CN109767905A - A kind of ferromagnetic material hot press forming technology - Google Patents
A kind of ferromagnetic material hot press forming technology Download PDFInfo
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- CN109767905A CN109767905A CN201811642989.0A CN201811642989A CN109767905A CN 109767905 A CN109767905 A CN 109767905A CN 201811642989 A CN201811642989 A CN 201811642989A CN 109767905 A CN109767905 A CN 109767905A
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Abstract
The present invention relates to magnet field shaping techniques, in particular disclose a kind of ferromagnetic material hot press forming technology, include the following steps: to provide Graphene powder, magnetic powder and binder；Agitating device is provided, agitating device is mixed evenly Graphene powder, magnetic powder and binder to form magnetic powder；Molding die and device for exerting are provided, molding die is equipped with heat generating member and die cavity, die cavity is installed with agitating device treated magnetic powder, for the magnetic powder in heat transfer to die cavity that heat generating member issues with heating magnetically powder, the magnetic powder application pressure after device for exerting is heated to die cavity internal heat generation part makes magnetic powder be shaped to magnetic part；Using the characteristic of graphene, promotes the magnetic energy product of ferromagnetic material and oxidation resistance, improve the coercivity of ferromagnetic material, ensure the isotropism of ferromagnetic material；The cohesive force of binder enhancing ferromagnetic material reduces the processing and manufacturing cost of magnetic part using the hot-forming magnetic part of molding die.
Description
Technical field
The present invention relates to magnet field shaping techniques, in particular disclose a kind of ferromagnetic material hot press forming technology.
Background technique
Magnet is one of common basic accessory, and the application field of magnet is extremely wide, such as motor, magnetic suspension, electromagnet etc.
Magnet is applied to, magnet is mainly magnetized via magnet charger by magnetic part and is made, in the prior art mainly first by magnetic material
High temperature sintering forms magnetic part, is then cut again to magnetic part, is polished into semi-finished product are made, then again by semi-finished product via
Magnet charger magnetizes to form magnet.The processing technology of magnet is cumbersome, and manufacturing cost is high.In addition, the magnetic of existing magnetic material
Energy product, oxidation resistance are relatively low, and coercivity is also relatively weak, the anisotropic of magnetic material also to magnetize generate it is bad
It influences, leads to the poor performance of magnetic material, be not able to satisfy magnetic material more stringent requirement.
Summary of the invention
In order to overcome shortcoming and defect existing in the prior art, the purpose of the present invention is to provide a kind of ferromagnetic material heat
Molded technique promotes the magnetic energy product of ferromagnetic material and oxidation resistance, improves rectifying for ferromagnetic material using the characteristic of graphene
Stupid power, the isotropism for ensuring ferromagnetic material；Binder enhances the cohesive force of ferromagnetic material, utilizes the hot-forming magnetic of molding die
Property part, reduces the processing and manufacturing cost of magnetic part.
To achieve the above object, a kind of ferromagnetic material hot press forming technology of the invention, includes the following steps:
Graphene powder, magnetic powder and binder are provided；
Agitating device is provided, agitating device is for being mixed evenly Graphene powder, magnetic powder and binder to form magnetic
Property powder；
Molding die and device for exerting are provided, molding die is equipped with heat generating member and die cavity, and die cavity is for being installed with agitating device
Magnetic powder that treated, the magnetic powder in heat transfer to die cavity that heat generating member issues is with heating magnetically powder, and device for exerting is to mould
Magnetic powder after intracavitary heat generating member heating applies pressure and magnetic powder is made to be shaped to magnetic part.
Preferably, the magnetic powder in heat transfer to die cavity that the heat generating member issues is so that the temperature of magnetic powder increases
To 150-1500 DEG C.
Preferably, the magnetic powder in heat transfer to die cavity that the heat generating member issues is so that the temperature of magnetic powder increases
To fiducial temperature, fiducial temperature is greater than the fusing point of binder, and fiducial temperature is less than the fusing point of Graphene powder and the fusing point of magnetic powder.
Preferably, the molding die includes fixed form and the collapsible form that is detachably connected with fixed form, fixed
Template, collapsible form, which enclose, to be set to form die cavity, and device for exerting has kinetic pump, and kinetic pump pumps agitating device treated magnetic powder
Enter in die cavity and pressure is applied to the magnetic powder in die cavity.
Preferably, the ferromagnetic material hot press forming technology further includes following steps:
Three grinding devices are provided, graphene material, magnetic material, binder material are ground respectively and to form stone by three grinding devices
Black alkene powder, magnetic powder, binder.
Preferably, each grinding device is each equipped with the first strainer and the second strainer, the filter hole of the first strainer
Aperture less than the filter hole of the second strainer aperture, via the second strainer leak out material and by the material of the first strainer block
It is delivered to agitating device.
Preferably, the partial size of the magnetic powder and the partial size of Graphene powder are identical, and the partial size of binder is less than magnetic powder
Partial size.
Preferably, the partial size of the magnetic powder is 3-5 μm.
Preferably, the partial size of the binder is 20-35pm.
Preferably, the mass ratio of the Graphene powder, magnetic powder and binder is (1-20): (70-95): (5-10).
Preferably, the binder is made by the raw material of following parts by weight: 60-70 parts of bisphenol A type epoxy resin, high density
7-12 parts of polyethylene, 5-8 parts of melamino-formaldehyde resin, 4-7 parts of gas phase nano silica, 3-5 parts of polydimethylsiloxane, three hydroxyl first
3-5 parts of base ethane, 3-5 parts of stearic acid, 2-4 parts of the third ammonia of lignocaine.
Preferably, the preparation method of the binder the following steps are included: in proportion mix each component in the molten state
Binder mixture is obtained after closing uniformly, then handles binder mixture to obtain binder.
Binder of the invention and the binding force of magnetic powder and Graphene powder are strong, and attachment uniformly, has magnetic part excellent
Good mechanical performance and corrosion resistance, machinability is good, and product density obtained is evenly distributed, is unlikely to deform, and is less prone to side
Angle lacks material, generates the defects of flow liner, and stable product quality advantageously reduces the processing and manufacturing cost of magnetic part.
The present invention is by matching bisphenol A type epoxy resin 6, high density polyethylene (HDPE) and melamino-formaldehyde resin, as base
Body ingredient makes binder obtained have good caking property and mechanical property, and by adding gas phase nano silica, gathering
Dimethylsilane, trimethylolethane, stearic acid, the third ammonia of lignocaine, can improve binder and magnetic powder and Graphene powder
Compatibility, improve its dispersion effect, improve the stability of magnetic part, improve the dimensional accuracy of its material, reduce its surface lack
It falls into.
Gas phase nano silica has more surface micropore, has large specific surface area and the adsorbed hydroxyl content height etc. excellent
Point, it is good with other organic principle compatibilities in binder, it can be dispersed in binder system, improve the water-fast of binder
Property and adhesion strength, and make magnetic part have good mechanical property.Stearic acid can reduce binder, magnetic powder and graphene
The friction of powder integral system and mould inner surface reduces loss, reduces cost convenient for molding and demoulding.Melamino-formaldehyde resin can
Copolymer molecule in system is connected to form the reticular structure of crosslinking, bonding force, the solvent resistant of binder can be improved
Ability, and its heat resistance is improved, increase cohesive strength, improves the adhesive property of binder, comprehensive performance is superior.
Preferably, the magnetic powder is Nd-Fe-B powder.
Beneficial effects of the present invention: it using the characteristic of graphene, promotes the magnetic energy product of ferromagnetic material and oxidation resistance, mentions
The coercivity of high ferromagnetic material, the isotropism for ensuring ferromagnetic material；Binder enhances the cohesive force of ferromagnetic material, utilizes molding
Mould heat pressure forming magnetic part reduces the processing and manufacturing cost of magnetic part.
Detailed description of the invention
Fig. 1 is topology layout block diagram of the invention.
Appended drawing reference includes:
1-agitating device 2-molding die, 3-device for exerting
4-heat generating member 5-die cavity, 6-grinding devices.
Specific embodiment
For the ease of the understanding of those skilled in the art, the present invention is made further below with reference to examples and drawings
Bright, the content that embodiment refers to not is limitation of the invention.
Embodiment 1
Refering to Figure 1, a kind of ferromagnetic material hot press forming technology of the invention, includes the following steps:
Graphene powder, magnetic powder and binder are provided；
Agitating device 1 is provided, in use process, is pressed black alkene powder, magnetic powder and binder using extraneous conveying device
It is delivered in agitating device 1 according to pre-set weight ratio, agitating device 1 is used for Graphene powder, magnetic powder and binder
It is mixed evenly to form magnetic powder；
Molding die 2 and device for exerting 3 are provided, molding die 2 is equipped with heat generating member 4 and die cavity 5, and die cavity 5 is stirred for being installed with
Be formed by magnetic powder after mixing 1 mixing of device processing, the magnetic powder in heat transfer to die cavity 5 that heat generating member 4 issues with
Heating magnetically powder, the magnetic powder application pressure after device for exerting 3 is heated to 5 internal heat generation part 4 of die cavity make magnetic powder via hot pressing
It is shaped to magnetic part.
Using the characteristic of the graphene in magnetic part, the magnetic energy product and oxidation resistance of ferromagnetic material are promoted, it is ensured that magnetic
The magnetism of magnet unit volume made of part is stronger, and magnet made of magnetic part is avoided to be denaturalized by the oxidation of external environment；
The coercivity for improving ferromagnetic material, delays magnet demagnetizing factor made of magnetic part, it is ensured that the performance of the magnetic size of magnet is stablized；
Ensure the isotropism of ferromagnetic material, polar magnet needed for easily magnetizing out convenient for magnet charger；Binder enhances ferromagnetic material
Cohesive force, reduce magnet made of magnetic part by extraneous collision loose probability；Utilize the disposable hot pressing of molding die 2
Forming magnetic part can process the die cavity 5 of required shape according to required shape on molding die 2, without to magnetic part into
Row cutting, grinding, simplify the machine-shaping process of magnetic part, reduce the processing and manufacturing cost of magnetic part.
The magnetic powder in heat transfer to die cavity 5 that the heat generating member 4 issues is so that the temperature of magnetic powder is increased to
150-1500℃；Preferably, heat generating member 4 issue heat transfer to die cavity 5 in magnetic powder so that magnetic powder temperature liter
It up to 500 DEG C, so that the magnetic powder in die cavity 5 is in the condition of high temperature, is blended in magnetic powder, matches so that binder sufficiently melts
Close the pressure state of device for exerting 3, it is ensured that the magnetic powder in die cavity 5 forms fine and close firm magnetic part, promotes the close of magnetic part
Degree and adhesion strength.
The magnetic powder in heat transfer to die cavity 5 that the heat generating member 4 issues is so that the temperature of magnetic powder is increased to base
Quasi- temperature, fiducial temperature are greater than the fusing point of binder, it is ensured that binder can sufficiently melt, and fiducial temperature is less than Graphene powder
The fusing point of fusing point and magnetic powder avoids Graphene powder, magnetic powder from being denaturalized because high temperature influences, is guaranteeing magnetic part self-strength
Under the premise of, it is ensured that the performance of magnetic part.
The molding die 2 includes fixed form and the collapsible form being detachably connected with fixed form, fixed form, work
Moving template, which encloses, to be set to form die cavity 5, and device for exerting 3 has kinetic pump, and treated that magnetic powder is pumped into mould by agitating device 1 for kinetic pump
Apply pressure in chamber 5 and to the magnetic powder in die cavity 5, it is ensured that the magnetic powder in die cavity 5 is in high pressure conditions.Certainly, according to need
It wants, device for exerting 3 can also be vacuum evacuation device, and vacuum evacuation device vacuumizes die cavity 5, and then guarantees in die cavity 5
Magnetic powder is in high-pressure state.
The ferromagnetic material hot press forming technology further includes following steps:
Three grinding devices 6 are provided, graphene material, magnetic material, binder material are ground and to be formed respectively by three grinding devices 6
Graphene powder, magnetic powder, binder, the outputting material (i.e. Graphene powder, magnetic powder, binder) of three grinding devices 6 is respectively
It is delivered in agitating device 1 via output device according to predetermined weight ratio, realizes automatic production and the magnetic part of magnetic material
Automatic moulding, service hoisting magnet manufacture the degree of automation, it is ensured that magnet production quality stability.
Each grinding device 6 is each equipped with the first strainer and the second strainer, and the aperture of the filter hole of the first strainer is small
In the aperture of the filter hole of the second strainer, the material that is leaked out via the second strainer and it is delivered to by the material of the first strainer block
Agitating device 1 is considered using the second strainer and the material beyond pre-determined granules size is avoided to drop except the material beyond pre-determined granules size
The adhesion strength of low magnetic part itself；Considered using the first strainer except the material less than pre-determined granules size, prevents from being less than predetermined
The material of grain granularity influences the size of magnetic force after magnetic part magnetizes, it is ensured that the quality stability of magnetic part.
The partial size of the magnetic powder and the partial size of Graphene powder are identical, and the partial size of binder is less than the partial size of magnetic powder, make
It obtains adhesive particle to be filled between magnetic powder particles and the gap of Graphene powder particle, it is ensured that magnetic part itself adhesion strength
Uniformity.
Preferably, the partial size of the magnetic powder is 3-5 μm, and the partial size of the binder is 20-35pm, 1pm=1 μm/
1000, so that the circumference " encirclement " of each magnetic powder particles, each Graphene powder particle has multiple adhesive particles, really
Retentivity powder can be adequately uniformly mixed, while ensure that the adhesion strength of magnetic part itself maximizes, and magnetic part is prevented to be easy
Fragmentation.
In the present embodiment, the magnetic powder is Nd-Fe-B powder, and magnet made of magnetic part is strong magnets.
Embodiment 2
In the present embodiment, the mass ratio of the Graphene powder, magnetic powder and binder is 10:80:8.
In the present embodiment, the binder is made by the raw material of following parts by weight: 65 parts of bisphenol A type epoxy resin, highly dense
Spend 9 parts of polyethylene, 6 parts of melamino-formaldehyde resin, 5 parts of gas phase nano silica.4 parts of polydimethylsiloxane, trimethylolethane 4
Part, 4 parts of stearic acid, 3 parts of the third ammonia of lignocaine.
Ground is relatively stated, the preparation method of the binder the following steps are included: in proportion mix each component in the molten state
Binder mixture is obtained after closing uniformly, then handles binder mixture to obtain binder.
Remaining content of the present embodiment is with embodiment 1, and which is not described herein again.
Embodiment 3
In the present embodiment, the mass ratio of the Graphene powder, magnetic powder and binder is 1:70:5.
In the present embodiment, the binder is made by the raw material of following parts by weight: 60 parts of bisphenol A type epoxy resin, highly dense
Spend polyethylene 7- parts, 5 parts of melamino-formaldehyde resin, 4 parts of gas phase nano silica, 3 parts of polydimethylsiloxane, trimethylolethane
3 parts, 3 parts of stearic acid, 2 parts of the third ammonia of lignocaine.
In the present embodiment, the preparation method of the binder is the following steps are included: in proportion by each component in molten condition
Under obtain binder mixture after mixing, then handle binder mixture to obtain binder.
Remaining content of the present embodiment is with embodiment 1, and which is not described herein again.
Embodiment 4
In the present embodiment, the mass ratio of the Graphene powder, magnetic powder and binder is 20:95:10.
In the present embodiment, the binder is made by the raw material of following parts by weight: 70 parts of bisphenol A type epoxy resin, highly dense
Spend 12 parts of polyethylene, 8 parts of melamino-formaldehyde resin, 7 parts of gas phase nano silica.5 parts of polydimethylsiloxane, trimethylolethane
5 parts, 5 parts of stearic acid, 4 parts of the third ammonia of lignocaine.
In the present embodiment, the preparation method of the binder is the following steps are included: in proportion by each component in molten condition
Under obtain binder mixture after mixing, then handle binder mixture to obtain binder.
Remaining content of the present embodiment is with embodiment 1, and which is not described herein again.
The above is only a preferred embodiment of the present invention, for those of ordinary skill in the art, according to the present invention
Thought, there will be changes in the specific implementation manner and application range, and the content of the present specification should not be construed as to the present invention
Limitation.
Claims (10)
1. a kind of ferromagnetic material hot press forming technology, which comprises the steps of:
Graphene powder, magnetic powder and binder are provided；
Agitating device is provided, agitating device is for being mixed evenly Graphene powder, magnetic powder and binder to form magnetic powder；
Molding die and device for exerting are provided, molding die is equipped with heat generating member and die cavity, and die cavity is for being installed with agitating device processing
Magnetic powder afterwards, the magnetic powder in heat transfer to die cavity that heat generating member issues is with heating magnetically powder, and device for exerting is into die cavity
Magnetic powder after heat generating member heating applies pressure and magnetic powder is made to be shaped to magnetic part.
2. ferromagnetic material hot press forming technology according to claim 1, it is characterised in that: the heat that the heat generating member issues
The magnetic powder being transferred in die cavity is so that the temperature of magnetic powder is increased to 150-1500 DEG C.
3. ferromagnetic material hot press forming technology according to claim 1, it is characterised in that: the heat that the heat generating member issues
For the magnetic powder being transferred in die cavity so that the temperature of magnetic powder is increased to fiducial temperature, fiducial temperature is greater than the molten of binder
Point, fiducial temperature are less than the fusing point of Graphene powder and the fusing point of magnetic powder.
4. ferromagnetic material hot press forming technology according to claim 1, it is characterised in that: the molding die includes fixing
Template and the collapsible form being detachably connected with fixed form, fixed form, collapsible form, which enclose, to be set to form die cavity, device for exerting tool
Dynamic pump, treated that magnetic powder is pumped into die cavity and applies pressure to the magnetic powder in die cavity by agitating device for kinetic pump.
5. ferromagnetic material hot press forming technology according to claim 1, which is characterized in that the ferromagnetic material is hot-forming
Technique further includes following steps:
Three grinding devices are provided, graphene material, magnetic material, binder material are ground respectively and to form graphene by three grinding devices
Powder, magnetic powder, binder.
6. ferromagnetic material hot press forming technology according to claim 5, it is characterised in that: each grinding device is matched
Be equipped with the first strainer and the second strainer, the aperture of the filter hole of the first strainer less than the filter hole of the second strainer aperture, via
Second strainer leak out material and agitating device is delivered to by the material of the first strainer block.
7. ferromagnetic material hot press forming technology according to claim 1, it is characterised in that: the Graphene powder, magnetic powder
And the mass ratio of binder is (1-20): (70-95): (5-10).
8. ferromagnetic material hot press forming technology according to claim 1, it is characterised in that: the magnetic powder is neodymium iron boron
Powder, the partial size of the magnetic powder are 3-5 μm.
9. ferromagnetic material hot press forming technology according to claim 1, it is characterised in that: the partial size of the binder is
20-35pm。
10. ferromagnetic material hot press forming technology according to claim 1, it is characterised in that: the binder is by following heavy
The raw material for measuring part is made: 60-70 parts of bisphenol A type epoxy resin, 7-12 parts of high density polyethylene (HDPE), 5-8 parts of melamino-formaldehyde resin, gas
4-7 parts of phase nano silica, 3-5 parts of polydimethylsiloxane, 3-5 parts of trimethylolethane, 3-5 parts of stearic acid, lignocaine
Third 2-4 parts of ammonia.
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| CN201811642989.0A CN109767905B (en) | 2018-12-29 | 2018-12-29 | Magnet material hot press molding process |
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| CN105905421A (en) * | 2016-05-20 | 2016-08-31 | 成都德兴磁业有限公司 | Material charging box for bonding of neodymium iron boron magnet |
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|---|---|---|---|---|
| CN101593590A (en) * | 2009-04-10 | 2009-12-02 | 华中科技大学 | A kind of preparation method of warm compaction molding phenolic resin bonded Nd-Fe-B magnet |
| CN202290552U (en) * | 2011-10-14 | 2012-07-04 | 桐乡市朗基电子材料有限公司 | Magnetic powder vibrating screen |
| CN103212714A (en) * | 2013-04-27 | 2013-07-24 | 安徽大地熊新材料股份有限公司 | Method for preparing neodymium iron boron material |
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Effective date of registration: 20211224 Address after: 523000 Xiaohe Village Industrial Zone, Daojiao Town, Dongguan City, Guangdong Province Patentee after: JIN KUN MAGNET Co.,Ltd. Address before: 523000 Room 202, unit 2, building 20, jinghuwanpan, 28 Binhe Road, Xinji community, Nancheng District, Dongguan City, Guangdong Province Patentee before: Chen Liang |