JPS633772Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a tile base forming mold that pressurizes clay between a front mold and a back mold to form a tile base of a predetermined shape.

PRIOR ART A front mold whose molding surface is constituted by a flat surface at the center and an inclined surface rising from the periphery of the flat surface, and a back mold having a molding surface opposite to the molding surface of the front mold. Conventionally, there has been a tile base forming mold in which a front mold and a back mold are brought relatively close to each other, thereby pressurizing the clay filled between them to form a tile base of a predetermined shape. provided.

For example, the device shown in FIG. 5 is one example, and in the figure, 10 and 12 are a pair of front and back molds that are arranged opposite to each other, and the back mold 12 of the front mold 10 is opposed to the back mold 12 of the front mold 10. A molding surface 14 is formed in the portion. The molding surface 14 has a shape corresponding to the surface of the tile base 16 (see FIG. 6) to be molded, and includes a flat surface 18 in the center and a direction toward the back mold 12 from the periphery of the flat surface 18. It is composed of an inclined surface 20 that rises while expanding. Further, a generally flat molding surface 22 corresponding to the back surface of the tile base 16 is formed in a portion of the back mold 12 facing the front mold 10 .

The front mold 10 and the back mold 12 are liner 24
and is adapted to be slidably fitted within the liner 24, thereby creating a space 28 within the liner 24 bounded by the molding surfaces 14 and 22 and the inner circumferential surface 26 of the liner 24. . By bringing the front mold 10 and the back mold 12 relatively close to each other, the clay 30 filled in the space 28 is pressurized, and then the liner 24 and the back mold 12 are separated from each other. , the tile base 16 is taken out as shown in FIG.

However, the tile base 1 obtained in this way
6, when the pressurized state is released as shown in FIG. 6, the portion protruding upward from the table mold 10 is allowed to expand outward; Since the enclosed portion is still prevented from expanding outward, cracks may occur at the boundary portion. In addition, the pressurized clay 30 may stick to the molding surface 14 of the top mold 10, making it difficult to release the molded tile base 16, or part of the tile base 16 may peel off during mold release. There was a risk that he might do something like that.

On the other hand, in order to solve this problem, a tile base mold has been proposed in which the flat surface 18 of the table mold 10 is coated with a rubber layer 32 having a predetermined thickness, as shown in FIG. That is, based on the elastic force of the rubber layer 32, the tile base 16 is pushed out from the table mold 10 when the pressurized state of the tile base 16 is released, thereby preventing the occurrence of cracks. Tile base 1
Since the adhesion force with the tile base 16 is weakened, the releasability of the tile base 16 is improved.

Problems with the Prior Art However, in the tile base mold coated with the rubber layer 32 in this manner, the rubber layer 32 is compressively deformed at the intersection A of the surface 34 of the rubber layer 32 and the slope 20 during pressure molding. When the tile base 16 is pressed, the peripheral portion of the rubber layer 32 fixed to the inclined surface 20 remains as a protrusion 36 as shown in FIG. 8, and wrinkles 38 as shown in FIG. There was a new problem in that the problem occurred. In addition, the dashed-dotted line shown in FIG. 8 represents the surface 34 of the rubber layer 32 before pressurization.

Solution In order to solve such problems, the present invention
A predetermined rubber layer is integrally provided over the entire surface of the flat surface at the center and the sloped surface rising from the periphery of the flat surface, which constitute the molding surface of the table mold, and
The thickness of the rubber layer on the sloped surface is made thinner than the thickness of the rubber layer on the flat surface.

Function In such a tile base mold, when the front mold and the back mold are brought relatively close to each other, the clay filled between them is pressurized, and the tile base of the desired shape is formed. Ru. At this time, the rubber layer is also compressed and deformed at the same time, but since the rubber layer is provided over the entire molding surface of the table mold, the part of the rubber layer corresponding to the shoulder of the tile base, that is, the flat surface of the table mold, No protrusions or the like are produced in the portion located at the connection between the surface and the inclined surface due to compressive deformation. Therefore, wrinkles and the like do not occur on the shoulders of the molded tile base. In addition, at the peripheral edge of the rubber layer, that is, at the edge of the inclined surface on the side away from the flat surface, a stepped portion is formed due to the thickness of the rubber layer, etc., and the resulting tile base is Although wrinkles or flaws may occur, since these areas are originally the boundary between the surface and side surfaces of the tile base, there is no problem in terms of the aesthetic appearance of the tile base.

Furthermore, when the front mold and back mold are relatively separated after such pressure molding, the compression state of the rubber layer is released, and the molded tile base is exposed based on the elastic force of the rubber layer. extruded from the mold. In other words, the thickness of the rubber layer located on the inclined surface of the table mold is
Since the rubber layer is made thinner than that of the rubber layer located on the flat surface, the amount of deformation of the rubber layer during pressure molding is large on the flat surface, and therefore the rubber layer when the pressure is released is The elastic force of the layer is greater when pushing the tile base from the flat side than from the slope side, and the tile base is pushed out based on this elastic force.
Note that the above-mentioned deformation of the rubber layer occurs when the rubber layer on the inclined surface is configured to gradually become thinner from the connection part with the rubber layer on the flat surface toward the edge. The rubber layer on the inclined surface becomes larger as it approaches the rubber layer on the surface. In addition, the adhesion force between the tile base and the rubber layer is smaller than when the tile base and the surface are in direct contact.
The tile substrate can be easily peeled off from the rubber layer. As a result, the expansion of the tile base due to release of the compressed state is allowed throughout, eliminating the risk of cracks occurring in the tile base, and making it easier to release the tile base from the mold.

Embodiments Next, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail based on the drawings. In the following description, parts common to those of the conventional example are given the same reference numerals and detailed description will be omitted.

First, FIG. 2 is a cross-sectional view showing the main parts of an insertion type tile base forming mold which is an embodiment of the present invention. It is a surface type that can be separated.
A molding surface 4 is provided on the portion of the front mold 40 that faces the back mold 12.
2 is formed, and its molding surface 42 is connected to the back mold 1.
A flat surface 44 at the center parallel to the molding surface 22 of No. 2
and an inclined surface 46 that rises from the periphery of the flat surface 44 while expanding toward the back mold 12. Note that in this embodiment, the flat surface 4
4 is a quadrilateral with sloped surfaces 46 on its four sides, but it goes without saying that the flat surface 44 may have other shapes such as circular or triangular depending on the desired surface shape of the tile base. .

A molding surface 42 of the top mold 40 is coated with a rubber layer 48 . The rubber layer 48 is urethane rubber,
It is made of a rubber material such as silicone rubber, and its hardness is such that it can be appropriately elastically deformed during pressure molding of the clay 30, for example, about 80 to 95 degrees (JIS-K-6301). stipulated in Further, the rubber layer 48 is provided over the entire surface of the molding surface 42, and as shown in the partially enlarged view of FIG.
The thickness t ₁ of the rubber layer 48 located on the flat surface 44 is
It is thicker than the thickness _t2 of the rubber layer 48 located on the inclined surface 46, and is about 0.2 to 1.5 mm. Slope 4
The thickness t ₂ of the rubber layer 48 located on the flat surface 4
Although the thickness is gradually reduced from the connecting portion 50 with 4 toward the edge 52, the portion located at the edge 52 also has a slight thickness d. Note that the bent portion 56 where the surface 54 of the rubber layer 48 rises along the inclined surface 46 is the connecting portion 5 of the molding surface 42.
It is said to be slightly closer to the outside than 0.

In the tile base forming mold configured as described above, when the front mold 40 and the back mold 12 are brought relatively close to each other, the clay 30 filled in the space 28 is pressurized, and the clay 30 is Tile base 5 shown in Figure 3
It is molded as shown in 8. Here, during this pressure molding, the rubber layer 48 is compressively deformed, but since the rubber layer 48 is provided over the entire molding surface 42, the bending portion 56 is compressed and deformed due to the compressive deformation. No protrusions or the like will occur nearby. Therefore, wrinkles and flaws do not occur on the shoulders of the molded tile base 58, and the tile base 58 has a smooth surface.

On the other hand, the peripheral portion of the rubber layer 48, that is, the inclined surface 4
There is a thickness d in the portion located at the edge 52 of the rubber layer 48, and a slight thickness also exists at the open end where the molding surface 42 of the table mold 40 is formed, so that the surface 54 of the rubber layer 48 and the liner A step portion 60 is formed at the connection portion of 24 with the inner circumferential surface 26 . Therefore, a stepped portion 62 is also formed at the connection portion between the surface and the side surface of the molded tile base 58, but the tile base 58
After firing, tiles 8 are often used in large numbers in rows as shown in FIG. 3, and there is no risk that the appearance of the tiles will be impaired by the presence of the stepped portions 62. On the contrary, the existence of such a certain degree of thickness has the advantage that the durability of the surface mold 40 and the rubber layer 48 is greatly improved. In addition, as shown in FIG. 4, the peripheral part of the rubber layer 48 and the surface mold 40
Of course, if the thickness of the opening end of the opening end is made thinner and sharper, the stepped portion 62 can be eliminated.

After pressure molding in this way, the back mold 12
When the tile substrate 58 and the liner 24 are separated from each other, the tile substrate 58 and the rubber layer 48 are released from compression. Therefore, the rubber layer 48, which had been compressed until then, returns to its original state due to its elastic force, and the tile base 58 is thereby pushed up onto the top mold 40. That is, the thickness t ₁ of the rubber layer 48 on the flat surface 44 is greater than the thickness t ₂ of the rubber layer 48 on the inclined surface 46 , and the thickness t ₂ extends from the connecting portion 50 to the edge 52 . Since the rubber layer 48 on the flat surface 44 becomes thinner toward the top, the force that pushes the tile base 58 upward is stronger than the force that the rubber layer 48 on the slope 46 pushes the tile base 58 from the side. is larger, and the tile base 58 can be easily extruded based on the elasticity of the rubber layer 48.

Note that a rubber layer 48 is provided over the entire surface of the molding surface 42 of the table mold 40, and the molded tile base 58
Since it is only in contact with the surface 54 of the rubber layer 48, its adhesion is small and the tile base 58 can be easily peeled off from the rubber layer 48.
Further, in order to further facilitate extrusion of the tile base 58, it is desirable that the inclination angle θ of the inclined surface 46 is 60 degrees or less. Furthermore, if the inclination angle θ is small (gentle), even if the thickness of the rubber layer 48 on the inclined surface 46 is simply made thinner than that on the flat surface 44, You can enjoy similar effects.

Then, when the pressure molding operation is canceled and released from the compressed state as described above, the tile base 58 is formed by the extrusion action of the rubber layer 48 as shown in FIG. ) Lifting up and bulging to the side is allowed, so that cracks etc. do not occur in the tile base 58 molded, and the tile base 58 can be easily released from the top mold 40. There is no risk that a part of the tile base 58 will stick to the table mold 40 and be damaged during demolding.

In the above explanation, the present invention was applied to an insertion type tile base mold, but it goes without saying that the present invention can also be applied to other types of tie base molds. Furthermore, it is also possible to implement various modifications and improvements in the material and thickness of the rubber layer 48 based on the knowledge of those skilled in the art.

Effects of the Invention As detailed above, according to the tile base forming mold according to the present invention, wrinkles etc. do not occur in the shoulders of the tile base to be molded, and a tile base with a smooth surface shape can be obtained. , cracks and cracks do not occur when the compressed state is released. Moreover, it becomes easy to release the tile base from the surface mold, and there is no risk of damage to the tile base during release.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the main parts of a tile base mold according to an embodiment of the present invention, and is a partially enlarged view of the table mold shown in FIG. 2. FIG. 2 is a sectional view showing a part of a tile base forming mold which is an embodiment of the present invention. FIG. 3 is a front view of a plurality of tile bases molded by the tile base mold of FIG. 2 arranged side by side. FIG. 4 is a sectional view showing a main part of another embodiment of the present invention, and corresponds to FIG. 1. FIG. 5 is a sectional view showing an example of a conventional tile base mold. FIG. 6 is a sectional view showing another operating state of the tile base forming mold of FIG. 5. FIG. 7th
The figure is a sectional view of a main part showing another example of a conventional tile base mold. FIG. 8 is an enlarged view of section A in FIG. 7. FIG. 9 is a front view showing a tile base molded by the tile base mold of FIG. 7. FIG. 1st
FIG. 0 is an explanatory diagram showing a state in which the pressure forming operation of the tile base mold according to the present invention is released. 12: back mold, 30: clay, 40: front mold, 42:
Molding surface, 44: flat surface, 46: inclined surface, 48: rubber layer, 50: connecting portion, 52: edge, 58: tile base.

Claims (1)

[Claims for Utility Model Registration] (1) A tile base mold that presses and shapes clay between a front mold and a back mold, and the flat surface of the central part that constitutes the molding surface of the front mold. A predetermined rubber layer is integrally provided over the entire surface of the sloping surface rising from the periphery of the flat surface, and the thickness of the rubber layer on the sloping surface is less than the thickness of the rubber layer on the flat surface. A tile base mold that is characterized by being made to be thinner. (2) The thickness of the rubber layer on the sloped surface gradually becomes thinner from the connection part with the flat surface toward the edge of the sloped surface, as described in Claim 1 of the Utility Model Registration Claim. Tile base mold. (3) The tile base mold according to claim 1 or 2, wherein the rubber layer is formed of a urethane rubber material.