JP2008258235A - Manufacturing method of forming body, forming device, and manufacturing method of sintered compact - Google Patents

Manufacturing method of forming body, forming device, and manufacturing method of sintered compact Download PDF

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JP2008258235A
JP2008258235A JP2007095964A JP2007095964A JP2008258235A JP 2008258235 A JP2008258235 A JP 2008258235A JP 2007095964 A JP2007095964 A JP 2007095964A JP 2007095964 A JP2007095964 A JP 2007095964A JP 2008258235 A JP2008258235 A JP 2008258235A
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powder
molded
cavity
magnetic
punch
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JP2007095964A
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JP2008258235A5 (en
JP4882834B2 (en
Inventor
Hidenori Otsu
Isamu Otsuka
Atsushi Watanabe
勇 大塚
秀則 大津
篤 渡邉
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Seiko Epson Corp
セイコーエプソン株式会社
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a forming body that has a body section and a coating layer provided so as to cover the surface of the body section and can easily manufacture an excellently functional composite forming body, where the portions contain mutually different kinds of powder, to provide a forming device, and to provide a method of manufacturing a sintered compact, where the composite forming body manufactured by the manufacturing method of the forming body is sintered. <P>SOLUTION: The manufacturing method of a forming body includes: a first process for supplying first granulation powder 51 including first powder made of a magnetic material in a cavity 15 of a molding die 10; a second process for imparting a magnetic field into the cavity 15 to attract the first granulation powder 51 onto the inner wall surface of the cavity 15; and a third process for supplying second granulation powder 52 including second powder different from the kind of first powder into the cavity 15 in which the first granulation powder 51 is formed on the inner wall surface for formation, thus obtaining the composite forming body having a two-layer structure. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a molded body, a molding apparatus, and a method for manufacturing a sintered body.
  Powder metallurgy is known as a method for producing metal parts. In the powder metallurgy method, a metal powder is molded by various molding methods, and a molded body having a desired shape (near net shape) is manufactured, or a sintered body is manufactured by firing the obtained molded body. Is the method. According to such a powder metallurgy method, it is possible to produce a large number of molded bodies and sintered bodies having a desired shape (near net shape) without performing processing such as cutting.
For example, a method is known in which a raw material powder is put into a mold, the powder is compression-molded, and then the molded body is taken out from the mold.
The molded body produced by such a method has the metal powder uniformly present throughout. For this reason, depending on the composition of the metal powder, the metal powder existing near the surface of the molded body may react with oxygen in the atmosphere to be oxidized and denatured.
For example, Patent Document 1 discloses a method for improving the corrosion resistance of a molded body by forming an amorphous metal plating layer on the surface of the molded body.
However, the method of Patent Document 1 has a problem of peeling of the plating layer due to low adhesion strength between the formed body and the plating layer.
In addition, since the plating layer is formed on the molded body, a lot of labor and cost due to the liquid phase process are required, and there is a problem that the manufacturing cost of the molded body increases.
JP 2001-189214 A
  An object of the present invention is to provide a composite molded article having a main body part and a coating layer provided so as to cover the surface of the main body part, these parts containing different types of powders and having excellent functionality. Provided are a manufacturing method and a molding apparatus for a molded body that can be easily manufactured, and a sintered body manufacturing method for manufacturing a sintered body formed by firing a composite molded body manufactured by the method for manufacturing the molded body. It is in.
The above object is achieved by the present invention described below.
In the method for producing a molded body of the present invention, a first composition containing a first powder and a binder is supplied into a cavity of a mold, and the first composition is disposed along an inner wall surface of the cavity. A first step of arranging and
A second step of supplying a second composition containing a second powder and a binder different from the first powder inside the first composition disposed along the inner wall surface;
A third step of simultaneously press-molding the first composition and the second composition supplied into the cavity;
A main body composed of a pressure-molded body of the second powder, and a coating layer formed so as to cover the outer surface of the main body and composed of the pressure-molded body of the first powder. A composite molded body is produced.
As a result, a composite molded body having a main body part and a coating layer provided so as to cover the surface of the main body part, and these parts containing different types of powders can be easily manufactured. can do.
In the method for producing a molded body according to the present invention, the first powder is made of a magnetic material, and the first composition is removed from the inner wall surface of the cavity by the magnetizing action of the first powder by a magnetic field. It is preferable to arrange | position along.
Thereby, the first powder can be easily arranged on the inner wall surface of the cavity.
In the manufacturing method of the molded object of this invention, it is preferable that a said 1st powder is a thing excellent in corrosion resistance rather than a said 2nd powder.
Thereby, the composite molded object with high corrosion resistance of an outer surface is obtained. For example, by using a powder having excellent magnetic properties as the second powder, a composite molded body having high corrosion resistance and excellent magnetic properties can be obtained.
In the method for producing a molded body of the present invention, it is preferable that the first powder contains at least one of Al, Si, Cr, and Ti as a constituent component.
These elements combine with atmospheric oxygen to produce chemically stable oxides. For this reason, the composite molded object which has especially high corrosion resistance is obtained.
In the method for producing a molded body of the present invention, the first composition is preferably a granulated powder obtained by mixing and granulating the first powder and a binder in the cavity.
Thereby, the binder which is not a magnetic material can also be adsorbed on the inner wall surface of the cavity together with the first powder. As a result, the shape retention property near the surface of the obtained molded body can be enhanced.
In the manufacturing method of the molded object of this invention, it is preferable that the said 1st powder and the said 2nd powder contain the common metal element as the structural component.
Thereby, the adhesiveness between a main-body part and a coating layer can be improved more.
In the method for producing a molded body of the present invention, a thermosetting binder is used as the binder,
It is preferable to further include a step of solidifying the binder after the third step.
Thereby, a main body portion in which the second powder is bound by the binder, and a coating layer formed by firmly fixing the first powder so as to cover the surface of the main body portion, and the first powder being bound by the binder; A composite molded body having the following is obtained.
The molding apparatus of the present invention includes a molding die having a cavity,
A powder supply means for supplying a first powder made of a magnetic material and a second powder of a different type from the first powder into the cavity;
Magnetic field applying means for applying a magnetic field in the cavity so that the first powder supplied into the cavity is adsorbed on the inner wall surface of the cavity;
The first powder is supplied into the cavity, and a magnetic field is applied in the cavity to adsorb the first powder on the inner wall surface, and then the second powder is supplied into the cavity. A main body portion formed of the second powder molded body, and a coating layer formed of the first powder molded body so as to cover an outer surface of the main body portion. The composite molded body having the above structure is manufactured.
As a result, a composite molded body having a main body part and a coating layer provided so as to cover the surface of the main body part, and these parts containing different types of powders can be easily manufactured. A possible molding device is obtained.
In the molding apparatus of the present invention, it is preferable that the magnetic field applying means includes a coil provided in the vicinity of the cavity and a power supply circuit that applies a voltage to the coil.
Thereby, the operation of the power supply circuit can control the application of the magnetic field easily and accurately.
In the molding apparatus of the present invention, the mold includes a die that constitutes a side surface of the cavity,
A lower punch that constitutes the lower surface of the cavity and is movable relative to the die;
An upper punch that constitutes the upper surface of the cavity and is movable relative to the die;
The coil is preferably provided so as to surround the die, the lower punch, and the upper punch.
This reliably generates a magnetic field in the cavity.
In the molding apparatus of the present invention, it is preferable that the die, the lower punch, and the upper punch are each made of a soft magnetic material.
Thereby, when each coil is in an energized state, a magnetic field can be generated in the die, the lower punch and the upper punch, and when each coil is in a non-energized state, the generation of the magnetic field can be stopped. That is, the generation of the magnetic field can be arbitrarily controlled.
The method for producing a sintered body of the present invention includes a step of firing the molded body produced by the method for producing a molded body of the present invention,
Composite firing comprising a main body portion made of a sintered body of the second powder and a coating layer formed to cover the outer surface of the main body portion and made of the sintered body of the first powder. It is characterized by manufacturing a ligature.
Thereby, for example, a metal powder having excellent corrosion resistance is used as the first powder, and a metal powder having excellent mechanical characteristics and electromagnetic characteristics is used as the second powder. In addition, it is possible to easily obtain a metal part having excellent corrosion resistance and corrosion resistance.
In the method for manufacturing a sintered body according to the present invention, it is preferable that an average particle diameter of the first powder is larger than an average particle diameter of the second powder.
Accordingly, when the composite molded body is gradually heated and degreased and fired, a gap is likely to occur between the particles of the first powder in the coating layer. For this reason, the decomposition product of the binder contained in the main body is easily released to the outside of the composite molded body through the gaps between the particles generated in the coating layer. As a result, the composite molded body can be degreased more reliably, and the carbon content of the sintered body can be prevented from significantly increasing compared to the carbon contents of the first powder and the second powder. be able to.
In the method for manufacturing a sintered body according to the present invention, the sintering temperature T S1 of the first powder is preferably higher than the sintering temperature T S2 of the second powder.
Thereby, when the composite molded body is gradually heated, degreased and fired to obtain a sintered body, the main body portion of the composite molded body is sintered before the coating layer. As a result, it is possible to prevent the coating layer from being sintered prior to the main body, and to reliably prevent the binder and its decomposition product from being trapped inside the composite molded body.
In the method for producing a sintered body according to the present invention, the firing condition for firing the molded body is that the molded body is heated at a temperature equal to or higher than the sintering temperature T S2 and lower than the sintering temperature T S1 . After the second powder is selectively sintered, it is preferable that the first powder is heated at a temperature equal to or higher than the sintering temperature T S1 to sinter the first powder.
Thereby, sintering can be advanced toward the outer side from the inner side of a molded object. As a result, the binder and its decomposition products remaining in the molded body are gradually released from the inside along with the sintering, and it is ensured that they remain in the finally obtained sintered body. Is prevented. As a result, it is possible to reliably prevent the carbon content of the sintered body from significantly increasing as compared with the carbon contents of the first powder and the second powder.
Hereinafter, the manufacturing method of a molded object, the forming apparatus, and the manufacturing method of a sintered body of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
<First Embodiment>
First, a first embodiment of a method for manufacturing a molded body, a molding apparatus, and a method for manufacturing a sintered body according to the present invention will be described.
FIG. 1 is a longitudinal sectional view showing a mold closing state of the first embodiment of the molding apparatus of the present invention. FIG. 2 is a longitudinal sectional view showing a mold opening state of the first embodiment of the molding apparatus of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS These are the longitudinal cross-sectional views which show typically the molded object manufactured by the manufacturing method of the molded object of this invention, FIGS. 4-6 is a figure (longitudinal section) for demonstrating the manufacturing method of the molded object concerning 1st Embodiment. Is a plan view). In the following description, the upper side in FIGS. 1 to 6 is referred to as “upper” and the lower side is referred to as “lower”.
A molding apparatus 1 shown in FIG. 1 is an apparatus for manufacturing a pressure-molded body having a cavity shape by filling powder into a cavity.
Hereinafter, each part of the shaping | molding apparatus 1 is demonstrated in detail.
A molding apparatus 1 shown in FIG. 1 molds a powder, a frame 2, a punch fixing table 3 that is fixed to the lower part of the frame 2 and fixes a lower punch described later, a plate 4 that is fixed to the upper part of the frame 2, and powder. A mold 10.
The molding die 10 includes a plate-like die 12 having a through-hole 11 penetrating vertically, a rod-like lower punch 13 provided below the die 12, and a rod-like upper punch 14 provided above the die 12. And have. A space surrounded by the die 12, the lower punch 13 and the upper punch 14 becomes a cavity 15.
The cavity 15 shown in FIG. 1 has a rectangular parallelepiped shape. The side surface of the cavity 15 is constituted by a part of the die 12, the lower surface thereof is constituted by a part of the lower punch 13, and the upper surface thereof is constituted by a part of the upper punch 14.
The die 12 is supported by plate-like die sets 121 and 122 provided on the same surface as the die 12.
The lower surfaces of the die sets 121 and 122 are connected to the upper surface of a die set connecting plate 124 provided below the die 12 via the guide posts 123 and 123, respectively. The lower surface of the die set connecting plate 124 is connected to a lower hydraulic cylinder 126 provided on the lower surface of the frame 2 via a cylinder rod 125.
With this configuration, the die sets 121 and 122 can be moved up and down by the lower hydraulic cylinder 126 via the cylinder rod 125, the die set connecting plate 124 and the guide posts 123 and 123.
Further, guide posts 127 and 127 are provided on the upper surfaces of the die sets 121 and 122, respectively.
The cylinder rod 125 is inserted through the through hole 31 provided in the punch fixing table 3.
The lower punch 13 is provided on the base plate 131.
In addition, the lower surface of the base plate 131 is connected to the upper surface of the punch fixing table 3 provided below the base plate 131 via the two columns 132 and 132. Thereby, the lower punch 13 is fixed to the frame 2.
The base plate 131 has two through holes 133 and 133, and two guide posts 123 and 123 are inserted through these through holes 133 and 133. With such a configuration, the guide posts 123 and 123 can move up and down while being guided by the through holes 133 and 133.
The upper punch 14 is provided on the lower surface of the upper punch plate 141.
Further, the upper surface of the upper punch plate 141 is connected to an upper hydraulic cylinder 143 provided on the upper surface of the plate 4 via a cylinder rod 142.
With such a configuration, the upper punch 14 can be moved up and down by the upper hydraulic cylinder 143 via the upper punch plate 141 and the cylinder rod 142.
The upper punch plate 141 has two through holes 144 and 144. Two guide posts 127 and 127 are inserted through these through holes 144 and 144. With this configuration, the guide posts 127 and 127 can move up and down while being guided by the through holes 144 and 144.
The cylinder rod 142 is inserted through the through hole 41 provided in the plate 4.
In such a molding apparatus 1, the lower punch 13 and the upper punch 14 can be moved relative to the die 12. Further, the lower punch 13 and the upper punch 14 are provided so as to be inserted into and removed from the through hole 11, respectively. Thus, the volume of the cavity 15 defined by the die 12, the lower punch 13 and the upper punch 14 changes according to the movement of the lower punch 13 and the upper punch 14, and the mold closing shown in FIG. A state and a mold open state shown in FIG. 2 in which the cavity 15 is opened can be taken.
A powder supply unit (powder supply means) 16 is provided on the die set 122.
The powder supply unit 16 includes a box-like feeder box 161 that stores the powder 5 supplied to the cavity 15, a hydraulic cylinder 162, and a cylinder rod 163 that connects the feeder box 161 and the hydraulic cylinder 162. . With this configuration, the feeder box 161 can be moved left and right on the upper surface of the die set 122 via the cylinder rod 163 by the hydraulic cylinder 162.
Here, the lower surface of the box-shaped feeder box 161 is open. For this reason, when the feeder box 161 is moved to the left side of FIG. 1 while the powder 5 is stored, and the feeder box 161 is moved above the cavity 15 as shown in FIG. 2, the powder is removed from the lower surface of the feeder box 161. 5 falls and is supplied to the cavity 15.
By the way, as shown in FIG. 1, the molding apparatus 1 includes a plurality of coils 61, 62, 63 around the cavity 15.
  Specifically, the coil 61 is embedded in the vicinity of the boundary on the die 12 side of each of the die sets 121 and 122 so as to surround the die 12. Thereby, the cavity 15 is surrounded by the coil 61. The coil 61 is connected to a power supply circuit (not shown), and a voltage is applied to the coil 61 by the power supply circuit. When a voltage is applied to the coil 61, a magnetic field is surely generated in the die 12 and the cavity 15.
  A coil 62 is provided on the lower punch 13 so as to surround the lower punch 13. A power circuit (not shown) is also connected to the coil 62, and a voltage is applied to the coil 62 by the power circuit. When a voltage is applied to the coil 62, a magnetic field is reliably generated in the lower punch 13 and the cavity 15 located above the lower punch 13, respectively.
  A coil 63 is provided below the upper punch 14 so as to surround the upper punch 14. A power circuit (not shown) is also connected to the coil 63, and a voltage is applied to the coil 63 by the power circuit. When a voltage is applied to the coil 63, a magnetic field is reliably generated in each of the upper punch 14 and the cavity 15 positioned below the upper punch 14.
That is, a plurality of coils 61, 62, 63 provided around the cavity 15 and a power supply circuit connected to each coil constitute magnetic field applying means for applying a magnetic field to the cavity 15.
The magnetic field applying means may be any means as long as it applies a magnetic field to the cavity 15, and may be replaced with a removable permanent magnet or the like around the cavity 15, for example.
The die 12, the lower punch 13 and the upper punch 14 are each made of a metal material, but are preferably made of a soft magnetic material. Thereby, when each coil 61, 62, 63 is in an energized state, a magnetic field can be generated in the die 12, the lower punch 13 and the upper punch 14, and when each coil 61, 62, 63 is in a non-energized state. The generation of the magnetic field can be stopped. That is, the generation of the magnetic field can be arbitrarily controlled.
When the die 12, the lower punch 13 and the upper punch 14 are made of a hard magnetic material, the energization of the coils 61, 62 and 63 magnetizes the die 12, the lower punch 13 and the upper punch 14. Therefore, even if the coils 61, 62, and 63 are not energized, the generation of the magnetic field may continue.
By using the molding apparatus 1 as described above, as shown in FIG. 3, a composite molded body 7 having a main body portion 72 and a coating layer 71 formed so as to cover the surface of the main body portion 72 is manufactured. be able to.
In such a composite molded body 7, the covering layer 71 is composed of a first powder molded body, while the main body 72 is a second powder molded body of a different type from the first powder. It consists of
In the composite molded body 7, the characteristics of the main body 72 and the coating layer 71 (mechanical characteristics, chemical characteristics, and electromagnetic characteristics) are set by appropriately setting the composition of the first powder and the composition of the second powder. Can be different. For this reason, the composite molded body 7 has excellent functionality.
The composite molded body 7 thus obtained becomes a powder molded body through a step of curing the binder.
On the other hand, the resulting composite molded body 7 is degreased and fired to decompose and remove the binder from the composite molded body 7 and to sinter the first powder and the second powder. Obtainable.
Next, the manufacturing method of the molded body of the present invention will be described by taking as an example a case where the molding apparatus 1 is used.
In the method for producing a molded body according to the present embodiment, a first composition containing a first powder made of a magnetic material and a binder is supplied into the cavity 15 of the mold 10, and the cavity 15 is filled with the first composition. By applying a magnetic field, the first step of adsorbing the first composition on the inner wall surface of the cavity 15 and the first powder and the kind in the cavity 15 having the inner wall surface adsorbing the first composition A second step of supplying a second composition containing a second powder and a binder different from each other, and a first step of pressure-molding the first composition and the second composition supplied into the cavity 15 3 steps.
According to this method of manufacturing a molded body, the above-described composite molded body 7 can be easily and efficiently manufactured.
Hereinafter, each process will be described sequentially.
[1] First, a binder is dissolved in a solvent to prepare a binder solution.
Examples of the binder include polyvinyl alcohol (PVA), polyvinyl pyrrolidone (PVP), zinc stearate, lithium stearate, calcium stearate, ethylene bisstearamide, ethylene vinyl copolymer, paraffin, wax, sodium alginate, agar, Examples include gum arabic, resin, and sucrose, and one or more of these can be used in combination.
Among these, polyvinyl alcohol or polyvinyl pyrrolidone is preferable. Such a binder has a strong bonding force despite being inexpensive and easily available. Moreover, since it decomposes easily by heating, there is an advantage that unintended components hardly remain, that is, the binder removal characteristic is high.
On the other hand, the solvent for dissolving the binder is not particularly limited as long as it can dissolve the binder. For example, inorganic solvents such as water, carbon disulfide, carbon tetrachloride, ketone solvents, alcohol solvents, ethers Solvent, cellosolve solvent, aliphatic hydrocarbon solvent, aromatic hydrocarbon solvent, aromatic heterocyclic compound solvent, amide solvent, halogen compound solvent, ester solvent, amine solvent, nitrile solvent, Examples thereof include organic solvents such as nitro solvents and aldehyde solvents, and one or a mixture of two or more selected from these can be used.
Next, a granulated powder of the first powder is obtained using the first powder and the binder solution. Hereinafter, the granulated powder of the first powder is referred to as “first granulated powder”.
Next, a granulated powder of the second powder is obtained using the second powder and the binder solution. Hereinafter, the granulated powder of the second powder is referred to as “second granulated powder”.
Here, the first powder is made of a magnetic material.
Examples of the magnetic material include magnetic metal materials such as Fe-based metals, Co-based metals, and Ni-based metals, and magnetic ceramic materials such as ferrite.
  On the other hand, each constituent material of the second powder is not particularly limited. For example, Fe, Ni, Co, Cr, Mn, Zn, Pt, Au, Ag, Cu, Pd, Al, W, Ti, V, Metal materials such as Mo, Nb, Zr, Pr, Nd, Sm or alloys containing these metal elements, alumina, magnesia, beryllia, zirconia, yttria, forsterite, steatite, wollastonite, mullite, cordierite, ferrite , Oxide ceramic materials such as sialon, cerium oxide, non-oxide ceramic materials such as silicon nitride, aluminum nitride, boron nitride, titanium nitride, silicon carbide, boron carbide, titanium carbide, tungsten carbide, graphite, nano Carbon-based materials such as carbon (carbon nanotube, fullerene, etc.) It can be used singly or in combination of two or more of these.
The granulation of the first powder and the second powder is, for example, rolling fluid granulation method, rolling granulation method, spray drying method (spray dryer), stirring and mixing granulation, extrusion granulation, crush granulation It can be performed by various granulation methods such as granulation and compression granulation.
Further, the weight of the binder dissolved in the solvent is preferably about 0.5 to 30 g, more preferably about 1 to 20 g, per 1 kg of the weight of the first powder or the second powder. By setting the weight of the binder to be within the above range, the surface of the first powder or the second powder is coated with a sufficient amount of binder, and a large amount of binder that does not contribute to coating is generated. Can be prevented. As a result, a granulated powder capable of producing a molded body excellent in shape retention and molding density is obtained in the steps described later.
  Further, the weight of the solvent used for dissolving the binder is preferably about 5 to 100 g, and more preferably about 7 to 70 g, per 1 g of the binder. By setting the weight of the solvent within the above range, the binder is surely dissolved, the amount of the solvent is excessively increased, the viscosity of the binder solution is remarkably lowered, and the shape retention of the molded body produced in the process described later It is possible to reliably prevent the performance from deteriorating.
  The average particle size of the first granulated powder and the second granulated powder thus obtained is preferably about 40 to 180 μm, more preferably about 45 to 140 μm, and more preferably 50 to More preferably, it is about 100 μm. By setting the average particle size of each granulated powder within the above range, when each granulated powder is filled into a mold and a molded body is formed, each granulated powder is converted into fluidity and mold. It is excellent in filling property.
In addition, when an average particle diameter is less than the said lower limit, the fluidity | liquidity of each granulated powder will not be stabilized and the size variation of a molded object may become large. On the other hand, when the average particle size exceeds the upper limit, when forming a particularly small compact, uneven filling of each granulated powder is likely to occur, and the dimensional variation of the compact may increase.
The above describes the case where granulation is performed to improve fluidity and shape retention when fine and poorly flowable powder is used as the first powder and the second powder. In the case where a powder having a high shape retention property, for example, a water atomized powder having an average particle size of 40 μm or more is used as the first and second powders, the granulation step may be omitted.
[2] Next, as shown in FIG. 4A, the mold 10 is brought into the mold open state. Then, the first granulated powder 51 is stored in the feeder box 161.
Next, the feeder box 161 is moved to the left until it reaches above the cavity 15. As a result, as shown in FIG. 4B, the first granulated powder 51 in the feeder box 161 is supplied to the cavity 15.
At this time, by appropriately setting the amount (volume) of the first granulated powder 51 supplied to the cavity 15, the thickness of the coating layer 71 in the composite molded body 7 finally obtained can be adjusted. .
The amount of the first granulated powder 51 supplied to the cavity 15 can be appropriately set by moving the die 12 in the vertical direction and changing the volume of the cavity 15.
[3] Next, as shown in FIG. 4C, the feeder box 161 is returned to the original position, and the die 12 is moved upward to enlarge the volume of the cavity 15.
The volume of the cavity 15 at this time is determined in consideration of the compression ratio when the first granulated powder 51 and the second granulated powder 52 are compressed in a process described later.
Further, the upper punch 14 is lowered until the lower surface position of the upper punch 14 becomes the upper surface position of the die 12.
[4] Next, each power supply circuit 610, 620, 630 applies a voltage to each of the coils 61, 62, 63. Thereby, magnetic fields are generated in the die 12, the lower punch 13 and the upper punch 14, respectively. This magnetic field is applied to the cavity 15.
Due to the magnetizing action of the first soft magnetic powder by this magnetic field, the first granulated powder 51 supplied into the cavity 15 is attracted to the side surface and the lower surface of the cavity 15 as shown in FIG. The
Further, a part of the first granulated powder 51 jumps upward by the magnetic field generated by the upper punch 14 and is attracted (arranged) to the lower surface of the upper punch 14 (first step). As described above, the first granulated powder 51 can be easily arranged on the inner wall surface of the cavity 15 by using the magnetizing action of the first soft magnetic powder by the magnetic field.
In the step [1], the first granulated powder 51 is manufactured in advance with the first powder and the binder, and the first granulated powder 51 is supplied to the cavity 15 in the step [2]. As a result, the first powder and the binder are supplied to the cavity 15 in a uniformly dispersed state.
Further, by supplying the first granulated powder 51 to the cavity 15 in this way, a binder that is not a magnetic material can be adsorbed to the inner wall surface of the cavity 15 together with the first powder. Thereby, the shape retention property of the surface vicinity of the molded object obtained can be improved.
Here, in the present embodiment, a magnetic field is applied to the cavity 15 by the plurality of coils 61, 62, 63 provided around the cavity 15 and the power supply circuits 610, 620, 630 connected to the coils. Magnetic field applying means is configured. According to the magnetic field application means having such a configuration, the application of the magnetic field can be easily and accurately controlled by operating the power supply circuit.
Further, by changing the voltages applied to the coils 61, 62, 63, the strength of the generated magnetic field can be made different among the side surface, the lower surface, and the upper surface of the inner wall surface of the cavity 15. Thereby, the quantity of the 1st granulated powder 51 adsorb | sucked to the side surface of the cavity 15, a lower surface, and an upper surface can be varied, respectively.
[5] Next, as shown in FIG. 5 (e), the first granulated powder 51 in the feeder box 161 is taken out and replaced with the second granulated powder 52.
[6] Next, as shown in FIG. 5 (f), the feeder box 161 is moved to the left until reaching the upper side of the cavity 15 in a state where a voltage is applied to each of the coils 61, 62, 63. Thereby, as shown in FIG.5 (f), the 2nd granulated powder 52 in the feeder box 161 is supplied to the cavity 15, and is filled (2nd process).
[7] Next, with the voltage applied to the coil 63, the feeder box 161 is returned to its original position as shown in FIG.
Next, as shown in FIG. 6 (h), the upper punch 14 is moved downward and inserted into the cavity 15, and the mold 10 is closed. As a result, the first granulated powder 51 and the second granulated powder 52 in the cavity 15 are simultaneously pressed and molded (third step). As a result, the composite molded body 7 is obtained in the cavity 15.
[8] Next, as shown in FIG. 6 (i), the upper punch 14 is moved upward to make the mold open.
Further, the die 12 is moved downward, and the composite molded body 7 in the cavity 15 is pushed up by the lower punch 13. Thereby, the composite molded body 7 can be taken out from the cavity 15.
The composite molded body 7 can be manufactured as described above.
In the present invention, the first granulated powder 51 and the second granulated powder 52 are pressed and molded at the same time, so that the main body 72 formed of a pressure molded body of the second granulated powder 52 is used. And the adhesiveness with the coating layer 71 comprised with the press-molding body of the 1st granulated powder 51 becomes high. For this reason, in the composite molded body 7, it is possible to reliably prevent the covering layer 71 from peeling from the main body portion 72.
Here, it is preferable that the 1st powder and 2nd powder used for manufacture of the composite molded object 7 contain the common metal element as the structural component. Thereby, the adhesiveness between the main-body part 72 and the coating layer 71 shown in FIG. 3 can be improved more.
In addition, it is preferable to use a powder that has better corrosion resistance than the second powder as the first powder. Thereby, the composite molded object 7 with high corrosion resistance of an outer surface is obtained. Further, for example, by using a powder having excellent magnetic properties as the second powder, a composite molded body 7 having high corrosion resistance and excellent magnetic properties can be obtained.
As the second powder, it is also possible to use a powder that is inferior in corrosion resistance despite having high characteristics such as magnetic characteristics. Thereby, the selection range of the 2nd powder can be expanded.
From this viewpoint, it is preferable that the magnetic material constituting the first powder contains at least one of Al, Si, Cr, and Ti as its constituent components. These elements combine with atmospheric oxygen to produce chemically stable oxides. For this reason, the composite molded object 7 which has especially high corrosion resistance is obtained.
  The first powder preferably has a sintering temperature higher than that of the second powder. Thereby, when the composite molded body 7 is gradually heated and degreased and fired to obtain a sintered body, the main body portion 72 of the composite molded body 7 is sintered before the coating layer 71. As a result, it is possible to prevent the coating layer 71 from being sintered before the main body portion 72, and to reliably prevent the binder and its decomposition product from being trapped inside the composite molded body 7.
  The first powder preferably has an average particle size larger than the average particle size of the second powder. Thereby, when the composite molded body 7 is gradually heated and degreased and fired, a gap is likely to be generated between the particles of the first powder in the coating layer 71. For this reason, the decomposition product of the binder included in the main body 72 is easily released to the outside of the composite molded body 7 through the gaps between the particles generated in the coating layer 71. As a result, the composite molded body 7 can be degreased more reliably, and the carbon content of the sintered body can be prevented from significantly increasing compared to the carbon contents of the first powder and the second powder. can do.
The degreasing and firing of the composite molded body 7 will be described in detail later.
In the present embodiment, the first composition is adsorbed on the inner wall surface of the cavity 15 by applying a magnetic field in the cavity 15. However, the first composition may be adsorbed by other methods. Good.
Specifically, a method of adsorbing the first composition by the action of electrostatic adsorption, a method of applying an adhesive to the inner wall surface of the cavity 15 in advance, and adsorbing the first composition by the adhesion action, etc. Is mentioned.
When these methods are used, the first powder does not necessarily need to be made of a magnetic material, and a powder made of the same material as the second powder can be used.
Next, a sintered body can be obtained by performing the following steps [9A] to [10A] on the composite molded body 7 obtained by the step [8].
[9A] First, the obtained composite molded body 7 is degreased (binder removal). Thereby, a degreased body is obtained.
The degreasing treatment is not particularly limited, but in a non-oxidizing atmosphere, for example, in a vacuum or under reduced pressure (for example, 1 × 10 −1 to 1 × 10 −6 Torr (13.3 to 1.33 × 10 −4 Pa) ), Or by performing a heat treatment in a gas such as nitrogen gas, argon gas, hydrogen gas, or ammonia decomposition gas.
In this case, the heat treatment conditions vary slightly depending on the decomposition start temperature of the binder, etc., but are preferably about 100 to 750 ° C. for about 0.5 to 20 hours, more preferably about 150 to 700 ° C. for 1 to 10 hours. It is assumed that
Further, degreasing by such heat treatment may be performed in a plurality of steps (stages) for various purposes (for example, for shortening the degreasing time). In this case, for example, a method in which the first half is degreased at a low temperature and the second half at a high temperature, a method in which low temperature and high temperature are repeated, and the like can be mentioned.
The binder may not be completely removed from the composite molded body 7 by the degreasing process. For example, a part of the binder may remain when the degreasing process is completed.
[10A] Next, the obtained degreased body is fired. By this firing, the degreased body is sintered and becomes a sintered body.
The firing temperature is not particularly limited because it varies depending on the composition and particle size of the first powder and the second powder. For example, both the first powder and the second powder are made of an Fe-based alloy. When it is, it is preferable that it is about 1100-1400 degreeC, and it is more preferable that it is about 1150-1350 degreeC.
Moreover, although baking time changes with baking temperature, it is preferable that it is about 0.5 to 20 hours, and it is more preferable that it is about 1 to 15 hours.
The firing atmosphere is preferably a reduced pressure (vacuum) or non-oxidizing atmosphere. Thereby, characteristic deterioration due to oxidation of the first powder and the second powder can be prevented.
Among these, a specific firing atmosphere under reduced pressure (vacuum) is preferably under reduced pressure (vacuum) of 1 Torr (133 Pa) or less, preferably 1 × 10 −6 to 1 × 10 −2 Torr (1.33). It is more preferable to be under reduced pressure (vacuum) of × 10 −4 to 1.33 Pa).
Further, specific non-oxidizing atmospheres are preferably an inert gas atmosphere such as nitrogen gas and argon gas, and a reducing gas atmosphere such as hydrogen gas.
Here, when the sintering temperature T S1 of the first powder is higher than the sintering temperature T S2 of the second powder, it is preferable to set the firing conditions as follows.
That is, the firing conditions are as follows. The degreased body (molded body) is heated at a temperature equal to or higher than the sintering temperature T S2 and lower than the sintering temperature T S1. After selective sintering, the first powder on the outside of the degreased body is sintered by heating at a temperature equal to or higher than the sintering temperature T S1 .
  By firing under such conditions, sintering can proceed from the inside to the outside of the degreased body (molded body). As a result, the binder and decomposition products remaining in the degreased body (molded body) are gradually released from the inside along with the sintering, and remain in the finally obtained sintered body. Is reliably prevented. As a result, it is possible to reliably prevent the carbon content of the sintered body from significantly increasing as compared with the carbon contents of the first powder and the second powder.
Note that the atmosphere in which the firing process is performed may change during the process. For example, a reduced-pressure atmosphere may be set first, and an inert atmosphere may be switched on the way.
Moreover, you may perform a baking process in 2 steps or more. Thereby, the efficiency of sintering improves and it can sinter by shorter sintering time.
Moreover, it is preferable to perform a baking process continuously with the above-mentioned degreasing process. Thereby, a degreasing process can serve as a pre-sintering process, can preheat a degreased body, and can sinter a degreased body more certainly.
The sintered body thus obtained is firmly joined to the main body portion obtained by sintering the second powder so as to cover the surface of the main body portion, and the first powder is sintered. This is a composite sintered body composed of a coating layer.
According to such a sintered body, for example, a metal powder having excellent corrosion resistance is used as the first powder, and a metal powder having excellent mechanical characteristics and electromagnetic characteristics is used as the second powder. It is possible to easily obtain a metal part having excellent characteristics and electromagnetic characteristics and excellent corrosion resistance.
If necessary, the following step [9B] may be performed on the composite molded body 7 obtained in the step [8] instead of the steps [9A] to [10A].
[9B] By heating the obtained composite molded body 7, the binder is solidified to obtain a compacted body (pressed body).
When this step is performed, a thermosetting binder is used instead of the above-described binder.
Examples of the thermosetting binder include organic binders such as silicone resins, epoxy resins, phenol resins, polyamide resins, polyimide resins, polyphenylene sulfide resins, magnesium phosphate, calcium phosphate, zinc phosphate, phosphorus Examples thereof include inorganic binders such as phosphates such as manganese acid and cadmium phosphate, and silicates (water glass) such as sodium silicate, and thermosetting polyimide or epoxy resin is particularly preferable. These resin materials are easily cured by being heated and have excellent heat resistance. Therefore, it is possible to improve the ease of manufacturing and heat resistance of the green compact.
Moreover, although the heating temperature at the time of heating the composite molded body 7 is slightly different depending on the composition of the binder, for example, when the binder is composed of an organic binder, it is preferably about 100 to 250 ° C., more preferably Is about 120-200 ° C.
Moreover, although heating time changes with heating temperature, it is set as about 0.5 to 5 hours.
The green compact thus obtained is formed by firmly adhering the main body portion 72 formed by binding the second powder with the binder so as to cover the surface of the main body portion 72. It becomes a composite molded body composed of a coating layer 71 formed by binding powder with a binder.
According to such a green compact, for example, a metal powder having excellent corrosion resistance is used as the first powder, and a metal powder having excellent magnetic properties is used as the second powder, so that the magnetic properties are excellent, and A dust core excellent in corrosion resistance can be easily obtained.
The composite molded body 7 obtained by the step [8] is a composite molded body having two layers of a main body 72 and a covering layer 71. According to the method for manufacturing a molded body of the present invention, the main body A composite molded body having three layers of an intermediate portion and a covering layer can be produced in the same manner.
For example, when manufacturing a composite molded body having three layers of a main body portion, an intermediate portion, and a coating layer, first, in the same manner as in the step [4], the first structure having magnetism is used as the powder constituting the coating layer. A granular powder is prepared and adsorbed on the inner wall surface of the cavity.
Next, in the same manner as in the above step [4], a third granulated powder having magnetism is prepared as a powder constituting the intermediate portion, and the first granulated powder adsorbing this on the inner wall surface of the cavity Adsorb inside.
Next, in the same manner as in the above step [6], a second granulated powder is prepared as a powder constituting the main body, and this is supplied to the cavity and filled.
If it carries out as mentioned above, the composite molded object which has three layers can be manufactured. A composite molded body having four or more layers can also be produced in the same manner.
Thus, the green compact produced by the method for producing a molded article of the present invention and the sintered compact produced by the method for producing a sintered compact of the present invention can be applied to various parts, etc. For example, it is suitably applied to a magnetic core provided in various magnetic elements (electromagnetic components) such as a choke coil, an inductor, a noise filter, a reactor, a motor, and a generator.
Hereinafter, two types of choke coils will be described as representative examples of magnetic elements having such a magnetic core.
First, a toroidal choke coil will be described.
FIG. 7 is a schematic diagram (plan view) showing a toroidal-shaped choke coil.
A choke coil 80 shown in FIG. 7 has a ring-shaped (toroidal-shaped) magnetic core 81 and a conductive wire 82 wound around the magnetic core 81. Such a choke coil 80 is generally called a toroidal coil.
The magnetic core 81 is constituted by a compacted body manufactured by the above-described method for manufacturing a molded body and a sintered body manufactured by the above-described method for manufacturing a sintered body.
Such a magnetic core 81 has different characteristics (mechanical characteristics, chemical characteristics, and electromagnetic characteristics) between the coating layer and the main body portion by appropriately setting the constituent materials of the coating layer and the main body portion. Can be made. As a result, the magnetic core 81 is excellent in functionality.
Therefore, for example, the magnetic core 81 having high magnetic permeability and high corrosion resistance can be obtained by forming the coating layer from a material having higher corrosion resistance than the main body portion and forming the main body portion from a material having high magnetic permeability.
On the other hand, examples of the constituent material of the conductive wire 82 include materials having high conductivity, such as metal materials such as Cu, Al, Ag, Au, and Ni, or alloys containing such metal materials.
In addition, it is preferable to provide the surface of the conducting wire 82 with a surface layer having insulating properties. Thereby, the short circuit with the powder magnetic core 81 and the conducting wire 82 can be prevented reliably.
Examples of the constituent material of the surface layer include various resin materials.
Next, a choke coil in which a coil is molded in a magnetic core will be described.
FIG. 8 is a schematic view (perspective view) showing a choke coil in which a coil is molded in a magnetic core.
A choke coil 90 shown in FIG. 8 is obtained by embedding a conductive wire 92 formed in a coil shape in a magnetic core 91. That is, the choke coil 90 is formed by molding a conducting wire 92 with a magnetic core 91.
A relatively small choke coil 90 having such a configuration can be easily obtained.
Further, since the conducting wire 92 is embedded in the magnetic core 91, it is difficult for a gap to be formed between the conducting wire 92 and the magnetic core 91. For this reason, the vibration by the magnetostriction of the magnetic core 91 can be suppressed and generation | occurrence | production of the noise accompanying this vibration can also be suppressed.
In addition, the conducting wire 92 can use the thing similar to the above-mentioned conducting wire 82. FIG.
Second Embodiment
Next, 2nd Embodiment of the manufacturing method of the molded object of this invention, a shaping | molding apparatus, and the manufacturing method of a sintered compact is described.
FIG. 9 and FIG. 10 are views (longitudinal sectional views) for explaining a method for producing a molded body according to the second embodiment.
Hereinafter, a method for manufacturing a molded body and a molding apparatus according to the second embodiment will be described, but differences from the method for manufacturing the molded body and the molding apparatus according to the first embodiment will be mainly described, and similar matters will be described. The description is omitted.
FIG. 9A is a diagram corresponding to FIG. 5D corresponding to step [4] in the first embodiment.
  In the molding apparatus 1 according to the present embodiment, as shown in FIG. 9A, the coil 63 is omitted from the molding apparatus 1 according to the first embodiment. For this reason, in the step [4], the first granulated powder 51 is not adsorbed on the lower surface of the upper punch 14. In addition, the shaping | molding apparatus 1 concerning this embodiment has the vibration apparatus 128 which vibrates the die | dye 12 on the die | dye 12, as shown to Fig.9 (a).
Next, as shown in FIG. 9B, the first granulated powder 51 in the feeder box 161 is taken out and replaced with the second granulated powder 52.
Next, as shown in FIG. 9C, the feeder box 161 is moved to the left until it reaches the upper side of the cavity 15 with the voltage applied to the coils 61 and 62. As a result, as shown in FIG. 10D, the second granulated powder 52 in the feeder box 161 is supplied to the cavity 15 and filled.
Next, after the feeder box 161 is returned to its original position, the die 12 is vibrated by the vibration device 128. Thereby, the density of the 1st granulated powder 51 and the 2nd granulated powder 52 with which it filled in the cavity 15 is raised, and the volume is reduced.
Next, the second granulated powder 52 in the feeder box 161 is taken out and replaced with the first granulated powder 51 again. Then, as shown in FIG. 10 (e), the feeder box 161 is moved to the left until it reaches above the cavity 15. As a result, as shown in FIG. 10 (f), the first granulated powder 51 in the feeder box 161 is supplied to and filled in the cavity 15.
Next, the composite molded body 7 is obtained in the cavity 15 by bringing the mold 10 into a closed state.
The same operations and effects as those of the first embodiment can also be obtained by the method for manufacturing a molded body and the molding apparatus as described above.
As mentioned above, although the manufacturing method of the molded object of this invention, the shaping | molding apparatus, and the manufacturing method of the sintered compact were demonstrated based on suitable embodiment, this invention is not limited to this.
Moreover, in the manufacturing method of the molded object and the manufacturing method of a sintered compact concerning the said embodiment, arbitrary processes can also be added as needed.
It is a longitudinal cross-sectional view which shows the mold closing state of 1st Embodiment of the shaping | molding apparatus of this invention. It is a longitudinal cross-sectional view which shows the mold opening state of 1st Embodiment of the shaping | molding apparatus of this invention. It is a longitudinal cross-sectional view which shows typically the molded object manufactured by the manufacturing method of the molded object of this invention. It is a figure (longitudinal sectional view) for demonstrating the manufacturing method of the molded object concerning 1st Embodiment. It is a figure (longitudinal sectional view) for demonstrating the manufacturing method of the molded object concerning 1st Embodiment. It is a figure (longitudinal sectional view) for demonstrating the manufacturing method of the molded object concerning 1st Embodiment. It is a schematic diagram (plan view) showing a toroidal-shaped choke coil. It is a schematic diagram (perspective view) showing a choke coil in which a coil is molded in a magnetic core. It is a figure (longitudinal sectional view) for demonstrating the manufacturing method of the molded object concerning 2nd Embodiment. It is a figure (longitudinal sectional view) for demonstrating the manufacturing method of the molded object concerning 2nd Embodiment.
Explanation of symbols
  DESCRIPTION OF SYMBOLS 1 ... Molding device 2 ... Frame 3 ... Punch fixing table 31 ... Through hole 4 ... Plate 41 ... Through hole 5 ... Powder 51 ... First granulated powder 52 ... Second granulation Powder 10 ... Mold 11 ... Through hole 12 ... Die 121, 122 ... Die set 123 ... Guide post 124 ... Die set connecting plate 125 ... Cylinder rod 126 ... Lower hydraulic cylinder 127 ... Guide post 128 …… Vibration device 13 …… Lower punch 131 …… Base plate 132 …… Support column 133 …… Through hole 14 …… Upper punch 141 …… Upper punch plate 142 …… Cylinder rod 143 …… Upper hydraulic cylinder 144 …… Through Hole 15 …… Cavity 16 …… Powder supply part 161 …… Feeder box 162 …… Hydraulic cylinder 163… ... Cylinder rod 61, 62, 63 ... Coil 610, 620, 630 ... Power supply circuit 7 ... Composite molded body 71 ... Cover layer 72 ... Body 80, 90 ... Choke coil 81, 91 ... Magnetic core 82 , 92 ... Lead wire

Claims (15)

  1. Supplying a first composition containing a first powder and a binder into a cavity of a mold, and disposing the first composition along an inner wall surface of the cavity;
    A second step of supplying a second composition containing a second powder and a binder different from the first powder inside the first composition disposed along the inner wall surface;
    A third step of simultaneously press-molding the first composition and the second composition supplied into the cavity;
    A main body composed of a pressure-molded body of the second powder, and a coating layer formed so as to cover the outer surface of the main body and composed of the pressure-molded body of the first powder. A method for producing a molded body, comprising producing a composite molded body.
  2.   The said 1st powder is comprised with the magnetic material, The said 1st composition is arrange | positioned along the inner wall face of the said cavity by the magnetizing effect | action of the said 1st powder by a magnetic field. A method for producing a molded article.
  3.   The method for producing a molded body according to claim 1 or 2, wherein the first powder is superior in corrosion resistance to the second powder.
  4.   The said 1st powder is a manufacturing method of the molded object in any one of Claim 1 thru | or 3 which contains at least 1 sort (s) of Al, Si, Cr, and Ti as the structural component.
  5.   The method for producing a molded body according to any one of claims 1 to 4, wherein the first composition is a granulated powder obtained by mixing and granulating the first powder and a binder in the cavity. .
  6.   The method for producing a molded body according to any one of claims 1 to 5, wherein the first powder and the second powder contain a common metal element as a constituent component.
  7. As the binder, a thermosetting binder is used,
    The method for producing a molded body according to any one of claims 1 to 6, further comprising a step of solidifying the binder after the third step.
  8. A mold having a cavity;
    A powder supply means for supplying a first powder made of a magnetic material and a second powder of a different type from the first powder into the cavity;
    Magnetic field applying means for applying a magnetic field in the cavity so that the first powder supplied into the cavity is adsorbed on the inner wall surface of the cavity;
    The first powder is supplied into the cavity, and a magnetic field is applied in the cavity to adsorb the first powder on the inner wall surface, and then the second powder is supplied into the cavity. A main body portion formed of the second powder molded body, and a coating layer formed of the first powder molded body so as to cover an outer surface of the main body portion. A molding apparatus configured to produce a composite molded body having
  9.   The molding apparatus according to claim 8, wherein the magnetic field application unit includes a coil provided in the vicinity of the cavity and a power supply circuit that applies a voltage to the coil.
  10. The mold includes a die that forms a side surface of the cavity;
    A lower punch that constitutes the lower surface of the cavity and is movable relative to the die;
    An upper punch that constitutes the upper surface of the cavity and is movable relative to the die;
    The molding apparatus according to claim 9, wherein the coil is provided so as to surround the die, the lower punch, and the upper punch.
  11.   The molding apparatus according to claim 10, wherein each of the die, the lower punch, and the upper punch is made of a soft magnetic material.
  12. A step of firing the molded body manufactured by the method for manufacturing a molded body according to any one of claims 1 to 7,
    Composite firing comprising a main body portion made of a sintered body of the second powder and a coating layer formed to cover the outer surface of the main body portion and made of the sintered body of the first powder. A method for producing a sintered body, which comprises producing a bonded body.
  13.   The method for producing a sintered body according to claim 12, wherein an average particle diameter of the first powder is larger than an average particle diameter of the second powder.
  14. 14. The method for manufacturing a sintered body according to claim 12, wherein a sintering temperature T S1 of the first powder is higher than a sintering temperature T S2 of the second powder.
  15. The firing condition for firing the molded body is that the molded body is heated at a temperature equal to or higher than the sintering temperature T S2 and lower than the sintering temperature T S1 to selectively sinter the second powder. The method for producing a sintered body according to claim 14, wherein the first powder is heated under a temperature equal to or higher than the sintering temperature T S1 after sintering.
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CN103158197A (en) * 2011-12-27 2013-06-19 北京仁创科技集团有限公司 Molding system of composite structural brick
CN103171045A (en) * 2011-12-27 2013-06-26 北京仁创科技集团有限公司 Forming process of brick in composite structure
CN103660012A (en) * 2013-11-18 2014-03-26 宜兴市明月建陶有限公司 Dry powder tile manufacturing system and method
CN105312574A (en) * 2014-07-08 2016-02-10 丰田自动车株式会社 Manufacturing method for sintered compact
CN106696068A (en) * 2015-07-23 2017-05-24 佛山市东鹏陶瓷有限公司 Distributing system for ceramic tile with surrounding edge structure and distributing method thereof

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JP2013021020A (en) * 2011-07-07 2013-01-31 Mitsubishi Electric Corp Separation recovery method of rare-earth magnet, manufacturing method of rare-earth magnet, and manufacturing method of rotary electric machine
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CN105312574A (en) * 2014-07-08 2016-02-10 丰田自动车株式会社 Manufacturing method for sintered compact
CN106696068A (en) * 2015-07-23 2017-05-24 佛山市东鹏陶瓷有限公司 Distributing system for ceramic tile with surrounding edge structure and distributing method thereof
CN106696068B (en) * 2015-07-23 2019-01-04 佛山市东鹏陶瓷有限公司 A kind of cloth system and its distributing method with surrounding edge structural ceramics brick

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