JPH0524498Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a tile extrusion molding machine, and more particularly to a technical means for preventing undulating deformation of the tile surface.

(Prior Art) Generally, a plurality of back grooves 100 are formed on the back surface of a tile, as shown in FIG. 7. This is done by engaging an engaging member in the back groove 100 to fix the tile 102, or
Alternatively, this is to allow a fixing material such as mortar to bite into the back groove 100.

By the way, tile 10 with back groove 100 like this
When No. 2 was extrusion molded, there was a problem that the tile surface was deformed into a wavy shape as shown in FIG. 8 during the process of drying or firing the molded tile.

In extrusion molding of the tile 102, the kneaded base material is continuously extruded from a die of an extrusion molding machine, and each back groove 100 of the tile 102 is formed by a plurality of back groove forming molds arranged in the die. At this time, the resistance of the flow to the base material and the degree of compression of the material inside the die differ greatly between the part where the back groove forming mold is located and the part between them. A difference in raw material density occurs between the part and the sole 104 part between them (the density of the part where the back groove 100 is formed is greater than that of the sole 104 part), and for this reason, when the molded tile 102 is dried and fired. As a result, the shrinkage rate of the tile becomes uneven, resulting in a wavy deformation of the tile surface, with the back groove 100 forming part becoming convex and the sole foot 104 forming part becoming concave, as described above.

(Means for solving the problem) The present invention was made to solve the above problem, and its gist is to continuously form tiles by extruding the kneaded base material through a die at the tip. , a plurality of back groove forming molds having a cross-sectional shape corresponding to the back groove of the tile are arranged in the hollow interior of the die, and each of the back groove forming molds forms the plurality of back grooves of the tile. In the extrusion molding machine, a baffle plate having a wavy uneven portion at the tip thereof is arranged such that the uneven portion faces the opening on the back side of the die, and each convex shaped portion of the uneven portion corresponds to the back groove mold. It is directly or indirectly fixed to the back surface of the die through another member so as to be located at the desired position.

(Operation and Effects of the Invention) As described above, in the extrusion molding machine of the present invention, the baffle plate is arranged on the back side of the die, and the concave and convex portions of the baffle plate face the opening on the back side of the die, and the convex shaped part is positioned corresponding to the back groove mold, so when the base material flows into the die,
In the portion where the back groove mold is located, the amount of raw material flowing into the die is restricted by flow resistance due to the convex portion of the baffle plate. As a result, the flow resistance of the raw material within the die and the compression rate of the raw material are equalized between the portion where the back groove mold is located and the portion between them. Therefore, the raw material density of the back groove forming part and the sole part of the tile molded body extruded from the die is equalized, and the shrinkage rate when the tile molded body is dried and fired is also equalized in each part, so that the above-mentioned This will prevent the wavy deformation that occurs.

(Example) Next, an example of the present invention will be described in detail based on the drawings.

2 and 3 show the tip of the extrusion molding machine. In the figure, 10 is a cylindrical body, and an iron plate 12 having a hollow hole is fixed to the tip of the cylinder. A molding die 14 is attached. The die 14 has a rectangular molding recess 16 for molding two tiles together, as shown in FIG.

A die 18 is disposed inside the cylindrical body 10. The die 18 is configured to connect a fixing main body 20 and the cylindrical body 10.
The tile has a number of balls 22 extending in the axial direction. The tip of each ball 22 is formed into a molding section 24 shaped to correspond to the back groove of the tile, as shown in Figures 5 and 6. Thin fins 26 are formed at the upper and lower middle positions on both sides of the molding section 24. These fins 26 are used to make cuts to separate the tiles molded in two pieces after drying or firing.

As shown in FIGS. 1 and 4 to 6, a pair of baffle plates 30 having wavy uneven portions 28 at their tips are disposed on the back side of the iron plate 12. These baffle plates 30 have uneven portions 28
It is positioned so that it faces the opening on the back side of the recess 16 of No. 4, and so that each convex shaped part 32 protrudes toward the opening side and is positioned opposite to each of the punched balls 22, and is fixed to the iron plate 12 by screws 34. ing. The fixing portion to the iron plate 12 is an elongated hole 36, so that the mounting position can be finely adjusted up and down.

Next, the operation of extrusion molding a tile using the apparatus of this example will be explained.

The raw material kneaded in the kneading section passes through the tip of the cylinder 10 and is then continuously extruded through the rectangular recess 16 of the die 14. When the raw material passes through the molding recess 16 of the die 14, in the conventional device, resistance to the flow of the raw material and the degree of compression of the raw material are generated in the area where the punched balls 22 are located and the area between them. This causes the wavy deformation of the tile. However, in the device of this example, the baffle plate 30 is provided on the back side of the iron plate 12, so the effect of the baffle plate 30 causes Tokitama 2
The flow and compression rate of the base material are equalized between the portion where No. 2 is located and the portion between them. in particular,
The pair of baffle plates 30 are formed in the molding recess 16 of the die 14.
Since the convex-shaped portion 32 of the uneven portion 28 facing the opening is located opposite to each punched ball 22, when the raw material passes through the baffle plate 30 and flows into the inside of the die 14, the punched balls 22 are positioned. Dice 14 in part
The amount of raw material flowing into the tank is restricted.

As mentioned above, the reason why the tile surface is deformed into a wavy shape is that the raw material density in the back groove forming part is higher than the raw material density in the sole foot part, that is, the raw material density in the part where the punched balls 22 are located in the die 14. This is because the density of the raw material in the die 14 is higher than the raw material density between them, and if the flow of the raw material into the die 14 is restricted in the area where these punched balls 22 are located, the density of the raw material in the die 14 will be The raw material density of the molded tile is also equalized between the back groove forming part and the back foot part. Therefore, the shrinkage rate when the tiles are dried or fired is also equalized, and the above-mentioned wavy deformation does not occur.

Although the embodiments of the present invention have been described in detail above, the present invention can also be configured in other forms.

For example, the shape of the concavo-convex portion of the baffle plate 30 can be made into another shape, and the amount of protrusion of the die 14 into the molding recess can be changed as appropriate.
Furthermore, the present invention can be applied to extrusion molding tiles of various shapes, and the baffle plate can be directly fixed to the back surface of the die in some cases. It is possible to configure the system with various modifications based on the knowledge of

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main parts around the baffle plate of an extrusion molding machine that is an embodiment of the present invention, and FIGS. FIG. Fig. 4 is a front view of the main part of the mounting part of the baffle plate in Fig. 1 seen from the back side, and Figs. 5 and 6 are a front sectional view and a longitudinal cross-section of the main part of the baffle plate mounting part, respectively. It is a front view. FIG. 7 is a perspective view of a main part of an example of a tile with a back groove, and FIG. 8 is a front view of a main part of the tile in a deformed state. 12... iron plate, 14... die, 22... punched ball, 24... forming part, 28... uneven part, 30...
Baffle plate, 32...Convex shaped part.

Claims (1)

[Claim for Utility Model Registration] The kneaded base material is extruded from a die at the tip to continuously form a tile, and a plurality of back groove forming molds with cross-sectional shapes corresponding to the back grooves of the tile are inserted into the hollow interior of the die. In an extrusion molding machine that is arranged to form a plurality of back grooves of a tile using each of the back groove forming molds, a baffle plate having a wavy uneven portion at its tip is arranged such that the uneven portion is Fixed indirectly or directly to the back surface of the die through another member so as to face the opening on the back side of the die and so that each convex portion of the uneven portion is located at a position corresponding to the back groove mold. A tile extrusion molding machine characterized by: