JPH08132419A - Manufacture of ceramic building plate - Google Patents

Abstract

PURPOSE: To enhance dewatering effect at reduced pressure without impairing molding efficiency. CONSTITUTION: Molding material is poured in the cavities 21 of a plurality of bottom molds 18, in which filter pads 30 are laid in the cavities 21, so as to pre-dewater the molding material 25 on the filter pads 30 by reduced pressure dewatering. The bottom molds 18, in which pre-dewatering is brought to an end, are successively slid to a pressing position so as to successively dewater the molding material in the cavities 21 under reduced pressure at the pressing position and, at the same time, press the molding material by lowering a top mold 12. During the sliding of the bottom mold 18, in which pre-dewatering is brought to an end, to the pressing position, by lifting the rollers 37 of the bottom molds 18 on a guide rail 33 raised with cams 34, the bottom molds 18 are floated from a trestle 17 so as to easily slide the bottom mold 18. In the pressmolding, the guide rail 33 is lowered so as to restore the state that the bottom mold 18 is placed on a press base plate 57.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to the production of a ceramic building board in which a slurry-forming molding material is injected into a cavity of a lower mold, and the upper mold is lowered while dehydrating under reduced pressure to press-mold a ceramic building board. It is about the method.

[0002]

2. Description of the Related Art Conventionally, as a method for molding a concrete product, in order to perform the molding efficiently, for example, Japanese Patent Publication No. 6-
As disclosed in Japanese Patent No. 75860, there is known a dehydration molding method in which a molding material in a cavity is dehydrated under reduced pressure by a vacuum dehydration apparatus and an upper die is lowered to perform press molding.

[0003]

The present inventor has tried to apply this dehydration molding method to the molding of ceramic building boards, but the following problems have occurred. That is, the molding material used in the conventional dehydration molding method is a mixture of cement and coarse aggregate, which has good drainage inside the molding material and relatively low filtration resistance, but is attached to the outer wall of the house. The molding material used for molding ceramic-based building boards is made by mixing inorganic hydraulic fine particle materials such as cement with fibrous materials such as pulp and organic synthetic fibers, and water to form a slurry. Compared with a molding material containing coarse aggregate, the drainage inside the molding material is poor and the filtration resistance is large.
Therefore, even if the molding material is dehydrated under reduced pressure, the dehydration rate is slow, and a long dehydration time is required to perform sufficient dehydration, resulting in poor molding efficiency. Moreover, if the upper mold is lowered and press-molded in a state where the dehydration is insufficient, the molding material containing a large amount of water leaks from the periphery of the upper mold, resulting in a poor yield.

Further, in the dehydration molding method disclosed in Japanese Patent Publication No. 6-75860 mentioned above, a filter cloth is stretched on the upper surface of the vacuum dehydrator, and the molding material is dehydrated on the filter cloth for press molding. The filter cloth is clogged quickly, and the molding machine must be stopped during the molding operation to replace the filter cloth, and the operating rate of the molding machine also deteriorates, which also deteriorates the molding efficiency. Cause.

Further, since the molded product lifted up together with the upper mold after the press molding is pushed down onto the pallet by the press plate and transferred, the surface of the molded product is easily scratched and the yield is deteriorated.

In consideration of such circumstances, a first object of the present invention is to make it possible to carry out sufficient vacuum dehydration without impairing the molding efficiency, and further to the second aspect of the present invention.
The purpose of is to prevent damage to the molded product in the process of taking out and transferring the molded product.

[0007]

In order to achieve the above first object, the method for manufacturing a ceramic building board according to claim 1 of the present invention is the method of injecting a slurried molding material into a cavity of a lower mold. A method for press-molding a ceramic building board by lowering the upper mold while dehydrating under reduced pressure, wherein a plurality of lower molds are slidably provided, and at the bottom of each lower mold, a molding material in the cavity is formed. A vacuum dewatering device for vacuum dewatering is provided, and the molding material is injected with the filter pad laid in the cavity of each of the lower molds, and the molding material on the filter pad is pre-dehydrated by the vacuum dewatering device to perform pre-dehydration. The lower mold that has finished is sequentially slid to the press molding position, and at the press molding position, the upper mold is lowered while continuously decompressing the molding material in the cavity of the lower mold by the decompression dehydration device. It is intended to press molding.

Further, according to a second aspect of the present invention, when the plurality of lower molds are provided with rollers and the guide rails are provided so as to be capable of moving up and down corresponding to the rollers, the lower molds after the preliminary dehydration are slid to the press molding position. In addition, by raising the guide rail and placing the roller on the guide rail and lifting it, the lower die is floated from the pedestal, and in this state, the lower die is press-formed along the guide rail. It slides to the position, and at the time of press molding, the guide rail is lowered to return the lower die to the state of being placed on the press base plate and press molding.

Further, according to a third aspect of the present invention, a U-shaped grooved rubber member for both air suction and sealing is attached to the entire lower surface of the upper die with its groove opening facing inward, and the upper surface of the U-shaped grooved rubber member. An air intake port formed in the upper part of the cavity is communicated with an external air intake device through a through hole formed in the upper mold, and during press molding, the air intake device allows the air intake device to pass through the groove of the U-groove-shaped rubber member in the cavity. State in which the upper part of the U-shaped rubber member is press-molded while sucking air, and as the press-molding progresses, the lower surface of the U-shaped rubber member is crushed and the air intake port is closed by the lower surface of the U-shaped rubber member. It was made to become.

In order to achieve the second object, in claim 4, when the press-molded product is taken out from the cavity, the press-molded product is adsorbed to the upper mold together with the filter pad by an air suction force. Then, the filter pad separation step is carried out, and in this filter pad separation step, a curved suction pad made of a soft sponge is directed to the upper surface of the press-formed product and is sucked by an air suction force. The press-formed product is temporarily deformed along the curved shape of the suction pad to separate the press-formed product from the filter pad.

[0011]

According to the first aspect of the present invention, the molding material is injected into the cavities of the plurality of lower molds while the filter pad is laid, and the molding material on the filter pad is preliminarily dehydrated by the decompression dehydrator, The lower mold that has completed the preliminary dehydration is sequentially slid to the press molding position, and the molding material in the cavity of the lower mold is continuously dehydrated under reduced pressure by the vacuum dehydrator at the press molding position, and the upper mold is lowered to perform press molding. Therefore, even if there is a large filtration resistance of the molding material used to mold the ceramic building board, the molding efficiency can be improved by performing preliminary dewatering with another lower mold in parallel with press molding. The molding material can be sufficiently dehydrated under reduced pressure without impairing it.

Moreover, since the molding material is injected into the cavities of the lower molds while the filter pad is laid and the molding material is subjected to vacuum dehydration / press molding on the filter pad, the molding material is formed on the upper surface of the vacuum dehydrator. Since it is not necessary to stretch the filter cloth on which the filter is placed, the conventional troublesome work of changing the filter cloth is unnecessary. In the present invention, the filter pad that plays a role of the filter cloth may be laid in the cavity without impairing the molding efficiency.

According to the second aspect of the present invention, when the lower die for which the preliminary dehydration has been completed is slid to the press molding position, the guide rail is raised and the lower die roller is placed on the guide rail and lifted. To keep it floating from the stand. In this state, the lower die can be easily slid to the press forming position by rolling the lower die roller along the guide rail. At the time of press molding, the guide rail is lowered to return the lower mold to the state of being placed on the press base plate and press molding. As a result, the press pressure can be supported by the press base plate.

On the other hand, according to a third aspect of the present invention, a U-groove rubber member for both air suction and sealing is attached to the entire circumference of the lower surface of the upper mold with its groove opening facing inward, and the upper surface of the U-groove rubber member. An air intake port formed in the upper part of the cavity is communicated with an external air intake device through a through hole formed in the upper mold, and during press molding, the air intake device allows the air intake device to pass through the groove of the U-groove-shaped rubber member in the cavity. Press in while sucking in the air above. This causes excess water in the upper part of the cavity to be sucked out together with the air,
Decompression dehydration is also performed from the upper side in the cavity, and the dehydration rate is increased.

At this time, as the press molding progresses, the lower surface of the U-groove rubber member is crushed and the air inlet is closed by the lower surface of the U-groove rubber member, so that the air is automatically sucked. To be stopped. Thereby, it is possible to prevent the upper molding material in the cavity from being sucked out, and after the press molding is completed, the press molded article can be taken out together with the filter pad by the air suction force by the air suction force.

Further, in claim 4, when the press-formed product is taken out from the cavity, the press-formed product is adsorbed by the air suction force to the upper mold together with the filter pad by the air suction force, and is transferred to the filter pad separating step. . Since this transfer is performed with the filter pad still attached to the lower surface of the press-molded product, the lower surface of the press-molded product is protected by the filter pad and is not scratched. Then, in the filter pad separation step, a curved suction pad made of soft sponge is directed onto the upper surface of the press-molded product and is sucked by the air suction force, so that the press-molded product is temporarily moved along the curved shape of the suction pad. And press-molded product is separated from the filter pad. At this time, since the suction pad on the upper surface of the press-formed product is made of soft sponge, the press-formed product can be separated from the filter pad without damaging the upper surface of the press-formed product.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. First, the configuration of the entire molding apparatus will be described. A pair of press cylinders 13 for vertically moving the upper die 12 are attached to the press body base 11. Upper mold 1
2 is attached to a mold holder 15 fixed to a rod 14 of a press cylinder 13.

On the other hand, a pedestal 17 is installed on the foundation 16 so as to pass below the upper die 12, and, for example, two lower dies 18 are placed on the pedestal 17. Each lower mold 18
Form a cavity 21 by the left and right end plates 19 and the front and rear side plates 20 (see FIGS. 2 and 3). Lower mold 18
As shown in FIGS. 2 and 3, the side plate 20 of FIG. 2 is pressed down by the side plate pressing die 40, and the side plate pressing die 40 performs the clamping and opening operations by the pressing die cylinder 41. Has become.

As shown in FIG. 3, a suction box 22 (vacuum dehydrator) for sucking out air is provided at the bottom of each lower mold 18. A large number of water passage holes 24 are formed in the upper surface of the suction box 22, and the molding material 25 in the cavity 21 is dehydrated under reduced pressure through the water passage holes 24. An intake port 26 is formed on the upper side surface of the suction box 22, and the intake port 26 is connected to an external vacuum pump (not shown) via an air hose 27. A drain port 28 is formed at the lower end of the other side surface of the suction box 22, and the drain port 28 is connected to an external drain pump (not shown) via a drain hose 29.

A filter pad 30 for filtering the molding material 25 is laid on the upper surface of the suction box 22 (that is, the bottom surface of the cavity 21). The filter pad 30 is formed by winding a filter cloth or canvas filter material 32 around a mesh core material 31 made of metal or plastic (see FIG. 4).

Next, a structure for sliding the lower mold 18 along the frame 17 will be described. As shown in FIGS. 1 and 3, the gantry 17 is provided with two guide rails 33 that are vertically movable by a plurality of cams 34.
Each cam 34 is driven by a rail vertical movement cylinder 36. Corresponding to the guide rail 33, each lower mold 18
Rollers 37 are rotatably provided on the lower portions of both side surfaces of the lower mold 18, and when the guide rail 33 is lifted, the rollers 37 of the lower mold 18 are placed on the guide rail 33 and lifted to move the lower mold 18 to the mount 17 (or The lower die 18 is floated from the press base plate 57) so that the lower die 18 can freely slide along the guide rails 33. In this state, the lower die 18 is pushed (or pulled) by the lower die slide cylinder 38 to move to the preliminary dehydration position (I) or (III).
And slide between the press molding position (II).

On the other hand, the lower surface of the upper die 12 is shown in FIGS.
As shown in FIG. 5, an uneven pattern pattern for press molding is formed. A U-groove-shaped rubber member 43 for both air suction and sealing is attached to the entire lower surface of the upper die 12 with its groove opening facing inward. An air inlet 44 formed at the four corners of the upper surface of the U-shaped rubber member 43 and at the center of the long side has a through hole 45 formed in the upper die 12 and an air hose 46 (see FIG. 1).
It is connected to an external air suction device (not shown) via a pressurizing means, and press-molds while sucking air in the upper part of the cavity 21 through the groove of the U-groove rubber member 43 at the time of press-molding. There is.

After completion of the press molding, the press molded product 50 together with the filter pad 30 is adsorbed to the upper mold 12 by the air suction force, taken out from the cavity 21, and placed on the conveyor 51 as shown in FIG. Transfer to the pad separation process. In this filter pad separating step, the filter pad separating device 52 for separating the press-formed product 50 from the filter pad 30 has the following configuration.

That is, as shown in FIG. 8B, the suction box 53 provided so as to be vertically movable is provided with the air hose 5.
It is connected to a high-pressure blower (not shown) via the No. 4. On the other hand, a curved suction pad 55 made of soft sponge is attached to the lower surface of the suction box 53 by adhesion or the like, and suction pressure is applied to the lower surface of the suction pad 55 through a number of suction holes formed in the entire lower surface of the suction box 53. 8 (c) by the suction pressure.
As shown in FIG. 5, the press-formed product 50 is curved and deformed to be separated from the filter pad 30. After the separation, the air hose 54 is switched from the high pressure blower to the compressed air source by switching the valve (not shown), and the compressed air is sent to the adsorption pad 55 to release the adsorption.

A process of manufacturing a ceramic building board using the molding apparatus configured as described above will be described. An overview of all steps is shown in FIG. In Figure 1, (I) and (III)
The position is the preliminary dehydration position, and the position (II) is the press molding position. The lower mold 18, which has completed the preliminary dehydration at the preliminary dehydration position (I), is slid to the press molding position (II),
Along with this, the lower mold 18 of the press molding position (II) is extruded to the preliminary dewatering position (III). Each time the press molding is performed once, the slide direction is reversed from the previous time and the lower mold 18
Slide to perform press molding continuously.

At the preliminary dewatering position (I) or (III), a predetermined amount of molding material 25 is charged into the cavity 21 from a material supply device (not shown). At this time, the cavity 2 is previously
A filter pad 30 is laid on the bottom surface of the mold 1, and the molding material 25 drops onto the filter pad 30. The molding material 25 is an inorganic hydraulic fine particle material such as cement, pulp,
A fibrous material such as an organic synthetic fiber is mixed with water to form a slurry.

After the molding material 25 is charged into the cavity 21, the inside of the suction box 22 below the cavity 21 is sucked by a vacuum pump (not shown) to reduce the pressure inside the suction box 22 and the molding material 25.
Of the water is sucked into the suction box 22 from the water passage hole 24 through the filter pad 30. The sucked water is discharged from the drain port 28 to the outside of the suction box 22.

In this way, while preliminarily dewatering the molding material 25 in the cavity 21 at the preliminary dewatering position (I) or (III), the lower mold 18 is lowered at the press molding position (II). Perform press molding. Also in this press molding position (II), decompression dehydration is continued to increase the dehydration rate. Further, at the time of this press molding, the press molding is performed while sucking the air in the upper part of the cavity 21 through the groove of the U-groove shaped rubber member 43 on the lower surface of the lower mold 18. This allows the cavity 2
The excess water in the upper part of 1 is sucked out together with the air,
The dehydration under reduced pressure is also performed from the upper side in the cavity 21, and the dehydration rate is effectively increased.

At this time, the press molding proceeds and the cavity 2
As the suction of the air in the upper part of the U 1 progresses, the U-groove rubber member 43 due to the press pressure and the pressure drop in the cavity 21.
The lower surface of the U-shaped rubber member 43 is crushed so that the air intake port 44 is closed by the lower surface of the U-shaped rubber member 43, and the air intake is automatically stopped. This prevents the upper molding material 25 in the cavity 21 from being sucked out. After the press-molding is completed, the press-molded product 50 is adsorbed to the upper mold 12 together with the filter pad 30 by the air suction force, taken out, and placed on the conveyor 51 to be transferred to the filter pad separating step. Since this transfer is performed with the filter pad 30 attached to the lower surface of the press-formed product 50,
The lower surface of the press-formed product 50 is protected by the filter pad 30 and is not scratched.

On the other hand, when the press-formed product 50 is adsorbed by the upper mold 12 together with the filter pad 30 and taken out, the lower mold 1 for which the preliminary dehydration is completed at the preliminary dehydration position (I) or (III).
8 is slid to the press molding position (II) as follows. First, the cam 34 is driven by the rail up / down operation cylinder 36 to raise the guide rail 33. As a result, the roller 37 of the lower die 18 is placed on the guide rail 33 and lifted, the lower die 18 is floated from the pedestal 17, and the lower die 18 can be freely slid along the guide rail 33. In this state, the lower slide cylinder 38
By pushing (or pulling) the lower mold 18 to move the lower mold 18 of the preliminary dehydration position (I) or (III) to the press molding position (I
The lower mold 18 of the press molding position (II) is slid to the preliminary dewatering position (III) or (I).

When this slide is completed, the cam 34 is returned to the original position, the guide rail 33 is lowered, the lower mold 18 of the preliminary dehydration position (I) or (III) is placed on the mount 17, and press molding is performed. The lower mold 18 at the position (II) is placed on the press base plate 57 so that the press pressure is supported by the press base plate 57. After that, by performing the above-described preliminary dehydration and press molding in parallel, press molding is continuously performed while performing preliminary dehydration. Therefore, even if there is a large filtration resistance of the molding material 25 used for molding the ceramic building board, by performing preliminary dewatering with the other lower mold 18 during press molding, molding efficiency is not impaired. The material 25 can be sufficiently dehydrated under reduced pressure.

Moreover, since the molding material 25 is injected into the cavity 21 of each lower mold 18 with the filter pad 30 laid, and the molding material 25 is dehydrated under reduced pressure and press-molded on the filter pad 30, the conventional method is used. As described above, it is not necessary to stretch the filter cloth on which the molding material is placed on the upper surface of the vacuum dewatering device, and the conventional troublesome work of changing the filter cloth is not required. In this embodiment, the filter pad 30 serving as a filter cloth may be laid in the cavity 21 without impairing the molding efficiency.

On the other hand, in the filter pad separating step, as shown in FIG.
As shown in FIG. 5, a curved suction pad 55 made of a soft sponge is directed to the upper surface of the press-molded product 50, and the press-molded product 50 is suctioned by the air suction force of the high-pressure blower.
Is temporarily deformed along the curved shape of the suction pad 55 to separate the press-formed product 50 from the filter pad 30. At this time, since the suction pad 55, which is placed on the upper surface of the press-molded product 50, is formed of soft sponge, the press-molded product 50 is separated from the filter pad 30 without damaging the upper surface of the press-molded product 50. can do.

The press-formed product 50 separated from the filter pad 30 in this way is cured and cured as shown in FIG.
The product goes through a curing process, a drying / cutting process, and a painting process. On the other hand, the filter pad 30 is returned to the press molding process with or without passing through the cleaning device and laid in the lower mold 18 of the preliminary dehydration position (I) or (III).

In the above embodiment, the preliminary dehydration and the press molding are performed in parallel by using the two lower molds 18, but by using three or more lower molds 18, a plurality of lower molds are used. It is also possible to press-form by using another one of the lower molds 18 while performing the preliminary dehydration at 18. If the number of the lower molds 18 increases, the preliminary dehydration time can be extended.

[0036]

As is apparent from the above description, according to the method of manufacturing a ceramic building board of claim 1 of the present invention, the molding material is formed in a state in which the filter pads are laid in the cavities of the plurality of lower molds. After injection, the molding material on the filter pad was preliminarily dewatered, and the lower mold that had been preliminarily dewatered was sequentially slid to the press molding position for press molding, so the molding material used for molding the ceramic building board Even if the filtration resistance is large, by performing preliminary dewatering with another lower mold in parallel with press molding, the molding material can be sufficiently dewatered under reduced pressure without impairing the molding efficiency. As a result, it is possible to prevent the molding material containing a large amount of water from leaking out from the periphery of the upper mold, and it is possible to improve the yield. Moreover, since the depressurizing dehydration / press molding of the molding material is performed on the filter pad laid in the cavity of each lower mold, there is no need to put a filter cloth to put the molding material on the upper surface of the depressurizing dewatering device as in the conventional case. There is no need for the conventional troublesome filter cloth replacement work.

According to the second aspect, when the lower mold that has completed the preliminary dehydration is slid to the press molding position, the guide rail is raised and the lower mold roller is placed on the guide rail and lifted. Since it is made to float from the pedestal, the lower mold can be easily slid to the press molding position. Moreover, during press molding, the guide rail is lowered to return the lower die to the state of being placed on the press base plate for press molding, so that the press pressure can be supported by the press base plate and stable press molding is possible. is there.

On the other hand, in claim 3, on the entire lower surface of the upper die,
A U-groove rubber member for both air intake and sealing was attached with its groove opening facing inward, and at the time of press molding, press molding was performed while sucking air in the upper part of the cavity through the groove of the U-groove rubber member. Therefore, the excess water in the upper part of the cavity can be sucked out together with the air,
The dehydration under reduced pressure can be performed from the upper side in the cavity, and the dehydration rate can be further increased. Moreover, as the press molding progresses, the lower surface of the U-groove-shaped rubber member is crushed and the air suction port is closed by the lower surface of the U-groove-shaped rubber member, so that the molding material in the upper part of the cavity is sucked out. The press-molded product can be adsorbed to the upper mold together with the filter pad and taken out after the press-molding is completed.

According to the present invention, the work of taking out the press-formed product from the cavity and transferring it to the filter pad separating step is performed with the filter pad attached to the lower surface of the press-formed product. The lower surface can be protected by a filter pad and scratches of the press-molded product can be prevented. Then, in the filter pad separation step, a curved suction pad made of soft sponge is directed onto the upper surface of the press-molded product and is sucked by the air suction force, so that the press-molded product is temporarily moved along the curved shape of the suction pad. The press-molded product is separated from the filter pad by transforming it into a filter, and the work of separating the filter pad can be automated, and the press-molded product can be filtered without scratching the top surface of the press-molded product with the suction pad made of soft sponge. It can be separated from the pad.

[Brief description of drawings]

FIG. 1 is a front view of a molding apparatus showing an embodiment of the present invention.

FIG. 2 is a plan view of a molding device.

FIG. 3 is an enlarged sectional view taken along the line AA of FIG.

FIG. 4 is a perspective view of a filter pad.

FIG. 5 is a perspective view of an upper mold.

6A is a sectional view taken along line BB of FIG. 5, and FIG. 6B is a sectional view taken along line CC of FIG.

7A is an enlarged cross-sectional view of an air inlet portion of a U-groove rubber member, and FIG. 7B is an enlarged cross-sectional view of another portion of the U-groove rubber member.

FIG. 8 is a process diagram illustrating a filter pad separation process,
(A) is a diagram showing a state before separation, (b) is a diagram showing a state when a suction pad is placed on the upper surface of a press-formed product,
FIG. 3C is a diagram showing a state when the press-formed product is adsorbed on the adsorption pad and separated from the filter pad.

FIG. 9 is a process diagram showing a manufacturing process of a ceramic building board.

[Explanation of symbols]

12 ... Upper mold, 17 ... Stand, 18 ... Lower mold, 21 ... Cavity, 22 ... Suction box (vacuum dehydrator), 24
... Water hole, 25 ... Molding material, 26 ... Intake port, 28 ... Drain port, 30 ... Filter pad, 33 ... Guide rail, 34
... Cam, 36 ... Cylinder for vertically moving rail, 37 ... Roller, 38 ... Cylinder for lower mold slide, 43 ... U groove rubber member, 44 ... Air inlet port, 45 ... Through hole, 50 ... Press molded product, 51 ... Conveyor, 52 ... Filter pad separating device, 53 ... Suction box, 55 ... Adsorption pad, 5
7 ... Press base plate.

Claims (4)

[Claims] 1. A method of injecting a slurry-forming molding material into a cavity of a lower mold and lowering the upper mold while dewatering under reduced pressure to press-mold a ceramic building board, wherein a plurality of lower molds are slid and moved. Provided as possible, at the bottom of each lower mold, a reduced pressure dehydrator for decompressing and dehydrating the molding material in the cavity is provided, and the molding material is injected in the state where the filter pad is laid in the cavity of each lower mold, The molding material on the filter pad is preliminarily dehydrated by the decompression dehydrator, and the lower mold that has completed the preliminary dehydration is sequentially slid to the press molding position, and the molding material in the cavity of the lower mold is decompressed at the press molding position. A method for manufacturing a ceramic-type building board, characterized in that the upper mold is lowered and press-molded while being continuously dehydrated under reduced pressure by a dehydrator. 2. The plurality of lower molds are provided with rollers, and the guide rails are provided so as to be capable of moving up and down corresponding to the rollers, and when the lower molds after the preliminary dewatering are slid to a press molding position, the guide rails are moved. By raising the roller on the guide rail to raise the lower mold from the pedestal, and in this state, slide the lower mold to the press molding position along the guide rail, The method for manufacturing a ceramic building board according to claim 1, wherein during the press molding, the guide rail is lowered to return the lower mold to the state of being placed on the press base plate and press molding is performed. 3. A U-groove rubber member for both air intake and sealing is attached to the entire lower surface of the upper die with its groove opening facing inward, and is formed on the upper surface of the U-groove rubber member. The air intake port is communicated with an external air intake device through a through hole formed in the upper mold, and during press molding, the air intake device causes air in the upper part of the cavity to pass through the groove of the U-shaped rubber member. Press-molding while sucking, and as the press-molding progresses, the lower surface portion of the U-groove-shaped rubber member is crushed and the air suction port is closed by the lower surface portion of the U-groove-shaped rubber member. The method for manufacturing a ceramic building board according to claim 1 or 2. 4. When removing a press-molded product from the cavity, the press-molded product is adsorbed to the upper mold together with the filter pad by air suction force, taken out, and transferred to a filter pad separating step. In the separating step, a curved adsorption pad made of soft sponge is directed to the upper surface of the press-formed product and adsorbed by the air suction force, so that the press-formed product is temporarily moved along the curved shape of the adsorption pad. The method for manufacturing a ceramic-type building board according to claim 3, wherein the press-formed product is separated from the filter pad by deforming the press-formed product.