KR20240008987A - Magnetic heat treatment apparatus for manufacturing anisotropic bulk magnet - Google Patents

Abstract

The present invention relates to a magnetic field heat treatment device for manufacturing anisotropic bulk permanent magnets in which the heating element can intensively apply heat to the manufacturing object inside the housing during magnetic field heat treatment and prevents heat from the heating element from being applied to the magnetic field application magnet outside the housing.

Description

Magnetic field heat treatment device for manufacturing anisotropic bulk permanent magnets {MAGNETIC HEAT TREATMENT APPARATUS FOR MANUFACTURING ANISOTROPIC BULK MAGNET}

The present invention relates to a magnetic field heat treatment device for manufacturing anisotropic bulk permanent magnets that can maximize magnetic properties during magnetic field heat treatment.

Generally, in order to manufacture permanent magnets, raw materials are first alloyed to create a phase and then pulverized through hydrogen heat treatment (HDDR) and ball milling processes. It then sequentially goes through processes such as grain boundary diffusion process (GBDP) and magnetic field alignment (mechanical alignment, compression sintering).

However, in the existing permanent magnet manufacturing method, the hard magnetic phase is first created and then pulverized, so magnetic field alignment is involved, and through the process of bulking, the alignment of the crystal grains may be disturbed. In addition, existing manufacturing methods have complicated processes, and there is a risk of oxidation and contamination.

Accordingly, a method of manufacturing permanent magnets has recently been proposed by first manufacturing amorphous bulk and then performing magnetic field heat treatment. In other words, since the amorphous bulk is first manufactured and the magnetic field heat treatment process is performed on the amorphous bulk, crystal grains can grow in the direction of the magnetic field, and as a result, the anisotropy characteristics increase and the magnetic characteristics can be maximized.

In this case, the magnetic field heat treatment device for performing the magnetic field heat treatment performs heat treatment by applying heat from the outside or outer circumference of the amorphous bulk to the amorphous bulk (hereinafter referred to as 'manufactured object').

However, the existing magnetic field heat treatment device as described above has a structure that makes it difficult to directly apply heat to the manufacturing object. That is, the distance between the permanent magnets or electromagnets (hereinafter referred to as 'magnets for applying magnetic fields') placed on both sides to apply a magnetic field to the manufacturing object and the heating element is close. Accordingly, there is a problem in that heat from the heating element is applied to the magnet for applying the magnetic field, causing degradation.

Republic of Korea Public Utility Model Publication No. 20-1986-0014794 (Publication date: December 18, 1986)

The present invention is intended to solve the above-described problems. During magnetic field heat treatment, the heating element can intensively apply heat to the manufacturing object inside the housing, and the anisotropic bulk permanent heat generating element is prevented from being applied to the magnet for applying the magnetic field outside the housing. The purpose is to propose a magnetic field heat treatment device for manufacturing magnets.

The magnetic field heat treatment apparatus for manufacturing anisotropic bulk permanent magnets according to the present invention for realizing the above-described object includes: a tube-shaped housing having a vacuum environment accommodation space therein and an inlet on one side; an insulating material case inserted and disposed on the central axis within the receiving space through the inlet and storing a manufacturing object therein; a heating element disposed adjacent to the manufacturing object inside the insulating case and heating the manufacturing object to a predetermined temperature; and magnets for applying a magnetic field that are disposed on the outside of the housing to face each other and to be spaced apart on both sides with the housing in between so as to apply a magnetic field to the manufacturing object.

In this case, a stopper member that is connected and fixed to the inlet of the housing through a connecting rod and that seals the inlet when the insulator case is inserted into the housing may be coupled to the inlet.

In addition, the stopper member may be fixed via a fastening member with one edge of the stopper positioned in contact with a flange around the outer circumference of the inlet of the housing.

In addition, the insulating case may include a first body and a second body, which have opposite storage grooves in which the manufacturing object and the heating element can be accommodated therein, and are detachably coupled to each other.

In addition, the insulation case may be formed as a body corresponding to the manufacturing object, and may include an insertion hole on at least one side to accommodate the manufacturing object therein.

Additionally, the heating elements may include at least one pair arranged to face each other with the manufacturing object stored inside the insulating case interposed therebetween.

In addition, the heating element is electrically connected to the heating element through a connection bar of the stopper member on the outside of the housing, and is controlled by a temperature controller that measures the temperature of the heating element in real time and adjusts it to a desired temperature. can do.

The present invention, configured as described above, stores the heating element and the manufacturing object in an insulating case, so that during magnetic field heat treatment, the heating element can intensively apply heat to the manufacturing object inside the housing, and the heat of the heating element is distributed to the magnetic field application magnet on the outside of the housing. The magnetic properties can be maximized by preventing any damage.

In addition, high-density, highly anisotropic bulk permanent magnets can be manufactured directly without additional processes through magnetic field heat treatment of the manufacturing object formed in amorphous bulk form.

Additionally, the size of the manufactured object can be freely adjusted during magnetic field heat treatment.

1 is a perspective view of a magnetic field heat treatment device according to the present invention;
Figure 2 is a plan view showing the internal configuration of the magnetic field heat treatment device according to the present invention;
Figure 3 is an exploded state diagram of the magnetic field heat treatment device according to the present invention;
Figure 4 is a cross-sectional view showing the internal configuration of the insulation case according to the present invention;
Figure 5 is a cross-sectional view showing the internal configuration of an insulation case according to another embodiment of the present invention;
Figure 6 is an experimental result showing the temperature change of the housing surface depending on the presence or absence of the insulating case of the present invention.

Hereinafter, the configuration and operation of specific embodiments of the present invention will be described in detail with reference to the attached drawings.

Here, in adding reference numerals to components in each drawing, it should be noted that identical components are indicated with the same reference numerals as much as possible, even if they are shown in different drawings.

Figure 1 is a perspective view of a magnetic field heat treatment device according to the present invention, and Figure 2 is a plan view showing the internal configuration of the magnetic field heat treatment device according to the present invention.

Referring to Figures 1 and 2, the magnetic field heat treatment apparatus 100 for manufacturing anisotropic bulk permanent magnets according to a preferred embodiment of the present invention includes a housing 110, an insulating case 120, a heating element 130, and a magnetic field application. It may include a magnet 140.

A detailed description of the configuration of the present invention is as follows.

First, the housing 110 can form the main body of a heating furnace for magnetic field heat treatment. This housing 110 has an accommodating space (S) in a vacuum environment within it, and may be formed in a tube shape with an inlet 111 on one side.

Additionally, a vacuum suction port 115 and a vacuum gauge 117 may be provided on the other side of the housing 110 so that the internal accommodation space S can be set to a vacuum environment. By setting the internal accommodation space (S) of the housing 110 to a vacuum environment, oxidation of the manufacturing object (M) can be prevented.

In this case, the housing 110 is preferably made of a transparent quartz material so that the internal accommodation space S can be visually confirmed during the magnetic field heat treatment process.

In addition, a flange 113 may be provided on the outer circumference of the inlet 111 of the housing 110 to facilitate fixation when inserting and coupling the insulating material case 120, which will be described later, into the housing 110.

The insulation case 120 is inserted and placed on the central axis line within the receiving space (S) through the inlet 111 of the housing 110, and the inside of the insulation case 120 contains the manufacturing object (M) and the material (M), which will be described later. The heating element 130 may be accommodated together.

Specifically, referring to FIG. 3, a stopper member 125 is coupled to the inlet 111 of the housing 110 to seal the receiving space S. In this case, the stopper member 125 may be integrally fixed via the insulating case 120 and the connecting rod 125a. Accordingly, when the insulation case 120 is inserted into the housing 110, the stopper member 125 can be used as a handle.

Preferably, the stopper member 125 may be formed in a shape and diameter corresponding to the flange 113 provided in the inlet 111. The stopper member 125 can be fixed via the fastening member 126 while the edge of one side of the stopper member 125 is placed in contact with the flange 113.

In this case, a gasket may be interposed between the flange 113 and the stopper member 125 to maintain airtightness.

Referring to FIG. 4, the insulation case 120 may have a first body 121 and a second body 123 detachably coupled so that the manufacturing object M and the heating element 130 can be accommodated therein. there is. And storage grooves 121a and 123a may be provided on opposing surfaces of the first body 121 and the second body 123.

Preferably, the insulation case 120 may have a fitting groove and a fitting protrusion shape applied to the edge of the opposing surface so that the insulating material case 120 can maintain a fixed state when the first body 121 and the second body 123 are butted together. Of course, it is not limited to this, and any structure that can fix the first body 121 and the second body 123 can be modified and applied in various ways. The heat loss of the heating element 130 can be minimized by the insulating case 120 having this structure.

In another embodiment, referring to FIG. 5, the insulation case 120 is formed of one body 127 corresponding to the manufacturing object, and may be provided with an insertion hole 127a on at least one side. That is, the manufacturing object (M) can be stored inside the insulation case 120 through the insertion hole 127a.

Referring again to FIG. 4, the heating element 130 may be placed adjacent to the manufacturing object M inside the insulating case 120. The heating element 130 can operate by receiving power, and can heat the manufacturing object M at a predetermined temperature for a predetermined time.

In this case, at least one pair of the heating elements 130 may be arranged to face each other with the manufacturing object M stored inside the insulating case 120 sandwiched between them. In the drawing, the heating element 130 is shown as an example in a state where it is faced with both sides of the manufacturing object (M), but it is not limited to this, and the heating element 130 and the heating element 130 are used to facilitate insertion or extraction of the manufacturing object (M). The manufacturing object (M) may be arranged to be spaced apart at a predetermined distance.

Additionally, a quartz sheet may be provided on one side of the heating element 130 opposite the manufacturing object (M) to improve the thermal efficiency applied to the manufacturing object (M).

In addition, the heating element 130 may be detachably coupled to the insulating case 120 to enable replacement in case of failure.

In addition, the heating element 130 is electrically connected to the heating element 130 through the connecting rod 125a of the stopper member 125 on the outside of the housing 110. It can be controlled by a temperature controller 129 (see FIG. 2). . With this temperature controller 129, the temperature of the heating element 130 can be measured in real time and adjusted to a desired temperature.

Referring again to FIG. 2, the magnetic field application magnet 140 has an N pole and an S pole on both sides of the housing 110 on the outside of the housing 110 so as to apply a magnetic field to the manufacturing object (M). The poles may be spaced apart and face each other.

In this case, since the heating element 130 is located inside the insulating case 120, degradation of the magnet 140 for applying a magnetic field due to heat of the heating element 130 can be prevented.

The magnet 140 for applying the magnetic field may use a permanent magnet or an electromagnet, but is not limited thereto, and various types of magnets may be selectively applied as long as a magnetic field can be applied to the manufacturing object M. Since the technology for applying a magnetic field to the manufacturing object (M) using the magnetic field applying magnet 140 is already known, a detailed description thereof will be omitted.

< Experiment example >

In order to compare and judge the performance of the magnetic field heat treatment device 100 of the present invention, an experiment was conducted showing the temperature change of the housing surface depending on the presence or absence of the insulating case 120.

Specifically, the embodiment is configured such that an insulating material case 120 is provided within the housing 110, and a heating element 130 is provided within the insulating material case 120 to heat the manufacturing object M.

The comparative example is a configuration in which a separate insulating case is not provided in the housing, and only a heating element for heating the manufacturing object (M) is provided.

In the Examples and Comparative Examples of this configuration, the temperature of the heating element was increased by 25°C, and the temperature change on the housing surface was measured.

As a result, as shown in FIG. 6, when the temperature of the heating element was 28 to 75°C, the surface temperature of the housing was similar in both the comparative example and the example in the range of 28 to 31°C.

However, when the heating element temperature rose above 100°C, the difference in housing surface temperature between the comparative example and the example gradually began to widen. When the heating element temperature was 325°C, the maximum value of this experiment, the housing temperature of the comparative example was 131°C, and the housing temperature of the example was 69°C. That is, the housing surface temperature of the comparative example was measured to be almost twice as high as that of the example.

As can be seen from the above experiment, the magnetic field heat treatment device 100 for manufacturing anisotropic bulk permanent magnets according to a preferred embodiment of the present invention performs magnetic field heat treatment by storing the heating element 130 and the manufacturing object (M) inside the insulating case 120. The heating element 130 can intensively apply heat to the manufacturing object (M) inside the housing 110, and the heat of the heating element 130 is not applied to the magnetic field application magnet 140 outside the housing 110. can do. Accordingly, the magnetic characteristics of the magnet 140 for applying a magnetic field can be maximized.

In addition, high-density, highly anisotropic bulk permanent magnets can be manufactured directly without additional processes through magnetic field heat treatment of the manufacturing object (M) formed in an amorphous bulk form, and the size of the manufacturing object (M) can be freely adjusted during magnetic field heat treatment. .

In the above, the present invention has been shown and described with reference to specific specific embodiments, but the present invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the technical spirit of the present invention.

100: Magnetic field heat treatment device M: Manufactured object
110: Housing S: Accommodation space
111: Inlet 113: Flange
115: suction port 117: vacuum gauge
120: insulation case 121: first body
123: second body 121a, 123a: storage groove
125: stopper member 125a: connecting rod
126: fastening member 127: body
127a: Insertion groove 129: Temperature controller
130: Heating element 140: Magnet for applying magnetic field

Claims (7)

A tube-shaped housing with a vacuum environment accommodation space inside and an inlet on one side;
an insulating material case inserted and disposed on the central axis within the receiving space through the inlet and storing a manufacturing object therein;
a heating element disposed adjacent to the manufacturing object inside the insulating case and heating the manufacturing object to a predetermined temperature; and
A magnetic field heat treatment device comprising: magnets for applying a magnetic field disposed on the outside of the housing and spaced apart from each other to face each other on both sides with the housing in between so as to apply a magnetic field to the manufacturing object.
According to paragraph 1,
In the inlet of the housing,
A magnetic field heat treatment device comprising a stopper member that is connected and fixed to the insulating case and a connecting rod and seals the inlet when the insulating case is inserted into the housing.
According to paragraph 2,
The stopper member is,
A magnetic field heat treatment device that is fixed via a fastening member with one edge of the housing in contact with a flange around the outer periphery of the inlet of the housing.
According to paragraph 2,
The insulation case is,
A magnetic field heat treatment device comprising: a first body and a second body, which have opposing storage grooves in which the manufacturing object and the heating element can be accommodated therein, and are detachably coupled to each other.
According to paragraph 2,
The insulation case is,
A magnetic field heat treatment device formed of a body corresponding to the manufacturing object, and including an insertion hole on at least one side to accommodate the manufacturing object therein.
According to paragraph 1,
The heating element is,
A magnetic field heat treatment device comprising at least one pair facing each other with the manufacturing object stored inside the insulating case interposed therebetween.
According to paragraph 1,
The heating element is,
A temperature controller that is electrically connected to the heating element on the outside of the housing through the connection bar of the stopper member and measures the temperature of the heating element in real time and adjusts it to a desired temperature.

Images