JPH082525B2 - Casting molding method and molding die for ceramics having open hole for decoration - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a casting molding method and a molding die capable of accurately and efficiently manufacturing a ceramic porcelain having an open-hole for decoration that looks good.

[Prior art]

Ordinarily, the decorative watermark hole may be provided in a permeator such as a handle (handle portion) of a coffee cup or a plateau of a fruit platter plate.

That is, the ornamental hole is provided to enhance the design effect of the ceramics and to reduce the weight of the ceramics.

And, the above-mentioned ornamental holes are various shapes such as circular, elliptical,
It has various shapes such as crescent shape, S-shape, and fan shape. Further, the size of the decorative watermark hole is large or small.

In addition to the above-mentioned ceramics, as the above-mentioned ornamental hole, there are a candle candle stand, a hole provided on the lower part (beach) of the plate, and a basket carving of the ceramics.

[Problems to be solved]

However, the above conventional technique has the following problems.

That is, a ceramic is generally manufactured by a method of casting a slurry for forming a ceramic base into a plaster-type forming die to form a green body.

However, in the conventional method, it is difficult to form the portion for forming the decorative watermark hole with a gypsum mold for the following reason.

That is, the decorative watermark hole may have various shapes as described above and the size thereof may be extremely small.
Therefore, in the gypsum mold, a local imbalance of water absorption is caused in each part of the decorative watermark hole forming part, and the shape is likely to collapse. If the shape of the decorative watermark hole forming portion is complicated or extremely small,
The mold release is extremely difficult. In particular, in the plaster mold, it is difficult to form a decorative watermark hole having a raised edge or an inverted taper edge.

Therefore, the above-mentioned ornamental watermark hole must be formed by manual work such as hand engraving after forming the above-mentioned ceramic green body.

However, such manual work is complicated and inefficient. In addition, the watermark hole for decoration by hand is
The size is not uniform and it does not look good.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a casting molding method and a molding die capable of accurately and efficiently manufacturing a ceramic having a decorative open-hole for decoration. To do.

[Means for solving problems]

A first invention of the present application is a method of casting a ceramics having a watermark hole for decoration using a molding die including an upper die and a lower die, wherein the upper die and the lower die both have the same shape. A molding recess for forming a ceramic body excluding the watermark hole by uniting and a through hole formed in the molding recess are provided, and the through hole has an outer shape corresponding to the shape of the watermark hole. According to another aspect of the present invention, there is provided a method for casting and molding ceramics, characterized in that an elastic rubber body having a shape is inserted, then sludge is cast into a molding die, and the elastic rubber body is extracted after sludge is discharged.

What is most noticeable in the first invention is that a through hole is provided in the molding recess, an elastic rubber body having an outer shape corresponding to the shape of the open hole is inserted into the through hole, and then sludge is poured. is there.

The above-mentioned decorative watermark hole means a void portion for decoration of various shapes provided on a handle (handle portion) or a hill of a ceramic.

Examples of the above-mentioned ceramics include a coffee cup, a plate of fruits, a candlestick, and a basket ceramic.

As the elastic rubber body, one having an outer shape substantially the same as the inner shape of the decorative watermark hole is used. It is preferable that the elastic rubber body has a grip portion located outside the through hole and a decorative watermark hole forming portion protruding from the grip portion. This facilitates insertion of the elastic rubber body into the through hole.

In addition, it is preferable to provide a notch (cutout groove) in the elastic rubber body that fits in the mold. As a result, the elastic rubber body does not come off from the molding die due to the pressure of the casting slurry during the casting molding, while the elastic rubber body can be easily pulled out when the molded product is released from the mold.

Further, as the material of the elastic rubber body, there are silicon rubber, urethane rubber, acrylic rubber, nitrile rubber, porous plastic and the like. Of these, the silicone rubber in particular has no water absorption, good drainage and excellent water resistance, as well as excellent releasability, moldability, and precision. Therefore, it has good dimensional stability and excellent durability. Further, when the above-mentioned porous plastic is used, it has water absorbency and is excellent in elasticity, which is convenient for manufacturing a molded product having a large thickness around the decorative watermark hole.

Next, a second invention of the present application is a casting mold for use in the above-mentioned casting method, which is a casting mold for casting ceramics provided with a fancy hole for decoration. And a lower mold, and the upper mold and the lower mold have a molding recess for forming a ceramic body by forming a watermark hole by combining the two, and a through hole formed in the molding recess. Is provided, and an elastic rubber body having an outer shape corresponding to the shape of the open hole is detachably inserted into the through hole.

What is most noticeable in the second invention is that a through hole is provided in the molding recess, and an elastic rubber body having an outer shape corresponding to the shape of the watermark hole is detachably inserted into the through hole.

The molding die is made of gypsum dihydrate containing less than 0.1% of impurities of JIS R9111 (Gypsum for ceramics mold material), for example.
As a result, the mold has excellent dimensional accuracy and good water absorption.

Further, in the above description, detachable means that it can be attached during sludge casting and withdrawn after the green compact has a certain water content.

[Action and effect]

In the first invention relating to the casting method, first, the elastic rubber body is inserted into the through hole of the molding die. This is for forming a base molded body having a decorative watermark hole of substantially the same shape as the outer surface of the elastic rubber body. Then, the slurry of the ceramic base is cast into the mold and drained. As a result, a green compact is obtained in the molding die.

Then, the water content is semi-dehydrated to 13 to 20%, preferably 15 to 18%. Then, the elastic rubber body is pulled out from the green body. As a result, the decorative watermark hole is accurately formed in the portion where the elastic rubber body is arranged. That is,
The ornamental watermark hole can be formed with high precision even if the edge of the ornamental watermark hole is a steep edge or a tapered end portion.

Therefore, according to the first aspect of the present invention, it is possible to provide a casting molding method for a ceramic porcelain that can efficiently manufacture a porcelain having a decorative open-hole.

The green body thus obtained is fired by a conventional method to obtain a ceramics.

On the other hand, according to the second aspect of the casting mold, it is possible to provide a casting mold that can easily carry out the casting method.

〔Example〕

First Embodiment A casting method and a molding die for ceramics according to the present invention will be described with reference to FIGS. 1 to 5.

In this example, the handle portion 11 of the coffee cup 1 is
The invention is intended to be manufactured (see FIGS. 1 and 2).
See figure).

First, as shown in FIGS. 2 to 4, the molding die 3 in this example has a base molded body 9 having a decorative watermark hole 110.
It is for molding (FIG. 1). The molding die 3 has handle portion molding recesses 311 and 321 for forming the green body 9. Then, the handle portion forming recess 3
As shown in FIGS. 4 and 5, through holes 11 and 312 are provided at the positions where the watermark holes are formed, and the elastic rubber member 4 has an outer shape corresponding to the shape of the watermark holes 110 (FIG. 1). Is detachably inserted.

The molding die 3 has an upper die 31 and a lower die as shown in FIG.
Consists of 32.

The upper mold 31 and the lower mold 32 are, as shown in FIG.
Having one. The handle forming recesses 311 and 321 have substantially the same shape as the handle 11 of the coffee cup 1 divided into upper and lower parts.

What should be noted here is that the above-mentioned recess 311,
The 321 is provided with through holes 312 and 322 for inserting the elastic rubber body in the upper center portion thereof. Then, the through holes 312, 322 for inserting the elastic rubber body
Has a substantially three-month shape similar to the decorative watermark hole 110 (FIG. 1).

Further, the upper mold 31 and the lower mold 32 have convex dowels 313 and 324 used for superimposing the two molds, and concave receiving portions 323 and 314 having shapes corresponding to these. Also, the upper mold 31
As shown in FIGS. 3 and 4, through holes 312 are formed in the upper surface 310.
Has a finger insertion part 313 formed on the outer side of. Also, the upper mold 3
1 has a concave step portion 318 between the through hole 312 and the finger insertion portion 313.

As shown in FIG. 5, the elastic rubber body 4 has a grip portion 41.
And an insertion flat portion 42 which becomes a watermark hole forming portion.
The insertion flat portion 42 has a three-month shape that is substantially the same as the shape of the decorative watermark hole. The elastic rubber body 4 is made of silicone rubber which is excellent in water resistance, releasability, precision and durability.

Next, a cast molding method using the molding die 3 and the elastic rubber body 4 will be described with reference to FIGS. 1 to 5.

First, as shown in FIGS. 2 and 3, the upper mold 31 and the lower mold 32 are inserted with the convex dowels 313 and 324 in the concave receiving portions 323 and 314, and are set by superposing them.

Next, a through hole 312 for inserting the elastic rubber body of the molding die 3,
The flat insertion portion 42 of the elastic rubber body 4 is inserted into 322 (FIG. 4).

Next, the slurry injection ports 315, 325 (second
Pour the slurry (not shown) into the recesses 311 and 321 for molding the handle.

Next, after a lapse of a certain time, the sludge is drained to form a green body 9 of a handle portion 11 made of a water-containing green body (usually having a water content of about 13 to 20% by weight on the basis of moisture content) in the forming die 3.

Immediately before releasing the green body 9 from the mold 3, the elastic rubber body 4 is pulled out. As a result, the first
As shown in the figure, a base molded body 9 in which a decorative watermark hole 110 is formed is obtained where the elastic rubber body 4 is inserted.

After that, the green body 9 is attached to the recesses 311 and 32 for forming the handle portion.
Remove from 1. Then, it is dried and shrunk to a semi-dried state (the water content of the green body 9 is about 1 to 10% by weight).
As a result, as shown in FIG.
It is possible to obtain the green body 9 of the handle portion 11 having.

According to this example, the green body 9 is provided with a decorative watermark hole 110.
Can be accurately formed. Moreover, in this forming operation, the elastic rubber body 4 is inserted into the through holes 312, 322 of the molding die 3.
It is an extremely simple operation to attach and detach to and from. Therefore, according to this example, the ceramic green body 9 having the decorative open-hole 110 can be formed accurately and efficiently.

Further, in this example, since the elastic rubber body 4 is made of silicon rubber, the elastic rubber body 4 itself has no water absorption, and also has good drainage and excellent water resistance. Further, the elastic rubber body 4 has good releasability from the green body,
Excellent in moldability and precision. Further, the elastic rubber body 4 has good dimensional stability and high strength and elastic force, and therefore has excellent durability.

The green body 9 of the handle 11 is, as shown in FIG.
Join using common soil. In this way, the green body 9 of the handle 11 thus obtained is fired by a conventional method to obtain a ceramics.

Second Embodiment A casting forming method and a molding die according to this embodiment will be described below.
This will be described with reference to FIGS.

That is, in this example, instead of the coffee cup 1 in the first embodiment, the ceramics of the fruit platter plate 2 having the decorative open hole 210 on the plateau 21 is to be cast and formed. Other configurations are similar to those of the first embodiment.

As shown in FIG. 6, the fruit platter plate 2 includes a main body 20 for assembling fruits and a plateau 21 extending below the main body 20.
Have and.

The raised plate 21 has a curved decorative watermark hole 210.
And a decorative pattern portion 211.

Therefore, a molding die (not shown) is prepared accordingly. The mold comprises an upper mold and a lower mold (see FIG. 2), and elastic rubber body insertion through holes (see FIG. 3) are provided in the upper mold and the lower mold.

Then, an elastic rubber body 5 made of silicone rubber as shown in FIG. 7 is inserted into the through hole. As shown in FIG. 7, the elastic rubber body 5 has a grip portion 51 and a curved insertion portion 52 protruding from the grip portion 51.

Therefore, as in the first embodiment, sludge is poured into the molding die, and then mud is discharged. As a result, as shown in FIG. 6, the base molded body 9 of the fruit serving plate 2 having the decorative open hole 210 on the hill 21 is obtained.

Therefore, according to this example, as in the case of the first example, it is possible to manufacture the ceramic having the decorative watermark hole 210 with high accuracy and efficiency.

[Brief description of drawings]

1 to 5 show the first embodiment, FIG. 1 is a partial side view of a "coffee cup" ceramic, FIG. 2 is a development view of a forming die including an upper die and a lower die, and FIG. Is a plan view of the set mold, FIG. 4 is a sectional view taken along the line AA of FIG. 3, FIG. 5 is a perspective view of an elastic rubber body, and FIGS. 6 and 7 show a second embodiment. 6 is a partial side view of the "fruit platter plate" ceramics, and FIG. 7 is a perspective view of an elastic rubber body. 1 …… “Coffee cup” porcelain, 11 …… Handle, 110 …… Opening hole for decoration, 2 …… “Fruit platter plate” porcelain, 21 …… High ground, 210 …… Opening hole for decoration, 3 …… Molding Mold, 31 …… Upper mold, 32 …… Lower mold, 311,321 …… Concave part for forming handle part, 312,322 …… Through hole, 4,5 …… Elastic rubber body, 9 …… Molding body molding,

Claims (4)

[Claims] 1. A method of casting a pottery with a watermark hole for decoration using a molding die consisting of an upper die and a lower die, wherein the upper die and the lower die are united with each other. And a molding recess that forms the ceramic body excluding the watermark hole,
A through hole is formed in the molding recess, and an elastic rubber body having an outer shape corresponding to the shape of the open hole is inserted into the through hole. A cast molding method for ceramics, characterized in that the elastic rubber body is removed after casting and draining. 2. The method of casting according to claim 1, wherein the elastic rubber body is silicone rubber. 3. A molding die for casting a ceramic porcelain having an ornamental open hole, the molding die having an upper die and a lower die, wherein the upper die and the lower die are formed. Is provided with a recess for molding which forms a ceramic body by excluding the watermark hole by combining the two, and a through hole formed in the recess for molding, and the shape of the watermark hole is formed in the through hole. A cast molding die for ceramics, wherein an elastic rubber body having an outer shape corresponding to is detachably inserted. 4. The casting mold for ceramics according to claim 3, wherein the elastic rubber body is silicon rubber.