CN113996791A - Manufacturing method of high-performance hot-pressing neodymium-iron-boron magnet ring - Google Patents
Manufacturing method of high-performance hot-pressing neodymium-iron-boron magnet ring Download PDFInfo
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- CN113996791A CN113996791A CN202111133381.7A CN202111133381A CN113996791A CN 113996791 A CN113996791 A CN 113996791A CN 202111133381 A CN202111133381 A CN 202111133381A CN 113996791 A CN113996791 A CN 113996791A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F5/106—Tube or ring forms
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
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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
- H01F41/0266—Moulding; Pressing
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Abstract
The invention belongs to the technical field of neodymium iron boron magnetic rings, and relates to a manufacturing method of a high-performance hot-pressing neodymium iron boron magnetic ring, which comprises the following steps: s1, cold pressing and pre-pressing: cold press molding the neodymium iron boron magnetic powder to obtain a cold blank; s2, hot pressing: uniformly coating the solution formed by the composite lubricant A on the surface of the cold blank, drying, and then placing the cold blank into a forming device for hot pressing treatment to obtain a hot pressed blank; s3, thermal deformation step: and uniformly coating the solution formed by the composite lubricant B on the surface of the hot-pressed blank, drying, and then placing the hot-pressed blank in forming equipment for thermal deformation treatment to obtain the radiation magnet ring. By combining the composite lubricant and the preparation process, the problem that the coating of the lubricant is cracked in the hot forming process is solved, the qualified rate of magnetic ring products is improved, abnormal growth of crystal grains is reduced, and the performance of the magnet is improved.
Description
Technical Field
The invention belongs to the technical field of neodymium iron boron magnetic rings, and relates to a manufacturing method of a high-performance hot-pressing neodymium iron boron magnetic ring.
Background
In the application of the permanent magnet motor, the radiation magnetic ring has the advantages of compact structure, simple assembly, stable output waveform and the like, the weight and the energy consumption of the motor are obviously reduced, and the operation stability is improved. For this reason, the permanent magnet components in high performance permanent magnet motors are gradually being transformed from traditional magnetic shoe splice rings to integral radiating rings. The main preparation methods of the prior radiation magnet ring, particularly the neodymium iron boron radiation magnet ring, comprise sintering and hot press forming methods. The sintering radiation magnetic ring is prepared by carrying out radiation orientation in the process of forming the permanent magnet powder and then sintering to obtain the magnetic ring with radiation orientation. The hot-press forming is to conduct a hot-press extrusion (thermal deformation) mode on the hot-press magnet in a temperature field to induce the spontaneous orientation of the crystal grains inside the hot-press magnet to form a radiation magnetic ring. Compared with a sintered magnetic ring, the hot-deformed magnetic ring has the advantages of short preparation process, high reliability and high magnetic performance, and particularly has great advantages in the aspect of preparing magnetic rings with high diameter ratio, thin walls and small sizes. However, the blank must be formed in a high temperature and high pressure environment, and the lubricant (boron nitride, molybdenum disulfide or ceramic powder) coated on the surface of the blank is insufficient in ductility, so that cracking and even partial falling are easily caused in the forming process of the blank surface, and thus, the die is also easily adhered and abraded. This is a difficult problem which puzzles the mass production and application of the product, and limits the popularization and application of the technology.
Disclosure of Invention
Aiming at the defects in the preparation process of the radiation magnet ring in the prior art, the invention provides the manufacturing method of the neodymium iron boron magnet ring, which solves the problem of coating fracture of a lubricant coating in the hot forming process by combining a composite lubricant and a preparation process, improves the qualification rate of the magnet ring product, reduces abnormal growth of crystal grains and improves the performance of a magnet.
One purpose of the invention is realized by the following technical scheme:
a manufacturing method of a high-performance hot-pressing neodymium-iron-boron magnet ring comprises the following steps:
s1, cold pressing and pre-pressing: cold press molding the neodymium iron boron magnetic powder to obtain a cold blank;
s2, hot pressing: uniformly coating the solution formed by the composite lubricant A on the surface of the cold blank, drying, and then placing the cold blank into a forming device for hot pressing treatment to obtain a hot pressed blank;
s3, thermal deformation step: and uniformly coating the solution formed by the composite lubricant B on the surface of the hot-pressed blank, drying, and then placing the hot-pressed blank in forming equipment for thermal deformation treatment to obtain the radiation magnet ring.
Preferably, the cold press molding pressure in step S1 is 200 to 600MPa, and the pressure is increased for 30 to 60 seconds.
Preferably, the density of the cold blank obtained in the step S1 is 5.3-5.7 g/cm3。
Preferably, the composite lubricant a used in step S2 is prepared from boron nitride powder and graphite powder in a mass ratio (0.9-1.2): 1, and (b) a complex formed.
Preferably, the composite lubricant B used in step S3 is prepared from boron nitride powder and graphite powder in a mass ratio (0.4 to 0.7): 1, and (b) a complex formed.
Preferably, the solution formed by the composite lubricant A and the solution formed by the composite lubricant B are formed by respectively dispersing the composite lubricant A and the composite lubricant B in an organic solvent, and the volume ratio of the mass of the composite lubricant A to the mass of the composite lubricant B to the organic solvent is 1-5 g/ml.
Preferably, after drying, the thickness of the coating of the composite lubricant A is 0.05-0.1 mm, and the thickness of the coating of the composite lubricant B is 0.03-0.08 mm.
Preferably, the pressure of the hot pressing treatment in the step S2 is 400-600 MPa, microwave heating is adopted in the hot pressing process, the heating temperature is 500-650 ℃, and the pressing time is 30-50S.
Preferably, the density of the hot-pressed compact obtained in step S2 is not less than 7.5g/cm3。
Preferably, the pressure of the thermal deformation treatment in the step S3 is 300-500 MPa, microwave heating is adopted in the thermal deformation process, the heating temperature is 600-750 ℃, the time required for heating the hot-pressed blank to 600-750 ℃ is 50-80S, and the thermal deformation time is 50-70S.
The other purpose of the invention is realized by the following technical scheme:
a high-performance hot-pressing neodymium-iron-boron magnet ring is prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the manufacturing method of the neodymium iron boron magnet ring, cold pressing and pre-pressing treatment are carried out before the hot pressing step, so that the problem of crystal grain growth is reduced, a uniform magnet with a nanocrystalline structure is obtained, and the performance of the magnet is improved;
2. in the manufacturing method of the neodymium iron boron magnetic ring, the hot pressing step and the thermal deformation step both adopt microwave heating modes, and compared with the traditional heating mode, the microwave heating mode has the advantages of high heating speed and more uniform heating, can obtain more uniform and finer crystal grain size, and is beneficial to improving the performance of a magnet;
3. in the manufacturing method of the neodymium iron boron magnet ring, the surface of the blank is coated with the composite lubricant formed by mixing the boron nitride and the graphite powder in a proper proportion before the hot pressing step and the thermal deformation step, and the composition of the boron nitride and the graphite powder can effectively solve the problem that the coating of the lubricant is broken in the hot pressing and thermal deformation processes, so that the finished product percent of pass of the neodymium iron boron magnet is improved;
4. the specific formulas of the composite lubricant coated on the blank surfaces in the hot pressing step and the thermal deformation step are different, and the composite lubricant A adopted in the hot pressing step is prepared from boron nitride powder and graphite powder in a mass ratio of (0.9-1.2): 1, and the composite lubricant B adopted in the thermal deformation step is prepared from boron nitride powder and graphite powder in a mass ratio (0.4-0.7): 1, the composite lubricant with different proportions is adopted in hot pressing and hot deformation, so that the composite lubricant has different functions, and the qualification rate and the magnetic property of a finished magnet product are effectively improved;
5. according to the manufacturing method of the neodymium iron boron magnet ring, the whole hot pressing and thermal deformation process can be completed at a higher speed, the production efficiency is improved, the cost is reduced, the problem of crystal grain growth is reduced, and the performance of a magnet is improved.
Drawings
FIG. 1 is a magnetic ring made using a composite lubricant A and a composite lubricant B of the present invention;
fig. 2 is an unqualified magnet ring prepared using conventional boron nitride powder as a lubricant.
Detailed Description
Hereinafter, embodiments will be described in detail with respect to the method of manufacturing a high-performance hot-pressed neodymium-iron-boron magnet ring of the present invention, however, these embodiments are exemplary and the present disclosure is not limited thereto. And the drawings used herein are for the purpose of illustrating the disclosure better and are not intended to limit the scope of the invention.
In some embodiments of the present invention, a method for manufacturing a high-performance hot-pressed ndfeb magnet ring includes the following steps:
s1, cold pressing and pre-pressing: cold press molding the neodymium iron boron magnetic powder to obtain a cold blank;
s2, hot pressing: uniformly coating the solution formed by the composite lubricant A on the surface of the cold blank, drying, and then placing the cold blank into a forming device for hot pressing treatment to obtain a hot pressed blank;
s3, thermal deformation step: and uniformly coating the solution formed by the composite lubricant B on the surface of the hot-pressed blank, drying, and then placing the hot-pressed blank in forming equipment for thermal deformation treatment to obtain the radiation magnet ring.
According to the manufacturing method of the neodymium iron boron magnet ring, cold pressing and pre-pressing treatment is carried out before the hot pressing step, and the neodymium iron boron magnet ring is pressurized for 30-60 s under the cold pressing pressure of 200-600 MPa to obtain the neodymium iron boron magnet ring with the density of 5.3-5.7 g/cm3The cold blank of (1). The loose packed density of the neodymium iron boron magnetic powder is 2.0-3.0 g/cm3The cold pressing and prepressing process is carried out to reach 5.3-5.7 g/cm3Because the process is not heated, the cold pressing and prepressing process does not have the phenomenon of grain growth; because a cold pressing and pre-pressing process is adopted, the loose packing density of the original neodymium iron boron magnetic powder is 2.0-3.0 g/cm in the subsequent hot pressing process3Directly heating and pressing to more than or equal to 7.5g/cm3The density of the glass fiber is changed to 5.3 to 5.7g/cm3Pressing to 7.5g/cm or more by heating3The problem that the crystal grains are easy to grow due to relatively long hot pressing time in the prior art is solved, and the uniform nanocrystalline structure magnet is easier to obtain.
In the manufacturing method of the neodymium iron boron magnetic ring, the microwave heating mode is adopted in the hot pressing step and the thermal deformation step. The microwave heating has the characteristic of high heating speed, the hot pressing treatment time and the thermal deformation treatment time are greatly reduced in a microwave heating mode, the pressing time in the hot pressing treatment is reduced to 30-50 s, the thermal deformation time in the thermal deformation treatment is reduced to 50-70 s, and the crystal grains grow unobviously due to the fact that the hot pressing time and the thermal deformation time are shortened. And because the microwave heating also has the characteristic of uniform heating, the grain size is more uniform, the spontaneous orientation of the grains induced in the thermal deformation process is more uniform, the radiation orientation of the magnetic ring is more uniform, and the improvement of the performance of the magnet is facilitated.
In the manufacturing method of the neodymium iron boron magnetic ring, the composite lubricant is coated on the surface of the blank before the hot pressing step and the thermal deformation step. The composite lubricant adopted by the invention is formed by mixing boron nitride and graphite powder in a proper proportion, the boron nitride has good heat resistance, the graphite powder has excellent ductility and low friction coefficient, and the composition of the boron nitride and the graphite powder can effectively solve the problem that the coating of the lubricant is broken in the hot pressing and thermal deformation processes, thereby improving the yield of the neodymium iron boron magnet; meanwhile, the friction coefficient of the composite lubricant is low, so that the hot forming speed can be properly improved, abnormal growth of crystal grains is reduced, and the coercive force of the magnet is improved.
And the specific formula of the composite lubricant coated on the blank surface in the hot pressing step and the hot deformation step is different. The composite lubricant A adopted in the hot pressing step is prepared from boron nitride powder and graphite powder in a mass ratio of (0.9-1.2): 1, the complex formed; the composite lubricant B adopted in the thermal deformation step of the step S3 is prepared from boron nitride powder and graphite powder in a mass ratio of (0.4-0.7): 1, and (b) a complex formed. In the hot pressing step, the composite lubricant A is adopted, so that the high temperature resistance of the cold blank is improved, and the abrasion of a die is reduced; in the thermal deformation step, the composite lubricant B is adopted to improve the lubricating property of the blank, avoid the cracking of the blank, reduce the thermal adhesion of a die, improve the thermal deformation speed, prevent the abnormal growth of nano crystals, improve the coercive force of a product and realize high performance.
Further preferably, the composite lubricant A adopted in the hot pressing step is prepared from boron nitride powder and graphite powder in a mass ratio of 1.1: 1, the complex formed; the composite lubricant B adopted in the thermal deformation step of the step S3 is prepared from boron nitride powder and graphite powder in a mass ratio of 0.47: 1, and (b) a complex formed.
The average grain diameter of the boron nitride powder in the composite lubricant A and the composite lubricant B is less than or equal to 1 μm, and the average grain diameter of the graphite powder is less than or equal to 1 μm.
Fig. 1 shows a magnet ring prepared by using the composite lubricant a and the composite lubricant B of the present invention, which has a smooth surface, and fig. 2 shows an unqualified magnet ring prepared by using the conventional boron nitride powder as a lubricant, which has a serious surface wear, and the magnet ring cannot be applied to an actual product.
Preferably, the solution formed by the composite lubricant A coated by the invention is formed by dispersing the composite lubricant A in an organic solvent, and the volume ratio of the mass of the composite lubricant A to the organic solvent is 1-5 g/ml; the solution formed by the coated composite lubricant B is formed by dispersing the composite lubricant B in an organic solvent, and the volume ratio of the mass of the composite lubricant B to the organic solvent is 1-5 g/ml. The organic solvent is exemplified by ethanol, acetone, and the like.
Preferably, after drying, the thickness of the coating of the composite lubricant A is 0.05-0.1 mm, and the thickness of the coating of the composite lubricant B is 0.03-0.08 mm.
The technical solutions of the present invention are further described and illustrated below by specific examples, it should be understood that the specific examples described herein are only for the purpose of facilitating understanding of the present invention, and are not intended to be specific limitations of the present invention. The raw materials used in the examples of the present invention are those commonly used in the art, and the methods used in the examples are those conventional in the art, unless otherwise specified.
The neodymium iron boron magnetic powder used in the following examples and comparative examples was purchased from quick quenched magnetic powder of MQ company, canada, and the alloy powder composition of the quick quenched magnetic powder was: 30 wt% of Nd, 3.5 wt% of Co, 1 wt% of B and the balance of Fe; boron nitride powder is CW-BN-001 produced by Shanghai Chaowei nanometer science and technology Limited: the graphite powder is CW-C-001 produced by Shanghai Chaowei nanometer science and technology Limited.
Example 1
The preparation method of the neodymium iron boron magnetic ring comprises the following steps:
s1, cold pressing and pre-pressing: placing neodymium iron boron magnetic powder into a forming devicePre-pressing at 200MPa for 60s to obtain cold blank with density of 5.4g/cm3；
S2, hot pressing: uniformly coating the solution formed by the composite lubricant A on the surface of a cold blank, drying, coating the solution with the thickness of 0.05mm, placing the cold blank into a forming device for hot pressing treatment, setting the pressure to be 400MPa, heating the cold blank by adopting microwave heating at the heating temperature of 550 ℃, starting pressing after heating to 550 ℃, and manufacturing a hot pressed blank with the pressing time of 50s, wherein the density of a magnet of the hot pressed blank is 7.5g/cm3；
S3, thermal deformation step: uniformly coating the solution formed by the composite lubricant B on the surface of a hot-pressed blank, drying, then coating with the thickness of 0.03mm, placing the hot-pressed blank in a forming device for thermal deformation treatment, setting the pressure to be 300MPa, heating by adopting microwave, wherein the heating temperature is 650 ℃, the time of heating the hot-pressed blank from the normal temperature to the set temperature is 60s, heating to 650 ℃, and then performing thermal deformation treatment, wherein the time is 65s, so that a radiation magnetic ring is obtained, and the inner diameter of the radiation ring is 24mm, the outer diameter of the radiation ring is 30mm, and the height of the radiation ring is 28.5 mm.
The composite lubricant A adopted in the preparation process is prepared from boron nitride powder and graphite powder in a mass ratio of 0.9: 1, and the composite lubricant B is prepared from boron nitride powder and graphite powder in a mass ratio of 0.35: 1, and (b) a complex formed. The solution formed by the composite lubricant A is a solution formed by dispersing the composite lubricant A in absolute ethyl alcohol, the volume ratio of the mass of the composite lubricant A to the absolute ethyl alcohol is 1.8g/ml, the solution formed by dispersing the composite lubricant B in the absolute ethyl alcohol is a solution formed by dispersing the composite lubricant B in the absolute ethyl alcohol, and the volume ratio of the mass of the composite lubricant B to the absolute ethyl alcohol is 2.0 g/ml.
Example 2
The difference between the embodiment 2 and the embodiment 1 is that the composite lubricant A of the embodiment 2 is prepared by mixing boron nitride powder and graphite powder in a mass ratio of 1.1: 1, and the composite lubricant B is prepared from boron nitride powder and graphite powder in a mass ratio of 0.47: 1, and (b) a complex formed. The rest is the same as in example 1.
The preparation method of the embodiment is adopted to prepare 100 radiation magnet ring products, and the qualification rate is 97%.
Example 3
Example 3 is different from example 1 in that the composite lubricant a of example 3 is prepared from boron nitride powder and graphite powder in a mass ratio of 1.2: 1, and the composite lubricant B is prepared from boron nitride powder and graphite powder in a mass ratio of 0.6: 1, and (b) a complex formed. The rest is the same as in example 1.
Example 4
The preparation method of the neodymium iron boron magnetic ring comprises the following steps:
s1, cold pressing and pre-pressing: putting the neodymium iron boron magnetic powder into a forming device for pre-pressing, setting the pressure at 400MPa, pressing for 50s, and manufacturing a cold blank, wherein the density of the cold blank is 5.5g/cm3；
S2, hot pressing: uniformly coating the solution formed by the composite lubricant A on the surface of a cold blank, drying, coating the solution with the thickness of 0.07mm, placing the cold blank into a forming device for hot pressing treatment, setting the pressure to be 500MPa, heating by adopting microwave at the heating temperature of 600 ℃, starting pressing after heating to 600 ℃, wherein the pressing time is 45s, manufacturing a hot pressed blank, and the density of a magnet of the hot pressed blank is 7.57g/cm3；
S3, thermal deformation step: uniformly coating the solution formed by the composite lubricant B on the surface of a hot-pressed blank, drying, then coating with the thickness of 0.05mm, placing the hot-pressed blank in a forming device for thermal deformation treatment, setting the pressure to be 400MPa, heating by adopting microwave, wherein the heating temperature is 700 ℃, the time of heating the hot-pressed blank from the normal temperature to the set temperature is 70s, heating to 700 ℃ and then performing thermal deformation treatment, wherein the time is 60s, and thus a radiation magnetic ring is obtained, and the inner diameter of the radiation ring is 24mm, the outer diameter of the radiation ring is 30mm, and the height of the radiation ring is 28.5 mm.
The composite lubricant A adopted in the preparation process is prepared from boron nitride powder and graphite powder in a mass ratio of 1: 1, and the composite lubricant B is prepared from boron nitride powder and graphite powder in a mass ratio of 0.45: 1, and (b) a complex formed. The solution formed by the composite lubricant A is a solution formed by dispersing the composite lubricant A in absolute ethyl alcohol, the volume ratio of the mass of the composite lubricant A to the absolute ethyl alcohol is 2.2g/ml, the solution formed by dispersing the composite lubricant B in the absolute ethyl alcohol is a solution formed by dispersing the composite lubricant B in the absolute ethyl alcohol, and the volume ratio of the mass of the composite lubricant B to the absolute ethyl alcohol is 2.5 g/ml.
The yield of 100 radiation magnetic ring products prepared by the preparation method of the embodiment is 92%.
Example 5
The preparation method of the neodymium iron boron magnetic ring comprises the following steps:
s1, cold pressing and pre-pressing: putting the neodymium iron boron magnetic powder into a forming device for pre-pressing, setting the pressure to be 500MPa, pressing for 40s, and manufacturing a cold blank, wherein the density of the cold blank is 5.6g/cm3；
S2, hot pressing: uniformly coating the solution formed by the composite lubricant A on the surface of a cold blank, drying, coating the solution with the thickness of 0.08mm, placing the cold blank into a forming device for hot pressing treatment, setting the pressure to be 600MPa, heating by adopting microwave at the heating temperature of 650 ℃, starting pressing after heating to 650 ℃, and manufacturing a hot pressed blank with the magnet density of the hot pressed blank of 7.6g/cm and the pressing time of 35s3；
S3, thermal deformation step: uniformly coating the solution formed by the composite lubricant B on the surface of a hot-pressed blank, drying, then coating with the thickness of 0.06mm, placing the hot-pressed blank in a forming device for thermal deformation treatment, setting the pressure at 500MPa, heating by adopting microwave at the heating temperature of 750 ℃, heating the hot-pressed blank from the normal temperature to the set temperature for 80s, heating to 750 ℃ and then performing thermal deformation treatment for 55s to obtain a radiation magnetic ring, wherein the inner diameter of the radiation ring is 24mm, the outer diameter of the radiation ring is 30mm, and the height of the radiation ring is 28.5 mm.
The composite lubricant A adopted in the preparation process is prepared from boron nitride powder and graphite powder in a mass ratio of 1.15: 1, and the composite lubricant B is prepared from boron nitride powder and graphite powder in a mass ratio of 0.55: 1, and (b) a complex formed. The solution formed by the composite lubricant A is a solution formed by dispersing the composite lubricant A in absolute ethyl alcohol, the volume ratio of the mass of the composite lubricant A to the absolute ethyl alcohol is 2.5g/ml, the solution formed by dispersing the composite lubricant B in the absolute ethyl alcohol is a solution formed by dispersing the composite lubricant B in the absolute ethyl alcohol, and the volume ratio of the mass of the composite lubricant B to the absolute ethyl alcohol is 3.0 g/ml.
The yield of 100 radiation magnet ring products prepared by the preparation method of the embodiment is 94%.
Comparative example 1
Comparative example 1 is different from example 2 in that the lubricant used in the S2 hot pressing step and the S3 hot deformation step of comparative example 1 is 100% boron nitride.
100 radiation magnet ring products are prepared by the preparation method of the comparative example, and the qualification rate is 82%.
Comparative example 2
Comparative example 2 is different from example 2 in that the lubricants used in the hot pressing step of S2 and the hot deformation step of S3 of comparative example 2 are 100% graphite powder.
100 radiation magnetic ring products are prepared by the preparation method of the comparative example, and the qualification rate is 79%.
Comparative example 3
Comparative example 3 is different from example 2 in that the composite lubricants used in the hot pressing step S2 and the hot deforming step S3 of comparative example 3 are boron nitride powder and graphite powder in a mass ratio of 1.1: 1, and (2) forming a complex.
100 radiation magnetic ring products are prepared by the preparation method of the comparative example, and the qualified rate is 86%.
Comparative example 4
Comparative example 3 is different from example 2 in that the composite lubricants used in the hot pressing step S2 and the hot deforming step S3 of comparative example 3 are each boron nitride powder and graphite powder at a mass ratio of 0.47: 1, and (2) forming a complex.
100 radiation magnetic ring products are prepared by the preparation method of the comparative example, and the qualification rate is 88%.
The magnetic properties of the radiation magnet rings of examples 1 to 5 and comparative examples 1 to 4 were measured, and the results are shown in table 1 below.
Table 1 magnet performance of examples 1-5 and comparative examples 1-4 radiation magnet rings
From the product yield data of the radiation magnet ring in the embodiment 2 and the comparative examples 1 to 4, the composite lubricant disclosed by the invention can be used for preparing the radiation magnet ring, so that the product yield can be greatly improved. As can be seen from the data in Table 1, the coercive force Hcj of the magnetic ring can be greatly increased by adopting the composite lubricant provided by the invention, and the magnetic energy product of the magnetic ring is improved, but the influence on the residual magnetism Br performance is small.
Finally, it should be noted that the specific examples described herein are merely illustrative of the spirit of the invention and do not limit the embodiments of the invention. Various modifications, additions and substitutions for the embodiments described herein will occur to those skilled in the art, and all such embodiments are neither required nor possible. While the invention has been described with respect to specific embodiments, it will be appreciated that various changes and modifications may be made without departing from the spirit and scope of the invention, as defined by the appended claims.
Claims (10)
1. The manufacturing method of the high-performance hot-pressing neodymium-iron-boron magnet ring is characterized by comprising the following steps of:
s1, cold pressing and pre-pressing: cold press molding the neodymium iron boron magnetic powder to obtain a cold blank;
s2, hot pressing: uniformly coating the solution formed by the composite lubricant A on the surface of the cold blank, drying, and then placing the cold blank into a forming device for hot pressing treatment to obtain a hot pressed blank;
s3, thermal deformation step: and uniformly coating the solution formed by the composite lubricant B on the surface of the hot-pressed blank, drying, and placing the hot-pressed blank in a forming device for thermal deformation treatment to obtain the radiation magnet ring.
2. The method as claimed in claim 1, wherein the cold press molding pressure of step S1 is 200-600 MPa and the pressurization is 30-60S.
3. The manufacturing method of the high-performance hot-pressing neodymium-iron-boron magnet ring as claimed in claim 1 or 2, wherein the density of the cold blank obtained in the step S1 is 5.3-5.7 g/cm3。
4. The manufacturing method of the high-performance hot-pressing neodymium-iron-boron magnet ring according to claim 1, wherein the composite lubricant A adopted in the step S2 is prepared from boron nitride powder and graphite powder in a mass ratio of (0.9-1.2): 1, and (b) a complex formed.
5. The manufacturing method of the high-performance hot-pressing neodymium-iron-boron magnet ring according to claim 1, wherein the composite lubricant B adopted in the step S3 is prepared from boron nitride powder and graphite powder in a mass ratio of (0.4-0.7): 1, and (b) a complex formed.
6. The manufacturing method of the high-performance hot-pressed neodymium-iron-boron magnet ring as claimed in claim 1, wherein the solution formed by the composite lubricant A and the solution formed by the composite lubricant B are formed by respectively dispersing the composite lubricant A and the composite lubricant B in an organic solvent, and the volume ratio of the mass of the composite lubricant A to the mass of the composite lubricant B to the organic solvent is 1-5 g/ml.
7. The method as claimed in claim 1, wherein the pressure of the hot pressing step S2 is 400-600 MPa, the heating temperature is 650 ℃ and the pressing time is 30-50S.
8. The manufacturing method of the high-performance hot-pressed NdFeB magnet ring as claimed in claim 1 or 7, wherein the density of the hot-pressed compact obtained in the step S2 is not less than 7.5g/cm3。
9. The method as claimed in claim 1, wherein the pressure of the thermal deformation process in step S3 is 300-500 MPa, the heating temperature is 600-750 ℃ by microwave heating during the thermal deformation process, the time required for heating the hot-pressed blank to 600-750 ℃ is 50-80S, and the thermal deformation time is 50-70S.
10. A high-performance hot-pressed NdFeB magnet ring is characterized in that the high-performance hot-pressed NdFeB magnet ring is prepared by the preparation method of claim 1.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111133381.7A CN113996791B (en) | 2021-09-27 | 2021-09-27 | Manufacturing method of high-performance hot-pressing neodymium-iron-boron magnetic ring |
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| CN117253688A (en) * | 2023-09-21 | 2023-12-19 | 宁波金鸡强磁股份有限公司 | High-performance hot-pressed neodymium-iron-boron magnet and preparation method and application thereof |
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