JPH0133337B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides slopes, recesses, steps,
The present invention relates to a method for manufacturing tiles with special shapes such as curved surfaces by extrusion molding.

[Conventional technology]

In the case of the rubber square method, which is a tile tip construction method, a tile 1 having an inclined surface 2 formed on the side surface 1a of the tile is used, as shown in FIG. 6(a). This is to prevent each tile 1 from falling off when the tile unit is attached to the formwork, and to improve the adhesive strength of the tile 1 to the wall surface to which it is attached after concrete is poured. In addition, there are other tiles with specially shaped side surfaces, such as a tile 3 in which stepped portions 4 are formed on the tile side surfaces 3a and 3b, as shown in FIG. 6b,
As shown in Figure c of the same figure, there are tiles 5 and the like having curved surface portions 6 formed on the tile side surfaces 5a and 5b, so as to obtain an aesthetically excellent tile wall surface.

Conventionally, when manufacturing tiles having these specially shaped side surfaces by extrusion molding, the extrusion molding machine 7 shown in FIGS. 7 and 8 was used in the manner described below. That is, for example, when manufacturing the tile 1 shown in FIG.
Piano wires 11, 11 for cutting the dimension between a and 1b into a predetermined size are stretched over the mold opening 8a of the mold 8. The plastic clay extruded by the extruder 10 has a space 13c (see FIG. 7) formed by the inner ball 9 for forming the sole 1c, and the inner ball 10 forms a space 13c (see FIG. 7) for forming the sole foot 1c. 2 is formed, and the tiles are continuously extruded with the back surfaces 1d of the tiles joined together. After this continuous extrusion molded body 12 is roughly cut into predetermined dimensions, it is forced in a direction perpendicular to the extrusion direction and passed through a finishing cutter (not shown) in which piano wire is stretched. As a result, a molded body green material 13 shown in FIG. 9 is obtained. After that, it is divided into upper and lower halves through processes such as drying, glazing, and firing, to obtain the tile 1 as a product. That is, in this extrusion molding, two product tiles 1 are obtained from one green body 13. This is a commonly used technique in extrusion molding methods.

[Problem that the invention seeks to solve]

However, in the conventional extrusion molding method, the inclined surfaces 2 of the tile side surfaces 1a and 1b are
There is a large difference between the extrusion space area A where the medium ball 10 exists and the extrusion space area B where the medium ball 9 exists. Therefore, there is a difference in molding pressure between the plastic clay extruded through the extrusion space area B and the plastic clay passed through the extrusion space area A. In other words, area B with a large occupied space
The forming pressure acting on the plastic clay passing through is small,
The molding pressure acting on the plastic clay passing through the small area A of the occupied space increases. As a result, the packing density of the plastic clay passing through the region A becomes extremely larger than the packing density of the plastic clay passing through the region B, and a difference in thermal expansion and contraction occurs between the clay passing through each region during firing. However, the tile 1 itself has the disadvantage of causing deformation such as concave warping.

Further, in the case of the conventional extrusion molding machine 7, as shown in FIGS. 7 and 8, a technique for cutting the tile side surfaces 1a and 1b to a predetermined size is a piano wire 1.
1 and 11 are used. Therefore, it is easy to bend, and if there are variations in the size of the particles of the plastic clay, the large particles will come into contact with the piano wires 11, 11 and move the piano wires 11, 11 in the left and right direction in FIG. There was a drawback that the tile side surfaces 1a and 1b became irregular surfaces due to bending. The bending of the piano wires 11, 11 is also due to the fact that the piano wires 11, 11 are usually attached at a distance a from the mold opening 8a of the mold 8 (see FIG. 7). If the tile side surfaces 1a and 1b have unplanned and irregular surfaces as described above, the tile 1 cannot be attached to the rubber square during construction at the site, and the tile 1 has to be removed as a defective product.

Furthermore, the dimension between the tile side surfaces 1a, 1b is determined by changing the distance between the piano wires 11, 11 and moving the sliders 14, 14 at the same time. The dimension d shown in FIGS. 8 and 9 changes, and in order to keep d constant, the mounting positions of the medium balls 10, 10 must also be changed, which is troublesome.

[Purpose of the invention]

The present invention improves and eliminates the above-mentioned drawbacks of the conventional technology, and prevents deformation of tiles such as concave warping, and also prevents the side surfaces of tiles from becoming irregular surfaces. It is an object of the present invention to provide a method for extrusion molding side tiles with special shapes.

[Means for solving the problems] The means of the present invention for solving the above problems are as follows:
A method of manufacturing tiles with special shapes such as slopes, recesses, steps, curved surfaces, etc. on the side of the tile by extrusion molding, in which the sole of the back of the tile is molded with a medium ball placed in a mold. With the back surfaces of the tiles joined together, the plastic clay is extruded, and the side surfaces of the tiles are cut into a predetermined special shape using a thin plate-like cutting blade attached to the opening of the mold.

[Effect]

As is clear from the embodiments shown in FIGS. 1 to 4, the tile side surfaces 1a and 1b (see FIG. 6 a) are cut using the cutting blade 23 attached to the mold opening 21a. 1a and 1b are formed into a special shape such as an inclined surface 2. Therefore, the packing density of the plastic clay in the mold 23 is only based on the difference between the region C where the inner ball 22 for forming the sole 1c exists and the region D where it does not exist. The thickness of this medium ball 22 is not so large, and the difference in packing density of the plastic clay between the regions C and D is small. Therefore, the difference in thermal expansion and contraction rates between the regions C and D is small, and the tile 1 does not undergo deformation such as concave warpage.

In addition, the cutting blade 23 has higher rigidity than the conventional piano wire 11 (see FIGS. 7 and 8), and is also firmly fixed to the mold opening 21a, so that the cutting blade 23 is secured to the mold opening 21a. It does not warp due to the size of the soil particles, but rather has the effect of leveling it out, and the tile side surfaces 1a and 1b obtained as cut surfaces do not become irregular. That is, it is possible to obtain uniform tile side surfaces 1a and 1b.

The method of the present invention will be explained below with reference to the drawings, based on an example of molding the green body 13 shown in FIG. 9 and the tile 1 shown in diagram a of FIG. 6. It is.

〔Example〕

FIG. 1 is a perspective view showing an extrusion molding machine 20 to which the method of the present invention is applied, and FIG. 2 is a front view thereof.
As shown in the figure, in the center of the mold 21, a medium ball 22 for forming the sole 1c is supported in a cantilever manner. Also, the mold opening 21a of the mold 21
A cutting blade 23 shown in FIG. 3 is provided at both ends of the long hole 30.
It is fixed with a screw 24 or the like via the . This cutting blade 23 has a depth l (see Fig. 1) of 2 to
It is made of a 6 mm iron plate or steel plate, and is designed so that when it is attached to the mold opening 21a of the mold 21, the cut parts 31a and 31b (see Fig. 4) on both ends of the plastic clay can pass through it without support. It has an opening 25 larger in area than the cutout portions 31a and 31b at both ends. Further, the blade portion 23a of the cutting blade 23 is
The thickness t is set to 1 mm, and when viewed from the front in the state shown in FIGS. 2 and 3, it is bent into the same shape as the side surfaces 13a and 13b of the green body material 13 shown in FIG. . In FIGS. 1 and 2, reference numerals 26 and 26 are sliders for determining the width dimension of the molding space 27 of the mold 21.

As shown in FIG. 4, the plastic clay extruded from the extruder 28 is first placed in the mold 21 to form a space 13c for forming the sole 1c (see diagram a in FIG. 6) with the medium ball 22. The tile is then extruded from the mold opening 21a with the back surface 1d of the tile joined. Then, in the mold mouth 21a, both ends thereof are cut by the cutting blade 23, and the cut portions 31a, 31
b is discarded. In this way, by cutting and forming the tile side surfaces 1a and 1b having the concave portions 2 outside the mold 21, the molding pressure of the plastic clay inside the mold is adjusted to the area C where the center ball 22 is present. There is not much difference in area D where it does not exist,
There is no large error in the packing density of the plastic clay passing through both regions C and D. For this reason, when the green body material 31 that has been continuously formed is roughly cut and finished cut into predetermined dimensions, dried, glazed, and fired, the portion of the green body material 31 that has passed through both areas C and D is , there is no difference in thermal expansion and contraction during firing,
No deformation such as concave warpage occurs. Therefore, the tile 1 obtained by dividing the fired molded body into upper and lower halves has the expected size and shape, and has excellent quality.

In addition, the cutting blade 23 has high rigidity, and the mold opening 21
Since the cutting blade 23 is firmly fixed to a, even if the particle size of the plastic clay varies, the cutting blade 23
Rather, the cutting blade 23 acts as a trowel to uniformly level the surface. That is, the planned regular tile side 1
It is possible to obtain a, 1b. Note that the leveling effect increases as the depth l of the cutting blade 23 increases, but since a problem arises in terms of rigidity, it may be set appropriately.

Furthermore, the dimension between the tile side surfaces 1a and 1b can be determined by simply changing the mounting position of the cutting blade 23 through the elongated hole 30, which eliminates the troublesome task of rearranging the medium ball 10 (see Fig. 8) as in the past. No work required.

Figures a to d in Fig. 5 show other modified embodiments of the cutting blade 23, in which figures a and b are those in which a step is formed on the side surface of the tile, and figure c is the side surface of the tile. Figure d shows the case where a concave portion is formed on the side surface of the tile, and FIG. d shows the case where a curved surface portion is formed on the side surface of the tile. As described above, the method of the present invention can be modified as appropriate depending on the shape of the planned side surface of the tile. It goes without saying that the shape and size of the extrusion molding machine 21 can be changed as appropriate.

〔Effect of the invention〕

As explained above, in the present invention, since the side surface of the tile is cut and shaped with a cutting blade attached to the mold opening, there is no variation in the filling density of the plastic clay in the green material of the molded body. Therefore, there is no error in the coefficient of thermal expansion and contraction during firing, and it is possible to prevent tile deformation such as concave warping. Furthermore, the cutting blade has high rigidity and is firmly fixed, making it possible to form a planned regular tile side surface without being affected by variations in the particles of the plastic clay. That is, it is possible to extrude side tiles with a special shape of excellent quality, and the occurrence of defective products can be significantly suppressed. Furthermore, the dimension between the side surfaces of the tile can be easily changed by simply moving a cutting blade through a long hole or the like.

[Brief explanation of drawings]

1 to 5 are related to the present invention,
Fig. 1 is a perspective view of the extrusion molding machine, Fig. 2 is a front view of the same molding machine, Fig. 3 is a front view of the cutting blade, and Fig. 4 is a perspective view explaining the extrusion molding procedure by the extrusion molding machine.
Figures a to d in Figure 5 are front views showing other modified embodiments of the cutting blade, Figures a to c in Figure 6 are perspective views showing types of special shaped tiles, and Figure 7 is a conventional Perspective view of an extruder showing the method, No. 8
The figure is a front view of a conventional extrusion molding machine, and FIG. 9 is a perspective view showing a green body of a molded body. 1a, 1b...Tile side, 2...Slanted surface, 4
...Stepped portion, 6...Curved surface, 1...Tile, 1d...
Back side of tile, 1c... Sole foot, 21... Molding mold, 2
2... Medium ball, 21a... Mold mouth, 23... Cutting blade,
20...Extrusion molding machine.

Claims (1)

[Claims] 1 A method of manufacturing tiles with special shapes such as slopes, recesses, steps, curved surfaces, etc. on the side surfaces of the tiles by extrusion molding, in which the soles on the back of the tiles are molded with a medium ball placed in a mold. A special shape characterized by extruding the plastic clay with the back surfaces of the tiles joined together, and cutting the side surface of the tile into a predetermined special shape using a thin plate-like cutting blade attached to the mold opening of the mold. Extrusion method for side tiles.