A device and process for manufacturing a high silicon steel ultra-thin strip

Abstract

This invention provides a high-silicon steel ultra-thin strip manufacturing apparatus and process. The apparatus includes a melting furnace, a spraying assembly, a heat-insulating assembly, a cooling roller, and a traveling device. The melting furnace has a spray hole at its bottom. The spraying assembly is located below the spray hole and, from top to bottom, includes a flow channel, a nozzle cup, and a nozzle. The flow channel has an openable and closable guide channel, one end of which connects to the spray hole, and the other end connects to the nozzle cup. The nozzle is fixed to and communicates with the nozzle cup. The heat-insulating assembly heats the nozzle cup. The cooling surface at the highest point of the cooling roller is located directly below the nozzle's slit. The traveling device reciprocates the melting furnace along the axial direction of the cooling roller. This invention reduces the temperature difference between the molten steel in the nozzle and the molten steel in the melting furnace, enabling mass production of high-silicon steel ultra-thin strips with satisfactory mechanical and magnetic properties.

Description

Technical Field

[0001] This invention relates to the field of soft magnetic alloy strip preparation technology, and in particular to a high-silicon steel ultrathin strip manufacturing device and process. Background Technology

[0002] Fe-6.5wt.%Si high-silicon steel ultrathin strip is a soft magnetic tape material with low iron loss and high magnetic permeability, widely used in various high-frequency motors and high-frequency transformers. Due to its low-temperature brittleness, it is difficult to obtain qualified thin strips using conventional manufacturing methods. The industry widely adopts rapid solidification methods, that is, by rapidly cooling the molten metal, the alloy undergoes high growth rate solidification under large supercooling conditions to obtain composition, microstructure, or phase structure that cannot be obtained by traditional methods.

[0003] However, current equipment for preparing ultra-thin high-silicon steel using rapid solidification methods typically sprays molten steel from the furnace directly onto the cooling surface of the cooling roller through a nozzle. At this time, due to the huge temperature difference between the nozzle and the molten steel in the furnace, the temperature of the molten steel drops too quickly after flowing into the nozzle from its spray hole, which can easily lead to partial solidification, causing the nozzle to become clogged. This can result in failure to spray molten steel or poor strip formation, meaning that the high-silicon steel strip produced is of poor quality. Summary of the Invention

[0004] Based on this, the purpose of the present invention is to provide a high-silicon steel ultra-thin strip manufacturing device and process, which can mass-produce high-silicon steel ultra-thin strips with qualified mechanical and magnetic properties by reducing the temperature difference between the molten steel in the nozzle and the molten steel in the furnace.

[0005] On one hand, the present invention provides a high-silicon steel ultra-thin strip production device, including a melting furnace, a spraying assembly, a heat preservation assembly, a cooling roller, and a traveling device. The bottom of the melting furnace is provided with a spray hole, and the spraying assembly is located below the spray hole. The spraying assembly includes, from top to bottom, a flow channel, a nozzle cup, and a nozzle. The flow channel is provided with an opening and closing guide channel. One end of the guide channel is connected to the spray hole, and the other end of the guide channel is connected to the nozzle cup. The nozzle is fixed to and connected to the nozzle cup. The heat preservation assembly is used to heat the nozzle cup. The cooling surface at the highest point of the cooling roller is located directly below the nozzle slit. The traveling device is used to move the melting furnace back and forth along the axial direction of the cooling roller.

[0006] Furthermore, the heat preservation component includes a heating element cup and a heating element. The heating element cup is tightly attached to the body of the nozzle cup and forms an annular cavity between the heating element cup and the body of the nozzle cup. The heating element portion passes through the annular cavity and is repeatedly bent along the circumference of the annular cavity.

[0007] Furthermore, the flow channel is provided with a sliding cavity that overlaps with the flow guide channel, and a tongue plate is slidably arranged in the sliding cavity. The tongue plate is provided with a through hole that is consistent with the size and extension direction of the flow guide channel.

[0008] Furthermore, the bottom of the melting furnace is provided with a chassis, on which a mounting plate is hinged, and the shaft hole at the hinge point between the chassis and the mounting plate is set as an elongated strip, with the flow channel fixed to the mounting plate.

[0009] Furthermore, a protective sleeve is installed in the cutout of the mounting plate, and the protective sleeve has a receiving cavity, with the periphery of the heating cup abutting against the cutout at the bottom of the receiving cavity.

[0010] Furthermore, a pressure plate that covers the receiving cavity is fixedly attached to the mounting plate, the periphery of the heating cup abuts against the hollow part of the pressure plate, and the flow channel is fixedly attached to the side surface of the pressure plate near the base.

[0011] On the other hand, based on the same inventive concept, the present invention also provides a high-silicon steel ultra-thin strip manufacturing process, which applies the aforementioned high-silicon steel ultra-thin strip manufacturing device.

[0012] Furthermore, the high-silicon steel ultra-thin strip manufacturing process specifically includes the following steps:

[0013] Provide high-silicon steel ingots;

[0014] The high-silicon steel ingot is placed in the melting furnace and heated until the molten steel reaches the first preset temperature;

[0015] Use the heat preservation component to heat the nozzle cup to the second preset temperature;

[0016] The rotating cooling roller brings the linear velocity of its cooling surface to a first preset speed;

[0017] Coolant is introduced into the cooling roller so that the cooling rate of the molten steel on its cooling surface reaches the second preset rate.

[0018] Inject oxygen-consuming fuel into the nozzle;

[0019] The flow channel is opened so that the molten steel in the furnace is sprayed vertically from the nozzle slits onto the cooling surface at the highest point of the cooling roller at a preset pressure. At the same time, the furnace is moved back and forth along the axis of the cooling roller at a third preset speed by the traveling device.

[0020] Furthermore, the first preset temperature ranges from 1610℃ to 1630℃, the second preset temperature ranges from 1200℃ to 1300℃, the first preset speed ranges from 28m / s to 32m / s, and the second preset speed ranges from 3.6×10⁻⁶. 6 ℃ / s~4.0×10 6℃ / s, the preset pressure range is 18Kpa~25Kpa, and the third preset speed range is W×0.015mm / s~W×0.03mm / s, where W is the width of the high silicon steel ultra-thin strip.

[0021] The aforementioned high-silicon steel ultrathin strip manufacturing device and process, in the process of preparing high-silicon steel ultrathin strip containing 6.5wt% Si using the rapid solidification method, reduces the temperature difference between the molten steel in the melting furnace and the molten steel in the nozzle cup to an optimal range by setting a heat-insulating component between the melting furnace and the spraying component. Then, by comprehensively considering the influence of factors such as the distance between the nozzle slit and the cooling surface at the highest point of the cooling roller, the cooling roller speed, the spraying pressure, the molten steel temperature, the nozzle temperature, the moving device speed, the nozzle cup temperature, and how to prevent oxidation of the molten steel during injection, it is possible to mass-produce high-quality high-silicon steel ultrathin strip. Simultaneously, by setting a hinge structure between the chassis and the mounting plate, the heating element can be easily disassembled and reassembled. When installing the cup and nozzle cup, there is no need to disassemble the melting furnace. Simply loosen the fasteners of the hinge structure and rotate the mounting plate relative to the chassis at a certain angle. Since the melting furnace is generally made of high-temperature brittle materials, this setting can prevent damage to the melting furnace during disassembly. Moreover, since the flow channel may experience burn-out during the strip making process, specifically manifested in its height dimension gradually decreasing with the number of uses, by setting the shaft hole of the hinge structure to be elongated, the position of the mounting plate relative to the chassis can be adjusted accordingly. This avoids gaps between the nozzle and the flow channel, ensuring that the guide channel inside the flow channel remains connected to the nozzle after the size change, thus preventing leakage of high-silicon steel molten steel. Attached Figure Description

[0022] Figure 1 This is a flowchart of the high-silicon steel ultra-thin strip manufacturing process in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the high-silicon steel ultra-thin strip manufacturing device in an embodiment of the present invention;

[0024] Figure 3 This is a cross-sectional view of the cooling roller in an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional view of an embodiment of the invention that does not include the cooling roller;

[0026] Figure 5 This is a first-view structural schematic diagram of an embodiment of the present invention, excluding the cooling rollers and the melting furnace;

[0027] Figure 6 This is a schematic diagram of the structure from a second perspective in an embodiment of the present invention, excluding the cooling rollers and the melting furnace;

[0028] Figure 7This is a top view of the flow channel after it is opened, excluding the cooling rollers and the melting furnace in an embodiment of the present invention;

[0029] Figure 8 for Figure 7 A cross-sectional view at point AA in the embodiment;

[0030] Figure 9 This is a schematic diagram of the nozzle from a first-view perspective in an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the nozzle from a second perspective in an embodiment of the present invention;

[0032] Figure 11 for Figure 7 The embodiments described do not include a schematic diagram of the flow channel device;

[0033] Explanation of key component symbols:

[0034] Melting furnace 100, nozzle 110, coil 120, furnace lining material 130, crucible 140, base plate 150, mounting plate 160, shaft hole 170, protective sleeve 180, receiving cavity 181, pressure plate 190;

[0035] Injection assembly 200, flow channel 210, flow guide channel 211, slide cavity 212, tongue plate 213, through hole 214, nozzle cup 220, nozzle 230, fuel nozzle 231, nozzle slit 232, fuel filling port 233, nozzle cavity 234;

[0036] Insulation component 300, heating element cup 310, annular cavity 311, heating element 320, cooling roller 400, coolant cavity 410, coolant channel 420;

[0037] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0038] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0039] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] Due to its excellent intrinsic properties, Fe-6.5wt.%Si high-silicon steel has broad prospects for industrial applications. However, the brittleness caused by the high silicon content makes it difficult to process into thin strips using conventional rolling methods, which seriously hinders its application. Therefore, the industry widely adopts the rapid solidification method to prepare Fe-6.5wt.%Si high-silicon steel ultra-thin strips.

[0042] Although rapid solidification offers advantages such as short process, high efficiency, energy saving, and environmental friendliness, and can suppress the formation of ordered phases, thereby improving the plasticity of Fe-6.5wt.%Si high-silicon steel ultrathin strips, the high melting point of Fe-6.5wt.%Si high-silicon steel places higher demands on the refractoriness of the melting furnace and nozzles. Furthermore, factors such as superheat, nozzle size, distance between the nozzle and cooling roller, cooling roller speed, and spray pressure also affect the preparation of ultrathin strips. Moreover, the equipment used for preparing high-silicon steel ultrathin strips using rapid solidification typically involves directly spraying molten steel from the furnace onto the cooling surface of the cooling roller through a nozzle. Due to the significant temperature difference between the nozzle and the molten steel in the furnace, the molten steel cools too rapidly after flowing into the nozzle from its orifice, easily leading to partial solidification, nozzle blockage, and failure to spray molten steel, or poor strip formation, resulting in low-quality high-silicon steel strips. Therefore, this application provides a high-silicon steel ultra-thin strip manufacturing device that can mass-produce 6.5wt% Si high-silicon steel ultra-thin strips with qualified mechanical and magnetic properties.

[0043] Please refer to Figures 2 to 11This invention discloses a high-silicon steel ultra-thin strip production device, comprising: a melting furnace 100, a spraying assembly 200, a heat preservation assembly 300, a cooling roller 400, and a traveling device (not shown in the accompanying drawings). Specifically, the melting furnace 100 has a spray hole 110 at its bottom. During strip production, high-silicon steel ingots are placed in the melting furnace 100 and heated to melt until the temperature of the resulting molten high-silicon steel reaches 1610℃~1630℃. The spraying assembly 200 is located below the spray hole 110 and includes, from top to bottom, a flow channel 210, a nozzle cup 220, and a nozzle 230. The flow channel 210 has an openable and closable guide channel 211. One end of the guide channel 211 is connected to the spray hole 110, and the other end is connected to the nozzle cup 220. The nozzle 230 is fixed to and communicates with the nozzle cup 220. It should be noted that the connection here refers to ensuring that the molten high-silicon steel flows sequentially along the path of the nozzle 110, the guide channel 211, the nozzle cup 220, and the nozzle 230 without leakage during the flow.

[0044] During the strip spraying process, due to the large temperature difference between the molten steel in the melting furnace 100 and the molten steel flowing into the nozzle cup 220, the molten steel flowing into the nozzle cup 220 is prone to solidification, which can then block the nozzle cup 220 and the nozzle 230. In order to solve the problem of excessive temperature drop causing blockage of the nozzle cup 220 and the nozzle 230, a heat insulation component 300 is installed around the nozzle cup 220. Since the melting point of high silicon steel is relatively high, and general heating devices are difficult to heat the nozzle cup 220 to the melting point temperature of high silicon steel, the temperature difference between the molten steel in the melting furnace 100 and the molten steel flowing into the nozzle cup 220 should be minimized during actual strip production. Preferably, the heat insulation component 300 heats the nozzle cup 220 to 1200℃~1300℃, so that the high silicon steel molten steel can be smoothly sprayed out from the nozzle 230 during strip spraying.

[0045] The cooling surface at the highest point of the cooling roller 400 is located directly below the nozzle 230. To produce a thin strip of a certain width, a moving device (not shown in the attached drawings) causes the melting furnace 100 to reciprocate along the axial direction of the cooling roller 400 at a speed of W×0.015 mm / s to W×0.03 mm / s, where W is the width of the ultra-thin strip. For example, to produce a 60 mm wide ultra-thin strip, the corresponding moving speed is 0.9 mm / s to 1.8 mm / s. To rapidly cool the high-silicon steel molten steel on the cooling surface of the cooling roller 400, such as... Figure 3As shown, specifically, the cooling roller 400 has a coolant cavity 410 inside and a coolant channel 420 inside the rotating shaft of the cooling roller 400, which communicates with the coolant cavity 410. During use, the coolant flows in from the coolant channel 420 on one side of the cooling roller 400 and flows out from the coolant channel 420 on the other side. To improve the cooling rate of the high-silicon steel molten steel, preferably, the cooling surface of the cooling roller 400 can be made of copper.

[0046] In this embodiment, after the high-silicon steel ingot is heated and melted into high-silicon steel, an inert gas is introduced into the melting furnace 100. This allows the molten high-silicon steel to flow sequentially along the path of the nozzle 110, the guide channel 211, the nozzle cup 220, and the nozzle 230, ultimately being ejected from the nozzle 230's slit 232 at a pressure of 18 kPa to 25 kPa. By introducing an inert gas into the melting furnace 100, oxidation of the high-silicon steel can be prevented, and the pressure required for the molten high-silicon steel to be ejected from the nozzle 230's slit 232 can be provided. Furthermore, as... Figure 9 , 10 As shown, the nozzle 230 is equipped with an elongated fuel nozzle 231, a nozzle slit 232, and a fuel filling port 233. The fuel nozzle 231 and the fuel filling port 233 are connected. Inside the nozzle 230, there is a nozzle cavity 234 that holds the high-silicon steel molten steel flowing out from the nozzle cup 220. Then, under pressure, the high-silicon steel molten steel in the nozzle cavity 234 is ejected from the nozzle slit 232. During the spraying process, oxygen-consuming fuel, such as coal gas, is injected into the fuel nozzle 231 from the fuel filling port 233. When the oxygen-consuming fuel is injected, it is ejected from the fuel nozzle 231. The high-temperature high-silicon steel molten steel ignites the oxygen-consuming fuel, thereby burning off the oxygen around the nozzle slit 232 on the nozzle 230, which protects the high-silicon steel molten steel flowing out from the nozzle slit 232 from oxidation.

[0047] During the strip spraying process, the stability of the high-silicon steel molten steel flow is crucial for producing high-quality strip. Turbulent flow of the high-silicon steel can easily cause strip spraying and sparking, resulting in some strip not adhering to the cooling roller 400. This leads to insufficient cooling and sparking, causing burn defects on the strip edges. Excessive distance between the nozzle 230 and the cooling surface at the highest point of the cooling roller 400, too slow rotation speed of the cooling roller 400, and excessive spraying pressure can all affect the stability of the high-silicon steel flow. Specifically, if the distance between the nozzle 230 and the cooling surface at the highest point of the cooling roller 400 is too small, or if the spraying pressure is too low, the nozzle 230 is prone to clogging. If the cooling roller 400 rotates too fast, it can create excessive centrifugal force, making it difficult for the thin strip to adhere to the cooling roller 400, and also easily causing defects such as holes in the strip due to insufficient liquid flow. Therefore, preferably, the distance between the cooling surface at the highest point of the cooling roller 400 and the nozzle 230 is 0.25mm to 0.35mm, and the high-silicon steel molten steel is ejected from the nozzle 230 at a pressure of 18Kpa to 25Kpa.

[0048] In some alternative embodiments, such as Figure 5 , 6 As shown in Figures 7 and 11, the heat preservation assembly 300 includes a heater cup 310 and a heater 320. The heater cup 310 is arranged around the body of the nozzle cup 220, and the inner surface of the heater cup 310 is tightly attached to the body of the nozzle cup 220. An annular cavity 311 is formed between the heater cup 310 and the body of the nozzle cup 220. Optionally, the heater 320 can be a spiral resistance wire, with the resistance wire part passing through the annular cavity 311 and repeatedly bending along the circumference of the annular cavity 311. This arrangement increases the heating area of ​​the heater 320 due to the spiral heater 320 repeatedly bending along the circumference of the annular cavity 311. Furthermore, the inner surface of the heater cup 310 tightly surrounds the body of the nozzle cup 220, making the body of the nozzle cup 220 more evenly heated. This ensures that the temperature of each part of the high-silicon steel molten steel flowing into the nozzle cup 220 is uniform, which is beneficial for subsequent strip production. In addition, in order to provide a certain degree of refractory resistance without affecting the magnetic properties of the prepared strip, the flow channel 210, the heater cup 310, the nozzle cup 220, and the nozzle 230 are all made of non-magnetic refractory materials, such as brittle materials like graphite, boron nitride, silicon carbide, and corundum.

[0049] In this embodiment, by setting a heating cup 310, it is convenient to install and fix a spiral heating element 320 on it. By tightly attaching the inner surface of the heating cup 310 to the body of the nozzle cup 220, and passing the resistance wire through the annular cavity 311 and repeatedly bending and attaching it to the body of the nozzle cup 220, the heat generated by the heating element 320 after being powered on can be evenly transferred to the body of the nozzle cup 220 through the heating cup 310. Moreover, since the nozzle cup 220 is made of a fire-resistant brittle material, this setting can prevent the nozzle cup 220 from cracking due to uneven heating.

[0050] To enable the opening and closing of the flow channel 211, in some optional embodiments, a sliding cavity 212 overlapping with the flow channel 211 is provided within the flow channel 210. A tongue plate 213 is slidably disposed within the sliding cavity 212, and the tongue plate 213 has a through hole 214 that matches the size and extension direction of the flow channel 211. Optionally, the tongue plate 213 is made of a non-magnetic refractory material, such as brittle materials like graphite, boron nitride, silicon carbide, or corundum. In use, when the tongue plate 213 completely fills the space inside the sliding cavity 212, the through hole 214 and the guide channel 211 are misaligned in space. At this time, the rest of the tongue plate 213 blocks the flow of high silicon steel molten steel in the guide channel 211. When the tongue plate 213 moves outward relative to the guide device 210 until the through hole 214 and the guide channel 211 are completely overlapped, the high silicon steel molten steel can flow smoothly in the guide channel 211 and flow into the nozzle cup 220 and the nozzle cavity 234 in sequence, and finally be ejected from the nozzle 230 through the nozzle slit 232.

[0051] In some alternative embodiments, such as Figure 4 As shown, the melting furnace 100 is a crucible induction heating furnace, which includes: a coil 120, a furnace lining 130, a crucible 140, and a base 150. The furnace lining 130 is fixed on the base 150, and the crucible 140 is fixed on the furnace lining 130. The coil 120 is fixed on the base 150 and wound around the side wall of the furnace lining 130. The bottom of the crucible 140 is provided with a nozzle 110, from which high-silicon steel molten steel can flow out. A mounting plate 160 is hinged to the base 150. The shaft hole 170 at the hinge between the base 150 and the mounting plate 160 is elongated. The flow channel device 210 is fixed to the mounting plate 160 by fasteners. In addition, in order to enable the melting furnace 100 to reciprocate along the axial direction of the cooling roller 400 at a speed of W×0.015mm / s to W×0.03mm / s, the chassis 150 is fixed to the traveling device (not shown in the figure).

[0052] In this embodiment, on the one hand, by setting a hinge structure between the chassis 150 and the mounting plate 160, when disassembling and assembling the heater cup 310 and the nozzle cup 220, it is not necessary to disassemble the melting furnace 100. Only the fasteners of the hinge structure need to be loosened, and the mounting plate 160 can be rotated relative to the chassis 150 at a certain angle. In addition, the melting furnace 100 is generally made of brittle materials with high heat resistance, and disassembling the melting furnace 100 can easily cause these brittle materials to break. On the other hand, since the flow channel 210 will experience burn-out during the strip making process, specifically, its height dimension gradually decreases with the increase of the number of uses, in this embodiment, by setting the shaft hole of the hinge structure to be elongated, the position of the mounting plate 160 relative to the chassis 150 can be adjusted accordingly, avoiding the gap between the nozzle 110 and the flow channel 210, so that the guide channel 211 in the flow channel 210 after the size change is always connected to the nozzle 110, ensuring that the high silicon steel molten steel does not leak.

[0053] In some alternative embodiments, such as Figure 4-6 As shown in Figures 8 and 11, a protective sleeve 180 is installed in the central hollow section of the mounting plate 160. The protective sleeve 180 has a receiving cavity 181. The periphery of the heating cup 310 abuts against the hollow section at the bottom of the receiving cavity 181, and the periphery of the nozzle cup 220 abuts against the hollow section in the middle of the heating cup 310. Preferably, the chassis 150, mounting plate 160, and protective sleeve 180 are made of non-magnetic materials, such as austenitic stainless steel. This arrangement not only provides a certain structural rigidity and refractoriness, but also, because there is a certain leakage magnetic field around the medium-frequency induction furnace, these parts made of non-magnetic materials will not be induced by the leakage magnetic field, thus not generating heat and not affecting the structural strength.

[0054] To facilitate fixing the flow channel 210 and defining the position of the nozzle cup 220, in some alternative embodiments, such as Figure 4 , 7 As shown in Figures 8 and 11, a pressure plate 190 with a cover cavity 181 is fixedly connected to the mounting plate 160 by fasteners. The outer periphery of the heating cup 310 abuts against the hollow part of the pressure plate 190. The flow channel 210 is fixed to the side surface of the pressure plate 190 near the chassis 150.

[0055] On the other hand, please refer to Figure 1 The present invention provides a high-silicon steel ultra-thin strip manufacturing process, comprising steps S100-S700:

[0056] S100, providing high-silicon steel ingots;

[0057] High-silicon steel ingots are prepared through the following specific steps:

[0058] S110. Provide raw materials configured in the following weight percentages: 6.5% to 6.62% Si, with the remainder being Fe;

[0059] S120. Place the Si raw material and the Fe raw material into the medium-frequency induction melting furnace in sequence;

[0060] S130. After evacuating the medium-frequency induction melting furnace to a pressure of less than or equal to 50 Pa, start melting. The melting temperature is 1600℃~1640℃. After all the raw materials have melted, stir for 10~20 minutes.

[0061] S140. The stirred molten steel is poured into a mold of the corresponding size, and after natural cooling, high silicon steel ingots can be obtained.

[0062] S200. Place the high silicon steel ingot in the melting furnace 100 and heat it until the temperature of the molten steel reaches 1610℃~1630℃. The melting furnace 100 in this step can be a crucible induction heating furnace.

[0063] S300, use the heat preservation component 300 to heat the nozzle cup 220 to 1200℃~1300℃;

[0064] S400, the rotating cooling roller 400 makes the linear velocity of its cooling surface reach 28m / s to 32m / s;

[0065] S500: Coolant is introduced into the cooling roller 400 to achieve a cooling rate of 3.6 × 10⁻⁶ for the molten steel on its cooling surface. 6 ℃ / s~4.0×10 6 ℃ / s;

[0066] In this step, water can be used as the coolant. In addition, in order to achieve the corresponding cooling speed, water of the corresponding flow rate can be introduced into the cooling roller 400 according to the material and size of the cooling roller 400.

[0067] S600. Inject oxygen-consuming fuel into nozzle 230. With this configuration, when oxygen-consuming fuel is injected, it is ejected from the fuel nozzle 231 on nozzle 230. The high-temperature molten high-silicon steel ignites the oxygen-consuming fuel, thereby burning off the oxygen around the nozzle slit 232 on nozzle 230, thus protecting the molten high-silicon steel flowing out of nozzle slit 232 from oxidation. Optionally, the oxygen-consuming fuel can be coal gas.

[0068] S700, the flow channel device 210 is opened so that the molten steel in the melting furnace 100 is vertically sprayed from the nozzle 230 through the nozzle 232 at an injection pressure of 18Kpa to 25Kpa onto the cooling surface at the highest point of the cooling roller 400. At the same time, the melting furnace 100 is moved back and forth along the axial direction of the cooling roller 400 at a speed of W×0.015mm / s to W×0.03mm / s by a moving device (not shown in the figure). Where W is the width of the high silicon steel ultra-thin strip in millimeters.

[0069] It should be noted that the step numbers S100-S700 in this embodiment are only for ease of description and do not limit the order of these steps. For example, steps S200 and S300 can be performed simultaneously, steps S200 to S400 can be performed simultaneously, and steps S200 to S500 can be performed simultaneously.

[0070] In some optional embodiments, the step S200 includes the following step: introducing an inert gas into the melting furnace 100 so that the molten high-silicon steel can be ejected from the nozzle 230 at a pressure of 18 kPa to 25 kPa. In this embodiment, by introducing an inert gas into the melting furnace 100, oxidation of the molten high-silicon steel can be avoided, and the pressure required for the molten high-silicon steel to be ejected from the nozzle 230 can be provided.

[0071] For ease of explanation, a 60mm wide and 40μm thick high-silicon steel ultrathin strip is used as an example. Some properties of the ultrathin strip prepared by the above process steps are shown in Table 1:

[0072] Table 1

[0073] Serial Number Performance parameters numerical values Test conditions 1 Tensile strength (in the direction of the sprayed strip) 700Mpa - 2 Saturation magnetic induction 1800mT - 3 Maximum relative permeability 1340 - 4 Coercivity 224A / m 5 Iron loss 1 34W / Kg Frequency 1kHz, magnetic field 500mT 6 Iron loss 2 19W / Kg Frequency 5kHz, magnetic field 150mT 7 Iron loss 3 15W / Kg Frequency 10kHz, magnetic field 100mT 8 Iron loss 4 12W / Kg Frequency 20kHz, magnetic field 70mT 9 Iron loss 5 26W / Kg Frequency 40kHz, magnetic field 70mT

[0074] To regulate the microstructure and properties of the prepared high-silicon steel ultrathin strip in order to achieve optimal overall performance, in some optional embodiments, the following step is included after step S700: the prepared high-silicon steel ultrathin strip is placed in a tube furnace under inert gas protection for annealing treatment, wherein the annealing temperature is 800℃, held for 1 hour, and cooled in the furnace. For ease of illustration, a 60mm wide and 40μm thick high-silicon steel ultrathin strip is used as an example. Some properties of the high-silicon steel ultrathin strip after annealing treatment are shown in Table 2:

[0075] Table 2

[0076] Serial Number Performance parameters numerical values Test conditions 1 Tensile strength (in the direction of the sprayed strip) 500Mpa - 2 Saturation magnetic induction 1800mT - 3 Maximum relative permeability 7800 - 4 Coercivity 64A / m 5 Iron loss 1 10W / Kg Frequency 1kHz, magnetic field 500mT 6 Iron loss 2 7W / Kg Frequency 5kHz, magnetic field 150mT 7 Iron loss 3 8W / Kg Frequency 10kHz, magnetic field 100mT 8 Iron loss 4 9W / Kg Frequency 20kHz, magnetic field 70mT 9 Iron loss 5 22W / Kg Frequency 40kHz, magnetic field 70mT

[0077] The brittleness of high-silicon steel mainly originates from the ordered phases B2 and DO3. During rapid solidification and spinning, the high cooling rate inhibits the formation and transformation of the ordered phases, resulting in the prepared Fe-6.5wt%Si high-silicon steel ultrathin strip possessing excellent room-temperature mechanical properties. Tables 1 and 2 show that tensile tests conducted along the spinning direction yielded a relatively high tensile strength of 500 MPa. Furthermore, Tables 1 and 2 also indicate that annealing significantly improves the relative permeability and reduces the coercivity of the Fe-6.5wt%Si high-silicon steel ultrathin strip, and further reduces the iron loss after annealing.

[0078] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A device for producing ultra-thin high-silicon steel strips, characterized in that, The high-silicon steel ultra-thin strip manufacturing device includes: A melting furnace with a spray hole at the bottom; The spray assembly is located below the spray orifice. The spray assembly includes, from top to bottom, a flow channel, a nozzle cup, and a nozzle. The flow channel is provided with an openable and closable guide channel. One end of the guide channel is connected to the spray orifice, and the other end of the guide channel is connected to the nozzle cup. The nozzle is fixed to the nozzle cup and communicates with the nozzle cup. A heat-insulating component is used to heat the nozzle cup; The cooling roller has its cooling surface at its highest point located directly below the nozzle slit; A traveling device is used to reciprocate the melting furnace along the axial direction of the cooling roller; The distance between the cooling surface at the highest point of the cooling roller and the nozzle is 0.25mm to 0.35mm; The thermal insulation component includes: A heater cup, which surrounds and fits tightly against the body of the nozzle cup, and is in contact with the nozzle. A ring-shaped cavity is formed between the cup's body; A heating element, wherein the heating element portion passes through the annular cavity and is repeatedly bent along the circumference of the annular cavity; The flow channel is provided with a sliding cavity that overlaps with the flow guide channel. A tongue plate is slidably disposed in the sliding cavity. The tongue plate is provided with a through hole that is consistent with the size and extension direction of the flow guide channel. The bottom of the melting furnace is provided with a chassis, and a mounting plate is hinged to the chassis. The shaft hole at the hinge point between the chassis and the mounting plate is elongated. The flow channel is fixed to the mounting plate. A protective sleeve is installed in the hollow part of the mounting plate, and the protective sleeve has a receiving cavity. The periphery of the heating cup abuts against the hollow part at the bottom of the receiving cavity. A pressure plate is fixedly attached to the mounting plate to cover the receiving cavity. The periphery of the heating cup abuts against the hollow part of the pressure plate. The flow channel is fixedly attached to the side surface of the pressure plate near the chassis.

2. A process for manufacturing ultra-thin high-silicon steel strip, characterized in that, The high-silicon steel ultra-thin strip manufacturing device as described in claim 1 was applied.

3. The high-silicon steel ultra-thin strip manufacturing process according to claim 2, characterized in that, Includes the following steps: Provide high-silicon steel ingots; The high-silicon steel ingot is placed in the melting furnace and heated until the molten steel temperature reaches the first preset temperature; The heat preservation component is used to heat the nozzle cup to a second preset temperature; Rotate the cooling roller to bring the linear velocity of its cooling surface to a first preset speed; Coolant is introduced into the cooling roller so that the cooling rate of the molten steel on its cooling surface reaches a second preset rate. Inject oxygen-consuming fuel into the nozzle; The flow channel is opened, allowing molten steel in the furnace to flow vertically from the nozzle opening at a preset pressure. The liquid is sprayed directly onto the cooling surface at the highest point of the cooling roller, while the traveling device causes the melting furnace to reciprocate along the axial direction of the cooling roller at a third preset speed.

4. The high-silicon steel ultra-thin strip manufacturing process according to claim 3, characterized in that, The first preset temperature ranges from 1610℃ to 1630℃, the second preset temperature ranges from 1200℃ to 1300℃, the first preset speed ranges from 28m / s to 32m / s, the second preset speed ranges from 3.6×10⁶℃ / s to 4.0×10⁶℃ / s, the preset pressure ranges from 18Kpa to 25Kpa, and the third preset speed ranges from W×0.015mm / s to W×0.03mm / s, where W is the width of the high-silicon steel ultra-thin strip.

Images