CN114163227A - Preparation method for improving chamfer appearance of soft magnetic ferrite toroidal core - Google Patents
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- CN114163227A CN114163227A CN202111565251.0A CN202111565251A CN114163227A CN 114163227 A CN114163227 A CN 114163227A CN 202111565251 A CN202111565251 A CN 202111565251A CN 114163227 A CN114163227 A CN 114163227A
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
- C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
- H01F1/342—Oxides
- H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
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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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- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/658—Atmosphere during thermal treatment
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Abstract
The invention discloses a preparation method for improving the chamfer appearance of a soft magnetic ferrite toroidal core, which comprises the following steps of 1, dry pressing and forming: putting ferrite particles into a forming die, and pressing into a blank with a required shape; step 2, pretreatment: placing the formed blank into a box furnace, selecting a temperature value within the temperature range of 800-1050 ℃ for pretreatment, and then cooling the blank to room temperature; step 3, ball milling or vibration milling: putting the pretreated blank into a container filled with water and balls for ball milling or vibration milling, then taking out the treated blank from the container, cleaning and drying; and 4, high-temperature sintering: and stacking the dried blanks in a burning pot or a burning plate for high-temperature sintering to obtain the final product. The invention adds the pretreatment and ball milling processes before the magnetic core sintering, namely the production flow is the molding-pretreatment-ball milling-sintering, the burr of the magnetic core can be effectively removed, and the sintering performance and the mechanical strength after the ferrite is generated are not influenced.
Description
Technical Field
The embodiment of the invention relates to the field of soft magnetic materials, in particular to a preparation method for improving the chamfer appearance of a soft magnetic ferrite toroidal core.
Background
The soft magnetic ferrite core is dry-pressed by a ring-shaped mold. As shown in fig. 1, the mold is composed of an upper mold 1, a lower mold 2 and a concave mold 3, when the magnetic core is formed, the upper mold 1 and the lower mold 2 are matched on a central column 4, and the concave mold 3 is arranged at the periphery of the upper mold 1 and the lower mold 2. As shown in fig. 2, in the process of dry pressing, burrs and mold closing steps are likely to exist at the chamfer of the magnetic core, while an ideal toroidal magnetic core cannot have any protruding burrs or mold closing steps, the inner circle and the outer circle of the magnetic core should be smooth and flat, meanwhile, the gap of the mold should be kept small, and the chamfer of the upper mold and the lower mold of the mold should have a structure shown in a in fig. 3, but in actual production, due to the manufacturing process limitation of the mold and the easy damage during production of sharp corners of the mold, the chamfer of the upper mold and the lower mold of the mold is actually structured as shown in b in fig. 3, the formed toroidal magnetic core inevitably has burrs and mold closing steps, and has the risk of cutting the enameled wire, particularly, the magnetic core with small size, the generally wound enameled wire is thin, and the enameled wire is easily damaged, thereby causing quality problems.
At present, ball milling, vibration milling or chamfering by using a chamfering machine after sintering are generally adopted in the industry to solve the problems, but due to the characteristic that ferrite is hard and brittle, the method of adopting direct ball milling or vibration milling has the disadvantages that: (1) the removal effect is not obvious; (2) easily cause appearance defects; (3) it may cause the inductance and the temperature coefficient of the inductance of the product to vary. The chamfering mode of the chamfering machine is low in efficiency and poor in removing effect, and the magnetic core is easy to have edge beating and block falling. The above modes all affect the application effect of the magnetic core and the economic benefit of production enterprises.
Disclosure of Invention
To this end, embodiments of the present invention provide a method for improving the chamfered appearance of a soft magnetic ferrite toroidal core to solve the above-mentioned problems occurring in the prior art.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: a preparation method for improving the chamfer appearance of a soft magnetic ferrite toroidal core is characterized by comprising the following steps:
step 1, dry pressing and forming: putting ferrite particles into a forming die, and pressing into a blank with a required shape;
and 4, high-temperature sintering: and stacking the dried blanks in a burning pot or a burning plate for high-temperature sintering to obtain the final product.
Preferably, the ferrite particles in the step 1 are divided into manganese-zinc material particles and nickel-zinc material particles, and the density of a blank pressed by the manganese-zinc material particles needs to be 3.0 +/-0.1 g/cm3(ii) a The density range of blanks pressed by nickel-zinc material particles is required to be 3.3-4.2 g/cm3。
Preferably, the pretreatment time in step 2 is 1h to 2 h.
Preferably, the pretreatment apparatus in step 2 can also use a bell jar furnace or a pusher kiln.
Preferably, the temperature uniformity in step 2 is ± 3 ℃.
Preferably, the weight ratio of the blank, the ball and the water in the step 3 is 1: 2-4: 1-3, selecting brown corundum balls with the diameter of 1-6 mm, and selecting common tap water or deionized water as water.
Preferably, the time of ball milling or vibration milling in the step 3 is 5min to 30 min.
Further preferably, the sintering process of the manganese-zinc material blank and the nickel-zinc material blank in the step 4 is equally divided into a heating-up stage, a heat-preserving stage and a cooling-down stage, wherein a temperature value is selected within the temperature range of 1100-1400 ℃ in the heat-preserving stage of the manganese-zinc material blank, the heat-preserving time is 3-5 h, and the heat-preserving stage and the cooling-down stage are sintered in a balanced atmosphere; the temperature of the nickel-zinc material blank in the heat preservation stage is 900-1320 ℃, a temperature value is selected, the heat preservation time is 3-4 h, and air sintering is adopted in the heat preservation stage and the temperature reduction stage.
The invention has at least the following advantages:
the invention adds the pretreatment and ball milling processes before the magnetic core sintering, namely the production flow is the molding-pretreatment-ball milling-sintering, the burr of the magnetic core can be effectively removed, and the sintering performance and the mechanical strength after the ferrite is generated are not influenced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, should fall within the scope covered by the technical contents disclosed in the present invention without affecting the effects and the achievable purposes of the present invention.
FIG. 1 is a schematic view of a toroidal mold of a conventional soft magnetic ferrite core;
FIG. 2 is a view showing an annular mold using a conventional soft magnetic ferrite core;
FIG. 3 is an enlarged view of a portion of the upper die of FIG. 1;
FIG. 4 is a core prepared using a preparation method of an embodiment of the present invention for improving the chamfered appearance of a soft magnetic ferrite toroidal core;
wherein: 1-upper mould; 2-lower mould; 3-a female die; 4-the central column.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a preparation method for improving the chamfer appearance of a soft magnetic ferrite toroidal core, which comprises the following steps:
step 1, dry pressing and forming: loading ferrite particles into a forming die, and pressing into a blank with a required shape, wherein the ferrite particles are divided into manganese-zinc material particles and nickel-zinc material particles, and the density of the blank pressed by the manganese-zinc material particles is kept at 3.0 +/-0.1 g/cm3The density of the blank pressed by the nickel-zinc material particles is 3.3-4.2 g/cm according to different materials3；
and 4, high-temperature sintering: and stacking the dried blanks in a burning pot or a burning plate for high-temperature sintering.
In the step 2, a temperature value is selected within the temperature range of 800-1050 ℃ for heat preservation for 1-2 h, the ferrite blank is subjected to primary solid phase reaction, the blank achieves certain shrinkage, and the blank has certain strength (simultaneously, the hardness is lower than that of formal sintering).
In step 3, the buffering action of water is utilized to generate uniform friction between the ball and the magnetic core, so that the magnetic core achieves the smooth effect, and then normal high-temperature sintering is carried out according to the sintering process of the ferrite.
The sintering process of the manganese-zinc material blank in the step 4 is generally divided into a heating-up stage, a heat-preservation stage (a temperature value of 1100-1400 ℃) and a cooling-down stage, wherein the heat-preservation time of the heat-preservation stage is 3-5 h, the heat-preservation stage and the cooling-down stage adopt balanced atmosphere sintering, and the sintering equipment can also adopt a nitrogen tunnel kiln or an intelligent bell-jar type controllable atmosphere resistance furnace to obtain a final product; the sintering process of the nickel-zinc material blank is generally divided into a heating-up stage, a heat-preservation stage (a temperature value of 900-1320 ℃) and a cooling-down stage, wherein the heat-preservation time of the heat-preservation stage is 3-4 h, air sintering is adopted in the heat-preservation stage and the cooling-down stage, and a tunnel kiln or a bell jar furnace and the like can be adopted as sintering equipment to obtain a final product.
The sintering process of ferrite in step 4 is to make the blank undergo solid phase reaction under certain sintering conditions (temperature, atmosphere and time) to obtain a ferrite product with certain electromagnetic property and geometric dimension. The sintering process of the ferrite comprises a heating stage, a heat preservation stage (the general sintering temperature of the manganese-zinc material is 1100-1400 ℃ and the general sintering temperature of the nickel-zinc material is 900-1320 ℃), and a cooling stage, wherein the heating stage mainly carries out volatilization of an adhesive and initial solid phase reaction in a blank, crystal grains are gradually generated, and the blank shrinks; in the heat preservation stage, the blank achieves good densification, crystal grains are formed and grown, and the reaction is completely finished; and in the cooling stage, the oxygen partial pressure and the cooling rate are controlled, and ferrite oxidation, product cracking and the like are prevented.
The outer diameter of the ring-shaped magnetic core is 3 mm-200 mm, the scheme is more suitable for processing the ring-shaped magnetic core with the diameter of 13mm or less according to the application characteristics of the ring-shaped magnetic core, and polyimide is sprayed or coated on the periphery of the ring-shaped magnetic core with larger size.
The toroidal magnetic core manufactured by the steps 1-4 is shown in fig. 4, the toroidal magnetic core cannot have any protruding burr or die assembly step, the inner circle and the outer circle of the magnetic core are smooth and flat, the risk of cutting an enameled wire cannot exist, and the inductance temperature coefficient of a product cannot be changed.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A preparation method for improving the chamfer appearance of a soft magnetic ferrite toroidal core is characterized by comprising the following steps:
step 1, dry pressing and forming: putting ferrite particles into a forming die, and pressing into a blank with a required shape;
step 2, pretreatment: placing the formed blank into a box furnace, selecting a temperature value within the temperature range of 800-1050 ℃ for pretreatment, and then cooling the blank to room temperature;
step 3, ball milling or vibration milling: putting the pretreated blank into a container filled with water and balls for ball milling or vibration milling, then taking out the treated blank from the container, cleaning and drying;
and 4, high-temperature sintering: and stacking the dried blanks in a burning pot or a burning plate for high-temperature sintering to obtain the final product.
2. The method of claim 1A preparation method for improving the chamfer appearance of a soft magnetic ferrite toroidal core is characterized in that ferrite particles in step 1 are divided into manganese-zinc material particles and nickel-zinc material particles, and the density of a blank pressed by the manganese-zinc material particles needs to be 3.0 +/-0.1 g/cm3(ii) a The density range of blanks pressed by nickel-zinc material particles is required to be 3.3-4.2 g/cm3。
3. The method for preparing an improved soft magnetic ferrite toroidal core chamfered appearance as claimed in claim 1, wherein the pretreatment time in step 2 is 1h to 2 h.
4. The method for preparing an improved soft magnetic ferrite toroidal core chamfered appearance as claimed in claim 1, wherein the pretreatment apparatus in step 2 can further use a bell jar or pusher kiln.
5. The method for preparing an improved soft magnetic ferrite toroidal core chamfered appearance as claimed in claim 1, wherein the temperature uniformity in step 2 is ± 3 ℃.
6. The method for preparing an improved soft magnetic ferrite toroidal core chamfered appearance according to claim 1, wherein the weight ratio of the blank, the ball and the water in step 3 is 1: 2-4: 1-3, selecting brown corundum balls with the diameter of 1-6 mm, and selecting common tap water or deionized water as water.
7. The method for preparing an improved soft magnetic ferrite toroidal core chamfer appearance as claimed in claim 1, wherein the time of ball milling or vibration milling in step 3 is 5min to 30 min.
8. The method for preparing an improved soft magnetic ferrite toroidal core chamfer appearance according to claim 2, wherein the sintering process of the manganese zinc material blank and the nickel zinc material blank in the step 4 is equally divided into a heating-up stage, a heat-preserving stage and a cooling-down stage, wherein a temperature value is selected within the temperature range of 1100 ℃ to 1400 ℃ in the heat-preserving stage of the manganese zinc material blank, the heat-preserving time is 3h to 5h, and the heat-preserving stage and the cooling-down stage are sintered by adopting a balanced atmosphere; the temperature of the nickel-zinc material blank in the heat preservation stage is 900-1320 ℃, a temperature value is selected, the heat preservation time is 3-4 h, and air sintering is adopted in the heat preservation stage and the temperature reduction stage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114783753A (en) * | 2022-04-11 | 2022-07-22 | 安徽龙磁金属科技有限公司 | Intelligent production control method for soft magnetic ferrite |
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| CN102856067A (en) * | 2012-09-04 | 2013-01-02 | 深圳市金瑞中核电子有限公司 | Process for producing magnetic ring |
| CN105261472A (en) * | 2015-10-12 | 2016-01-20 | 无锡斯贝尔磁性材料有限公司 | Burr-free production technology for ferrite magnetic ring |
| CN210575512U (en) * | 2019-11-06 | 2020-05-19 | 上海康顺磁性元件厂有限公司 | EQ type soft magnetic ferrite magnetic core blank |
| CN111958369A (en) * | 2020-07-27 | 2020-11-20 | 横店集团东磁股份有限公司 | Magnet ring burr grinding device and magnet ring multi-station grinding and machining integrated production method |
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2021
- 2021-12-20 CN CN202111565251.0A patent/CN114163227A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102765025A (en) * | 2012-07-24 | 2012-11-07 | 无锡斯贝尔磁性材料有限公司 | Burr scraping equipment for manganese-zinc magnetic ring |
| CN102856067A (en) * | 2012-09-04 | 2013-01-02 | 深圳市金瑞中核电子有限公司 | Process for producing magnetic ring |
| CN105261472A (en) * | 2015-10-12 | 2016-01-20 | 无锡斯贝尔磁性材料有限公司 | Burr-free production technology for ferrite magnetic ring |
| CN210575512U (en) * | 2019-11-06 | 2020-05-19 | 上海康顺磁性元件厂有限公司 | EQ type soft magnetic ferrite magnetic core blank |
| CN111958369A (en) * | 2020-07-27 | 2020-11-20 | 横店集团东磁股份有限公司 | Magnet ring burr grinding device and magnet ring multi-station grinding and machining integrated production method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114783753A (en) * | 2022-04-11 | 2022-07-22 | 安徽龙磁金属科技有限公司 | Intelligent production control method for soft magnetic ferrite |
| CN114783753B (en) * | 2022-04-11 | 2023-07-18 | 安徽龙磁金属科技有限公司 | Intelligent production control method for soft magnetic ferrite |
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