KR100914043B1 - Magnet forming apparatus and method - Google Patents

Abstract

The magnetic body forming apparatus of the present invention includes a molding unit having a cavity, a magnetic field generating unit for generating a magnetic field in the cavity, and a vibration generating unit provided at least one side of the cavity at predetermined intervals.

The invention as described above has an effect of improving the orientation of the magnetic body by applying vibration to the molded powder or slurry.

Description

Magnetic Forming Apparatus and Magnetic Forming Method {MAGNET FORMING APPARATUS AND METHOD}

The present invention relates to a magnetic body shaping apparatus, and more particularly, to a magnetic body shaping apparatus and a magnetic body shaping method for increasing the degree of orientation of the magnetic body.

In general, a self-molded body (hereinafter referred to as a 'magnetic body') is chemically very stable because it is made of ferromagnetic oxide mainly composed of iron oxide, and is very excellent in manufacturing cost in comparison with other permanent magnets. And speakers and the like.

The magnetic body is made in a magnetic body forming apparatus including a die having a through hole formed therein, a pressing portion disposed in the interior of the through hole, and a cavity formed between the pressing portions, and specifically filling the cavity with powder for molding. It manufactures by press-pressing by a press part, applying a magnetic field to a molded powder, and performing a magnetic orientation. In recent years, efforts have been made to increase the orientation by applying a magnetic field perpendicular to the pressing direction in order to increase the orientation of the molding powder.

However, the method of orienting the molding powder only by the magnetic field as described above is at its limit, causing a problem of lowering the confidence in the degree of orientation of the magnetic material produced thereby.

In order to solve the above problems, an object of the present invention is to provide a magnetic body forming apparatus and a magnetic body forming method for increasing the degree of orientation by applying vibration to the molded powder or slurry.

The present invention applies vibration to a molding mold for producing a magnetic body to improve the degree of orientation of the magnetic body, and improves the orientation characteristics of the magnetic powders supplied to the slurry in the state in which a high magnetic field is applied by the applied vibration.

The magnetic body forming apparatus of the present invention has an effect of improving the orientation of the magnetic body by applying vibration to the molded body powder or slurry.

In addition, the present invention has an effect of improving the degree of orientation, thereby improving the reliability and quality of the magnetic body.

1 is a schematic cross-sectional view showing a magnetic body forming apparatus having a vibration generating unit according to the present invention.

2 is a cross-sectional view showing an electric field applied to the piezoelectric body according to the present invention.

3 is a cross-sectional view showing an insulating plate provided between piezoelectric bodies according to the present invention.

4 to 7 are cross-sectional views showing a modified example of the magnetic body forming apparatus with a vibration generating unit according to the present invention.

8 is a flowchart illustrating a method of forming a magnetic body according to the present invention.

<Description of the code | symbol about the principal part of drawings>

100: die 200: first pressing portion

300: second pressing unit 410: piezoelectric body

420: field generator 500: magnetic field generator

600: insulation plate 700: cavity

In order to achieve the above object, the magnetic body forming apparatus of the present invention is a molding portion having a cavity, a magnetic field generating portion for generating a magnetic field in the cavity, and the vibration generating portion provided at a predetermined interval spaced at least one side of the cavity Include.

The vibration generating unit includes a piezoelectric body and an electric field generating unit for applying an electric field to the piezoelectric body.

The molding part may include a die formed with a through hole, a pressing part disposed to be spaced apart from each other so as to be inserted into the through hole, and a cavity formed between the pressing part.

The piezoelectric body is characterized in that the insert is formed inside the pressing portion.

The piezoelectric body is characterized in that formed on the outside of the pressing portion.

An accommodating groove is formed inside the through hole formed in the die, and a piezoelectric body is provided in the accommodating groove.

The side wall of the pressing portion is provided with an accommodating portion having a predetermined groove formed therein, and the accommodating portion includes a piezoelectric body.

The piezoelectric body may be inserted into a die and formed.

The piezoelectric body is characterized in that a plurality is provided spaced apart.

Opposite surfaces of the plurality of piezoelectric bodies may be applied with the same polarity.

Insulating plates are further provided on the top and bottom of the plurality of piezoelectric elements.

An insulating plate is further provided between the plurality of piezoelectric bodies.

In addition, the magnetic body forming method of the present invention includes the step of supplying a raw material, applying a vibration to the raw material, and pressing the raw material.

Vibrating the raw material is characterized in that the vibration is applied using a piezoelectric body.

The thickness of the piezoelectric body and the frequency applied to the piezoelectric body are inversely proportional to each other.

It further comprises the step of applying a magnetic field to the raw material.

The magnetic field is applied to the raw material, the vibration is applied to the raw material, and the pressing of the raw material is characterized in that it is performed at the same time.

Vibrating the raw material, and pressing the raw material is characterized in that it is carried out at the same time.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Like reference numerals in the drawings refer to like elements.

1 is a schematic cross-sectional view showing a magnetic body forming apparatus having a vibration generating unit according to the present invention, Figure 2 is a cross-sectional view showing an electric field applied to the piezoelectric body according to the present invention, Figure 3 is between the piezoelectric body according to the present invention 4 to 7 are cross-sectional views showing a modified example of the magnetic body forming apparatus with a vibration generating unit according to the present invention, Figure 8 is a flow chart showing a magnetic body forming method according to the present invention. .

Referring to FIG. 1, the apparatus for forming a magnetic body according to the present invention includes a die 100 having a through hole formed at a central portion thereof, and a first pressing part 200 which is disposed to be spaced apart from each other so as to be inserted into the through hole in the die 100. And a cavity 700 formed between the second pressing part 300, the first pressing part 200, and the second pressing part 300 to store raw materials, that is, magnetic powder or slurry 10, and the It includes a magnetic field generating unit 500 for generating a magnetic field in the magnetic powder or slurry 10 provided in the cavity 700, and the vibration generating unit 400 provided at least one side of the cavity 700 spaced at a predetermined interval. .

The die 100 is formed in a square or cylindrical plate shape, the through hole is formed through the top and bottom of the die 100. Here, a plurality of through holes may be formed in the die 100, whereby a plurality of magnetic bodies may be manufactured in the through holes. Here, the shape of the die 100 and the through hole is not limited, and may be variously changed as necessary.

The first pressing part 200 and the second pressing part 300 are provided to face each other in the through hole, and move in a direction facing the first pressing part 200 and the second pressing part 300. It serves to pressurize the magnetic powder or slurry 10 supplied to the location. Here, the lower surface of the first pressing unit 200 and the upper surface of the second pressing unit 300 each have a predetermined shape, and the shape of the magnetic body is determined according to the predetermined shape. In addition, the second pressing unit 300 is provided with a vibration generating unit 400, the vibration generating unit 400 will be described in detail later.

The first pressing part 200 and the second pressing part 300 are the first pressing part 200 and the second pressing part 300 in a direction facing each other to press the supplied magnetic powder or slurry 10. Relative movement to move either pressurizes the magnetic powder or slurry 10. Of course, the magnetic powder or slurry 10 may be pressurized by simultaneously moving the first pressurizing part 200 and the second pressurizing part 300.

The cavity 700 is formed between the first and second pressurization parts 200 and 300, and serves to store magnetic powder or slurry 10. The shape of the cavity 700 is determined by the shape of the lower surface of the first pressing part 200 and the upper surface of the second pressing part 300. Here, a powder supply means (not shown) is connected to one side of the cavity 700 to supply magnetic powder or slurry 10 to the cavity 700, and magnetic powder in the cavity 700 by the powder supply means. Alternatively, the slurry 10 may be supplied, and the magnetic powder or the slurry 10 may be supplied through the upper portion of the through hole in a state where the first pressing part 200 is separated from the upper portion of the through hole formed in the die 100.

The magnetic field generator 500 is provided at an outer circumferential surface of the die 100, that is, spaced apart from the die 100 on the same horizontal plane as the cavity 700 by a predetermined distance, and a coil is used as the magnetic field generator 500. Do. That is, the magnetic field generating unit 500 forms a magnetic field in a direction orthogonal to the pressing direction applied by the first and second pressing units 200 and 300 to the magnetic powder or the slurry 10, whereby the magnetic powder or slurry ( 10) is oriented in the direction orthogonal to the pressing direction. Here, the magnetic field generating unit 500 may be provided in plural, and the plurality of magnetic field generating units 500 may be arranged vertically or horizontally.

On the other hand, the vibration generating unit 400 provided in the magnetic body forming apparatus according to the present invention includes a piezoelectric body 410, and the electric field generating unit 420 connected to the piezoelectric body 410 to apply an electric field to the piezoelectric body 410. The piezoelectric body 410 is provided inside the second pressing part 300. Here, the piezoelectric body 410 is a device that generates mechanical deformation, that is, vibration when an electric field is applied, and serves to convert electrical energy into mechanical vibration energy.

The piezoelectric body 410 may be formed at any position inside the second pressing part 300, which is not limited. In addition, an electric field generator 420 connected to the piezoelectric body 410 is provided on one side of the piezoelectric body 410 through the second accommodating part 300. Of course, the electric field generator 420 may be directly connected to the piezoelectric body 410 without passing through the second accommodating part 300.

When a frequency of several KHz is applied to the electric field generating unit 420, vibration is generated in the piezoelectric body 410, thereby generating vibration in the second pressing unit 300, thereby causing the first and second pressing units ( Vibration is applied to the magnetic powder or slurry 10 stored in the cavity 700 formed between the 200 and 300. Here, the frequency applied by the field generator 420 may vary depending on the thickness or material of the piezoelectric body 410. In particular, the frequency applied to the field generator 420 increases as the thickness of the piezoelectric body 410 becomes thicker. Is preferably low.

Although the vibration generating unit 400 is formed in the second pressing unit 300 in the above, the vibration generating unit 400 may be formed in the first pressing unit 200 or may be formed in both the first and second pressing units 200 and 300. Of course it can. In addition, although the vibration generating unit 400 applied the vibration to the magnetic powder or slurry 10 using the piezoelectric body 410, any configuration may be used as long as the vibration generating unit 400 is not limited thereto.

In the above, although the piezoelectric body 410 of the vibration generating unit 400 is configured as one, a plurality of piezoelectric members may be configured. However, when two or more piezoelectric bodies 410 are provided, each of the piezoelectric bodies 410 must have the same polarity.

As shown in Figure 2a, the vibration generating unit 400 and the first piezoelectric member (410a). And a second piezoelectric body 410b provided to be spaced apart from the first piezoelectric body 410a, and one electric field generator 420 is connected to the first piezoelectric body 410a and the second piezoelectric body 410b. The upper surface of the first piezoelectric material 410a and the lower surface of the second piezoelectric material 410b are provided with a negative polarity from the electric field generator 420 and face the lower surface of the first piezoelectric material 410a, which is opposite to each other. The positive surface of the second piezoelectric body 410b is applied from the electric field generator 420. Of course, (-) polarity is applied to the lower surface of the first piezoelectric material 410a, and (-) polarity is applied to the upper surface of the second piezoelectric material 410b, which is a surface facing the lower surface of the first piezoelectric material 410a. It may be. Here, the reason for giving the same polarity to the surfaces facing each other is that if the lower surface of the first piezoelectric material 410a and the upper surface of the second piezoelectric material 410b have different polarities, the first piezoelectric material 410a may have different polarities. And the vibration generated in the second piezoelectric body 410b is canceled, and thus, the first and second piezoelectric bodies 410a and 410b do not generate vibration.

In the above, the positive and negative polarities are applied to the first and second piezoelectric bodies 410a and 410b to one electric field generator 420. However, as shown in FIG. Of course, the first field generator 420a and the second field generator 420b for applying the positive polarity may be provided. That is, the first electric field generator 420a applies a negative polarity to an upper surface of the first piezoelectric material 410a and a lower surface of the second piezoelectric material 410b that is the opposite surface of the first piezoelectric material 410a. The second field generator 420b applies a positive polarity to the lower surface of the first piezoelectric body 410a and the upper surface of the second piezoelectric body 410b. Of course, the positive polarity may be applied by the first electric field generator 420a and the negative polarity may be applied by the second electric field generator 420a.

In the above description, two piezoelectric bodies 410 have been described, but the number thereof is not limited thereto. When two or more piezoelectric bodies 410 are provided, a plurality of piezoelectric bodies 410 may be disposed by giving the same polarity to opposite surfaces. Of course.

The plurality of piezoelectric members 400 may further include an insulating plate 600 to prevent the external driving unit from malfunctioning due to the electric field generated by the piezoelectric member 400.

As shown in FIG. 3A, an insulating plate 600 is provided on an upper portion of the first piezoelectric material 410a and a lower portion of the second piezoelectric material 410b. Here, the first piezoelectric body 410a, the second piezoelectric body 410b, and the insulating plate 600 may be provided in the second pressing part 300. That is, the insulating plate 600 serves to block an electric field so that an electric field generated at an upper portion of the first piezoelectric material 410a and a lower portion of the second piezoelectric material 410b does not proceed to the outside.

In addition, as illustrated in FIG. 3B, the insulating plate 600 may be further provided between the first piezoelectric body 410a and the second piezoelectric body 410b. That is, the insulating plate 600 provided in the first piezoelectric material 410a and the second piezoelectric material 410b may block electric fields generated at the lower portion of the first piezoelectric material 410a and the upper portion of the second piezoelectric material 410b so as not to interfere with each other. Can be. As described above, even when different polarities are applied to the lower portion of the first piezoelectric element 410a and the upper portion of the second piezoelectric element 410b, the vibration generated between the first piezoelectric element 410a and the second piezoelectric element 410b cancels out. It can be prevented, which has the effect of applying an electric field to the lower surface of the first piezoelectric material 410a and the upper surface of the second piezoelectric material 410b facing each other irrespective of polarity.

The piezoelectric body 410 of the vibration generating unit 400 may be formed outside the second pressing unit 300, as shown in FIGS. 4 to 6. Of course, the piezoelectric body 410 of the vibration generating unit 400 may be formed on the outer side of the first pressing unit 200, and may be formed on both the outer side of the first and second pressing units 200 and 300.

As shown in FIG. 4, the magnetic body forming apparatus includes a die 100 having a through hole formed therein, and first and second pressing parts 200 which are disposed to be spaced apart from each other so as to be inserted into the through holes in the die 100. A cavity 700 formed between the first and second pressurizing parts 200 and 300 to store the magnetic powder or the slivery 10, and the magnetic powder or slurry provided in the cavity 700 ( And a magnetic field generating unit 500 for generating a magnetic field at 10) and a vibration generating unit 400 formed at an outer side of the second pressing unit 300. Here, except for the mounting position of the vibration generating unit 400 is the same as the configuration of Figure 1, the description of the overlapping configuration is omitted.

The vibration generating unit 400 is formed outside the at least one pressing unit, specifically, outside the second pressing unit 300, and is connected to the piezoelectric body 410 and the piezoelectric body 410 to make the piezoelectric body 410. It includes the electric field generating unit 420 to apply an electric field to.

The piezoelectric body 410 of the vibration generating unit 400 has two piezoelectric bodies 410 formed to face the outer surface of the second pressing unit 300, and the electric field generating unit 420 is connected to the piezoelectric body 410. It is. Here, the number of piezoelectric bodies 410 is not limited, and a plurality of piezoelectric bodies 410 may be formed, and the electric field generating unit 420 connected to the piezoelectric body 410 may also be connected to each piezoelectric body 410.

The piezoelectric body 410 is provided on the outer side of the second pressing unit 300 which does not interfere with the die 100 surrounding the outer surface of the second pressing unit 300. Here, even if the piezoelectric body 410 is formed outside the second pressing part 300 because the second pressing part 300 has a smaller movement distance than the movement of the first pressing part 200, the second pressing part 300 is provided. ) Presses the molding powder and slurry 10, there is little interference with the die 100.

The configuration as described above can attach the piezoelectric body 410 to the outside of the second pressing unit 300 in a simple manner, so that the piezoelectric body of FIG. 1 is simply manufactured compared to the complicated manufacturing process formed in the second pressing unit. It can work.

In order to increase the vibration generating effect on the molding powder and slurry 10 stored in the cavity 700 to increase the orientation of the molding powder and slurry 10, the vibration generating unit 400 may be configured as follows.

As shown in FIG. 5, the magnetic molding apparatus includes a die 100 having a through hole formed therein and a receiving groove 110 formed on an inner surface of the through hole, and spaced apart from each other so as to be inserted into the through hole in the die 100. A cavity 700 disposed between the first and second pressurizing parts 200 and 300 and disposed between the first and second pressurizing parts 200 and 300 to store the magnetic powder or the slurry 10; A magnetic field generating unit 500 for generating a magnetic field in the magnetic powder or slurry 10 provided in the cavity 700, and a receiving groove formed in the die 100 by being formed outside the second pressing unit 300. It includes a vibration generating unit 400 including a piezoelectric body 410 accommodated in (110). Here, except for the mounting position of the vibration generating unit 400 is the same as the configuration of Figure 4, the description of the overlapping configuration is omitted.

The piezoelectric body 410 of the vibration generating unit 400 is formed with two piezoelectric bodies 410 to face the outside of the second pressing unit 300, and specifically, adjacent to the inner surface of the through hole formed in the die 100. It is formed outside the second press part 300. Here, the receiving groove 110 for accommodating the piezoelectric body 410 is formed on the inner surface of the through hole of the die 100 so that the piezoelectric body 410 is not damaged by the die 100.

The accommodating groove 110 is formed to correspond to the number and shape of the piezoelectric body 410 on the outside of the second pressing part 300, and more specifically, is formed larger than the size of the piezoelectric body 410 by a predetermined size. . That is, the accommodating groove 110 does not interfere with the piezoelectric body 410 when the second pressing part 300 moves to press the molding powder or slurry 10 stored in the cavity 700 to thereby press the piezoelectric body. 410 to prevent damage. Since the second pressing part 300 does not have a long moving distance except when pressing the molding powder or slurry 10, it is preferable to form the receiving groove 100 slightly larger than a predetermined size corresponding thereto. Of course, if the moving distance of the second pressing unit 300 is long, the size of the receiving groove 110 may be formed as large as the moving distance of the piezoelectric body 410.

The piezoelectric body 410 is connected to the electric field generating unit 420 for applying an electric field to the piezoelectric body 410, the electric field generating unit 420 and the piezoelectric body 410 on the outside of the second pressing unit 300 It is connected. Here, the number of the piezoelectric bodies 410 is not limited thereto, and a plurality of piezoelectric bodies 410 may be formed, and the electric field generating unit 420 connected to the piezoelectric body 410 may also be connected to each piezoelectric body 410. In this case, the piezoelectric body 410 of the vibration generating unit 400 is formed to be closest to the cavity 700 in which the molding powder or slurry 10 is stored, thereby sufficiently applying vibration to the molding powder or slurry 10. There is an effect that can increase the orientation efficiency of the molding powder or slurry (10).

In the above, the piezoelectric body 410 of the vibration generating unit 400 according to the present invention is formed on the outside of the second pressurizing unit 300, and the receiving groove 110 in the die 100 to accommodate the piezoelectric body 410. Although it is formed, the accommodating part 310 may be formed in the second pressing part 300, and the piezoelectric body 410 may be accommodated in the accommodating part 310.

As shown in FIG. 6, the magnetic molding apparatus according to the present invention includes a die 100 having a through hole formed therein, and first and second pressing portions which are disposed to be spaced apart from each other so as to be inserted into the through holes in the die 100. A cavity 700 formed between the 200 and 300, the first and second pressurizing parts 200 and 300 to store the magnetic powder or the slurry 10, and the magnetic powder provided in the cavity 700 or the like. The vibration generating unit 400 includes a magnetic field generating unit 500 for generating a magnetic field in the slurry 10 and a piezoelectric body 410 formed on an outer circumferential surface of the second pressing unit 300. That is, the outer side of the second pressing unit 300 is provided with an accommodating part 310 having a groove formed therein, and the piezoelectric member 410 of the vibration generating part 400 is provided in the accommodating part 310. Here, since the description of the configuration except for the second pressing unit 300 and the vibration generating unit 400 is the same as the previous configuration, a description thereof will be omitted below.

A plurality of groove-shaped accommodating parts 310 are formed on the outer side of the second pressing part 300 so as to concave inward to correspond to the shape of the piezoelectric material 410, and the piezoelectric material 410 has a plurality of accommodating parts. Respectively seated at 310. In addition, the electric field generator 420 is connected to the piezoelectric body 410 seated in the accommodating part 310.

The piezoelectric body 410 of the vibration generating unit 400 can be formed nearest to the cavity 700 in which the molding powder or slurry 10 is stored, thereby efficiently vibrating the molding powder or slurry 10. Can be added to increase the orientation efficiency. In addition, the piezoelectric body 410 of the vibration generating unit 400 is accommodated in the accommodating part 310 formed in the second pressing part 300, thereby penetrating formed in the die 100 when the second pressing part 300 moves. There is no problem of interfering with the inner surface of the hole, and the size of the accommodating part 310 may be formed considering only the size of the piezoelectric body 410 regardless of the movement of the second pressing part 300.

In the above, although the piezoelectric body 410 of the vibration generating unit 400 according to the present invention is formed inside or outside the second pressing unit 300, the die 100 may be provided.

As shown in FIG. 7, the magnetic molding apparatus according to the present invention includes a die 100 having a through hole formed therein, and first and second pressing parts which are disposed to be spaced apart from each other so as to be inserted into the through holes in the die 100. A cavity 700 formed between the 200 and 300, the first and second pressurizing parts 200 and 300 to store the magnetic powder or the slurry 10, and the magnetic powder provided in the cavity 700 or the like. And a vibration generating unit 400 including a magnetic field generating unit 500 for generating a magnetic field in the slurry 10, and a piezoelectric body 410 provided in the die 100. Here, since the description of the configuration except for the die 100 and the vibration generating unit 400 is the same as the previous configuration, a description thereof will be omitted below.

The vibration generating unit 400 includes a piezoelectric body 410 and an electric field generating unit 420 connected to the piezoelectric body 410, and the piezoelectric body 410 is provided inside the die 100. Here, an accommodating part (not shown) may be formed inside the die 100 to accommodate the piezoelectric body 410.

The piezoelectric body 410 is formed inside the die 100 located on opposite sides of the cavity 700 in which the molding powder or slurry 10 is stored, and the electric field generator 420 is formed in the piezoelectric body 410. It is connected.

A plurality of piezoelectric bodies 410 may be formed inside the die 100, and a plurality of piezoelectric bodies 410 may be formed in the vicinity of the cavity 700 in which the molding powder or slurry 10 is stored. . That is, the piezoelectric body 410 formed adjacent to the cavity 700 may efficiently vibrate the molding powder or slurry 10 stored in the cavity 700, thereby improving the orientation of the magnetic body.

Hereinafter, a magnetic body forming method according to the magnetic body forming apparatus according to the present invention will be described with reference to FIG. 8.

As shown in FIG. 8, the magnetic molding method according to the present invention includes supplying a raw material, that is, magnetic powder or slurry (S10), applying a magnetic field to the raw material, that is, magnetic powder or slurry (S20), And applying a vibration to the raw material, that is, magnetic powder or slurry (S30), and pressing the raw material, that is, magnetic powder or slurry (S40). Here, the magnetic body forming apparatus according to the present invention will be described with reference to FIG.

First, a step of supplying the magnetic powder or slurry 10 to the cavity 700 formed between the first and second pressurizing parts 200 and 300 is performed. Here, the magnetic powder or slurry 10 may be supplied from the upper portion of the through hole in a state in which the first pressing part 200 is separated from the through hole formed in the die 200, and the magnetic powder supply part (not shown) is provided in the cavity (not shown). The magnetic powder or slurry 10 may be supplied to the cavity 700 while being connected to the 700.

After the step (S10) of supplying the magnetic powder or slurry, the magnetic powder or slurry 10 from the magnetic field generating unit 500 provided on the outer peripheral surface of the die 100 on the horizontal plane magnetic field to the molding powder or slurry 10 Generating a magnetic field and applying a magnetic field to the magnetic powder or the slurry 10 so that the magnetic powder or the slurry 10 is oriented by the magnetic field (S20). Here, the magnetic field is preferably formed in a direction perpendicular to the direction in which the magnetic powder or slurry 10 to be performed later.

Subsequently, an electric field is applied from the electric field generator 420 to the vibration generator 400 formed in the second pressing part 300, that is, the piezoelectric body 410 to generate vibration in the piezoelectric body 410, and is oriented by a magnetic field. Vibration is applied to the magnetic powder or slurry according to the present invention by applying vibration to the magnetic powder or slurry 10 (S30). Here, the frequency applied to the electric field generator 420 in order to generate vibration in the piezoelectric body 410 may vary depending on the thickness or material of the piezoelectric body 410. In particular, the thicker the piezoelectric body 410 is, the electric field is generated. The frequency applied to the unit 420 is preferably low. Of course, the frequency applied to the electric field generator 420 may be variously changed to generate the most efficient vibration in the piezoelectric body 410.

Following the step (S30) of applying the vibration to the magnetic powder or slurry according to the present invention, the first pressing portion 200 is moved downward so that the first pressing portion 200 and the second pressing portion 300 at a predetermined interval. After that, the magnetic powder or slurry 10 is pressurized by applying a predetermined pressure to the first and second pressurizing parts 200 and 300.

Thereafter, the pressurized magnetic powder or slurry 10 is completed as a magnetic body having a desired shape in the cavity 700, and the first pressing part 200 is moved in a direction opposite to the pressing direction to take out the completed magnetic body to form a magnetic body. To finish.

Magnetic body molding method according to the present invention by applying a vibration along with the magnetic field to the magnetic powder or slurry (10) compared to the orientation of the magnetic powder or slurry (10) by the conventional magnetic field only magnetic powder and slurry (10) ), There is an effect that can further enhance the alignment effect.

As described above, in the magnetic body forming method, after forming a magnetic field in the molding powder or slurry, the vibration is applied and pressurized, but after the vibration and the magnetic field are formed, pressurization can be performed. Of course, it can be performed at the same time.

In the above, the molding part is formed in a configuration including a cavity between the pressing parts spaced apart to be inserted into the through hole of the die, but the configuration is not limited thereto, and provided with a cavity and a pressing part capable of storing the molding powder or slurry. The configuration of any molded part may be used.

While various embodiments of the magnetic body forming apparatus have been described above, it can be used alone or in combination.

Although described above with reference to the drawings and embodiments, those skilled in the art that the present invention can be variously modified and changed within the scope without departing from the spirit of the invention described in the claims below I can understand.

Claims (18)

A molding part including a die having a through hole formed therein, a pressing part disposed to be spaced apart from each other so as to be inserted into the through hole, and a cavity formed between the pressing part; A magnetic field generator for generating a magnetic field in the cavity; And, In the magnetic body forming apparatus comprising a vibration generating unit provided on at least one side of the cavity spaced at a predetermined interval, and having a piezoelectric body and an electric field generating unit for applying an electric field to the piezoelectric body, The piezoelectric body is a magnetic body forming apparatus, characterized in that provided in the receiving groove formed inside the through hole. delete delete delete delete delete A molding part including a die having a through hole formed therein, a pressing part disposed to be spaced apart from each other so as to be inserted into the through hole, and a cavity formed between the pressing part; A magnetic field generator for generating a magnetic field in the cavity; And, In the magnetic body forming apparatus comprising a vibration generating unit provided on at least one side of the cavity spaced at a predetermined interval, and having a piezoelectric body and an electric field generating unit for applying an electric field to the piezoelectric body, The piezoelectric body is a magnetic body forming apparatus, characterized in that provided in the receiving portion formed inside the side wall of the pressing portion. delete The apparatus of claim 1, wherein a plurality of piezoelectric bodies are provided to be spaced apart from each other. 10. The magnetic molding apparatus according to claim 9, wherein the surfaces of the plurality of piezoelectric bodies facing each other are applied with the same polarity. The apparatus of claim 9, wherein an insulation plate is further provided on the top and bottom of the plurality of piezoelectric bodies. 10. The magnetic body forming apparatus according to claim 9, wherein an insulating plate is further provided between the plurality of piezoelectric bodies. delete delete delete delete delete delete