JPH0236875B2 - ATATSUCHIMENTORINGURYONOTEISHOSAYA - Google Patents

Description

[Detailed Description of the Invention] (Purpose of the Invention) When the shape of a baked product is modified or revised, or even in the case of a new product, the attachment ring made of alumina refractory can be used to replace the conventional use. The present invention relates to a firing sheath using an attachment ring for soft porcelain, which enables the firing of products of several different shapes.

(Prior art) Conventionally, the compaction of bone china
As shown in the figure, a down-firing method is used. In the case of hard porcelain firing, this is SK9 to SK13 firing.
Compared to mullite and silica remaining, in the case of bone china, anorthite and β-tricalcium phosphate remain at SK8 to 9, resulting in drastic density changes, rapid vitrification, and Low deformation resistance. For this reason, the desired product shape is obtained by a down-firing method that conforms to the chestnut surface of the shime-firing sheath.
Therefore, it is essential that the main shape of the chestnut surface of the sintered sheath be the same as the product shape.

Thus, when modifying or modifying the shape of the fired product, the shape of the chestnut surface of the firing sheath must also be changed. As a countermeasure to this problem, the conventional method (1) was to manufacture a new sheath with the desired chestnut surface shape, but as shown in Figure 5, the currently used carborundum material, which has excellent fire resistance and durability, A method (2) is adopted in which a fastening sheath 1A made of the same material is provided with an attachment 4 made of the same material. However method (1)
Since the work process starting from the production of the mold for molding the sheath takes a great deal of time and costs, the method (2) above is usually used. In addition, the cost amortization will be applied if the used sheath is disposed of only for the purpose of changing its shape while it still has a useful life remaining.
If the residual value is also taken into consideration, the economic loss will be extremely large.

On the other hand, as shown in Figure 5, the chestnut must be constructed so that it has the same shape as the product, so in order to do this, the top surface of the chestnut is inspected with a gauge, fired, and then the surface is coated. However, since the material of the attachment is the same as that of the sheath, the shrinkage during firing is large, and therefore the distortion during firing is also large. Cracks occur on the tochi surface,
Because defects such as peeling from the horse chestnut surface occurred, regular inspection and repair work was necessary. In addition, since the attachment is attached to the surface of the shimeyaki sheath, peeling off this attachment will damage the top surface of the shimeyaki sheath, making it impossible to attach another attachment. Only different types of products could be shared. Furthermore, a press machine had to be used to form the chestnut, and therefore the cost of the mold for forming the chestnut was enormous.

(Structure of the Invention) The present invention eliminates these drawbacks and provides a product with a desired shape at low cost and easily. The embodiment will be described with reference to FIGS. 6 and 9.
A burning sheath 1 having a shape that approximates the desired product shape (cross-sectional shape) from conventionally used burning sheaths
(1A, 1B), and pour it into a plaster mold that will form a ring with the cross-sectional shape of the gap between the compaction sheath and the product, which will share the slurry of the alumina refractory raw material, and utilize this compaction sheath. The core of the attachment ring 2 (2b, 2d) that has been burned and baked is attached to the burning sheath 1.
Install it in a position that does not match the core of (1A, 1B),
Place product 3 (3b, 3d) and perform compaction. In mass production, the attachment ring 2 is semi-fixedly installed by aligning the core of the attachment ring 2 with the burning sheath 1.

For semi-fixed installation, use a gauge to mark the position of the attachment ring 2 on the firing sheath 1, apply CMC (carboxyl methyl cellulose, organic glue) liquid in several places, and apply welding glaze in between, and do not let it dry. Place the attachment ring 2 according to the mark and fix it with adhesive, then dry it and weld it, or use it as it is for tightening and firing and weld it.

CMC is used for temporary fixing and is used to prevent the attachment ring 2 from shifting during the kiln filling process, and will decompose and burn at the beginning of firing, but the welding glaze will become glued at the firing temperature. Therefore, the position will not shift. Also, since the welding glaze is glassy and weak in strength, if an attachment ring with a shape and size determined empirically to fit the desired product shape is available, it can be done extremely easily and in a short time. Replacement work is possible.

At present, as the taste of ceramic products changes, diversified production methods of a wide variety of products and small quantities are required.
If sheaths of corresponding shapes were to be kept in stock, the number of types and numbers of burning sheaths would be enormous, and as mentioned above, manufacturing them would require an extremely large amount of time and expense. Although a circular ring is described in the embodiment, it is not necessarily limited to a circular ring, and may include an elliptical ring,
The same applies to rings such as rectangular shapes.

(Function of the invention) High accuracy is achieved by pouring the attachment ring 2 installed in alignment with the compaction sheath 1 and the core into a plaster mold of raw material slurry for alumina refractories and compaction using this compaction sheath. The product 3 is placed on top of the attachment ring 2 with the cores aligned, stacked in the required number, placed in a furnace, and fired at a raised temperature to soften the product 3. The product 3 (3b, 3d) of the desired shape is obtained by appropriately following the attachment ring 2 and shrinking. In this case, it is necessary to support it at at least three points (bottom 5, rim 6, edge 7).

An alumina refractory is used for the attachment ring 2, and its coefficient of thermal expansion is 6×10 -6 ℃ ^-1 , and a carborundum refractory is used for the combustion sheath, whose coefficient of thermal expansion is 6× ^{10 -6} ℃ -1. It is 4×10 ^-6 °C ^-1 . When using refractories made of other materials, it is generally desirable that the difference in thermal expansion coefficient be as small as possible. Practically speaking, the difference in expansion coefficient between the attachment ring and the sheath is preferably 3×10 ^-6 °C ^-1 or less.

(Effects of the Invention) By adopting the present invention, the above-mentioned drawbacks can be solved, and several types of attachment rings made of alumina refractories can be made by using the conventionally used burning sheath as is. easily replace,
It is possible to obtain sintered sheaths with several different shapes.
Furthermore, the attachment ring is semi-fixed so that it does not shift in position and a product with a stable shape can be obtained.

Therefore, the types of burning sheaths can be kept to a minimum, and the burning sheaths can be used as many times as they are required, which reduces inventory management and factory management, and makes it easy to produce products with stable shapes. The present invention can improve the yield of the product, and the effects of the present invention on price and production are extremely significant. Furthermore, by pouring the raw material slurry for alumina refractories into a plaster mold, no expensive molds are required for forming the attachment ring.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the product 3a having the shape shown in Fig. 3 before compaction using a compaction sheath 1A designed for compaction, and Fig. 2 is a cross-sectional view of the product 3a having the shape shown in Fig. The cross-sectional view after firing, FIG. 3, shows the shape of the product 3a,
A is a front view, and B is a side and cross-sectional view. Fourth
Figures A and B show the shape of another product 3b, where A is a front view, B is a side view and a sectional view, and Figure 5 is a
Fig. 6 is a cross-sectional view of the product 3b shown in Fig. 4 after it has been sintered using the sheath 1A shown in the figure, and the attachment ring 2b of the present invention.
FIG. Figure 7 is the 8th
Fig. 8 is a cross-sectional view of a product 3c having the shape shown in the figure, which is compacted and fired using the sheath 1B, and Fig. 8 shows a product 3c that is compacted and fired with the sheath 1B; 9 is a side view and a cross-sectional view, and FIG. 9 is a cross-sectional view of products 3d (FIG. 10) with different diameters and curves, which are sintered using the attachment ring 2d using the sheath 1B in FIG. 7. 10A and 10B are a front view and B a side view and a cross-sectional view of a product which has been compacted using the attachment ring 2d. (Explanation of symbols of main parts), 1 (1A, 1B)
...Shining sheath, 2 (2b, 2d)...Attachment ring, 3 (3a, 3b, 3c)...Product, 4
...Tsuke, 5...bottom, 6...rim, 7...edge tip.

Claims (1)

[Claims] 1. A ring-shaped ring having a cross-sectional shape that corresponds to the gap between the product and the sheath to be shared, made of alumina refractory, and capable of being replaced and fitted with its core aligned with the center of the sheath. A firing sheath using an attachment link, characterized by being equipped with an attachment ring.