicon steel sheet in real time, thereby compensating for the small deformation during the cutting process.

[0013] According to embodiments of this disclosure, the method of cutting the original silicon steel sheet after positioning and clamping using a laser cutter further includes: cutting the original silicon steel sheet after positioning and clamping using a low-energy pre-piercing method or a spiral or annular cutting method.

[0014] According to embodiments of this disclosure, the method for preparing silicon steel sheets further includes: equipping a constant temperature, constant humidity and dust removal system to prepare the silicon steel sheets in a constant temperature, constant humidity and dust-free environment.

[0015] According to embodiments of this disclosure, the method for preparing silicon steel sheets further includes: using a magnetic chuck to remove multiple silicon steel sheets from a laser cutter, and stacking the multiple silicon steel sheets in a one-for-one, one-for-two manner.

[0016] Another aspect of this disclosure provides a silicon steel sheet, which is obtained by the steps of the above method.

[0017] The method for preparing silicon steel sheets and the products disclosed herein achieve the effect of small-batch, high-precision processing without expensive molds by adopting a flexible production method that combines laser cutting with special soft magnetic tooling and pneumatic clamps. This effectively solves the problems of high cost, long cycle and poor flexibility of traditional mold methods. Attached Figure Description

[0018] The foregoing contents, as well as other objects, features, and advantages of this disclosure, will become clearer from the following description of embodiments with reference to the accompanying drawings, in which:

[0019] Figure 1 A flowchart illustrating a method for preparing silicon steel sheets according to an embodiment of the present disclosure is shown schematically.

[0020] Figure 2 A schematic diagram of the structure of a soft magnetic tooling according to an embodiment of the present disclosure is shown.

[0021] Figure 3 A schematic diagram of the cutting head nozzle according to an embodiment of the present disclosure is shown. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this disclosure clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0023] It should be noted that similar or identical parts are referred to by the same reference numerals in the accompanying drawings or description. The technical features of the various embodiments exemplified in the specification can be freely combined to form new solutions without conflict. Furthermore, each claim can stand alone as an embodiment, or the technical features in the various claims can be combined to form new embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated in a simplified or convenient manner. Moreover, elements or implementations not shown or described in the drawings are those known to those skilled in the art. Additionally, although this document provides examples of parameters containing specific values, it should be understood that the parameters need not be exactly equal to the corresponding values, but can approximate the corresponding values ​​within acceptable error tolerances or design constraints.

[0024] Unless there are technical obstacles or contradictions, the various embodiments described above in this disclosure can be freely combined to form other embodiments, all of which are within the protection scope of this disclosure.

[0025] Although this disclosure has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to illustrate preferred embodiments of this disclosure and should not be construed as limiting the disclosure. The dimensions in the drawings are merely illustrative and should not be construed as limiting the disclosure.

[0026] While some embodiments of the general concept of this disclosure have been shown and described, those skilled in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of the general concept of this disclosure, the scope of which is defined by the claims and their equivalents.

[0027] Figure 1A flowchart illustrating a method for preparing silicon steel sheets according to an embodiment of the present disclosure is shown schematically.

[0028] like Figure 1 As shown, embodiments of this disclosure provide a method for preparing silicon steel sheets, including operations S110~S130.

[0029] In operation S110, the silicon steel raw material is pretreated to obtain raw silicon steel sheets.

[0030] The silicon steel raw material used in this operation refers to the basic steel used to manufacture the core of an electromagnet, which is usually supplied in coils. Pretreatment refers to the preparation work carried out on the raw material before a series of fine processing steps, which aims to optimize its internal structure and external dimensions and apply a protective layer to obtain raw silicon steel sheets that meet the requirements of the next stage.

[0031] In some embodiments, the pretreatment of silicon steel raw materials includes at least one of the following operations: cold rolling annealing, coil uncoiling, blending and cutting, and coating.

[0032] This pretreatment process is a systematic, multi-stage operation. The first step is cold rolling and annealing, where the steel is repeatedly rolled at room temperature using a large rolling mill to precisely reduce its thickness to the target size (e.g., 0.5 mm). During this process, heat treatment (annealing) is interspersed to eliminate internal stress generated by rolling and to promote the formation of a regular crystal structure within the steel that is beneficial to its electromagnetic properties. Next is uncoiling the coil. The treated coil is unfolded, and to ensure consistent quality, the outermost and innermost layers, which have the most contact with air and the coil and are most susceptible to damage, are discarded. Subsequently, according to a pre-designed layout, the coil is cut into regular square sheets using cutting equipment and stacked into individual piles according to the roll number.

[0033] The next crucial step is material blending, where sheets are sequentially drawn from each stockpile according to the total number of silicon steel sheets required for the final product (e.g., an electromagnet). For example, if there are three stockpiles, one sheet is taken from each of the first, second, and third stockpiles to form a set, and this process is repeated to ensure that the raw materials from different rolls are uniformly mixed, thus guaranteeing the consistency of performance in batches. Finally, an adhesive coating is applied, uniformly coating an extremely thin insulating layer onto the surface of the sheets. Before mass production, rigorous process validation is essential: a certain number of uncoated sheets are randomly selected and weighed, and then weighed again after coating. The precise weight difference is used to monitor the coating thickness and uniformity. If the measurement results do not meet the standards, the parameters of the coating equipment or the concentration of the coating liquid must be adjusted, and the test repeated until the results are consistently met before mass production can begin.

[0034] Figure 2 A schematic diagram of a soft magnetic tooling according to an embodiment of the present disclosure is shown.

[0035] In operation S120, the raw silicon steel sheet is placed on the soft magnetic fixture on the laser cutter, and a pneumatic clamp is used to position and clamp the raw silicon steel sheet.

[0036] like Figure 2 As shown, the laser cutter in this operation refers to a processing device that uses a high-energy-density laser beam for precise cutting. The soft magnetic fixture is a flat support platform specifically designed to support silicon steel sheets; its material is not easily magnetized but readily magnetic, allowing it to gently hold the silicon steel sheets. The pneumatic clamp is a fixing device that uses compressed air as power, employing cylinders, mechanical grippers, and a control system to automatically clamp and release the steel.

[0037] In some embodiments, the pneumatic clamp uses compressed air as a power source and achieves positioning and clamping through cylinders, gripper mechanisms and control systems.

[0038] The core objective of this operation is to achieve precise positioning and stable fixation of the silicon steel sheet to be processed during the cutting process. The operation begins with unloading the pre-treated square raw silicon steel sheet, which is then smoothly placed on a soft magnetic fixture within the working area of ​​the laser cutter. The key function of this fixture is to provide a high-precision reference plane, effectively compensating for any slight warping that may exist in the silicon steel sheet itself, ensuring that it maintains excellent flatness from the initial processing state. At the same time, the physical properties of its surface can prevent scratches on the surface of the silicon steel sheet during movement and processing.

[0039] The clamping and positioning process is then initiated. After the operator starts the system, compressed air is fed into the cylinders as a power source, driving the connected gripper mechanism to produce precise linear motion. These grippers synchronously and evenly apply clamping force from the side or designated position of the silicon steel sheet, firmly pressing it onto the soft magnetic fixture. The entire positioning and clamping process is automatically completed by a preset program control system, eliminating uneven force or positional deviations that may be caused by human operation. This ensures that the position of each silicon steel sheet in the cutting machine is unique and precise, laying a solid foundation for subsequent high-precision laser cutting.

[0040] Figure 3 A schematic diagram of the cutting head nozzle according to an embodiment of the present disclosure is shown.

[0041] In operation S130, a laser cutter is used to cut the original silicon steel sheet after positioning and clamping to obtain multiple silicon steel sheets.

[0042] like Figure 3 As shown, the cutting in this operation refers to the process of using an extremely fine high-energy laser beam, which is focused by a lens, to irradiate a silicon steel sheet, causing the irradiated area to melt or vaporize instantly, thereby achieving separation.

[0043] In some embodiments, the diameter of the cutting head nozzle of the laser cutter is 1.2mm~1.5mm, and the focal position is set to 0.5mm~1.5mm. The laser cutter is used to cut the original silicon steel sheet after positioning and clamping, including: using the cutting head nozzle with an automatic focusing system to cut the original silicon steel sheet after positioning and clamping, so as to track the surface height of the original silicon steel sheet in real time, thereby compensating for the small deformation during the cutting process.

[0044] This operation is the final shaping process performed after the preceding steps have ensured the precise positioning of the silicon steel sheet. After the equipment is started, the laser generator produces a laser beam, which is transmitted through an optical fiber to the cutting head and focused into a high-energy spot by an internal focusing lens group. The cutting head moves above the silicon steel sheet according to a preset digitally controlled path, and the laser beam scans the sheet, cutting it into multiple silicon steel sheet units of the final designed shape and size. To ensure cutting quality, a series of parameters need to be precisely set and dynamically controlled according to the material thickness. For example, for a 0.5 mm thick silicon steel sheet, the laser power needs to be maintained within a specific range, the pulse frequency needs to be high enough to ensure continuous cuts, and the cutting head's moving speed needs to be kept stable. Simultaneously, the cutting process is accompanied by the blowing of high-pressure, high-purity nitrogen gas, which removes molten material from the kerf and obtains a clean, oxidation-free cut.

[0045] In addition, the system integrates several auxiliary functions to ensure accuracy. The autofocus system can monitor and adjust the relative position of the focal point and the material surface in real time, compensating for minute distance changes caused by unevenness or thermal deformation of the sheet material, ensuring that the laser energy is always efficiently concentrated. Before starting to cut the contour, a low-energy laser is used to create tiny starting holes in the material to avoid damage to the back of the material caused by high-energy instantaneous impact. The cutting path planning has also been optimized, for example, by using a spiral progressive or circular cutting method to reduce heat accumulation and stress concentration at contour corners, ultimately achieving smooth cuts, good perpendicularity, and precise dimensions for mass production.

[0046] In some embodiments, a constant temperature, constant humidity, and dust removal system can be provided to ensure that the silicon steel sheet is prepared in a constant temperature, constant humidity, and dust-free environment. Dynamic tracking control, utilizing a CNC system to adjust acceleration and deceleration curves in real time, ensures the roundness and surface finish of the small circle machining. Optical cooling, specifically a dual-cycle water cooling system combined with constant temperature control, can also be used to ensure stable laser output and extend the lifespan of the focusing lens.

[0047] In some embodiments, a magnetic chuck can be used to remove the plurality of silicon steel sheets from the laser cutter and stack the plurality of silicon steel sheets in an alternating pattern.

[0048] In some embodiments, silicon steel sheets are used for electromagnets and have a thickness of less than or equal to 0.5 mm. The laser power of the laser cutter is 1000W~1200W, the pulse frequency is 4500Hz~5000Hz, the cutting speed is 14m / min, and the auxiliary gas is high-purity nitrogen with a purity of greater than or equal to 99.99% and a gas pressure of 1.0 MPa~1.5MPa.

[0049] Electromagnets typically use silicon steel sheets less than 0.5mm thick, coated on both sides. When cutting thin plates less than 0.5mm thick, the high energy density of the laser beam causes the plate to heat up and evaporate rapidly, creating a kerf. However, due to the thinness of the plate, the kerf width is also relatively small, making it difficult for the heat generated during cutting to dissipate quickly. This leads to localized overheating and material lifting. This not only affects cutting quality but can also damage the cutting equipment. During thin plate cutting, heat accumulation can also cause overburning, resulting in rough cut edges or burn-through. For plates less than 0.5mm thick, the heat-affected zone has a more significant impact, potentially reducing cutting accuracy. Precise control of the laser power is crucial when cutting plates less than 0.5mm thick to avoid material lifting and overburning due to heat accumulation. Excessive power can cause rapid vaporization and spatter; insufficient power may result in incomplete cutting. The choice of cutting speed is also critical. Too high a speed may result in incomplete cutting; too slow a speed may lead to heat accumulation, affecting cutting quality. The pressure of the assist gas also significantly affects cutting quality. Excessive pressure may cause pores to form on the material surface; insufficient pressure may prevent the effective removal of molten slag, resulting in burrs that affect subsequent lamination and curing.

[0050] This application addresses the laser cutting parameter combination used for silicon steel sheets used in electromagnets with a thickness of 0.5 mm and below. Its advantage lies in the fact that through precise synergistic control, it effectively solves the core problem in thin plate cutting—thermal management and cutting stability—thereby obtaining better cutting quality.

[0051] Specifically, a laser power of 1000W to 1200W provides an energy benchmark sufficient for rapid vaporization of material, ensuring cutting efficiency without being excessively high and causing severe spatter. The high pulse frequency of 4500Hz to 5000Hz is a key advantage; it converts continuous laser energy into short, high-frequency pulses. During each pulse interval, the material is instantly cooled, significantly reducing heat accumulation and conduction to surrounding areas. This fundamentally alleviates the problems of material warping and overheating caused by overall overheating, resulting in a smooth, perpendicular cut.

[0052] A cutting speed of 14 m / min is precisely matched to this power and frequency. This speed ensures that the laser energy is fully absorbed by the material for complete cutting, while avoiding localized heat buildup caused by slow movement. Regarding the auxiliary gas, ≥99.99% high-purity nitrogen, blown under high pressure (1.0-1.5 MPa), can quickly and thoroughly remove the molten material from the cut, forming an inert gas protective environment around the cut to prevent oxidation and ensure the original metallic color and cleanliness of the cut. An appropriate pressure range ensures effective slag removal while avoiding impact on the thin plate surface or the formation of pores due to excessive pressure.

[0053] In summary, the parameters of the laser cutter in this application are not isolated numerical settings, but rather an organic system of coordinated components. Together, they achieve minimal control over the heat-affected zone of the thin silicon steel sheet, ultimately resulting in high-quality products with no warping, no overheating, and smooth, vertical cuts while maintaining high production efficiency. This lays a solid foundation for subsequent precision lamination.

[0054] Based on the silicon steel sheet preparation method disclosed in the above embodiments, the present invention also provides a silicon steel sheet. It should be noted that the details not covered in the product embodiments are similar to those in the method embodiments. Please refer to the method embodiments section for details, which will not be repeated here.

[0055] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process may be rearranged without departing from the scope of this disclosure. The appended method claims provide elements of various steps in an exemplary order and are not intended to limit the scope to a specific order or hierarchy.

[0056] It should also be noted that the directional terms mentioned in the embodiments, such as "up," "down," "front," "back," "left," and "right," are only for reference to the directions in the accompanying drawings and are not intended to limit the scope of protection of this disclosure. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted when they may cause confusion in understanding this disclosure. Furthermore, the shapes, sizes, and positional relationships of the components in the drawings do not reflect their actual size, scale, or actual positional relationships.

[0057] In the detailed description above, various features are combined together in a single embodiment to simplify this disclosure. This approach to disclosure should not be construed as reflecting an intention that embodiments of the claimed subject matter require more features than are explicitly stated in each claim. Rather, as reflected in the appended claims, this disclosure is in a state of having fewer features than all of the features of the single disclosed embodiment. Therefore, the appended claims are hereby explicitly incorporated into the detailed description, with each claim representing a separate preferred embodiment of this disclosure.

[0058] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise expressly specified. The term "comprising" as used in the specification or claims is interpreted in a manner similar to the term "including," as "including" is used as a conjunction in the claims. The use of any term "or" in the specification or claims is intended to mean "non-exclusive or."

[0059] The specific embodiments described above further illustrate the purpose, technical solutions, and beneficial effects of this disclosure. It should be understood that the above descriptions are merely specific embodiments of this disclosure and are not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A method for preparing silicon steel sheets, characterized in that, include: Pre-treatment of silicon steel raw materials yields raw silicon steel sheets; The raw silicon steel sheet is placed on a soft magnetic fixture on a laser cutter, and a pneumatic clamp is used to position and clamp the raw silicon steel sheet. The laser cutter is used to cut the original silicon steel sheet after positioning and clamping to obtain multiple silicon steel sheets.

2. The preparation method according to claim 1, characterized in that, The silicon steel sheet is used for electromagnets and has a thickness of less than or equal to 0.5 mm.

3. The preparation method according to claim 1, characterized in that, The pretreatment of silicon steel raw materials includes: The silicon steel raw material is subjected to at least one of the following operations: cold rolling annealing, coil uncoiling, blending and cutting, and adhesive coating.

4. The preparation method according to claim 1, characterized in that, The pneumatic clamp uses compressed air as a power source and achieves positioning and clamping through cylinders, gripper mechanisms and control systems.

5. The preparation method according to claim 1, characterized in that, The laser cutter has a laser power of 1000W~1200W, a pulse frequency of 4500Hz~5000Hz, a cutting speed of 14m / min, and an auxiliary gas of high-purity nitrogen with a purity greater than or equal to 99.99% and a gas pressure of 1.0 MPa~1.5MPa.

6. The preparation method according to claim 1, characterized in that, The diameter of the cutting head nozzle of the laser cutter is 1.2mm~1.5mm, and the focal position is set to 0.5mm~1.5mm. The process of using the laser cutter to cut the positioned and clamped original silicon steel sheet includes: The original silicon steel sheet is cut using a cutting head nozzle equipped with an automatic focusing system after positioning and clamping, so as to track the surface height of the original silicon steel sheet in real time and thus compensate for the small deformation during the cutting process.

7. The preparation method according to claim 1, characterized in that, The process of cutting the original silicon steel sheet after positioning and clamping using the laser cutter further includes: The original silicon steel sheet after positioning and clamping is cut using a low-energy pre-piercing method or a spiral or annular cutting method.

8. The preparation method according to claim 1, characterized in that, The preparation method further includes: Equipped with a constant temperature, constant humidity and dust removal system, the silicon steel sheet is prepared in a constant temperature, constant humidity and dust-free environment.

9. The preparation method according to claim 1, characterized in that, The preparation method further includes: The multiple silicon steel sheets are removed from the laser cutter using a magnetic chuck and stacked in a reversed arrangement.

10. A silicon steel sheet, characterized in that, It is prepared by the preparation method described in any one of claims 1 to 9.

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