JPH03251402A - Method of integrally cast-molding chinaware and molding mold therefor - Google Patents

Abstract

PURPOSE:To prevent a pipe part from being clogged by inserting a resilient rubber plug having an outer configuration corresponding to the inner configuration of the pipe part into a pipe part molding place in a molding mold, and then casting slurry into the molding mold. CONSTITUTION:Into a pipe part molding place 22 in a molding mold 2, a resilient rubber plug 1 is inserted. Thereby, between the resilient rubber plug 1 and a mold wall 220, a clearance 32 is defined which is equal to the wall thickness of a body layer of a pipe part 42 to be obtained, and therefore, it is held closely with the peripheral surface of a cylindrical part 12 of the resilient rubber plug 1 in a gypsum mold inner wall part at the pipe end innermost side of stepped parts 221, 222. In the next place, body slurry is cast into the molding mold 2 and, after the body layer adheres thereto, the slurry is discharged therefrom and the resilient rubber plug 1 is removed in a semi-dehydrated state wherein the surface moisture in the body is evaporated sufficiently. The pipe forming part 42 is small in its inner diameter and curved in its shape; however, since the resilient rubber plug 1 exists therein, it never causes any blocks due to the slurry. And, as the resilient rubber plug 1 is comprised of silicone rubber, the resilient rubber plug 1 has no water absorption itself and thus it is excellent in draining and water resistance.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to ceramics having a spout such as pots, pots, oil jugs, etc., or other ceramics in which the body and the pipe are integrated. This invention relates to a method for integrally casting and molding ceramics, and a mold thereof.

[Prior art]

Conventionally, for ceramics having pipe parts such as spouts, a method is known in which ceramic base slurry is cast into a mold and integrally molded (for example, Utility Model Publication No. 58-28815, Japanese Patent Publication No. 58-49246). ).

That is, the mold 8 is made up of a plaster mold consisting of an upper mold 81, a middle mold 82, and a lower mold 83, as shown in FIG.

The body 91 of the ceramic to be obtained by assembling the mold 8
This is for integrally casting the pipe portion 92 and the pipe portion 92.

In order to cast a ceramic green body 9 using the mold 8, as shown in FIG. 9, a slurry of a ceramic green body is first poured into the assembled mold 8. After a certain period of time, the moisture in the slurry is absorbed by the plaster mold, forming a base layer with a certain thickness. Next, the remaining slurry that formed the base layer is drained from the inside of the mold 8. Then, a ceramic hydrogen-containing green body formed from the base layer formed in the mold 8 (usually has a moisture content of 13% on a wet basis).
After being semi-dehydrated to a moisture content of about 1 to 10% by weight) and released from the mold (usually at a moisture content of about 1 to 10% by weight), it is dried and shrunk.

However, since the inner diameter of the tube portion 92 is small,
The pipe portion 92 is blocked by the slurry during pouring (
925). This tendency is particularly noticeable when the first tube section 92 is bent or has a narrow diameter even if it is straight.

Therefore, as shown in FIGS. 10a and 10b, we had no choice but to cast the body part 91 and the pipe part 92 separately,
In addition, it is necessary to carry out a method of casting with great care so as not to block them, and joining the body part 91 and tube part 92 of the separate body molded body at the interface 93 with the same material (base slurry for ceramics). I don't get it. As a result, a green molded body 9 as shown in FIG. 10c is obtained.

[Problem to be solved]

However, the above prior art has a first-order problem.

That is, in the latter method, the body portion 91 and the tube portion 92
The two molded bodies are molded separately, the tube ends are finished molded, and then both molded bodies are joined, which makes two operations complicated, inefficient, and has poor workability. Moreover, if the body part 91 and the tube part 92 are not joined accurately, local shrinkage, cracks, deformation, etc. may occur at the interface 93 in such a case. Therefore, such a boundary surface 9
In case of No. 3, a decrease in strength, non-uniformity in wall thickness, etc. may occur.

The present invention has been made in view of the above-mentioned problems of the conventional art, and the present invention is efficient and has good workability without clogging the pipe portion.
The object of the present invention is to provide a method and a mold for integral casting of ceramics.

[Means for solving problems]

The present application consists of a first invention relating to a cast molding method and a second invention relating to a mold.

A first invention is a method of integrally casting ceramics having a body and a pipe such as a spout using a mold, in which a pipe forming portion of the mold has an inner shape of the pipe. Insert an elastic rubber stopper with an external shape corresponding to the shape, maintain a clearance between the elastic rubber stopper and the mold wall corresponding to the wall thickness of the pipe section to be obtained, and then pour slurry into the mold. Casting.

The present invention provides a method for integrally casting ceramics, characterized in that the elastic rubber stopper is removed after mud removal.

In the first invention, what is most noteworthy is that an elastic rubber stopper having an outer shape corresponding to the inner shape of the tube is inserted into the tube-forming portion of the mold, and the slurry is cast into the mold. It is in.

The tube forming portion is a portion where a tube such as a spout is to be formed. Further, the above-mentioned internal shape refers to the internal shape of the tube portion of the green body formed by casting.

Further, as the elastic rubber stopper, one having an external shape substantially the same as the internal shape is used. Also.

When the elastic rubber stopper is inserted into a tube of a mold, it bends along the tube, and when it reaches a predetermined position, it maintains its shape so as to mold the inner shape of the tube of the molded article. be.

Examples of the material for such an elastic rubber stopper include silicone rubber, urethane rubber, acrylic rubber, and nitrile rubber.

Among these, the above-mentioned silicone rubber in particular has no water absorption, good water drainage, and excellent water resistance, as well as good releasability, moldability,
Excellent precision. Therefore, it has good one-dimensional stability and excellent durability.

Further, the body is a part that forms the main body of ceramics, and is, for example, the main body of containers such as teapots, pots, and oil jugs. Further, the pipe part includes, for example, a curved pipe part with a complicated shape or a straight pipe part, such as the pouring hole of the teapot, pot, etc., and the beak of a ceramic bird.

Further, in the first invention, it is preferable that the elastic rubber stopper has a stepped portion forming a tube end. Further, the mold is preferably a gypsum mold having a stepped portion forming an end.

Next, a second invention is a mold for integrally casting ceramics having a body and a pipe such as a spout, the mold having a body forming part and a pipe forming part. An elastic rubber stopper having an outer shape corresponding to the inner shape of the pipe part is removably inserted into the pipe forming part, and a mold wall is provided between the elastic rubber stopper and the mold wall. An integral casting mold for ceramics characterized by maintaining a clearance equivalent to the wall thickness of the pipe section.

In the second invention, the most noteworthy thing is that the mold has an end forming stepped part and a tube forming part, and the front part forming part has an end forming step corresponding to the inner shape of the tube. An elastic rubber stopper having an outer shape with an attached portion is removably inserted.

The above-mentioned mold is made of dihydrate gypsum containing 0.1% or less of impurities, for example, JISR9111 (Cencora for ceramic molds). ''The two-part body part forming part is a part where the body part is to be formed by a cast molding method. Also,
The above-mentioned tube forming portion has the same meaning as in the above-mentioned first invention.

Further, the elastic rubber stopper having the above-mentioned outer shape has the same meaning as in the first invention.

Moreover, the above-mentioned removable means that it is attached during slurry casting and can be removed after forming the base body.

Further, in the second aspect of the invention, it is preferable that the mold has a stepped portion at one end of the two elastic rubber plugs for forming an end portion. This makes it easy to form a stepped portion at the end of the ceramic.

Moreover, it is preferable that the said mold is a plaster mold.

As a result, the mold has excellent dimensional accuracy and good water absorption.

Further, the elastic rubber stopper is preferably made of silicone rubber. As a result, the elastic rubber stopper does not absorb water, has good drainage, is excellent in water resistance, and has excellent mold release properties, moldability, and precision. Therefore, it has good dimensional stability and excellent durability.

[Action and effect]

In the casting method according to the first invention.

First, the elastic rubber stopper is inserted into the tube forming portion of the mold. Thereby, it is possible to maintain a clearance between the elastic rubber stopper and the mold wall corresponding to the wall thickness of the pipe portion to be obtained. Moreover, the tube end of the front part forming part is simultaneously molded with the elastic rubber stopper. Therefore, by casting slurry of a ceramic base into a mold and removing the slurry, a base molded body having a body and a tube with a constant wall thickness is obtained. after that,
After semi-dehydration to a moisture content of 13 to 20%, preferably 15 to 18%, the elastic rubber stopper is removed from the base molded body.

Therefore, according to the first invention, it is possible to provide an integral casting method that is efficient and has good workability without blocking the pipe portion. Furthermore, according to the present invention, the elastic rubber stopper allows the pipe ends, such as the spout end, to be formed at the same time, thereby eliminating the need for a final molding process for the pipe body.

On the other hand, according to the second invention, the casting method according to the first invention can be easily carried out. A mold can be provided.

[Example] First Example The method and mold for integral casting of ceramics according to this example will be explained with reference to FIGS. 1 to 3.

That is, the mold in this example is a mold 2 for integrally molding ceramics 4 having a body part 41 and a pipe part 42 such as a spout, as shown in the first and FIG. The mold 2 has a body forming part 21 and a tube forming part 22.

Moreover, the inner shape 420 of the tube portion 42 is provided in the tube portion forming portion 22.
An elastic rubber stopper 1 having an outer shape corresponding to the above is removably inserted.

Further, the casting mold includes the elastic rubber stopper 1 and the mold wall 220.
A clearance 32 corresponding to the thickness of the base layer of the tube portion 42 to be obtained is maintained between the two.

The elastic rubber stopper 1 has a main body portion 11 as shown in FIG.
It has an insertion cylindrical portion 12 that protrudes more obliquely downward. The insertion cylindrical portion 12 is made of a curved cylindrical body corresponding to the inner shape 420 of the tube portion 42 . And the elastic rubber stopper 1 is water resistant, releasable, and precise.

Constructed from highly durable silicone rubber.

Further, the mold 2 is constituted by a plaster mold having an inner wall corresponding to the outer shape of the teapot.

Thus, the insertion cylindrical part 12 of the elastic rubber stopper 1 having an outer shape corresponding to the inner shape 420 of the pipe part 42 is inserted into the pipe part forming part 22 .

In addition, a clearance 32 corresponding to the thickness of the base layer of the tube portion 42 to be obtained is maintained between the elastic rubber stopper 1 and the mold wall 220 in the mold 2.

Stepped parts 221 and 222 are formed by a plaster mold at the tube end, and the inner wall of the plaster mold on the innermost side of the tube end is in close contact with an elastic rubber stopper.

Next, a method for integrally casting ceramics 4 using the mold 2 will be described with reference to FIGS. 1 to 3.

First, the elastic rubber stopper 1 is inserted into the tube forming portion 22 of the mold 2 (FIG. 1). This causes a gap between the elastic rubber stopper 1 and the mold wall 220.

A clearance 32 corresponding to the thickness of the base layer of the tube portion 42 to be obtained is maintained, and the outer circumferential surface (the first (Fig. 2) and are held in close contact with each other. Next, the base slurry is poured into the mold 2, and after the base layer is attached, the slurry is drained, and the elastic rubber stopper 1 is removed in a semi-dehydrated state in which the water on the inner surface of the base has sufficiently evaporated. Here, the semi-dehydrated state refers to the state immediately before the lapse rate drying of the substrate, that is, the start of drying shrinkage.

Next, the effects of the three examples will be explained.

In this example, the tube forming portion 2 in the mold 2 is
2, an elastic rubber stopper 1 having an outer shape corresponding to the inner shape 420 of the tube portion 42 is inserted. Further, between the elastic rubber stopper 1 and the mold wall 220, a clearance 32 corresponding to the wall thickness of the tube section 42 to be obtained is maintained, and the first stepped section 221,
It is held in close contact with the elastic rubber stopper 1 at the innermost plaster-shaped inner wall portion of the tube end 222.

Therefore, although the tube-forming portion 42 has a small inner diameter and is curved, it does not become clogged with mud because it has the elastic rubber stopper 1. Furthermore, by pouring slurry into the mold 2 and removing the slurry, the body portion 41 and the tube portion 42 can be integrally cast to have a predetermined wall thickness.

At the same time, the eye ends are also molded. Therefore, the work associated with forming, such as finishing forming of the eye end portion, can be simplified.

In one example, the elastic rubber stopper 1 is.

Since it is made of silicone rubber, the elastic rubber stopper 1 itself does not absorb water, has good water drainage, and has excellent water resistance. Moreover, the elastic rubber stopper 1 has good mold releasability from the base molded body, and is excellent in moldability and precision.

Further, the elastic rubber stopper 1 has good one-dimensional stability, high strength and high elastic force, and therefore has excellent durability.

Therefore, according to this example, it is possible to provide a method for integrally casting a teapot and a mold thereof, which has good workability without blocking the tube portion or requiring finish forming of the tube end portion.

Second Embodiment The casting method and mold according to this example will be explained with reference to FIGS. 4 and 5.

That is, in the second example, a "pot" ceramic 5 is used in place of the teapot ceramic 4 in the first embodiment. Also,
Correspondingly, the shape of the body portion 13 of the elastic rubber stopper 1 and the insertion cylindrical portion 14 protruding diagonally downward from the body portion 1 is approximately the same as the inner shape of the pipe portion 52 which is the spout of the “bot”. −
arranged in a shape. The other configurations were the same as those of the first embodiment. In addition, in the same figure, numeral 51 is a trunk forming part, and 53 is a handle part.

According to this embodiment, as in the first embodiment, the "pot" is integrated so that the pipe part does not get cold, and there is no need to form the end part of the pipe, and the workability is good. A cast molding method and a mold thereof can be provided.

Third Embodiment The casting method and mold according to this example will be explained with reference to FIG. 6.

That is, in this example, the ceramic ware 4 of the elephant, pot, etc. in the first embodiment is replaced with a ``oil jug'' ceramic 6. Correspondingly, the shape of the body portion 15 of the elastic rubber stopper 1 and the insertion cylindrical portion 16 protruding therefrom are approximately the same as the inner shape of the pipe portion 62 which is the spout of the “oil pourer”. transformed into a shape. The other configurations were the same as those of the first embodiment.

In the figure, reference numeral 23 denotes a mold for forming the body portion, 24 denotes a mold for forming the tube portion, and 61 denotes the body body.

Therefore, in this example as well, it is possible to obtain the same effects as in the first embodiment described in (g).

Fourth example Regarding the casting method and molding die according to this example.

This will be explained using FIG.

That is, since the two examples relate to a ceramic duck, the pipe part 42 of the ceramic 4, such as a teapot, in the first embodiment is replaced with a "duck-shaped" beak pipe part 621.

Correspondingly, the insertion column 17 of the elastic rubber stopper 1 is formed into a round rod-like linear shape, similar to the inner shape of a duck's beak. The other configurations were the same as those of the first embodiment.

In other words, the "duck-shaped" figurine 621 in this example has two cylindrical beaks 620 in the vicinity of three heads 622. Therefore, the insertion cylindrical portion 17 of the elastic rubber stopper 1 has a round bar-like linear shape.

In this case, the same effects as in the first embodiment described in section 1 can be obtained.

Fifth Example 5 The casting method according to this example will be explained using FIG. 8.

That is, in the second example, the tube portion 52 of the ceramic pot 5 of the “pot” in the second embodiment is replaced with a tube portion 521 having a petal-shaped opening 520.

In this example, the shape of the two elastic rubber stoppers corresponds to the inner shape of the tube portion 521 and has a molded surface forming the opening 520 thereof (path shown). In other words.

A petal-shaped mold is formed on the elastic rubber stopper near the boundary between the main body portion and the cylindrical insertion portion.

In this example, in addition to obtaining the same effects as in the second example, a petal-shaped opening 520 can be simultaneously formed in the tube portion 521 of the xvA device 5 using an elastic rubber plug. Therefore, finishing of the opening 520 as a tube end is not required.

[Brief explanation of drawings]

To Figure 1/Figure 3 shows the first embodiment, Figure 1 is a sectional view of the casting mold, Figure 2 is a perspective view of the casting mold, and Figure 3 is a sectional view of the casting mold.
The figure is a perspective view of an elastic rubber stopper, and Figures 4 and 6 and 5 are pot molds according to the second embodiment. Figure 4 is a sectional view thereof, and Figure 5 is a perspective view thereof. A cross-sectional view of the “soy sauce pitcher” according to the third embodiment, FIG.
Perspective view of the tube part of the “ceramic duck” according to the example, No. 8
The figure is a perspective view of the tube section of "Boll-J" according to the fifth embodiment.
FIG. 9, FIG. 10a, FIG. 10b, and FIG. 10c show conventional examples. Fig. 9 is a cross-sectional view of a conventional casting mold, Fig. 10a is a cross-sectional view of a pipe section, Job drawing is a cross-sectional view of a body part, and Fig. 10c is a cross-sectional view of a base body after joining in separate molding. . 18. . 1 1 2 1 23. . 21. 22. 32. 48. . Elastic rubber stopper. 3.15. ,,Main part 4.16.17. ,,inserted cylindrical part. Casting mold. Body forming part tube forming part. Clearance of pipe forming part. Ceramic 4 1° body. 42° pipe section. Applicant Noritake Co., Ltd. Agent

Claims (1)

[Claims] (1) In a method of integrally casting a ceramic body having a body and a pipe such as a spout using a mold, the pipe forming portion of the mold includes the pipe. An elastic rubber stopper having an outer shape corresponding to the inner shape of the mold is inserted, and a clearance corresponding to the wall thickness of the pipe to be obtained is maintained between the elastic rubber stopper and the mold wall. A method for integral casting and molding of ceramics, characterized in that slurry is poured into the pot, and after the slurry is removed, the elastic rubber stopper is removed. (2) The ceramic piece according to claim 1, wherein the elastic rubber stopper is an elastic rubber stopper having a stepped part forming the end of the tube, and the mold is a plaster mold having a stepped part forming the end. Casting method. (3) A mold for integrally casting ceramics having a body and a pipe such as a spout, the mold having a body forming part and a pipe forming part; An elastic rubber stopper having an outer shape corresponding to the inner shape of the pipe is removably inserted into the forming part, and a wall thickness of the pipe to be obtained is provided between the elastic rubber stopper and the mold wall. A ceramic one-piece casting mold that is characterized by maintaining a considerable amount of clearance. (4) An integral casting mold for ceramics according to claim 3, which has a stepped portion at one end of the elastic rubber stopper for forming an end. (5) The integral casting mold for ceramics according to claim 3, wherein the mold is a plaster mold having a stepped portion forming an end. (6) An integral casting mold for ceramics according to claim 3, wherein the elastic rubber plug is silicone rubber.