JPS626483B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a hydraulic inorganic molded article.

Conventionally, in order to mold a molded article using a molding material containing a hydraulic inorganic material such as cement, gypsum, or a calcium silicate forming material, for example, a cloth is placed on a mold surface provided with drainage holes, A molding material made of a hydraulic inorganic material, water, fiber reinforcing material, etc. is placed on this cloth and pressed with a mold to form a molded article.

However, when the shape of the molded product becomes a container,
Even if an attempt is made to press it with a mold, almost no pressure is applied to the molding material in the side wall portion parallel to the pressing direction, so almost no dehydration takes place, resulting in a molded product with a high water content in this portion, resulting in poor moldability. There was also a drawback that the mechanical strength of the molded product was low. For this reason, the male mold is made of an elastic body such as rubber, and after press-fitting the molding material into the mold, the male mold is expanded and dehydrated under pressure. However, this method has the disadvantage that the wall thickness of the molded product cannot be determined accurately because it only uses pressurized dehydration due to the expansion of the elastic body.
In addition, conventional pressure dehydration cannot provide sufficient mechanical strength to the molded product.

The present invention eliminates the drawbacks of the conventional methods described above, allows easy dehydration of the molding material forming the side wall even when the molded product is shaped like a container, and improves the mechanical strength of the molded product. It is an object of the present invention to provide a method for producing a hydraulic inorganic material which is excellent in quality and which can also exhibit good mechanical strength in areas susceptible to load and shock during use, such as the bottom of a container-shaped molded product. .

The gist of the present invention is that the male mold is fitted into the opening of the template and can move forward and backward, and the female mold has a large number of drainage holes on the mold surface. is brought into contact with the opening of the female mold to close the male mold and the female mold, a hydraulic inorganic material is injected between the male mold and the female mold, and is sucked from the outside of the female mold to dehydrate the molding material. A method for producing a hydraulic inorganic molded product, characterized in that the molding material is pressed and shaped by advancing a male die, and the shaped material is cured inside or outside the mold. Exists.

Next, the method for manufacturing the hydraulic inorganic molded article of the present invention will be explained in more detail.

Hydraulic minerals are minerals that harden through a hydration reaction, such as cement, gypsum, and calcium silicate forming materials. A hydraulic inorganic molding material is one that contains the necessary amount of water to contribute to the hardening of the hydraulic inorganic material and to provide fluidity within the mold. Fibers, inorganic fibers such as glass fibers, animal and plant fibers, synthetic fibers,
Organic fibers such as semi-synthetic fibers, sand, gravel, etc. as aggregates, other hardening agents, pigments, etc. may be contained.

The molding mold includes a male mold 3 that is fitted from above into an opening 2 provided near the center of the plate surface of the mold plate 1 so as to be able to move forward and backward, and a large number of drainage holes 4 on the mold surface. It consists of a female mold 5 provided with. A material 15 is laid on the mold surface of the female mold 5 to prevent clogging caused by the molding material. The material 15 is made of woven fabric, nonwoven fabric, or the like. The edge of the template 1 is brought into contact with the opening edge of the female die 5, and by closing the male die 3 and the female die 5, a die cavity 6 having a shape almost similar to the shape of the molding object is formed. Ru.

The mold plate 1 is used so that the mold can be closed even when the male mold 3 is slightly retracted. The male mold 3 is provided with a guide hole 7 for injecting the molding material into the mold cavity 6, and the mold cavity 6 is filled with a pump 9 from a molding material storage tank 8 installed outside the mold. The required amount of molding material 10 is fed.

In this way, the edge of the template 1 is brought into contact with the opening edge of the female die 5 to close the male die 3 and the female die 5, and the molding material 10 is placed between the male die 3 and the female die 5. inject,
Next, the molding material 1 is sucked from the outside of the female mold 5.
0 causes dehydration. For this purpose, the female mold 5 is fitted into the suction box 11 from the upper opening thereof, and the air in the suction box 11 is suctioned and discharged through the exhaust pipe 13 by the suction pump 12 to be in a reduced pressure state.
Water that has escaped from the molding material 10 by suction enters the suction box 11 through the drain hole 4, but when a certain amount of water accumulates in the suction box 11, it is discharged from drainage holes provided at appropriate locations within the suction box 11. be done. This suction is applied almost uniformly to the entire mold surface of the female mold 5, so that the entire molding material 10 in the mold is dehydrated almost uniformly, and the molding material 10 containing the moisture necessary for the hydraulic reaction is obtained. becomes. However, when the molded product is in the shape of a container, box, etc., a large load or shock is often applied to the bottom part of the molded product during use, so it is necessary to increase the mechanical strength of the bottom part. Although this is necessary, dehydration from the molding material 10 by suction alone does not necessarily provide a fully satisfactory mechanical strength of the molded product. Therefore, in the present invention, the molding material 10 is pressed and shaped by moving the male die 3 forward. By advancing the male die 3 and pressing the molding material 10, the density of the molded product 14 becomes high in this portion, and the molded product after hardening has high mechanical strength.

The thus obtained molded product 14 may be cured by, for example, opening the mold plate 1 and the male mold 3 and placing the molded product 14 into the female mold 5 at room temperature or in a curing chamber, or by leaving the mold in a curing chamber. It may be taken out and placed at room temperature or in a curing chamber to be cured. 16 is a piston for moving the male type forward or backward; 17
is a piston for moving the template 1 forward or backward.

According to the method of the present invention, water is removed from the molding material in the closed mold by suction from the outside of the female mold, which has a large number of drainage holes, so that water is removed uniformly from almost the entire molding material. dehydration is possible,
This prevents the moldability from being impaired or the mechanical strength from decreasing due to locally high moisture content. In addition, after dehydration is caused by suction as described above, the male die is then advanced to press and shape the molding material, so the area pressed by the male die has a high density. Mechanical strength can be significantly improved. Therefore, when molding objects that are likely to be subjected to loads or shocks during use, such as container-shaped or box-shaped molded objects, pressing this bottom with a male mold can significantly increase the mechanical strength of the bottom. There is an advantage that improved moldings can be formed.

Example A manufacturing apparatus as shown in FIGS. 1 to 3 was used. Portland cement in storage tank 8
A molding material 10 consisting of 100 parts by weight, 25 parts by weight of asbestos fiber, and 500 parts by weight of water is prepared, and the molding material 10 is poured into the mold cavity 6 from the storage tank 8 through the guide hole 7 by the operation of the snake-type pump 9. The material was fed and press-fitted between the material 15 laid on the mold surfaces of the male mold 3 and the female mold 5 at a feeding pressure of 2 kg/cm ³ . After stopping the operation of the pump 9, the water ring type suction pump 12 was operated to suck up to -500 mmHg pressure, and excess water was dehydrated to the amount of water required for the hydraulic reaction in the molding material 10. . Next, the female mold 3 is advanced and the molding material 10 is applied with a pressure of 30Kg/ ^cm3 .
was pressed and shaped to obtain a container-shaped shaped product 14. Next, the template 1 and the male mold 3 were moved back, and the molded material 14 was taken out from the female mold 5 and cured at room temperature for 4 weeks.
hardened. The molded product thus obtained had a bending strength of 157 Kg/cm ³ and an apparent specific gravity of 1.36 at the side wall portion, and a bending strength of 260 Kg/cm ³ and an apparent specific gravity of 1.70 at the bottom.

[Brief explanation of the drawing]

The drawings are for explaining the steps of the method for manufacturing a hydraulic inorganic molded product of the present invention, and FIG. 1 is a longitudinal cross-sectional view showing a state in which the mold is closed and the molding material is press-fitted into the mold cavity, and FIG. FIG. 3 is a vertical cross-sectional view showing the pressed state by the mold, and FIG. 3 is a vertical cross-sectional view showing the mold opening state. Explanation of symbols, 1...template, 2...opening, 3...
...male mold, 4...drain hole, 5...female mold, 6...mold cavity, 7...guiding hole, 8...storage tank, 9...pump,
10... Molding material, 11... Suction box, 12... Suction pump, 13... Exhaust pipe, 14... Shaped product, 1
5... Material.

Claims (1)

[Scope of Claims] 1. Consists of a male mold that is fitted into the opening of the template and can move forward and backward, and a female mold that has a number of drainage holes on the mold surface, and the edge of the template the male mold and the female mold are brought into contact with the opening edge of the female mold, and a hydraulic inorganic molding material is injected between the male mold and the female mold,
The molding material is dehydrated by suction from the exterior of the female mold, and then the molding material is pressed and shaped by advancing the male mold, and the molded material is hardened inside or outside the mold. A method for producing a characteristic hydraulic inorganic molded product. 2. The method for producing a hydraulic inorganic molded article according to claim 1, characterized in that a female mold having a material laid on the mold surface is used. 3 The hydraulic inorganic molding material is cement, gypsum,
The method for producing a hydraulic inorganic molded article according to claim 1 or 2, which comprises a calcium silicate forming material as a component. 4. The method for producing a hydraulic inorganic molded product according to any one of claims 1 to 3, wherein the molded product is in the shape of a container.