JPH0215363B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method for manufacturing thin ceramics.

``Prior Art'' As shown in Fig. 6, in the casting method for ceramics, the mud is removed after casting, the casting opening is cut, and the mold is released several tens of minutes later. But in this way the thickness
When casting thin ceramics (thin ceramics) of 0.8 mm or less, uneven thickness (sagging) due to poor handling may occur.
Early drying causes cracks and distortions, which causes distortions during firing.

"Problems to be Solved by the Invention" The object of the present invention is to obtain a thin product using a cast molding method with less uneven thickness, less cracking, and less distortion.

``Means for Solving the Problems'' The present invention relates to a thin casting method, in which the lower end of an inverted funnel-shaped gypsum pouring port is connected to the upper end opening of the gypsum mold body, and casting is performed from the same pouring port. After removing mud, the upper end of the casting material layer was slightly separated and deformed inward from the inner peripheral surface of the upper end of the gypsum pouring port before releasing the mold, and then the same material was released from the mold. It is constructed using a thin layer manufacturing method characterized by cutting and removing unnecessary parts of the layer.

``Action'' Therefore, the material is poured into the main body 1 from the inverted funnel-shaped gypsum pouring port 2.
When the mud is poured to the upper end of the casting spout 2 and the mud is drained from the casting spout 2, a thin material layer 3 is formed on the inner surface of the main body 1 and the casting spout 2. Since the material layer 3 in the main body 1 is drained through the inverted funnel-shaped gypsum pouring port 2, phenomena such as uneven thickness and sagging are rare, and the material is concentrated inside the inverted funnel-shaped gypsum pouring port 2. A material layer 3 of relatively uniform thickness is formed inside the body 1 . In this state, if the upper end of the material layer 3 is slightly separated and deformed inwardly toward the center by hand from the inner circumferential surface of the upper end of the casting port 2, the circumference or diameter of the opening end of the material layer 3 becomes small. Become. This eliminates the occurrence of vertical cracks (edge cracks) due to drying of the opening end. and material layer 3
After hardening, it is rotated on a potter's wheel, cut with a blade 4 from the level of the upper opening of the main body 1 as shown in Figure 5, and fired (960°C) to make bisque firing, then glazed and fired at 1350°C. This results in the formation of a thin fetus.

``Example'' The lower end of the inverted funnel-shaped gypsum pouring port 2 shown in FIGS. After pouring the material up to the level of the pouring port 2 and performing casting, when the mud is removed, water is absorbed from the material adhering to the inner surface of the main body 1 and the pouring port 2, forming a plastic casting material layer of 0.8 mm or less. 3 is formed. In this state, the upper end of the casting material layer 3 is pushed inward by hand to slightly separate and deform it inward by a gap t from the inner peripheral surface of the upper end of the casting port 2, as shown in FIGS. 1, 3, and 4. It is something. The gap t does not need to be uniform along the inner periphery of the upper end of the casting port 2. After that, after the material layer 3 is hardened by drying, it is released from the mold, and the material layer 3 is placed on a potter's wheel, rotated, and cut from the upper edge of the main body 1 with a blade 4, which is fired at 960 ° C. to make bisque firing. Furthermore, it can be glazed and fired at 1350℃ to form a thin shell. Thickness of thin fetus is less than 0.8mm,
The opening diameter of the casting hole 2 is 20 to 40 mm for pots and 25 to 60 mm for vases.

``Effects'' Since the present invention is constructed as described above, there is no risk of uneven thickness or edge cracks occurring on the inner surface of the main body 1 when casting and removing mud, improving the production yield and quality of thin molds. be able to.

[Brief explanation of drawings]

Fig. 1 is a front view showing a combination of a plaster mold body and an inverted funnel-shaped gypsum casting spout according to the present invention, Fig. 2 is a front view of another embodiment of Fig. 1, and Fig. 3 is a front view of the casting spout portion. 4 is a plan view of FIG. 3, FIG. 5 is an enlarged view of a cut state, and FIG. 6 is a longitudinal sectional view of a conventional casting method. 1... Gypsum mold body, 2... Reverse funnel-shaped plaster casting opening, 3... Casting material layer.

Claims (1)

[Claims] 1 In the thin casting method, after connecting the lower end of an inverted funnel-shaped gypsum pouring spout to the top opening of the plaster mold body and performing pouring and draining from the same spout, before releasing the mold. The mold is released with the upper end of the casting material layer being slightly separated and deformed inward from the inner circumferential surface of the upper end of the plaster pouring port, and then unnecessary portions of the released material layer are cut and removed. A method for producing thin eggs.