JPH0716931B2 - Casting mold for ceramics - Google Patents

Description

The present invention relates to a casting mold for ceramics.

"Prior Art" Ceramic containers such as pots are molded in a gypsum mold as shown in Figs. 3 and 4.

The female mold 101 is composed of a side wall member 102 and a bottom member 103, and constitutes a plaster mold with an upper male mold 104 in the figure, and a ceramic product-shaped cavity 105 is formed on the lower surface of the male mold 104 and the inner surface of the female mold 101. The casting hole 106 formed in the female mold 101 is formed in the space.
Communicate with 105.

A ceramic sludge such as alumina, mullite or cordierite is poured through the casting hole 106. The air existing in the void 105 due to the ceramic poured into the void 105 escapes to the air pool 107 formed on the outer surface of the male mold 104, and the raw material ceramic also flows in.

As shown in FIG. 5, the product made of this gypsum mold has the ceramic adhered to the inner surface of the portion corresponding to the air reservoir 107 and the casting hole 106.
Finish as shown.

[Problems to be Solved by the Invention] When ceramic sludge is poured and solidified, the gypsum mold absorbs its water, and the green of the product shrinks and clings to the female mold 104. Not only is it difficult to remove the green of the bite product, but also when removed, cracks occur in the green, making it impossible to obtain a good green.

[Means for Solving Problems] Therefore, in view of the above circumstances, the present invention covers the male convex portion with a cushioning member such as synthetic resin or silicon, and has rigidity such as gypsum inside thereof. It is configured by including a plurality of constituent members that can be divided.

"Action" When the green of the product solidifies, when the water is absorbed by the mold and bites into the male mold, the cushioning member shrinks accordingly, so that the green of the product can be easily removed from the male mold.

[Example] As shown in Figs. 1 and 2, a female mold 1 is composed of a side wall member 2 made of gypsum and a bottom member 3 made of gypsum. Male 4 is
A container member 5 made of silicon having elasticity and a cushioning function, which is formed in a container shape in contact with the inner surface of the product, and a lid made of hard rubber or silicon having an opening of the container member 5 and a tapered protrusion in the center. The member 6, the filling member 7, 7 and 7 made of gypsum and the buffer member 8 made of hard rubber or silicon between the container member 5 and the lid member 6 around the protrusion of the lid member 6, and the gypsum in the central portion A mold filling member (12). A space 9 for the product is formed between the outer peripheral surface of the male die 4 and the inner surface of the female die 1. Further, a casting hole 10 is formed in the bottom member 3 so as to communicate with the leg portion 11 of the cavity 9 which is a product.

Ceramic sludge, such as alumina, mullite, or cordierite, is introduced from the casting hole 11 to fill the void 9 which is the product. When the green as the product solidifies, even if water is absorbed from the plaster part and the green contracts and bites the male mold 4, the male mold 4 is composed of the cushioning members 5 and 8 having elasticity. The green is easy to remove.

[Advantages of the Invention] As described above, according to the present invention, since the male mold is composed of the elastic buffer member such as synthetic resin or silicon, it can be easily extracted from the male mold, and cracks and the like in the green can be obtained. It does not occur. In addition, since there is no surplus portion that does not become a product as in the conventional case, the post-processing step is eliminated, the processing time is shortened, and the product yield is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a specific embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a vertical sectional view of a conventional gypsum mold, FIG. 4 is a plan view of FIG. FIG. 6 is a vertical cross-sectional view of a conventional gypsum-molded product, and FIG. 6 is a vertical cross-sectional view showing the finished product of FIG. 4 ... Male type 1 ... Female type 5/8 ... Container member, buffer member (buffer member)

Claims (1)

[Claims] 1. A casting mold for ceramics comprising a male mold having a convex portion and a female mold made of gypsum having a concave portion corresponding to the convex portion of the male mold. A casting mold for ceramics, characterized in that the surface of the convex portion is covered with a cushioning member such as synthetic resin or silicon, and internally has a plurality of rigid constituent members that can be divided.