JPH08128789A - Sagger for firing ring-shaped ceramic article - Google Patents

Abstract

PURPOSE: To obtain a sagger enabling safe and sure firing of a large number of ring-shaped ceramic articles. CONSTITUTION: A sagger for firing ring-shaped ceramic articles has a sagger main body 11 on the upper side of which grooves 14 holding the ring-shaped ceramic articles (a) in a plurality arranged laterally in juxtaposition in the direction of thickness are arranged at intervals being equal to or larger than the diameters of the ring-shaped ceramic articles (a), stopper parts 15 each of which is so formed at the position of the end part of the groove 14 of the sagger main body 11 as to be higher in a degree than the groove 14 and recessed parts 16 each of which is so formed in the stopper part 15 as to correspond to the groove 14. The sagger main body 11 has partition wall parts 12 being higher in a degree than the opposite-side parts of the grooves 14, at least on the opposite sides thereof, and protuberant parts 13 being higher in a degree than the other part of the partition wall part 12 and the top of the stopper part 15 are provided in some parts of the partition wall part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring-shaped ceramic firing sheath for introducing a ring-shaped unfired ring-shaped ceramic into a firing furnace for firing.

[0002]

2. Description of the Related Art A ring-shaped ceramic, which is an element body of a ring varistor, a ring condenser, etc., is formed by molding a semiconductor ceramic material, a dielectric ceramic material, etc. into a ring shape, and then introducing the material into a firing furnace at a predetermined temperature. It is obtained by sintering by firing at. In this firing, a ring-shaped ceramic formed on a sheath or a base plate made of zirconia, which is thermally and chemically stable, is placed in a firing furnace and fired.

For example, FIG. 8 shows a state in which a ring-shaped ceramic a is placed on a base plate 1 which is generally used in the past, and the ring-shaped ceramic a is mounted on the base plate 1 having legs 2. Three to four stages are stacked in the thickness direction, which are arranged vertically and horizontally and placed on the base plate 1.

When the ring-shaped ceramic a is placed on such a base plate 1, for example, as shown in FIG. 9, a plate-shaped jig having a through hole 4 having a diameter slightly larger than the outer diameter of the ring-shaped ceramic a. The tool 3 is placed on the base plate 1, the ring-shaped ceramics a are randomly supplied to the upper surface of the jig 3, and the ring-shaped ceramics a are stacked in the through holes 4 of the jig 3. Then, the jig 3 is gently pulled upward, and the ring-shaped ceramics a piled up in the through holes 4 are left on the base plate 1, so that the ring-shaped ceramics a are placed on the base plate 1 as shown in FIG. Put on. Then, the ring-shaped ceramic a is introduced into the firing furnace together with the base plate 1, and the ceramic a is heat-treated and fired. Also, when a tray-shaped sheath is used, basically, as in the case of using the base plate 1, the ring-shaped ceramics a are vertically stacked and stored on the upper surface of the sheath.

[0005]

When the conventional base plate or sheath is used, there are the following problems. First, since the ring-shaped ceramics a are vertically stacked on the base plate 1,
There is a limit to the number of ring-shaped ceramics a that can be placed on the base plate 1, and the number of ring-shaped ceramics a that can be fired is small. Further, since the base plates 1 on which the ring-shaped ceramics a are stacked cannot be stacked, the number of the ring-shaped ceramics a that can be fired also decreases in this respect.

Secondly, when the ring-shaped ceramic a is dropped into the through hole of the jig 3, the ring-shaped ceramic a is subject to impact, so that the ring-shaped ceramic a is easily damaged. Further, the stacked ring-shaped ceramics a are likely to collapse, and in this case also, the ring-shaped ceramics a may be damaged.

Third, the stacked ring-shaped ceramics a
Among them, since the through holes of the ring-shaped ceramic a in the lowest step are closed by the upper surface of the base plate 1, gas such as vapor generated from the binder component contained in the ring-shaped ceramic a during firing is ring-shaped ceramic a. It will stay in the through hole b of a and will not come out. Therefore, the ring-shaped ceramic a
Due to a phenomenon such as an increase in air pressure inside the through hole of the ring-shaped ceramic a
Contact with the atmosphere gas may be blocked, resulting in poor firing.

An object of the present invention is to solve the problems of the conventional base plate, sheath, etc., and to obtain a ring-shaped ceramic firing-like sheath capable of safely and reliably firing a large number of ring-shaped ceramics.

[0009]

In order to achieve the above object, in the present invention, the ring-shaped ceramics a are arranged side by side so that they can be housed in the groove 14, and the ring-shaped ceramics stopped at both ends of the groove 14 are provided. The through hole b of a can be opened on both sides. Further, the ring-shaped ceramic firing sheaths holding the ring-shaped ceramics a can be stacked in multiple stages, and the upper and lower sheaths can be spaced from each other.

That is, in the ring-shaped ceramic firing sheath according to the present invention, the grooves 14 for accommodating a plurality of ring-shaped ceramics a arranged side by side in the thickness direction are arranged on the upper surface at intervals equal to or larger than the diameter of the ring-shaped ceramic a. And a stopper portion 15 formed at an end position of the groove 14 of the sheath body 11 so as to be one step higher than the groove 14, and formed corresponding to the groove 14 of the stopper portion 15. And a concave portion 16 which is

At least both sides of the sheath body 11 are provided with partition wall portions 12 which are higher than both side portions of the groove 14, and a part of the partition wall portion 12 has the partition wall portions 12 of the same. A raised portion 13 is provided which is higher than the other portions and the top of the stopper portion 15. The raised portions 13 are provided at least at both ends or near both ends of the partition wall 12. Further, the heights of the raised portions 13 are equal, and the upper surface thereof is flat. The upper surface of the sheath body 11 is divided into a plurality of work holding portions 17a to 17d by a part of the partition wall portion 12 and the stopper portion 15.

[0012]

In the ring-shaped ceramic firing sheath according to the present invention, the groove 14 for accommodating a plurality of ring-shaped ceramics a arranged side by side in the thickness direction is formed into the ring-shaped ceramic a.
Since the ring-shaped ceramics a are arranged side by side in the groove 14, they can be stored, held, and fired because they are arranged on the upper surface of the disc-shaped sheathing body 11 at intervals of not less than the diameter.
In this case, since there is the stopper portion 15 formed so as to be raised one step higher at the end portion of the groove 14, the ring-shaped ceramics a that are stacked and stored are stably held in a tilted state, and the ring-shaped ceramics a are collapsed or the like. Does not happen. In addition, since the stopper portion 15 is provided with the recessed portion 16 which is formed to be low corresponding to the groove 14, the through holes b of the ceramics a are formed at both ends of the ring-shaped ceramics a arranged side by side. It is opened, and the gas generated from the ring-shaped ceramic a during firing can be surely released to the outside.

At least both sides of the sheath body 11 are provided with partition wall portions 12 which are higher than both side portions of the groove 14, and a part of the partition wall portions 12 has a raised portion. In the case where the sheath ceramic body 13 is provided, even if the sheath main bodies 11 accommodating the ring-shaped ceramics a are stacked in several stages, the raised portions 13 serve as spacers and a gap is formed between the sheath main bodies 11. Therefore, at the time of firing, the ring-shaped ceramic a
It is possible to surely release the gas generated from between the sheath body 11. In order to stack the sheath body 11 stably, the raised portions 13 are provided at least at both ends of the partition wall portion 12 or in the vicinity of both ends thereof, and the heights thereof are equal to each other.
It is desirable that the top surface be flat. Further, the upper surface of the sheath body 11 is partially covered with the partition wall portion 12 and the stopper portion 1.
A ring that can store a large amount of ring-shaped ceramics a without dividing the number of ring-shaped ceramics a that are lined up and stored in one groove 14 into an extremely large number when divided into a plurality of work holding portions 17a to 17d by 5 A sheath for firing the ceramics is obtained.

[0014]

Embodiments of the present invention will now be described specifically and in detail with reference to the drawings. The ring-shaped ceramic firing sheath shown in FIG. 1 is made of a thermally and chemically stable ceramic material such as zirconia, and is composed of a rectangular disc-shaped sheath body 11 as a whole.

The sheath body 11 has parallel partition walls 12 which are elevated on both sides and an intermediate portion, and a stopper portion 15 which is parallel to both ends and the intermediate portion of the sheath body 11 so as to be orthogonal to the partition wall 12. Are formed. An area surrounded by the partition wall 12 and the stopper portion 15 is a substantially rectangular work holding portion 17a to 17d. In the illustrated embodiment, the partition wall portion 12 and the stopper portion 15 allow the sheath body 11 to be formed. Is divided into four work holding portions 17a to 17d.

A plurality of grooves 14 are arranged in parallel to the partition wall portion 12 in the work holding portions 17a to 17d. The grooves 14 have an interval larger than the diameter of the ring-shaped ceramic a to be fired, and the cross section thereof is substantially V-shaped as shown in FIG. In the illustrated embodiment, the sheath body 1
Work holding parts 17a to 17 divided into four upper surfaces
Ten grooves 14 are arranged for each d.

The stopper portions 15 are formed on both end sides of the V groove 14 so as to be orthogonal to the V groove 14. The stopper portion 15 is formed with a recess 16 which is partially lowered to match the positions of both ends of the groove 14. In the illustrated embodiment, the shape of the recess 16 is substantially V-shaped, which is substantially the same as the cross-sectional shape of the groove 14, and the stopper portion 15 composed of the recess 16 and the tops on both sides thereof has the groove 14 as a whole. And the work holding portions 17a to 17 composed of
It is higher than d by about 1/2 of the outer diameter of the ring-shaped ceramic a. Further, the top of the stopper portion 15 is substantially equal to the height of the partition wall portion 12.

At both ends and the central portion of the partition wall portion 12, raised portions 13 which are higher than the other portions of the partition wall portion 12 and the top of the stopper portion 15 are provided. The raised portions 13 have the same height, and their upper surfaces are flat. This raised portion 13 may not be provided at the center of the partition wall portion 12 and may be provided only at both ends or near both ends thereof, and the raised portion 13 does not necessarily have to be provided at the center partition wall portion 12.

The ring-shaped ceramic a to be housed in the ring-shaped ceramic firing sheath is, for example, formed into a ring shape from a powder obtained by dispersing a binder component in ceramic powder or a plastic material. A predetermined number of the ring-shaped ceramics a are stacked in the direction of the central axis, and the ring-shaped ceramics a are arranged side by side on the groove 14. The number of them arranged is such that they can be stored without falling in the groove 14 partitioned by the stopper portion 15 and without being pressed in the thickness direction.

When the ring-shaped ceramics a are arranged side by side in the groove 14 as described above, for example, as shown in FIGS.
Further, as shown in FIG. 5, a predetermined number of ring-shaped ceramics a are skewer-fitted into an alignment rod c made of metal or the like having a smooth surface, and the ring-shaped ceramics a are stored in the groove 14 while being laid sideways. In this case, a jig in which a plurality of comb-shaped alignment rods c are aligned according to the intervals of the grooves 14 is used, and a predetermined number of ring-shaped ceramics a are fitted to each of these alignment rods c. It is advisable to lay down c at the same time so as to accommodate a plurality of ring-shaped ceramics a in a plurality of grooves 14 at the same time.

FIG. 4 shows a portion near the stopper 15 on the end side of the sheath body 11 at this time, and FIG. 5 shows a state near the stopper 15 at the center portion of the sheath body 11 at this time. As is clear from these figures, the stopper part 1
Since the concave portion 16 as described above is provided in 5, the alignment rod c can accommodate the ring-shaped ceramic a in the groove 14 without interfering with the stopper portion 15.

In this way, the alignment bar c is laid sideways to form the groove 14
After the ring-shaped ceramics a are arranged side by side and stored, the alignment rod c is gently pulled out to the right in FIGS. 2, 4 and 5, so that only the ring-shaped ceramics a are left in the grooves 14. After pulling out the alignment rod c, the through holes b at both ends of the ring-shaped ceramic a are not blocked by the stopper portions 15, and most of them are opened by the recesses 16 of the stopper 15.

The ring-shaped ceramic firing sheath containing the ring-shaped ceramic a is stacked in an appropriate number of stages as shown in FIG. 1, and is introduced into a firing furnace to be fired. At this time, the sheath body 11 is vertically spaced by a raised portion 13 provided at a part of the partition wall portion 12. Further, as described above, in the ring-shaped ceramics a stacked side by side, the through holes b at both ends thereof are provided in the stopper portion 1.
It is not blocked by 5, and most of it is opened by the recess 16 of the stopper 15. For this reason,
Gas such as vapor of the binder component generated from the ring-shaped ceramic a during firing is surely discharged from the inside of the through hole b of the ring-shaped ceramic a and further from between the sheath body 11. As a result, the ring-shaped ceramic a can be surely fired, and the ring-shaped ceramic a is not distorted.

6 and 7 show another embodiment of the present invention. In the embodiment shown in FIGS. 1 to 5, the grooves 14 of the work holding portions 17a to 17d are substantially V-shaped.
In the ring-shaped ceramic firing sheath according to the embodiment, the groove 14 is an inverted trapezoid, and in the ring-shaped ceramic firing sheath according to the embodiment of FIG. 7, the groove 14 is rectangular. Further, in the embodiment of FIG. 6, the concave portion 16 of the stopper 15 has the same inverted trapezoidal shape as the groove 14, whereas in the embodiment of FIG.
The recess 16 of the stopper 15 has a substantially V shape different from the groove 14.

In the above embodiment, the work holding portion 17
Although a to 17d are divided into four, a small ring-shaped ceramic firing sheath may have two or one work holding portion. For example, in the case of having one work holding portion 17a, the side portion and the end portion thereof are respectively surrounded by the partition wall portion 12 and the stopper 15, and the raised portion 13 is provided at least at both ends of the partition wall portion 12 or near both ends thereof. Have. Further, in the case of having two work holding portions, the two work holding portions 17a and 17b are the partition wall portion 1 like the work holding portions 17a and 17b in FIG.
2 connected with each other, or the work holding part 17 of FIG.
a, 17c, two work holding parts 17a, 17c
For example, c is connected via the stopper portion 15.

[0026]

As described above, in the ring-shaped ceramic firing sheath according to the present invention, a large number of ring-shaped ceramics a can be easily accommodated and can be stacked in multiple stages during firing. Even if
It is possible to reliably release the gas generated from the ring-shaped ceramic a during firing. Therefore, a ring-shaped ceramic firing sheath capable of holding a large number of ring-shaped ceramics a and simultaneously firing them safely and reliably can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view of a ring-shaped ceramic firing sheath according to an embodiment of the present invention and a ring-shaped ceramic housed therein.

FIG. 2 is a perspective view of an essential part of a corner portion when the ring-shaped ceramic is stored in the ring-shaped ceramic firing sheath according to the embodiment.

FIG. 3 is a vertical cross-sectional front view of a main portion of a ring-shaped ceramic firing sheath according to the embodiment, in which the ring-shaped ceramic is housed and the sheath is stacked.

FIG. 4 is a vertical cross-sectional side view of essential parts near an end portion when the ring-shaped ceramic is housed in the ring-shaped ceramic firing sheath according to the embodiment.

FIG. 5 is a vertical cross-sectional side view of essential parts near the central portion when the ring-shaped ceramic is housed in the ring-shaped ceramic firing sheath according to the embodiment.

FIG. 6 is a vertical cross-sectional front view of a main portion of a ring-shaped ceramic firing sheath according to another embodiment of the present invention in which the ring-shaped ceramic is housed.

FIG. 7 is a vertical sectional front view of a main part of a ring-shaped ceramic firing sheath according to still another embodiment of the present invention in which the ring-shaped ceramic is housed.

FIG. 8 is a perspective view of a conventional ring-shaped ceramic firing base plate on which a ring-shaped ceramic is mounted.

FIG. 9 is a perspective view showing an example of a jig used when placing the ring-shaped ceramic of the base plate for firing the ring-shaped ceramic according to the conventional example.

[Explanation of symbols] 11 sheath body 12 partition wall portion 13 raised portion 14 groove 15 stopper portion 16 stopper concave portion 17a workpiece holding portion 17b workpiece holding portion 17c workpiece holding portion 17d workpiece holding portion a ring-shaped ceramic

Claims (6)

[Claims] 1. A ring-shaped ceramic firing sheath for introducing a ring-shaped unfired ring-shaped ceramic (a) into a firing furnace for firing, and a plurality of ring-shaped ceramic firing sheaths arranged side by side in the thickness direction. Of the disc-shaped sheath body (1) in which the grooves (14) for accommodating the ring-shaped ceramic (a) are arranged on the upper surface with an interval larger than the diameter of the ring-shaped ceramic (a).
1), a stopper portion (15) formed at an end position of the groove (14) of the sheath body (11) so as to be higher than the groove (14), and the groove of the stopper portion (15). A ring-shaped ceramic firing sheath having a recess (16) formed corresponding to (14). 2. The sheath body (1) according to claim 1,
At least on both sides of 1), there is a partition wall portion (12) which is higher than both side portions of the groove (14), and a part of the partition wall portion (12) has a raised portion higher than that. A ring-shaped ceramic firing sheath comprising a portion (13). 3. The ridge (13) according to claim 2.
Is provided at least at both ends of the partition wall portion (12) or in the vicinity of both ends thereof. 4. The ring-shaped ceramic firing sheath according to claim 2 or 3, wherein the raised portions (13) have the same height. 5. A ring-shaped ceramic firing sheath according to any one of claims 2 to 4, wherein the upper surface of the raised portion (13) is flat. 6. The work holding part (17) according to any one of claims 2 to 5, wherein the upper surface of the sheath body (11) is provided with a plurality of work holding parts (17) by a part of the partition wall part (12) and a stopper part (15).
A ring-shaped ceramic firing sheath characterized by being divided into a) to (17d).