JP2561646Y2 - Tile dry press forming equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dry press forming apparatus for a tile for forming a powder material into a predetermined shape.

[0002]

2. Description of the Related Art Dry press forming apparatuses for forming a predetermined shape by pressing a powder raw material are widely used as tile forming apparatuses. Here, it is necessary to form a back groove on the back surface of the tile when forming the tile. Therefore, in a conventional dry press forming apparatus, a groove 102 is provided on a metal mold 100 as shown in FIG. By embedding a rubber block 104 therein, or as shown in FIG.
A convex portion 108 made of a rubber material is provided on the molding surface 107 by pasting on the molding surface 107, and the back surface of the tile 110 is molded on the molding surface 107, and at the same time, the back groove 112 is molded by the convex portion 108. ing.

The reason why the convex portion 108 is made of a rubber material is to form the back groove 112 into a dovetail shape based on its elastic deformation action. That is, if the convex portion 108 is made of a rubber material, the convex portion 108 is elastically deformed when the powder material is pressed as shown in FIGS. 112 is formed into a dovetail shape.

[0004] When the back groove 112 on the back surface of the tile 110 is formed in a dovetail shape, the adhesive force when the tile 110 is stuck to the surface to be processed with an adhesive such as mortar is increased, and the tile 110 is firmly formed. Can be fixed.

[0005]

In forming the dovetail-shaped back groove 112 on the back surface of the tile 110 by the convex portion 108 made of such a rubber material, the back surface is conventionally used when the press pressure is released and the mold is released. The opening edge of the groove 112 (FIG. 7)
(A portion 113 shown in (C)), that is, there is a problem that the so-called mogging is likely to occur, that is, the tip side surface portion of the sole is scraped off.

The main reason for this is that the release of the pressure causes the tile molded body to demold and expand in the direction indicated by the arrow in FIG. 7C (or the opposite direction), and the same part interferes with the convex part 108 during demolding. Is believed to be something.

To prevent this, as shown in FIG. 7D, the side surface 114 of the convex portion 108 is inclined at a predetermined angle with respect to a surface 120 parallel to the pressing direction (vertical direction in this case). The inclined shape, specifically, the side 1 of the convex portion 108
It is conceivable to form a shape inclined with respect to the surface 120 in the direction parallel to the pressing direction (vertical direction) passing through the base end of the fourteen.

If the inclination angle of the side surface 114 is increased, the generation of the moire can be prevented well. On the other hand, if the side surface 114 of the convex portion 108 has such a shape, the back groove 112 can be formed with a good dovetail. It cannot be formed into a groove shape.

[0009]

SUMMARY OF THE INVENTION The present invention solves such a contradictory problem, and provides a dry press forming apparatus for tiles capable of forming a good dovetail-shaped back groove while suppressing generation of mog. The gist of the invention is that the powder raw material filled in the molding space is pressed by a molding surface to form it into a predetermined shape, and a convex portion made of an elastic material protrudingly provided on the molding surface. In the dry press forming apparatus for a tile, which forms a dovetail-shaped back groove on the back surface of the tile, a hardness of 70 to 90 is used as an elastic material constituting the convex portion.
While using the side of the convex portion, the side of the convex portion, as proceeding from the base end side to the front end side, in a direction away from a plane parallel to the pressing direction passing through the base end and at 0 ° with respect to the surface. That is, the inclined surface is inclined at an angle of 3.2 degrees or less.

[0010]

[Effects of Action and Invention] The hardness of the elastic material is defined by JI
Spring type hardness test specified in SK6301 (A
Shape).

According to the present invention, the generation of the moiré and the shape of the back groove both depend on the inclination angle of the side surface of the convex portion made of an elastic material such as rubber. This is based on the knowledge that it is greatly affected by the hardness of the mold part.

That is, the present inventor conducted tests by changing the inclination angles of the side surfaces of these convex portions and the hardness of the convex portions, respectively.
It has been found that if the inclination angle of the side surface of the convex portion and the hardness of the convex portion are kept within specific ranges, it is possible to form a good dovetail-shaped back groove while suppressing the occurrence of mog.

That is, even if the side surface of the convex portion is inclined up to 3.2 degrees with respect to the surface parallel to the pressing direction in accordance with the present invention, a good dovetail groove can be obtained in relation to the hardness of the convex portion. It has been found that the back groove having a shape can be formed, and the hardness of the convex portion is preferably set to a hardness of 90 degrees or less. By setting the hardness of the convex portion to a predetermined value or less, the amount of deformation of the convex portion during pressing can be increased, and the back groove can be formed into a dovetail shape while compensating for the disadvantage of forming the side surface into an inclined shape.

However, the hardness of the convex portion needs to be 70 degrees or more. This is because if the hardness of the convex portion is lower than 70 degrees (soft), the amount of deformation of the convex portion becomes excessively large, and the convex portion deteriorates during repeated press molding, and the service life becomes extremely short. This is due to the fact that it cannot be practically used.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, in order to further clarify the features of the present invention, embodiments thereof will be described in detail below. In FIG. 2, reference numerals 10 and 12 denote a metal upper mold and a frame mold, respectively, and 14 denotes a bottom mold. A rubber sheet 16 is adhered to the surface of the bottom mold 14, and the surface of the rubber sheet 16 forms a molding surface.

The rubber sheet 16 is provided with a plurality of ridges, and these ridges constitute a projection 18 projecting from the molding surface. As shown in FIG. 1A, the convex portion 18 has a side surface 20 inclined at a predetermined angle θ with respect to a surface 22 parallel to the pressing direction passing through the base end.

FIGS. 3 and 4 show that the height h of the convex portion 18 is 2.
7 mm, and the powder raw material 24 (see FIG. 2) is dry-press-molded by variously changing the hardness of the rubber constituting the convex portion 18 and the inclination angle θ of the side surface 20 to form the tile 26. The relationship between the shape of the back groove 28, the inclination angle θ, and the rubber hardness is shown.

The vertical axis in the figure is the difference between the minimum opening width b (see FIG. 1B) of the back groove 28 and the maximum width dimension a. In addition, the figure also shows the dimension c in FIG. 1A, that is, the distance c between the base end and the upper end of the convex portion 18 together with the inclination angle θ.

From the results of FIGS. 3 and 4, it can be seen that when the inclination angle of the side surface 20 is larger than 3.2 degrees, the shape of the back groove 28 rapidly deteriorates, that is, it becomes difficult to obtain a good dovetail shape. The rubber hardness is set to 90 in relation to the shape of the side surface 20.
It can be seen that a good dovetail shape can be obtained by setting the angle in the range of -70 degrees.

FIG. 5 shows the relationship between the inclination angle of the side surface 20 of the convex portion 18 and the rubber hardness and the mog. From this figure,
It can be seen that when the inclination angle is larger than 0 degree and not more than 3.2 degrees and the rubber hardness is 90 to 70 degrees, generation of moiré is suppressed well.

When the convex portion 18 is made of an elastic material as described above, the bottom surface of the back groove 28 of the tile 26 obtained as shown in FIG. When 26 is adhered to the surface to be processed with an adhesive such as mortar, there is an advantage that the area of adhesion with the adhesive is increased due to the curved shape effect, and the adhesive strength is increased.

The embodiment of the present invention has been described in detail above, but this is merely an example. In the present invention, as shown in FIG. The present invention can be applied to the case of forming the upper surface of the tile. The present invention can be implemented with various modifications based on the knowledge of the trader.

[Brief description of the drawings]

FIG. 1 is a diagram showing a main portion of a convex portion of a dry press forming apparatus according to an embodiment of the present invention and a shape of a back groove of a tile obtained.

FIG. 2 is a cross-sectional view of a side cross-sectional configuration of the same device and a resulting tile molded body.

FIG. 3 is a diagram showing the relationship between the inclined shape of the side surface of the convex portion and the shape of the back groove as a result of a confirmation test of the effect of the apparatus of the embodiment.

FIG. 4 is a diagram showing a relationship between a rubber hardness and an obtained back groove shape as a result of a test for confirming the effect of the apparatus of the embodiment.

FIG. 5 is a diagram showing the relationship between the inclination angle of the side surface of the convex portion, the rubber hardness, and the mog as an effect confirmation test of the embodiment.

FIG. 6 is a cross-sectional view of a main part cross-sectional configuration of a conventional dry press forming apparatus and a tile formed body obtained.

FIG. 7 is an explanatory diagram for explaining the background of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Top mold 12 Frame mold 14 Bottom mold 16 Rubber sheet 18 Convex part 20 Side surface 22 Surface 24 Powder material 26 Tile 28 Back groove

Claims (1)

(57) [Scope of request for utility model registration] 1. A powder raw material filled in a molding space is pressed by a molding surface to form a predetermined shape, and a dovetail on the back surface of the tile is formed by a convex portion made of an elastic material protruding from the molding surface. In the dry press forming apparatus for tiles that are configured to form a groove-shaped back groove, while using a material having a hardness of 70 to 90 degrees as an elastic material constituting the convex portion,
As the side surface of the convex portion progresses from the base end to the front end, the side is separated from a plane parallel to the pressing direction passing through the base and away from the plane by more than 0 degrees and not more than 3.2 degrees. A dry press forming apparatus for tiles, characterized in that the inclined surface is inclined at an angle.