CN113996791B - Manufacturing method of high-performance hot-pressing neodymium-iron-boron magnetic ring - Google Patents
Manufacturing method of high-performance hot-pressing neodymium-iron-boron magnetic ring Download PDFInfo
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- CN113996791B CN113996791B CN202111133381.7A CN202111133381A CN113996791B CN 113996791 B CN113996791 B CN 113996791B CN 202111133381 A CN202111133381 A CN 202111133381A CN 113996791 B CN113996791 B CN 113996791B
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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
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-pressed neodymium iron boron magnetic ring, which comprises the following steps: s1, cold pressing and prepressing: cold-press molding neodymium iron boron magnetic powder to obtain a cold blank; s2, hot pressing: uniformly coating a solution formed by the composite lubricant A on the surface of the cold blank, drying, and then placing the cold blank in forming equipment for hot pressing treatment to obtain a hot pressed blank; s3, a thermal deformation step: and uniformly coating a solution formed by the composite lubricant B on the surface of the hot-pressed blank, drying, and placing the hot-pressed blank in forming equipment for thermal deformation treatment to obtain the radiation magnetic ring. By combining the composite lubricant and the preparation process, the problem that the lubricant coating breaks in the hot forming process is solved, the qualification 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-pressed 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, permanent magnet components in high performance permanent magnet motors are gradually being converted from conventional tile splice rings to integral radiating rings. At present, the main preparation methods of the radiation magnetic ring, in particular to the neodymium iron boron radiation magnetic ring, comprise sintering and hot press forming methods. The sintering radiation magnetic ring is prepared by carrying out radiation orientation in the permanent magnet powder forming process and then sintering. The hot press forming is to perform hot extrusion (thermal deformation) on the hot pressed magnet in a temperature field to induce the spontaneous orientation of the internal crystal grains to form a radiation magnetic ring. Compared with a sintered magnetic ring, the thermal deformation magnetic ring has the advantages of short preparation flow, high reliability and high magnetic performance, and particularly has great advantages in the aspects of preparing the magnetic ring with high aspect ratio, thin wall and small size. However, the blank must be formed in a high-temperature and high-pressure environment, and because the ductility of the lubricant (boron nitride, molybdenum disulfide or ceramic powder) smeared on the surface of the blank is insufficient, cracking and even partial falling are easily caused in the forming process of the surface of the blank, and the die is easy to adhere and wear. The method is a difficult problem which puzzles mass production and application of products, and limits popularization and application of the technology.
Disclosure of Invention
Aiming at the defects in the preparation process of the radiation magnetic ring in the prior art, the invention provides a manufacturing method of the neodymium iron boron magnetic ring, which solves the problem that a lubricant coating breaks in the hot forming process by combining a composite lubricant and a preparation process, improves the qualification rate of a magnetic ring product, reduces abnormal growth of crystal grains and improves the performance of a magnet.
One object of the invention is achieved by the following technical scheme:
a manufacturing method of a high-performance hot-pressed NdFeB magnetic ring comprises the following steps:
s1, cold pressing and prepressing: cold-press molding neodymium iron boron magnetic powder to obtain a cold blank;
s2, hot pressing: uniformly coating a solution formed by the composite lubricant A on the surface of the cold blank, drying, and then placing the cold blank in forming equipment for hot pressing treatment to obtain a hot pressed blank;
s3, a thermal deformation step: and uniformly coating a solution formed by the composite lubricant B on the surface of the hot-pressed blank, drying, and placing the hot-pressed blank in forming equipment for thermal deformation treatment to obtain the radiation magnetic ring.
Preferably, the cold press molding pressure in the step S1 is 200-600 MPa, and the pressure is increased for 30-60S.
Preferably, the cold blank obtained in step S1 has a density of 5.3 to 5.7g/cm 3 。
Preferably, 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.
Preferably, 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.
Preferably, the solution formed by the composite lubricant A and the solution formed by the composite lubricant B are formed by dispersing the composite lubricant A and the composite lubricant B in an organic solvent respectively, and the volume ratio of the mass of the composite lubricant A and the mass of the composite lubricant B to the volume ratio of the organic solvent is 1-5 g/ml.
Preferably, after drying, the thickness of the composite lubricant A coating is 0.05-0.1 mm, and the thickness of the composite lubricant B coating is 0.03-0.08mm.
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 the step S2 is not less than 7.5g/cm 3 。
Preferably, the heat deformation treatment in the step S3 has a pressure of 300-500 MPa, microwave heating is adopted in the heat 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 heat deformation time is 50-70S.
Another object of the invention is achieved by the following technical solutions:
the high-performance hot-pressed NdFeB magnetic ring is prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
1. in the manufacturing method of the NdFeB magnetic ring, cold pressing and prepressing treatment is carried out before the hot pressing step, so that the problem of grain growth is reduced, a uniform nanocrystalline structure magnet is obtained, and the magnet performance is improved;
2. in the manufacturing method of the NdFeB magnetic ring, the hot-pressing step and the thermal deformation step both adopt a microwave heating mode, 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 grain size, and is beneficial to improving the performance of the magnet;
3. according to the manufacturing method of the neodymium-iron-boron magnetic ring, the composite lubricant formed by mixing boron nitride and graphite powder in a proper proportion is coated on the surface of the blank before the hot-pressing step and the thermal deformation step, and the problem that a lubricant coating is broken in the hot-pressing and thermal deformation processes can be effectively solved by compounding the boron nitride and the graphite powder, so that the qualification rate of finished products of the neodymium-iron-boron magnetic ring is improved;
4. the specific formulas of the composite lubricant coated on the surfaces of the blanks 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 according to the mass ratio of (0.9-1.2): 1, wherein the composite lubricant B adopted in the thermal deformation step is a composite formed by boron nitride powder and graphite powder in a mass ratio of (0.4-0.7): 1, by adopting composite lubricants with different proportions in hot pressing and thermal deformation, the composite lubricants play different roles, and the qualification rate and the magnetic performance of finished products of the magnet are effectively improved;
5. the manufacturing method of the NdFeB magnetic ring can complete the whole hot-pressing and thermal deformation process at a high speed, improves the production efficiency, reduces the cost, reduces the problem of grain growth and improves the performance of the magnet.
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 a diagram of a reject magnet ring prepared using conventional boron nitride powder as a lubricant.
Detailed Description
Hereinafter, embodiments will be described in detail with respect to a method of manufacturing a high-performance hot-pressed neodymium iron boron magnetic ring of the present invention, however, these embodiments are exemplary, and the present disclosure is not limited thereto. And the drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure.
In some embodiments of the present invention, a method for manufacturing a high performance hot-pressed neodymium iron boron magnetic ring includes the following steps:
s1, cold pressing and prepressing: cold-press molding neodymium iron boron magnetic powder to obtain a cold blank;
s2, hot pressing: uniformly coating a solution formed by the composite lubricant A on the surface of the cold blank, drying, and then placing the cold blank in forming equipment for hot pressing treatment to obtain a hot pressed blank;
s3, a thermal deformation step: and uniformly coating a solution formed by the composite lubricant B on the surface of the hot-pressed blank, drying, and placing the hot-pressed blank in forming equipment for thermal deformation treatment to obtain the radiation magnetic ring.
In the manufacturing method of the neodymium iron boron magnetic ring, cold pressing and prepressing treatment is carried out before the hot pressing step, and the density is 5.3 to 5.7g/cm through the cold pressing pressure of 200 to 600MPa and the pressurization for 30 to 60 seconds 3 Is a cold blank of (c). The apparent density of the neodymium-iron-boron magnetic powder is 2.0-3.0 g/cm 3 The weight of the product reaches 5.3 to 5.7g/cm through cold pressing and prepressing process 3 The cold pressing and prepressing process has no grain growth phenomenon because the process is not heated; because the cold pressing pre-pressing process is adopted, the original bulk density of the neodymium iron boron magnetic powder is 2.0 to 3.0g/cm in the subsequent hot pressing process 3 Directly heating and pressing to a state of more than or equal to 7.5g/cm 3 The density is changed to be 5.3 to 5.7g/cm 3 Pressing to not less than 7.5g/cm by heating 3 The problem that the original hot pressing time is relatively long and the crystal grains are easy to grow is solved, and the uniform nanocrystalline structure magnet is easier to obtain.
In the manufacturing method of the NdFeB magnetic ring, both the hot pressing step and the thermal deformation step adopt a microwave heating mode. The microwave heating has the characteristic of high heating speed, and greatly reduces the time of hot pressing treatment and thermal deformation treatment in a microwave heating mode, wherein the pressing time in the hot pressing treatment is reduced to 30-50 s, and the thermal deformation time in the thermal deformation treatment is reduced to 50-70 s, because the hot pressing and thermal deformation time is shortened, and the grain growth is not obvious. And because 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 also more uniform, the radiation orientation of the magnetic ring is also more uniform, and the improvement of the magnet performance is facilitated.
In the manufacturing method of the NdFeB magnetic ring, composite lubricant is coated on the surface of a 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 composite of the two can effectively solve the problem that a lubricant coating breaks in the hot pressing and thermal deformation processes, thereby improving the yield of the NdFeB magnet; meanwhile, due to the low friction coefficient of the composite lubricant, 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 formulas of the composite lubricant coated on the surface of the blank in the hot pressing step and the hot deformation step are 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 composite lubricant B adopted in the thermal deformation step in the step S3 is prepared from boron nitride powder and graphite powder in a mass ratio of (0.4-0.7): 1. In the hot pressing step, a composite lubricant A is adopted, so that the high temperature resistance of cold blanks is improved, and the abrasion of dies is reduced; in the thermal deformation step, the composite lubricant B is adopted to improve the lubricity of the blank, avoid blank cracking, reduce the hot adhesion of a die, improve the thermal deformation speed, prevent the abnormal growth of nano crystals, improve the coercive force of the 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 composite lubricant B adopted in the thermal deformation step in the step S3 is prepared from boron nitride powder and graphite powder according to the mass ratio of 0.47: 1.
The average grain size of the boron nitride powder in the composite lubricant A and the composite lubricant B is less than or equal to 1 mu m, and the average grain size of the graphite powder is less than or equal to 1 mu m.
Fig. 1 is a magnetic ring prepared by using the composite lubricant a and the composite lubricant B according to the present invention, which has a smooth surface, and fig. 2 is a defective magnetic ring prepared by using conventional boron nitride powder as a lubricant, which has a serious surface abrasion, and which cannot be applied to practical products.
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, wherein 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, etc.
Preferably, after drying, the thickness of the composite lubricant A coating is 0.05-0.1 mm, and the thickness of the composite lubricant B coating is 0.03-0.08mm.
The technical scheme of the present invention will be further described by the following specific examples, and it should be understood that the specific examples described herein are only for aiding in understanding the present invention, and are not intended to be limiting. Unless otherwise indicated, all materials used in the examples of the present invention are those commonly used in the art, and all methods used in the examples are those commonly used in the art.
The neodymium iron boron magnetic powder used in the following examples and comparative examples was purchased from MQ corporation of canada as an alloy powder composition: 30wt% of Nd, 3.5wt% of Co, 1wt% of B and the balance of Fe; the boron nitride powder is CW-BN-001 produced by Shanghai super Wei nanotechnology Co., ltd.: the graphite powder is CW-C-001 produced by Shanghai super Wei nanotechnology Co.
Example 1
The preparation method of the NdFeB magnetic ring in the embodiment comprises the following steps:
s1, cold pressing and prepressing: pre-pressing neodymium iron boron magnetic powder in forming equipment under 200MPa for 60s to obtain cold blank with density of 5.4g/cm 3 ；
S2, hot pressing: uniformly coating a solution formed by the composite lubricant A on the surface of a cold blank, drying, coating the cold blank to a thickness of 0.05mm, placing the cold blank in forming equipment for hot pressing treatment, setting the pressure to 400MPa, heating by microwaves at 550 ℃, starting pressing after heating to 550 ℃, and preparing a hot pressed blank with a magnet density of 7.5g/cm for 50s 3 ；
S3, a thermal deformation step: uniformly coating a solution formed by the composite lubricant B on the surface of a hot pressed blank, drying, coating the hot pressed blank with the thickness of 0.03mm, placing the hot pressed blank in forming equipment for thermal deformation treatment, setting the pressure to 300MPa, heating by microwaves at 650 ℃, heating the hot pressed blank to the set temperature for 60s from normal temperature, heating to the 650 ℃, and performing thermal deformation treatment for 65s to obtain a radiation magnetic ring with the inner diameter of 24mm, the outer diameter of 30mm and the height of 28.5mm.
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, wherein the composite lubricant B is a composite formed by boron nitride powder and graphite powder according to the mass ratio of 0.35: 1. 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 the composite lubricant B is a solution formed by dispersing the composite lubricant B in absolute ethyl alcohol, and the volume ratio of the mass of the composite lubricant B to the absolute ethyl alcohol is 2.0g/ml.
Example 2
Example 2 differs from example 1 in that the composite lubricant a of example 2 is composed of boron nitride powder and graphite powder in a mass ratio of 1.1:1, wherein the composite lubricant B is a composite formed by boron nitride powder and graphite powder according to the mass ratio of 0.47: 1. The other steps are the same as in example 1.
100 radiation magnetic ring products are prepared by adopting the preparation method of the embodiment, and the qualification rate is 97%.
Example 3
Example 3 differs from example 1 in that the composite lubricant a of example 3 is composed of boron nitride powder and graphite powder in a mass ratio of 1.2:1, wherein the composite lubricant B is a composite formed by boron nitride powder and graphite powder according to the mass ratio of 0.6: 1. The other steps are the same as in example 1.
Example 4
The preparation method of the NdFeB magnetic ring in the embodiment comprises the following steps:
s1, cold pressing and prepressing: the neodymium iron boron magnetic powder is put into forming equipment for pre-pressing, the pressure is set to 400MPa, the pressure is increased for 50s, and a cold blank is manufactured, and the density of the cold blank is 5.5g/cm 3 ；
S2, hot pressing: uniformly coating a solution formed by the composite lubricant A on the surface of a cold blank, drying, coating the cold blank to a thickness of 0.07mm, placing the cold blank in forming equipment for hot pressing, setting the pressure to 500MPa, heating by microwaves at 600 ℃, starting pressing after heating to 600 ℃, and preparing a hot pressed blank with a magnet density of 7.57g/cm for 45s 3 ；
S3, a thermal deformation step: uniformly coating a solution formed by the composite lubricant B on the surface of a hot pressed blank, drying, coating the hot pressed blank with the thickness of 0.05mm, placing the hot pressed blank in forming equipment for thermal deformation treatment, setting the pressure to 400MPa, heating the hot pressed blank by microwaves at the temperature of 700 ℃ for 70s from normal temperature, heating the hot pressed blank to the temperature of 700 ℃ for 60s for thermal deformation treatment, and obtaining a radiation magnetic ring with the inner diameter of 24mm, the outer diameter of 30mm and the height of 28.5mm.
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, wherein the composite lubricant B is a composite formed by boron nitride powder and graphite powder according to the mass ratio of 0.45: 1. 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 the composite lubricant B is a solution formed by dispersing the composite lubricant B in absolute ethyl alcohol, and the volume ratio of the mass of the composite lubricant B to the absolute ethyl alcohol is 2.5g/ml.
100 radiation magnetic ring products are prepared by adopting the preparation method of the embodiment, and the qualification rate is 92%.
Example 5
The preparation method of the NdFeB magnetic ring in the embodiment comprises the following steps:
s1, cold pressing and prepressing: pre-pressing neodymium iron boron magnetic powder in forming equipment under 500MPa for 40s to obtain cold blank with density of 5.6g/cm 3 ；
S2, hot pressing: uniformly coating a solution formed by the composite lubricant A on the surface of a cold blank, drying, coating the cold blank to a thickness of 0.08mm, placing the cold blank in forming equipment for hot pressing, setting the pressure to 600MPa, heating by microwaves at 650 ℃, starting pressing after heating to 650 ℃, and preparing a hot pressed blank with a magnet density of 7.6g/cm for 35s 3 ；
S3, a thermal deformation step: uniformly coating a solution formed by the composite lubricant B on the surface of a hot pressed blank, drying, coating the hot pressed blank with the thickness of 0.06mm, placing the hot pressed blank in forming equipment for thermal deformation treatment, setting the pressure to 500MPa, heating the hot pressed blank by microwaves at the temperature of 750 ℃ for 80s from normal temperature, heating the hot pressed blank to the temperature of 750 ℃ for 55s for thermal deformation treatment to obtain a radiation magnetic ring with the inner diameter of 24mm, the outer diameter of 30mm and the height of 28.5mm.
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, wherein the composite lubricant B is a composite formed by boron nitride powder and graphite powder according to the mass ratio of 0.55: 1. 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 the composite lubricant B is a solution formed by dispersing the composite lubricant B in absolute ethyl alcohol, and the volume ratio of the mass of the composite lubricant B to the absolute ethyl alcohol is 3.0g/ml.
100 radiation magnetic ring products are prepared by adopting the preparation method of the embodiment, and the qualification rate is 94%.
Comparative example 1
Comparative example 1 differs from example 2 in that the lubricant used for the S2 hot pressing step and the S3 hot deformation step of comparative example 1 was 100% boron nitride.
100 radiation magnetic ring products are prepared by adopting 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 lubricant used for the S2 hot pressing step and the S3 hot deformation step of comparative example 2 is 100% graphite powder.
100 radiation magnetic ring products are prepared by adopting 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 lubricant used in the S2 hot pressing step and the S3 hot deformation step of comparative example 3 is composed of boron nitride powder and graphite powder in a mass ratio of 1.1:1, and a composite formed by the method.
100 radiation magnetic ring products are prepared by adopting the preparation method of the comparative example, and the qualification rate is 86%.
Comparative example 4
Comparative example 3 is different from example 2 in that the composite lubricant used in the S2 hot pressing step and the S3 hot deformation step of comparative example 3 is composed of boron nitride powder and graphite powder in a mass ratio of 0.47:1, and a composite formed by the method.
100 radiation magnetic ring products are prepared by adopting the preparation method of the comparative example, and the qualification rate is 88%.
The magnet properties of the radiant magnet rings of examples 1-5 and comparative examples 1-4 were measured and the results are shown in Table 1 below.
Table 1 magnet properties of examples 1-5 and comparative examples 1-4 radiation magnet rings
From the product qualification rate data of the radiation magnetic ring in the embodiment 2 and the comparative examples 1-4, the compound lubricant is adopted to prepare the radiation magnetic ring, so that the product qualification rate can be greatly improved. From the data in table 1, the compound lubricant can greatly increase the coercive force Hcj of the magnetic ring and improve the magnetic energy product of the magnetic ring, but has little influence on the performance of remanence Br.
Finally, it should be noted that the specific embodiments described herein are merely illustrative of the spirit of the invention and are not limiting of the invention's embodiments. Those skilled in the art to which the invention pertains may make various modifications or additions to the described embodiments or may be substituted in a similar manner, without and without all of the embodiments herein being fully understood. While these obvious variations and modifications, which come within the spirit of the invention, are within the scope of the invention, they are to be construed as being without departing from the spirit of the invention.
Claims (8)
1. The manufacturing method of the high-performance hot-pressed NdFeB magnetic ring is characterized by comprising the following steps of:
s1, cold pressing and prepressing: cold-press molding neodymium iron boron magnetic powder to obtain a cold blank;
s2, hot pressing: uniformly coating a solution formed by the composite lubricant A on the surface of the cold blank, drying, and then placing the cold blank in forming equipment for hot pressing treatment to obtain a hot pressed blank;
s3, a thermal deformation step: uniformly coating a solution formed by the composite lubricant B on the surface of the hot-pressed blank, drying, and placing the hot-pressed blank in forming equipment for thermal deformation treatment to obtain a radiation magnetic ring;
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;
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.
2. The method of manufacturing a high-performance hot-pressed neodymium-iron-boron magnetic ring according to claim 1, wherein the cold press molding pressure in the step S1 is 200-600 MPa, and the pressure is 30-60S.
3. The method for manufacturing a high-performance hot-pressed neodymium iron boron magnetic ring according to claim 1 or 2, wherein the density of the cold blank obtained in the step S1 is 5.3-5.7 g/cm 3 。
4. The manufacturing method of the high-performance hot-pressed neodymium iron boron magnetic ring according to claim 1, wherein the solution formed by the composite lubricant A and the solution formed by the composite lubricant B are formed by dispersing the composite lubricant A and the composite lubricant B in an organic solvent respectively, and the volume ratio of the mass of the composite lubricant A and the mass of the composite lubricant B to the volume ratio of the mass of the organic solvent are 1-5 g/ml.
5. The method for manufacturing the high-performance hot-pressed neodymium iron boron magnetic ring according to claim 1, wherein the hot pressing treatment pressure 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.
6. The method for manufacturing a high-performance hot-pressed NdFeB magnet ring according to claim 1 or 5, wherein the density of the hot pressed compact obtained in the step S2 is not less than 7.5g/cm 3 。
7. The method of manufacturing a high-performance hot-pressed neodymium iron boron magnetic ring according to claim 1, wherein the pressure of the heat deformation treatment in the step S3 is 300-500 mpa, microwave heating is adopted in the heat 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 heat deformation time is 50-70S.
8. The high-performance hot-pressed NdFeB magnetic ring is characterized by being prepared by the preparation method of claim 1.
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|---|---|---|---|---|
| US4096076A (en) * | 1976-01-29 | 1978-06-20 | Trw Inc. | Forging compound |
| JPH03241705A (en) * | 1989-11-14 | 1991-10-28 | Hitachi Metals Ltd | Magnetically anisotropic magnet and manufacture thereof |
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| CN102412043B (en) * | 2011-07-28 | 2015-07-08 | 横店集团东磁股份有限公司 | Manufacturing method of anisotropic NdFeB radial orientation magnet ring |
| CN104051104B (en) * | 2014-06-06 | 2017-06-23 | 中国科学院宁波材料技术与工程研究所 | Nd-Fe-B permanent magnetic magnet and preparation method thereof |
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| CN108346508B (en) * | 2017-01-23 | 2021-07-06 | 中国科学院宁波材料技术与工程研究所 | Preparation method for enhancing texturing of nanocrystalline complex-phase neodymium-iron-boron permanent magnet |
| CN111261398B (en) * | 2020-03-16 | 2021-07-30 | 宁波锐科磁业有限公司 | Hot pressing device, hot pressing system and preparation method for preparing neodymium iron boron magnetic ring |
| CN111403166B (en) * | 2020-04-17 | 2022-08-05 | 成都银河磁体股份有限公司 | Preparation method of hot-pressed magnet and product thereof |
| CN113035558A (en) * | 2021-03-12 | 2021-06-25 | 清华大学 | Thermal deformation neodymium iron boron magnet and preparation method thereof |
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