JPH0494903A - Casting method for ceramic ware and molding tool - Google Patents

Abstract

PURPOSE:To prevent a curved tube section by inserting an elastic rubber body of external shape corresponding to the shape of the curved tube section into a curved tube forming section of a molding tool while maintaining a given clearance when the curved tube section is molded and casting slurry into the mold. CONSTITUTION:For instance, in the case of manufacturing a pouring end tube section of a teapot, a molding tool 80 for molding a substrated molded body 9 having a curved tube section 921 forming a pouring end is provided with a curved tube forming section 92. An elastic tube body 1 to be inserted therein is provided with an inserting column section 12 corresponding to the shape of the curved tube section and preferably should be composed of silicone rubber. A molding tool is composed of a gypsum mold. The column section of the rubber body is inserted into the curved section of the molding tool to carry out the molding. A clearance equivalent to the wall thickness of a substrate molded body of the curved tube section is retained between the rubber body 1 and a mold wall, and the column section of the rubber body is adhered to a lower end 805 of the mold wall. Then, substrate slurry is cast into the molding tool, and slurry is disposed after forming the wall, and the rubber body is pulled out in the half-dehydrated state just before the surface water content is sufficiently evaporated to start shrinking. Then, the substrate molded body is released out of the mold and bonded with a body formed separately by means of the same clay and burnt by the conventional procedures.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for casting and molding ceramics having a curved pipe portion, such as a teapot, a heat exchanger, a mixer, etc., and a mold thereof.

[Prior Art] Conventionally, for ceramics having curved pipe parts such as spouts and cape-shaped holes, there has been known a method of pouring ceramic base slurry into a mold and casting it (for example, Jikosho et al. 58-28
No. 815, Special Publication No. 58-49246).

That is, as shown in FIG. 11, a mold 8 for casting a teapot consists of a plaster mold consisting of an upper mold 81, a middle mold 82, and a lower mold 83. Then, the mold 8 is assembled, and a green molded body 9 consisting of a ceramic body 91 and a curved tube forming part 92 is cast.

Further, when casting the ceramic base molded body 9 using the mold 8, as shown in FIG. 11.

First, a slurry of a ceramic base is poured into the assembled mold 8. After a certain period of time has elapsed, the moisture in the slurry is absorbed into the plaster mold, and a green molded body 9 with a certain thickness is formed.Next, the remaining slurry that formed the green body molded body 9 is drained from the inside of the mold 8. muddy Then, after semi-dehydration and mold release (usually moisture content of 1 to 20% by weight on a wet basis) of a ceramic hydrated molded body (usually moisture content of about 13 to 20% by weight on a wet basis) consisting of a green body 9 formed in one mold 8, Dry and shrink to about 10% by weight).

[Issue to be solved] However, the above prior art has a first-order problem.

That is, in the base forming body 9, since its inner diameter is small, the curved pipe forming portion 92 may be blocked by the slurry during the casting (portion indicated by reference numeral 925).

On the other hand, in a heat exchanger having spiral holes (see FIG. 4), etc., it is difficult to cast a curved pipe forming portion having spiral holes. Even if it were possible to form such a curved pipe forming portion, the work would be complicated and inefficient.

The present invention has been made in view of these conventional problems, and aims to provide a method and a mold for casting ceramics, which are efficient and have good workability without clogging the curved pipe section. be.

[Means for Solving the Problem] The present invention consists of an invention relating to a casting molding method and a mold used in this method.

The invention of the casting method is a method of casting ceramics having a curved pipe portion such as a spout or a spiral hole using a mold, in which the curved pipe forming portion in the mold has a shape of the curved pipe portion. An elastic rubber body having an external shape corresponding to the shape is inserted, and a clearance corresponding to the thickness of the base molded body to be obtained is maintained between the elastic rubber body and the mold wall.9 Then, slurry is poured into the mold. A method for casting and molding ceramics, characterized in that the elastic rubber body is removed after the slurry is removed.

The most noteworthy feature of this invention is that an elastic rubber body having an external shape corresponding to the shape of the curved pipe section is inserted into the curved pipe forming section of the mold, and slurry is cast into the mold. be.

The above-mentioned curved tube forming portion refers to a portion where a curved tube portion such as a spout or a spiral hole is to be formed.

Further, the bent pipe portion is a complicated-shaped or spirally curved hole formed in a container such as a two-pot oil jug or the like. In addition, as the cough bend pipe section, 1, for example, a heat exchanger,
There are curved holes or spiral holes formed inside the filter.

Further, as the elastic rubber body, one molded to have an outer shape substantially the same as the shape of the curved pipe portion is used.

The above-mentioned elastic rubber body consists of a plurality of pieces, and these are placed in the mold,
It is preferable that one end portions of the two parts be bonded to each other with an adhesive so that they can be cut off from each other when being removed.

Examples of the material for the elastic rubber body 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 two-dimensional stability and excellent durability. Further, the above-mentioned clearance refers to a space formed between the outer surface of the elastic rubber body and the mold wall, that is, a portion corresponding to the thickness of the green molded body.

Further, in the present invention, it is preferable that the elastic rubber body 2 has a stepped portion at a portion located at the end of the bent tube forming portion. Thereby, a stepped portion can be formed at the end of the ceramic to be obtained. Further, it is preferable that the mold is a 7-gypsum mold.

Next, the casting mold used in the above casting method is a mold for casting ceramics having a curved pipe portion such as a spout and a spiral hole, and the mold has a curved pipe forming portion. An elastic rubber body having an outer shape corresponding to the shape of the curved pipe portion is removably inserted into the curved pipe forming portion, and a space between the elastic rubber body and the mold wall is There is a ceramic casting mold that is characterized by maintaining a clearance equivalent to the wall thickness of the base molded body.

The most noteworthy thing about the casting mold is that the mold has a curved tube forming section, into which an elastic rubber body having an external shape corresponding to the shape of the curved tube section is removably inserted. There is a particular thing.

The above-mentioned mold is made of dihydrate gypsum containing 0.1% or less of impurities, for example, JTSR9111 (Ceramic mold material). As a result, the mold has excellent dimensional accuracy and good water absorption.

Moreover, the above-mentioned "removable" means that it is attached during slurry casting and can be removed after the base molded body reaches a certain moisture content.

[Operations and Effects] In the invention of the cast molding method, first, the elastic rubber body is inserted into the curved pipe forming portion of the mold.

Thereby, a clearance corresponding to the thickness of the base molded body to be obtained is maintained between the outer surface of the elastic rubber body and the mold wall. Therefore, by pouring slurry of a ceramic base into a mold and draining the slurry, a base molded body having a constant wall thickness is obtained. After that, the moisture content is 13-20%, preferably 15-20%.
After semi-dehydration to about 18%, the elastic rubber body is extracted from the base molded body. As a result, a nine-bent tube portion is formed with high precision in the portion where the elastic rubber body was placed.

Therefore, according to this method invention, it is possible to provide a ceramic casting method that is efficient and has good workability without blocking curved pipe parts such as spiral holes.

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

On the other hand, according to the invention of the casting mold, the casting method described above can be easily carried out. A mold can be provided.

[Example] First Example The ceramic casting method and mold according to the present invention will be explained with reference to FIGS. 1 to 3.

In this example, two spout pipe parts for a teapot are manufactured according to the present invention (see Figs. 1 and 2).

First of all, the mold in this example is a mold 80 for molding the base molded body 9 having a curved pipe portion 921 serving as a spout, as shown in the first part, and the mold 80 is used to form a curved pipe. It has a section 92. and.

The bent pipe forming portion 92 has two bent pipe portions 9 as shown in FIG.
An elastic rubber body 1 having an outer shape corresponding to the shape of 21 is removably inserted. Further, the mold 80 has a curved pipe portion 92 between the elastic rubber body 1 and the mold wall 801.
A clearance 922 corresponding to the wall thickness of the base molded body 9 of No. 1 is maintained.

As shown in FIG. 3, the elastic rubber body 1 has two main bodies 11 and an insertion cylindrical part 12 projecting obliquely downward from the two main bodies 11. The insertion cylindrical portion 12 is a curved cylindrical body corresponding to the shape of the bent tube portion 921.

The elastic rubber body 1 is made of silicone rubber that is excellent in water resistance, mold releasability, precision, and durability.

Further, the mold 80 is constituted by a plaster mold having a mold wall 801 corresponding to the outer shape of the green molded body 9 to be obtained.

Next, regarding the casting method using the mold 80,
This will be explained using FIGS. 1 to 3.

First, insert the insertion cylindrical part 12 of the elastic rubber body 1 into the bent tube part 921 of the mold 80 (Fig. 1), thereby creating a space between the elastic rubber body 1 and the mold wall 801. A clearance 922 corresponding to the wall thickness of the base molded body 9 of the curved pipe portion 921 is maintained. At the lower end 805 of the mold wall 801, the inserted cylindrical portion I2 of the elastic rubber body 1 is inserted.
The outer circumferential surface of is held tightly.

Next, the base slurry is poured into the mold 80 from the D direction. After the green body molded body 9 is coated, mud is removed, and the elastic rubber body 1 is placed in a semi-dehydrated state in which moisture on the inner surface of the base body has sufficiently evaporated.
Pull it out in the F direction. Here, the semi-dehydrated state refers to a state immediately before the lapse rate drying of the base molded body 9, that is, the start of drying shrinkage.

Next, the green molded body 9 is taken out from the mold 80.

As shown in FIG. 2, the base molded body 9 obtained in this manner is attached to a body, which is a separately prepared base molded body, with a common soil 92.
3 to join. As a result, a base molded body of 5 [teapot J] is obtained. The green molded body is fired in a conventional manner to form ceramics.

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

In this example, the bent pipe forming portion 9 in the mold 80 is
No. 2, an elastic rubber body 1 having an outer shape corresponding to the shape of the bent pipe portion 921 is inserted.

Further, a clearance 922 corresponding to the thickness of the base molded body 9 to be obtained is maintained between the elastic rubber body 1 and the mold wall 801.

Therefore, although the bent pipe portion 921 has a small inner diameter and is curved, it does not become clogged with mud because it has two elastic rubber bodies. Furthermore, by casting slurry into the mold 80 and draining the slurry, it is possible to cast and form a green body 9 having a single curved pipe portion 921 and having a predetermined wall thickness. As a result, a nine-bent tube portion is formed with high precision in the portion where the elastic rubber body is arranged.

At the same time, the mouth end (the spout end of the pipe) of the bent pipe portion 921 is also formed. Therefore, work such as finishing molding of the first end can be simplified.

In one example, the elastic rubber body l is.

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

Further, the elastic rubber body 1 has good one-dimensional stability, high strength, and high elastic force, so it is excellent in durability.

Therefore, according to this example, the spout pipe part (base molded body 9) of the teapot can be molded with good workability without the curved pipe part being cold and without the need for finishing molding of the pipe end part. .

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 embodiment, instead of the ceramic teapot in the first embodiment, a "heat exchanger" ceramic 7 having a spiral bent tube part 72 is cast and molded. Further, the "heat exchanger" ceramic 7 has a cylindrical main body 71 and a spiral bent tube part 72 formed in the center thereof, as shown in FIG. That is, the bent pipe portion 72 is a portion forming a fluid passage in the heat exchanger. Further, the first main body 71 includes the bent pipe portion 7
This is a curved tube forming part that protects and supports 2.

Correspondingly, as shown in FIG. 5, the elastic rubber body 2 is composed of an upper part 21 and a lower part 22 extending downward from the upper part 21. The elastic rubber body 2 forms the curved tube portion 72 of the ceramic 7 of the "heat exchanger", and thus has a spiral shape that is the same as that shape.

What should be noted here is that the elastic rubber body 2
As shown in the figure, it is divided into two parts approximately in the center, into an upper part 21 and a lower part 22. and,
One end of the upper part 21 and the lower part 22 forms a joint 23 . This joint portion 23 is bonded with a water-soluble adhesive 5.

Further, in the mold (as shown), the elastic rubber body 2 is placed at a position where the curved pipe portion 72 is to be formed. The slurry is then cast into the mold. At this time, the water-soluble adhesive 5 applied to the joint portion 23 is dissolved by the slurry.

After discharging the slurry in the mold, the elastic rubber body 2 is pulled vertically (at this time, the adhesive 5 has already melted in the elastic rubber body 2 as described above, so the elastic rubber body 2 is shown in FIG. As shown, the upper part 21 can be extracted in the direction of entry, and the lower part 22 can be extracted in the direction of B. As a result, a green molded body as a "heat exchanger" ceramic 7 can be obtained as shown in FIG. can.

Therefore, according to the second example, 9
In addition, a "heat exchanger" ceramic 7 having a curved tube section with relatively long spiral holes can be easily and efficiently obtained without blocking the curved tube section.

The ceramic heat exchanger described above can be installed, for example, in a cooler and used as a heat exchanger for cooling.

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

This will be explained using FIGS. 6 to 8.

That is, in this example, the "heat exchanger" ceramic 7 in the second embodiment is replaced with one as shown in FIG.

``Mixer J Ceramics 6 is intended to be molded.

The "mixer" china 6 has an upper curved part 61.

It consists of a lower vertical part 62. Further, the upward curved portion 61 has a bent tube portion 611 as a liquid inlet on the left side and a bent tube portion 612 as a gas inlet on the right side. Further, the lower vertical portion 62 includes a vertical pipe portion 621 for mixing gas and liquid.

Correspondingly, as shown in FIG. 7 and FIG. square part 32
and are formed into a nine-arc shape.

Further, the elastic rubber body 3 has an elongated columnar lower portion 33 for forming the vertical tube portion 621.

As shown in FIG. 7, the left part 31 and the right part 32 each have a tapered part 3 at one end thereof.
11.321. Further, the lower part 33 has a protrusion 331 at its tip, which is one upper end. Then, the taper portions 311, 321 and the protrusion 331 are connected at one location of the joint portion 30 using a water-soluble adhesive 5.
It is glued by.

On the other hand, after the elastic rubber body 3 is placed at a predetermined position in the mold (as shown) in the same way as in the second embodiment, slurry is poured into the mold. At this time, the adhesive 5 is dissolved by the slurry.

After removing mud, the elastic rubber bodies 3 are extracted from the base molded body in three directions, X, Y, and Z, as shown in FIG. 8.

Therefore, in this embodiment, "mixer" ceramics can be obtained relatively easily and efficiently, and the same effects as in the second embodiment described above can be obtained. And the above r mixer”
The ceramic 6 can be used, for example, as a mixer 7 for gas and liquid.

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

This will be explained using FIG. 9 and 1θ diagram.

That is, the "mixer" ceramic 65 of this example is the same as the "mixer" ceramic 6 of the third embodiment described above, except that the lower vertical part 62 is replaced with a gas-liquid mixing part 654 having a spiral hole 655. be.

The above-mentioned "mixer" ceramic 65 is as shown in FIG.
Upper curved part 653 and gas-liquid mixing part 6 extending below it
54 and more. Further, the gas-liquid mixing section 654 has a spiral hole 655 in its center.

The upwardly curved portion 653 has a leftwardly curved tube portion 651 and a rightwardly curved tube portion 652 as a fluid injection hole.

Correspondingly, the lower portion 43 of the second elastic rubber body 4 has a spiral shape similar to the spiral hole 655, as shown in FIG.

Therefore, as shown in FIG. 10, the elastic rubber body 4 has a left part 41 and a right part 42 that are arcuate in shape, corresponding to the shapes of the fluid injection holes 651 and 652. Moreover, the first elastic rubber body 4 has a spiral lower part 43 for forming the spiral hole 43 .

Further, the left portion 41 has a joint portion 40 that is one end portion thereof.
, has a tapered portion 411. Further, the right part 42 and the lower part 43 have vertical end parts 421 and 431 for joining, respectively.

These are then bonded together at the joint portion 40 using a water-soluble adhesive 5.

For cast molding, the elastic rubber body 4 is placed at a predetermined position within the mold. Thereafter, slurry is cast into the mold to form a green body. After two mud removals, the left part 4I, right part 42, and lower part 43 are removed from the three directions X, Y, and Z, respectively, as shown in FIG.

In this example, "mixer" ceramics can be molded relatively easily and efficiently, and gas and liquid can be mixed even better than in the third example. You can get a "mixer" china.

[Brief explanation of drawings]

1 to 3 show the first embodiment, and FIG. 1 is a cross-sectional view of a mold for casting the base molded body of the spout pipe, and FIG.
The figure is an explanatory diagram showing the state in which the above-mentioned base molded body is joined to the body part, Figure 3 is a perspective view of the elastic rubber body, Figures 4 and 5 show the second embodiment, and Figure 4 is a "thermal Figure 5 is a perspective view of the elastic rubber body, and Figures 6 to 8 are perspective views of the ceramic exchanger.
Examples are shown in which Fig. 6 is a cross-sectional view of the "mixer" ceramics, Fig. 7 is a side view of the elastic rubber body, Fig. 8 is a side view of the elastic rubber body when extracted, and Figs. 9 and 10 are 4 examples are shown,
FIG. 9 is a sectional view of the "Mixer" ceramics, FIG. 1O is a side view of the elastic rubber body, and FIG. 11 is a sectional view of a conventional casting mold. 1.2.3.4. ,,elastic rubber body. 500. Adhesive side 6.65. ,, r mixer J ceramics. 7,,,r Heat exchanger"Ceramics 80,,,molding mold 911. Base molded body 92... Bent pipe forming part 921... Bent pipe part Applicant Noritake Co., Ltd. Company Limited Agent
Patent Attorney Yoshiyasu Takahashi V=2! Figure 3: 4 wa Figure 6 Figure 5 Figure 7 Figure 9 Figure 10

Claims (6)

[Claims] (1) Ceramics with curved pipe parts such as spouts and spiral holes,
In the casting method using a mold, an elastic rubber body having an external shape corresponding to the shape of the curved pipe part is inserted into the curved pipe forming part of the mold, and the elastic rubber body and the mold wall are connected. A ceramic casting method characterized by maintaining a clearance equivalent to the wall thickness of the base molded body to be obtained, then pouring slurry into the mold, and removing the elastic rubber body after draining the mud. (2) In the first claim, the elastic rubber body consists of a plurality of bodies, one end of which is bonded with an adhesive in the mold, and configured to be cut from each other when extracted. A ceramic casting method characterized by: (3) The method for casting ceramics according to claim 1, wherein the elastic rubber body is silicone rubber. (4) A mold for casting ceramics having a curved pipe portion such as a spout or a spiral hole, the mold having a curved pipe forming portion; An elastic rubber body having an outer shape corresponding to the shape of the part is removably inserted,
A ceramic casting mold characterized in that a clearance corresponding to the wall thickness of the base molded body to be obtained is maintained between the elastic rubber body and the mold wall. (5) The fourth claim is characterized in that the elastic rubber body is composed of a plurality of bodies, which are bonded at one end with an adhesive in the mold, and are configured to be cut from each other when extracted. Ceramic casting mold. (6) The ceramic casting mold according to claim 4, wherein the elastic rubber body is silicone rubber.