JPH06328412A - Manufacture of hydraulic inorganic molded procuct - Google Patents

Abstract

PURPOSE:To produce a highly strong molded product by a method wherein bydraulic inorganic product is forced in a cavity, which is formed by clamping a bottom mold having a large number of dewatering holes bored on its molding surface and a top mold, on the molding surface a pouring port and an air forcing port of which are opened on the molding surface of the top mold to dewater and feed air in order to uniformly apply pressure over the whole surface of a shaped matter. CONSTITUTION:A large number of dewatering holes 21 are bored on the molding surface of a bottom mold 2. In a top mold 1, a pouring port 5, which serves both as the pouring port of hydraulic inorganic material 4 and as air forcing port in combination, is provided so as to connect the pouring port 5 with the transportation pipe 41 of the inorganic material 4 and with an air transportation pipe 42 in order to pour material 4 and air by changing over valves 43 and 44. Concretely, after both the molds 1 and 2 are clamped together, firstly by pouring the material 4 through the pouring port, water is sucked through the dewatering holes 21, resulting in obtaining a dehydrate 7. Secondly, air with the required pressure is fed through the pouring port 5 so as to compressingly shape the dehydrate 7. Accordingly, since uniform pressure is applied over the whole surface of the dehydrate 7, dense and uniform highly strong molded matter can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hydraulic inorganic molded product.

[0002]

2. Description of the Related Art Conventionally, the present inventors have proposed a method for molding a molded article having a complicated shape using a hydraulic inorganic molding material containing a hydraulic inorganic material as a main component, such as cement, gypsum and calcium silicate forming material. , A first split mold in which a large number of small holes serving as dehydration holes are already formed in the mold surface, and an elastic sheet having airtightness is provided along the inner wall surface with its peripheral edge integrated.
After the hydraulic inorganic molding material is press-fitted into the mold cavity formed by closing the split mold, a pressurizing medium is press-fitted between the elastic sheet and the inner wall surface of the second split mold to interpose the elastic sheet. A method of compressing the hydraulic inorganic molding material and dehydrating excess water of the hydraulic inorganic molding material in the mold cavity through the small holes of the first split mold to the outside of the mold by suction to shape it into a desired shape. Japanese Patent Application No. 3-310726).

That is, according to this method, in addition to dewatering the water in the hydraulic inorganic molding material by suctioning through the dehydration hole of the first split mold, the water is removed between the second split mold and the elastic sheet. By pressing the pressure medium into the elastic sheet, the elastic sheet swells toward the hydraulic inorganic molding material side in the mold cavity by the pressure medium and uniformly applies pressure to the entire surface of the hydraulic inorganic molding material to form the hydraulic inorganic molding material. It can be compressed to promote dehydration, and a fine shaped article can be obtained.

[0004]

However, in the above method, the elastic sheet has to be along the mold surface of the second split mold and the peripheral edge of the elastic sheet has to be fixed to the second split mold. There is a problem that the structure is complicated, the manufacturing cost is increased, and the maintenance and management of the elastic sheet is complicated, resulting in poor workability.

The present invention provides a molded product having a simple mold structure, capable of uniformly applying pressure to the entire surface of a shaped product, having a small porosity, excellent strength, and excellent appearance. It is an object of the present invention to provide a method for producing a hydraulic inorganic molded product that can be obtained.

[0006]

In order to achieve such an object, the method for producing a hydraulic inorganic molded article according to the invention of claim 1 (hereinafter referred to as "first invention") is Water is introduced into a mold cavity formed by closing a first split mold having a large number of dehydration holes and a second split mold having a hydraulic inorganic molding material injection port and an air pressure inlet opening on the mold surface. After the hard inorganic molding material is press-fitted, by suction, the excess water of the hydraulic inorganic molding material in the mold cavity is dehydrated from the small holes of the first split mold to the outside of the mold to obtain a dehydrated product, and the second split mold is also used. Air was sent into the mold cavity from the air pressure inlet of (1) to compress and shape the dehydrated product into a desired shape.

The invention according to claim 2 (hereinafter, referred to as "second
Inventive)), the method for producing a hydraulic inorganic molded article comprises a first split mold in which a large number of dehydration holes are formed on the mold surface, and a hydraulic inorganic molding material injection port and an air pressure inlet are opened on the mold surface. The mold is formed by closing a second split mold in which a slide portion that is slidable in a direction away from the first split mold is provided in a portion facing one surface of the molded product. After press-fitting the inorganic molding material, the excess water of the hydraulic inorganic molding material in the mold cavity is dehydrated from the small holes of the first split mold to the outside of the mold by suction to obtain a dehydrated product. After sliding in the direction away from the one-piece mold to form a gap between the slide portion and the dehydrated product, air is fed into the gap from the air pressure inlet to compress the dehydrated product into a desired shape. did.

In the above structure, the suction pressure is not particularly limited, but is preferably about -500 mmHg. The air pressure for compression is not particularly limited, but is preferably about 30 kg / cm ² . Further, it is preferable to provide a filter material having extensibility along the inner wall of the first split mold.

The material of the filter medium is a material whose dimensions expand and expand when an external force is applied, and examples thereof include cloth using crimped yarn, porous rubber and the like. The hydraulic inorganic molding material is mainly composed of a hydraulic inorganic material that hardens by hydration reaction such as cement, gypsum, calcium silicate forming material, sand as aggregate, gravel, mineral fiber as reinforcing material, glass fiber, It refers to a material that can be used in the production of general inorganic molded articles to which animal and vegetable fibers, synthetic fibers, semi-synthetic fibers, rapid hardening materials, pigments, etc. are added as necessary.

[0010]

According to the structure of the first invention, first, the first split mold and the second split mold are closed. Then, the hydraulic inorganic molding material is injected from the injection port into the mold cavity formed by this closing. When the extensible filter medium is provided inside the first split mold, the filter medium is also stretched and adheres to the inner wall surface of the first split mold. Therefore, the hydraulic inorganic molding material is injected into a shape along the shape of the inner surface of the mold cavity.

Next, water in the hydraulic inorganic molding material is dehydrated by suctioning through the dehydration hole of the first split mold to obtain a dehydrated product having a desired water content, and then air injection of the second split mold. Air can be sent from the inlet, and the dehydrated product can be compressed from the second split mold side by air pressure to be shaped into a desired shape. Further, according to the configuration of the second invention, after the dehydrated product is obtained in the same manner as in the first invention, the slide portion is slid to form a gap between the dehydrated product and the slide portion, and the air pressure inlet is provided in this gap. It is possible to shape the material into a desired shape by sending air from the same to apply pressure evenly to the entire dehydrated product.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. (Embodiment 1) As shown in FIGS. 1 to 4, a mold A used in this embodiment is composed of an upper mold 1 as a second split mold and a lower mold 2 as a first split mold. In the lower mold 2,
A large number of dehydration holes 21 are formed.

Further, at the joining portion between the upper mold 1 and the lower mold 2,
As shown in FIG. 1, an elastic sheet 3 is provided to enhance airtightness. The elastic sheet 3 is integrated with the lower mold 2 via screws 31. The upper mold 1 is provided with an injection port 5 which also serves as an injection port for the hydraulic inorganic molding material 4 and an air pressure inlet. That is, the injection port 5 is connected to the transportation pipe 41 of the hydraulic inorganic molding material 4 and the transportation pipe 42 of air as shown in FIGS. 2 to 4, and by switching the valves 43 and 44, The inorganic molding material 4 and air can be freely injected into the mold cavity 6.

Then, using this mold A, a hydraulic inorganic material molded body was manufactured as follows. That is, first, as shown in FIG. 2, after the upper mold 1 and the lower mold 2 are closed, the valve 43 is opened, and the valve 44 is closed. Inorganic material 4 was injected as shown in FIG. Next, after sucking through the dehydration hole 21 provided in the lower mold 2 to obtain the dehydrated product 7 as shown in FIG. 3,
As shown in FIG. 4, the valve 43 is closed and the valve 44 is opened, air is blown into the mold cavity 6 from the injection port 5 at a pressure of 30 kg / cm ² , and the dehydrated product 7 is compression-shaped to obtain a desired cement-based material. Molded product 8
Got [Hydraulic inorganic material] Ordinary Portland cement (manufactured by Ube Industries) 100 parts by weight Vinylon fiber (RM182 × 3 mm manufactured by Kuraray Co., Ltd.) 2 parts by weight Water 500 parts by weight

(Embodiment 2) As shown in FIG. 5, the upper die 1 is divided into a slide portion 11 and a fixing portion 12, and the elastic sheet 3 is fixed to the upper die 1 via screws 31. First, using the mold B, the hydraulic inorganic material 4 is injected into the mold cavity 6 from the injection port 5 in the same manner as in Example 1 to obtain the dehydrated product 7, and then, as shown in FIG. The slide portion 12 was slid in a direction away from the lower mold 2, that is, upward, to form a space 9 between the slide portion 12 and the dehydrated product 7. Then, the valve 43 is closed and the valve 44 is opened, and air is supplied to 30
The dehydrated product 7 was compression-shaped by feeding it into the void 9 from the injection port 5 at a pressure of kg / cm ² to obtain a desired cement-based molded product.

(Comparative Example 1) As shown in FIG.
A buffer portion 16 into which oil or water as a pressure medium is injected is provided inside, and a large number of small holes 15 are formed from the mold surface 1a toward the buffer portion 16 and the upper mold 1 Using the mold C in which the tip of the injection port 17 for injecting the hard inorganic molding material along the mold surface faces the inside and the mold surface 1a is covered with the elastic sheet 18 made of rubber, Japanese Patent Application No. -31
A desired molded product was obtained in the same manner as in No. 0726.

That is, the hydraulic inorganic material 4 was injected from the injection port 17 into the mold cavity 6 formed by the upper mold 1 and the lower mold 2. Next, after dehydrating the hydraulic inorganic molding material 4 in the mold cavity 3 through the water drain hole 21, the inside of the mold cavity 6 is -5 by suction.
When the pressure reaches 00 mmHg, water as a pressurizing medium is injected into the buffer section 16 from the injection port 19 at an injection pressure of 30 kg / cm ² , and the elastic sheet 18 compresses the dehydrated product 7 in the mold cavity 6. The desired molded product was obtained.

The porosity and bending strength of the molded articles obtained in Examples 1 and 2 and Comparative Example 1 were measured, and the results are shown in Table 1.
It was shown to. The outer size of the mold 1 is 1000 mm x 100
It was 0 mm x 500 mm.

[0019]

[Table 1] As shown in Table 1, according to the method of the present invention, since the elastic sheet which requires a high manufacturing cost is not used, the mold can be simplified and the mold can be manufactured at a cost of less than half. A product having almost the same physical properties can be obtained.
Moreover, the work of attaching and maintaining the elastic sheet is eliminated, and the maintenance cost and workability are improved.

Further, as in the second embodiment, the slide portion 11 is slid to form a space 9 between the slide portion 11 and the dehydrated product 7, and air is pressed into the space 9 to pressurize the dehydrated product 7. By doing so, the dehydrated product 7 as a whole could be uniformly compressed even with a complicated shape. The method for producing a hydraulic inorganic molded product according to the present invention is not limited to the above-mentioned examples. For example, in the above-described embodiment, the hydraulic inorganic molding material 4 and air can be injected from one injection port 5 by switching the valves 43 and 44, but separate injection ports should be provided. It doesn't matter.

[0021]

EFFECTS OF THE INVENTION Since the method for producing a hydraulic inorganic molded article according to the present invention is configured as described above, it is possible to apply a uniform pressure to a material without requiring a complicated device. Therefore, it is possible to obtain a molded product which is dense and has excellent strength and uniform properties. In addition, the maintenance of the device is easy and the workability is excellent.

Further, in the method for producing a hydraulic inorganic molded product according to the second aspect of the present invention, the compressive force of air is more uniformly applied to the entire shaped product, so that even if the molded product has a complicated shape, all parts are dense. Also, there is an effect that a molded product having excellent strength and uniform properties can be obtained.

[Brief description of drawings]

FIG. 1 is a view for explaining a method for producing a hydraulic inorganic molding material according to a first aspect of the present invention, which is a cross-sectional view of relevant parts showing a state where a hydraulic inorganic molding material is injected into the mold cavity of the mold. .

FIG. 2 is a view for explaining the method for producing a hydraulic inorganic molded product according to the first invention, and is a cross-sectional view showing a state where the upper mold and the lower mold are closed.

FIG. 3 is a view for explaining the method for producing a hydraulic inorganic molded product according to the first aspect of the present invention, which is a cross-sectional view showing a state where the hydraulic inorganic molding material is injected into the mold cavity of the mold.

FIG. 4 is a view for explaining the method for producing a hydraulic inorganic molded product according to the first invention, which is a cross-sectional view showing a state in which compressed air is sent into the mold cavity of the mold to compress and shape the dehydrated product. is there.

FIG. 5 is a view for explaining the method for producing a hydraulic inorganic molded product according to the second invention, and is a cross-sectional view showing a state where a hydraulic inorganic molding material is injected into the mold cavity of the mold.

FIG. 6 is a view for explaining the method for producing a hydraulic inorganic molded product according to the second aspect of the present invention, and is a cross-sectional view showing a state in which compressed air is sent into the voids to compress the dehydrated product.

FIG. 7 is a view for explaining a conventional method for producing a hydraulic inorganic molding product, which is a cross-sectional view showing a state where the hydraulic inorganic molding material is injected into the mold cavity of the mold.

[Explanation of symbols]

1 Upper mold (second split mold) 2 Lower mold (first split mold) 4 Hydraulic inorganic molding material 5 Injection port (hydraulic inorganic molding material injection port and pneumatic inlet) 6 Mold cavity 7 Dehydrated product 8 Void 11 Slide Part 21 Dehydration hole

Claims (2)

[Claims] 1. A first split mold in which a large number of dehydration holes are formed in a mold surface and a second split mold in which a hydraulic inorganic molding material injection port and an air pressure inlet are opened on the mold surface. After the hydraulic inorganic molding material is press-fitted into the formed mold cavity, the dehydration product is obtained by dehydrating excess water of the hydraulic inorganic molding material in the mold cavity from the mold through the dehydration hole of the first split mold by suction. In addition to obtaining the above, air is sent into the mold cavity from the air pressure inlet of the second split mold to compress and shape the dehydrated product into a desired shape. 2. A first split mold having a large number of dehydration holes formed in the mold surface, an injection port for a hydraulic inorganic molding material and an air pressure inlet opening in the mold surface, and facing one surface of the molded product. After the hydraulic inorganic molding material is press-fitted into the mold cavity formed by closing the second split mold in which the slide part that is slidable in the direction away from the first split mold is provided, Excess water of the hydraulic inorganic molding material in the mold cavity is dehydrated out of the mold through the dehydration hole of the first split mold to obtain a dehydrated product, and the slide portion is slid in a direction away from the first split mold, After forming a gap between the slide portion and the dehydrated product, air is sent into the gap from the air pressure inlet,
A method for producing a hydraulic inorganic molded article, characterized by compressing the dehydrated product into a desired shape.