JPH0829535B2 - Mold and method for hydraulic molding - Google Patents

Description

TECHNICAL FIELD The present invention relates to a molding die and a molding method for a hydraulic molded product containing cement, gypsum, calcium silicate forming material and the like as components.

[Prior Art] Conventionally, a molding method for a hydraulic molded product as described in JP-B-61-51521 has been proposed. This molding method uses an upper die and a lower die having a large number of water drainage holes, arranges a material in a closed die, press-fits a hydraulic molding material between the upper die and the material, and Is stretched along the inner surface of the lower mold, and suctioned from the outside of the lower mold to cause dehydration of the molding material and shaping.

According to the above-mentioned molding method, the molding material is sucked from the outside of the lower mold during press-fitting into the mold cavity, so that the mold cavity having a complicated shape can be relatively reliably filled.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional molding method, since the lower mold having the water drainage holes is used, the mold is secured over the entire mold from the viewpoint of ensuring the mold strength. It is difficult to disperse an extremely large number of drainage holes sufficient to obtain good water permeability and air permeability on the entire surface of the lower mold.

Therefore, it is difficult to uniformly dehydrate the entire molding material in the mold cavity, or to uniformly suck the entire molding material to completely fill the molding material in every corner of the mold cavity.
It is difficult to obtain a molded product having good strength.

It is also conceivable to provide a rubber press member for pressing the molding material on the inner surface of the upper mold in order to accelerate the dehydration and filling of the molding material in the mold cavity. However, when the number of water drain holes provided in the lower mold is limited as in the conventional molding method described above, the desired effect that the pressing force of the rubber press member uniformly exerts on the entire molding material is obtained. Can't get

An object of the present invention is to reliably perform dehydration of a molding material and filling into a mold cavity to obtain a hydraulic molding having a good shape and strength.

[Means for Solving Problems] A mold for a hydraulically molded product according to the present invention comprises an upper mold and a lower mold that form a mold cavity, and the upper mold and the lower mold are ceramic powder fired porous bodies. The inner surface of the lower die is provided with a cloth, the outer surface of the lower die is provided with a vacuum suction device for dehydrating the water in the molding material, and the inner surface of the upper die is a rubber press member for pressing the molding material. Is provided, and a pressurizing chamber for exerting a pressing force on the rubber press member is provided on the outer surface side of the upper mold.

A molding method for a hydraulically molded product according to the present invention uses, as the upper mold and the lower mold, a ceramic powder fired porous body, and a hydraulic molding material is formed in a mold cavity formed by the upper mold and the lower mold. It is supplied and is provided on the inner surface of the upper mold while exerting a vacuum suction force on the molding material from the outer surface side of the lower mold through a cloth provided on the inner surface of the lower mold and exerting a pressing force from the outer surface side of the upper mold. A rubber press member presses the molding material to cause dehydration of the molding material to mold the molded material, and the molded material is cured inside or outside the mold.

[Operation] In the present invention, the upper die and the lower die are made of the ceramic powder fired porous body. Therefore, in a state where the die strength of the lower die is secured, an extremely large number of fine holes sufficient to secure good water permeability and air permeability throughout the die are dispersed over the entire surface of the lower die. As a result, the entire molding material in the mold cavity can be dehydrated uniformly, or the whole molding material can be uniformly sucked from the outer surface side of the lower mold to completely fill the molding material in every corner of the mold cavity. You can

Further, when the molding material is pressed by the rubber press member while exerting a pressing force from the outer surface side of the upper mold, an extremely large number of fine pores are dispersed at high density on the inner surface of the lower mold against which the molding material is pressed. The pressing force of the rubber press member is evenly applied to the entire molding material, and dehydration and filling of the molding material in the mold cavity can be promoted more reliably.

Since the cloth is provided on the inner surface of the lower mold, the molding material can be replaced after a certain period of use without the molding material penetrating into the fine holes of the lower mold to solidify and block the fine holes. The molding operation can be repeated stably.

That is, according to the present invention, dehydration of the molding material and filling into the mold cavity can be reliably performed, and a hydraulic molded article having a good shape and strength can be obtained.

[Embodiment] FIG. 1 is a sectional view showing a molding state by a molding die according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a backwashing state of the above molding die.

The molding die 10 includes an upper die 11 and a lower die 12, the upper die 11 is held by an upper housing 13, and the lower die 12 is held by a lower housing 14. One of the housings 13 and 14 is supported by a press mount (not shown), the other is connected to a press ram (not shown), etc. to open and close the upper mold 11 and the lower mold 12 to each other. A mold cavity that conforms to the shape of the object under the closed condition
15 is formed.

The upper mold 11 and the lower mold 12 are made of, for example, a ceramic powder fired porous body as shown in JP-A-61-2507, and have an extremely large number of fine pores communicating from the inner surface to the outer surface thereof.
They are evenly distributed over their entire surface. The ceramic powder includes mullite, alumina, chromite, silica, zircon, magnesia, talc, and the like. This ceramic powder fired porous body is mixed with a metal-based powder to improve the thermal conductivity, or mixed with a metal-based fiber, a ceramic-based fiber, a carbon fiber or the like to be reinforced, crack resistance,
The deformation resistance may be improved.

The upper mold 11 is provided with a supply pipe 16 for injecting into the mold cavity 15 a hydraulic molding material that is hardened by a hydration reaction such as cement, gypsum, and a calcium silicate forming material. 16A
Is an on-off valve. The molding material is pumped by a pump from a storage tank (not shown) and supplied in an amount sufficient to fill the mold cavity 15.

A cloth 17 is laid on the inner surface of the lower mold 12. Cloth 17
Is made of cloth, porous rubber or the like, and prevents the molding material from passing therethrough to prevent the molding material from entering the fine holes of the lower mold 12.

On the outer surface side of the lower mold 12, a vacuum suction device for dehydrating water in the molding material is provided. The vacuum suction device includes a suction chamber 18 formed between the lower housing 14 and the outer surface of the lower mold 12, and an exhaust pipe 19 communicating with the suction chamber 18, and the exhaust pipe 19 is connected to a vacuum suction pump (not shown). To be done. 19A is an on-off valve. By reducing the pressure of the suction chamber 18, water and air existing in the molding material and inside the mold cavity 15 are sucked into the suction chamber 18 through the fine holes of the cloth 17 and the lower mold 12. Suction chamber 18
The water sucked in is discharged from a drain hole (not shown).

A rubber press member 20 for pressing the molding material is provided on the inner surface of the upper mold 11. The rubber press member 20 has its outer peripheral edge portion joined to the inner surface of the upper mold 11. A pressure chamber 21 is formed between the upper mold 11 and the upper housing 13, and a pressure pump (not shown) is connected to the pressure chamber 21 via a pressure pipe 22. As a result, when the pressurizing chamber 21 is in a pressurized state, the high pressure air inside the pressurizing chamber 21 expands the rubber press member 20 like a bellows through the fine holes of the upper mold 11, and inside the mold cavity 15. Press the molding material. The rubber press member 20 is the supply pipe.
It also expands in the direction of closing the opening for 16 mold cavities 15.

The lower mold 12 has a lower mold body portion 12A having a discharge hole 23 at the time of backwashing.
And a conical plug 12B that closes the discharge hole 23 during molding and forms a part of the inner surface of the lower mold 12. That is, the plug 12B is attachable to and detachable from the discharge hole 23. In addition, the suction chamber 18 is provided with a backwash nozzle 24 for ejecting backwash water to the outer surface of the lower mold 12, and faces the lower side of the discharge hole 23 to discharge the backwash discharge. A discharge pipe 25 is provided for collecting and discharging it to the outside.

Next, a method for molding a hydraulic molded product using the molding die 10 will be described.

First, in the mold cavity 15 formed by the upper mold 11 and the lower mold 12, the supply pipe 16
The hydraulic molding material supplied from

Next, the suction chamber 18 is depressurized, and a vacuum suction force is applied to the molding material from the outer surface side of the lower mold 12 through the cloth 17 provided on the inner surface of the lower mold 12. Further, the pressurizing chamber 22 is put into a pressurizing state, and the molding material is pressed by the rubber press member 20 provided on the inner surface of the upper mold 11. As a result, the molding material is dehydrated and becomes a shaped article containing water in an amount necessary for the hydraulic reaction and filled in the entire area of the mold cavity 15.

In the molding die 10, for example, the shaped article may be cured at room temperature while the upper die 11 is opened and placed in the lower die 12 or in a curing chamber, or it may be taken out of the die 10 at room temperature. It may be cured below or in a curing chamber.

After repeating the above molding operation for a certain period, cloth
17 is replaced. Further, as shown in FIG. 2, backwash water is jetted from the backwash nozzle 24 to backwash the lower mold 12, and the residue inside the mold cavity 15 is discharged from the discharge hole 23 and the discharge pipe 25 to the outside. Discharge.

 The operation of the above embodiment will be described below.

In the above embodiment, the lower mold 12 is made of a ceramic powder fired porous body. Therefore, in a state where the die strength of the lower die 12 is secured, a very large number of fine holes sufficient to secure good water permeability and air permeability throughout the die are dispersed over the entire surface of the lower die 12. Thereby, the entire molding material inside the mold cavity 15 is uniformly dehydrated, or the whole molding material is sucked uniformly from the outer surface side of the lower mold 12 to form the forming material in every corner of the mold cavity 15. Can be completely filled.

Further, when the molding material is pressed by the rubber pressing member 20, a very large number of fine holes are densely dispersed on the inner surface of the lower mold 12 against which the molding material is pressed. Thus, the dehydration and filling of the molding material inside the mold cavity 15 can be promoted more surely evenly throughout the molding material. Further, the uniform dehydration and the uniform pressing force facilitate the molding of deep-drawn molded products.

Since the cloth 17 is provided on the inner surface of the lower mold 12, the molding material does not enter the fine holes of the lower mold 12 to solidify and block the fine holes, and the cloth 17 is used for a certain period of time. By replacing it later, the molding work can be stably repeated.

In the above embodiment, the lower mold 12 is replaced by the lower mold body 12
Since it is composed of A and the plug 12B and the discharge hole 23 at the time of backwash is provided, the residue at the time of backwash can be quickly discharged.

Therefore, dehydration of the molding material and filling of the inside of the mold cavity 15 can be reliably performed, and a hydraulic molded article having a good shape and strength can be obtained.

[Effects of the Invention] As described above, according to the present invention, it is possible to reliably perform dehydration of the molding material and filling into the mold cavity, and to obtain a hydraulic molding having a good shape and strength.

[Brief description of drawings]

FIG. 1 is a sectional view showing a molding state by a molding die according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a backwashing state of the molding die. 10 …… Mold, 11 …… Upper mold, 12 …… Lower mold, 15 …… Mold cavity,
16 …… Supply pipe, 17 …… Cloth, 18 …… Suction chamber, 19 …… Exhaust pipe, 20 …… Rubber press member, 21 …… Pressurization chamber, 22 …… Pressure pipe, 23 …… Discharge hole, 12A ...... Lower mold body, 12B …… Plug, 24 …… Backwash nozzle, 25 …… Discharge pipe.

Claims (3)

[Claims] 1. An upper mold and a lower mold for forming a mold cavity, wherein the upper mold and the lower mold are made of a ceramic powder fired porous body, a filter cloth is provided on an inner surface of the lower mold, and an outer surface of the lower mold is provided. Is provided with a vacuum suction device for dehydrating water in the molding material, and a rubber press member for pressing the molding material is provided on the inner surface of the upper mold.
A molding die for a hydraulic molded product, in which a pressurizing chamber that exerts a pressing force on a rubber press member is provided on the outer surface side of the upper mold. 2. The lower die comprises a lower die body having a discharge hole for backwashing, and a plug for closing a part of the inner surface of the lower die when the discharge hole is closed during molding. Mold for the hydraulic molded product according to claim 1. 3. An upper mold and a lower mold made of a ceramic powder fired porous body are used, and a hydraulic molding material is supplied into a mold cavity formed by the upper mold and the lower mold, and is provided on the inner surface of the lower mold. A vacuum suction force is applied to the molding material from the outer surface side of the lower mold through the filter cloth, and the molding material is pressed by a rubber press member provided on the inner surface of the upper mold while exerting a pressing force from the outer surface side of the upper mold. Then, a molding method for a hydraulic molded product, in which dehydration is caused to the above molding material to shape the molded product, and the molded product is cured inside or outside the mold.