JPH10138225A - Method for molding hydraulic inorganic molding and molding machine used for the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a molding without influence of the atmospheric temperature by maintaining release agent at suitable temperature for ensuring sufficient wettability of the agent to a mold surface. SOLUTION: The molding machine 1 comprises a mold having an upper mold 2 and a lower mold 3, and a heating means 6. The means 6 circulates warm water 61 of a warm water tank 60 via pipelines 64 to 66 to heat the molds 2, 3. A temperature controller 67 controls a heater 68 according to a temperature measured by a thermometer 9 provided in the mold 3 to heat the water 61 in the tank 60 to a suitable temperature. And, the controller 67 sets to the temperature for ensuring a sufficient wettability of the agent coating the surfaces of the molds 2, 3. Therefore, overall mold surfaces can be uniformly coated with the agent. Hence, even it is low atmospheric temperature such as in winter, molding fault due to mold release failure does not occur.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a hydraulic inorganic molded article and a molding apparatus used for the method.

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Patent Publication No. 54-20209 and Japanese Patent Publication No. 2-38362, a hydraulic inorganic molded product is formed in a vertical direction while surrounding a middle die and side peripheral surfaces of the middle die. After supplying a fixed amount of hydraulic inorganic raw material to the upper part of the middle die of the lower die composed of a slidable outer frame, while closing the upper and lower molds and compressing and molding this hydraulic inorganic raw material, or after compression molding After the molded article is dehydrated from the upper mold to obtain a molded article, the molded article is removed from the mold and cured and cured.

[0003] Further, when the molded product is removed from the mold, a mold release agent is previously applied to the mold surface in order to improve the mold releasability.

[0004]

However, in the above-mentioned conventional method for molding a hydraulic inorganic molded article, the function of the release agent applied to the mold surface becomes worse as the temperature of the release agent becomes lower. There was a problem that it would. That is, when the temperature is low such as in winter, the viscosity of the release agent increases, and the release agent is not evenly distributed on the mold surface, and a portion where the release agent film is not formed (hereinafter, referred to as a “film-unformed portion”). .)
Occurs on the mold surface.

[0005] If there is a portion where the film is not formed on the mold surface, when the molded object is taken out of the mold, the part where the film is not formed is not easily separated from the mold. Stripped and left, the obtained hydraulic inorganic molded article is
The surface becomes dug off, and the appearance deteriorates.

In addition, if a phenomenon occurs in which a part of the hydraulic inorganic molded product remains in the unformed portion of the mold surface without being released even once, as described above, even if the mold surface is cleaned. However, even if the adhered substance of the hydraulic inorganic molded article remaining on the mold surface is removed, the adhered substance of the hydraulic inorganic molded article adheres immediately to the same portion, that is, the portion where the film is not formed, causing the same phenomenon. Failure will occur.

Accordingly, the present invention has been made in view of the above problems, and when forming a hydraulic inorganic molded article, it is possible to always form a favorable hydraulic inorganic molded article without being affected by air temperature. An object of the present invention is to provide a molding method of an inorganic molded article and a molding apparatus used for the molding method.

[0008]

Means for Solving the Problems To achieve the above object, a method for forming a hydraulic inorganic molded product according to the present invention comprises:
In a molding method of a hydraulic inorganic molded product, in which a hydraulic inorganic material is press-molded between an upper mold and a lower mold having a mold agent coated on a mold surface, the mold releasing agent is used during molding. The temperature was maintained at an appropriate temperature to ensure sufficient wettability to the surface.

In the above molding method, as a method for maintaining the release agent at an appropriate temperature, a method in which the release agent is heated in advance and applied to the mold surface by spraying or the like, or a method in which the mold surface is heated and heated. There is a method of heating the release agent by heat from the mold, and a method of heating the mold surface and heating the release agent by the heat from the mold surface is preferable.

Further, the molding apparatus for a hydraulic inorganic molded article according to the present invention is a molding apparatus having a molding die comprising an upper die and a lower die, wherein the release agent applied to the die surface is sufficiently applied to the die surface. A configuration is provided in which a heating means capable of heating the mold surface to a temperature that can ensure excellent wettability is provided. In the above molding apparatus, the heating means is not particularly limited,
For example, a type in which a heating wire directly embedded in the mold is heated to heat the mold surface, a pipe is provided inside the mold along the mold face, and the pipe is heated externally. One in which warm water or steam is circulated to heat the mold surface may be used.

The heating wire directly embedded in the mold preferably has water resistance. For example, a method of securing water resistance by sealing with a waterproof sealing agent such as silicone is used. When attaching the lower mold to the base board that will be the base,
It is preferable to interpose a heat insulating material such as glass fiber between the lower mold and the base board.

Preferably, the heating means is provided with a thermometer in a hot water tank provided inside or outside the mold so that the temperature can be controlled based on the data of the thermometer. In addition, as described above, "heating to a temperature at which sufficient wettability of the release agent to the mold surface can be ensured" means that the release agent spreads all over the mold surface and a uniform film of the release agent is formed. It means that the temperature is raised to a temperature at which the viscosity of the release agent becomes such.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method for molding a hydraulic inorganic molded article according to the present invention and a molding apparatus used for the molding method will be described in detail with reference to the drawings showing an embodiment. FIG. 1 is a sectional view of a molding apparatus 1 as an example of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line XX of FIG.

As shown in FIG. 1 and FIG.
Is a molding die comprising an upper die 2 and a lower die 3 and a heating means 6.
And

The upper mold 2 comprises an upper mold body 25 and a filtration unit 2.
And 2. The upper die body 25 has a lower surface 2
A large number of water suction ports 202 and air introduction ports 214 are opened in 51. The squeezing suction port 202 is connected to a vacuum dehydration pump (not shown) provided outside via a suction pipe 201 provided inside the upper die body 25.

The air inlet 214 is connected to an air supply device (not shown) such as an air pump provided outside through an air supply pipe 211 provided inside the upper die body 25. The filtration unit 22 is composed of a drainer iron plate 221, a wire mesh 222, and a dewatering cloth 223.
24, it is detachable from the upper die body 25, and when attached to the upper die body 25, the water extraction suction port 202
A hole 220 corresponding to the air inlet 214 is formed in the drainer iron plate 221.

The lower mold 3 is provided so as to surround the middle mold 4 and the side wall surface of the middle mold 4, and is slidable up and down along the side wall surface of the middle mold 4 via a hydraulic cylinder (not shown). Outer frame 5. The middle mold 4 and the outer frame 5 are formed of liners 41 and 51, each of which has a sliding contact portion, which is replaceable and has excellent wear resistance.

The heating means 6 is provided outside the pipes 64, 65, 66 provided inside the upper mold 2 and the lower mold 3 (ie, the middle mold 4 and the outer frame 5). The hot water 61 in the heated hot water tank 60 is circulated to heat the upper and lower dies 2 and 3. That is, the hot water tank 60
The temperature controller 67 controls the heater 68 provided in the hot water tank 60 based on the temperature of the lower mold 3 measured by the thermometer 9 provided inside the lower mold 3 so that the hot water 61 in the hot water tank 60 can be appropriately adjusted. It can be heated to any temperature.

The heated hot water 61 is supplied to the pump 6
After being sent to the upper mold 2, the middle mold 4 and the outer frame 5 through the pipes 2 and the supply pipe 63, the upper mold 2, the middle mold 4 and the outer frame 5 are heated through the pipes 64, 65 and 66, respectively. It returns to the hot water tank 60 via the drain pipe 69. In the figure, 6
a is a rubber pipe that enables the supply pipe 63 and the drain pipe 69 to follow the movement of the upper mold 2 and the outer frame 5.

Next, a molding method using the molding apparatus 1 will be described in detail with reference to FIG. In this molding method, first, the upper and lower dies 2 and 3 are heated to the appropriate temperature at which the release agent 10 applied to the mold surface can secure sufficient wettability of the release agent 10 to the mold surface. Warm to temperature. Then, as shown in FIG.
After applying a mold release agent 10 to the lower mold 3, a fixed amount of the hydraulic inorganic raw material 7 is supplied to the lower mold 3.

Next, as shown in FIG. 3 (b), the upper and lower molds 2 and 3 are closed, and the hydraulic inorganic material 7 is compressed by the upper mold 2 and the upper mold 2 and the lower mold 3 are interposed. The shape of the formed cavity 32 is shaped, and while the air is supplied from the air introduction port 214 into the cavity 32, the water suction suction port 202 is formed.
The excess water in the hydraulic inorganic raw material 7 is dewatered by suction.

After sufficient suction dehydration, the air inlet 21
4 to stop the supply of air, as shown in FIG.
The outer frame 5 is lowered to open the side surface of the shaped object 8 and the upper mold 2 is raised as shown in FIG.
The shaping object 8 is lifted together with the upper mold 2 by suction from the squeezing suction port 202 and released from the middle mold 4. And
The upper mold 2 is moved onto a receiving mold (not shown), and the suction is stopped on the receiving mold.
The molded article 8 is supplied between the mold and the mold surface 29 of the upper mold 2, transferred to a receiving mold, cured and cured to obtain a molded article.

In this molding method, as described above, the mold itself is heated by the heating means 6 so that the mold release agent 10 can always ensure sufficient wettability to the mold surface of the mold release agent 10 during molding. Since the temperature can be maintained, the release agent 10 can be uniformly applied over the entire mold surface. Therefore, even in a low temperature period such as winter, molding failure due to mold release failure does not occur, and a hydraulic inorganic molded product can be molded with good yield.

Further, since the entire mold is heated and the hydraulic inorganic raw material in the cavity is also heated, the viscosity of water contained in the hydraulic inorganic raw material is reduced, and the dewatering efficiency is improved. It is possible to obtain a hydraulic inorganic molded article that is dense and excellent in strength. Further, since the heating means 6 circulates the hot water in the mold, there is no trouble such as disconnection inside as in the case where the heating wire is embedded in the mold, and maintenance is easy.

The present invention is not limited to the above embodiment. For example, the lower mold 3 is composed of a middle mold 4 and an outer frame 5.
However, if the cavity forming portion is shallow, the outer frame 5 does not move up and down and may be integrated with the middle mold 4.

[0026]

As described above, when the method for molding a hydraulic inorganic molded article according to the first aspect of the present invention is used, when molding a hydraulic inorganic molded article, it is always possible to avoid the influence of the outside air temperature. Good hydraulic inorganic moldings can be formed. In particular, according to the second aspect, the hydraulic inorganic material in the cavity can be heated to lower the viscosity of the water in the hydraulic inorganic material, thereby increasing the dewatering efficiency, and increasing the density and strength. It is possible to obtain a hydraulically inorganic molded article excellent in terms of quality.

Further, by using the molding apparatus of the third aspect, the above molding method can be easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of an embodiment of a molding apparatus used for a method for molding a hydraulic inorganic molded product according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is an explanatory view showing an example of an embodiment of a method for forming a hydraulic inorganic molded product according to the present invention in the order of steps.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding apparatus 2 Upper mold 29 Upper mold surface 3 Lower mold 39 Lower mold surface 6 Heating means 7 Hydraulic inorganic raw material 8 Implant 10 Mold release agent

Claims (3)

[Claims] (1) A method for molding a hydraulic inorganic material, which comprises press-molding a hydraulic inorganic material between an upper mold and a lower mold having a mold surface coated with a release agent. A method for molding a hydraulic inorganic molded article, characterized in that the release agent is maintained at an appropriate temperature at which sufficient wettability to a mold surface can be secured. 2. The hydraulic inorganic molded product according to claim 1, wherein the mold surface is heated, and the release agent is heated to a temperature at which sufficient release property of the release agent to the mold surface can be ensured by the temperature of the mold surface. Molding method. 3. A molding apparatus having a molding die comprising an upper mold and a lower mold, wherein the mold surface can be heated to a temperature at which the release agent applied to the mold surface can ensure sufficient wettability to the mold surface. The molding apparatus used in the method for molding a hydraulic inorganic molded article according to claim 1, further comprising a heating means.