JPH0831677A - Manufacture of magnetic anisotropy resin bonding type magnet and magnetic anisotropy resin type magnet - Google Patents

Abstract

PURPOSE:To enhance the orientation of a magnetic field, compactness and productivity by orienting the powder of a magnet by applying a magnetic field to one which is liquefied by melting the powder of a thermosetting resin by heating and successively performing the compression molding thereof by applying pressure thereto. CONSTITUTION:A raw powder in which the power of a magnet having magnetic anisotropy is mixed with the powder of a thermosetting resin is supplied to a mold for molding, the temperature of which is increased and maintained by a heating device 11. The application of a magnetic field is started by an electromagnet from the point of time when the powder of the thermosetting resin is melted and liquefied and the viscosity coefficient of the resin is lowered. Next, after the heating period of time when the lowest viscosity coefficient is obtained by heating, the application of pressure is started from the pressure direction 14, 14. The application of a magnetic field and the molding under pressure are simultaneously performed while maintaining the heating temperature. When the bridging reaction of the liquefied resin proceeds and the viscosity coefficient is increased, the application of a magnetic field by means of an electromagnet 12 is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression molding method for resin-bonded magnets having excellent magnetic properties by densification and orientation by using magnet powder having magnetic anisotropy, and the compression molding. The present invention relates to a resin-bonded magnet obtained by the method.

[0002]

2. Description of the Related Art Resin-bonded magnets are inferior in magnetic properties to sintered magnets of the same type because they are manufactured by bonding magnet powder to an organic resin or a metal resin. However, because of its excellent physical properties, it is easy to handle and has a high degree of freedom in shape, and due to the development of magnetic powder with excellent magnetic anisotropy, its range of application is rapid. Has spread to. There are an injection molding method, an extrusion molding method, and a compression molding method as a molding method of the resin-bonded magnet. Although the injection molding method can perform integral molding and has excellent dimensional accuracy and shape flexibility, the resin powder type magnet with high magnetic performance can be obtained by keeping the amount of magnet powder to 60 to 65 vol% to improve productivity. I can't.
The extrusion molding method has a feature that the amount of magnet powder is 70 to 75 vol%, which is larger than that of the injection molding method, has excellent magnetic properties and can be continuously manufactured. On the other hand, compared with the injection molding method and the extrusion molding method, the compression molding method has a feature that the magnetic properties can be improved by maximizing the amount of the magnet powder to 80 to 90 vol%, although the shape freedom is small. ing.

Further, in recent years, magnet powders having magnetic anisotropy, which have been actively developed, have excellent magnetic characteristics as compared with conventional isotropic magnet powders, so that they are used as resin-bonded magnets. Is expected to be used.

Next, the following disclosures have been made regarding the technology relating to high density and high orientation in the recent compression molding method. (1) According to Japanese Patent Application Laid-Open No. 1-205403, the magnet powder produced by the ultra-quenching method is heat-curable for the purpose of increasing the fluidity of the resin by heating during compression molding to increase the density and performance. It is disclosed that a magnet to which resin is added and compression-molded is heated at the time of molding.

Regarding the degree of heating, heating at a temperature of 30 ° C. or higher and 100 ° C. or lower can maintain a high fluidity before the resin is cured, so that high density is possible.
By heating at a temperature of 00 ° C. or higher, the resin curing started in many areas, and the resin did not adhere to the molding die or did not have a sufficiently high density, and the resin cured. Then, from Example 2, the atomic ratio Nd ₁₄ F
e ₇₆ Co ₅ B ₅ powder obtained by the ultra-quenching method was used, epoxy resin was added, and compression molding was performed.
It is disclosed that a density of 6.7 to 7.1 g / cm ³ and a magnetic property ((BH) max) of 10.3 to 11.2 MGOe were obtained at ˜77 ° C.

According to the disclosure, a rare earth magnet powder is used as a raw material powder, and the density is 7.1 g / by heating at the time of molding.
The magnetic characteristic ((BH) max) is 11.2 MGOe, which is a low characteristic value even though the density is increased to cm ³ . Further, the heating temperature at the time of molding is 100 ° C. or lower, and there is a problem that it cannot be used for a resin-bonded magnet that requires heat resistance.

(2) In Japanese Patent Laid-Open No. 2-116104,
In order to provide a method for producing a resin-bonded magnet in which the filling rate of magnet powder is improved in order to obtain excellent magnetic properties, compression molding is performed while heating, and compression molding is performed at a softening point of a thermosetting resin or higher. Disclosed is a resin-bonded magnet that is heat-cured after a molded body is manufactured by heating while heating to the temperature.

In the compression molding while heating, in order to enhance the deformability of the thermosetting resin, the heating of the compression molding is carried out within a temperature range from the softening point of the thermosetting resin used to the softening point + 50 ° C. It is preferable to carry out. The molded body thus obtained by compression molding is subjected to heat treatment to thermally cure the thermosetting resin. In the examples, a raw material powder obtained by mixing an ortho-cresol novolac type epoxy resin having a melting point of 40 ° C. and a rare earth magnet powder was compression-molded at a heating temperature of 100 ° C., and then the molded body was thermally cured at 120 ° C. , Density is 6.1 g / cm ³ , magnetic property ((BH)
max) discloses that 9.0 MGOe was obtained.

According to the above disclosure, in the effect of the invention, since the rare earth magnet powder is used as the raw material powder and compression molding is performed while heating during molding, the deformability of the thermosetting resin is increased and the filling rate of the magnet powder is increased. To improve the heating during compression molding,
It is said that a resin-bonded magnet having a higher density and excellent magnetic characteristics can be obtained when the temperature is higher than the melting point of the thermosetting resin used. However, although the present disclosure attempts to improve the magnetic properties by increasing the density by heating to a temperature above the softening point, as is apparent from the above examples, the density was 6.1 g / The magnetic characteristic ((BH) max) is as low as about ³ cm ^3, and the characteristic value is as low as 9.0 MGOe. Further, the disclosure relates to the production of a molded body for obtaining a resin-bonded magnet, and requires a subsequent thermosetting treatment.

(3) In Japanese Patent Application Laid-Open No. 4-11702, the amount of resin to be mixed with the magnetic powder is very small, and therefore, fine particles are formed for the purpose of providing a method for producing a resin magnet having excellent magnetic properties and physical properties. It is disclosed that the above synthetic resin powder and magnetic powder are powder-mixed, and the resulting powder mixture is compression-molded with or without applying a magnetic field and heated.

Specifically, the magnetic powder has a normal size of 0.1 to 500 μm, and the synthetic resin powder has a particle diameter of about 1/10 or less of that of the magnetic powder.
When the two powders are mixed, the synthetic resin powder is electrically and uniformly adsorbed on the surface of the magnetic powder. If heating is performed simultaneously with compression molding, there is an advantage that a resin magnet molded body can be manufactured in a single process. Further, it is disclosed that the compression molding is performed while applying a magnetic field of 15000 Oersted (Oe) in Examples 1 and 2, for example.

Then, in Example 1, a powder mixture of barium ferrite magnetic powder and polymethylmethacrylate fine powder (particle size: 0.05 to 0.06 micron) was used.
While applying an applied magnetic field of 5000 Oersted (Oe), compression molding was carried out, followed by heating and melting to obtain a magnetized resin magnet. The specific gravity at this time is 3.40 and the magnetic characteristics ((BH) m
ax) was 1.35 MGOe.

In Example 3, the neodymium-based magnetic powder (M
A powder mixture consisting of Q powder A) and polymethylmethacrylate fine powder (particle size 0.05 to 0.06 micron) is compression molded while applying an applied magnetic field of 5000 Oersted (Oe), and then heated and melted. To obtain a magnetized resin magnet. At this time, the specific gravity was 5.49 and the magnetic property ((BH) Max) was 7.3 MGOe.

In the disclosure, fine powder and hexagonal plate-like barium ferrite magnetic powder that is easily oriented or neodymium-based magnetic powder (MQ powder A) that is easily elongated and long is used as the magnetic powder, and the applied magnetic field is applied together with the resin powder. While being compression-molded, it is heated and melted to obtain a magnetized resin magnet. Therefore, according to the effect of the invention, "the resin magnet thus obtained has remarkably excellent magnetic characteristics and physical properties because the amount of the resin compounded with respect to the magnetic powder is very small." As can be seen from the examples, the specific gravity and magnetic properties are low, so it can be said that the process was omitted.

(4) Japanese Unexamined Patent Publication No. 4-349603 relates to a composite magnet powder for producing a bond magnet having excellent moldability, which reduces frictional resistance with a mold during compression molding and galling the inner surface of the mold. For the purpose of eliminating sticking and obtaining a high-density molded body, a composite magnet powder is disclosed in which the surface of magnetic powder is coated with microcapsules made of a thermopolymerization resin containing a lubricant.

In Examples 1 and 2, (Pr, Sm) C
o The composite magnet powder of the present invention comprising magnet powder was compression molded in a magnetic field of 24 KOe, and this molded body was heat-cured at 180 ° C. As a result, the density was 6.82 to 6.95 g / c.
m ³ , magnetic characteristic ((BH) max) 15.0 to 15.7
MGOe has been obtained.

According to the disclosure, a molded body is manufactured by using a micro-encapsulated composite powder made of a thermopolymerization resin in which a lubricant is included on the surface of a magnetic powder by a complicated process in order to obtain a molded body having a high density. It is heated to 180 ° C. and cured to obtain a bonded magnet having high density and excellent magnetic properties. However, there is a problem that the magnetic characteristics are low despite the fact that the manufacturing process of the raw material powder composed of the magnet powder and the resin powder is complicated and the density is increased.
In other words, increasing the density means using a large amount of expensive magnet powder and failing to obtain magnetic properties proportional to the amount used. In other words, although compression molding is performed in a magnetic field of 24 KOe, there is a problem that orientation is low.
Further, when the density of the molded body is high in this way, the resin content is low, so that the strength of the bond magnet may be lowered depending on the shape of the molded body, or the degree of freedom of the shape of the molded body may be lowered.

[0018]

DISCLOSURE OF THE INVENTION The present invention provides a resin-bonded magnet having excellent magnetic properties which has never been obtained by a compression molding method, and an economical manufacturing method.
First, the use of magnet powder with magnetic anisotropy,
Second, to make the resin-bonded magnet densified by the compression molding method, that is, to densify by reducing the resin powder or reducing the voids and containing a large amount of the magnet powder. In general, the orientation ratio decreases when the density increases, but it is necessary to use a highly oriented resin-bonded magnet, and the magnet powder with magnetic anisotropy has a low orientation due to agglomerates. There is a problem of increasing the magnetic direction of the powder to a theoretical value in which the magnetic directions are 100% aligned and reducing the voids. Another object of the present invention is to obtain a resin-bonded magnet having excellent magnetic properties and heat resistance.

[0019]

In order to improve the magnetic properties of the resin-bonded magnet produced by the compression molding method, the present inventors have found that the magnetic powder having magnetic anisotropy is 10
The magnetic properties obtained by adding a resin powder to the magnet powder (for example, 83% by volume when adding 17% resin powder) to the magnetic properties obtained by a magnet (for example, a sintered magnet) of 0%. As a result of earnest research on how to obtain magnetic properties theoretically to be achieved in a resin-bonded magnet using a certain magnet powder.

(1) From the study of the curing characteristics of thermosetting resins, a magnetic field is applied to perform magnetic field orientation when the resin is melted and liquefied, preferably when the viscosity of the liquid resin exhibits the lowest value. As a result, the magnetic orientation of the particles of the magnet powder can be most aligned, and thus the theoretically required high orientation ratio can be obtained.

(2) Further, by pressure-molding in a liquid resin under magnetic field orientation, the particles of the magnet powder are hardened while maintaining a uniform magnetic field orientation by applying a magnetic field for pressurizing in three-dimensional directions. What you can do

(3) In order to align the magnetic directions, individual particles of the magnet powder in the liquid resin undergo movements such as rotation and movement, so that gas such as air from the raw material powder or liquefaction of the resin powder is liquefied. Densification can be obtained by discharging gas such as gas components generated in the process,

(4) Furthermore, pulse application is effective as a method of applying a magnetic field when the particles of the magnet powder are aligned in the magnetic direction, and after the resin is liquefied, gas such as gas component is easily discharged by degassing under reduced pressure. What you can do

(5) Finding out that a molded body or a thermosetting resin-bonded magnet can be obtained by further heating and newly pressurizing in synchronization with the above magnetic field orientation and densification. It was. The heating temperature is 1
It has been found that it is necessary for the resin-bonded magnet having heat resistance to be 20 ° C. or higher, preferably 150 ° C. or higher, and also for improving productivity.

The present invention has been completed based on the above findings, and the method for producing a resin-bonded magnet by the compression molding method of the present invention is a magnet having magnetic anisotropy according to the principle diagram shown in FIG. From the time when the thermosetting resin powder is melted into a liquid state by heating by filling the raw material powder containing the powder and the thermosetting resin powder as the main components into a molding die capable of controlling heating and a magnetic field. It is characterized in that a magnetic field is applied to orient the magnet powder and then compression molding is performed by applying pressure.

The details of the present invention will be described below.
First, in order to obtain a resin-bonded magnet having excellent magnetic properties, it is necessary to use a magnetic anisotropic resin-bonded magnet, so magnet powder having magnetic anisotropy is used. Examples of the magnet powder having magnetic anisotropy include rare earth element R ₁ -Co magnet powder and rare earth element R ₂ -Fe.
-B type magnet powder or rare earth element R ₃ -Fe-N based magnetic powder is used. Here, the rare earth elements R ₁ and R ₃ are made of one or more kinds of rare earth elements containing Sm, and the rare earth element R ₂ is made of one or more kinds of rare earth elements containing Nd.

Therefore, the rare earth element R ₁ —Co magnet powder is Sm—Co magnet powder, and a part of Sm is Nd, Pr,
Sm-Co based magnet powder substituted with one or more of Y, Ce and Dy alloys, Sm-Co-Cu-Fe
In the system, a magnetic powder containing one or more kinds of Zr, Hf and Ti added is included.

The rare earth element R ₂ —Fe—B based magnet powder is an Nd—Fe—B based magnet powder, and a part of Nd is Dy, P.
Nd substituted with one or more alloys consisting of r and Y
-Fe-B system magnet powder, Nd-Fe-B-Co system magnet powder, Nd-Fe-B-Co system Ga, Zr, H
Magnetic powders made of plastic with one or more alloys of f, Al, Cu, Mn, Ti, and Si added are included. In addition, these magnet powders are obtained by molding magnet powders manufactured by a rapid solidification method by a hot isostatic pressing method (HIP method), and then plastically processing the bulk of the hardened magnet powders and then crushing them. There are magnetic anisotropic magnet powders. Further, there is a magnetic anisotropic magnet powder produced by the hydrogen treatment method (HDDR method). It is said that the magnet powder produced by the hydrotreating method has a lump-like particle shape and generally has a low orientation ratio, but the present invention particularly enhances the orientation ratio of the magnet powder having this shape.

Next, as the rare earth element R ₃ —Fe—N magnet powder, Sm—Fe—N magnet powder and Sm—Fe—Co magnet powder are used.
-N-based magnet powder and Sm-Fe-VN-based magnet powder are included.

The above-mentioned magnet powder having magnetic anisotropy can also be used as granulated magnet powder after being pulverized. Due to the small size of the particles, the finely divided particles are easy to move when the magnetic field is applied, and easily oriented in the magnetic field direction.

Examples of the thermosetting resin powder in the present invention include thermosetting resin powders such as epoxy resin, phenol resin and melamine resin. Regarding the characteristics of the resin powder, it is not necessary to limit the softening point of the thermosetting resin in JP-A-2-116103 to 30 to 70 ° C, and a thermosetting resin having a softening point of 70 ° C or higher can be used. . This is because a thermosetting resin having a softening point of 120 ° C. or higher is required for producing a magnetic anisotropic resin-bonded magnet that requires heat resistance. More preferably, a thermosetting resin having a softening point of 150 ° C. or higher is required. The thermosetting resin used in the present invention is a solid powder at room temperature. This is to stabilize the amount of the raw material powder fed to the mold that can control heating and magnetic field, and to keep the density, magnetic characteristics, and dimensions of the resin-bonded magnet to be obtained constant. Because.

As an additive to the thermosetting resin powder, a lubricant selected from zinc stearate, aluminum stearate, alcohol-based lubricants, etc., if necessary, and a titanate-based or silane-based coupling agent,
A small amount of a curing agent such as 4.4'-diaminodiphenylmethane (DDM) or a curing accelerator such as TPP-S (trade name, manufactured by Hokuko Kagaku Kogyo Co., Ltd.) is added. By adding these additives, it is possible to improve the molding timing control, the wettability or adhesion of the molten liquid resin to the particles of the magnet powder, and the releasability of the molded product from the mold after molding. is there.

A magnetic powder having a magnetic anisotropy of 80 to 90 is used.
Vol% and 10 to 20 vol% of thermosetting resin powder are uniformly mixed by a kneader to obtain a raw material powder. Also,
If necessary, 0.1 to 2.0 vol% of a lubricant, a curing agent, a curing accelerator, and a coupling agent are added.

Further, as the raw material powder of the present invention, not only the raw material powder produced by mixing the magnet powder having magnetic anisotropy and the thermosetting resin powder as the main components, but also JP-A-2-27801, As disclosed in JP-A-4-349602 and JP-A-4-349603, it is also possible to use a composite magnet powder in which the surface of the magnet powder is previously coated with a thermosetting resin, a lubricant and the like.

Next, the high orientation and high density will be described in detail. First, in the production of the magnetic anisotropic resin-bonded magnet of the present invention, a molding apparatus shown in FIGS.
The device shown in is used. 2 and 3 show a molding apparatus having a mechanism capable of controlling the temperature by heating in a molding apparatus capable of forming a vertical magnetic field or a horizontal magnetic field. The longitudinal magnetic field molding is effective in the case of a ring-shaped molded body oriented in the radial direction or in the case of a columnar molded body oriented in the axial direction. Further, the transverse magnetic field molding is effective when oriented in a cube or a rectangular parallelepiped or when oriented in the axial direction (uniaxial direction) of the ring.

Further, FIG. 4 shows a molding apparatus capable of degassing under reduced pressure while controlling the temperature by heating, that is, molding for discharging a gas such as a gas component contained in the liquid resin after the resin is liquefied. It is a molding apparatus having a mechanism capable of depressurizing the inside of a molding die. FIG. 2d shows a molding apparatus that can be further subjected to ultrasonic vibration, and a molding die that can apply a magnetic field composed of a static magnetic field of 10 KOe or more can be used. FIG. 6 shows a molding die capable of controlling the temperature by heating and applying a static magnetic field of 10 KOe or more or a pulse magnetic field of 10 KOe or more, preferably a magnetic field of 25 KOe or more.

After filling the raw material powder into this molding die,
Start heating. From the time when the thermosetting resin powder is melted into a liquid state by heating, a magnetic field is applied to perform an orientation treatment for aligning the magnetic directions of the particles of the magnet powder in one direction. Orientation is performed by rotating magnet powder in a liquid resin that has viscosity.
As the behavior such as movement becomes easier, the magnetic directions of many magnet powder particles are aligned in one direction in proportion to the strength of the applied magnetic field and the applied time. Theoretically, the magnetic directions of all magnet powder particles can be aligned in one direction.

The magnetic orientation states of the magnet powder particles in the liquid resin before and after the orientation treatment are shown in FIGS. FIG. 7 shows the state before applying the magnetic field, and FIG. 8 shows the state after applying the magnetic field. The magnetic field direction consists of a transverse magnetic field that is perpendicular to the vertical compression molding direction. It can be seen from FIGS. 7 to 8 that the magnetic direction of the magnet powder particles in the liquid resin is aligned in one direction from the random magnetic direction by the orientation treatment applying the magnetic field. As shown in this figure, the orientation ratio is 100% when the magnetic directions of the particles are theoretically aligned in one direction.

In order to obtain a high orientation ratio, firstly, the magnet powder is made to move easily so that the magnetic directions are aligned in a fixed direction when a magnetic field is applied in compression molding. The behavior of the viscous body made of liquid resin in the magnetic powder becomes the most free when the viscosity shows the lowest value. The viscosity (ρ) of this thermosetting resin is represented by a function of heating temperature (T) and heating time (t), and is determined by a chelatometer or a flow tester. Therefore, since the heating time showing the minimum viscosity (ρ _min ) is obtained at each heating temperature, the heating time (t) showing the minimum viscosity at a certain heating temperature (T _m ) is t∝ (T _m , ρ _min ) Is required.

FIG. 9 shows thermosetting resin powder made of epoxy resin at 100 ° C., 120 ° C., 160 ° C. and 180 ° C.
The time-dependent change of the viscosity of the liquid resin when heated to ℃ is shown. The heating time for obtaining the minimum viscosity (ρ _min ) becomes shorter as the heating temperature becomes higher. At this minimum viscosity (ρ _min ), the magnetic direction of the magnet powder is most easily aligned in one direction. In addition, increasing the density by applying pressure in the minimum viscosity (ρ _min ) region where the magnetic direction of this magnet powder is most easily aligned in one direction is more effective than applying pressure in the high viscosity region. The pressure becomes a more three-dimensional pressure and reduces the disturbance of the particles of the magnet powder from the magnetic direction.

That is, when the thermosetting resin powder is filled in the molding die, a magnetic field orientation treatment for applying a magnetic field is performed to soften the thermosetting resin powder into a liquid state. Starts to rotate, move, etc.,
This is because it takes time for the magnetic field orientation treatment so that the value of the minimum viscosity (ρ _min ) is theoretically in one direction. Then, the pressure molding is started when the value of the minimum viscosity (ρ _min ) is reached. A magnetic field is continuously applied in order to suppress the disturbance of the magnetic powder in the magnetic direction due to pressurization and to maintain the magnetic direction in one direction.

In order to obtain the next highest orientation rate, it is necessary to apply a strong magnetic field. In the present invention, when applying a magnetic field by a static magnetic field, a static magnetic field of 10 KOe or more is required. 10
This is because if it is less than KOe, it is difficult to align the magnetic directions of all the magnet powder particles in one direction in the liquid resin having high viscosity. On the other hand, in the case of the pulse system in which the magnetic field is applied discontinuously, which is different from the above-mentioned continuous magnetic field application, 10 KO is also applied.
A magnetic field of e or more is required, and a magnetic field strength of 25 KOe or more is preferable in the case of alignment treatment for a short time.

Further, in order to increase the orientation ratio for aligning the magnetic directions of the magnet powder in one direction, it is preferable to apply ultrasonic vibration to the liquid resin and the magnet powder. The ultrasonic vibration has a frequency of 20 kHz to 50 kHz. 20k
If it is less than Hz, it is not enough to vibrate the magnet powder particles in the liquid resin having a high viscosity, and if it exceeds 50 kHz, the amplitude becomes small and the efficiency of vibrating the magnet powder decreases.

In order to improve the magnetic characteristics by increasing the density, compression molding is performed by applying pressure while applying a magnetic field. In this pressurization, the higher the molding pressure is, the more the resin-bonded magnet having the higher density of the molded body can be obtained, but the life of the mold becomes shorter. In the present invention, the molding is performed at 4.0 to 10.0 ton / cm ² . Preferably, it is 6.0 to 8.0 ton / cm ² . At a low molding pressure of less than 4.0 ton / cm ² , the density of the molded body is small and the magnetic properties cannot be improved. on the other hand,
This is because the life of the mold is drastically shortened when the molding pressure exceeds 10.0 ton / cm ² .

Further, in order to increase the density, it is necessary to increase the molding pressure of compression molding and degas the gas such as air mixed from the raw material powder and the gas generated during the melting process of the raw material powder. Is. As the degassing method, there are a method of temporarily molding the raw material powder with a low molding pressure before the raw material powder is melted by heating and degassing, and a method of degassing the liquid resin after the raw material powder is melted. The apparatus shown in FIG. 4 is used as the molding apparatus.

First, the method of temporarily molding the raw material powder and degassing is performed by filling the raw material powder in a molding die and then compressing it at a molding pressure of 1.0 to 4.0 ton / cm ² . Degas gases such as air. Molding pressure is 1.0
If it is less than ton / cm ² , deaeration effect is not observed. On the other hand, when the molding pressure exceeds 4.0 ton / cm ² , it becomes difficult to degas the gas such as the gas component when the raw material powder is melted by heating and becomes a liquid resin.

Next, as a method of degassing the liquid resin after the raw material powder is melted, when the bubbles generated in the melting process of the raw material powder adhere to the surface of the magnet powder, the magnet powder is By applying a magnetic field to the particles, it is possible to perform deaeration in which bubbles separate from the particle surface of the magnet powder when the magnet powder behaves such as rotating and moving in the liquid resin.

Further, it is preferable that the bubbles floating in the liquid resin together with the bubbles adhering to the surface of the magnetic powder particles are depressurized and degassed from the liquid resin by depressurizing the inside of the mold. As degassing conditions, 10-500T
Degas under reduced pressure at orr. This is because if it is lower than 10 Torr, the liquid resin is drawn together with the gas in the liquid resin, and if it is higher than 500 Torr, degassing due to reduced pressure is not performed.

The hardening treatment of the molded body is carried out by applying compression while applying a magnetic field, followed by heating while maintaining heating.
In this case, a continuous production system can be adopted and the dimensions of the final product can be controlled. Further, it may be taken out from the mold after compression molding and newly heated in a heating furnace.

In the magnetic anisotropic resin-bonded magnet of the present invention, the maximum energy product ((BH) max) is represented by the following formula: Y
It is desirable to have MGOe or higher.

In general, the maximum energy product ((BH) ma
x) is 100 of magnetic anisotropic magnet powder A in which XMGOe is used.
Energy product ((BH) ma)
x) is magnetic anisotropic magnet powder A for X ₁₀₀ MGOe
Is theoretically X _v
It is MGOe. FIG. 10 shows the region (X ₁₀₀ ) of the maximum energy product ((BH) max) of the sintered magnet, and FIG. 11 shows the maximum energy product ((BH) of the sintered magnet of the resin-bonded magnet.
(max) region (X _v ). From this figure, the maximum energy product ((BH) max) of the sintered magnet of the resin-bonded magnet
Is proportional to the square of the volume ratio of the magnet powder when resin is added to the sintered magnet. The present invention has a maximum energy product ((BH) max) of 80% or more of theoretically obtained X _v MGOe.

[0052]

[Equation 1]

Here, V ₁ represents the volume ratio (vol%) of the magnet powder in the magnetic anisotropic resin-bonded magnet, and V ₁
= 80 to 90%. X ₁ represents the maximum energy product ((BH) max) of the magnet powder used as a raw material for the magnetic anisotropic resin-bonded magnet, and it is preferable to use X ₁ ≧ 30 MGOe as the magnet powder having magnetic anisotropy. .

Further, the magnetic anisotropic resin-bonded magnet of the present invention has a maximum energy product ((BH) max) of 20.0M.
It is desirable to have GOe or higher.

[0055]

According to the present invention, when the raw material powder of the magnetic anisotropic resin-bonded magnet is molded, the molding die is heated to apply a magnetic field under the liquid state of the resin to change the magnetic direction of the magnet powder particles. Since the particles are aligned and pressed, the density of the magnet powder can be increased and the orientation ratio of the magnet powder particles can be improved. Further, the density can be improved by degassing gas such as gas in the liquid resin or by preforming prior to compression molding of the raw material powder. The orientation rate can be improved by applying ultrasonic vibration or applying a pulsed magnetic field.

Also, the maximum energy product ((B
It is possible to obtain a magnetic anisotropic resin-bonded magnet that achieves a maximum energy product ((BH) max) of 80% or more of the theoretical value of (H) max).

[0057]

EXAMPLES The present invention will be described in detail below.
The adjustment of the raw material powder used in each example will be described in advance. The raw material powder is prepared by mixing the magnet powder for raw material powder and the thermosetting resin powder at a predetermined ratio. As the raw material magnet powder, N produced by the HDDR processing method was used.
Three types of raw material magnet powders are used: d-Fe-B based magnet powder, Sm-Fe-N based magnet powder produced by mechanical pulverization after nitriding treatment, and Sm-Co based magnet powder produced by pulverization. On the other hand, as the thermosetting resin powder, one kind of thermosetting resin powder is prepared and used for the above-mentioned three kinds of raw material magnet powders.

First, a method for adjusting the thermosetting resin powder mixed with the magnet powder for raw material powder will be described. To 100 of epoxy resin powder (trade name Epicoat 1004 manufactured by Yuka Shell Epoxy Co., Ltd.) as a main agent, diaminodiphenylmethane (called DDM) (manufactured by Wako Pure Chemical Industries, Ltd.) as a curing agent 5 and as a curing accelerator Name TPP-
S (manufactured by Hokuko Kagaku Kogyo Co., Ltd.) and Hoechst S (manufactured by Hoechst Japan) under the trade name as an internal release agent were weighed at a compounding ratio of 2.2, heated and mixed, and then ground to obtain a mixed resin powder.
A coupling agent was added to the mixed resin powder thus obtained in an amount of 0.5 wt. % Of a coupling agent was added to prepare a thermosetting resin powder used as a raw material powder. In each of the following examples, the adjusted raw material powder is used as the thermosetting resin powder (A).

Next, a method for producing three types of magnet powders for raw material powders will be described below. First, Nd-Fe-B
The system magnet powder is as follows. Nd-Fe-B based magnet alloy is melted with 30 kg VIM and the basic composition is Nd _12.5 F
An ingot consisting of e _59.1 Co _20.5 B _6.1 Ga _1.8 was produced. The ingot was put into a vacuum annealing furnace, evacuated to a vacuum, introduced with Ar gas, heated at 1100 ° C. in an atmosphere of 200 Torr, and subjected to soaking heating at 40 Hr. HD of this ingot
It was subjected to DR treatment. The processing condition of HDDR is 1.3 kg /
3H at 800 ° C in a pressurized hydrogen gas atmosphere of cm ^2.
Then, hydrogen storage treatment was performed for 1 hr, and then dehydrogenation treatment for 1 hr was performed at 800 ° C. in a vacuum atmosphere of 3 × 10 ⁻⁵ Torr. After that, it is rapidly cooled and aggregates of fine powder (hydrogen decay products)
I got The hydrogen disintegration product was disentangled in a mortar to obtain a magnet powder, which was ball-milled in n-hexane and classified to obtain a magnet powder for raw material powder having a particle size of 212 μm or less.

The magnetic properties of the magnet powder for raw material powder thus obtained were measured by a VSM vibration type magnetometer, and as a result, the maximum energy product ((BH) max) was 36.0 MGOe and the residual magnetic flux density (Br) was 12.8 kG. The coercive force (iHc) was 11.5 kOe. In each of the following examples, the magnet powder for raw material powder having the basic composition and the magnetic characteristics produced by the above manufacturing method is used as the Nd-Fe-B system magnet powder (P1).

Secondly, the Sm-Fe-N magnet powder is as follows. Sm-Fe based magnet alloy 30kgVIM
And melted to _prepare an ingot having a composition of Sm _12.0 F _88.0 . This ingot was crushed into pieces of about 30 mm, and this was crushed in ammonia decomposition gas at 450 ° C. for 3 hours.
Was subjected to a nitriding treatment. Then, 4 in Ar gas atmosphere
Diffusion treatment of 1 Hr was performed at 50 ° C., and ball milling was performed in n-hexane to obtain a magnet powder for raw material powder having a particle size of 1 to 3 μm. The basic composition of the obtained magnet powder is Sm _9.0.
It was F _77.0 N _13.6 .

The magnetic properties of the magnet powder for raw material powder thus obtained were measured by a VSM vibration type magnetometer, and as a result, the maximum energy product ((BH) max) was 35.0 MGOe and the residual magnetic flux density (Br) was 13.0 kG. The coercive force (iHc) was 8.8 kOe. In each of the following examples, a raw material magnet powder having the basic composition and magnetic characteristics produced by the above-described manufacturing method was used as an Sm-Fe-B based magnet powder (P2).
To use as.

Thirdly, the Sm-Co type magnet powder is as follows. Sm-Co based magnet alloy is melted with 30 kg VIM and the basic composition is Sm _10.8 Co _54.4 Cu _6.2 Fe _25.9 Z
An ingot consisting of r _2.7 was produced. This ingot was soaked for 30 hours at 1180 ° C. in an Ar gas atmosphere, and then 800 ° C. in an Ar gas atmosphere.
24 hour aging treatment was performed. Next, a lump of about 30 mm was crushed and mechanically crushed to 500 μm or less in an Ar gas atmosphere, and then ball milled in n-hexane to obtain a magnet powder for raw material powder of 30 μm or less.

The magnetic properties of the magnet powder for raw material powder thus obtained were measured by a VSM vibration type magnetometer, and the maximum energy product ((BH) max) was 31.0 MGOe and the residual magnetic flux density (Br) was 12.0 kG. The coercive force (iHc) was 11.5 kOe. In each of the following examples, the raw material magnet powder having the basic composition and magnetic properties produced by the above-described manufacturing method is used as the Sm-Co based magnet powder (P3).

Example 1. As a magnet powder for raw material powder, N
Three types of d-Fe-B magnet powder (P1), Sm-Fe-B magnet powder (P2) and Sm-Co magnet powder (P3) are used. Magnet powder for raw material powder is 83vol
%, The thermosetting resin powder (A) was weighed and mixed at a mixing ratio of 17 vol% to prepare a raw material powder. As the forming device, the transverse magnetic field forming method shown in FIG. 11b was used.

The raw material powder was fed to a molding die which was heated to 150 ° C. and held. 16 from the time when the thermosetting resin powder (A) melts to become liquid and the viscosity of the resin decreases
Application of the magnetic field of kOe was started. Next, pressurization was started after a heating time at which the minimum viscosity was obtained by heating at 150 ° C. (60 seconds after the start of powdering). Pressing force is 8.
It is 0 ton / cm ² . Thus, the magnetic field and the pressure molding are simultaneously performed while maintaining the heating temperature at 150 ° C., and the application of the magnetic field is completed when the crosslinking reaction of the liquid resin proceeds and the viscosity increases. Then, heating and pressurization are completed, and the resin-bonded magnet is taken out from the molding die. The curing treatment of this resin-bonded magnet was carried out by holding it at 150 ° C. for 30 minutes. The shape and dimensions of the resin-bonded magnet produced by molding in this example and the following comparative examples 1 and 2 are 10 × 10 × 7 mm.
Is a rectangular parallelepiped. In the following examples and comparative examples, the resin-bonded magnet had a shape and dimensions of 10 × 10 × 7 m.
It is a rectangular parallelepiped of m.

Comparative Example 1-1 corresponding to Example 1
In the case of, the raw material powder was fed to a molding die and pressure molding was performed at room temperature. The applied pressure is 8.0 ton / cm ² . The magnetic field applied during molding is 16 kOe. Next, this molded body was subjected to a curing treatment (curing treatment) at 150 ° C. for 30 minutes.

Further, in Comparative Example 1-2, the raw material powder was fed to the molding die heated and held at 70 ° C. to obtain 8.0 ton / c.
Pressure molding was performed with a pressing force of m ² . The magnetic field applied during molding is 16 kOe. Next, this molded body is heated to 150 ° C.
Then, a curing treatment was performed for 30 minutes.

Table 1 shows Example 1 and Comparative Examples 1-1 to 1-1.
The result of measuring the maximum energy product ((BH) max) of the resin-bonded magnet obtained in No. 2 is shown. Table 1
The values in parentheses in the examples are obtained by using a percentage as a ratio to the theoretical value of the resin-bonded magnet obtained when anisotropic magnet powder having predetermined magnetic characteristics is used.

[0069]

[Table 1]

From the results of Table 1, as shown in this embodiment, N
Maximum energy product ((BH) max) of d-Fe-B system resin-bonded magnet and Sm-Fe-N system resin-bonded magnet
Of about 20 MGOe is obtained, and that of the Sm-Co based resin-bonded magnet is about 17 MGOe, which is a high-performance magnetic anisotropic fat-bonded magnet for each of the comparative examples. is there. Further, all of the resin-bonded magnets ensure 80% of theoretically obtained magnetic characteristics, and are excellent magnetic anisotropic fat-bonded magnets due to high orientation. Incidentally, the comparative example is limited to 42 to 63%.

Example 2. After feeding the raw material powder to a molding die at room temperature and performing temporary molding at 3.0 ton / cm ² , the molding die was heated to 150 ° C. and held. Then, the resin-bonded magnet was taken out from the molding die by treating under the same conditions as in Example 1. The curing treatment of this resin-bonded magnet was carried out by holding it at 150 ° C. for 30 minutes.

[0072] As the comparative example 2, and Kyuko the raw material powder to mold, after performing the temporary molded at 3.0 ton / cm ^2, pressing at 8.0ton / cm ² pressure Was done. The magnetic field applied during molding is 16 kOe. Then, the molded body was cured at 150 ° C. for 30 minutes.

Table 2 shows the maximum energy product ((BH) ma of the resin-bonded magnets obtained in Example 2 and Comparative Example 2.
The result of having measured x) is shown.

[0074]

[Table 2]

From the results of Table 2, the results of Example 1 (Table 1)
The maximum energy product ((BH) max) is 0.2 compared to
Improvement of magnetic characteristics of 0.5 MGOe is attempted. On the other hand, Comparative Example 2 has the same magnetic characteristics as Comparative Example 1-1. It can be said that the provisional molding suppresses the formation of bridges between the particles of the magnet powder and achieves high density.
This is because the Sm-Fe-N resin-bonded magnet made of fine powder particles has a great improvement in magnetic characteristics. From Comparative Example 2, it can be said that the effect is not obtained when the molding die is not heated as in Example. In addition, any of the resin-bonded magnets has theoretically obtained magnetic characteristics of 81 to 84.
%, Which is an excellent magnetic anisotropy fat-bonded magnet due to high orientation. The comparative example was 42 to 49%.

Example 3. In this example, the resin-bonded magnet produced in Example 1 was not taken out from the molding die, and subsequently cured in the molding die held at 150 ° C. for 5 minutes. In Comparative Example 3, the resin-bonded magnet was taken out of the molding die and newly stored at 150 ° C. for 30 minutes.
A curing treatment for 1 minute was performed. Table 3 shows the results of measuring the maximum energy product ((BH) max) of the resin-bonded magnets obtained in Example 3 and Comparative Example 3.

[0077]

[Table 3]

From the results shown in Table 3, the maximum energy product ((BH) max) of the resin-bonded magnet was almost the same regardless of the timing of the curing treatment, and the surface quality of the resin-bonded magnet was high. It does not affect the presence or absence of chips and cracks. However, by performing the curing treatment (curing treatment) in the same molding die after pressure molding, a new process can be omitted and the curing treatment time (curing treatment) can be significantly shortened from 30 minutes to 5 minutes. Can be achieved.

Example 4. In this embodiment, a molding apparatus capable of vacuum degassing shown in FIG. 4 is used. The raw material powder was fed to a molding die which was heated to and held at 150 ° C. Depressurization degassing of the liquid resin was started from the time when the thermosetting resin powder (A) was melted to become liquid and the viscosity of the resin decreased. The pressure was reduced to 450 Torr and degassing was performed with an oil rotary pump. Also, application of a magnetic field of 16 kOe was started. Next, pressurization was started after a heating time at which the minimum viscosity was obtained by heating at 150 ° C. (60 seconds after the start of powdering). The applied pressure is 8.0 ton / cm ² . In this way, application of a magnetic field and pressure molding are simultaneously performed under reduced pressure deaeration while maintaining the heating temperature at 150 ° C., and when the viscosity of the liquid resin increases due to the crosslinking reaction, application of a magnetic field and reduced pressure deaeration are terminated. Then, heating and pressurization are completed, and the resin-bonded magnet is taken out from the molding die. The curing treatment of this resin-bonded magnet was carried out by holding it at 150 ° C. for 30 minutes. Table 4 shows the results of measuring the maximum energy product ((BH) max) of the resin-bonded magnet obtained in Example 4.

[0080]

[Table 4]

From the results shown in Table 4, the maximum energy product ((BH) max) of the resin-bonded magnet was compared with the results shown in Example 1 (Table 1) and was found to be 0.
4-1.0 MGOe magnetic properties are improved, and
All of the resin-bonded magnets have obtained 83 to 84% of theoretically obtained magnetic characteristics, which is further improved by 3% as compared with Example 1 and has excellent magnetic properties due to high density and high orientation. It is an anisotropic fat-bonded magnet.

Example 5. In this example, the raw material powder was fed to a molding die which was heated to 150 ° C. and held. Application of a magnetic field of 16 kOe was started from the time when the thermosetting resin powder (A) was melted to become liquid and the viscosity of the resin decreased. At the same time, application of ultrasonic vibration of 20 kHz was started. Next, pressurization was started after a heating time at which the minimum viscosity was obtained by heating at 150 ° C. (60 seconds after the start of powdering). The applied pressure is 8.0 ton / cm ² . In this way, the magnetic field is applied and the pressure molding is simultaneously performed under ultrasonic vibration while maintaining the heating temperature at 150 ° C, and the application of magnetic field and the application of ultrasonic vibration are completed when the crosslinking reaction of the liquid resin progresses and the viscosity increases. To do. Then, heating and pressurization are completed, and the resin-bonded magnet is taken out from the molding die. The curing treatment of this resin-bonded magnet was carried out by holding it at 150 ° C. for 30 minutes. Table 5 shows the results of measuring the maximum energy product ((BH) max) of the resin-bonded magnet obtained in Example 5.

[0083]

[Table 5]

From the results shown in Table 5, the maximum energy product ((BH) max) of the resin-bonded magnet was 0.7 compared with the results shown in Example 1 (Table 1) by applying ultrasonic vibration. .About.1.3 MGOe magnetic properties were improved, and 84% to 86% of theoretically obtained magnetic properties were obtained for all resin-bonded magnets. It is an excellent magnetic anisotropic fat-bonded magnet with high density and high orientation improved by up to 5%. From this result,
Maximum level energy product ((BH) ma of Example 1)
x), the ultrasonic pressure is applied to increase the applied pressure from 8.0 ton / cm ² to 6.5 ton / cm ^2.
It can be reduced to about ² and can contribute to the improvement of the life of the molding die.

Example 6. This embodiment is composed of embodiment 6-1 of applying a magnetic field by a pulse method and embodiment 6-2 of applying a magnetic field by a pulse method and applying a predetermined magnetic field. In Example 6-1, a raw material powder was fed to a molding die which was heated to and held at 150 ° C. by using a molding device capable of longitudinal magnetic field molding (FIG. 2). 50 kO from the time when the thermosetting resin powder (A) melts to become liquid and the viscosity of the resin decreases
The application of the pulsed magnetic field of e was started. Pulse magnetic field is 0.1
The application is repeated for 2 seconds and no mark is applied for 2 seconds. Then 1
Pressing was started after the heating time at which the minimum viscosity was obtained at 50 ° C. (60 seconds after the start of powdering).
The applied pressure is 8.0 ton / cm ² . In this way, application of a magnetic field and pressure molding are carried out simultaneously while maintaining the heating temperature at 150 ° C., and when the viscosity of the liquid resin increases due to the crosslinking reaction, application of the magnetic field is terminated. Then, heating and pressurization are completed, and the resin-bonded magnet is taken out from the molding die.
The curing treatment of this resin-bonded magnet was carried out by holding it at 150 ° C. for 30 minutes.

Example 6-2 is the same as Example 6-1, except that
Simultaneously with the start of applying a 0 kOe pulse magnetic field, 16 kOe
This is an example of applying the magnetic field of.

Comparative Example 4 is an example in which the magnetic field of 16 kOe was applied without applying the pulse type magnetic field in Example 6-2.

Table 6 shows the results of measuring the maximum energy product ((BH) max) of the resin-bonded magnets obtained in Examples 6-1, 6-2 and Comparative Example 4.

[0089]

[Table 6]

From the results shown in Table 6, the maximum energy product ((BH) max) of the resin-bonded magnet is higher than that of Comparative Example 4, which is a general magnetic field application method, in the pulsed magnetic field application example. The magnetic properties of 0.3 to 0.5 MGOe were improved from 6-1 and further, 0.8 to 0.9 MGOe from Example 6-2, which is a combination of both applying methods.
The magnetic properties of are improved.

[0091]

INDUSTRIAL APPLICABILITY According to the present invention, a magnetic anisotropic resin-bonded magnet having excellent magnetic properties can be obtained.
The maximum energy product ((B
It is possible to provide a resin-bonded magnet having H) max) of 80% or more of the theoretical value. Also, the maximum energy product ((B
It is possible to obtain a resin-bonded magnet having H) max) of 20 MGOe or more.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a conceptual diagram of an apparatus having a mold heating mechanism and capable of forming a vertical magnetic field.

FIG. 3 is a conceptual diagram of an apparatus having a mold heating mechanism and capable of forming a lateral magnetic field.

FIG. 4 is a conceptual diagram of a transverse magnetic field molding apparatus having a mold heating mechanism and capable of degassing under reduced pressure.

FIG. 5 is a conceptual diagram of a transverse magnetic field molding apparatus that has a mold heating mechanism and can apply ultrasonic vibration together with degassing under reduced pressure.

FIG. 6 is a conceptual diagram of an apparatus having a die heating mechanism and capable of forming by a pulsed magnetic field and a static magnetic field.

FIG. 7 is a diagram showing a magnetic direction of particles of magnet powder in a heated mold before applying a magnetic field.

FIG. 8 is a diagram showing a magnetic direction of particles of magnet powder in a heated mold after applying a magnetic field.

FIG. 9 is an explanatory diagram of a change over time in the viscosity of the liquefied epoxy resin at each heating temperature.

FIG. 10 shows a magnet composed of 100% magnet powder (for example,
It is explanatory drawing of (BH) max obtained from the BH curve of a sintered magnet.

FIG. 11 is an explanatory diagram of (BH) max obtained from a BH curve of a magnet composed of magnet powder V% and resin (100-V)% (for example, resin-bonded magnet of magnet powder V%).

[Explanation of symbols]

 Reference Signs List 11 heating device 12 electromagnet 13 magnetic field applying direction 14 pressurizing direction 15 control device 16 magnetic direction of magnet powder particles 17 liquid resin 21 electromagnet 22a die 22b upper punch 22c lower punch 22d heating device 23 pressurizing device 24 oil rotary pump 25 Ultrasonic transducer 26 Air-core coil for pulsed magnetic field 31 Heating device 32 Electromagnet 33 Application direction of magnetic field 34 Pressing direction 35a Magnetic direction of magnet powder particles (before magnetic field orientation treatment) 35b Magnetic direction of magnet powder particles (after magnetic field orientation treatment) 36 Liquid Resin 51a (BH) max of 100% Magnet Powder 52b (BH) max of V% Magnet Powder

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H01F 7/02 C

Claims (10)

[Claims] 1. A method for producing a resin-bonded magnet by a compression molding method, wherein a raw material powder mainly composed of a magnet powder having magnetic anisotropy and a thermosetting resin powder is used for molding in which heating and a magnetic field can be controlled. A magnetic anisotropic resin bond characterized by filling a mold, then applying a magnetic field under heating to orient the magnet powder, and then compression-molding by pressurizing and then hardening the molded body. Method of manufacturing die-shaped magnet. 2. A method for producing a resin-bonded magnet by a compression molding method, wherein a raw material powder mainly composed of a magnet powder having magnetic anisotropy and a thermosetting resin powder is used for molding in which heating and a magnetic field can be controlled. When the thermosetting resin powder is filled in a mold and heated to melt and becomes liquid, a magnetic field is applied to start the orientation of the magnet powder, and subsequently, compression molding is performed by pressurization. A method for producing a magnetically anisotropic resin-bonded magnet, which comprises performing a curing treatment. 3. A method for producing a resin-bonded magnet by a compression molding method, wherein a raw material powder mainly composed of a magnet powder having magnetic anisotropy and a thermosetting resin powder is used for molding in which heating and a magnetic field can be controlled. Fill the mold with a molding pressure of 1.0-
When the thermosetting resin powder is melted by heating after temporary molding at 4.0 ton / cm ² and the viscosity of the molten thermosetting resin shows the minimum value, a magnetic field is applied to orient the magnet powder and pressurize it. A method for producing a magnetic anisotropic resin-bonded magnet, which comprises subjecting a molded body to a curing treatment after compression molding. 4. The method of claim 1, 2 or 3, wherein compression molding by pressurization is carried out while maintaining a heating state when a magnetic field is applied to the magnet powder to orient the magnet powder. 3. A method of manufacturing a magnetic anisotropic resin-bonded magnet according to 3. 5. A magnet powder having magnetic anisotropy is a rare earth element R ₁ —Co magnet powder or a rare earth element R ₂ —Fe—B.
System magnet powder or rare earth element R ₃ —Fe—N system magnet powder, and R ₁ and R ₃ consist of one or more kinds of rare earth elements containing Sm, and R ₂ is one or more kinds of rare earth elements containing Nd. 1. The method according to claim 1, wherein
A method of manufacturing a magnetic anisotropic resin-bonded magnet according to claim 2, claim 3, or claim 4. 6. In the step of orienting the magnet powder by applying a magnetic field when the thermosetting resin powder is melted into a liquid state by heating or when the viscosity of the molten thermosetting resin shows a minimum value, The method for producing a magnetic anisotropic resin-bonded magnet according to claim 5, wherein ultrasonic vibration is applied to the liquid resin and the magnet powder. 7. A magnetic field is applied to orient the magnet powder when the thermosetting resin powder is melted into a liquid state by heating or when the viscosity of the molten thermosetting resin exhibits the minimum value, and then the magnet powder is applied. The method for producing a magnetic anisotropic resin-bonded magnet according to claim 5, wherein decompression degassing for removing gas in the mold is performed in the steps up to compression molding by pressure. 8. The method for producing a magnetically anisotropic resin-bonded magnet according to claim 5, 6, or 7, wherein the magnetic powder having magnetic anisotropy is a granulated powder. 9. A resin-bonded magnet having magnetic anisotropy by compression molding, wherein: A magnetic anisotropic resin-bonded magnet having a maximum energy product of Y (MGOe) or more. 10. A resin-bonded magnet having a magnetic anisotropy obtained by compression molding has a maximum energy product of 20.0 M.
A magnetic anisotropic resin-bonded magnet having GOe or more.