JPH04292903A - Manufacture of thick china and porcelain product - Google Patents

Abstract

PURPOSE:To enable high-precision molding, by a method wherein, after filling of a solid material comprised of china and porcelain raw materials into a bottom force by giving a vibration under a state where the solid material is put within the bottom force, an iron having an inside form of a product is applied to the upper part of the above-mentioned material by pressurizing the same and the china and porcelain product is molded. CONSTITUTION:After obtaining of a cake obtained by dehydrating and conditioning water content of a material comprising of ceramic raw materials to an extent of 18-22% by, for example, with a filter press, the case is extrusion- molded into a cylindrical solid material by a vacuum extruder. Then the solid material 11 cut into fixed sizes is set within bottom force 10 forming an outside form of a product provided on a vibration giving device such as a clay placing machine. The material 11 is filled compactly into the bottom force 10 by vibrating the bottom force 10 under this state. Then the vibration is suspended, a flat iron 12 having an inside form of a product is pressed onto the material 11 and the inside form is made. Then a molded body is taken out from the bottom force 10, drying and firing are performed as in the past and the final product is completed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing ceramic products, and more particularly to a method for manufacturing thick-walled ceramic products.

0002

2. Description of the Related Art Conventionally, when producing a thick and large ceramic product, a large product 21 is divided into a plurality of parts 22-1 to 22-5, as shown in FIG. 4, for example. After producing fired ceramic parts separately, these parts 22-1 to 22-5 were assembled and heat-bonded via adhesive glaze to obtain a final integrated product 21. At this time, in order to obtain each of the ultra-thick parts 22-1 to 22-5, it is impossible to obtain ultra-thick parts by normal press molding, so
Each part was molded using the pour molding method.

0003

[Means for solving the problem] However, although it is possible to obtain a molded body for a large ceramic product using the conventional casting method described above, the following drying and firing steps are required. There were many problems. In other words, molded products produced using the pour molding method have a low density, so shrinkage is large, making it impossible to obtain products with high dimensional accuracy.
Furthermore, it is not possible to obtain a molded product with only low strength, and it takes about 30 days for drying, making it impossible to obtain a final product with high strength and high dimensional accuracy. The problem was that it took too long to get it.

[0004] The purpose of the present invention is to solve the above-mentioned problems,
The object of the present invention is to provide a method for manufacturing thick-walled ceramic products that can produce thick-walled ceramic products with high strength and good dimensional stability in a short time.

[0005]

[Means for Solving the Problems] The method for manufacturing thick-walled ceramic products of the present invention involves placing a solid material made of ceramic raw material extruded by an extruder into a lower mold that forms the external shape of a predetermined product. After applying vibration to the material and filling it into the lower mold, an ultra-thick ceramic product is formed by applying pressure to the top of the material filled in the lower mold with a trowel that forms the inner shape of the product. It is characterized by drying and firing.

[0006]

[Function] In the above-mentioned configuration, the casting method, which has a high water content and is conventionally known as a molding method for obtaining thick-walled ceramic products, is not used, and instead of using a clay casting machine as a vibration imparting means, for example. A solid material for molding made of ceramic raw material extruded from an extruder with a relatively low moisture content is placed in the lower mold to form the external shape of the product and is vibrated. The material for molding can be filled with high density, and the inner shape of the product is molded with a trowel to obtain the final product shape, so it takes about a month compared to the conventional pour molding method. The number of drying days can be shortened to several days. Furthermore, since the density of the molded body can be made denser than that in conventional casting molding, the high dimensional properties and strength of the molded body can be increased.

[0007] The thick-walled ceramic products targeted by the present invention refer to those having a thickness of about 200 mm or more, for example. Further, the vibration of the clay driving machine as the vibration imparting means in the present invention is preferably 50 to 80 mm in amplitude and 28 to 30 vibrations per minute.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a flowchart showing an example of the method for producing thick-walled ceramic products according to the present invention. In the example shown in FIG. 1, first, the moisture content of the ceramic raw material is adjusted to about 18 to 22% by, for example, a filter press to obtain a cake with constant hardness and moisture.
The obtained clay is made into a diameter of 450 mm, for example, by a vacuum extruder.
extrusion molded into a cylindrical solid material. Next, the solid material cut to a predetermined size is set in a lower mold for forming the external shape of the product, which is placed on a vibration imparting means such as a clay driving machine. In this state, the lower mold is preferably moved at an amplitude of 50 to 80 m.
m, and vibrate at a frequency of 28 to 30 times/min to densely fill the material into the lower mold. Next, the vibration is interrupted and a flat trowel is pressed onto the material to create the inner shape. in this case,
Of course, if necessary, the lower mold may be placed on a rotating potter's wheel and pressed while rotating. Thereafter, the molded body is taken out from the lower mold, dried for about 7 days, and then fired under the same temperature and time conditions as conventional ones to obtain a final product.

FIGS. 2(a) and 2(b) are a partial side view and a front view showing the construction of an example of a clay driving machine that applies vibrations used in the method of manufacturing thick-walled ceramic products of the present invention. In FIGS. 2(a) and 2(b), a clay driving machine 3 is obtained by providing a vibrating table 2 on a base 1. The vibration mechanism includes bearings 4-1 and 4 provided at different positions at the bottom of the base 1.
- 2 is rotated by a motor (not shown), and the tip 8 of the vibration shaft 7, which is attached to the vibration table 2 so as to be movable up and down, is driven via a bearing 6 provided at the top of the base 1. It is engaged with a cam 9 of a predetermined shape fixed to the center of the shaft 5 to impart vertical vibration to the vibration table 2. The frequency of vibration in this device can be changed arbitrarily by changing the rotational speed of the drive shaft 5, and the amplitude can be changed arbitrarily by changing the shape of the cam 9. Further, by setting a lower mold on the vibrating table 2 and vibrating it, the method for manufacturing thick-walled ceramic products of the present invention is carried out.

FIGS. 3(a) to 3(c) show that a solid material 11 made of ceramic raw material is actually placed in a lower die 10 and vibrated up and down to form an outer surface shape, and then an inner surface shape is formed using a flat trowel 12. It is a figure which shows each process at the time. First, as shown in FIG.
A solid material 11 is set inside. Thereafter, the lower mold 10 is vibrated up and down to densely fill the solid material 11 into the lower mold 10, as shown in FIG. 3(b). After that, stop the vibration and
As shown in (c), a flat trowel 12 is rotated from the top of the filled material 11 and pressed down to form an inner surface shape, thereby obtaining a final thick-walled product molded body.

[0011] The present invention is not limited to the above-described embodiments, but can be modified and changed in many ways. For example, in the embodiments described above, a clay driving machine was disclosed as an example of a means for applying vibration, but it goes without saying that other devices can be used as long as they can apply vibration to the lower mold.

0012

[Effect of the invention] As is clear from the above explanation,
According to the present invention, clay having a relatively low water content is extruded using a vacuum kneading machine, and a solid material of a predetermined size made of ceramic raw material obtained by extrusion is placed in a lower mold and vibrated to form a product. The outer surface is formed, and then the inner shape of the product is formed by pressure molding with a trowel, and then dried and fired, so the drying time is only a few days, compared to the one month required with the conventional pour molding method. It can be shortened to Furthermore, the density of the molded body can be made denser than that of conventional casting molding, and the dimensional accuracy can also be increased, so that the strength of the molded body can be increased.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the flow of an example of the manufacturing method of the present invention.

FIG. 2(a) is a partial side view showing the configuration of an exemplary clay driving device that provides vibration used in the manufacturing method of the present invention, and FIG. 2(b) is a front view thereof.

FIG. 3(a) is a diagram showing one step of the molding process of the manufacturing method of the present invention, (b) is a diagram showing another step of the molding process of the manufacturing method of the present invention, and (c) is a diagram showing another step of the molding process of the manufacturing method of the present invention. FIG. 3 is a diagram showing another step of the molding step of the manufacturing method of the present invention.

FIG. 4 is a sectional view showing an example of a conventional thick-walled ceramic product.

Claims (1)

[Claims] Claim 1: A solid material made of ceramic raw material extruded by an extruder is placed in a lower mold that forms the external shape of a predetermined product, and after being filled into the lower mold by applying vibration,
A thick-walled ceramic product characterized by forming an ultra-thick ceramic product by applying pressure to the top of the material filled in a lower mold with a trowel that forms the inner shape of the product, and then drying and firing it. Production method.