JPH0620736B2 - Molding method for building boards - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for molding a building board such as a flat roof tile,
More specifically, the present invention relates to a method for forming an undried cured plate material (hereinafter referred to as a green sheet), and more specifically to a technique for performing hole processing with a simple configuration.

[Background Art] Conventionally, punching with a punching pin or the like is conceivable for making holes in a green sheet that is continuously supplied after papermaking as a raw material for forming a building board, but this processing method requires a lower mold. Therefore, it is difficult to carry out the hole processing for the green sheet that has been made into paper and transferred by the carrier plate. Therefore, in order to form a green sheet into a predetermined shape and form a small hole in it, it is usually performed by post-processing with a grinder, a grindstone, a cutter, etc. However, there is a problem in that the cutting tool is severely worn.

[Object of the Invention] The present invention has been made in view of such problems,
An object of the invention is to provide a method for forming a building board, which is capable of easily making holes in a green sheet with a simple structure.

DISCLOSURE OF THE INVENTION According to the method for forming a building board of the present invention, an undried uncured board material 1 is punched with a hollow cylindrical blade 3 having an edge portion 2 edging, and punched into the blade 3. The punching object 4 is returned to the hollow hole 5 of the plate material 1 by air pressure when the blade 3 is lifted, and the punching object 4 is removed after curing and curing. It has been achieved. That is, since the punched object 4 punched in the hollow cylindrical blade 3 is returned to the hollow 5 by air pressure and the punched object 4 is removed after curing and curing, the hole cutting on the green sheet is not performed. It is designed to be easily performed without the use of tools.

Embodiments of the present invention will be described in detail below with reference to the drawings.

Board material 1 is like asbestos cement board material,
The paper is made into a undried uncured state, and is molded into a roof tile made of asbestos cement board. The blade 3 is attached to an upper die 8 that press-molds the outer shape of the flat roof tile B, the edge portion 2 has a punched hole shape, and the blade 3 itself has a hollow cylindrical shape. An airtight packing 10 is interposed between the upper die 8 and the base plate 9, a pipe line 11 formed on the base plate 9 is communicated with the hollow inside of the blade 3, and an air pipe 12 is used to connect air. Can be pumped into the hollow inside of the blade 3.

Then, the plate material 1 placed on the carrier plate 6 via the felt 7 and transferred is lowered by the base plate 9 to move the upper mold 8
The forming blade 13 and the edge portion 2 of the blade 3 are inserted into the plate material 1 to be formed, and the punched object 4 is punched by the hollow cylindrical blade 3. In such a case, the punched object 4 has entered the blade 2, and as the platform 9 is lifted, air is pumped from the air pipe 12 into the hollow inside of the blade 3,
The punched product 4 is returned to the hollow hole 5 of the plate material 1. In such a case, the pressure switch 14 is attached to the air pipe 12.
Is provided, and the punched object 4 is the blade 3 by the air pressure.
It may be possible to automate by issuing an alarm or the like by detecting a pressure increase when the pressure does not escape from the inside. After that, after curing and curing in the curing process,
The punched object 4 is removed, and the holes in the green sheet can be easily formed without using any cutting tool.

[Effects of the Invention] In summary, according to the present invention, since the punched object punched in the hollow cylindrical blade is returned to the hollow hole by air pressure and the punched object is removed after curing and curing, the hole to the green sheet is formed. There is an advantage that machining can be performed without using any cutting tool, and that even if the hole machining shape is complicated, it can be easily performed.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a press-cut plate material according to an embodiment of the present invention, FIG. 2 is a schematic side sectional view showing a forming method of the same, and FIG. 3 shows a cutting tool in a portion A of FIG. Bottom view,
FIG. 4 is a partial bottom view of the same edge part as above, FIG. 5 is a side view of the same as above, and FIG. 6 is a plan view showing a flat plate roof tile as above, where 1 is a plate material, 2 is an edge part, Reference numeral 3 is a blade, 4 is a punched object, and 5 is a hollow hole.

Claims (1)

[Claims] 1. An undried uncured plate material is punched with a hollow cylindrical blade having a punched shape, and the punched material punched into the blade is pressed by air pressure when the blade is lifted. A method for forming a building board, which is characterized in that the material to be punched is removed after being cured and cured by being returned to the hollowed hole.