JP7545476B2 - Plate-shaped firing jig - Google Patents

Description

The present invention relates to a plate-shaped firing jig on which ceramic products and the like are placed when they are fired.

2. Description of the Related Art Conventionally, a process for manufacturing ceramic products and the like includes a firing step in which an object to be fired is fired in a firing furnace. In the firing step, the object to be fired is placed on a firing jig in the firing furnace and fired.

As the firing jig, a shelf plate on which the object to be fired is placed (see Patent Document 1), a setter that supports the shelf plate on which the object to be fired is placed (see Patent Document 2), and a brick member have been proposed. The firing jig on which the object to be fired is placed is installed in a firing furnace in one layer or in a state where multiple layers are stacked. Then, the fired object to be fired is removed from the firing furnace.

Japanese Patent Application Publication No. 8-166191 International Publication No. 2015/008503

However, when the firing jig is damaged due to chipping at its corners or edges during the reassembly of the fired objects or during transportation in and out of the firing furnace, the firing jig must be replaced, making it difficult to maintain the expected production speed. Also, the replacement of firing jigs is one of the factors that increases production costs.

In view of the above problems, the present invention provides a plate-shaped firing jig that can maintain the expected production speed of the firing process and reduce production costs by avoiding damage to the firing jig.

The plate-shaped sintering jig of the present invention, which has been made to solve the above-mentioned problems, is characterized by having a plate-shaped base material, a protrusion protruding outward from the outer periphery of the plate-shaped base material, and a connecting portion connecting the plate-shaped base material and the protrusion.
With this configuration, damage to the firing jig due to chipping of corners or end faces when the firing jig is reassembled or transported into the kiln can be avoided, thereby improving production speed and reducing production costs.

The plate-shaped firing jig of the present invention prevents damage to the firing jig due to chipping at the corners or end faces of the firing jig when it is rearranged or transported into a kiln, thereby enabling improved production speed and reduced production costs.

1A is a plan view of a plate-shaped firing jig according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line AA in FIG. 1. FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, illustrating the angle of the inclined surface of the connection portion. 1A is a front view showing a modified example of the plate-shaped firing jig of the first embodiment according to the present invention, and FIG. 1B is a front view showing another modified example of the plate-shaped firing jig of the first embodiment according to the present invention. FIG. 4 is a plan view of a plate-shaped firing jig according to a second embodiment of the present invention. 6 is a cross-sectional view taken along line BB in FIG. 5. FIG. 6 is a cross-sectional view taken along line BB in FIG. 5, illustrating the angle of the inclined surface of the hollow connector. 1A is a plan view of a plate-shaped firing jig according to a third embodiment of the present invention, and FIG. 9 is a cross-sectional view taken along line CC of FIG. 8. FIG. 13 is a plan view of a plate-shaped firing jig according to a fourth embodiment of the present invention. 1 is a front view showing a state in which an object to be fired is placed on a plate-shaped firing jig of a first embodiment according to the present invention. FIG. 1 is a front view showing a state in which plate-shaped firing jigs according to a first embodiment of the present invention are stacked. FIG. FIG. 11 is a front view of another embodiment showing a state in which plate-shaped firing jigs according to the present invention are stacked. 1 is a table showing test results of Examples 1 to 20 and Comparative Examples 1 and 2 of the plate-shaped firing jig according to the present invention.

Hereinafter, plate-shaped firing jigs according to first to fourth embodiments of the present invention will be described with reference to the accompanying drawings.

First, a plate-shaped baking jig according to a first embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 1(a) is a plan view of the plate-shaped baking jig according to the first embodiment of the present invention, and (b) is a front view of (a). Fig. 2 is an enlarged view of the line A-A of the plate-shaped baking jig according to the first embodiment of the present invention.

As shown in Figures 1 and 2, the plate-shaped sintering jig 10 of the first embodiment has a plate-shaped base material 11, a protrusion 13 protruding outward from an outer periphery 12 of the plate-shaped base material 11, and a connection portion 14 connecting the plate-shaped base material 11 and the protrusion 13.

As shown in Fig. 1(a), the plate-shaped base material 11 is formed in a substantially rectangular shape in a plan view. Also, as shown in Fig. 1(b), the plate-shaped base material 11 is plate-shaped. Note that the plate-shaped base material 11 is not limited to a substantially rectangular shape, and may be a polygonal shape such as a square or a triangle, or may be another shape such as a circle or an ellipse.

The protruding portion 13 is formed to protrude outward from the outer peripheral portion 12 of the plate-shaped base material 11. Here, the protruding portion 13 is provided in a range of 50% to 100% of the total side length of the outer peripheral portion 12 of the plate-shaped base material 11. In this way, if the protruding portion 13 is 50% to 100% of the total side length of the outer peripheral portion 12, it can be provided on the side wall surface of the electric furnace that is likely to come into contact when the plate-shaped firing jig 10 is transported into the electric furnace, for example, and damage to the plate-shaped base material 11 can be avoided (see FIG. 14). Furthermore, the protruding portion 13 is preferably 60% or more of the total side length of the outer peripheral portion 12 of the plate-shaped base material 11, and more preferably 75% or more.

As shown in FIG. 2, the thickness dimension t1 of the protruding portion 13 is 10% or more and 95% or less with respect to the thickness dimension T of the plate-shaped base material 11. If the thickness dimension t1 of the protruding portion 13 is 10% or more with respect to the thickness dimension T of the plate-shaped base material 11, even if there is a difference in the thickness dimension between the protruding portion 13 and the plate-shaped base material 11, no unevenness in the blending occurs (see FIG. 14). Also, if the thickness dimension t1 of the protruding portion 13 is less than 95% with respect to the thickness dimension T of the plate-shaped base material 11, damage to the plate-shaped base material 11 due to chipping occurring during reassembly or transportation can be avoided. Furthermore, the thickness dimension t1 of the protruding portion 13 is preferably 25% or more and 95% or less with respect to the thickness dimension T of the plate-shaped base material 11, more preferably 50% or more and 95% or less, and even more preferably 60% or more and 90% or less.

In addition, the protrusion 13 is thinned by a predetermined dimension from the front surface 15 and the back surface 16 of the plate-shaped base material 11. Specifically, the protrusion 13 is thinned by predetermined dimensions d1 and d2 from the front surface 15 and the back surface 16 of the plate-shaped base material 11.

The connection portion 14 connects the plate-shaped base material 11 and the protruding portion 13. The width dimension W1 of the connection portion 14 is 10% to 200% of the width dimension w1 of the protruding portion. If the width dimension W1 of the connection portion 14 is 10% to 200% of the width dimension w1 of the protruding portion, damage to the plate-shaped base material 11 due to chipping that occurs during reassembly or transportation can be avoided (see FIG. 14).

3, the connection portion 14 has an inclined surface that inclines from the plate-shaped base material 11 toward the protruding portion 13, and the angles θ1, θ2 between the inclined surface and the front surface 15 or the back surface 16 of the plate-shaped base material 11 are 20 degrees or more and 85 degrees or less. If the angles θ1, θ2 between the inclined surface and the front surface 15 or the back surface 16 of the plate-shaped base material 11 are 20 degrees or more and 85 degrees or less, damage to the plate-shaped base material 11 due to chipping that occurs during reassembly or transportation can be avoided (see FIG. 14).

Here, the inclined surface of the connection portion 14 may be not only linear but also curved, for example, as shown in Fig. 4 (a) and (b). Furthermore, the shape of the inclined surface of the connection portion 14 is not limited to these, and may be any shape that can be pressed.

1, the corners 17 of the plate-shaped baking jig 10 are rounded. By forming the corners of the plate-shaped baking jig 10 with the rounded corners, the chipping resistance of the corners 17 is improved.

The plate-shaped firing jig 10 having the above-mentioned configuration is formed by so-called press molding, in which a powdery or clay-like refractory material is poured into a die (not shown) and pressurized. The refractory material may be, for example, alumina, mullite, zirconia, cordierite, spinel, silicon carbide, silicon nitride, or a mixture thereof, and may be any material capable of withstanding high temperatures of, for example, 1,500° C. or higher.

Next, a plate-shaped baking jig 10A according to a second embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 5 is a plan view of the plate-shaped baking jig 10A according to the second embodiment of the present invention. Note that the same components as those of the plate-shaped baking jig 10 according to the first embodiment are given the same reference numerals, and the description thereof will be omitted as appropriate.

The plate-shaped sintering jig 10A of the second embodiment has a plate-shaped base material 11A, a protrusion 13 protruding outward from the outer periphery 12 of the plate-shaped base material 11A, and a connection portion 14 connecting the plate-shaped base material 11A and the protrusion 13. The plate-shaped base material 11A has a hollow portion 40, and a hollow protrusion 42 protruding inward from the inner periphery 41 of the hollow portion 40 is formed.

The hollow protrusion 42 is formed so as to protrude inward from the inner peripheral portion 41 of the hollow portion 40. Here, the hollow protrusion 42 is provided in a range of 50% to 100% of the total side length of the inner peripheral portion 41. By providing the hollow protrusion 42 in a range of 50% to 100% of the total side length of the inner peripheral portion 41, damage to the plate-shaped base material 11 due to chipping occurring during reassembly or transportation can be avoided (see FIG. 14). In addition, the hollow protrusion 42 is preferably 60% or more of the total side length of the inner peripheral portion 41, and more preferably 75% or more.

6, the thickness dimension t2 of the hollow protrusion 42 is preferably 10% to 95% of the thickness dimension T of the plate-shaped base material 11. If the thickness dimension t2 of the hollow protrusion 42 is 10% to 95% of the thickness dimension T of the plate-shaped base material 11, damage to the plate-shaped base material 11 due to chipping occurring during reassembly or transportation can be avoided (see FIG. 14).

Furthermore, a hollow connection portion 43 is formed to connect the inner periphery 41 and the hollow protrusion 42. The width dimension W2 of the hollow connection portion 43 is preferably 10% to 200% of the width dimension w2 of the hollow protrusion 43. If the width dimension W2 of the hollow connection portion 43 is 10% to 200% of the width dimension w2 of the hollow protrusion 43, damage to the plate-shaped base material 11 due to chipping occurring during reassembly or transportation can be avoided (see FIG. 14).

7, the hollow connection part 43 has an inclined surface that inclines from the inner periphery 41 toward the hollow protruding part 42, and the angle θ3, θ4 between the inclined surface and the front surface 15 or the back surface 16 of the plate-shaped base material 11 is 20 degrees or more and 85 degrees or less. If the angle θ3, θ4 between the inclined surface and the front surface 15 or the back surface 16 of the plate-shaped base material 11 is 20 degrees or more and 85 degrees or less, damage to the plate-shaped base material 11 due to chipping that occurs during reassembly or transportation can be avoided (see FIG. 14). Here, the inclined surface of the hollow connection part 43 may be not only linear but also curved.

The plate-shaped baking jig 10A of the second embodiment can be made lighter by providing the hollow portion 40. In addition, by providing the hollow portion 40, the hot air in the baking furnace can easily reach the lower surface side of the baking object X, so that the baking of the baking object X can be performed more efficiently.

Although the hollow portion 40 shown in FIG. 5 has a through-hole shape, it may have a shape in which the portion corresponding to the hollow portion is thin-walled, or it may have a shape that includes both a through-hole portion and a thin-walled portion.

A plate-shaped baking jig 10B according to a third embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 8(a) is a plan view of the plate-shaped baking jig 10B according to the third embodiment of the present invention, and (b) is a front view of (a). The same components as those of the plate-shaped baking jig 10 according to the first embodiment are given the same reference numerals, and the description will be omitted as appropriate.

The plate-shaped firing jig 10B of the third embodiment has a plate-shaped base material 11B, a protrusion 13 protruding outward from the outer periphery 12 of the plate-shaped base material 11B, and a connection portion 14 connecting the plate-shaped base material 11B and the protrusion 13, and the plate-shaped base material 11B has a slit portion 50, and slit protrusion portions 52 are formed which protrude toward each other from a slit inner periphery 51 of the plate-shaped base material 11B which forms the slit portion 50.

The slit protrusion 52 is formed on the inner peripheral portion 5 of the slit of the plate-shaped base material 11B forming the slit portion 50.
1, the slit protruding portions 52 are formed so as to face each other. Also, a slit connecting portion 53 is formed to connect the slit inner periphery portion 51 and the slit protruding portion 52.

9, the slit width dimension Ws of the slit portion 50 is 5% to 1,000% of the width dimension ws of the slit protruding portion 52. If the slit width dimension Ws of the slit portion 50 is 5% to 1,000% of the width dimension ws of the slit protruding portion 52, damage to the plate-shaped base material 11 due to chipping occurring during reassembly or transportation can be avoided (see FIG. 14).

The plate-shaped firing jig 10B of the third embodiment has a slit protrusion 52 formed in the slit portion 50, which prevents chipping caused by thermal expansion that occurs during the firing process in a firing furnace and suppresses damage such as cracks in the plate-shaped base material 11B.

Further, a plate-shaped baking jig 10C according to a fourth embodiment of the present invention will be described below with reference to the accompanying drawings. Fig. 10 is a plan view of the plate-shaped baking jig according to the fourth embodiment of the present invention. Note that the same components as those of the plate-shaped baking jig 10 of the first embodiment, the plate-shaped baking jig 10A of the second embodiment, and the plate-shaped baking jig 10B of the third embodiment are given the same reference numerals, and the description thereof will be omitted as appropriate.

The plate-shaped firing jig 10C of the fourth embodiment has a plate-shaped base material 11C, a protrusion 13 protruding outward from the outer periphery 12 of the plate-shaped base material 11C, and a connection portion 14 connecting the plate-shaped base material 11C and the protrusion 13. The plate-shaped base material 11C has a hollow portion 40, and a hollow protrusion 42 protruding inward from an inner periphery 41 of the hollow portion 40 is formed, and also has a slit portion 50, and slit protrusions 52 protruding toward each other from the slit inner periphery 51 of the plate-shaped base material 11C are formed.

The plate-shaped baking jig 10C of the fourth embodiment is provided with a hollow portion 40, which allows the plate-shaped baking jig 10A to be made lighter. As described below, the hot air in the baking furnace can easily reach the lower surface side of the baked object X, so that the baking of the baked object X can be performed more efficiently. Furthermore, the plate-shaped baking jig 10C of the fourth embodiment has a slit protrusion 52 formed in the slit portion 50, which can suppress damage to the plate-shaped base material 11B due to chipping in the slit portion 50 caused by thermal expansion during the baking process in the baking furnace.

The plate-shaped baking jigs 10, 10A, 10B, and 10C of the first to fourth embodiments described above are used to place the baking object X thereon and carry out the baking process as follows. Note that the plate-shaped baking jig 10 of the first embodiment will be described, but the plate-shaped baking jigs 10A, 10B, and 10C of the second to fourth embodiments are similar, so their description will be omitted.

As shown in Fig. 11, a setter 20 is placed on the surface 15 of the plate-shaped base material 11 of the plate-shaped firing jig 10 of the first embodiment, and the firing object X is placed on the upper surface 21 of the setter 20, which is then placed on a hearth 100 in a firing furnace, and the firing object X is fired. Here, the setter 20 is formed in a substantially rectangular shape in a plan view, and is a thin plate that is thinner than the thickness dimension T of the plate-shaped base material 11.

The setter 20 is made of a refractory material with high air permeability. The setter 20 has high air permeability, so that hot air in the firing furnace can easily pass through the setter 20 and reach the lower surface side of the fired object X, and the fired object X can be fired efficiently. An example of a refractory material with high air permeability is a porous plate having many pores.

Here, when a hollow portion 41 is formed, as in the plate-shaped firing jigs 10A and 10C of the second and fourth embodiments, the hot air in the firing furnace can more easily pass through the setter 20 and reach the underside of the fired object X, so that the firing of the fired object X can be carried out even more efficiently.

Also, as shown in Fig. 12, the plate-shaped firing jig 10 is placed on the hearth 100 in the firing furnace, and a block-shaped support member 30 is placed between a plurality of setters 20 on which the objects to be fired X are placed, resulting in a state in which the plate-shaped firing jig 10 is stacked in multiple stages. By stacking in multiple stages in this manner, more objects to be fired X can be fired at once than in the case of a single stage. Furthermore, as shown in Fig. 13, instead of the setters 20, it is also possible to stack the plate-shaped firing jigs 10 in multiple stages.

Regarding the plate-shaped baking jig 10 of the present embodiment described above, a thermal shock test, a sliding test, and a press die damage test were performed on the plate-shaped baking jig according to Examples 1 to 20 and the plate-shaped baking jig according to Comparative Examples 1 and 2. The configurations of Examples 1 to 20 and Comparative Examples 1 and 2, and the test results are as shown in FIG.

For the plate-shaped firing jigs according to Examples 1 to 20 and Comparative Examples 1 and 2, raw material powders of coarse-grained mullite (average particle size: about 200 μm) and fine-grained mullite (average particle size D ₅₀ : 3 μm) and an organic binder (methylcellulose, etc.) were stirred and mixed using a high-speed mixer so that Al ₂ O ₃ : 80 mass % and SiO ₂ : 20 mass % were obtained. The stirred mixture thus obtained was subjected to uniaxial pressure press molding to obtain a molded body having a shape as shown in FIG. 14 (see FIG. 10). These molded bodies were then fired in an air atmosphere (attained temperature: 1700° C.) to obtain a sintered body, thereby producing the plate-shaped firing jigs according to Examples 1 to 20 and Comparative Examples 1 and 2. In addition, the "thinning of the hollow portion" in Example 9 in FIG. 14 indicates that the hollow portion is not a through hole, but has a thin-walled concave portion when observed from the back surface 16 of the plate-shaped base material 11. In addition, Comparative Example 1 has a shape in which no protrusions 13 and no connection parts 14 are formed on the outer periphery of the plate-shaped base material 11. Furthermore, Comparative Example 2 has a shape in which no connection parts 14 are formed on the outer periphery of the plate-shaped base material 11, and the protrusions 13 are formed directly on the plate-shaped base material 11.

Thermal shock test
The thermal shock test is a test to evaluate the ease of crack extension that occurs when the plate-shaped firing jig is repeatedly heated and cooled, and was performed as follows. Specifically, (1) a dummy block (100 mm x 100 mm x 50 mm) is placed in the center of the upper and lower surfaces of the plate-shaped firing jig (200 mm x 200 mm x each base material thickness shown in Figure 14), which is a test specimen, and placed in an electric furnace, heated to 1,100 ° C., and held for one hour. (2) After removing the dummy block from the electric furnace, the test specimen is air-cooled to room temperature, and cracks that occur at the end of the protruding portion 13 of the test specimen are confirmed. Here, the dummy block is made of ceramics, and prevents the test specimen from coming into contact with the entrance and exit of the electric furnace or the wall surface and being damaged when moving the test specimen in and out of the electric furnace. The cracks were observed visually, and the crack length was measured using a crack measurement scale or gauge. The above steps from (1) to (2) were counted as one cycle, and a score was assigned based on the number of times ("number of times" in Table 1) that the above steps (1) and (2) were repeated until the maximum crack length that occurred at the end of the protrusion 13 of the test specimen reached 30 mm from the end. Test pieces that received 6 to 10 points were rated as A (good), as the crack that occurred at the end was very difficult to grow, test pieces that received 3 to 5 points were rated as B (fair), as the crack that occurred at the end was difficult to grow, and test pieces that received 1 to 2 points were rated as C (unacceptable), as the crack that occurred at the end was easy to grow.

<Sliding test>
The sliding test was a test to evaluate the chipping tendency when the plate-shaped firing jig was moved in an arbitrary direction, and was performed as follows. Specifically, (a) a plate-shaped firing jig (200 mm x 200 mm x thickness of each base material shown in Fig. 14) as a test specimen was placed, for example, with the back surface 16 of the plate-shaped firing jig 10 as the bottom surface, and a weight of a predetermined weight was placed on the front surface 15 of the plate-shaped firing jig 10, and the total weight of the test specimen was adjusted to 10 kg. Then, the test specimen was set in a sliding tester and slid horizontally in the front-rear direction on a brick made of the same material as the test specimen at a sliding speed of 100 mm/sec for a predetermined sliding distance (500 mm x 40 times = 20 m). Next, (b) the test specimen was raised 90 degrees on a brick made of the same material as the test specimen, for example, so that the protruding portion 13 provided on the outer periphery 12 of the plate-shaped firing jig 10 was the bottom surface, and then the plate-shaped firing jig 10 was returned to the bottom surface with the back surface 16, i.e., the so-called raising and lowering operation was repeated 10 times, and cracks and chips occurred at the end of the protruding portion 13 of the test specimen were confirmed, and it was confirmed whether the maximum value of the cracks and chips occurred at the end was 10 mm or more. Here, the raising and lowering operation was performed continuously until the end of 10 round trips. Furthermore, 10 round trips of the raising and lowering operation were set as one set, and a rest time of 10 minutes or more was provided for each set. During this raising and lowering operation, the protruding portion 13 and the back surface 16 were not subjected to impact due to dropping. Furthermore, the cracks and chips were measured visually using a crack measurement scale or gauge. Among the cracks and chips that occurred at the end of the protrusion 13 of the test specimen, a score was assigned based on the number of sets (see Table 2) in which the above steps (a) and (b) were repeated until the maximum size of the cracks and chips that occurred at the end reached 10 mm or more. Those that received 6 to 10 points were rated as A (good), as it was very unlikely for cracks and chips to occur at the end, those that received 3 to 5 points were rated as B (fair), as it was unlikely for cracks and chips to occur at the end, and those that received 1 to 2 points were rated as C (unacceptable), as it was likely for cracks and chips to occur at the end.

<Press die damage test>
The press die damage test is a test to evaluate the damage caused to the press die which has been repeatedly pressed against the plate-shaped sintering jig, and was performed as follows. Specifically, the press die was abutted against the plate-shaped sintering jig (200 mm x 200 mm x each base material thickness shown in FIG. 14) as the test body from above and below, and the press die was pressed for 5 seconds until the molding pressure reached 100 MPa, and the molding pressure was held at 100 MPa for 5 seconds, and then the pressure was reduced for 3 seconds. This process was repeated a predetermined number of times (for example, 100 times). After that, the press die was separated from the test body, and the damage state of the press die was confirmed. Here, when cracks and chips with a maximum length of 10 mm or more were confirmed, for example, at the end of the press die, it was determined that the press die was damaged. The cracks and chips were measured visually using a crack measurement scale or gauge. In addition, the above process was continuously performed until it was repeated 100 times. Furthermore, 100 times of the above process was considered as one set, and a rest time of 10 minutes or more was provided for each set. A score was then assigned based on the number of sets repeated until the press die was damaged (see Table 3). A score of 6 to 10 points was evaluated as A (good), indicating that the press die was very unlikely to be damaged, a score of 3 to 5 points was evaluated as B (fair), and a score of 1 to 2 points was evaluated as that the press die was prone to damage, and a score of C (unacceptable).

The inventions disclosed in this specification include, in addition to the configurations of each invention or embodiment, those that are specified by changing these partial configurations to other configurations disclosed in this specification, to the extent applicable, or those that are specified by adding other configurations disclosed in this specification to these configurations, or those that are specified as higher-level concepts by deleting these partial configurations to the extent that partial action and effects are obtained.

The plate-shaped base materials 11, 11A, 11B, and 11C of the plate-shaped firing jigs 10, 10A, 10B, and 10C of the first to fourth embodiments of the present invention are flat, but a support portion (not shown) protruding vertically from the back surface 16 of the plate-shaped base materials 11, 11A, 11B, and 11C may be provided, and a recessed receiving portion (not shown) may be provided on the front surface 15 of the plate-shaped base materials 11, 11A, 11B, and 11C at a position that can receive the support portion in the vertical direction. By providing the support portion (not shown) and the receiving portion (not shown), as shown in FIG. 13, the block-shaped support member 30 can be stacked in multiple stages without being placed between multiple plate-shaped firing jigs 10.

Reference Signs List 10, 10A, 10B, 10C... Plate-shaped firing jig 11, 11A, 11B, 11C... Plate-shaped base material 12... Outer periphery 13... Protruding portion 14... Connection portion 15... Front surface 16... Back surface 17... Corner portion 20... Setter 30... Support member 40... Hollow portion 41... Inner periphery 42... Hollow protruding portion 43... Hollow connection portion 50... Slit portion 51... Slit inner periphery 52... Slit protruding portion 53... Slit connection portion 100... Hearth X... Material to be fired

Claims (9)

A plate-shaped base material;
a protruding portion protruding outward from an outer periphery of the plate-shaped base material;
a connection portion that connects the plate-shaped base material and the protrusion;
having
A plate-shaped firing jig, characterized in that the surface of the connection portion connected to the surface of the plate-shaped base material and the surface of the protrusion portion connected to the surface of the connection portion have mutually different angles relative to the surface of the plate-shaped base material . The plate-shaped firing jig according to claim 1, characterized in that the protrusions are provided in a range of 50% to 100% of the total side length of the outer periphery of the plate-shaped base material. The plate-shaped firing jig according to claim 1 or 2, characterized in that the thickness dimension of the protrusion is 10% or more and 95% or less of the thickness dimension of the plate-shaped base material. A plate-shaped firing jig according to any one of claims 1 to 3, characterized in that the width dimension of the connection portion is 10% to 200% of the width dimension of the protrusion portion. The plate-shaped firing jig according to any one of claims 1 to 4, characterized in that the connection portion has an inclined surface that slopes from the plate-shaped base material toward the protruding portion, and the angle between the inclined surface and the front or back surface of the plate-shaped base material is 20 degrees or more and 85 degrees or less. 6. The plate-shaped firing jig according to claim 1, wherein the protrusion is thinned from the front and back surfaces of the plate-shaped base material. The plate-shaped base material has a hollow portion,
7. The plate-shaped firing jig according to claim 1, further comprising a hollow protruding portion protruding inward from an inner periphery of the hollow portion. The plate-shaped base material has a slit portion,
8. The plate-shaped firing jig according to claim 1, wherein slit protrusions are formed so as to protrude toward each other from the inner periphery of the slit of the plate-shaped base material forming the slit portion. 9. The plate-shaped firing jig according to claim 8, wherein a slit width dimension of the slit portion is 5% to 1,000% of a width dimension of the slit protruding portion.

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