CN110931238A - Nanocrystalline magnetic core and preparation method thereof - Google Patents
Nanocrystalline magnetic core and preparation method thereof Download PDFInfo
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- CN110931238A CN110931238A CN201911248122.1A CN201911248122A CN110931238A CN 110931238 A CN110931238 A CN 110931238A CN 201911248122 A CN201911248122 A CN 201911248122A CN 110931238 A CN110931238 A CN 110931238A
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0213—Manufacturing of magnetic circuits made from strip(s) or ribbon(s)
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/25—Magnetic cores made from strips or ribbons
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- H—ELECTRICITY
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
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Abstract
The invention provides a nanocrystalline magnetic core and a preparation method thereof. The preparation method comprises the following steps: 1) cutting the nanocrystalline strip into strips, and winding the strip-shaped nanocrystalline strip into a magnetic ring; 2) adjusting the shape of the inner ring of the magnetic ring by using a fixed core tool, and adjusting the shape of the outer ring of the magnetic ring by using a shaping tool to obtain a shaped magnetic ring; 3) impregnating the shaped magnetic ring to obtain an impregnated magnetic ring; 4) and drying and curing the impregnated magnetic ring to obtain the nanocrystalline magnetic core. The preparation method provided by the invention can be used for producing rectangular and oval amorphous nanocrystalline magnetic cores by changing the shape of the circular magnetic core, can be used for producing rectangular and oval magnetic cores with various sizes and same wall thickness, only the inner and outer tool clamps need to be replaced when the product model is replaced in production, improves the utilization rate of equipment, can be used for continuous production and improves the production efficiency.
Description
Technical Field
The invention belongs to the technical field of magnetically soft alloy magnetic cores, and relates to a nanocrystalline magnetic core and a preparation method thereof.
Background
With the development of the electronic industry, the designed specifications and shapes of electric appliance products are more and more, the requirements on high frequency, low loss and high magnetic conductivity are higher and higher, the conventional iron-nickel, iron-silicon-aluminum magnetic powder cores and other products gradually cannot meet the market requirements, the amorphous nanocrystalline magnetic core has excellent characteristics of extremely high magnetic permeability, high saturation magnetic induction intensity, low coercive force, low loss and the like, the amorphous nanocrystalline magnetic core is commented on the market consistently and well, the amorphous nanocrystalline magnetic core is widely applied, the application of the rectangular amorphous nanocrystalline magnetic core is wider and wider, the production method and equipment of the conventional amorphous nanocrystalline rectangular magnetic core are relatively lagged behind, the production process is immature, and the manufactured products cannot meet the market requirements.
Since the invention is obtained from the amorphous nanocrystalline, the production and manufacturing process and the excellent performance of the amorphous nanocrystalline are consistently and well appreciated. The nanocrystalline magnetic core has extremely high magnetic permeability, high saturation magnetic induction intensity, low coercive force and low loss. The method is suitable for occasions such as EMC/EMI filter common mode inductors, high-frequency transformers, frequency converters, current transformers and the like. The method is widely applied to the field of new energy resources, such as solar inverters, wind power generation and the like. Along with the continuous expansion of the market, the application range of the rectangular magnetic core is wider and wider, along with the development of the electronic industry in a day-to-day and month-to-month basis, the requirements on high frequency, low loss and high magnetic conductivity are higher and higher, the designed size of an electric appliance product is smaller and smaller, the market requirements cannot be met by the conventional annular magnetic core product gradually, the application market of the nanocrystalline rectangular magnetic core is gradually expanded because the amorphous nanocrystalline magnetic core has excellent characteristics of extremely high magnetic permeability, high saturation magnetic induction intensity, low coercive force, low loss and the like, and the amorphous nanocrystalline magnetic core produced by the conventional scheme cannot meet the market requirements due to the problems of production technology and scheme
CN106298218A discloses a rectangular amorphous nanocrystalline magnetic core and a preparation method thereof, the method is that cobalt element is added in raw materials of a strip material to produce a cobalt-based nanocrystalline strip material, the strip material is wound into a ring, the ring is placed in a rectangular mould, the rectangular mould is placed in an annealing furnace for heat treatment, and the end face spraying treatment is carried out after the mould is detached, so as to obtain the rectangular nanocrystalline magnetic core. But the product produced by the scheme has inaccurate structure size, is easy to deform before and after spraying, and has higher preparation cost.
CN208589358U discloses a shaping mold for a rectangular amorphous transformer magnetic core, which is characterized in that a shaping mold is added into a magnetic core, a pressing mold is arranged outside the magnetic core, the magnetic core is placed in a furnace for heat treatment, the mold is removed, glue is soaked, the mold is arranged, the glue is extruded, the magnetic core is placed in an oven for shaping, the mold is removed, and the like. However, the rectangular die of the scheme is easy to slip out due to internal stress generated by the magnetic core in the using process, and defective products can be generated; according to the scheme, the shaping die is adjusted in a mode of manually adjusting the bolt, and the precision is poor.
Disclosure of Invention
In view of the above problems in the prior art, the present invention is directed to a nanocrystalline magnetic core and a method for manufacturing the same. The preparation method provided by the invention can be used for producing rectangular and elliptical nanocrystalline magnetic cores with different specifications according to the requirements of products, and can meet the market requirements.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for preparing a nanocrystalline magnetic core, the method comprising the steps of:
(1) cutting the nanocrystalline strip into strips, and winding the strip-shaped nanocrystalline strip into a magnetic ring;
(2) adjusting the shape of the inner ring of the magnetic ring in the step (1) by using a fixed core tool, and adjusting the shape of the outer ring of the magnetic ring in the step (1) by using a shaping tool to obtain a shaped magnetic ring;
(3) impregnating the shaped magnetic ring in the step (2) to obtain an impregnated magnetic ring;
(4) and (4) drying and curing the impregnated magnetic ring in the step (3) to obtain the nanocrystalline magnetic core.
The preparation method provided by the invention can be used for producing rectangular and oval amorphous nanocrystalline magnetic cores by changing the shape of the circular magnetic core, can be used for producing rectangular and oval magnetic cores with various sizes and same wall thickness, only the inner and outer tool clamps need to be replaced when the product model is replaced in production, improves the utilization rate of equipment, can be used for continuous production and improves the production efficiency.
In the preparation method provided by the invention, the cut nanocrystalline strip can be wound into a magnetic ring with the required specification by a winding process; the fixed core tool is used for changing the annular nanocrystalline magnetic core into the nanocrystalline magnetic core in the shape of rectangle, ellipse and the like. The shaping tool is used for adjusting and changing the size and the shape of the magnetic core; the impregnation is used for absorbing partial impregnation liquid into the outer surface of the nanocrystalline magnetic core, and the product is shaped and pretreated; and drying and curing to enable the impregnation liquid adsorbed by the nanocrystalline magnetic core to be cured and shaped, so as to obtain the nanocrystalline magnetic core with the specified specification and size.
The following is a preferred technical solution of the present invention, but not a limitation to the technical solution provided by the present invention, and the technical objects and advantageous effects of the present invention can be better achieved and achieved by the following preferred technical solution.
As a preferable technical scheme of the invention, the speed of the roller shear in the step (1) is 40-70m/min, such as 40m/min, 50m/min, 60m/min or 70 m/min.
Preferably, the strips of step (1) have a width of 17-30mm, such as 17mm, 20mm, 25mm, 26mm, 27mm, 28mm, 29mm or 30mm, etc.
Preferably, the winding in step (1) is performed by an automatic winding device.
Preferably, the spot welding treatment is carried out on the fracture of the magnetic ring in the step (1) by using an electric welding machine. This is to prevent the magnetic core from being scattered at the inner and outer diameter break points.
As the preferable technical scheme of the invention, the core fixing tool in the step (2) is rectangular or oval.
Preferably, the core fixing tool in the step (2) is formed by combining a plurality of split tools. And the split type tool is adopted, so that the installation and the disassembly of the fixed core tool can be facilitated.
Preferably, the core fixing tool in the step (2) is formed by combining 2 to 5 split tools, for example, 2, 3, 4 or 5 split tools, and preferably, 3 split tools.
Preferably, when the core fixing tool in the step (2) is formed by combining 3 split tools, the 3 split tools are a middle split tool and edge split tools located on two sides of the middle split tool, and a contact surface between the middle split tool and the edge split tools is a zigzag surface. By adopting the zigzag surface, the split type tool can not slide out due to the internal stress generated by the magnetic core in the production and use processes, the size precision of the product is improved, the product size deformation is avoided, and defective products are reduced.
Preferably, the middle split tool and the edge split tool are of an integrated structure formed by connecting a rectangle and a trapezoid.
As a preferred technical scheme of the invention, the shaping tool in the step (2) is a fixture tool, and comprises a lower bottom plate and an upper bottom plate with a support frame, wherein after the lower bottom plate and the upper bottom plate with the support frame are assembled, the shape of the outer ring of the magnetic ring is adjusted by using a space surrounded by the lower bottom plate, the upper bottom plate and the support frame.
Preferably, the number of the brackets on the upper bottom plate with the brackets is 2.
Preferably, the lower bottom plate and the upper bottom plate with the support frame are fixed through a fixing piece after being assembled.
Preferably, the fixing member is a fixing bolt.
As a preferable embodiment of the present invention, the step (2) further comprises: and carrying out heat treatment on the magnetic ring before adjusting the shape of the inner ring of the magnetic ring or after adjusting the outer ring of the magnetic ring. In the invention, the purpose of heat treatment is that the nanocrystalline strip is cooled down by extremely rapid cooling, the strip generates internal stress due to unbalanced structure, the magnetic performance of the nanocrystalline is very sensitive to the internal stress, and the internal stress of the material is eliminated by heat treatment; in addition, the nanocrystalline ribbon requires a proper crystallization annealing heat treatment to obtain excellent soft magnetic properties.
Preferably, the heat treatment is performed under a protective gas atmosphere.
Preferably, the protective gas comprises nitrogen and/or argon.
Preferably, the pressure of the protective gas is 0.15-0.25MPa, such as 0.15MPa, 0.17MPa, 0.2MPa, 0.23MPa or 0.25MPa, etc.
Preferably, the protective gas is evacuated prior to the introduction of the protective gas.
Preferably, the temperature of the heat treatment is 530 ℃ to 570 ℃, such as 530 ℃, 540 ℃, 550 ℃, 560 ℃, 570 ℃ or 570 ℃ and the like.
Preferably, the time of the heat treatment is 70-100min, such as 70min, 80min, 90min or 100min and the like.
In a preferred embodiment of the present invention, the impregnation solution in the step (3) is a mixture of acetone and a high temperature glue. The mixed liquid is adopted because the curing speed is high and the mixed liquid is not easy to deform under the high-temperature use condition.
In the present invention, the high temperature glue is a glue that can be rapidly cured at a specific temperature without decomposition, such as siloxane resin, silica sol, etc.
Preferably, the mass fraction of acetone in the immersion liquid is 75-85%, such as 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, or 85%, etc., and the mass fraction of the high-temperature glue is 15-25%, such as 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, or 25%, etc.
Preferably, the impregnation time in step (3) is 10-15min, such as 10min, 11min, 12min, 13min, 14min or 15 min.
Preferably, in the step (3), the temperature of the shaped magnetic ring at the beginning of impregnation is 45-55 ℃, for example, 45 ℃, 47 ℃, 50 ℃, 52 ℃ or 55 ℃.
According to the invention, an automatic impregnation mode can be adopted, the impregnation effect is improved by automatically vacuumizing before impregnation, and the impregnation is finished by vacuumizing again to discharge redundant glue for recycling, so that the waste of materials is reduced.
As a preferred technical scheme of the invention, the temperature for drying and curing in the step (4) is 80-180 ℃, such as 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃ or 180 ℃.
Preferably, the drying and curing time in the step (4) is 80-100min, such as 80min, 85min, 90min, 95min or 100 min.
Preferably, the drying and curing in the step (4) are carried out in three stages, wherein the temperature in the first stage is 80-120 ℃, and the time is 20-30 min; the temperature of the second stage is 140-160 ℃, and the time is 20-30 min; the temperature of the third stage is 180 deg.C, and the time is 30-40 min.
As a preferred technical solution of the present invention, the preparation method further comprises: and (4) detaching the setting tool and the core fixing tool on the magnetic ring dried and cured in the step (4).
As a preferred technical scheme of the invention, the method comprises the following steps:
(1) cutting the nanocrystalline strip into strips with the width of 17-30mm at a speed of 40-70m/min, winding the strip-shaped nanocrystalline strip into a magnetic ring, and performing spot welding treatment on the fracture of the magnetic ring by using an electric welding machine;
(2) adjusting the shape of the inner ring of the magnetic ring in the step (1) by using a fixed core tool, adjusting the shape of the outer ring of the magnetic ring in the step (1) by using a shaping tool, and performing heat treatment to obtain a shaped magnetic ring;
the core fixing tool is rectangular or oval; the core fixing tool is formed by combining 3 split tools, the 3 split tools are a middle split tool and edge split tools positioned on two sides of the middle split tool, and a contact surface between the middle split tool and the edge split tools is a zigzag surface;
the shaping tool is a fixture tool and comprises a lower bottom plate and an upper bottom plate with 2 support frames, and after the lower bottom plate and the upper bottom plate with the support frames are assembled, the shape of the outer ring of the magnetic ring is adjusted by using a space surrounded by the lower bottom plate, the upper bottom plate and the 2 support frames; the lower bottom plate and the upper bottom plate with the support frame are fixed through fixing bolts after being assembled;
the heat treatment is performed before the shape of the inner ring of the magnetic ring is adjusted or after the outer ring of the magnetic ring is adjusted, and the heat treatment method comprises the following steps: placing the magnetic ring in a vacuum annealing furnace, firstly vacuumizing, then filling protective gas to the pressure of 0.15-0.25MPa, and carrying out heat treatment at 530 ℃ and 570 ℃ for 70-100 min;
(3) putting the shaped magnetic ring in the step (2) at the temperature of 45-55 ℃ into an impregnation liquid for impregnation, wherein the impregnation time is 10-15min, so as to obtain an impregnated magnetic ring;
the immersion liquid consists of acetone and high-temperature glue; in the immersion liquid, the mass fraction of acetone is 75-85%, and the mass fraction of high-temperature glue is 15-25%;
(4) drying and curing the impregnated magnetic ring in the step (3), wherein the drying and curing are carried out in three stages, the temperature of the first stage is 80-120 ℃, and the time is 20-30 min; the temperature of the second stage is 140-160 ℃, and the time is 20-30 min; and in the third stage, the temperature is 180 ℃ and the time is 30-40min, and then the setting tool and the core fixing tool are disassembled to obtain the nanocrystalline magnetic core.
In a second aspect, the present invention provides a nanocrystalline magnetic core prepared according to the preparation method of the first aspect.
Preferably, the nanocrystalline magnetic core is annular rectangular or annular elliptical.
Compared with the prior art, the invention has the following beneficial effects:
the preparation method provided by the invention can be used for producing rectangular and oval amorphous nanocrystalline magnetic cores by changing the shape of the circular magnetic core, can be used for producing rectangular and oval magnetic cores with various sizes and same wall thickness, only the inner and outer tool clamps need to be replaced when the product model is replaced in production, improves the utilization rate of equipment, can be used for continuous production and improves the production efficiency. And the product has accurate structure and size and is not easy to deform in the production process.
Drawings
Fig. 1a is a schematic structural view of the rectangular core fixing tool used in embodiment 1 after being disassembled;
FIG. 1b is a schematic view of a combined rectangular core fixing tool used in embodiment 1;
fig. 1c is a schematic perspective view of the assembled rectangular core fixing tool used in embodiment 1;
FIG. 2a is a schematic structural diagram of the rectangular shaping tool used in example 1 after being disassembled;
FIG. 2b is a schematic structural diagram of the rectangular shaping tooling used in example 1 after assembly;
FIG. 3a is a front view (schematic) of a rectangular nanocrystalline magnetic core prepared in example 1;
FIG. 3b is a left side view (schematic) of a rectangular nanocrystalline magnetic core prepared in example 1;
FIG. 4a is a schematic structural view of the elliptical core positioning fixture used in example 2 after being disassembled;
FIG. 4b is a schematic view of a combined planar structure of the oval core fixing tool used in embodiment 2;
fig. 4c is a schematic perspective view of the assembled elliptical core fixing tool used in embodiment 2;
FIG. 5a is a schematic view of the elliptical shaping tooling used in example 2 after disassembly;
FIG. 5b is a schematic view of the combined oval shaping tooling used in example 2;
FIG. 6a is a front view (schematic) of an elliptical nanocrystalline magnetic core prepared in example 2;
FIG. 6b is a left side view (schematic) of the oval nanocrystalline magnetic core prepared in example 2;
the device comprises a middle split tool, an edge split tool (left side), an edge split tool (right side), a lower bottom plate and an upper bottom plate with a support frame, wherein the middle split tool is 1, the edge split tool (left side) is 201, the edge split tool (right side) is 202, and the upper bottom plate is 4.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. The following examples are merely illustrative of the present invention and do not represent or limit the scope of the claims, which are defined by the claims.
The following are typical but non-limiting examples of the invention:
example 1
This example prepares a nanocrystalline magnetic core as follows:
(1) putting the nanocrystalline strip into a roller shearing device, rolling and shearing the nanocrystalline strip into a strip with the width of 27 +/-0.2 mm at the speed of 50m/min, winding the strip-shaped nanocrystalline strip into a magnetic ring on an automatic ring winding device, and performing spot welding treatment on the fracture of the magnetic ring by using an electric welder to prevent the inner and outer diameter fracture of the magnetic ring from scattering; the size of the magnetic ring is that the OD of the outer diameter is 35.5mm, the ID of the inner diameter is 26.9mm, and the width HT of the magnetic ring is 27 mm;
(2) adjusting the shape of an inner ring of the magnetic ring by using a core fixing tool shown in fig. 1a, 1b and 1c, wherein the core fixing tool is rectangular; the core fixing tool is formed by combining 3 split tools, the 3 split tools are a middle split tool 1 and edge split tools 201 and 202 positioned on two sides of the middle split tool 1, a contact surface between the middle split tool 1 and the edge split tools 201 and 202 is a zigzag surface, and as can be seen from fig. 1a, 1b and 1c, the middle split tool 1 and the edge split tools 201 and 202 can be regarded as an integrated structure formed by connecting the middle part of a trapezoid and the upper part and the lower part of the trapezoid and the edge split tools 201 and 202 in a rectangular manner; firstly, the edge split tools 201 and 202 on the two sides are installed in place, and then the middle split tool 1 is slowly pressed in, so that the three tools are assembled into a standard cuboid fixed core tool with the size of 35.2 × 7 × 27 mm.
Adjusting the shape of the outer ring of the magnetic ring in the step (1) by using a shaping tool shown in fig. 2a and fig. 2b, wherein the shaping tool is a fixture tool and comprises a lower bottom plate 3 and an upper bottom plate 4 with support frames, the number of the support frames is 2, and after the lower bottom plate 3 and the upper bottom plate 4 with the support frames are assembled, the shape of the outer ring of the magnetic ring is adjusted by using a space surrounded by the lower bottom plate 3, the upper bottom plate and the 2 support frames; firstly, mounting a semi-finished magnetic core with a fixed core tool into a fixed core tool, slowly pressing an upper bottom plate 4 and a lower bottom plate 3 which are matched with each other and are provided with a supporting frame through bolts, and fastening the fixing bolts to obtain a shaped magnetic ring;
(3) placing the shaped magnetic ring in a vacuum annealing furnace, firstly vacuumizing to the vacuum degree of-0.1 MPa, then filling nitrogen to the pressure of 0.2MPa, carrying out heat treatment at 550 ℃ for 90min, and opening a furnace door to take out the heat-treated magnetic ring when the temperature in the furnace is reduced to 180 ℃;
(4) placing the magnetic ring subjected to heat treatment and cooled to 50 ℃ into an impregnation liquid for impregnation, wherein the impregnation time is 10min, taking out the magnetic core from the impregnation liquid, and washing the outer surface of the magnetic core by using an acetone solution to obtain an impregnated magnetic ring;
the immersion liquid consists of acetone and high-temperature glue (siloxane resin); in the immersion liquid, the mass fraction of acetone is 80%, and the mass fraction of high-temperature glue is 20%;
(5) drying and curing the impregnated magnetic ring in a drying device, wherein the drying and curing are carried out in three stages, the temperature of the first stage is 120 ℃, and the time is 30 min; the temperature of the second stage is 160 ℃, and the time is 20 min; and in the third stage, the temperature is 180 ℃ and the time is 30min, then the rectangular magnetic core is cooled to room temperature, the external rectangular shaping tool is detached, the molded rectangular magnetic core is placed on the tool, the middle split tool 1 of the core fixing tool is detached in the reverse direction, and the edge split tools 201 and 202 on the two sides are detached after winding to obtain the rectangular nanocrystalline magnetic core.
The structure of the rectangular nanocrystalline magnetic core prepared in this example is shown in fig. 3a and 3b, where:
A＝4.8±0.2mm B＝7±0.2mm C＝35.2±0.2mm
D＝27±0.2mm E＝16.6±0.2mm F＝44.8±0.2mm。
the rectangular nanocrystalline magnetic core prepared by the embodiment has accurate structural size and is not easy to deform in the production process.
Example 2
This example prepares a nanocrystalline magnetic core as follows:
(1) putting the nanocrystalline strip into a roller shearing device, rolling and shearing the nanocrystalline strip into a strip with the width of 27 +/-0.2 mm at the speed of 50m/min, winding the strip-shaped nanocrystalline strip into a magnetic ring on an automatic ring winding device, and performing spot welding treatment on the fracture of the magnetic ring by using an electric welder to prevent the inner and outer diameter fracture of the magnetic ring from scattering; the size of the magnetic ring is that the OD of the outer diameter is 35.5mm, the ID of the inner diameter is 26.9mm, and the width HT of the magnetic ring is 27 mm;
(2) placing the magnetic ring in a vacuum annealing furnace, firstly vacuumizing to the vacuum degree of-0.2 MPa, then filling nitrogen to the pressure of 0.1MPa, carrying out heat treatment at 560 ℃ for 80min, opening a furnace door when the temperature in the furnace is reduced to 200 ℃, and taking out the heat-treated magnetic ring;
(3) the shape of the inner ring of the magnetic ring after heat treatment is adjusted by using the core fixing tool which is the same as that in the embodiment 1, the edge split tools 201 and 202 on the two sides are firstly installed in place, and then the middle split tool 1 is slowly pressed in, so that the three tools are assembled into a standard cuboid core fixing tool with the size of 35.2 x 7 x 27 mm.
Adjusting the shape of the outer ring of the magnetic ring after heat treatment by using a shaping tool which is the same as that in the embodiment 1, wherein the shaping tool is a fixture tool, mounting a semi-finished magnetic core with a fixed core tool into the shaping tool, slowly pressing an upper bottom plate 4 and a lower bottom plate 3 which are matched with each other and provided with support frames by using bolts, and fastening fixing bolts to obtain a shaped magnetic ring;
(4) placing the shaped magnetic ring cooled to 50 ℃ into an impregnation liquid for impregnation, wherein the impregnation time is 15min, taking out the magnetic core from the impregnation liquid, and washing the outer surface of the magnetic core with acetone solution to obtain an impregnated magnetic ring;
the immersion liquid consists of acetone and high-temperature glue (siloxane resin); in the immersion liquid, the mass fraction of acetone is 85 percent, and the mass fraction of high-temperature glue is 15 percent;
(5) drying and curing the impregnated magnetic ring in a drying device, wherein the drying and curing are carried out in three stages, the temperature of the first stage is 80 ℃, and the time is 20 min; the temperature of the second stage is 150 ℃, and the time is 30 min; and in the third stage, the temperature is 180 ℃ and the time is 40min, then the rectangular magnetic core is cooled to room temperature, the external rectangular shaping tool is detached, the molded rectangular magnetic core is placed on the tool, the middle split tool 1 of the core fixing tool is detached in the reverse direction, and the edge split tools 201 and 202 on the two sides are detached after winding to obtain the rectangular nanocrystalline magnetic core.
The structure and the size of the rectangular nanocrystalline magnetic core prepared by the embodiment are the same as those of the product obtained by the embodiment 1.
The rectangular nanocrystalline magnetic core prepared by the embodiment has accurate structural size and is not easy to deform in the production process.
Example 3
This example prepares a nanocrystalline magnetic core as follows:
(1) putting the nanocrystalline strip into a roller shearing device, rolling and shearing the nanocrystalline strip into a strip with the width of 17mm at the speed of 40m/min, winding the strip-shaped nanocrystalline strip into a magnetic ring on an automatic ring winding device, and performing spot welding treatment on the fracture of the magnetic ring by using an electric welder to prevent the inner and outer diameter fracture of the magnetic ring from scattering; the size of the magnetic ring is that the OD of the outer diameter is 41.04mm, the ID of the inner diameter is 32.44mm, and the width HT of the magnetic ring is 17 mm;
(2) adjusting the shape of the inner ring of the magnetic ring by using a core fixing tool as shown in fig. 4a, 4b and 4c, wherein the core fixing tool is oval; the core fixing tool is formed by combining 3 split tools, the 3 split tools are a middle split tool 1 and edge split tools 201 and 202 positioned on two sides of the middle split tool 1, a contact surface between the middle split tool 1 and the edge split tools 201 and 202 is a zigzag surface, and as can be seen from fig. 4a, 4b and 4c, the middle split tool 1 and the edge split tools 201 and 202 can be regarded as an integrated structure formed by connecting the middle part of a trapezoid and the upper part and the lower part of the trapezoid and the edge split tools 201 and 202 in a rectangular manner; firstly, the edge split tools 201 and 202 on the two sides are installed in place, and then the middle split tool 1 is slowly pressed in, so that the three tools are assembled into an oval cylinder core fixing tool.
Adjusting the shape of the outer ring of the magnetic ring in the step (1) by using a shaping tool shown in fig. 5a and 5b, wherein the shaping tool is a fixture tool and comprises a lower bottom plate 3 and an upper bottom plate 4 with supporting frames, the number of the supporting frames is 2, and after the lower bottom plate 3 and the upper bottom plate 4 with the supporting frames are assembled, the shape of the outer ring of the magnetic ring is adjusted by using a space surrounded by the lower bottom plate 3, the upper bottom plate and the 2 supporting frames; firstly, mounting a semi-finished magnetic core with a fixed core tool into a fixed core tool, slowly pressing an upper bottom plate 4 and a lower bottom plate 3 which are matched with each other and are provided with a supporting frame through bolts, and fastening the fixing bolts to obtain a shaped magnetic ring;
(3) placing the shaped magnetic ring in a vacuum annealing furnace, firstly vacuumizing to the vacuum degree of-0.25 MPa, then filling nitrogen to the pressure of 0.15MPa, carrying out heat treatment at 545 ℃ for 100min, and opening a furnace door to take out the heat-treated magnetic ring when the temperature in the furnace is reduced to 170 ℃;
(4) placing the magnetic ring subjected to heat treatment and cooled to 50 ℃ into an impregnation liquid for impregnation, wherein the impregnation time is 10min, taking out the magnetic core from the impregnation liquid, and washing the outer surface of the magnetic core by using an acetone solution to obtain an impregnated magnetic ring;
the immersion liquid consists of acetone and high-temperature glue (siloxane resin); in the immersion liquid, the mass fraction of acetone is 83 percent, and the mass fraction of high-temperature glue is 17 percent;
(5) drying and curing the impregnated magnetic ring in a drying device, wherein the drying and curing are carried out in three stages, the temperature of the first stage is 100 ℃, and the time is 30 min; the temperature of the second stage is 150 ℃, and the time is 20 min; and in the third stage, the temperature is 180 ℃ and the time is 40min, then the rectangular magnetic core is cooled to room temperature, the external rectangular shaping tool is detached, the molded rectangular magnetic core is placed on the tool, the middle split tool 1 of the core fixing tool is detached in the reverse direction, and the edge split tools 201 and 202 on the two sides are detached after winding to obtain the oval nanocrystalline magnetic core.
The structure of the elliptical nanocrystalline magnetic core prepared in this example is shown in fig. 6a and 6b, where:
A＝9.9mm B＝18.5mm C＝45.3mm
D＝53.9mm E＝17mm。
the elliptical nanocrystalline magnetic core prepared by the embodiment has accurate structure size and is not easy to deform in the production process.
Example 4
This example prepares a nanocrystalline magnetic core as follows:
(1) putting the nanocrystalline strip into a roller shearing device, rolling and shearing the nanocrystalline strip into a strip with the width of 17mm at the speed of 50m/min, winding the strip-shaped nanocrystalline strip into a magnetic ring on an automatic ring winding device, and performing spot welding treatment on the fracture of the magnetic ring by using an electric welder to prevent the inner and outer diameter fracture of the magnetic ring from scattering; the size of the magnetic ring is that the OD of the outer diameter is 41.04mm, the ID of the inner diameter is 32.44mm, and the width HT of the magnetic ring is 17 mm;
(2) placing the magnetic ring in a vacuum annealing furnace, firstly vacuumizing to the vacuum degree of-0.1 MPa, then filling nitrogen to the pressure of 0.15MPa, carrying out heat treatment at 565 ℃ for 80min, opening a furnace door when the temperature in the furnace is reduced to 180 ℃, and taking out the heat-treated magnetic ring;
(3) the shape of the inner ring of the magnetic ring after heat treatment is adjusted by using the core fixing tool which is the same as that in the embodiment 3, the edge split tools 201 and 202 on the two sides are firstly installed in place, and then the middle split tool 1 is slowly pressed in, so that three tools are assembled into an oval cylindrical core fixing tool.
Adjusting the shape of the outer ring of the magnetic ring after heat treatment by using a shaping tool which is the same as that in the embodiment 3, wherein the shaping tool is a fixture tool, firstly installing a semi-finished magnetic core with a fixed core tool installed in the shaping tool, then slowly pressing an upper bottom plate 4 and a lower bottom plate 3 which are matched with each other and are provided with supporting frames by using bolts, and fastening fixing bolts to obtain a shaped magnetic ring;
(4) placing the shaped magnetic ring cooled to 50 ℃ into an impregnation liquid for impregnation, wherein the impregnation time is 10min, taking out the magnetic core from the impregnation liquid, and washing the outer surface of the magnetic core with acetone solution to obtain an impregnated magnetic ring;
the immersion liquid consists of acetone and high-temperature glue (silicon dioxide sol); in the immersion liquid, the mass fraction of acetone is 85 percent, and the mass fraction of high-temperature glue is 15 percent;
(5) drying and curing the impregnated magnetic ring in a drying device, wherein the drying and curing are carried out in three stages, the temperature of the first stage is 80 ℃, and the time is 30 min; the temperature of the second stage is 140 ℃ and the time is 30 min; and in the third stage, the temperature is 180 ℃ and the time is 30min, then the rectangular magnetic core is cooled to room temperature, the external rectangular shaping tool is detached, the molded rectangular magnetic core is placed on the tool, the middle split tool 1 of the core fixing tool is detached in the reverse direction, and the edge split tools 201 and 202 on the two sides are detached after winding to obtain the oval nanocrystalline magnetic core.
The structure and the size of the elliptic nanocrystalline magnetic core prepared by the embodiment are the same as those of the product obtained by the embodiment 3.
The elliptical nanocrystalline magnetic core prepared by the embodiment has accurate structure size and is not easy to deform in the production process.
Comparative example 1
The method for manufacturing the nanocrystalline magnetic core according to the present comparative example is the same as the method for manufacturing the nanocrystalline magnetic core according to example 1, except that the core fixing tool and the shaping tool as described in example 1 are not used in step (2), but the rectangular mold is used to press the magnetic ring into a rectangular shape.
According to the comparison example, the core fixing tool and the shaping tool provided by the invention are not matched with each other to adjust the appearance of the magnetic core, but a rectangular die is used, so that the manufactured magnetic core is not compact in wall thickness, uneven in thickness and low in product percent of pass, and in addition, the problems of loss increase, noise increase and the like can be caused in the using process.
It can be known from the above embodiments and comparative examples that the preparation method of each embodiment produces amorphous nanocrystalline magnetic cores such as rectangular and oval by changing the shape of the circular magnetic core (magnetic ring) through the core fixing tool and the shaping tool, can produce rectangular and oval magnetic cores with various sizes and same wall thickness, and only needs to change the inner and outer tool clamps when changing the product model in production, thereby improving the equipment utilization rate, being capable of carrying out continuous production and improving the production efficiency. And the product has accurate structure and size and is not easy to deform in the production process.
Comparative example 1 does not adopt a scheme that a core fixing tool and a shaping tool are matched with each other, so that the scheme of the invention is inferior to the scheme of the invention in product size control and production flexibility.
The applicant states that the present invention is illustrated by the above examples to show the detailed process equipment and process flow of the present invention, but the present invention is not limited to the above detailed process equipment and process flow, i.e. it does not mean that the present invention must rely on the above detailed process equipment and process flow to be implemented. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.
Claims (10)
1. A method for preparing a nanocrystalline magnetic core, characterized in that the method comprises the following steps:
(1) cutting the nanocrystalline strip into strips, and winding the strip-shaped nanocrystalline strip into a magnetic ring;
(2) adjusting the shape of the inner ring of the magnetic ring in the step (1) by using a fixed core tool, and adjusting the shape of the outer ring of the magnetic ring in the step (1) by using a shaping tool to obtain a shaped magnetic ring;
(3) impregnating the shaped magnetic ring in the step (2) to obtain an impregnated magnetic ring;
(4) and (4) drying and curing the impregnated magnetic ring in the step (3) to obtain the nanocrystalline magnetic core.
2. The method according to claim 1, wherein the speed of the roller shear of step (1) is 40 to 70 m/min;
preferably, the winding in the step (1) is carried out by an automatic winding device;
preferably, the spot welding treatment is carried out on the fracture of the magnetic ring in the step (1) by using an electric welding machine.
3. The manufacturing method according to claim 1 or 2, wherein the core fixing tool in the step (2) is rectangular or elliptical;
preferably, the core fixing tool in the step (2) is formed by combining a plurality of split tools;
preferably, the core fixing tool in the step (2) is formed by combining 2-5 split tools, preferably 3 split tools;
preferably, when the core fixing tool in the step (2) is formed by combining 3 split tools, the 3 split tools are a middle split tool and edge split tools positioned at two sides of the middle split tool, and a contact surface between the middle split tool and the edge split tools is a zigzag surface;
preferably, the middle split tool and the edge split tool are of an integrated structure formed by connecting a rectangle and a trapezoid.
4. The manufacturing method according to any one of claims 1 to 3, wherein the shaping tool in step (2) is a fixture tool, and comprises a lower bottom plate and an upper bottom plate with a support frame, and after the lower bottom plate and the upper bottom plate with the support frame are assembled, the shape of the outer ring of the magnetic ring is adjusted by using a space defined by the lower bottom plate, the upper bottom plate and the support frame;
preferably, the number of the brackets on the upper bottom plate with the brackets is 2;
preferably, the lower bottom plate and the upper bottom plate with the support frame are fixed through a fixing piece after being assembled;
preferably, the fixing member is a fixing bolt.
5. The method according to any one of claims 1 to 4, wherein the step (2) further comprises: performing heat treatment on the magnetic ring before adjusting the shape of the inner ring of the magnetic ring or after adjusting the outer ring of the magnetic ring;
preferably, the heat treatment is carried out under a protective gas atmosphere;
preferably, the protective gas comprises nitrogen and/or argon;
preferably, the pressure of the protective gas is 0.15-0.25 MPa;
preferably, before the protective gas is filled, vacuumizing is performed;
preferably, the temperature of the heat treatment is 530-570 ℃;
preferably, the time of the heat treatment is 70-100 min.
6. The method according to any one of claims 1 to 5, wherein the impregnation solution in the step (3) is a mixture of acetone and a high-temperature glue;
preferably, in the immersion liquid, the mass fraction of acetone is 75-85%, and the mass fraction of high-temperature glue is 15-25%;
preferably, the impregnation time in the step (3) is 10-15 min;
preferably, in the step (3), the temperature of the shaped magnetic ring at the beginning of impregnation is 45-55 ℃.
7. The method for preparing the anti-rust paint, according to any one of claims 1 to 6, wherein the temperature for drying and curing in the step (4) is 80 to 180 ℃;
preferably, the drying and curing time in the step (4) is 80-100 min;
preferably, the drying and curing in the step (4) are carried out in three stages, wherein the temperature in the first stage is 80-120 ℃, and the time is 20-30 min; the temperature of the second stage is 140-160 ℃, and the time is 20-30 min; the temperature of the third stage is 180 deg.C, and the time is 30-40 min.
8. The method of manufacturing of claims 1-7, further comprising: and (4) detaching the setting tool and the core fixing tool on the magnetic ring dried and cured in the step (4).
9. The method for preparing according to any one of claims 1 to 8, characterized in that it comprises the steps of:
(1) cutting the nanocrystalline strip into strips with the width of 17-30mm at a speed of 40-70m/min, winding the strip-shaped nanocrystalline strip into a magnetic ring, and performing spot welding treatment on the fracture of the magnetic ring by using an electric welding machine;
(2) adjusting the shape of the inner ring of the magnetic ring in the step (1) by using a fixed core tool, adjusting the shape of the outer ring of the magnetic ring in the step (1) by using a shaping tool, and performing heat treatment to obtain a shaped magnetic ring;
the core fixing tool is rectangular or oval; the core fixing tool is formed by combining 3 split tools, the 3 split tools are a middle split tool and edge split tools positioned on two sides of the middle split tool, and a contact surface between the middle split tool and the edge split tools is a zigzag surface;
the shaping tool is a fixture tool and comprises a lower bottom plate and an upper bottom plate with 2 support frames, and after the lower bottom plate and the upper bottom plate with the support frames are assembled, the shape of the outer ring of the magnetic ring is adjusted by using a space surrounded by the lower bottom plate, the upper bottom plate and the 2 support frames; the lower bottom plate and the upper bottom plate with the support frame are fixed through fixing bolts after being assembled;
the heat treatment is performed before the shape of the inner ring of the magnetic ring is adjusted or after the outer ring of the magnetic ring is adjusted, and the heat treatment method comprises the following steps: placing the magnetic ring in a vacuum annealing furnace, firstly vacuumizing, then filling protective gas to the pressure of 0.15-0.25MPa, and carrying out heat treatment at 530 ℃ and 570 ℃ for 70-100 min;
(3) putting the shaped magnetic ring in the step (2) at the temperature of 45-55 ℃ into an impregnation liquid for impregnation, wherein the impregnation time is 10-15min, so as to obtain an impregnated magnetic ring;
the immersion liquid consists of acetone and high-temperature glue; in the immersion liquid, the mass fraction of acetone is 75-85%, and the mass fraction of high-temperature glue is 15-25%;
(4) drying and curing the impregnated magnetic ring in the step (3), wherein the drying and curing are carried out in three stages, the temperature of the first stage is 80-120 ℃, and the time is 20-30 min; the temperature of the second stage is 140-160 ℃, and the time is 20-30 min; and in the third stage, the temperature is 180 ℃ and the time is 30-40min, and then the setting tool and the core fixing tool are disassembled to obtain the nanocrystalline magnetic core.
10. A nanocrystalline magnetic core obtained by the production method according to any one of claims 1 to 9;
preferably, the nanocrystalline magnetic core is annular rectangular or annular elliptical.
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| CN114050045A (en) * | 2021-11-30 | 2022-02-15 | 横店集团东磁股份有限公司 | Nanocrystalline special-shaped magnetic core and shaping method and application thereof |
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| CN115323149A (en) * | 2022-08-08 | 2022-11-11 | 深圳市驭能科技有限公司 | Special-shaped nanocrystalline magnetic core heat treatment setting tool and setting method thereof |
| CN117747286A (en) * | 2024-01-10 | 2024-03-22 | 深圳市普乐华科技有限公司 | Nanocrystalline heat treatment device and method |
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