CN109133898A - A kind of permanent-magnet ferrite production method for low noise magneto - Google Patents
A kind of permanent-magnet ferrite production method for low noise magneto Download PDFInfo
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- CN109133898A CN109133898A CN201811049657.1A CN201811049657A CN109133898A CN 109133898 A CN109133898 A CN 109133898A CN 201811049657 A CN201811049657 A CN 201811049657A CN 109133898 A CN109133898 A CN 109133898A
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- permanent
- ferrite
- magnet ferrite
- magnet
- low noise
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/2608—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead
- C04B35/2633—Compositions containing one or more ferrites of the group comprising manganese, zinc, nickel, copper or cobalt and one or more ferrites of the group comprising rare earth metals, alkali metals, alkaline earth metals or lead containing barium, strontium or calcium
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The invention discloses a kind of permanent-magnet ferrite production methods for low noise magneto, it is arranged under the external magnetic field of hydraulic press magnetizing coil by magnetic aligning by the fine ferrite particle in the slurry, to the ripe base of permanent-magnet ferrite, use skive machining, obtain the ferrite product of customer requirement size, after using skive machining, the intermediate grinding allowance d0 of the ripe base of the permanent-magnet ferrite is between 0.3 ~ 0.7mm, and the two sides grinding allowance d1 of the ripe base of the permanent-magnet ferrite is between 0.8 ~ 1.2mm.This permanent-magnet ferrite production method for low noise magneto of the invention, overcome the drawback in traditional eccentric scheme, the shape of the permanent-magnet ferrite made is not eccentric, and guarantee that magnetic flux does not decline, and the Surface field waveform of permanent-magnet ferrite working face can be made to be distributed in sinuous state, realize the purpose of noise reduction, suitable for low noise magneto, production method is reliable and practical, is skillfully constructed, and has a good application prospect.
Description
Technical field
The present invention relates to permanent-magnet ferrite processing technique fields, and in particular to a kind of permanent magnetism for low noise magneto
Ferrite production method.
Background technique
With the fast development of going from strength to strength for Global Auto industry size, especially new-energy automobile, magneto
Demand is increasing, and main application type has: ABS motor, starter motor, seat motor, door and window system motor, oil pump horse
It reaches, wiper motor etc., corresponding permanent-magnet ferrite dosage also rapidly increases, while automobile industry is that have height to customer experience
It is required that industry, in vehicle driving use process noise and abnormal sound have a very high requirement, magneto is used as in automobile
How realize that the indispensable components of various automatic operations, the noise that itself high speed rotation generates are inevitable in use
It effectively reduces noise the producer of permanent-magnet ferrite is come described to be the problem of can not avoiding.
Traditional solution is permanent-magnet ferrite to be designed to eccentric shape, and both interior thickness was thick, and thickness of two sides is thin, makes forever
The Surface field waveform of magnetic iron oxide working face is distributed in sinuous state, reduces commutating field between different magnetic poles, and then realize drop
The purpose made an uproar.But this scheme has obvious drawback, because after magnet steel is changed to eccentric shape, magnet steel weight saving, so that magnetic flux
Amount reduces, and the serious torsion that will cause motor is insufficient, while magnetic flux reduces, and motor rotary speed can be made to improve, motor rotary speed
Noise also synchronous raising is risen, moreover, must just improve material etc. to make up the flux loss after the design of magnet steel bias
Grade, causes the raising of manufacturing cost.
Therefore, how to overcome the above problem, realize the purpose of permanent-magnet ferrite noise reduction, and guarantee the torsion and magnetic flux of motor
Amount is current urgently to be solved.
Summary of the invention
The problems of the purpose of the present invention is overcoming existing permanent-magnet ferrite to be designed to that eccentric shape is used for noise reduction,.
Permanent-magnet ferrite production method for low noise magneto of the invention overcomes the drawback in traditional eccentric scheme, makes
The shape of permanent-magnet ferrite is not eccentric, and guarantees that magnetic flux does not decline, and can make the Surface field wave of permanent-magnet ferrite working face
Shape is distributed in sinuous state, realizes the purpose of noise reduction, is suitable for low noise magneto, and production method is reliable and practical, and design is skilful
It is wonderful, it has a good application prospect.
In order to achieve the above object, the technical scheme adopted by the invention is that:
A kind of permanent-magnet ferrite production method for low noise magneto, includes the following steps,
Strontium ferrite powder particle is processed into the coarse powder that granularity is 2~10 μm by flour mill by step (A), and by coarse powder
It is uniformly mixed；
Uniformly mixed coarse powder is added water as grinding distribution agent, and carries out ball milling by ball mill by step (B), makes coarse dust
Degree attenuates and makes water slurry, increases calcium: 0.4 ~ 1.2 part, silicon: 0.2 ~ 0.6 part, aluminium while adding water: 0. 2 ~ 1.0 parts；
Water content is dewatered to 34 ~ 38% by dewaterer, forms slurry by the water slurry after ball milling by step (C)；
Step (D), by slurry by the way that in high pressure material pouring cylinder injection moulding mold, permanent-magnet ferrite green compact are made in green compact, the permanent magnetism
The water content 11%-14% of ferrite green compact, while the fine ferrite particle in the slurry is in the outer magnetic of hydraulic press magnetizing coil
It is arranged under field action by magnetic aligning；
Step (E), by permanent-magnet ferrite green compact by roller kilns, respectively by drying and dewatering area, heating zone, maximum temperature sintering
Area, cooling area stage are fired into the ripe base of permanent-magnet ferrite；
Step (F) obtains the ferrite of customer requirement size using skive machining to the ripe base of permanent-magnet ferrite
Product.
It is previously described for the permanent-magnet ferrite production method of low noise magneto, step (A), the Strontium ferrite powder
Particle, including following components and each component, Fe2O3: 88 ~ 90 parts；SrO:10 ~ 11 part.
It is previously described for the permanent-magnet ferrite production method of low noise magneto, which is characterized in that step (B) is passed through
10~14hr of ball mill grinding, 5 0.80 ~ 1.00 μm of the powder particles after making ball milling.
It is previously described for the permanent-magnet ferrite production method of low noise magneto, slurry is passed through high pressure injection by step (D)
In material cylinder injection moulding mold, permanent-magnet ferrite green compact are made in green compact, the water content 11%-14% of the permanent-magnet ferrite green compact, together
When the slurry in fine ferrite particle under the external magnetic field of hydraulic press magnetizing coil by magnetic aligning arrange, the shaping mould
Tool can have predetermined direction row by the fine ferrite particle of aqueous slurry under the action of hydraulic press magnetic coil is orientated field
Column.
It is previously described for the permanent-magnet ferrite production method of low noise magneto, the lower mold of the molding die is non-magnetic
The shape of layer is intermediate thin, two sides thickness, wherein the interior thickness of permanent-magnet ferrite type chamber is T0, thickness of two sides T1, and T0
≤T1。
It is previously described for the permanent-magnet ferrite production method of low noise magneto, step (F) is ripe to permanent-magnet ferrite
Base obtains the ferrite product of customer requirement size using skive machining, adds using skive cutting
After work, the intermediate grinding allowance d0 of the ripe base of the permanent-magnet ferrite is between 0.3 ~ 0.7mm, two side grindings of the ripe base of the permanent-magnet ferrite
Surplus d1 is cut between 0.8 ~ 1.2mm.
The beneficial effects of the present invention are: the permanent-magnet ferrite production method for low noise magneto of the invention, gram
Drawback in the eccentric scheme of clothes tradition, the shape of the permanent-magnet ferrite made is not eccentric, and guarantees that magnetic flux does not decline, and can make forever
The Surface field waveform of magnetic ferrites working face is distributed in sinuous state, realizes the purpose of noise reduction, is suitable for low noise Permanent Magnet and Electric
Machine, production method is reliable and practical, is skillfully constructed, and has a good application prospect.
Detailed description of the invention
Fig. 1 is the schematic diagram of the non-magnetic layer structure of the non-magnetic layer of mold under conventional molding die；
Fig. 2 is the schematic diagram of the non-magnetic layer structure of the non-magnetic layer of mold under molding die of the invention；
Fig. 3 is flattening table magnetic curve-sine degree schematic diagram of conventional molding die；
Fig. 4 is flattening table magnetic curve-sine degree schematic diagram of molding die of the invention；
Fig. 5 is the schematic diagram of the ripe base grinding allowance of conventional permanent-magnet ferrite；
Fig. 6 is the schematic diagram of the ripe base grinding allowance of permanent-magnet ferrite of the invention.
Specific embodiment
Below in conjunction with Figure of description, the present invention is further illustrated.
Permanent-magnet ferrite production method for low noise magneto of the invention, includes the following steps,
Strontium ferrite powder particle is processed into the coarse powder that granularity is 2~10 μm by flour mill by step (A), and by coarse powder
It is uniformly mixed, the Strontium ferrite powder particle, including following components and each component, Fe2O3: 88 ~ 90 parts；SrO:10 ~ 11 part；
Uniformly mixed coarse powder is added water as grinding distribution agent, and carries out ball milling by ball mill by step (B), makes coarse dust
Degree, which attenuates, makes water slurry, increases calcium: 0.4 ~ 1.2 part, silicon: 0.2 ~ 0.6 part, aluminium while adding water: 0. 2 ~ 1.0 parts, passing through
10~14hr of ball mill grinding, 5 0.80 ~ 1.00 μm of the powder particles after making ball milling, wherein increased calcium sial
Water content is dewatered to 34 ~ 38% by dewaterer, forms slurry by the water slurry after ball milling by step (C)；
Step (D), by slurry by the way that in high pressure material pouring cylinder injection moulding mold, permanent-magnet ferrite green compact are made in green compact, the permanent magnetism
The water content 11%-14% of ferrite green compact, while the fine ferrite particle in the slurry is in the outer magnetic of hydraulic press magnetizing coil
It is arranged under field action by magnetic aligning, which can be by the fine ferrite particle of aqueous slurry in hydraulic press magnetic coil
It is orientated under the action of field, there is predetermined direction arrangement, the shape of the non-magnetic layer of lower mold of the molding die is intermediate thin, two sides
It is thick, wherein as shown in Figures 1 and 2, the shape of the non-magnetic layer of the lower mold of conventional forming mold is that thick middle two sides are thin
The interior thickness of (T0 > > T1), permanent-magnet ferrite type chamber are T0, thickness of two sides T1, and T0≤T1, and new molding die is being pressed
During base, the intensity of intermediate position magnetic field orientating field can be increased obviously, make the fine ferrite particle at middle part in green compact process
In have and higher density and take loudness, the intermediate position table magnetic density of final permanent-magnet ferrite can be improved, make final products work
Make face table magnetic wave shape pinnacle, and then improve the Surface field sine degree of permanent-magnet ferrite product working face, such as Fig. 3 and Fig. 4 institute
Show, respectively table magnetic curve-sine degree schematic diagram of conventional forming mold and molding die of the present invention, Fig. 3 is flattening table magnetic
Curve-sine degree, Fig. 4 are topization table magnetic curve-sine degree, it is evident that table magnetic curve-poor sine degree of Fig. 3 ratio Fig. 4；
Step (E), by permanent-magnet ferrite green compact by roller kilns, respectively by drying and dewatering area, heating zone, maximum temperature sintering
Area, cooling area stage are fired into the ripe base of permanent-magnet ferrite；
Step (F) obtains the ferrite of customer requirement size using skive machining to the ripe base of permanent-magnet ferrite
Product, using after skive machining, the intermediate grinding allowance d0 of the ripe base of the permanent-magnet ferrite 0.3 ~ 0.7mm it
Between, the two sides grinding allowance d1 of the ripe base of the permanent-magnet ferrite is between 0.8 ~ 1.2mm, as shown in Figures 5 and 6, respectively routinely
The ripe base grinding allowance schematic diagram of permanent-magnet ferrite, schematic diagram of the invention have modified in green body pressing process after the two comparison
Moisture discharge and green body compression deviate caused by predetermined particle orientation, increase position among ferrite permanent-magnet working face
Table magnetic, reduce the table magnetic of working face two sides, make working face table magnetic wave shape pinnacle, both improved the sine of table magnetic wave shape
Degree, and then achieve the purpose that reduce magneto noise.
In conclusion the permanent-magnet ferrite production method for low noise magneto of the invention, overcomes traditional bias
The shape of drawback in scheme, the permanent-magnet ferrite made is not eccentric, and guarantees that magnetic flux does not decline, and can make permanent-magnet ferrite work
The Surface field waveform for making face is distributed in sinuous state, realizes the purpose of noise reduction, is suitable for low noise magneto, production method
It is reliable and practical, it is skillfully constructed, has a good application prospect.
Basic principles and main features and advantage of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (6)
1. a kind of permanent-magnet ferrite production method for low noise magneto, it is characterised in that: include the following steps,
Strontium ferrite powder particle is processed into the coarse powder that granularity is 2~10 μm by flour mill by step (A), and by coarse powder
It is uniformly mixed；
Uniformly mixed coarse powder is added water as grinding distribution agent, and carries out ball milling by ball mill by step (B), makes coarse dust
Degree attenuates and makes water slurry, increases calcium: 0.4 ~ 1.2 part, silicon: 0.2 ~ 0.6 part, aluminium while adding water: 0. 2 ~ 1.0 parts；
Water content is dewatered to 34 ~ 38% by dewaterer, forms slurry by the water slurry after ball milling by step (C)；
Step (D), by slurry by the way that in high pressure material pouring cylinder injection moulding mold, permanent-magnet ferrite green compact are made in green compact, the permanent magnetism
The water content 11%-14% of ferrite green compact, while the fine ferrite particle in the slurry is in the outer magnetic of hydraulic press magnetizing coil
It is arranged under field action by magnetic aligning；
Step (E), by permanent-magnet ferrite green compact by roller kilns, respectively by drying and dewatering area, heating zone, maximum temperature sintering
Area, cooling area stage are fired into the ripe base of permanent-magnet ferrite；
Step (F) obtains the ferrite of customer requirement size using skive machining to the ripe base of permanent-magnet ferrite
Product.
2. the permanent-magnet ferrite production method according to claim 1 for low noise magneto, it is characterised in that: step
Suddenly (A), the Strontium ferrite powder particle, including following components and each component, Fe2O3: 88 ~ 90 parts；SrO:10 ~ 11 part.
3. the permanent-magnet ferrite production method according to claim 1 for low noise magneto, which is characterized in that step
Suddenly (B) is ground, 5 0.80 ~ 1.00 μm of the powder particles after making ball milling by 10~14hr of ball mill.
4. the permanent-magnet ferrite production method according to claim 1 for low noise magneto, it is characterised in that: step
Suddenly (D), by slurry by the way that in high pressure material pouring cylinder injection moulding mold, permanent-magnet ferrite green compact are made in green compact, the permanent-magnet ferrite
The water content 11%-14% of green compact, while the fine ferrite particle in the slurry is in the external magnetic field of hydraulic press magnetizing coil
It is arranged by magnetic aligning down, which can be orientated field in hydraulic press magnetic coil for the fine ferrite particle of aqueous slurry
Under the action of, there is predetermined direction arrangement.
5. the permanent-magnet ferrite production method according to claim 4 for low noise magneto, it is characterised in that: should
The shape of the non-magnetic layer of lower mold of molding die is intermediate thin, two sides thickness, wherein the interior thickness of permanent-magnet ferrite type chamber
For T0, thickness of two sides T1, and T0≤T1.
6. the permanent-magnet ferrite production method according to claim 1 for low noise magneto, it is characterised in that: step
Suddenly (F) obtains the ferrite product of customer requirement size using skive machining to the ripe base of permanent-magnet ferrite,
After skive machining, the intermediate grinding allowance d0 of the ripe base of the permanent-magnet ferrite is between 0.3 ~ 0.7mm, this is forever
The two sides grinding allowance d1 of the ripe base of magnetic ferrites is between 0.8 ~ 1.2mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811049657.1A CN109133898A (en) | 2018-09-10 | 2018-09-10 | A kind of permanent-magnet ferrite production method for low noise magneto |
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| CN201811049657.1A CN109133898A (en) | 2018-09-10 | 2018-09-10 | A kind of permanent-magnet ferrite production method for low noise magneto |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06295836A (en) * | 1992-06-30 | 1994-10-21 | Samsung Corning Co Ltd | Ferrite core manufacturing method |
| JP2000254907A (en) * | 1999-03-05 | 2000-09-19 | Tdk Corp | Dry molding die for arclike ferrite magnet |
| CN1450022A (en) * | 2003-04-30 | 2003-10-22 | 武汉众兴磁业技术开发有限公司 | Productive method of sintering anisotropic permanent magnetic ferrite |
| CN101011738A (en) * | 2006-02-01 | 2007-08-08 | Tdk株式会社 | Magnetic field molding device, die and method for magnetic field molding |
| CN203418629U (en) * | 2013-08-21 | 2014-02-05 | 绵阳市东辰磁性材料有限公司 | Tile-shaped die of permanent magnetic ferrite |
| CN206312752U (en) * | 2016-12-31 | 2017-07-07 | 中山尔比特磁电科技有限公司 | An ultra-thin soft ferrite core molding die |
-
2018
- 2018-09-10 CN CN201811049657.1A patent/CN109133898A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06295836A (en) * | 1992-06-30 | 1994-10-21 | Samsung Corning Co Ltd | Ferrite core manufacturing method |
| JP2000254907A (en) * | 1999-03-05 | 2000-09-19 | Tdk Corp | Dry molding die for arclike ferrite magnet |
| CN1450022A (en) * | 2003-04-30 | 2003-10-22 | 武汉众兴磁业技术开发有限公司 | Productive method of sintering anisotropic permanent magnetic ferrite |
| CN101011738A (en) * | 2006-02-01 | 2007-08-08 | Tdk株式会社 | Magnetic field molding device, die and method for magnetic field molding |
| CN203418629U (en) * | 2013-08-21 | 2014-02-05 | 绵阳市东辰磁性材料有限公司 | Tile-shaped die of permanent magnetic ferrite |
| CN206312752U (en) * | 2016-12-31 | 2017-07-07 | 中山尔比特磁电科技有限公司 | An ultra-thin soft ferrite core molding die |
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