KR20160059493A - Press vacuum sintering furnace - Google Patents

Abstract

The present invention relates to a pressing vacuum sintering furnace and, more specifically, relates to a pressing vacuum sintering furnace which resolves irregular distribution of pressure applied to an object to be sintered to reduce defective products of the object to be sintered; thus manufacturing high quality sintered products, and depositing pollutants like a hydraulic oil, etc. to the object to be sintered, thereby eliminating quality lowering elements. According to the present invention, the pressing vacuum sintering furnace comprises: a sintering furnace maintaining vacuum having an internal space; a heating unit installed to provide heat, required in sintering, to the internal space; a first and a second electromagnet installed to vertically be spaced and face each other within the sintering furnace, having polarities to generate attractions between each other; a plurality of permanent magnet modules vertically installed between the first and the second electromagnet to face each other, forming pressing surfaces with areas greater than the object to be sintered on sides facing each other, generating the attraction between each other to press the object to be sintered, positioned between a mutual pressing surfaces by a magnetic force, and having the polarities to generate a repulsive force with respect to the first and second electromagnet; and a guide unit installed between the first and the second electromagnet, making the permanent magnet modules guide the object to be sintered to move in a pressing direction.

Description

[0001] The present invention relates to a vacuum sintering furnace,

The present invention relates to a squeeze vacuum sintering furnace, and more particularly, to a squeeze vacuum sintering furnace capable of producing a sintered product of high quality by reducing occurrence of defective products in sintering by eliminating uneven distribution of pressure applied to sintering sintering .

Generally, in the case of a squeeze vacuum sintering furnace, a method in which a surface of a material to be sintered is slightly melted in a high-temperature vacuum sintering furnace in order to sinter a molded body of the material to be sintered, and then the sintered material is squeezed through compression. Particularly, in the case of the pressing method, a method of directly pressing a molded body by using a hydraulic press, a method of compressing a molded body by using a vacuum pressure, and a method of pressing by using a gas pressure are mainly used.

In the case of directly pressing a molded body using a hydraulic press, there is an advantage that a press pressure of several tones or more can be applied. However, since pressure is applied in one direction through hydraulic pressure, There is a disadvantage in that the pressure distribution for molding is uneven, and there is a problem that the bonding of the resin composition is caused by the deposition of the resin composition of the hydraulic oil or causes defects. In the compression method using vacuum pressure and gas pressure, the pressure distribution for forming the composite body is selected. On the other hand, there is a disadvantage in that a pressure of several tons or more can not be applied due to the characteristics of vacuum pressure and gas pressure. In addition, when gas pressure is used, it is disadvantageous in terms of economics because it is difficult to reuse the gas due to the pollutants discharged from the firing process.

Meanwhile, there is a magnetic holding device in which permanent magnets and electromagnets are combined with each other, which is different from the above-mentioned prior art, but will be appreciated. These include yokes; A first pole piece and a second pole piece disposed inside the yoke so as to be separated from the yoke and having a holding surface for holding a magnetic body; An intermediate permanent magnet having one end abutting the first pole piece and the other end abutting the second pole piece; An electromagnet having an iron core and a coil surrounding the iron core, one end of the iron core being in contact with the first pole piece and the other end of the iron core being spaced apart from the second pole piece by a predetermined distance; And an electromagnet control device for supplying a current to the electromagnet when the holding of the magnetic body held in contact with the respective holding surfaces of the first pole piece and the second pole piece is released, The current is applied to the coil so that a line of magnetic force is formed on the iron core in a direction in which magnetic force lines return in the order of the intermediate permanent magnet-first pole piece-iron core-second pole piece-intermediate permanent magnet (or reverse order).

These conventional techniques are difficult to use in pressing the composite sintered body in the squeeze vacuum sintering furnace, and in particular, the problem of generation of defective products due to the uneven pressure applied to the composite sintered body as described above can not be solved.

Korean Patent No. 10-0968719 discloses a material inflow control apparatus for a press. This is because the lower mold having the molding surface is mounted on the lower bolster, the blank holder is mounted on the bolster through the cushion pin to the outside of the lower mold, the upper mold having the molding surface at the upper portion of the lower mold is mounted on the upper slider, An electromagnet disposed inside the die face of the blank holder for generating an electromagnetic force in accordance with a control signal of the power supply control device on a press device for pressing a material panel to be inserted between the lower mold and the product panel into a product panel; And a movable block unit for varying the local holding pressure of the material panel together with the blank holder by a movable block movable in the vertical direction by the electromagnetic force of the electromagnet in the upper mold corresponding to the die face of the blank holder Wherein the movable block unit comprises: a movable groove formed in the interior of the upper mold corresponding to the die face of the blank holder as a space; A spring groove formed at one side of the movable groove; A die face surface corresponding to a die face of the blank holder is formed on a lower end surface of the movable holder and a movable end block; A guide rod installed through the support end of the movable block through the spring groove from one side of the die face of the upper mold; And a return spring elastically supporting the support end in the spring groove.

These existing technologies are concerned with the inflow of materials, and are not only difficult to use for squeezing a composite sintered body in a squeeze vacuum sintering furnace, but also cause problems such as generation of defective products due to uneven distribution of pressure applied to a composite sintered body, Can not be solved.

Korean Patent Laid-Open No. 10-2007-0066996 discloses a pre-load structure of a superconducting CS coil and its pre-load application method. The CS coil structure is installed at the center of the inner side of the toroidal coils of the superconducting tokamak device and induces the plasma according to the change of the current value. In the CS coil structure, one side of the CS coil structure is connected to the inner upper side of the toroidal coil Wherein the CS coil structure includes a flow plate for absorbing a transverse displacement with respect to the toroidal coil at a connecting portion of the CS coil structure, and a CS coil structure for absorbing a longitudinal displacement relative to the toroidal coil, And a variable fixing part provided inside the CS coil structure and provided with a re-centering device slidable in the longitudinal direction. The superconducting coil is vertically fixed.

These conventional techniques can not overcome the problem of generation of defective products and deterioration of quality due to non-uniform distribution of pressure applied to the composite sintered body in the squeeze vacuum sintering furnace.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a sintered product of high quality by producing a sintered product of high quality by eliminating uneven distribution of pressure applied to sintering, It is an object of the present invention to solve the quality deterioration factor caused by the deposition of the same contaminants on the fired body.

According to an aspect of the present invention, there is provided a sintering furnace in which a vacuum is maintained and an internal space is maintained; A heating unit installed in the inner space to provide heat necessary for sintering; First and second electromagnets provided in the sintering furnace so as to be vertically spaced apart from each other and having magnetic poles for generating attraction force therebetween; Wherein a plurality of opposed faces are provided between the first and second electromagnets so as to oppose each other and a compression face larger in area than the body of the object to be cleaned is formed on the side opposite to each other, A permanent magnet module having a magnetic pole for generating a repulsive force with respect to the first and second electromagnets while generating attraction force between the permanent magnet modules; And a guide portion provided between the first and second electromagnets and guiding the permanent magnet module to move in a direction to squeeze the filament assembly.

The permanent magnet module includes: a permanent magnet having the magnetic pole; A first vacuum insulation layer provided to surround the outside of the permanent magnet; A refractory material provided to surround an outer side of the first vacuum insulation layer; And a second vacuum insulation layer provided to surround the outside of the refractory material.

Wherein the permanent magnet module has a coupling hole to be slidably coupled to the guide portion so as to be slidable upwardly and downwardly so as to avoid the permanent magnet and the first vacuum insulation layer, .

Wherein the first and second electromagnets are respectively disposed on the upper and lower surfaces of the sintering furnace and have a plate-like structure, and the permanent magnet module has a ratio of the same width and the same length to the shapes of the first and second electromagnets And the center of the first and second electromagnets may be aligned with the centers of the first and second electromagnets in a state where the rotation is suppressed about an axis that is perpendicular to the first and second electromagnets.

The guide portion may include a plurality of guide shafts vertically installed between the first and second electromagnets and slidably coupled to an edge of the permanent magnet module.

According to another aspect of the present invention, there is provided a sintering furnace in which a vacuum is maintained and heat is given to an internal space where sintering is performed; First and second electromagnets disposed vertically and opposed to each other in the sintering furnace; A permanent magnet module installed between the first and second electromagnets in a vertically opposed manner; And a guiding part for guiding the vertical movement of the permanent magnet module, wherein the first and second electromagnets have a magnetic pole for generating attraction force with each other, and the permanent magnet module is pressed against the mutually facing sides Wherein a force is generated between the first electromagnet and the second electromagnet so that the electromagnet is pressed between the first electromagnet and the second electromagnet by a magnetic force, Is provided.

The permanent magnet module may be formed so that the permanent magnet is placed at the center and the outer side of the permanent magnet is surrounded by the vacuum insulation layer and the refractory material.

According to the present invention, by using the repulsive force of the electromagnet and the permanent magnet and the attractive force between the permanent magnet and the permanent magnet, the resultant assembly is pressed, thereby preventing the occurrence of defective products in the formation of the filament due to the uneven pressure distribution, It is possible to solve the quality deterioration factor caused by depositing contaminants such as hydraulic oil on the bonded body by not using hydraulic equipment for pressing.

1 is a perspective view showing a squeeze vacuum sintering furnace according to an embodiment of the present invention.
FIG. 2 is a perspective view showing a substantial part of a squeeze vacuum sintering furnace according to an embodiment of the present invention. FIG.
Fig. 3 is a front view explaining the action of the squeeze vacuum sintering furnace according to one embodiment of the present invention on the recess.
4 is a plan sectional view showing a squeeze vacuum sintering furnace according to one embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In addition, the following embodiments can be modified into various other forms, and the scope of the present invention is not limited to the following embodiments.

1 is a perspective view showing a squeeze vacuum sintering furnace according to an embodiment of the present invention.

1, a squeeze vacuum sintering furnace 100 according to an embodiment of the present invention includes a sintering furnace 110, first and second electromagnets 130 and 140, a permanent magnet module 150, The sintering furnace 110 may further include a heating unit 120 for applying heat required for sintering to the sintering furnace 110.

The sintering furnace 110 maintains the airtight state so that the internal space 111 in which the sintering is performed by the vacuum applied from the external vacuum supply unit is maintained in a vacuum state and the door is opened to open and close the internal space 111 . The sintering furnace 110 may be wrapped with a refractory material so that the worker is not hurt by, for example, high temperature.

The heating unit 120 is installed to provide heat required for sintering in the inner space 111 of the sintering furnace 110. For example, the heating unit 120 may be a heating wire installed on the inner surface of the sintering furnace 110, , A halogen lamp for emitting high heat sufficient for sintering, and a variety of heating devices can be used.

As shown in FIGS. 2 and 3, the first and second electromagnets 130 and 140 are installed vertically and opposed to each other in the sintering furnace 110 (shown in FIG. 1) In this embodiment, the opposite sides of each of the first and second electromagnets 130 and 140 are shown to have N poles and S poles, respectively, or may be arranged to have opposite poles. The first and second electromagnets 130 and 140 have a function of interrupting the magnetic force or converting the magnetic poles so that the permanent magnet module 150 is installed between the permanent magnet modules 150, ) Can be reduced. The first and second electromagnets 130 and 140 may be installed on the upper and lower surfaces of the sintering furnace 110 (shown in FIG. 1), respectively, and may have a plate-like structure, for example, a rectangular plate-like structure.

A plurality of permanent magnet modules 150 are provided so as to face each other between the first and second electromagnets 130 and 140 so as to oppose each other and have a pressing surface 151 And a repulsive force is generated with respect to the first and second electromagnets 130 and 140 while the attracting body 1 located between the pressing surfaces 151 of the first and second electromagnets 130 and 140 is pressed by the magnetic force, . The permanent magnet module 150 has a magnetic pole in which a repulsive force is generated between the permanent magnet module 150 and the first electromagnet 130 on the side facing the first electromagnet 130, The first electromagnet 140 and the second electromagnet 140 are arranged so as to have a stimulus that generates a repulsive force, and a stimulus that generates attraction between them.

As shown in FIG. 4, the permanent magnet module 150 may be formed so that the permanent magnets 152 are centered and the vacuum insulation layers 153 and 155 and the refractory 154 alternately enclose the permanent magnet 152. The permanent magnet module 150 includes a permanent magnet 152 having a magnetic pole as described above, a first vacuum insulation layer 153 surrounding the outer surface of the permanent magnet 152, A refractory material 154 provided to surround the outer side of the refractory material 154 and a second vacuum insulating layer 155 provided to surround the outer side of the refractory material 154. The permanent magnets 152 may be made of, for example, Alnico magnets, but various types of permanent magnets may be used. The first and second vacuum heat insulating layers 153 and 155 are formed of a vacuum layer in which airtightness is maintained. The inside of the vacuum layer may be formed only by vacuum, or the vacuum layer may be filled with a heat insulating material together with a vacuum.

The permanent magnet module 150 can prevent the magnetic force from being lost because the permanent magnet 152 loses its magnetic force at 600 DEG C or more due to the characteristics of the AlNiQo magnet, Since most of the heat transfer through the radiation in the sintering furnace 110 accounts for more than 90%, the radiation heat transfer can be blocked through the vacuum insulation layers 153 and 155 and the aluminum coating on the outermost side and the innermost side, The heat transfer due to conduction or convection is blocked through the refractory material 154 which is an intermediate portion of the vacuum heat insulating layers 153 and 155.

The permanent magnet module 150 has a fitting hole 156 to be slidably coupled to the guide portion 160 so as to prevent the permanent magnet 152 and the first vacuum insulating layer 153, 2 vacuum insulator layer 155. In this embodiment, the coupling hole 156 is formed to be perpendicular to the refractory material 154 and the second vacuum insulator layer 155. In this case, Thus, the engagement hole 156 for providing the heat intrusion path can avoid the permanent magnet 152 and the first vacuum insulation layer 153, thereby continuously maintaining the thermal blocking force against the permanent magnet 152. The second vacuum insulation layer 155 may be formed to be hermetically sealed so that the vacuum layer can be held at the formation site of the coupling hole 156 even if the coupling hole 156 is vertically penetrated.

The permanent magnet module 150 may have a plate-like structure in which the widths of the first and second electromagnets 130 and 140 are reduced in the same ratio as the first and second electromagnets 130 and 140, 3) can be arranged so as to be aligned with the center o (shown in Fig. 3) of the first and second electromagnets 130 and 140 while the rotation about the center of the first electromagnet 130 is suppressed. Accordingly, the first and second electromagnets 130 and 140 have an area larger than that of the permanent magnet module 150, thereby enhancing the compression efficiency of the bonded body 1 using repulsive force, which is easily controlled by the power source. The permanent magnet module 150 has a smaller area than that of the first and second electromagnets 130 and 140. The reduction ratio of the permanent magnet module 150 is reduced to the same ratio between the first and second electromagnets 130 and 140, By arranging the center o (shown in Fig. 3), it is possible to uniformly distribute the pressing force over the entire area of all of the bonded assemblies 1 and the entire surface of the bonded assemblies 1 to prevent defective bonding of the bonded assemblies 1, It is possible to further improve the quality of the sintered product.

1, the guide unit 160 is installed between the first and second electromagnets 130 and 140, and guides the permanent magnet module 150 to move in the direction in which the electromagnet assembly 1 is squeezed. The guide unit 160 may include a plurality of guide shafts 151 vertically installed between the first and second electromagnets 130 and 140 and slidably coupled to the edges of the permanent magnet module 150. The guide shaft 151 can be fixed to the corners of the first and second electromagnets 130 and 140 having a rectangular plate-like structure by, for example, screwing, fitting or welding, And may be slidably coupled to a coupling hole 156 formed at an edge of the magnet module 150. The coupling hole 156 may be provided with a bearing member made of a material resistant to high temperature so as to reduce the frictional force with the guide shaft 161.

According to the squeeze vacuum sintering furnace according to the present invention, unlike a squeeze vacuum sintering method using a conventional hydraulic press or a squeeze vacuum sintering method using a vacuum pressure or a gas pressure, the electromagnets 130 and 140 and the permanent magnets 152 By using the repulsive force and the attractive force of the permanent magnet 152 to press the bonded body 1, it is possible to prevent the occurrence of defective products of the bonded body 1 due to the uneven pressure distribution and to produce a high quality sintered product .

In addition, it is possible to solve the quality deterioration factor caused by depositing contaminants such as oil for hydraulic oil on the fired body 1 by not using hydraulic presses for pressing, for example, a hydraulic press, and as a result, Can be increased.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. It is.

1: Sintered body 110: Sintered furnace
111: internal space 120:
130: first electromagnet 140: second electromagnet
150: permanent magnet module 151: pressed face
152: permanent magnet 153: first vacuum insulating layer
154: refractory material 155: second vacuum insulating layer
156: coupling hole 160: guide portion
161: Guide shaft

Claims (7)

A sintering furnace in which a vacuum is maintained and having an internal space;
A heating unit installed in the inner space to provide heat necessary for sintering;
First and second electromagnets provided in the sintering furnace so as to be vertically spaced apart from each other and having magnetic poles for generating attraction force therebetween;
Wherein a plurality of opposed faces are provided between the first and second electromagnets so as to oppose each other and a compression face larger in area than the body of the object to be cleaned is formed on the side opposite to each other, A permanent magnet module having a magnetic pole for generating a repulsive force with respect to the first and second electromagnets while generating attraction force between the permanent magnet modules; And
A guide part installed between the first and second electromagnets and guiding the permanent magnet module to move in a direction to squeeze the electromagnet assembly;
And a sintering furnace. The method according to claim 1,
The permanent magnet module includes:
A permanent magnet having the magnetic pole;
A first vacuum insulation layer provided to surround the outside of the permanent magnet;
A refractory material provided to surround an outer side of the first vacuum insulation layer; And
A second vacuum insulation layer provided to surround the outside of the refractory material;
And a sintering furnace. The method of claim 2,
The permanent magnet module includes:
And a coupling hole for being slidably coupled to the guide portion so as to be slidable upward and downward, the permanent magnet and the squeeze vacuum sintering furnace, wherein the permanent magnet and the sintering vacuum sintering furnace are vertically formed to cover the refractory material and the second vacuum insulation layer, . The method according to claim 1,
Wherein the first and second electromagnets are arranged so that,
The sintering furnace is installed on the upper and lower surfaces of the sintering furnace,
The permanent magnet module includes:
Wherein the first and second electromagnets have a plate-like structure in which the widths and the lengths of the first and second electromagnets are reduced to the same ratio, and the center of the first and second electromagnets 2 A squeezed vacuum sintering furnace installed to align with the center of the electromagnet. The method according to claim 1,
The guide portion
And a plurality of guide shafts vertically installed between the first and second electromagnets and slidably coupled to edges of the permanent magnet module. A sintering furnace in which a vacuum is maintained and heat is given to an inner space where sintering is performed;
First and second electromagnets disposed vertically and opposed to each other in the sintering furnace;
A permanent magnet module installed between the first and second electromagnets in a vertically opposed manner; And
And a guide part for guiding vertical movement of the permanent magnet module,
Wherein the first and second electromagnets are arranged so that,
With the stimulus to generate manpower between each other,
The permanent magnet module includes:
A pressing surface is formed on the side opposite to each other and attraction force is generated between the first and second electromagnets so as to press-bond the first and second electromagnets, Lt; / RTI > sintering furnace. The method of claim 6,
The permanent magnet module includes:
A squeeze vacuum sintering furnace having a permanent magnet at the center and alternately surrounding the vacuum insulation layer and the refractory material.

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