CN114207372A

CN114207372A - Frame for firing and jig for firing

Info

Publication number: CN114207372A
Application number: CN202080003503.8A
Authority: CN
Inventors: 古宫山常夫; 松叶浩臣
Original assignee: NGK Insulators Ltd; NGK Adrec Co Ltd
Current assignee: NGK Insulators Ltd; NGK Adrec Co Ltd
Priority date: 2019-08-16
Filing date: 2020-05-12
Publication date: 2022-03-18
Also published as: KR102476035B1; TW202108956A; TWI828927B; WO2021033375A1; JPWO2021033375A1; KR20210023996A; JP7285271B2

Abstract

A rack for firing is provided with: the frame, post portion, a plurality of surrounding portions and a plurality of secondary post portions. The frame has an opening and a flat burning plate disposed on the surface of the frame. The column portion extends between the frames so as to pass through the center of the frames. The surrounding portion is a range surrounded by the frame and the pillar portion. The sub-column portion extends from the center of each surrounding portion toward the frame body or the column portion.

Description

Frame for firing and jig for firing

Technical Field

The present specification discloses a firing rack and a firing jig. In particular, a technique relating to a baking rack for arranging a flat plate-like baking receiving plate on which an object to be baked is placed is disclosed.

Background

In a firing step of a fired object such as a ceramic product, there is known a technique of placing the fired object on a setter plate and firing the fired object. International publication No. WO2015/008503 (hereinafter referred to as patent document 1) discloses: a technique of stacking a plurality of flat plate-like setter plates on a setter for firing is adopted. The firing structure of patent document 1 is: in the opening portion formed by the frame body, a cross-shaped column portion (bridge portion) is provided to connect the frame bodies to prevent the flat plate-like setter plate from being deformed in the firing step.

Disclosure of Invention

The firing jig of patent document 1 supports the center of the flat plate-shaped setter by the column portions to prevent the deformation of the flat plate-shaped setter. However, in the case of the baking jig of patent document 1, the temperature of the flat plate-like baking plate may be different between the portion supported by the pillar portion (the portion in contact with the pillar portion) and the portion not supported by the pillar portion (the portion not in contact with the pillar portion). For example, in the temperature increasing step, the temperature of the flat setter plate may be increased in a portion not in contact with the pillar portion as compared with a portion in contact with the pillar portion. On the other hand, in the temperature lowering step, the temperature of the flat setter plate may be lowered in the portions not in contact with the pillar portions as compared with the portions in contact with the pillar portions. If temperature unevenness occurs in the surface of the flat plate-like setter, the object to be fired may be fired unevenly. An object of the present specification is to provide a baking rack capable of reducing an in-plane temperature distribution of a flat-plate-shaped baking plate placed thereon.

The firing structure disclosed in the present specification is: a flat burning board for placing a burning object is arranged. The firing rack may include: a frame body having an opening portion on a surface thereof, the frame body having a flat-plate-shaped setter plate arranged thereon; a column part extending between the frame bodies so as to pass through the center of the frame bodies; a plurality of surrounding portions formed by being surrounded by the frame body and the column portion; and a plurality of sub column portions extending from the center of the surrounding portion toward the frame body or the column portion.

The present specification also discloses a firing jig comprising: the above-mentioned frame for firing; and a flat-plate-shaped setter disposed on a surface of the setter. In the firing jig, the firing rack and the flat firing plate may be made of the same material.

Drawings

Fig. 1 is a plan view of a firing rack according to a first embodiment.

Fig. 2 is a sectional view of a firing jig using the firing rack according to the first embodiment.

Fig. 3 is a perspective view showing a state in which the firing jigs are laminated.

Fig. 4 is a plan view showing a firing rack of the second embodiment.

Fig. 5 is a plan view showing a firing rack of a third embodiment.

Fig. 6 is a plan view of a firing rack according to a fourth embodiment.

Detailed Description

Hereinafter, the technical features disclosed in the present specification are collated. In addition, each of the matters described below has technical usefulness alone.

(jig for firing)

The firing jig disclosed in the present specification is used in, for example, a firing step of a fired material such as a ceramic product. The firing jig may include: a flat-plate-shaped setter for stacking the objects to be fired, and a firing rack configured to arrange the flat-plate-shaped setter. That is, the firing jig may include: a burning rack and another flat burning board which is different from the burning rack. The flat plate-like setter and the setter for firing may be made of materials such as alumina, mullite, zirconia, silicon nitride, and silicon carbide. The flat plate-like burning receiving plate and the burning rack may be made of the same material or different materials. It is preferable that the flat plate-like setter and the setter for firing are made of the same material so that the temperature following property during firing (temperature change of the flat plate-like setter and the setter for firing accompanying temperature change of the furnace atmosphere) is good.

The material of the flat plate-like setter and/or setter for firing is particularly preferably silicon carbide. It is known that: the silicon carbide has high strength and excellent impact resistance. Therefore, if the flat plate-like setter and/or the firing setter are/is manufactured using a silicon carbide material, the flat plate-like setter and/or the firing setter can be thinned. As a result, the weight of the burning jig is reduced, and the heat capacity of the burning jig can be reduced. That is, by using a silicon carbide material as a material of the flat plate-shaped setter and/or the firing setter, a firing jig having good temperature following properties can be realized. The silicon carbide material has higher thermal conductivity than the other materials described above, and this also contributes to improvement in temperature following property. In addition, with respect to the "silicon carbide" mentioned in the present specification: substantially free of unavoidable impurities, SiC (recrystallized SiC), Si₃N₄－SiC(Si₃N₄: 20-30 wt%, SiC: 70-80 wt%), SiC containing Si (Si: 1-30 wt%, SiC: 70 to 99 wt%).

(frame for firing)

The firing frame may include: frame, post portion, surrounding part, sub-post portion and protruding portion. The frame body, the column portion, the sub-column portion, and the protruding portion may be integrally molded, or a part or all of them may be separate components, and the components may be assembled to form the baking frame. In addition, the surrounding portion is a region formed by the frame body and the pillar portion, which will be described in detail below.

The frame body may surround the outer periphery of the baking frame to form an outer edge of the baking frame. The inner side of the frame body can be opened. That is, the frame may be annular. The shape of the frame (the outer edge shape of the baking frame) may be a polygon such as a triangle or a quadrangle, or a circle. Although not particularly limited, the shape of the frame is preferably a quadrangle, and particularly preferably a square or a rectangle. In the case where the frame has a square or rectangular shape, the size of the frame (the outer edge of the baking rack) may be 100 to 500 mm. In addition, the thickness of the frame body can be 1-5 mm. The surface of the frame may constitute a part of a placement surface (setter placement surface) for placing the flat setter.

The frame may have a plurality of projections on a surface thereof. By providing the projection on the surface of the frame body, the position of the flat plate-like setter can be restricted when the flat plate-like setter is placed on the setter for firing or when the jig for firing on which the flat plate-like setter is placed is used. For example, when the firing jig is used in a continuous firing furnace, it is possible to suppress: the position of the flat burning board relative to the burning rack is shifted due to the vibration received when the burning clamp is conveyed. When the firing jigs are stacked, the protruding portions function as spacers for providing a gap between the firing jigs (between the flat plate-shaped setter and the upper firing rack). The thickness (protruding height) of the protruding portion can be appropriately adjusted according to the dimensions of the flat plate-like setter plate and the object to be fired. For example, the thickness of the flat plate-like setter plate may be 0.3 to 10mm, and the thickness of the protrusion may be 1 to 20 mm. The column part connecting the frame bodies may be provided inside the frame bodies.

The column portions may extend linearly so as to pass through the center of the frame bodies to connect the frame bodies, and connect the frame bodies. Further, "the center of the frame" means: when the frame is viewed in plan (viewed from the arrangement side of the flat setter), a center point of an outer edge or an inner edge of the frame, and a width and a thickness of the frame are constant in the circumferential direction, and the center point corresponds to "the center of gravity of the frame". The thickness of the pillar portion may be the same as that of the frame body, and may be, for example, 1 to 10mm or 1 to 5 mm. In the case where the frame body and the pillar portion are integrally molded, there is no clear boundary between the frame body (inner edge of the frame body) and the pillar portion at the connecting portion therebetween. In this case, the inner edges of the frame bodies of the portions to which the pillar portions are not connected are connected to each other, and a virtual inner edge of one turn is created, whereby the "center of the frame body" can be specified. The pillar portion may extend in one direction (the number of pillar portions may be 1) or may extend in a plurality of directions (the number of pillar portions may be plural), as long as the pillar portion passes through the center of the frame body. In addition to the frame body, the pillar portion may be provided with a projection portion. By providing the projecting portions on the column portions, the arrangement positions of the flat plate-like burning receiving plates can be restricted when the plurality of flat plate-like burning receiving plates are arranged on the burning rack. The opening in the frame (a space surrounded by the inner edge of the frame) is divided into a plurality of openings by the pillar portions. That is, by providing the column portion in the housing, the following are formed: and a plurality of surrounding portions surrounded by the frame body and the column portions.

The shape of the surrounding portion depends on the shapes of the frame and the column portion. For example, if the frame is a rectangle, if 1 pillar portion is formed to connect opposing sides (sides that do not share a vertex) of the frame, the surrounding portion is a rectangle. In addition, if 1 or 2 pillar portions are formed to connect opposing vertices (vertices not sharing a side) of the frame, the surrounding portion is triangular. In the case where the frame is rectangular or square, if 1 or 2 column portions are formed so as to be orthogonal to the sides of the frame, the surrounding portions are quadrangles having the same shape (the same size). Alternatively, in the case where the frame is rectangular or square, if 1 column part connects opposing vertices of the frame, each surrounding part is triangular with the same shape. Although not particularly limited, the plurality of surrounding portions formed in the housing preferably have the same shape. When the surrounding portions have the same shape, all of the surrounding portions may have the same size or different sizes.

The sub-column portion is provided in the surrounding portion and extends from the center of the surrounding portion toward the frame body or the column portion. A plurality of sub column portions are provided in the surrounding portion, and all the sub column portions may be connected at the center of the surrounding portion. Further, "the center of the surrounding portion" means: when the width and thickness of the frame and the column portion constituting the surrounding portion are constant at the center point in a plan view of the surrounding portion (the baking frame), this corresponds to "the center of gravity of the surrounding portion". In addition, when the sub pillar portion is integrally molded with the frame body and/or the pillar portion constituting the surrounding portion, the "center of the surrounding portion" can be determined by connecting the inner surfaces (inner surfaces) of the portions to which the sub pillar portion is not connected to each other and creating one virtual surrounding portion. The sub-column portion may extend radially (linearly) from the center of the surrounding portion, or may extend in a curved shape (non-linear shape). In addition, when the sub pillar portions radially extend from the center of the surrounding portion, angles formed by adjacent sub pillar portions may be all equal. The direction in which the pillar portion (the member constituting the surrounding portion) extends and the direction in which the sub-pillar portion extends may be the same or different. In addition, the surfaces of the frame body, the pillar portion, and the sub-pillar portion may be included in the same plane. Accordingly, the arrangement surface of the flat plate-shaped burning board can be formed by the whole of the frame body, the column part and the sub-column part. The thickness of the sub-column portion may be the same as the thickness of the column portion and the frame body, and may be, for example, 1 to 5 mm.

Examples

(first embodiment)

The firing rack 50 and the firing jig 60 will be described with reference to fig. 1 and 2. Fig. 1 shows a firing rack 50, and fig. 2 shows: the burning jig 60 is obtained by disposing the flat-plate-shaped burning receiving plate 32 on the burning rack 50. Fig. 2 corresponds to a cross section taken along line II-II of fig. 1. The baking frame 50 and the baking plate 32 are made of SiC. The baking jig 60 is formed by arranging 2 baking plates 32 on 1 baking rack 50. The firing jig 60 is used to place a ceramic product to be fired in a firing process of the ceramic product or the like.

As shown in fig. 1, the firing rack 50 includes: a frame body 2; a column part 4 passing through the center 6 of the frame 2;

sub-column portions

14a and 14b that pass through

centers

12a and 12b of surrounding

portions

10a and 10b formed by being surrounded by the frame body 2 and the column portion 4; and projections (ribs) 24 and 26 provided on the frame 2 and a part of the column portion 4. The frame body 2 is constituted by 2 first frame portions 2a extending in the X direction and 2 second frame portions 2b extending in the Y direction orthogonal to the X direction, and has a substantially rectangular ring shape in outer shape. Therefore, an opening is formed inside the frame 2. The pillar portion 4 extends in the Y direction (parallel to the second frame portion 2b) so as to connect the

first frame portions

2a and 2 a. As a result, the openings in the frame 2 are divided into 2 by the column portions 4. The openings divided into 2 are divided into 4 by the

sub column portions

14a and 14b, and 8

triangular openings

20a and 20b are formed in the frame body 2 in total. The width of the frame 2 (the Y-direction length of the first frame portion 2a, the X-direction length of the second frame portion 2b) is constant.

The burning rack 50 has 2 setter

plate placement regions

30a and 30 b. That is, 2 setter plates 32 can be arranged in 1 setter 50. The

setter disposition regions

30a and 30b are constituted by the frame 2, the column 4, and the sub-columns 14a and 14 b. Specifically, the setter disposition region 30a is constituted by a part of the frame 2, a part of the column portion 4, and the sub-column portion 14 a. The setter disposition region 30b is formed by a part of the frame 2, a part of the column portion 4, and the sub-column portion 14 b. The protruding

portions

24 and 26 are disposed so as to surround the

setter disposition regions

30a and 30 b. The protruding portions 24 are provided at four angular positions of the baking frame 50, and the protruding portions 26 are provided at both ends of the column portion 4 (the center in the longitudinal direction (X direction) of the first frame portion 2 a). The protruding portion 24 is disposed so as to surround both the

setter placement areas

30a, 30b, and the protruding portion 26 is provided so as to separate the

setter placement areas

30a, 30 b. That is, the

setter disposition regions

30a and 30b are formed by the

projections

24 and 26.

In addition, the setter disposition region 30a and the setter disposition region 30b have substantially the same structure. Therefore, in the following description, when substantially the same configuration is described with respect to the components of the setter placement area 30a, the components of the setter placement area 30b, and the like, the reference numerals may be omitted for description.

The surfaces of the frame 2, the column part 4, and the subsidiary column part 14 (arrangement surfaces for arranging the setter plates 32) are included in the same plane (X-Y plane). That is, the surface of the setter plate placement area 30 is flat. Therefore, the setter plate 32 is supported by 3 of the frame 2, the column part 4, and the sub-column part 14. Since the protruding

portions

24 and 26 are disposed so as to surround the setter disposition region 30, the protruding

portions

24 and 26 are not located on the back surface of the setter 32 when the setter 32 is disposed on the setter 50.

As shown in fig. 1, the pillar portion 4 extends in the Y direction between the first frame portions 2a so as to pass through the center 6 of the frame body 2. That is, the pillar portion 4 is parallel to the second frame portion 2b and orthogonal to the first frame portion 2 a. The column portion 4 is integrally formed with the frame body 2 (first frame portion 2 a). The width (X-direction length) of the column portion 4 is constant in the Y-direction (excluding a portion integral with the frame body 2). By providing the column portion 4 in the frame body 2, the surrounding portions 10(10a, 10b) are formed on both sides (both sides in the X direction) of the column portion 4. The surrounding

portions

10a and 10b are square, and have the same size.

In the surrounding portion 10, 4 sub column portions 14 extend toward the frame body 2 or the column portion 4 (toward the outside of the surrounding portion 10) starting from the center 12 of the surrounding portion 10. The surrounding portion 10 shown in fig. 1 is: the inner surface of the frame 2 (the portion where the column portion 4 and the sub-column portion 14 are not connected) and the side surface of the column portion 4 (the portion where the frame 2 and the sub-column portion 14 are not connected) extend and are connected to each other to form a virtual range (virtual enclosure portion). The subsidiary pillar portion 14 extends radially from the center 12 toward the apex of the surrounding portion 10. Therefore, the sub column portion 14 is not parallel to (extends in different directions from) the frame body 2 and the column portion 4. Further, the angle formed by the adjacent sub-column portions 14 is 90 degrees. The sub-column portions 14, the frame body 2, and the column portion 4 are integrally molded. Therefore, it can also be considered that 1 subsidiary pillar portion 14 connecting the center 12 and 4 vertices of the surrounding portion 10 is provided in the surrounding portion 10 of a quadrangle (square).

The advantages of the baking jig 50 will be described. Since the baking frame 50 is formed by the frame body 2 having the opening inside, the temperature difference (in-plane temperature distribution) between the central portion of the setter and the end portion of the setter can be reduced as compared with a baking frame having a flat setter disposition surface, for example. In other words, the baking frame 50 can improve the temperature following property at the central portion of the baking plate. Further, since the column portions 4 connect the frames 2 to each other so as to pass through the center 6 of the frame 2, the frame 2 itself or the burning receiving plate can be prevented from being deformed during the burning. Further, since the strength of the burning rack 50 is improved by providing the column portions 4, the thickness of the burning rack 50 (the thickness of the surface on which the burning receiving plate is disposed) can be reduced, and a lightweight burning rack 50 can be realized. Further, as the thickness of the setter plate placement surface becomes thinner, the heat capacity of the setter plate placement surface decreases, and the temperature following property of the setter plate improves.

In the baking frame 50, the sub-column portion 14 is provided in the surrounding portion 10 formed by surrounding the frame body 2 and the column portion 4, whereby the in-plane temperature distribution of the baking plate can be further reduced at the time of baking. As described above, by forming the baking frame 50 using the frame body 2, the temperature following property of the central portion of the baking receiving plate can be improved. However, in the case where the sub-column portion is not provided in the surrounding portion 10, a temperature difference is likely to occur between a portion corresponding to the center of the surrounding portion of the setter and a portion corresponding to the outer side of the surrounding portion (a portion where the setter and the frame or the column portion are in contact). Specifically, the temperature of the setter plate may increase at a portion corresponding to the center of the surrounding portion, and may decrease at a portion corresponding to the outer side of the surrounding portion. If the sub-column portion 14 is provided in the surrounding portion 10 like the baking frame 50, a thermal bridge is formed between the center 12 of the surrounding portion 10 and the outside of the surrounding portion 10, and the in-plane temperature distribution of the baking sheet can be reduced.

As shown in fig. 3, a plurality of firing jigs 60 (firing jigs 50) may be stacked during firing. In this case, by providing the

protrusions

24 and 26 on the surface of the frame body 2, when the baking frame 50 is laminated, a gap can be provided between the baking plate 32 and the baking frame 50 laminated above the baking plate 32. By stacking the baking racks 50, a space (a space for arranging the objects to be baked) can be secured on the surface of the baking plate 32 without using a spacer or the like that is separate from the baking racks 50. The baking rack 50 may have, on the back surface of the housing 2 (the surface opposite to the surface on which the protruding

portions

24 and 26 are provided): a recess for receiving the tip end portions (end portions in the projecting direction (Z + direction)) of the projecting

portions

24, 26. By housing the distal ends of the protruding

portions

24 and 26 in the recesses, the sintering racks 50 can be prevented from being displaced from each other.

Further, by providing the

projections

24 and 26, the setter 32 can be positioned on the surface of the setter 50 for firing. That is, it is possible to suppress: the movement of the setter 32 relative to the firing rack 50, such as the setter 32 falling from the firing rack 50. Even if the rear surface of the frame 2 is provided with the protruding portion, a gap can be provided between the baking jigs. However, in this case, the setter plate 32 cannot be positioned on the surface of the setter for firing, and the setter plate 32 may be displaced from the setter for firing due to vibration or the like. Therefore, the baking frame having the protruding portion provided on the rear surface of the frame body 2 is not suitable for: for example, the present invention is used in a continuous firing furnace or the like in which vibration is easily applied to a firing rack. The baking rack 50 can be used in various types of baking furnaces because it positions the baking receiving plate 32 by the

projections

24 and 26 provided on the surface of the frame body 2. In the case of using a setter plate having a size larger than the size of the setter plate 32 (for example, a size 2 times as large as the setter plate 32), the protrusion 26 may be eliminated. Even in this case, if the protrusions 24 are provided at four angular positions of the frame body 2, a space can be secured on the surface of the setter, and the setter can be positioned on the surface of the setter.

The baking racks 150, 250, and 350 will be described below. The baking frames 150, 250, and 350 are modifications of the baking frame 50. Therefore, the parts substantially identical to the burning rack 50 may be given the same reference numerals or the same reference numerals as those given to the burning rack 50, and the description thereof may be omitted. In addition, the baking jigs are formed by disposing the baking receiving plates on the surfaces of the baking racks 150, 250, and 350 in the same manner.

(second embodiment)

In the firing rack 150 shown in fig. 4, the extending direction of the sub-column portions 16 and 18 is different from that of the sub-column portion 14 of the firing rack 50. Specifically, the sub column portion 16(16a, 16b) extends parallel to the second frame portion 2b (in the Y direction), and connects the

first frame portions

2a, 2 a. The sub column portion 18(18a, 18b) extends parallel to the first frame portion 2a (in the X direction), and connects the second frame portion 2b and the column portion 4. The sub-pillar portions 16 and 18 divide the inside of the surrounding

portions

10a and 10b into 4, and 8

square openings

120a and 120b in total. Even in such a case, thermal bridges (sub-column portions 16, 18) are formed from the center of the surrounding portion 10 to the end portions of the surrounding portion 10, and the in-plane temperature distribution of the setter plate can be reduced. In the baking frame 150, the sub-column portion 14a (see fig. 1) may be provided instead of the

sub-column portions

16a and 18a in the surrounding portion 10a without changing the configuration in the surrounding portion 10 b.

(third embodiment)

The baking frame 250 shown in fig. 5 is configured such that: the frame 2 has a substantially square annular shape. The firing rack 250 includes: a first column section 4a connecting the first frame sections 2a, and a second column section 4b connecting the

second frame sections

2b, 2 b. The first pillar portion 4a extends in the Y direction (parallel to the second frame portion 2b), and the second pillar portion 4b extends in the X direction (parallel to the first frame portion 2 a). The

column portions

4a and 4b form 4 enclosure portions 10(10a, 10b, 10c, and 10d) in the housing 2. In each surrounding portion 10, 4 sub pillar portions 14(14a, 14b, 14c, 14d) are provided from the center 12(12a, 12b, 12c, 12d) of each surrounding portion 10 toward the apex of each surrounding portion 10. As a result, the baking frame 250 has 16 triangular openings 20(20a, 20b, 20c, 20d) in total in the frame 2. The surrounding portions 10 have the same configuration (the form of the frame 2, the column portion 4, and the sub-column portion 14 constituting the surrounding portions 10).

In the baking frame 250, the protrusions 24 are provided at the four corners of the baking frame 250, and the protrusions 26 are provided at the both ends of the column portion 4b and the center of the column portion 4b (including the center 6 of the baking frame 250 and the center of the column portion 4 a). As a result, 4 setter placement regions 30(30a, 30b, 30c, and 30d) are provided in the setter 250. That is, 4 setter plates can be arranged in 1 setter 250. Each setter plate placement area 30 includes 1 surrounding portion 10. As described above, the surrounding portions 10(10a, 10b, 10c, 10d) have the same configuration. Therefore, the setter plate placement areas 30(30a, 30b, 30c, and 30d) have the same configuration. In the baking frame 250, the sub column portions 16 and 18 (see fig. 4) may be provided in place of the sub column portion 14 in any one or all of the surrounding

portions

10a, 10b, 10c, and 10 d. Alternatively, the projection 26 may be eliminated, and 1 or 2 setter plates may be arranged in 1 setter 250 (so that the setter plate arrangement area is 1 or 2).

(fourth embodiment)

The baking frame 350 shown in fig. 6 is configured such that: the frame 2 has a substantially square annular shape, and includes a first column portion 304a connecting opposing apexes of the frame 2 (intersections between the first frame portion 2a and the second frame portion 2b), and a second column portion 304b connecting apexes different from the apexes connected to the first column portion 304 a. That is, in the baking frame 350, the

column portions

304a and 304b extend in a direction different from the frame body 2 (the first frame portion 2a and the second frame portion 2 b). In the

baking frame

350, 4 triangular surrounding portions 310(310a, 310b, 310c, 310d) are formed in the frame body 2 by the

column portions

304a, 304 b. Within each surrounding portion 310, 3 sub pillar portions (1

sub pillar portion

15 and 2 sub pillar portions 17) extend from the center 312(312a, 312b, 312c, 312d) of each surrounding portion 310 toward the apex of each surrounding portion 310. The sub-column portion 15 extends from the center 312 toward the intersection of the

column portions

304a and 304b (toward the center 6 of the baking frame 350). The sub-column portion 17 extends from the center 312 toward an intersection between the column portion 304 and the frame body 2. Each of the surrounding portions 310 has 3

triangular openings

21, 22, and 23 formed therein, and the frame 2 has 12

openings

21, 22, and 23 formed therein in total. The surrounding portions 310 have the same configuration (the form of the frame body 2, the column portion 304, and the sub-column portions 15 and 17).

In the baking frame 350, the protruding

portions

24 and 26 are provided at substantially the same positions as the baking frame 250 (see fig. 5 for comparison). Specifically, the protruding portions 24 are provided at the four corners of the baking frame 350, and the protruding portions 26 are provided at the intersections of the

pillar portions

304a and 304b (positions including the center 6 of the baking frame 350) and the midpoints in the longitudinal direction (Y direction) of the second frame portion 2 b. As a result, in the

baking frame

350, 4 setter placement regions 30(30a, 30b, 30c, and 30d) are formed at the same positions as the baking frame 250 (fig. 5). Therefore, in the baking frame 350, each of the baking plate disposition regions 30 is constituted by a part of the 2 surrounding portions 310. However, since the surrounding portions 310 have the same structure, the setter plate placement areas 30 have the same structure as a result. In the baking frame 350, the protrusion 26 may be omitted, and 1 or 2 setter plates may be arranged in 1 baking frame 350 (the setter plate arrangement region may be 1 or 2).

The above-described

baking racks

50, 150, 250, 350 have the following general features that are provided in the frame body 2 having the opening: the column parts (column parts 4, 304) extending between the frame bodies 2 so as to pass through the center 6 of the frame body 2 are provided in the surrounding parts (surrounding parts 10, 310) formed by surrounding the frame body 2 and the column parts (column parts 4, 304): and a plurality of sub-column portions (

sub-column portions

14, 15, 16, 17, 18) extending from the center (center 12, 312) of the surrounding portion toward the end portions (frame body 2 and column portions) of the surrounding portion. As a result, during firing, the temperature difference (difference in temperature following property) between the center of the surrounding portion and the end portion of the surrounding portion is alleviated, and the in-plane temperature distribution of the setter plate can be reduced.

While specific examples of the present invention have been described in detail above, these specific examples are merely illustrative and are not intended to limit the scope of the claims. The techniques described in the claims include various modifications and changes to the specific examples described above. Technical elements described in the specification and drawings exhibit technical usefulness alone or in various combinations, and are not limited to combinations described in claims at the time of filing. In addition, the technology illustrated in the present specification or the drawings can achieve a plurality of objects at the same time, and achieving one of the objects has technical usefulness itself.

Description of the symbols

2: frame body

4: column part

6: center of the frame

10: surrounding part

14: auxiliary column part

32: flat-plate-shaped burning bearing plate

50: frame for firing

60: clamp for firing

Claims

1. A baking rack is composed of: a flat-plate-shaped setter capable of placing an object to be fired on the setter,

the rack for firing is provided with:

a frame body having an opening portion on a surface thereof, the frame body being used for disposing the flat burning board;

a column part extending between the frame bodies so as to pass through the center of the frame bodies;

a plurality of surrounding portions formed by being surrounded by the frame body and the pillar portion; and

a plurality of sub column portions extending from a center of the surrounding portion toward the frame body or the column portion.

2. The rack for firing according to claim 1,

the surrounding portions are each shaped as a polygon of the same shape.

3. The burning rack according to claim 1 or 2,

the direction in which the pillar portion extends and the direction in which the sub-pillar portion extends are different.

4. The rack for firing according to any one of claims 1 to 3,

the surface of the frame body is provided with: and a plurality of protruding parts which can limit the arrangement position of the flat burning board.

5. The rack for firing according to any one of claims 1 to 4,

the material of the sintering frame is silicon carbide.

6. A jig for firing is characterized by comprising:

the frame for firing according to any one of claims 1 to 5; and

a flat-plate-shaped setter disposed on a surface of the setter,

the baking rack and the flat baking plate are made of the same material.