JP2001328112A - Method for manufacturing inorganic board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To mold a hollow product or a solid product wherein generation of a sink following press forming is restrained, uniform mold release is realized, and appearance and quality are excellent. SOLUTION: In a vibration pressing process in manufacturing an inorganic board, vacuum suction (B) is stopped at a pressurization lower limit H of a press top force (2), and the press top force (2) is raised within a pressure range of <=0.5 kgf/cm by injection of air (C) to release the mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an inorganic plate. More specifically, the invention of this application suppresses inconveniences such as appearance failure at the time of press molding, and enables deep engraving and sharp pattern formation.
The present invention relates to a method for producing an inorganic plate useful as an exterior material or an interior material for a building.

[0002]

2. Description of the Related Art As an exterior material and an interior material for a building, an inorganic plate made of cement or the like is known. These inorganic plates are manufactured by, for example, pressing a wet green plate produced by an extrusion method or a casting method, pressing and forming a surface pattern, and then curing and curing.

[0003] In the press forming step in the production of such an inorganic plate, there is a method of press-forming while applying vibration, and vacuum-pressing between a press die and a green plate to be formed. It has also been practiced as having an effect of densifying the structure of the inorganic plate to improve the strength and improving the pattern formation.

In this vibration press forming method, for example, as illustrated in FIG. 5 as an example of the hollow product forming, a blank upper plate (2) is pressed against a hollow raw plate (1) as shown by an arrow A in the figure. And pressurize while applying vibration. Then, a vacuum is sucked between the raw plate (1) and the upper press die (2) as shown by an arrow B in the figure, and the upper press die (2) is pressed down to a predetermined lower pressure limit (H). Let me.

After the pressurization is completed, the vacuum suction is stopped to release the vacuum state, air is blown into the press mold (C), and the upper press mold (2) is raised to release the mold. .

Conventionally, a hollow or solid exterior wall material having a width of about 1 mm, a length of about 3 m, and a thickness of about 10 to 35 mm has been manufactured by such a method.

[0007]

However, in the above-described vibration press molding involving vacuum suction and air blowing, a predetermined linearity of the surface of the molded product is lost, and a defective appearance may occur. .

For example, in the molding of the hollow article (3) shown in FIG. 5, as shown in FIG. 6, a sink (3A) as a minute dent generated on the surface occurs, or a minute dent on the surface occurs. Distortion may occur.

Also, in the case of a solid product, a minute distortion or the like may occur on the surface of the molded product, and the predetermined linearity of the pattern surface may be lost. The occurrence of such sink marks (3A), distortion, and the like are promptly resolved because they cause the appearance of the inorganic plate to deteriorate as a result of the loss of the predetermined linearity of the pattern surface, and also affect the quality such as strength. It was a task that had to be done.

[0010]

Means for Solving the Problems The invention of this application solves the above-mentioned problems. First, in the step of vibrating press forming of a hollow article in the production of an inorganic plate, the pressing of a press upper die is performed. A method for producing an inorganic plate, characterized in that vacuum suction at a lower limit is stopped and an upper press die is lifted and released in a pressure range of 0.5 kgf / cm ² or less by blowing air.

Second, in the above method, -20c
Provided is a method for producing an inorganic plate, wherein a press upper die is lifted and released in a pressure range of mHg or more. Thirdly, in the invention of this application, in the step of vibration press molding of a solid product in the production of an inorganic plate, vacuum suction at the lower limit of pressurization of the upper press die is stopped and air is blown. A method for producing an inorganic plate is provided, in which the upper press is raised in a pressure range of 0 kgf / cm ² or less to release the mold, and fourthly, 0.2 kgf / cm ² or more and 0.7 kgf / cm ² or more. ^The method for producing an inorganic plate described above is characterized in that the press upper die is lifted and released in a pressure range of ² or less.

In other words, the invention of this application is effective in producing sink marks in the case of a hollow article which has been regarded as a problem in the past, and in the surface pattern due to distortion or the like which may occur in both a hollow article and a solid article. The lack of the predetermined linearity is based on the finding that the adjustment of air blowing at the time of mold release due to the rise of the press upper die is not appropriate. In the invention of this application, based on such knowledge, by setting the pressure of the air blowing as described above, in a hollow product, the occurrence of sink marks on the surface is suppressed, and uniform release is ensured, and the appearance is poor. In addition, it is possible to suppress the occurrence of the inconvenience described above and to secure uniform release even in a solid product, thereby realizing good appearance and quality.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of this application has the features as described above, and embodiments thereof will be described below.

First, in the vibration press forming in the first invention of this application, as shown in FIG.
The upper press die (2) is lowered against the hollow raw plate (1) as shown by arrow A in the figure, and pressurized while applying vibration. Then, a vacuum is sucked between the raw plate (1) and the upper press die (2) as shown by an arrow B in the drawing, and the upper press die (2) is pressurized and lowered to a predetermined lower pressure limit (H). . After the pressurization is completed, the vacuum state is released, air is blown from inside the press mold (C), and the upper press mold (2) is raised to release the mold.

However, conventionally, in the vibration press molding with vacuum suction, sink marks (3A) may be generated on the surface of the hollow article (3) after molding as shown in FIG.
In addition, even when the pattern is not remarkable like sink mark (3A), a predetermined linearity may be lost due to distortion or undulation of the pattern surface.

Therefore, in the first invention of this application, FIG.
In the step of vibration press molding of a hollow product in the production of an inorganic plate, the vacuum suction at the lower pressurization limit (H) of the upper press is stopped, and the pressure in the mold is increased by air blowing (C). The upper press die (2) is lifted and released in a pressure range of 5 kgf / cm ² or less.

Conventionally, the pressure state is not adjusted by the air blowing (C). Therefore, when the blowing air is large, the above-mentioned sink mark (3) is formed.
A) had occurred.

On the other hand, in the first invention of this application, since the press upper die (2) is raised under an air blowing pressure of 0.5 kgf / cm ² or less, the occurrence of sink marks as in the prior art is prevented. Can be suppressed.

Even if air blowing (C) is performed, if the vacuum state is still high, the hollow after molding follows the upper press die (2) when the upper press die (2) rises. The product (3) is lifted, and good release cannot be performed, and the predetermined linearity of the pattern surface is easily lost. For this reason, it is preferable to raise the press upper mold (2) in a pressure range of −20 cmHg to 0.5 kgf / cm ² as in the second invention of the present application. More preferably, the pressure is in the range of -10 cmHg to 0.

The pressure range as described above is a pressure range in which the hollow article (3) after molding does not sink due to the degree of vacuum at which the hollow article (3) separates from the upper press mold (2) by its own weight. According to the first and second inventions of this application, a hollow hole (1) actually produced by extrusion molding of a cement-based kneaded material is actually used.
A high-quality hollow product (3) as shown in FIG. 2, which has no surface sink marks and is kept linear by uniform release in the vibration press forming of the green plate (1) having A).
Has been obtained.

On the other hand, in the third application of the present application for solid products
In the case of the invention of (3), as illustrated in FIG. 3, the vacuum suction (B) at the lower pressure limit (H) of the press upper die (2) is stopped,
1.0kgf / c in mold pressure by air blowing (C)
The upper press die (2) is raised within a pressure range of m ² or less.
More preferably, the elevation of the press upper die (2) is 0.2 kgf / cm ² or more and 0.1 kgf / cm ² or more as in the fourth invention of this application.
Start in a pressure range of 7 kgf / cm ² or less.

By doing so, the solid product (4) after molding does not follow up the rise of the press upper die (2) and is lifted up, and a minute distortion or undulation is generated on the pattern surface. The inconvenience that occurs in the conventional case does not occur. Uniform release is realized, and occurrence of appearance defects is suppressed.

In the invention as described above in this application, the hollow product or solid product for producing an inorganic plate has a composition of a general cement-based inorganic plate or a composition similar thereto, and is not used for building. The main object is a thickness after molding (thickness between the pattern front surface and the back surface) of about 10 to 35 mm, which is considered as an exterior material or interior material for use.

In the method for producing an inorganic plate of the present invention, the vibration press forming by vacuum suction (B) can be performed in the same manner as in the prior art. The air before vacuum suction is blocked in the space between the mold and the upper press mold (2), the pressure of which rises, and the upper part of the hollow hole (1A) of the raw plate (1) is pushed to form a hollow product (3). Since sinks may occur on the surface, it is effective to start vacuum suction at a position 2 to 5 mm above the lower pressure limit (H). By such timing adjustment, the occurrence of sinks during molding pressurization can be suppressed.

The degree of vacuum in the press mold at the time of vacuum suction is-
0.5 MPa or more, more preferably -0.7 MPa or more. In practice, the degree of vacuum is from -1.5 MPa to 0.
It is desirable that the pressure be 7 MPa. Vacuum degree -0.7MP
By setting it to a or more, it is possible to reliably prevent the occurrence of sink marks at the time of pressurization in molding a hollow article. Further, it is possible to prevent the upper portion of the hollow hole (1A) from having the same appearance defects as sink marks which are lowered by its own weight. Then, the upper press die (2) presses the green plate (1) with a press pressure necessary to lower the press plate to a predetermined press lower limit (H) position. Can be set to The same applies to vibration applied as a vibration press.

In the case of a solid product, the upper press die (2) is not vacuumed while the upper press die (2) is lowered (A) to its pressurization lower limit (H) position. It is preferable to start the vacuum suction (B) when the pressure reaches the lower limit (H).

If the vacuum suction is started before the press upper mold (2) reaches the lower pressure limit (H), the space between the green plate (1) and the press upper mold (2) is reduced in pressure, Press upper die (2)
The raw plate (1) may be taken on the textured surface of (1), and sink marks may occur on the back surface of the solid product (4). However, when the pressure reaches the lower limit (H) as described above, vacuum suction ( The problem is solved by starting B).

For example, by adjusting the vacuum suction (B) at the time of pressurizing the molding as described above, the method of controlling the pressure at the time of mold release according to the invention of the present application does not cause sink marks and forms a predetermined uniform shape. And a synergistic effect that a press-formed product having good appearance and good quality can be produced.

The hollow article (3) or the solid article (4) obtained by the method of the invention of this application is cured and cured in a subsequent curing step, and is appropriately subjected to surface decorative painting. An inorganic plate with poor appearance and reduced quality deterioration is manufactured.

In the curing step, a tray on which a hollow or solid molded article having excellent appearance and quality is placed may be directly subjected to the curing step and cured. Be considered. That is, as illustrated in FIG. 4, the tray (6) on which the molded article (5) formed in the press forming step (D) is placed is transferred to the curing step (E) in a state in which the tray is placed. Cure and harden. The tray (6) on which the molded article (5) is placed may be cured and cured alone in the curing step (E), or may be cured and cured in a loaded state as shown in FIG.

In any case, since the molded article (5) is not transferred from the tray (6) after press molding, the dimensional stability of the molded article (5) is improved. Thus, the excellent effects of the invention of the present invention can be utilized.

Of course, the invention of this application is not limited at all by the above description. It goes without saying that further embodiments are possible in detail.

[0033]

As described in detail above, according to the invention of this application, the occurrence of sink marks is suppressed, uniform release is possible, and a hollow or solid product having excellent appearance and quality can be formed. It is said. This makes it possible to produce a good inorganic plate.

[Brief description of the drawings]

FIG. 1 is a partial schematic cross-sectional view illustrating press molding of a hollow article of the present invention.

FIG. 2 is a partial sectional view illustrating a hollow article obtained by the method of FIG. 1;

FIG. 3 is a partial schematic cross-sectional view illustrating press molding of a solid product of the present application.

FIG. 4 is a schematic diagram showing transfer of a tray on which a formed plate is placed from a press forming step to a curing step.

FIG. 5 is a partial schematic sectional view showing a conventional hollow article press molding.

FIG. 6 is a partial cross-sectional view showing sink marks on a surface generated in a hollow article.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Raw plate 1A Hollow hole 2 Press upper die 3 Hollow product 3A Sink 4 Solid product 5 Molded product 6 Tray A Descent of press upper die B Vacuum suction C Air blowing D Press molding process E Curing process

Continued on the front page (72) Inventor Toyoman Shirazu 1048 Odakadoma, Kadoma-shi, Osaka Matsushita Electric Works F-term (reference) 4G055 AA02 AB03 AC01 AC08 BA44 BA52

Claims (4)

[Claims] In a step of vibrating press forming of a hollow article in the production of an inorganic plate, the vacuum suction at the lower limit of pressurization of a press upper die is stopped, and 0.5 kgf is blown by blowing air.
A method for producing an inorganic plate, wherein the upper press die is lifted and released in a pressure range of not more than / cm ² . 2. The method for producing an inorganic plate according to claim 1, wherein the upper press die is lifted and released in a pressure range of −20 cmHg or more. 3. In the step of vibration press molding of a solid product in the production of an inorganic plate, the vacuum suction at the lower limit of pressurization of the press upper die is stopped, and 1.0 kgf is blown by blowing air.
A method for producing an inorganic plate, wherein the upper press die is lifted and released in a pressure range of not more than / cm ² . 4. 0.2 kgf / cm ² or more and 0.7 kgf
The method for producing an inorganic plate according to claim 3, wherein the press upper die is lifted and released in a pressure range of not more than / cm ² .