JP2875734B2 - Tile mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tile molding die used in a dry molding method of a tile in which a tile material made of powder is filled into a mold and compression molded.

[0002]

2. Description of the Related Art Hitherto, on a tile to be attached to a wall surface or other surface, a back foot made of uneven streaks is formed on the back surface in order to enhance the adhesion effect of the tile.

[0003] As a method of forming such a back foot by dry molding, an uneven portion for forming a back foot is integrally formed on the surface of a metal tile back mold, and the tile raw material filled on the tile back mold is formed. Is formed by compressing / compressing with a tile back mold and an upper mold to form a back foot with a metal uneven portion (first conventional technique).

[0004] As shown in FIG. 9, a back mold for forming the above-mentioned back foot is provided on the surface of a metal back mold main body 1.
Back foot forming plate 2 made of an elastic material having uneven portions 2a and 2b
As shown in FIG. 10, and further, as shown in FIG. 10, a back foot forming block 3 made of an elastic material is protrudingly mounted on the surface of the metal back mold main body 1 so as to be embedded and mounted. There is also one in which a convex portion 4 and a concave portion 5b are formed (second conventional technique).

Further, as shown in FIG. 11, a mat-shaped rubber body 8 having a flat entire surface is placed on the upper surface of a lower mold 7 in a mold frame 6 and a liquid 9 is poured into the rubber body 8. There is also proposed a structure in which a tile material 10 is filled in the rubber body 8 and the tile material 10 is press-formed with an upper mold 11 (Japanese Utility Model Publication No. 4-32251) (No. 3).
Conventional technology).

[0006]

As in the first prior art, in the case where the back foot is formed by a convex portion of a back mold,
In the case where the convex portion is formed of the same metal as the back mold, when the tile material filled thereon is pressed by an upper mold having a flat pressing surface, the raw material is compressed by the convex portion. When,
The compression of the raw material in the recess is greater in the former than in the latter.

[0007] In particular, as in recent years, when the sole foot groove is further deepened in order to prevent the peeling accident of the tile applied to the wall surface, the above-mentioned difference in compression becomes large, and the material after compression of the raw material is reduced. The molding density is not uniform throughout the tile. For this reason, when the molded body is fired in this state, the shrinkage of the fired body is not uniform, and it is impossible to obtain an accurate shape due to deformation. Also, it is very difficult to obtain a uniform filling density due to the characteristics of the powder and the structure of the filling device, especially when filling the tile raw material into the molding die. And the deformation after firing increases.

[0008] Further, as in the second prior art shown in FIGS. 9 and 10, a metal back mold having only a convex portion made of an elastic material provided on the surface thereof is press-formed. In some cases, variations in molding density caused by non-uniformity of compression and uneven filling of raw materials as described above are slightly absorbed, but the absorbing effect cannot be satisfied.

In the case where the mat-shaped rubber body 8 is provided as in the third conventional technique, for example, as shown in FIG.
When there is unevenness between the low-density part B and the low-density part B, the thickness of the pressed compact becomes thicker in the high-density part A, becomes thin in the low-density part B, becomes uneven, and the deformation during firing becomes large. There's a problem. Further, when a load is applied to the liquid pressure inside the rubber body 8, there is a problem that the flatness of the surface is impaired.

[0010] Therefore, even if the above-mentioned soles are formed by forming a convex part for molding the soles on the surface of the rubber body 8, the unevenness in the filling of the raw material may cause a variation in molding density. The size after firing tends to be poor.

Accordingly, an object of the present invention is to solve the above-mentioned conventional problems and to provide a mold for a tile capable of forming a tile with a deep sole muscle, which is hardly deformed by firing shrinkage. And

[0012]

According to the present invention, in order to solve the above-mentioned problems, the surface is formed to be uneven and the projections (2) are formed.
3a) is a sole foot forming plate (2) formed to have elasticity.
3) is firmly fixed to the surface of the lower mold (22) in the concave portion (23b), and the lower mold (22) is located at each convex portion (23a) of the back foot forming plate (23). Then, a cavity (22a) communicating with the projection (23a) is formed, and all the cavities (22a) communicate with each other, and the cavity (22a) is hermetically filled with a liquid (33a). It is characterized by having done.

[0013]

When the tile material (41) is filled on the back foot forming plate (23) and the tile material (41) is pressurized by the upper mold (31), the pressure acting on the tile material (41) is increased. The convex part (23a) and the concave part (23b) of the molded plate (23)
While acting from the surface side, the tile raw material (41) is compression molded to a predetermined thickness.

At this time, a high pressure is generated in the compact (41a) in the place where the raw material filling density is high even in the same convex part (23a), for example, in the convex part (23a ₁ ) in the part A in FIG. As a result, the projection (23a ₁ ) is strongly pushed down. On the other hand, in the place where the raw material filling density is low, for example, in the convex portion (23a ₂ ) in the portion B in FIG. 6, the pressure generated in the compact (41a) is low, and the convex portion (23a ₂ ) in that portion is pushed down only weakly. Absent.

Therefore, the hollow portion (2) in the convex portion (23a ₁ ) in the portion where the high pressure is generated as described above.
2a ₂₎ in the liquid (33a ₁₎ is pushed down, the extruded liquid cavity (22a ₂₎ to be fed the liquid (33a ₂ of the convex portion in the low pressure is generated portion (23a ₂₎ ) Rises and pushes up the back foot forming plate (23) of the convex portion (23a ₂ ) to form the forming plate (41) from below.
Compress a).

Thus, each convex portion (23a ₁ ) (23
The raw material in a ₂ ) is uniformly compressed, and each protrusion (23)
The pressure acting laterally from the upper part of a) to the upper part of the concave part (23b) becomes uniform. Therefore, even when the packing density of the raw material is low, a lateral pressure is applied to the raw material on the upper portion of the concave portion (23b) in the same manner as in the case where the density is high, so that a molded article having substantially uniform density can be obtained.

The thickness of the molded body in the groove portion (the sole of the tile) formed by each of the projections (23a) varies slightly, but the thickness in the portion formed by the concave portion (23b) is small. Body thickness is constant.

As described above, since the thickness and density of each concave portion (23b), which is a reference of the thickness of the tile, can be made the same, if this molded body is fired, a good-quality tile with extremely little deformation can be obtained.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to FIGS. FIG. 1 is a sectional view showing one embodiment of a tile forming die according to the present invention.

In FIG. 1, reference numeral 21 denotes a fixed mold which forms a raw material filling space 21a. 22 is lower type (back type)
The surface is fixed in such a manner that its surface is located in the raw material filling space 21a. A hollow portion 22a is formed in the lower die 22 so as to penetrate the lower die 22 in the front and back directions. As shown by a broken line in FIG. 2, the hollow portion has a long hole shape and a predetermined length in the front-rear direction of the lower die 22 (vertical direction in FIG. 2). The lower die 22 is further formed in parallel with a predetermined interval d in the left-right direction (the left-right direction in FIG. 2). The length of the interval d is set such that the cavity 22a is located at a portion other than the sole of the tile to be formed, that is, at a portion where the concave portion is formed.

Reference numeral 23 denotes a thin-plated back foot forming plate made of an elastic material such as urethane rubber, which is provided on the surface of the lower mold 22. The back foot forming plate 23 is located above the hollow portion 22a and extends over the entire length in the front-rear direction (vertical direction in FIG. 2).
And convex portions 23a formed in parallel in the left-right direction (the left-right direction in FIG. 2) where the hollow portions 22a exist,
It is formed by integrally molding a concave portion 23b formed other than the convex portion 23a. Then, the recess 23b is inserted into the lower mold 22.
And the projection 23a is bent and deformed inward and outward. The bottom surfaces of both ends (upper and lower ends in FIG. 2) 23c of the convex portion 23a are formed on the same plane as the bottom surface of the concave portion 23b, and are fixed to the lower mold 22 in a watertight manner.

As a method of fixing the back foot forming plate 23 to the lower mold 22, for example, as shown in FIG. 8, a filling 24 for forming a convex part is formed in a cavity 22a of the lower mold 22, and the upper end thereof is formed. The upper mold 25 is set so as to protrude from the surface of the lower mold 22, the upper mold 25 is set on the upper part, a monomer such as urethane rubber is poured into the mold hole formed by these, and after the curing, the filling 24 is removed. This is adhered to the lower mold 22 by curing, and is fixed by a coating method in which a thin back foot forming plate 23 is formed.

Reference numeral 26 denotes a mold base for supporting the lower mold 22. The mold base has a liquid introduction passage 27 formed therein and a communication passage 27a communicating from the liquid introduction passage 27 to all the cavities 22a. Have been.

The mold base 26 and the lower mold 22 are connected to each other by bolts 29 with a packing 28 interposed therebetween.
Reference numeral 30 denotes a molding platen for supporting the mold base 26. An upper die 31 pressurizes the tile raw material filled in the raw material filling space 21a. The upper die surface (lower surface) is formed as a flat surface, and is raised and lowered by a lifting drive means (not shown).

Reference numeral 32 denotes a liquid-to-pneumatic converter, in which a liquid 33 is stored in the lower half of the body, and an upper half becomes a gas phase 34,
The air in the gas phase portion 34 is in contact with the surface of the liquid 33.
Reference numeral 35 denotes a pneumatic pressure source, which communicates with the gas-phase part 34 of the liquid-to-pneumatic pressure converter 32 through a pressure control valve 36 so that a predetermined air pressure acts on the liquid 33. 37 is a pressure gauge.

Reference numeral 38 denotes a connection pipe, one end of which is in open communication with the bottom of the liquid / pneumatic converter 32, and the other end of which is in communication with the liquid introduction path 27. Reference numeral 39 denotes a check valve provided in the connection pipe 38, which permits the flow in the direction of the liquid introduction path 27 and prevents the flow in the opposite direction. 40 is a stop valve.

Reference numeral 33a denotes a liquid that is filled in each of the cavity portions 22a, and the liquid is also filled in the fluid introduction path 27 and the communication path 27a. These liquids are supplied to the liquid 33 in the liquid-to-pneumatic converter 32 through the connection pipe 38.
Is linked to

Numeral 41 indicates the tile material filled in the material filling space 21a. Next, the operation of the present embodiment will be described. In the above-described structure, first, the air pressure supplied from the air pressure source 35 is adjusted to a predetermined air pressure (for example, in a range of 0 to ² kg / cm ² ) by the pressure adjusting valve 36, and the air pressure of the liquid-to-air pressure converter 32 is adjusted. The liquid 33 is caused to act on the phase portion 34 to pressurize the liquid 33 to a predetermined pressure. Then, the pressure applied to the liquid 33 propagates to the liquid filled in the connection pipe 38, the liquid introduction path 27, and the communication path 27a, and increases the pressure of the liquid 33a filled in the entire cavity 22a to the same pressure. Due to the pressure of the liquid 33a, the convex portion 23a of the back foot forming plate 23 formed of the elastic material receives the pressure on the inner surface, and becomes a slightly upwardly convex convex shape as shown in FIG. The reason why the preload is applied in this way is to prevent the convex portion 23a from being excessively dented by the pressurization during the subsequent molding.

Next, under the above-mentioned pressurized state, a predetermined amount of the tile raw material 41 is filled in the raw material filling space 21a, and then the filled tile raw material 41 is lowered by moving down the upper mold 31.
A predetermined pressure is applied from the upper surface (the state of FIG. 6).

When the tile raw material 41 is compressed under pressure,
As shown by arrows in FIG. 6, the pressure acting on the tile raw material 41 causes the protrusions 23a and the recesses 23b
Then, while acting from the surface side, the tile raw material 41 is compression-molded to a predetermined thickness.

At this time, even if the projections 23a are the same,
A place where the packing density is high, for example, the protrusion 23 in the portion A in FIG.
a₁In this case, a high pressure is generated in the molded body 41a,
3a ₁Is strongly pushed down. On the other hand, raw material packing density is low
However, for example, the projection 23a in FIG._TwoThen molding 4
1a has a low pressure, and the convex portion 23a _Two
Can only be pushed down weakly.

However, the protrusions 23a₁And the projection 23a_Two
Cavity 22a in₁And 22a_TwoIs the liquid introduction channel 27
The fluid is pneumatically communicated with each other by the check valve 39.
Because it does not escape to the converter 32 side, its cavity
Part 22a₁And 22a_TwoLiquid 33a₁And 33a_TwoOccurs on
Pressure is the same as Pascal's principle.
Become. Therefore, the part where high pressure is generated as described above
Convex part 23a in minute ₁Press the back foot forming plate 23 of
Bent to form a cavity 22a₁Liquid 33a in₁Push
The extruded liquid is lowered and generates low pressure
Convex portion 23a_TwoHollow part 22a_TwoSend to
Liquid 33a_TwoRises, and the convex portion 23a_Twoof
The back foot forming plate 23 is pushed up to press the forming plate 41a from below.
Shrink.

Next, the pressurized state according to the present invention and the pressurized state according to the prior art shown in FIG. 9 and FIG.
The comparison will be described with reference to FIG. As shown in FIG. 7, when the tile raw material 41 is compressed at a pressure of about 250 to 350 kg / cm ^2, it becomes a molded body 41a having a thickness that is about half the raw material filling depth.

Assuming that the raw material filling depth d is 20 mm, the thickness of the compact is 10 mm, and the height of the convex portion is 2 mm, the compression ratio of the compact 41a in the concave portion D on the surface of the lower mold C is as follows. 20/10 = 2. The compression ratio of the molded body 41a in the convex portion E is (20-2) / (10-2) = 18.
/8=2.25, and the location of the convex portion E is more strongly compressed.

Since the tile material is a powder, the principle of Pascal is not applied unlike the liquid, but a slight force acts not only in the vertical direction but also in the horizontal direction as indicated by the arrow in FIG. Since a pressure is applied from the portion above the portion E to the raw material above the concave portion D, the concave portion D having a low pressure ratio
However, the density of the molded body 41a is slightly improved.

However, in the conventional molds shown in FIGS. 9 and 10, when there is unevenness in the packing density of the raw material, the compression density of the compact is higher at a lower packing density than at a higher packing density. Both the shaped part E and the concave part D remain low. Therefore, the force acting laterally from the convex portion E to the concave portion D is weaker at the lower density portion, and the lateral force acts at the lower compression ratio of the concave portion D to increase the density. It cannot be corrected to get close to the place.

On the other hand, in the present invention, since the compression density at the upper portion of the convex portion E becomes almost uniform as described above, the compression density at the upper portion of the convex portion E is shifted from the upper portion of the concave portion D in the lateral direction. The acting pressure becomes uniform. Therefore, even when the packing density of the raw material is low, a lateral pressure is applied to the raw material above the concave portion D in the same manner as in the case where the density is high, so that a molded body 41a having a substantially uniform density can be obtained.

Incidentally, the convex portion 2 in the above-mentioned sole foot forming body 23
The means for pressurizing the liquid acting on 3a is not limited to the apparatus shown in FIG.

[0039]

As described above, according to the present invention, even if the tile raw material filled in the forming die has uneven density in the molding of the tile with back soles, it is difficult to obtain the same during firing after the pressure forming. The deformation of the tile is extremely small, and a good-quality tile can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view of a lower mold provided with a back foot forming plate.

FIG. 3 is a sectional view taken along line XX in FIG. 2;

FIG. 4 is a sectional view taken along line YY in FIG. 2;

FIG. 5 is a diagram in which a back foot forming plate is expanded in FIG. 4;

FIG. 6 is a view for explaining a pressing force in FIG. 4;

FIG. 7 is a diagram illustrating a pressing force.

FIG. 8 is a longitudinal sectional view for explaining a method for manufacturing a sole foot forming plate.

FIG. 9 is a sectional view showing a conventional structure.

FIG. 10 is a sectional view showing another example of the conventional structure.

FIG. 11 is a sectional view showing still another example of the conventional structure.

FIG. 12 is an explanatory view of the structure in FIG. 11;

[Explanation of symbols]

22 Lower mold 22a Cavity 23 Back sole forming plate 23
a: convex portion 23b: concave portion 33a: fluid (liquid)

──────────────────────────────────────────────────の Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B28B 7/16 B28B 3/02 B28B 7/20

Claims (1)

(57) [Claims] 1. A back foot forming plate having an uneven surface and a convex portion having elasticity is adhered tightly to the surface of a lower mold in the concave portion. It is characterized in that a cavity is formed at each projection on the foot forming plate and communicates with the projection, and all the cavities communicate with each other, and the liquid is hermetically filled in the cavity. Tile mold.