JPH09159374A - Box for baking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a box for baking, capable of supplying atmospheric gas to the whole of piled and received ceramic formed bodies even when the box is piled in a multitude of stages, facilitated in the piling work and capable of developing sure retention of the piled posture thereof. SOLUTION: A box 8 for baking receives a multitude of ceramic formed bodies M and is piled in a multitude of stages in a baking furnace and is provided with a main body 9 having a peripheral wall across the whole periphery thereof. A part or the whole of respective peripheral wall and bottom part of the main body 9 is provided with ventilating property by reticulated bodies 12 and several pieces of supporting pillars 10 are established on the peripheral wall of the main body 9 with a space between each other while a receiving rim for receiving the box 8 at the upper stage is provided on the supporting pillars 10. In this case, the receiving rim 11 is preferable to have a receiving rim 13, slanted so as to have the shape of a hopper, whose lower side is narrowed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a firing box used when firing a ceramic molded body which is an electronic component such as a multilayer chip capacitor.

[0002]

2. Description of the Related Art Among ceramic moldings used as electronic parts, those requiring a high degree of atmosphere control use a batch-type firing furnace. In this batch-type firing furnace, a large number of ceramic moldings are used. It is housed in a box and placed in the furnace. In this case, in order to improve the mass productivity, it is often the case that the boxes are stacked in multiple stages, and examples of the boxes used in the multi-stage stack include those shown in FIGS. 6 to 7.

That is, all the boxes shown in both figures are made of ceramics, and the box shown in FIG. 6 is a plate body 2 provided with rising walls 1 and 1 on both sides in the width direction. Further, the one shown in FIG. 7 is composed of a plate body 3 and columns 4, and the columns 4 are erected at the four corners of the plate 3 and the upper plate 3 is placed thereon. Note that the symbol M indicates a ceramic compact that is deposited and accommodated. In the case as described above, the atmosphere gas is smoothly supplied between the upper and lower cases, and as a result, the atmosphere gas can be quickly replaced. proceed.

[0004]

By the way, in the multi-tiered box according to the conventional example, the atmospheric gas flowing between the upper and lower boxes spreads to the surface portion of the deposition group of the ceramic molded body, but There is a tendency that it does not penetrate sufficiently into the interior, and if the amount of deposition is large, it will be difficult to apply an even atmosphere gas to each of the ceramic compacts. Therefore, the amount of the ceramic molded body accommodated in a single box is limited to a relatively small amount.

Further, in the box of FIG. 6, since the flowing direction of the atmospheric gas is limited, variations in the permeation of the atmospheric gas are likely to occur, and in the box of FIG. 7, it is troublesome to carry out the multi-stage stacking work. There are also problems. Therefore, in the case of the multi-tiered box, a large number of ceramic compacts can be deposited and accommodated in each and the atmosphere gas can be sufficiently spread to the inside of the deposit group. .

On the other hand, as the box which is arranged in the furnace in a single stage without being stacked in multiple stages, one shown in FIG. 8 is considered. That is, this box 5 is provided with a main body having a peripheral wall 6 over the entire circumference, and a part of the peripheral wall 6 is made of a refractory metal net 7 or a perforated plate to have air permeability. ing. Although not shown in the drawings, a perforated plate is provided at the bottom of the main body, and atmospheric gas flows into the main body after passing through the perforated plate.

In such a box, the atmospheric gas can be spread over the entire deposition group even if a large amount of the ceramic compacts are accommodated in the interior. However, when these are stacked in multiple stages, The following problems occur. That is, the peripheral wall of the lower box surrounds the bottom of the upper box, and in the upper box, the atmospheric gas flowing from the bottom is small, and the atmospheric gas does not fully spread to the entire deposition group. Also, since the upper casing is supported by the peripheral wall of the main body, it is necessary to place the upper casing in the horizontal position, which is not only troublesome to stack, but also in the horizontal direction when stacked. The stacking posture may be easily collapsed by the external force of.

The present invention was devised in view of these inconveniences, and it is possible to supply the atmospheric gas to the whole of the ceramic compacts that are deposited and accommodated even when they are stacked in multiple stages, and further stack them. It is an object of the present invention to provide a firing box that is easy to work with and that can reliably hold the stacked posture.

[0009]

A firing box according to claim 1 of the present invention accommodates a large number of ceramic compacts and is stacked in a firing furnace in multiple stages, and has a peripheral wall over the entire circumference. A main body is provided, and a part or all of each of the peripheral wall and the bottom of the main body has air permeability by a mesh body, and several columns are erected at intervals on the peripheral wall of the main body, and It is characterized in that a receiving edge for receiving the upper case is provided on these columns.

The receiving edge of the firing box according to the second aspect is inclined so as to have an upwardly widening shape which becomes lower toward the inside. In addition, a contact edge which is inclined upward to correspond to the receiving edge is provided on the outer periphery of the bottom portion of the main body constituting the firing box according to the third aspect.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view showing the entire structure of the firing box according to the first embodiment, and FIG. 2 is a half cross-sectional view of the state in which the firing box is used. Reference numeral 8 in these figures shows the entire box. The reference numeral 9 indicates the main body, 10 indicates the column, and 11 indicates the receiving edge.

The main body 9 constituting the firing box 8 according to the first embodiment is a circular case having an open top surface, and is composed of a circular bottom portion 9a and a peripheral wall 9b standing upright all around. . The entire body 9 is made of a heat-resistant metal such as nickel or a nickel-based alloy, and has a bottom portion 9
a and a part of the peripheral wall 9b are made of the refractory metal net 1
By having been set to 2, it has breathability. Note that the symbol M indicates a ceramic molded body that is deposited and accommodated.

In the illustrated example, the main body 9
The frame portion is made of a heat-resistant metal plate material, and the gap between the frames is shielded by the heat-resistant metal net 12. However, if the net has sufficient shape-retaining strength, the entire main body 9 can be netted. It is also possible to configure. A perforated plate may be used in place of the net, and the perforated plate may form part or all of the main body 9. In the present invention,
The metal net and the perforated plate are collectively referred to as a net.

Several columns 10 are provided on the peripheral wall 9 of the main body 9.
It is erected on b at a circumferential interval. The support column 10 is integrally formed with the peripheral wall 9b by using the same heat-resistant metal plate material as the main body 9. on the other hand,
As shown in FIG. 2, the receiving edge 11 is for receiving and supporting the upper case 8 and is formed in an annular shape corresponding to the planar shape of the main body 9 and is provided on the column 10. ing.

When firing is performed using the box 8 having the above structure, first, a large amount of the ceramic molded bodies M are deposited and accommodated in each box 8, and the boxes 8 are vertically stacked. In that case, since the outer peripheral portion of the bottom portion 9a of the upper box 8 is received by the receiving edge 11 having a wide width inside and outside, it can be easily stacked. Further, in the stacked state, even if the upper box 8 is laterally displaced with respect to the lower box 8, since the state of being kept on the receiving edge 11 is maintained, the stacking posture does not collapse. Further, since each box 8 is reinforced by the receiving edge 11, the shape retention strength becomes relatively large,
In this respect as well, the stacking posture is surely maintained.

Atmosphere gas is supplied to each of the boxes 8 at the time of firing, and the atmosphere gas is supplied to the upper and lower boxes 8 and 8 through the space between the columns 10 of the boxes 8. Will flow into the space between the ceramic molded body M
Act directly on the sedimentary group of. Further, the atmospheric gas hitting the main body peripheral wall 9b of each box 8 flows into the main body 9 through the net 12 of the peripheral wall 9b and permeates the deposition group of the ceramic molded body M. That is, the atmospheric gas supplied from the bottom wall side of the furnace flows into the lowest box 8 through the net 12 of the bottom 9a, and the upper box 8 is lower than the lower box 8. A part of the atmospheric gas that has flown in a large amount in between flows into the interior so that it blows up through the net 12 of the bottom portion 9a and permeates the deposition group of the ceramic molded body M from below.

In this way, with respect to the ceramic molded bodies M deposited and accommodated in each box 8, atmospheric gas flows into the upper surface side thereof, and the net 1 of the main body peripheral wall 9b and the bottom portion 9a.
Since the atmospheric gas flows in from both the lateral direction and the lower side after passing through 2, the atmospheric gas permeates into the inside of the deposition group of the ceramic molded body M and is evenly distributed to each ceramic molded body of the deposition group. Will work.

Next, a second embodiment according to the present invention will be described with reference to FIGS. Here, FIG. 3 is an external perspective view showing the entire structure of the firing box according to the second embodiment, and FIG. 4 is a half sectional view in the use state. 3 and 4, parts and portions that are the same as or correspond to those in FIGS. 1 and 2 are given the same reference numerals.

The box 8 according to the second embodiment has a receiving edge 1
3, the receiving edge 13 at this time extends obliquely outward and upward from the upper end of the column 10, and is lower toward the inside. Also, in the box 8 according to this embodiment, when the ceramic moldings M are accommodated in a large amount and stacked vertically, the outer circumference of the bottom 9a of the upper box 8 is received by the receiving edge 13 of the lower box 8. become. However, in this case, the upper box 8 is located inside the receiving edge 13 because the outer periphery of the bottom 9a thereof is guided along the inclined surface of the receiving edge 13 even if the lateral position is slightly deviated. It will be settled, and the upper box 8 naturally stacks directly on the lower box 8. Therefore, stacking can be easily performed without displacement.

The atmosphere gas supplied to the multi-tiered boxes 8, ... During firing is set so that the atmosphere gas flows between the upper and lower boxes 8,8. There are cases where the vertical interval between the boxes 8 and the position at which the atmospheric gas is blown out due to differences in the height of the boxes 8. However, even in such a case, in the box 8 according to this embodiment, the obliquely projecting receiving edge 13 serves as a guide plate for the atmospheric gas and guides the atmospheric gas between the upper and lower boxes 8. Therefore, a sufficient amount of the atmospheric gas is supplied to the deposition group of the ceramic molded bodies M of each box 8, and the required firing can be performed.

Further, FIG. 5 is a half cross-sectional view of the firing box according to the third embodiment. In addition, the box 8 has a receiving edge 13 on the main body peripheral wall 9b, which is inclined upwardly so as to become lower toward the inner side, and also on the outer periphery of the bottom portion 9a of the main body 9 in the same manner as the receiving edge 13. An inclined contact edge 14 is provided so as to project. Therefore, when the boxes 8 having such a configuration are stacked vertically, the upper box 8
The contact edge 14 of the lower box is received by the receiving edge 13 of the lower box 8 and overlaps each other, and the stacking posture of the upper and lower boxes 8, 8 is more firmly maintained by the overlapping of the receiving edge 13 and the contact edge 14. It will be.

Although all of the above-mentioned embodiments show a circular box, it is needless to say that the box may be a square box depending on the shape of the furnace chamber of the firing furnace. However, if it is circular, there is no directivity at the time of stacking, and there is an advantage that stacking becomes easy.

[0024]

As described above, according to the box according to the present invention, even when a large amount of ceramic compacts are deposited and accommodated inside, a sufficient amount of atmospheric gas is supplied to the deposit group. It is possible to obtain the effect that the atmospheric gas can be spread over the entire area. When the boxes are stacked, the upper box is received by the inner and outer edges of the lower box, which not only facilitates the stacking work, but also keeps the horizontal direction between the upper and lower boxes in a stacked state. Even if the position is displaced, the receiving edge keeps the mounted state, and as a result, the stacking posture does not collapse.

Furthermore, since each of the boxes is reinforced by the upper receiving edge, it is possible to reduce the weight and to stabilize the stacking posture.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing the overall structure of a firing box according to a first embodiment.

FIG. 2 is a half sectional view in the use state.

FIG. 3 is an external perspective view showing the overall structure of the firing box according to the second embodiment.

FIG. 4 is a half sectional view in the use state.

FIG. 5 is a half cross-sectional view of the firing box according to the third embodiment in a used state.

FIG. 6 is an external perspective view showing an overall structure of a firing box according to a conventional example.

FIG. 7 is an external perspective view showing the overall structure of a firing box according to another conventional example.

FIG. 8 is an external perspective view showing the overall structure of a firing box according to still another conventional example.

[Explanation of symbols]

 8 Box 9 Main Body 9a Bottom 9b Peripheral Wall 10 Strut 11 Receiving Edge 12 Heat-Resistant Metal Net (Reticulated Body) 13 Receiving Edge 14 Contact Edge M Ceramic Molded Body

Claims (3)

[Claims] 1. A firing box that accommodates a large number of ceramic compacts and is stacked in multiple stages in a firing furnace, comprising a main body having a peripheral wall over the entire circumference, and one main wall and a bottom portion of the main body, respectively. Some or all of them are breathable by a net, several columns are erected at intervals on the peripheral wall of the main body, and a receiving edge for receiving the upper case is provided on these columns. A sagger for firing, which is characterized by 2. The sagger for firing according to claim 1, wherein the receiving edge is inclined so as to have an upwardly widening shape which becomes lower toward the inside. 3. The outer periphery of the bottom portion of the main body is provided with a projecting edge that is inclined upward to correspond to the receiving edge.
Box for baking as described in.