JPH09155833A - Mold for hydraulic inorganic material - Google Patents

Abstract

(57) Abstract: A molded article having excellent dimensional stability, appearance and quality, and excellent appearance quality without bubbles and insufficient filling even with a material having a slump value of 10 cm or less and low fluidity. A mold for a hydraulic inorganic material capable of obtaining the above is provided. A molding die for a hydraulic inorganic material, in which a hydraulic inorganic material is injected into a cavity 13 formed between an upper mold 11 and a lower mold 12 to mold a molded body, A molding material injection port communicating with the cavity 13 is provided,
Also, the upper mold body 11 is made of a material having rigidity.
1 and the lower mold body 121 made of a stretchable cloth material 112 provided on the surface of the upper mold body 111, and the lower mold body 12 made of a rigid material, and the lower mold body 1
21 and a surface mold 122 made of a material having elasticity.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a molding die for a hydraulic inorganic material.

[0002]

2. Description of the Related Art Conventionally, so-called cast molding, in which a hydraulic inorganic material is injected into a cavity of a mold composed of an upper mold and a lower mold, to mold a molded product, has a simple manufacturing process and requires a small equipment cost. Since it is inexpensive, a rubber elastic body is often used alone as the material for this mold, and a method is known in which a hydraulic inorganic material such as cement paste is poured into the cavity to mold.

The hydraulic inorganic material, which is the above-mentioned molding material, is used by being mixed with glass fiber, synthetic fiber or the like for reinforcement. For example, Japanese Patent Application Laid-Open No. 5-345648 discloses
There is described a cast molding method for a cement-based cured product, which can improve the dispersibility of synthetic fibers and obtain a high-strength cement-based cured product.

[0004]

However, in the conventional molding die as described above, in order to obtain a large product, a large amount of rubber material has to be used, so that the manufacturing cost of the molding die is increased. Not only is the cost more expensive and the weight more difficult to handle, but when trying to obtain a large-sized molded product that is deeply decorated, the mold does not easily deform during demolding. There is a problem that peeling and cracks are likely to occur in the molded body.

Further, in order to remove the mold while deforming the molding die made of an elastic material so as not to apply a load to the molded body, the elastic body should be made soft or be made very thin so that it can be deformed manually. However, this method has a drawback that the shape cannot be maintained in the cavity and the dimensional stability of the obtained product is deteriorated.

Further, in the case of a mold made of the above-mentioned conventional elastic material, in the case of a material having high fluidity (slump value of 10 cm or more), the cavity of the mold can be satisfactorily filled, but the strength is high. However, it is impossible to obtain a molded article having excellent durability. It is known that good results can be obtained by using a material having a small W / C in order to solve this problem.
On the other hand, there are problems that the fluidity is impaired, bubbles are generated on the peripheral end surface of the upper surface mold, and the material is insufficiently filled, impairing the appearance of the product.

The present invention has been made by paying attention to the above-mentioned problems, and an object of the present invention is to solve these problems and to provide excellent dimensional stability, appearance and quality. Provided is a molding die for a hydraulic inorganic material, which is capable of obtaining a molded product having excellent appearance quality without bubbles or insufficient filling even if the material has a slump value of 10 cm or less and low fluidity.

[0008]

According to the molding die for hydraulic inorganic material of the present invention as set forth in claim 1, a hydraulic inorganic material is injected into a cavity formed between an upper mold and a lower mold to obtain a molded body. A molding die for a hydraulic inorganic material for molding, wherein an injection port for a molding material communicating with the cavity is provided in the upper mold, and
An upper mold body whose upper mold is made of a material having rigidity, and a lower mold body composed of a stretchable cloth material provided on the surface of the upper mold body, and a lower mold body made of a material having rigidity,
It is characterized in that it is constituted by a surface mold made of an elastic material provided on the surface of the lower mold body.

In the mold for a hydraulic inorganic material according to the second aspect of the present invention, the hydraulic inorganic material is molded into a cavity formed between the upper mold and the lower mold to mold a molded body. A molding die for equipment, wherein the upper die is provided with a molding material injection port communicating with the cavity and an overflow hole, and the upper die and the lower die have rigidity, and an upper die body and a lower die body. The upper mold body and the surface mold made of an elastic material provided on the surface of the lower mold body, and further, a breathable material is provided on the peripheral edge surface of the upper mold body. Characterize.

In the present invention, as the material having rigidity of the upper mold body and the lower mold body, metal materials such as aluminum, iron and stainless steel, plastics such as FRP, glass, ceramics, concrete and gypsum are preferably used. To be

As the stretchable cloth material, for example, a cloth material made of spandex or the like is used.

Natural rubber, urethane rubber, silicone rubber, synthetic rubber or the like is preferably used as the material having elasticity of the upper mold or the lower mold and has a Young's modulus of 1.5.
˜5.0 × 10 ⁻⁴ N 2m ² and thickness 10/15 mm are preferred.

Further, the air-permeable material is preferably an air-permeable material having an open-cell structure, for example, an air-permeable plastic sintered body, an air-permeable porous rubber, a sintered metal, a ceramics sintered body or the like. Can also be used. In order to obtain a molded product with good appearance quality without air bubbles or insufficient filling, the pore diameter of these breathable materials is 10 μm to 100 μm.
Pm is desirable, and if the pore size is smaller than this, good air permeability cannot be obtained, and if it is too large, the molding material is clogged, which is not preferable.

[0014]

According to the molding die for hydraulic inorganic material of the present invention as set forth in claim 1, an upper die body made of a material having rigidity, and an elastic cloth provided on the surface of the upper die body. And a lower die body made of a material having rigidity, and a surface die made of an elastic material provided on the surface of the lower die body.
Since the shape retention of the cavity is excellent, the resulting molded product has excellent dimensional stability.In addition, when the mold is released, the cloth material and surface mold can be easily peeled off after the mold is opened. Even with a large product having a complicated shape and deeply engraved decoration, peeling and cracks do not occur, and a molded product excellent in appearance and quality can be obtained.

In the mold for hydraulic inorganic material according to the second aspect of the present invention, an upper mold body and a lower mold body having an upper mold body and a lower mold body having rigidity, and the upper mold body and the lower mold body. The surface mold of the upper mold is provided with a breathable material on the peripheral end face of the upper mold, so that the cavity has a slump value of 10 cm or less. Even if a material having low fluidity is injected, the air in the cavity is discharged from the air-permeable material on the peripheral edge surface of the surface mold, and a molded product having excellent appearance quality without bubbles or insufficient filling can be obtained. Also, as in the invention described in claim 1, since the shape retention of the cavity is excellent, the obtained molded article has excellent dimensional stability, and the molded article can be easily peeled off from the surface mold. It is possible to obtain a molded article which is free from cracks and has excellent appearance and quality.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION

(Example 1) FIG. 1 is a sectional view showing an example of a molding die for hydraulic inorganic material according to the present invention. In FIG. 1, reference numeral 1 is a hydraulic inorganic material molding die, which comprises an openable upper mold 11 and a lower mold 12. A cavity 13 having an inner surface shape corresponding to the outer surface shape of the molded body to be molded is provided between the upper mold 11 and the lower mold 12. The upper mold 11 and the lower mold 12 can be fixed by a fixing hook 17 when the mold is closed.

The upper mold 11 comprises an upper mold body 111 and a stretchable cloth material 112 provided on the surface thereof. The upper mold body 111 is made of rigid heat-resistant FRP.

The upper mold body 111 is provided with a molding material injection port 14 communicating with the cavity 13 at approximately the center thereof. Further, it is preferable that a hole 15 penetrating upward from the cavity 13 is provided at the end of the upper mold body 111. A cloth material 112 is formed at the inlet 14 and the hole 15.
Is not provided. The lower end of the injection pipe 16 can be inserted into the inlet 14.

The lower die 12 has a two-layer structure of a lower die body 121 and a surface die 122 made of an elastic rubber die placed on the surface thereof. The lower mold body 121 is the upper mold body 1
Manufactured from the same heat resistant FRP material as No. 11.

Next, an example of a mode of using the molding die 1 will be described with reference to FIG. First, as shown in FIG. 2A, the mold 1 in the mold closed state is installed on the vibrating table 2. While vibrating the mold 1 with the vibrating table 2, a hydraulic inorganic material such as a cement paste mixed in advance is injected into the cavity 13 through the injection pipe 16 having the lower end portion inserted in the injection port 14. The vibration condition is preferably 100 to 600 VPM.

The cement paste includes, for example, cement, water, and synthetic fibers which are added as necessary.
A mixture of a water reducing agent, silica fume, and an additive such as fly ash is preferably used.

At this time, the cavity 1 is inserted through the hole 15
While the air inside 3 is discharged and the surplus cement paste is discharged, the hydraulic inorganic material is filled to the inside of the cavity 13 up to the details.

Next, with the injection pipe 16 removed,
As shown in FIG. 2B, heating and curing are performed for a certain period of time under high humidity. Then, as shown in FIG. 2C, first, the upper die 11 and the lower die 1 are raised by raising the upper die 11.
The mold 3 is opened and the product 3 is left on the lower mold 11, and the elastic cloth material 112 is peeled off. Next, a molded body 3 as shown in FIG. 3 can be obtained by raising the molded body 3 together with the surface mold 122 with a suitable robot and then peeling off the surface mold 122.

A specific example using the above-mentioned mold for hydraulic inorganic material will be described below with reference to the drawings. To 100 parts by weight of ordinary Portland cement, 40 parts by weight of fly ash and 5 parts by weight of silica fume were added and mixed by a mixer. To this mixture, 36 parts by weight of water, 0.2 parts by weight of methylcellulose, and a water reducing agent containing alkylallyl sulfonate as main components (manufactured by Kao Corporation, trade name "Mighty 15"
0 ") 3 parts by weight were added and mixed in a mixer.

To the mixture, vinylon fiber (fiber length 4 m
m, thickness 1.8 denier) 1.5 parts by weight was added, and the mixture was shaken and mixed by a mixer to uniformly disperse the vinylon fibers to obtain a cement paste. As the above mixer, an omni mixer (capacity: 5 liters) manufactured by Chiyoda Technology Co., Ltd.
Was used.

A molding die 1 having the structure shown in FIG. 1 was used for molding. The mold 1 includes an upper mold body 111 and a lower mold body 12.
1 is made of rigid heat-resistant FRP with a thickness of 7 mm, has outer dimensions of width 600, length 550 mm and height 400 mm, and the stretchable cloth material 121 is a spandex cloth and has elasticity. The surface mold 122 is made of polyurethane rubber (manufactured by Polyurethane Chemicals Co., Ltd.), and the injection pipe is made of SUS having a hole with a hole diameter of 40 mm.

A hydraulic inorganic material is molded by using the above-mentioned cement paste and the molding die 1 according to the process described with reference to FIG. 2, and 8 to 12 at 60 ° C. and 90% RH.
By performing time curing, a molded body 3 as shown in FIG. 3 was obtained.
The obtained molded product was precisely molded with a complex outer surface shape and a deep and sharp pattern, and had a uniform quality without cracks and bubbles.

(Embodiment 2) FIG. 4 is a cross-sectional view showing an example of the hydraulic inorganic material molding die of the present invention according to claim 2.
FIG. 5 is a plan view of FIG. 4 and 5, 1
0 is a hydraulic inorganic material molding die, and this hydraulic inorganic material molding die 10 is composed of an openable upper mold 20 and a lower mold 30, and the upper mold 20 and the lower mold 30 form a molded body. A cavity 10a is formed. The mold 10 for hydraulic inorganic material is placed on the vibrating table 10b.

The upper die 20 is composed of an upper die body 20a made of FRP having rigidity and an upper die side surface die 20b made of urethane rubber having elasticity provided on the surface thereof. Similarly to the upper mold 20, the lower mold body 30a is made of an FRP lower mold body 30a, and an elastic urethane rubber surface mold 30 is provided on the surface of the lower mold body 30a.
b.

The cavity 1 is provided at the substantially central portion of the upper mold 20.
A molding material injection hole 60 communicating with 0a is provided upright.

Reference numeral 80 denotes a breathable material. The breathable material 80 is provided on the peripheral edge surface of the surface die 20b of the upper die 20, and the overflow hole 7 provided in the upper die body 20a.
A hole 81 communicating with 0 is provided.

An example of use of the hydraulic inorganic material molding die 10 is almost the same as that of the above-described Example 1, so a detailed description thereof will be omitted, but a cement paste having a slump value of 10 cm or less is used. In the same manner as in the step described above, a molding material made of the above hydraulic inorganic material is used for molding,
Curing was performed for 8 to 12 hours under the conditions of ° C and 90% RH, and a molded body 10c as shown in Fig. 6 could be obtained.

In the present embodiment, the air in the cavity 10a allows the air permeable material 80 on the peripheral edge surface of the surface mold 20b.
It was possible to obtain a molded product that was more discharged and had excellent appearance quality without bubbles or insufficient filling.

The operation of the above embodiment will be described below with reference to FIG. In FIG. 7, when the molding material is injected through the injection hole 60 (shown in FIG. 4) provided upright in the center of the upper mold 20, the molding material is filled while flowing toward the periphery of the cavity 10a. Go on.

At this time, the air in the cavity 10a passes through the breathable material 80 while being pushed out, and is discharged to the outside from the overflow hole 70 of the upper mold 20. Therefore, even if the molding material has a low fluidity, it is not interfered with by the air staying in the cavity 10a, and the molding material is
The air in the cavity 0a is pressed and completely discharged, and is filled in every corner of the cavity 10a. In addition, the surplus molding material is discharged from the overflow hole 70 of the upper mold body 20a.

In the case of the structure of the conventional molding die, as shown in FIG. 8, the air around the cavity is enclosed in the molding material that has been filled and remains as the air pool a as it is. It was not possible to obtain a molded product with excellent quality, but in the hydraulic inorganic material molding die of the present invention, there is no bubble or insufficient filling and the appearance quality is excellent It was possible to obtain a molded product having a different pattern.

[0037]

In the molding die for hydraulic inorganic material according to the first aspect of the present invention, the upper die body is made of a material having rigidity, and the stretchability provided on the surface of the upper die body. Since the lower mold is composed of a cloth material having a lower mold body made of a material having rigidity and a surface mold made of an elastic material provided on the surface of the lower mold body, The resulting molded product has excellent dimensional stability because of its excellent shape retention property.In addition, when the mold is released, the cloth material and surface mold can be easily peeled off after opening the mold, resulting in a reverse taper. Even with a large product having a complicated shape and deeply decorated decoration, peeling and cracks do not occur, and a molded product having a deep and clear pattern with excellent appearance and quality can be obtained.

In the molding die for hydraulic inorganic material according to the second aspect of the present invention, an upper die body and a lower die body having an upper die and a lower die having rigidity, and the upper die body and the lower die body. The surface mold of the upper mold is provided with a breathable material on the peripheral end face of the upper mold, so that the cavity has a slump value of 10 cm or less. Even if a material having low fluidity is injected, the air in the cavity is discharged from the air-permeable material on the peripheral edge surface of the surface mold, and a molded product having excellent appearance quality without bubbles or insufficient filling can be obtained. Further, as in the invention described in claim 1, since the shape retention of the cavity is excellent, the obtained molded article has excellent dimensional stability, and the molded article can be easily peeled off from the surface mold. It is possible to obtain a molded product which is free from cracks and has excellent appearance and quality.
Therefore, it is suitable as a mold for hydraulic inorganic materials.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a molding die for hydraulic inorganic material according to the first aspect of the present invention.

2A and 2B are explanatory views sequentially showing steps of an example of a mode of use of the hydraulic inorganic material molding die shown in FIG. 1, in which FIG. FIG. (B) is sectional drawing which shows a curing process.
(C) is sectional drawing which shows a mold opening and a mold release process.

FIG. 3 is a front view of the obtained molded body.

FIG. 4 is a cross-sectional view showing an example of the molding die for hydraulic inorganic material of the present invention according to claim 2.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is a perspective view of the obtained molded body.

FIG. 7 is a cross-sectional view of essential parts for explaining the operation of the hydraulic inorganic material molding die shown in FIG. 4.

FIG. 8 is a sectional view of a main part of a conventional molding die for hydraulic inorganic material.

[Explanation of symbols]

 1, 10 Hydraulic inorganic material molding die 10b Shaking table 3, 10c Molded body 11, 20 Upper mold 12, 30 Lower mold 13, 10a Cavity 14 Injection port 111, 20a Upper mold body 112 Stretchable cloth material 121, 30a Lower mold body 122, 20b, 20b Surface mold 60 Injection hole 70 Overflow hole 80 Breathable material 81 hole

Claims (2)

[Claims] 1. A hydraulic inorganic material molding die for molding a molded body by injecting a hydraulic inorganic material into a cavity formed between an upper mold and a lower mold, wherein the upper mold communicates with the cavity. Is provided with an injection port for the molding material, and the upper mold is composed of an upper mold body made of a material having rigidity, and a stretchable cloth material provided on the surface of the upper mold body. A mold for a hydraulic inorganic material, comprising a lower mold body made of a material having rigidity and a surface mold made of an elastic material provided on the surface of the lower mold body. 2. A hydraulic inorganic material molding die for molding a molded body by injecting a hydraulic inorganic material into a cavity formed between an upper mold and a lower mold, the upper mold communicating with the cavity. A mold material injection port and an overflow hole, and an upper mold body and a lower mold body having rigidity, and an upper mold body and a lower mold body, and the upper mold body and the lower mold body. And a surface mold made of an elastic material, and a breathable material is provided on a peripheral edge surface of the upper mold surface mold.