JP2985404B2 - Ceramic casting mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic casting mold having a projection for forming a hole.

[0002]

2. Description of the Related Art Ceramics, particularly sanitary ware such as toilet bowls, wash bowls, counters with wash bowls, water tanks, accessories, etc., have holes such as drain holes, water supply ports, fitting mounting holes, and toilet seat mounting holes. There are many products.

As a method for casting ceramics having such an opening, there is a method described in Japanese Patent Application Laid-Open No. 3-43203.

[0004] Hereinafter, the above-mentioned molding method will be described with reference to the case of molding the upper molded body a of the Western style toilet A composed of the upper molded body a and the lower molded body b as shown in FIG.

As shown in FIG. 4, a molding die B is provided with a soft material (elastic material such as silicon rubber) 21 for forming an opening c of an upper molded body a on a molding surface of a lower die 22. When the upper mold 20 is fitted with the lower mold 22, the soft material 21 is configured to be in close contact with the molding surface of the upper mold 20 in a state of being compressed in the axial direction and expanded in diameter. 23 is a soft material mounting bolt.

[0006] With this configuration, the molding space between the upper mold 20 and the lower mold 22 is filled with the slurry, and the inner molding of the upper mold 20 and the lower mold 22 is formed with a predetermined thickness of the inking layer d to form the upper molded body. a
Thereafter, by removing the mold and drying, the molding of the upper molded body a having the opening c can be completed.

Further, the opening c
Can be formed without the need for complicated cutting work, and the yield of products can be improved.

[0008]

However, the molding die B used in the above-described casting method still has the following problems to be solved.

That is, the soft material 21 is deformed by compression as shown in FIG. 5 when the upper mold 20 and the lower mold 22 are matched with each other, so that an opening c having an accurate diameter cannot be obtained. . Further, since the soft material 21 is made of a non-water-absorbing material such as silicone rubber, the formation of the inlaid layer d on the peripheral surface of the soft material 21 in the forming operation of the inlaid layer d forming the upper molded body a And lower mold
It is performed only gradually toward the center from both ends that come into contact with 22. Of the inner peripheral surface of the opening c of the upper molded body a, the moisture content of the central portion of the inlaid portion is high. Cracks) e and peeling are likely to occur.

[0010] The present invention can solve the above-mentioned problems, can form an accurate opening in a molded product, and has a crack.
It is an object of the present invention to provide a ceramic casting mold that does not cause peeling.

[0011]

According to the present invention, a first molding die and a second molding die are combined to form a molding space, and a molding space is formed from either the first molding die or the second molding die. A ceramic casting mold provided with a hard hole forming projection in a protruding state, the tip of the hole forming projection being a non-water-absorbing material part, and the other part being a water-absorbing material part. The present invention relates to a ceramic casting mold.

Further, according to the present invention, the thickness of the non-water-absorbing material portion is set to a half of the thickness of the deposit attached to the peripheral surface of the hole forming projection.
And a support part having one end connected to the non-water-absorbing material part is extended through the water-absorbing material part into the first molding die or the second molding die, and the extended end is formed into the first molding die. The support by the mold or the second mold also has a structural feature.

[0013]

The sludge can be deposited on the entire peripheral surface of the water-absorbing material portion of the hole forming projection, so that the water content near the center of the opening of the molded body is substantially the same as the other portions. be able to. Therefore, in the drying step of the molded body, it is possible to reliably prevent the opening (crack) and peeling from occurring at the opening.

Further, a supporting portion having one end connected to the non-water-absorbing material portion extends through the water-absorbing material portion into the first molding die or the second molding die. Since it is supported by the second mold, the first mold and the second mold are assembled, and the pressing force when pressed is applied to the first mold or the second mold via the non-water-absorbing material portion and the support portion. It can be received by the mold, and pressing force can be prevented from being applied to the water-absorbing material portion. Therefore, breakage of the water absorbing material portion can be effectively prevented.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a casting mold E according to the present invention. The ceramic casting mold E in this embodiment is used for molding the upper molded body a of the Western-style toilet A described with reference to FIG. 3, and the opening c is provided with a toilet seat mounting hole. It is used as

In the present embodiment, the ceramic casting mold E is used.
Has substantially the same basic form as the molding die B in the prior art shown in FIG. 3, as shown in FIG.

That is, the ceramic casting mold E is provided with a hole-forming projection 11 for forming an opening c of the upper molded body a on the molding surface 12a of the lower mold 12 as the second molding die. When the upper mold 10 as the first mold is mated with the lower mold 12 as the second mold, the tip of the hole forming projection 11 is in close contact with the molding surface 10a of the upper mold 10. I have.

With this configuration, the molding space between the upper mold 10 and the lower mold 12 is filled with the slurry, and the inner molding of the upper mold 10 and the lower mold 12 is formed with a predetermined thickness of the inking layer d to form the upper molded body. a
Thereafter, by removing the mold and drying, the molding of the upper molded body a having the opening c can be completed.

The opening c
Can be formed without the need for complicated cutting work, and the yield of products can be improved.

However, the present invention is characterized in that the configuration of the hole forming projections 11 is different from that of the conventional soft material 21 of the molding die B and has the following configuration.

That is, as shown in FIGS. 1 and 2, the hole-forming projection 11 has a water-absorbing material portion 13 having a base end joined to a molding surface 12a of the lower mold 12, and a water-absorbing material portion 13 having the same. And a non-water-absorbing material portion 14 which is continuously provided on the tip end surface.

The water absorbing material 13 is made of the same material as the upper mold 10 and the lower mold 12. In this embodiment, a plaster mold is used.

However, the water-absorbing material 13 may be a continuous porous body formed by mixing an epoxy resin and silica sand.

The non-water-absorbing material portion 14 of the hole forming projection 11 is
The tip of the upper mold 10 which is in close contact with the molding surface 10a penetrates the circular shape part 14a having a thickness of 3 to 7 mm and the water-absorbing material part 13 and is buried in the lower mold 12 at a predetermined depth. And a columnar support portion 14c having a flange portion 14b having a predetermined thickness, and is integrally formed of Teflon resin.

In the above configuration, the thickness of the circular portion 14a of the non-water-absorbing material portion 14 is set to be equal to or less than の of the thickness of the deposit attached to the peripheral surface of the hole-forming projection 11. Forming protrusion
It is desirable from the viewpoint of depositing the slurry uniformly over the entire peripheral surface of the eleventh.

The cylindrical support portion 14c penetrating through the water-absorbing material portion 13 is used to reduce the pressing force applied to the non-water-absorbing material portion 14 when the upper mold 10 and the lower mold 12 are mated. It has a function of transmitting to the lower mold 12 through the 14c and the flange portion 14b to support the lower mold 12, thereby preventing the pressing force from being transmitted to the water-absorbing material portion 13 made of a brittle material as described later. As described above, it is possible to reliably prevent the water-absorbing material portion 13 made of a brittle material from being damaged by the pressing force.

The flange 14b has a notch in a part thereof, and serves to prevent the non-water-absorbing material 14 from dropping off.

The material of the non-water-absorbing material portion 14 may be Teflon. However, the material is not limited to Teflon, and a material that does not generate rust, such as stainless steel, may be used. In particular, a material having low adhesiveness to the molded body a is preferable to prevent deformation at the time of demolding.

The projection 11 for forming a hole may be formed integrally with the lower mold 12. In this case, the molding method is such that after setting the non-water-absorbing material portion 14 in the molding mold of the lower mold 12, a slurry for forming a porous mold is formed in the molding mold (for example, in the case of a plaster mold, a gypsum slurry, a resin mold). In this case, a resin slurry composed of an epoxy resin and silica sand) is injected. After the porous mold forming slurry is cured, the hole forming projections 11 integrated with the lower mold 12 are formed.

Next, a method of casting the upper molded body a using the ceramic casting mold E will be described.

First, as shown in FIG.
And mold is poured into the casting space 26, and the inking operation is performed for a predetermined time.

As shown in FIG. 2, the deposition layer d is formed uniformly over the entire length of the peripheral surface of the upper mold 10, the lower mold 12, and the hole-forming projections 11.
Is formed.

After completion of the inlay, the upper molded body a is removed from the upper mold 10 and the lower mold 12 so that a trace of the hole forming projection 11 is formed as an opening c used as a toilet seat mounting hole. .

[0034]

As described above, the present invention has the following effects.

Since the hole forming projection is hard and does not deform, a hole having an accurate diameter can be formed in the molded body.

The hole forming projection has a water absorbing material,
Since the deposit is made uniformly over the entire length of the peripheral surface of the hole-forming projection, it is possible to prevent the water content in the central portion from being increased, and it is possible to reliably prevent the occurrence of cracks and peeling.

Since the tip of the hole forming projection is made of a hard non-water-absorbing material, the water-absorbing material which is fragile and easily wears does not come into direct contact with the facing mold surface and does not wear.
At the time of molding, the tip of the hole forming projection always comes into close contact with the opposing mold surface, and a hole having an accurate diameter can be formed.

Since the thickness of the non-water-absorbing material portion is not more than 1/2 of the thickness of the deposit attached to the peripheral surface of the projection for forming a hole,
The inlay operation of the peripheral surface of the non-water-absorbing material portion is performed from the first and second molds and the water-absorbing material portion of the hole-forming projection, and an inlaid layer having a substantially uniform moisture content is formed.

A support having one end connected to the non-water-absorbing material portion extends through the interior of the water-absorbing material portion into the first molding die or the second molding die. Since it is supported by the mold, the mold assembly and the pressing force are prevented from being directly transmitted to the water-absorbing material portion, thereby preventing breakage.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a ceramic casting mold according to the present invention.

FIG. 2 is an enlarged sectional view of a main part of the ceramic casting mold.

FIG. 3 is a perspective view of a Western style toilet.

FIG. 4 is a sectional view of a main part of a conventional ceramic casting mold.

FIG. 5 is an enlarged sectional view of a main part of the ceramic casting mold.

[Explanation of symbols]

 E Casting mold for ceramics 10 Upper mold (1st mold) 11 Projection for hole formation 12 Lower mold (2nd mold) 13 Water-absorbing material section 14 Non-water-absorbing material section

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Mitsuru Ida 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Prefecture Totoki Kiki Co., Ltd. (56) References JP-A-2-88454 (JP, A) JP-A-3-43203 (JP, A) JP-A-2-147204 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B28B 1/26

Claims (3)

(57) [Claims] 1. A molding space is formed by combining a first molding die and a second molding die, and a hard hole is formed so as to protrude from one of the first molding die and the second molding die into the molding space. Ceramic casting mold provided with a projection for use, characterized in that the tip of the hole-forming projection is made of a non-water-absorbing material part and the other part is made of a water-absorbing material part. Mold for molding. 2. The ceramic casting according to claim 1, wherein the thickness of the non-water-absorbing material portion is equal to or less than 1/2 of a thickness of a deposit attached to a peripheral surface of the hole forming projection. Mold for molding. 3. A support having one end connected to the non-water-absorbing material portion extends through the water-absorbing material portion into the first molding die or the second molding die. The ceramic casting mold according to claim 1, wherein the ceramic mold is supported by a second mold.