CN111740556A - Manufacturing method of radial orientation permanent magnetic ferrite magnetic rotor - Google Patents
Manufacturing method of radial orientation permanent magnetic ferrite magnetic rotor Download PDFInfo
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- CN111740556A CN111740556A CN202010744340.0A CN202010744340A CN111740556A CN 111740556 A CN111740556 A CN 111740556A CN 202010744340 A CN202010744340 A CN 202010744340A CN 111740556 A CN111740556 A CN 111740556A
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- rotor
- manufacturing
- raw materials
- permanent magnetic
- magnetic ferrite
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
- H01F41/0253—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 for manufacturing permanent magnets
Abstract
The invention discloses a method for manufacturing a radial orientation permanent magnetic ferrite magnetic rotor, which comprises the following steps: step one, weighing raw materials; step two, mixing the raw materials; step three, refining and blending; step four, crushing and ball milling; step five, molding and sintering, and step two, assembling the rotor; in the first step, the weight percentage of Fe is203：80‑88％、SrC03：6‑12％、CaCo3：2‑4％、Si02: 0.3-1.0%, modifier: 3-6%, plasticizer: 0.3-0.5%, additive: 0.1-0.6%, selecting raw materials; the preparation method adds a proper amount of Si0 into the raw materials for producing the permanent magnetic ferrite2The magnetism of the permanent magnetic ferrite is improved, Si02The function of refining crystal grains is achieved, and the problem of magnetic weakening is well solved; standardizing the manufacturing process of the rotor, wherein the raw materials are fully crushed, thereby ensuring the original qualityThe material granularity and the even of mixing realize that the later stage shaping is compacter, cooperate abundant sintering treatment, have guaranteed the bearing strength and the wearability of rotor magnetic shoe.
Description
Technical Field
The invention relates to the field of magnet rotors, in particular to a method for manufacturing a radial orientation permanent magnetic ferrite magnet rotor.
Background
With the development of the manufacturing technology and the control technology of the permanent magnet motor, especially the high-power permanent magnet motor, has gradually replaced the asynchronous motor and is widely applied to various industrial fields; the rotor is used as a main component of the permanent magnet motor, and the reasonability of the structural design, the simplicity of the process and the like have important influence on the manufacturing, the stable operation and the like of the motor; the radial orientation permanent magnet on the existing market is widely used on the rotor;
the radial orientation permanent magnet is one category of permanent magnets, and the radial orientation permanent magnet enters the market about twenty years later than a common axial permanent magnet; with the development of household appliance industry and information industry, a permanent magnet synchronous motor and a direct current brushless motor are widely applied, and the application of a radial orientation permanent magnet is more and more extensive, and the rotor is formed by combining a radial orientation permanent magnetic ferrite, a rotor iron core and a rotating shaft;
the existing permanent magnetic ferrite has insufficient magnetic performance, the problem of rotor magnetic degradation can occur in the long-term use process, the traditional rotor manufacturing method has the defects that the one-step forming of the rotor magnetic shoe cannot be realized, and the rotor magnetic shoe does not have good pressure-bearing strength and wear resistance, so that the design of the manufacturing method of the radial orientation permanent magnetic ferrite magnetic rotor is significant.
Disclosure of Invention
The invention aims to provide a method for manufacturing a radial orientation permanent magnetic ferrite magnetic rotor, which solves the problems in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: a method for manufacturing a radial orientation permanent magnetic ferrite magnetic rotor comprises the following steps: step one, weighing raw materials; step two, mixing the raw materials; step three, refining and blending; step four, crushing and ball milling; step five, molding and sintering, and step two, assembling the rotor;
in the first step, the weight percentage of Fe is203：80-88％、SrC03：6-12％、CaCo3：2-4％、Si02: 0.3-1.0%, modifier: 3-6%, plasticizer: 0.3-0.5%, additive: 0.1-0.6%, selecting raw materials;
in the second step, the raw materials weighed in the first step are primarily stirred and mixed by a crusher;
in the third step, the mixture obtained in the second step is put into an internal mixer for internal mixing, and the mixture after internal mixing is put into an open mill for open mixing and blending after treatment;
in the fourth step, the blend obtained in the third step is crushed and ball-milled by a wet ball mill, the granularity of the ground material is 0.8-0.9 μm, and the water content of the slurry is controlled at 28-32%;
in the fifth step, the slurry obtained in the fourth step is extruded and molded through an extrusion molding machine, and a rotor magnetic shoe blank with a required specification structure is obtained through a molding neck mold; sintering the blank by adopting an electric kiln, wherein the sintering temperature is 1000 +/-20 ℃, the sintering time is 18h, taking out the sintered blank, cooling the sintered blank to 300 ℃, placing the sintered blank in water, cooling and shaping the blank, and magnetizing the cooled blank to obtain a rotor magnetic tile;
and in the sixth step, selecting the iron cores and the rotating shafts of the rotors with the same model and the rotor magnetic shoes obtained in the fifth step, punching and assembling the magnetic shoe units into the clamping grooves on the circumference of the iron cores, and sleeving the rotating shafts into the iron cores to complete the manufacture of the integral rotors.
Preferably, the modifier in the first step is chlorinated polyethylene, and the plasticizer is calcium stearate.
Preferably, the additives in the first step are ultraviolet absorbent and polytetrafluoroethylene.
Preferably, in the third banburying step: banburying at 90-100 deg.C, wind pressure of 0.4-0.5Mpa and water pressure of 0.2-0.4 Mpa for 10-20 min.
Preferably, in the third open mill process: the temperature of a front roller in the open mill is 45-55 ℃, the temperature of the front roller is 55-65 ℃, the speed ratio is 1-1.5, and the open mill is 10-15 min.
Preferably, the green density of the rotor magnetic tile blank in the fifth step is 2.8-3.8 g/cm2。
Preferably, after the finished rotor magnetic shoe is obtained in the fifth step, the burrs on the outer wall of the end face of the magnetic shoe are ground and polished by a grinding machine.
Preferably, in the fifth step and the sixth step, the rotor magnetic shoe and the rotor are detected, the unqualified product is reworked and scrapped, and the qualified rotor is packaged and stored.
Compared with the prior art, the invention has the beneficial effects that:
(1) adding a proper amount of Si0 into the raw materials for producing the permanent magnetic ferrite2The magnetism of the permanent magnetic ferrite is improved, Si02The function of refining crystal grains is achieved, and the problem of magnetic weakening is well solved;
(2) the manufacturing process of the rotor is standardized, wherein the raw materials are fully crushed, the granularity and the uniform mixing of the raw materials are ensured, the later-stage forming is more compact, the bearing strength and the wear resistance of the rotor magnetic shoe are ensured by matching with full sintering treatment, the surface smoothness of the rotor magnetic shoe can be ensured, the tolerance consistency is good, and the later-stage assembly is facilitated;
(3) the manufacturing method can realize one-step molding of the rotor magnetic shoe, is beneficial to batch assembly of the rotor in the later period, improves the production efficiency of the rotor and improves the quality of the rotor.
Drawings
FIG. 1 is a flow chart of the manufacturing method of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, an embodiment of the present invention: a method for manufacturing a radial orientation permanent magnetic ferrite magnetic rotor comprises the following steps: step one, weighing raw materials; step two, mixing the raw materials; step three, refining and blending; step four, crushing and ball milling; step five, molding and sintering, and step two, assembling the rotor;
in the first step, the weight percentage of Fe is203：80-88％、SrC03：6-12％、CaCo3：2-4％、Si02: 0.3-1.0%, modifier: 3-6%, plasticizer: 0.3-0.5%, additive: 0.1-0.6%, selecting raw materials;
in the second step, the raw materials weighed in the first step are primarily stirred and mixed by a crusher;
in the third step, the mixture obtained in the second step is put into an internal mixer for internal mixing, and the mixture after internal mixing is put into an open mill for open mixing and blending after treatment;
in the fourth step, the blend obtained in the third step is crushed and ball-milled by a wet ball mill, the granularity after grinding is 0.8-0.9 μm, and the water content of the slurry is controlled at 28-32%;
in the fifth step, the slurry obtained in the fourth step is extruded and molded through an extrusion molding machine, and a rotor magnetic shoe blank with a structure required by specification is obtained through a molding neck mold; sintering the blank by adopting an electric kiln, wherein the sintering temperature is 1000 +/-20 ℃, the sintering time is 18h, taking out the sintered blank, cooling the sintered blank to 300 ℃, placing the sintered blank in water, cooling and shaping the blank, and magnetizing the cooled blank to obtain a rotor magnetic tile;
and in the sixth step, selecting the iron cores and the rotating shafts of the rotors with the same model and the rotor magnetic shoes obtained in the fifth step, punching and assembling the magnetic shoe units into the clamping grooves on the circumference of the iron cores, and sleeving the rotating shafts into the iron cores to complete the manufacture of the integral rotors.
Wherein, the modifier in the step one is chlorinated polyethylene, and the plasticizer is calcium stearate.
Wherein, the additive in the first step comprises an ultraviolet absorbent and polytetrafluoroethylene.
Wherein, in the third banburying process: banburying at 90-100 deg.C, wind pressure of 0.4-0.5Mpa and water pressure of 0.2-0.4 Mpa for 10-20 min.
Wherein, in the third open milling process: the temperature of a front roller in the open mill is 45-55 ℃, the temperature of the front roller is 55-65 ℃, the speed ratio is 1-1.5, and the open mill is 10-15 min.
Specifically, in the fifth step, the green density of the rotor magnetic tile blank is 2.8-3.8 g/cm2。
And concretely, after the finished rotor magnetic shoe is obtained in the step five, grinding and polishing treatment is carried out on burrs on the outer wall of the end face of the magnetic shoe through a grinding machine.
Specifically, in the fifth step and the sixth step, the rotor magnetic shoe and the rotor are detected, the unqualified product is reworked and scrapped, and the qualified rotor is packaged and stored.
Compared with the related art, the manufacturing method of the radial orientation permanent magnetic ferrite magnetic rotor provided by the invention has the following beneficial effects: wherein, a proper amount of Si02 is added into the raw materials for producing the permanent magnetic ferrite, which improves the magnetism of the permanent magnetic ferrite, Si02The invention has the advantages that the effect of refining crystal grains is achieved, the problem of magnetic weakening is well solved, the manufacturing process of the rotor is standardized, raw materials are fully crushed, the granularity and the uniformity of the raw materials are guaranteed, the later-stage forming is more compact, the bearing strength and the wear resistance of the rotor magnetic shoe are guaranteed by matching with full sintering treatment, the surface of the rotor magnetic shoe can be guaranteed to be smooth, the tolerance consistency is good, and the later-stage assembly is facilitated; the manufacturing method can realize one-step molding of the rotor magnetic shoe, is beneficial to batch assembly of the rotor in the later period, improves the production efficiency of the rotor and improves the quality of the rotor.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (8)
1. A method for manufacturing a radial orientation permanent magnetic ferrite magnetic rotor comprises the following steps: step one, weighing raw materials; step two, mixing the raw materials; step three, refining and blending; step four, crushing and ball milling; step five, molding and sintering, and step two, assembling the rotor; the method is characterized in that:
in the first step, the weight percentage of Fe is203：80-88％、SrC03：6-12％、CaCo3：2-4％、Si02: 0.3-1.0%, modifier: 3-6%, plasticizer: 0.3-0.5%, additive: 0.1-0.6%, selecting raw materials;
in the second step, the raw materials weighed in the first step are primarily stirred and mixed by a crusher;
in the third step, the mixture obtained in the second step is put into an internal mixer for internal mixing, and the mixture after internal mixing is put into an open mill for open mixing and blending after treatment;
in the fourth step, the blend obtained in the third step is crushed and ball-milled by a wet ball mill, the granularity of the ground material is 0.8-0.9 μm, and the water content of the slurry is controlled at 28-32%;
in the fifth step, the slurry obtained in the fourth step is extruded and molded through an extrusion molding machine, and a rotor magnetic shoe blank with a required specification structure is obtained through a molding neck mold; sintering the blank by adopting an electric kiln, wherein the sintering temperature is 1000 +/-20 ℃, the sintering time is 18h, taking out the sintered blank, cooling the sintered blank to 300 ℃, placing the sintered blank in water, cooling and shaping the blank, and magnetizing the cooled blank to obtain a rotor magnetic tile;
and in the sixth step, selecting the iron cores and the rotating shafts of the rotors with the same model and the rotor magnetic shoes obtained in the fifth step, punching and assembling the magnetic shoe units into the clamping grooves on the circumference of the iron cores, and sleeving the rotating shafts into the iron cores to complete the manufacture of the integral rotors.
2. The method for manufacturing a radially oriented permanent magnetic ferrite rotor according to claim 1, wherein: the modifier in the step one is chlorinated polyethylene, and the plasticizer is calcium stearate.
3. The method for manufacturing a radially oriented permanent magnetic ferrite rotor according to claim 1, wherein: the additive in the first step comprises an ultraviolet absorbent and polytetrafluoroethylene.
4. The method for manufacturing a radially oriented permanent magnetic ferrite rotor according to claim 1, wherein: in the third banburying step: banburying at 90-100 deg.C, wind pressure of 0.4-0.5Mpa and water pressure of 0.2-0.4 Mpa for 10-20 min.
5. The method for manufacturing a radially oriented permanent magnetic ferrite rotor according to claim 1, wherein: in the third open mill process: the temperature of a front roller in the open mill is 45-55 ℃, the temperature of the front roller is 55-65 ℃, the speed ratio is 1-1.5, and the open mill is 10-15 min.
6. The method for manufacturing a radially oriented permanent magnetic ferrite rotor according to claim 1, wherein: in the fifth step, the green density of the rotor magnetic tile blank is 2.8-3.8 g/cm2。
7. The method for manufacturing a radially oriented permanent magnetic ferrite rotor according to claim 1, wherein: and fifthly, after the finished rotor magnetic shoe is obtained, grinding and polishing the burrs on the outer wall of the end face of the magnetic shoe through a grinding machine.
8. The method for manufacturing a radially oriented permanent magnetic ferrite rotor according to claim 1, wherein: and in the fifth step and the sixth step, the rotor magnetic shoe and the rotor are detected, the unqualified product is reworked and scrapped, and the qualified rotor is packaged and stored.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010744340.0A CN111740556A (en) | 2020-07-29 | 2020-07-29 | Manufacturing method of radial orientation permanent magnetic ferrite magnetic rotor |
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| CN202010744340.0A CN111740556A (en) | 2020-07-29 | 2020-07-29 | Manufacturing method of radial orientation permanent magnetic ferrite magnetic rotor |
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Citations (7)
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|---|---|---|---|---|
| US3002930A (en) * | 1956-12-03 | 1961-10-03 | Philips Corp | Process of making a ferromagnetic body |
| CN101202486A (en) * | 2007-09-30 | 2008-06-18 | 许正民 | Method for making radial direction orientation permanent ferrite rotor |
| CN102424583A (en) * | 2011-09-05 | 2012-04-25 | 吕佳佳 | Magnetic powder for bonding hard ferrite |
| CN104217833A (en) * | 2014-07-07 | 2014-12-17 | 东莞市美厚塑磁有限公司 | Aging-resistant and corrosion-resistant bonded permanent magnetic ferrite material and preparation method thereof |
| US20170187258A1 (en) * | 2014-06-02 | 2017-06-29 | Nitto Denko Corporation | Permanent magnet, permanent magnet manufacturing method, rotating electric machine, and rotating electric machine manufacturing method |
| CN109354488A (en) * | 2018-10-30 | 2019-02-19 | 湖南航天磁电有限责任公司 | A kind of low cost permanent-magnet ferrite material and preparation method thereof |
| CN110114844A (en) * | 2016-12-22 | 2019-08-09 | Tdk株式会社 | Ferrite sintered magnet, ferrite particle, binding magnet, motor and generator |
-
2020
- 2020-07-29 CN CN202010744340.0A patent/CN111740556A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3002930A (en) * | 1956-12-03 | 1961-10-03 | Philips Corp | Process of making a ferromagnetic body |
| CN101202486A (en) * | 2007-09-30 | 2008-06-18 | 许正民 | Method for making radial direction orientation permanent ferrite rotor |
| CN102424583A (en) * | 2011-09-05 | 2012-04-25 | 吕佳佳 | Magnetic powder for bonding hard ferrite |
| US20170187258A1 (en) * | 2014-06-02 | 2017-06-29 | Nitto Denko Corporation | Permanent magnet, permanent magnet manufacturing method, rotating electric machine, and rotating electric machine manufacturing method |
| CN104217833A (en) * | 2014-07-07 | 2014-12-17 | 东莞市美厚塑磁有限公司 | Aging-resistant and corrosion-resistant bonded permanent magnetic ferrite material and preparation method thereof |
| CN110114844A (en) * | 2016-12-22 | 2019-08-09 | Tdk株式会社 | Ferrite sintered magnet, ferrite particle, binding magnet, motor and generator |
| CN109354488A (en) * | 2018-10-30 | 2019-02-19 | 湖南航天磁电有限责任公司 | A kind of low cost permanent-magnet ferrite material and preparation method thereof |
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Application publication date: 20201002 |