JPH0668438B2 - Firing method for long-sized ceramic products - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for firing a hollow large-sized ceramic product such as a porcelain tube.

(Prior Art) A long porcelain molded product such as a porcelain tube has conventionally been erected on a baking table and fired, but in the case of a long porcelain molded product having a height / diameter value of 5 to 8 In the firing process, a bend in which the upper end tilts to one side is likely to occur, and the firing failure due to this bend cannot be ignored.

(Problems to be Solved by the Invention) The present invention solves the conventional problems as described above, and
The present invention has been completed in order to provide a method for firing a long porcelain molded article, which enables firing of a hollow long porcelain molded article having a diameter value of 5 to 8 without causing bending.

(Means for Solving the Problem) The above-mentioned problem is characterized in that a hollow long-sized ceramics molded product is erected vertically around a vertical pillar, and is fired while being supported by Kamitochi that can slide its upper end along the pillar. It is achieved by the firing method of a long-sized ceramics molded article.

Further, by fitting a slide guide having a vertically long tubular portion inside Kamitochi, firing is performed while preventing tilting of the upper ends of Kamitochi and long-sized porcelain molded products, and more preferable results are obtained.

(Example) Next, the present invention will be described in more detail together with the illustrated example.

In FIG. 1, (1) is a hollow large porcelain molded product such as a porcelain tube, and this long large porcelain molded product (1) is a vertical pillar (3) erected on a firing table (2). It stands vertically around and is fired. Kamitochi (5), which can slide vertically along the pillar (3), is fitted to the upper end (4) of the long porcelain molding (1). As shown in FIG. 2, Kamitochi (5) forms a flange portion (7) around a short tubular portion (6) that is a sliding surface with a pillar (3), and the lower surface of this flange portion (7). A circular step portion (8) which engages with the inside of the upper end (4) of the long porcelain molding (1) is formed. The pillar (3) is made of, for example, SiC, and its surface is preferably coated with alumina. Also, Kamitochi (5) is preferably made of SiC. It is to be noted that Kamitochi (5) has a plurality of craters (9) to keep the fire around at the time of firing well, and an appropriate number of craters is also formed on the stand (2) to make the It is preferable to improve the circumference of the fire.

Such Kamitochi (5) is fitted on the pillar (3), and further the stepped portion (8) of Kamitochi (5) is engaged with the upper end (4) of the long porcelain molded article (1). When fired like this, the upper end (4) of the long porcelain molded product (1) is pressed from above by the weight of Kamitochi (5) and moves horizontally by Kamitochi (5) and the pillar (3). Is restricted, it is possible to prevent the occurrence of bending in the firing process. Moreover, since Kamitochi (5) can slide vertically along the pillar (3), it slides downward as the long ceramic ware (1) shrinks by firing, and always the upper end (4) of the long porcelain molding (1). Can be reliably supported.

Moreover, as shown in FIG. 3, if a method is adopted in which a slide guide (10) having a vertically long tubular portion (11) is fitted inside Kamitochi (5) and firing is performed, it is possible to more reliably prevent bending. Can be prevented. As shown in FIG. 4, the slide guide (10) presses the upper surface of Kamitochi (5) against the upper end of a vertically long cylindrical portion (11) having an inner diameter slightly larger than the outer diameter of the pillar (3). A plurality of arms (12) are provided in a projecting manner, and each arm (12) has a structure in which only the tip thereof is bent downward so that the crater (9) of Kamitochi (5) is not blocked. When firing is performed using such a slide guide (10), the slide guide (10) is fired because the vertically long tubular portion (11) is in contact with the outer surface of the column (3) for a considerable length of time. Even if it contracts as it contracts, it does not tilt, and therefore, Kamitochi (5) pressed by the tip of each arm (12) of this slide guide (10) also does not tilt, so Kamitochi ( The horizontal movement of the upper end (4) of the long porcelain molding (1) supported by 5) is more reliably prevented. As a result, as shown in FIG. 3, the slide guide (10)
If firing is carried out using, it is simply Kamitochi (5) as shown in Fig. 1.
It is possible to further reduce the bending of the long porcelain molded product (1) as compared with the case where firing is performed using only.

(Effects of the Invention) As described above, the present invention prevents bending of a long porcelain molded product in the firing step by performing firing while supporting the upper end of the vertically erected long porcelain molded product by Kamitochi. be able to. In addition, if a sliding guide having a vertically long tubular portion is fitted inside Kamitochi to perform firing, it is possible to prevent tilting of Uchitochi, and it is possible to more reliably perform firing while preventing the occurrence of bending. it can. Therefore, the present invention is suitable for the firing of porcelain porcelain and other large porcelain molded articles having a height / diameter value of 5 to 8, and has a great contribution to the industrial development.

[Brief description of drawings]

FIG. 1 is a sectional view showing the firing method of the present invention, FIG. 2 is a partially cutaway perspective view showing Kamitochi used in the firing method, and FIG. 3 is a main part showing a further improved firing method of the present invention. Sectional view, 4th
The figure is a partially cutaway perspective view of a slide guide used for this. (1): Long-sized ceramics molded article, (3): Pillar, (4): Upper end, (5): Kamitochi, (10): Slide guide, (11):
Tubular part.

Claims (2)

[Claims] 1. A Uchitochi (5) capable of vertically standing a hollow long porcelain molding (1) around a vertical pillar (3) and sliding its upper end (4) along the pillar (3). A method for firing a long-sized ceramics molded article, which is characterized by firing while supporting it. 2. The upper end (4) of Kamitochi (5) and a large porcelain molding (1) by fitting a slide guide (10) having a vertically long tubular portion (11) inside Kamitochi (5). The method for firing a long porcelain molded article according to claim 1, wherein the firing is performed while preventing the inclination of the above.