JP2019018434A - Method for producing compact of ceramic powder - Google Patents

Abstract

To provide a method for producing a compact of a ceramic powder in which a density difference hardly occurs in the compact when producing the compact having different thicknesses using the ceramic powder.SOLUTION: In a method of producing a compact 1, first to fourth partial molds 15 to 21 laminated in the press direction as a mold 13 are used. The first to fourth partial molds 15 to 21 respectively have first to fourth partial spaces 23 to 29 constituting a part of an internal space 11. Then, a partial space 23 in a first partial mold 15 is filled with a raw material containing a ceramic powder and pressed. Further, a second partial mold 17 adjacent to the first partial mold 15 in the pressing direction is arranged on the first partial mold 15 pressed with the raw material. In addition, the second partial space 23 in the second partial mold 17 is filled with the raw material and pressed. Thereafter, in the same manner, a third partial space 27 of a third partial mold 19 and a fourth partial space 29 of a fourth partial mold 21 are sequentially filled with the raw material and pressed.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a method for producing a molded body of ceramic powder, in which a ceramic powder is used and pressure is applied in a predetermined direction (that is, by pressing) to produce the molded body.

Conventionally, as a method for producing a molded body using ceramic powder, various production methods such as mechanical press molding, isostatic pressing, cast molding, extrusion molding, and injection molding are known.
Among these, in mechanical press molding, ceramic powder is filled into the inner space of a mold (specifically, an outer mold), and the filled ceramic powder (that is, the filled powder) is uniaxially pressed by upper and lower punches, thereby forming an inner portion. This is a method for producing a space-shaped molded body (see, for example, Patent Documents 1 to 4).

JP-A-6-224557 JP-A 61-169211 JP-A-4-229205 JP 2008-272780 A

By the way, the above-described conventional technology has the following problems, and improvements have been demanded.
Specifically, as shown in FIG. 8, the force (that is, the pressed force) applied to the filling powder P6 in the internal space P5 of the mold P4 by the upper and lower punches P2, P3 surrounded by the outer mold P1 is as follows. In the surface of the filling powder P6 (upper surface in FIG. 8), it is evenly applied to the unit area. Therefore, in the case of producing molded bodies having different thicknesses in the pressing direction, it is said that the ceramic powder is not easily tightened (that is, difficult to be compressed) in the thick part (D2) with respect to the thin part (D1). There was a problem.

Further, when pressing powder, according to Janssen's law, as the depth in the pressing direction increases, a force is applied to the side wall of the internal space of the mold, and the powder may not be sufficiently compressed.
As described above, when producing molded bodies having different thicknesses in the press direction, the compressed state of the filling powder is different in the portions having different thicknesses, so that a density difference may occur in the portions having different thicknesses of the molded body. .

  And when such a density difference generate | occur | produced, when taking out a molded object from a metal mold | die or baking, a crack might generate | occur | produced in the molded object. Moreover, excessive shrinkage | contraction generate | occur | produced in the molded object at the time of baking, and the target dimension might not be obtained. That is, there is a problem that it is not easy to control dimensions during firing.

  The present disclosure has been made in view of the above problems, and the purpose thereof is to produce a molded body of ceramic powder that is less likely to cause a density difference in the molded body when the molded body having different thicknesses is manufactured using ceramic powder. It is to provide a method.

(1) A first aspect of the present disclosure uses a mold having an internal space shaped to match the shape of a molded body to be produced, fills the internal space of the mold with ceramic powder, and presses the ceramic powder in a predetermined pressing direction. The present invention relates to a method for producing a molded body of a ceramic powder, which is pressed to produce a molded body.

  In this method for producing a ceramic powder molded body, the molded body is a molded body having different thicknesses in the pressing direction, and the mold is composed of a plurality of partial molds stacked in the pressing direction. The partial molds each have a partial space that constitutes a part of the internal space.

  Then, as a process of manufacturing a molded body using a mold, a first process of filling ceramic powder in a partial space in one partial mold and pressing in a pressing direction, and a partial mold in which the ceramic powder is pressed A second step of placing another partial mold, which is a partial mold adjacent to the partial mold in the pressing direction, on the mold, and filling a partial space in the other partial mold with ceramic powder, A third step of pressing in the pressing direction.

  Thus, in the first aspect, a plurality of partial molds stacked in the press direction are used as the mold. In addition, each partial mold has a partial space that constitutes a part of the internal space of the mold (that is, the space in the shape of the molded body).

  In the first step, the ceramic powder is filled in a partial space in one partial mold and pressed in the pressing direction. In the second step, the partial mold is placed on the partial mold in which the ceramic powder is pressed. Another partial die that is a partial die adjacent to the die in the pressing direction is arranged, and in the third step, the ceramic powder is filled in the partial space in the other partial die and pressed in the pressing direction.

  Thereby, even when manufacturing a molded body having a different thickness in the pressing direction, the ceramic powder filled in the inner space of the mold (that is, a space having the same shape as the molded body) is not pressed at once in the pressing direction. It can press sequentially for every ceramic powder in each partial space of each partial metal mold | die. That is, it can be pressed, for example, at the same pressure so that each ceramic powder is in a similar compressed state by the thickness of each partial space in the pressing direction. Therefore, since the compression degree of the part from which thickness differs in the target molded object can be arrange | equalized, the density difference of the part from which thickness differs can be reduced.

  As a result, it is possible to suppress the occurrence of cracks in the molded body when the molded body is removed from the mold or fired. In addition, it is possible to suppress the occurrence of a problem that a target dimension cannot be obtained due to excessive shrinkage in the molded body during firing (that is, the problem that the dimensions cannot be easily controlled during firing).

  Conventionally, when manufacturing a molded product having a different thickness in the pressing direction, a ceramic powder for weighing is filled on the lower punch surrounded by the outer mold, and when the upper punch is pressed, The ceramic powder was raised to fill the internal space in the upper punch.

However, in this case, even when the upper punch is lowered, the ceramic powder is not supplied up to a place where the internal space of the upper punch is high, and a molded article having a target shape may not be obtained.
On the other hand, in the first aspect, since the operation of pressing each ceramic powder filled in each partial space of each partial mold is repeated, the ceramics are sufficiently contained in each partial space of each partial mold. Powder can be filled. Therefore, there is an advantage that a molded body having a target shape can be easily obtained even when a molded body having a different thickness in the pressing direction is manufactured.

(2) In the second aspect of the present disclosure, the thickness in the pressing direction of the partial space in one partial mold may be substantially the same as the thickness in the pressing direction of the partial space in the other partial mold.
As in the second aspect, the thickness in the pressing direction of the partial space in one partial mold and the thickness in the pressing direction of the partial space in the other partial mold are made substantially equal to each other. In each partial space of the mold, the state in which the ceramic powder is compressed can be made substantially uniform. Thereby, there is an effect that the density difference in the molded body can be reduced.

In addition, the said substantially uniform has shown the difference of the thickness of the partial space of a partial metal mold | die 10% or less with respect to the partial space with large thickness.
(3) In the third aspect of the present disclosure, the thickness of each partial space in each partial mold in the press direction may be the same as the thickness of the thinnest portion in the press direction of the molded body.

  As in the third aspect, by setting the thickness in the pressing direction of each partial space in each partial mold to the same thickness as the thickness of the thinnest part in the pressing direction of the molded body, In the partial space, the state of compressing the ceramic powder can be made more uniform. Thereby, the density difference in the molded body can be further reduced.

(4) In the fourth aspect of the present disclosure, the outer shape of the molded body may have a surface inclined obliquely with respect to the pressing direction.
In the present disclosure, as in the fourth aspect, the density difference between the molded bodies is similar to each of the above-described aspects even with respect to a molded body having a surface whose outer shape is inclined obliquely with respect to the press direction. There is an effect of reducing. In addition, it is possible to suppress cracking at the time of taking out from the mold or firing, and to easily perform dimensional control during firing.

<Each configuration of the present disclosure will be described below>
-For example, the metal mold | die may be comprised from the 3 or more partial metal mold | die. In this case, when the partial dies are sequentially laminated, the molded body may be manufactured by repeatedly filling the partial spaces with ceramic powder and sequentially pressing in the pressing direction.

  -Moreover, as a punch which presses the ceramic powder with which each partial space of each partial metal mold | die was pressed, the punch of the shape matched with the shape of the opening part which each partial space of each partial metal mold | die can be used.

Further, one or more of the partial dies may be constituted by a plurality of divided dies that are divided in a direction perpendicular to the pressing direction.
-As a raw material containing the ceramic powder used in order to form a molded object, a sintering aid, a binder, etc. other than a ceramic powder are mentioned. The main component in this raw material is ceramic (and hence ceramic powder). The main component means that the content exceeds 50% by volume. As content with respect to the raw material of this ceramic powder, the range of 95 volume% or more is employable, for example.

  -Moreover, the baked product which is a sintered compact (ceramic sintered body) can be obtained by baking a molded object. Here, the ceramic sintered body is a sintered body containing ceramic as a main component (greater than 50% by volume), and the content of the ceramic in the sintered body is preferably 95% by volume or more. Moreover, less than 5 volume% can be employ | adopted as a sintering auxiliary agent.

・ Alumina or zirconia can be used as the ceramic. In addition to ceramics, for example, a sintering aid such as silica or a glass component may be included.
As the material of the mold (that is, the partial mold), for example, various known steel materials such as SKD11 can be used.

It is a perspective view which shows the molded object of 1st Embodiment. It is a perspective view which shows a part of manufacturing method of the molded object of 1st Embodiment. It is a perspective view which shows a part of manufacturing method of the molded object of 1st Embodiment. (A) is a perspective view showing a first partial mold, (b) is a perspective view showing a second or third partial mold, and (c) is a perspective view showing a fourth partial mold. (A) is a front view which shows the molded object of 2nd Embodiment, (b) is a top view which shows the 1st partial metal mold | die of 2nd Embodiment. It is a perspective view which shows a part of manufacturing method of the molded object of 2nd Embodiment. It is a perspective view which shows a part of manufacturing method of the molded object of 2nd Embodiment. It is explanatory drawing of a prior art.

Next, an embodiment of a method for producing a ceramic powder compact of the present disclosure will be described.
[1. First Embodiment]
[1-1. Structure of ceramic powder compact]
First, the ceramic powder compact in the first embodiment will be described.

  As shown in FIG. 1, a ceramic powder compact 1 (hereinafter sometimes simply referred to as a compact) 1 includes a plate-like flat plate portion 3 having a rectangular shape in plan view (as viewed from above in FIG. 3). A pair of plate-like first leg portions 5 and second leg portions 7 that protrude from both ends of the flat plate portion 3 in the left-right direction (left-right direction in FIG. 3) are provided.

Both the leg portions 5 and 7 are parallel and project perpendicularly to the flat plate portion 3 in the same direction (downward in FIG. 3). Accordingly, the shape of the molded body 1 viewed from the paper surface direction of FIG. 3 is a so-called U-shape.
That is, the molded body 1 is a molded body having different thicknesses in the press direction (the vertical direction in FIG. 3) described later. Specifically, the molded body 1 has a shape having a portion in which the thickness in the press direction varies depending on the location in the planar direction (that is, the portions of the leg portions 5 and 7) in a plan view.

As will be described later, the molded body 1 becomes a sintered body (that is, a ceramic sintered body: not shown) after firing, and is made of a raw material containing alumina powder having a particle size of 1 μm or less.
Specifically, the raw material contains 99 volume% or more (for example, 99 volume%) of alumina as a ceramic component in the solid component constituting the sintered body after firing, and includes a sintering aid such as silica as the balance. It is out.

  In addition to the solid component, the raw material contains, for example, an organic binder such as PVA in the range of 3% by weight or less (for example, 3% by weight) in terms of outer weight%. This organic binder is added to facilitate the formation of the ceramic powder and is burned off by firing.

[1-2. Method for producing molded body]
Next, the manufacturing method of the molded object 1 is demonstrated based on FIGS.
The manufacturing method of the molded body 1 of the first embodiment uses a mold 13 having an internal space 11 having the same shape as the shape of the molded body 1 to be manufactured, as shown in FIG.

  The mold 13 includes a plurality of partial molds (first to fourth partial molds) 15, 17, 19, and 21 that are stacked in the pressing direction. Moreover, each partial mold 15-21 has each partial space (1st-4th partial space) 23, 25, 27, 29 which comprises a part of internal space 11, respectively.

Details will be described below.
<Raw material production process: preparation process>
As a raw material powder, an alumina powder having a particle size of 1 μm or less and a powder of, for example, silica sintering aid having a particle size of 1 μm or less were prepared. Moreover, PVA etc. were prepared as an organic binder.

Then, the alumina powder and the sintering aid powder were weighed and introduced into an alumina pot so that the volume ratio was 99: 1 and the total amount was 20 g.
The organic binder was weighed to 3% by weight with respect to the solid component powder of the alumina powder and the sintering aid powder, and charged into the pot.

In this pot, alumina powder, sintering aid powder, and organic binder were mixed to obtain a raw material for producing a molded body.
<Pressing process: 1st process>
Next, as shown in FIG. 2A, a plate-like first partial mold 15 having a rectangular shape in plan view was prepared.

  As shown in FIG. 4A, the first partial mold 15 is a pair of first grooves which are a pair of grooves parallel to one surface (upper surface) 15a in the thickness direction (vertical direction in FIG. 2). A partial space 23 is formed. The first partial space 23 is a space having a shape similar to the shape of the tips of both leg portions 5 and 7 of the molded body 1.

  Here, the depth (thickness in the pressing direction) of the first partial space 23 is obtained by dividing the thickness in the pressing direction of the internal space 11 having the same shape as the molded body 1 as shown in FIG. Is. Specifically, the thickness of the first partial space 23 is the same as the thickness of the thinnest portion (that is, the fourth partial space 29) in the pressing direction of the molded body 1 (and hence the internal space 11).

As will be described later, the thickness of the second and third partial spaces 25 and 27 in the pressing direction is also the same as the thickness of the first and fourth partial spaces 23 and 29 in the pressing direction.
Next, as shown in FIG. 2B, the raw material is filled into the first partial space 23 of the first partial mold 15.

  Next, as shown in FIG. 2 (c), using the press member 31 having a shape that matches the shape of the opening 23 a of the first partial space 23 of the first partial mold 15, The raw material is pressed (pressed) at a predetermined pressure and compressed.

  The pressing member 31 includes a pair of legs 35 having a lower surface that coincides with the planar shape of the opening 23a on one main surface (the main surface below FIG. 2C) of the flat plate 33. The raw material in the pair of first partial spaces 23 is compressed by the pair of leg portions 35.

In addition, as will be described later, the pressure for pressing the raw materials in the partial spaces 23 to 29 is the same.
<Die stacking process: Second process>
Next, as shown in FIGS. 2D and 2E, after the pressing member 31 is removed from the first partial mold 15, the scraper 37 or the like is used to remove excess from the upper surface of the first partial mold 15. Remove the raw materials.

  Next, as shown in FIG. 3A, the second partial mold 17 is laminated on the upper surface of the first partial mold 15. At this time, the first partial mold 15 and the second partial mold 17 are stacked such that the planar shapes of the first partial space 23 and the second partial space 25 coincide in plan view.

  As shown in FIG. 4B, the second partial mold 17 is a plate member having a rectangular shape in plan view, and a pair of parallel second partial spaces 25 are formed so as to penetrate in the thickness direction. Is. Accordingly, the thickness of the second partial mold 17 is the same as the thickness of the second partial space 25 that is a through hole. The second partial space 25 is a space having a shape similar to the shape of part of both the leg portions 5 and 7 of the molded body 1.

<Refilling and repressing step: Third step>
Next, as shown in FIG. 3B, the raw material is filled into the second partial space 25 of the second partial mold 17 in the same manner as the filling of the first partial space 23.

  Next, as shown in FIG. 3C, the raw material in the second partial space 25 is pressed using the pressing member 31 in the same manner as the processing for the first partial mold 15, and then the second part Excess raw material is removed from the upper surface of the partial mold 17.

  Next, as shown in FIG. 3D, a third partial mold 19 is laminated on the upper surface of the second partial mold 17. At this time, the second partial mold 17 and the third partial mold 19 are stacked so that the planar shapes of the second partial space 25 and the third partial space 27 coincide in plan view.

The third partial mold 19 has the same shape as the second partial mold 17 as shown in FIG.
Next, the raw material is filled in the third partial space 27 of the third partial mold 19 in the same manner as in the filling of the second partial space 25.

  Next, in the same manner as the processing for the second partial mold 17, the raw material in the third partial space 27 is pressed using the pressing member 31, and then, the excess raw material is applied from the upper surface of the third partial mold 19. Remove.

  Next, as shown in FIG. 3E, the fourth partial mold 21 is laminated on the upper surface of the third partial mold 19. At this time, the third partial mold 19 and the fourth partial mold 21 are stacked such that the third partial space 27 is included in the fourth partial space 29 in plan view.

  As shown in FIG. 4C, the fourth partial mold 21 is a plate member having a rectangular shape in plan view, and a fourth partial space 29 having a rectangular shape in plan view is formed so as to penetrate in the thickness direction. It has been done. Therefore, the thickness of the fourth partial mold 21 is the same as the thickness of the fourth partial space 29 that is a through hole. The fourth partial space 29 is a space having the same shape as the shape of the flat plate portion 3 of the molded body 1.

Thereafter, although not shown, the raw material in the fourth partial space 29 is pressed and compressed using a pressing member having a lower surface similar to the planar shape of the fourth partial space 29.
As a result, the molded body 1 is formed in the mold 13 (that is, the internal space 11). Thereafter, the molded body 1 of the first embodiment is obtained by taking out the molded body 1 from the mold 13.

  Thereafter, the molded body 1 is fired to obtain a ceramic sintered body. For example, the molded body 1 is heated in the atmosphere from room temperature (for example, 25 ° C.) to 1350 ° C., and then held for 1 hour or more (for example, 2 hours), and then naturally dissipated to thereby form a ceramic sintered body. Can be obtained.

[1-3. effect]
(1) In the manufacturing method of the molded body 1 according to the first embodiment, the first to fourth partial molds 15 to 21 stacked in the press direction are used as the mold 13. The first to fourth partial molds 15 to 21 are
It has first to fourth partial spaces 23 to 29 that constitute a part of the internal space 11 (that is, the space of the shape of the molded body 1).

  Then, for example, the partial space 23 in the first partial mold 15 is filled with the raw material containing the ceramic powder and pressed in the pressing direction. Further, a second partial mold 17 adjacent to the first partial mold 15 in the pressing direction is disposed on the first partial mold 15 pressed with the raw material. Furthermore, the raw material is similarly filled in the second partial space 23 in the second partial mold 17 and pressed in the pressing direction. Thereafter, in the same manner, the third partial space 27 of the third partial mold 19 and the fourth partial space 29 of the fourth partial mold 21 are sequentially filled with raw materials and pressed.

  Thus, even when the molded body 1 having different thicknesses in the pressing direction is manufactured, not all the dimensions in the thickness direction are pressed at once, but for each raw material filled in each of the partial spaces 15 to 21, each raw material is It can press so that it may become a similar compression state. Therefore, since the degree of compression of the part from which thickness differs in the target molded object 1 can be arrange | equalized, the density difference of the part from which thickness differs can be made small.

  As a result, it is possible to suppress the occurrence of cracks in the molded body 1 when the molded body 1 is taken out from the mold 13 or fired. In addition, it is possible to suppress the occurrence of a problem that an excessive shrinkage occurs in the molded body 1 during firing and a target dimension cannot be obtained (that is, a problem that the control of the dimension is not easy during firing).

  (2) In the first embodiment, since the operation of pressing each raw material filled in each of the partial molds 15 to 21 is repeated, an unfilled region is generated in the internal space 11 as in the conventional case. Can be suppressed. That is, the raw materials can be sufficiently filled in the partial spaces 23 to 29 in the partial molds 15 to 21. Therefore, even when the molded body 1 having different thicknesses in the pressing direction is manufactured, the molded body 1 having a target shape can be easily obtained.

(3) In this 1st Embodiment, the thickness in the press direction of each partial space 23-29 in each partial mold 15-21 is the same.
Therefore, in the partial spaces 23 to 29 in the partial molds 15 to 21, the state of compressing the raw material can be made uniform. Thereby, there is an effect that the density difference in the molded body 1 can be greatly reduced.

  (4) In the first embodiment, the thickness in the pressing direction of the partial spaces 23 to 29 in the partial molds 15 to 21 is the thickness of the thinnest portion in the pressing direction of the molded body 1 (that is, the fourth partial space). 29 thickness).

  Therefore, in the partial spaces 23 to 29 in the partial molds 15 to 21, the state of compressing the raw material can be made more uniform. Thereby, the density difference in the molded body 1 can be further reduced.

[1-4. Correspondence of wording]
Here, the correspondence of the words in the claims and the embodiment will be described.
The molded body 1, the internal space 11, the mold 13, the partial molds 15, 16, 17, 19 and the partial spaces 23, 25, 27, and 29 of the first embodiment are respectively disclosed in the present disclosure. It corresponds to an example of a molded body, an internal space, a mold, a partial mold, and a partial space.

[2. Second Embodiment]
Next, the second embodiment will be described, but the description of the same contents as the first embodiment will be omitted or simplified.

In this 2nd Embodiment, the shape of a molded object differs from 1st Embodiment.
[2-1. Shape of molded body]
As shown in FIG. 5A, the molded body 41 in the second embodiment includes a flat plate portion 43 similar to that in the first embodiment, and the left-right direction of the flat plate portion 3 (left-right direction in FIG. 5A). A pair of first leg portions 45 and second leg portions 47 projecting downward from both ends of the figure.

  These leg portions 45 and 47 are not parallel, but are inclined with respect to the flat plate portion 43 and the pressing direction (vertical direction in FIG. 5A) so that the gap increases toward the lower end side in FIG. 5A. Yes. That is, both the leg portions 45 and 47 have surfaces inclined with respect to the pressing direction.

[2-2. Method for producing molded body]
Next, the manufacturing method of the molded body of the second embodiment will be described.
In the second embodiment, the mold 51 (thus, the first to fourth partial molds 53 to 59: see FIG. 7E) can be divided in the vertical direction of FIG. 5B. ing. That is, the mold 51 is a split mold that can be divided in the vertical direction with respect to the vertical direction (press direction) in FIG. 5A and the left-right direction in FIG.

<Pressing process: 1st process>
First, as shown in FIG. 6A, a first partial mold 53 is prepared.
As shown in FIG. 5B, the first partial mold 53 has a pair of first partial spaces 61 that are a pair of parallel grooves formed on one surface (upper surface) 15a in the thickness direction. Is. Note that the first partial space 61 is a space having a shape similar to the shape of the tips of the both leg portions 45 and 47 of the molded body 41, and is inclined with respect to the pressing direction (vertical direction in FIG. 6A). ing.

Next, as shown in FIG. 6B, the raw material (G) is filled into the first partial space 61 of the first partial mold 53.
Next, as shown in FIG. 6C, the raw material in the first partial space 61 is pressed using a pressing member 71.

<Die stacking process: Second process>
Next, as shown in FIG. 6D and FIG. 6E, after removing the pressing member 71 from the first partial mold 53, excess raw material is removed from the upper surface of the first partial mold 53.

  Next, as shown in FIG. 7A, the second partial mold 55 is laminated on the upper surface of the first partial mold 53. The second partial mold 55 is formed with a pair of second partial spaces 63 that are a pair of inclined through holes that coincide with the shapes of the inclined leg portions 45 and 47.

<Refilling and repressing step: Third step>
Next, as shown in FIG. 7B, the raw material is filled into the second partial space 63 of the second partial mold 55.

Next, as shown in FIG. 7C, the raw material in the second partial space 63 is pressed using a pressing member (not shown), and then the excessive raw material is removed from the upper surface of the second partial mold 55.
Next, as shown in FIG. 7D, the third partial mold 57 is laminated on the upper surface of the second partial mold 55. The third partial mold 57 is formed with a pair of third partial spaces 65 that are a pair of inclined through holes that match the shapes of the inclined leg portions 45 and 47.

Next, the raw material is filled in the third partial space 27 of the third partial mold 57.
Next, the raw material in the third partial space 65 is pressed using a pressing member (not shown), and then the excess raw material is removed from the upper surface of the third partial mold 57.

Next, as shown in FIG. 7E, a fourth partial mold 59 is laminated on the upper surface of the third partial mold 57.
Then, the raw material in the 4th partial space 67 is pressed using the press member which is not shown in figure.

  Thus, the molded body 41 is formed in the mold 51 (that is, the internal space 69). Thereafter, the molded body 41 of the second embodiment is obtained by dividing the mold 51 and taking out the molded body 41. can get.

In this 2nd Embodiment, although both the leg parts 45 and 47 of the molded object 41 incline with respect to the press direction, there exists an effect similar to 1st Embodiment.
In particular, each raw material is substantially the same for each raw material filled in each of the partial spaces 61, 63, 65, and 67, as compared with a case where all the dimensions in the thickness direction are pressed at once with respect to the raw material in the mold 51. Can be pressed to achieve a proper compression state. Therefore, in the target molded body 41, the degree of compression of the portions having different thicknesses can be made uniform, so that the density difference between the portions having different thicknesses can be reduced.

[3. Other Embodiments]
As mentioned above, although embodiment of this indication was described, this indication is not limited to the above-mentioned embodiment, and can be carried out in various modes in the range which does not deviate from the gist of this indication.

(1) For example, the shape of the molded body is not limited to the above embodiment, and various molded bodies having different thicknesses in the press direction can be employed.
(2) The thickness of each partial space does not need to be the same. Moreover, the thickness of each partial space does not need to be the same as the thickness of the thinnest part in the press direction of a molded object (hence internal space).

(3) The number and shape of the partial molds constituting the mold are not limited to the above embodiment, and for example, 3 or less or 4 or more partial molds can be adopted.
(4) About a raw material and a ceramic powder, various compositions are employable, without being limited to the composition of the said embodiment.

  (5) In addition, the function which one component in each said embodiment has may be shared by a some component, or the function which a some component has may be exhibited by one component. Moreover, you may abbreviate | omit a part of structure of each said embodiment. In addition, at least a part of the configuration of each of the above embodiments may be added to or replaced with the configuration of another embodiment. In addition, all the aspects included in the technical idea specified from the wording described in the claims are embodiments of the present disclosure.

DESCRIPTION OF SYMBOLS 1, 41 ... Molded object 11, 69 ... Internal space 13, 51 ... Mold 15, 16, 17, 19, 53, 55, 57, 59 ... Partial mold 23, 25, 27, 29, 61, 63, 65 , 67 ... Partial space

Claims (4)

Using a mold having an internal space shaped to match the shape of the molded body to be produced, the ceramic powder is filled into the internal space of the mold, and the ceramic powder is pressed in a predetermined pressing direction to produce a molded body. In the method for producing a ceramic powder molded body,
The molded body is a molded body having different thicknesses in the pressing direction,
The mold is composed of a plurality of partial molds stacked in the pressing direction, and each partial mold has a partial space that constitutes a part of the internal space,
As a step of producing the molded body using the mold,
A first step of filling the partial space in one partial mold with the ceramic powder and pressing in the pressing direction;
A second step of disposing another partial mold, which is the partial mold adjacent to the partial mold in the pressing direction, on the partial mold on which the ceramic powder is pressed;
A third step of filling the partial space in the other partial mold with the ceramic powder and pressing in the pressing direction;
Having
A method for producing a molded body of ceramic powder. The thickness in the pressing direction of the partial space in one partial mold and the thickness in the pressing direction of the partial space in the other partial mold were substantially the same,
The manufacturing method of the molded object of the ceramic powder of Claim 1. The thickness in the press direction of each partial space in each partial mold is the same thickness as the thickness of the thinnest part in the press direction of the molded body,
The manufacturing method of the molded object of the ceramic powder of Claim 2. The outer shape of the molded body has a surface inclined obliquely with respect to the pressing direction.
The manufacturing method of the molded object of the ceramic powder of any one of Claims 1-3.

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