JPH0344178B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The term "glass mosaic" used in the title of the invention and the scope of claims of this specification refers to a single mosaic tile in the form of a plate made of glass. In the following detailed description of the invention, these will be tentatively referred to simply as glass tiles.

In addition, in this specification, the contraction that occurs when cooling the glass and the contraction that occurs when cooling the mold will be described as ``shrinkage'' and ``shrinkage rate'' instead of ``linear expansion'' and ``linear expansion coefficient.'' do.

"Industrial Application Field" The present invention relates to a manufacturing mold used for manufacturing glass tiles that exhibit strong adhesion when attached to a wall surface.

``Prior art'' Traditionally, glass tiles were produced by charging molten glass into a molding recess made up of a lower mold and a frame mold, and then molding the upper mold into the mold and cooling it. Therefore, it was manufactured to have a plate-like shape.

``Problems to be Solved by the Invention'' In the conventional manufacturing of glass tiles, it is almost impossible to provide soles like those formed on the back of ceramic tiles, and it is difficult to manufacture them efficiently. I couldn't hope for it. This is because glass tiles are manufactured by charging molten glass into molding recesses and cooling it, as described above. To make this more understandable, first, a method for manufacturing ceramic tiles will be explained.

There are two methods for producing ceramic tiles: dry and wet. Among these methods, the dry method for manufacturing ceramic tiles is carried out using a mold 1 as shown in FIG. 5A. In the same figure, mold 1
consists of an upper mold 2, a lower mold 3, and a frame mold 4, and a plurality of sole molding recesses 3b, 3b, . . . are arranged on the molding pressing surface 3a of the lower mold 3. Then, the molding recess 6 formed by the lower mold 3 and frame mold 4 is filled with clay, and the upper mold 2 is fitted therein and heated and pressurized.
Immediately thereafter, the molded tile body is discharged from the mold 1. Ceramic tiles made using the dry process can be formed along any desired uneven shape formed on the molding pressing surface of the lower mold 3 and/or the upper mold 2. Therefore, the soles, which have a dovetail cross-section and are thought to produce the most favorable anchoring effect, that is, the strongest anchoring force, when affixing tiles to a standing wall, etc., should also be strip-shaped. It can be easily formed by.
However, the ceramic tile body provided with the dovetail soles is extruded in the direction shown by the white arrow in FIG. 5B and removed from the mold. That is, the upper mold 2 and the frame 4 are once removed from the lower mold 3', and then the lower mold 3'
A strip-shaped concave part 3 for forming soles penetrated through the upper surface of the
The tile body 5 is extruded along b' (which has a dovetail-like cross-sectional shape).

As is obvious from the above explanation, the manufacturing method and molding die for ceramic tiles cannot be used for glass tiles. In other words, the method for manufacturing ceramic tiles involves demolding the tile body after heating and pressurizing the tile body without waiting for it to cool down.
In contrast, glass tiles cannot be removed from the mold unless the molten glass at 1,300 to 1,500° C. is sufficiently cooled in the mold until it becomes hard enough not to be deformed by external forces. The temperature at this time is approximately 200°C.
In other words, when manufacturing this glass tile, the mold and the glass undergo different contractions, and it is almost impossible to match them. Generally, the shrinkage value of glass is 5 to 8 x 10 ^-6 /°C, whereas the shrinkage value of a mold is 10 to 18 x 10 ^-6 /°C.

Here, for example, a molding die 1' as shown in FIG. 5B is used for manufacturing glass tiles. FIG. 6 is an enlarged front sectional view showing the mold 1' and the glass being cooled in that case. Let us consider part A of the mold 1' (lower mold 3') as shown in the figure as a reference in the shrinking process. As mentioned above, during cooling, the mold shrinks more than the glass. Therefore, each part B, C, and D of the mold 1' contracts as if pressing the glass in the bottom molding recess 3b' of the lower mold 3' toward the part A, and tightens it strongly. Become. If the mold is forcibly removed in this state, the glass dovetail portion that has been painstakingly formed will be damaged. In this case, especially the sole molding recess 3 at the right end of the drawing.
Needless to say, the glass in b′ is the most easily damaged.

``Object of the Invention'' The present invention has been made in view of the above-mentioned circumstances, and provides a glass tile with a dovetail-like cross-section sole that has an extremely strong adhesion force when attached to a vertical wall surface, etc. It is an object of the present invention to provide a mold that can be manufactured efficiently (hereinafter referred to as the mold of the present invention).

"Structure of the Invention" (Means for Solving the Problems) Plantar foot forming grooves having a dovetail-shaped cross section were bored in parallel in the lower mold or the upper mold. Then, a demolding taper with respect to the groove width and a mold demolding gradient with respect to the groove depth are applied to the sole forming groove so as to spread in the same direction, and the widening end of the sole forming groove is connected to the lower mold or the upper mold. The opening faced the side edge of the

(Function) Since a demolding taper and a demolding slope are provided in the sole forming groove, demolding can be easily performed even if the shrinkage rates of the glass and the mold are greatly different. As a result, molded glass tiles that exert a large adhesion force when attached to vertical walls, etc., have come to be manufactured with high efficiency.

(Example) The present invention will be described below with reference to the drawings. In each of the drawings shown below, the demolding taper and demolding slope applied to the mold of the present invention are exaggerated to the extent that they can be visually understood.

FIG. 1 shows a glass tile manufactured using the mold of the present invention, and is a perspective view taken from the back side thereof. As shown in the figure, sole feet 7 having a dovetail-shaped cross section are formed in a strip shape on the back surface of the glass tile manufactured using the mold of the present invention.

FIG. 2 is a partially cutaway perspective view showing the mold of the present invention. The mold of the present invention is composed of an upper mold 8, a lower mold 9, and a frame mold 10, each of which is made of case-hardened steel (shrinkage rate: 12 to 15×10 ⁻⁶ /° C.). The mold of the present invention also includes an extrusion mechanism 1 for demolding.
2 is attached. The main structure of the mold of the present invention is in the lower mold 9.

The lower mold 9 has three sole forming grooves 9b, 9b, 9b formed in its molding pressing surface 9a with their center lines parallel to each other. The sole forming groove 9b is provided so as to span the opposite sides of the molding pressing surface 9a of the lower mold 9, and has a dovetail-like cross-sectional shape.

FIG. 3 is a side sectional view showing a state in which the frame mold 10 and the lower mold 9 of the mold according to the invention are assembled together, and FIG. 4 is a plan sectional view. As shown in FIG. 3, the bottom surface portion 9b' of the sole forming groove 9b is formed in the lower mold 9 such that the depth d near one side is smaller than the depth d' near the other side. A downward slope is provided from one side to the other side. The slope has an inclination of 0.62°. Further, as shown in FIG. 4, the inner surfaces 9b'', 9b'' of both side walls of the sole forming groove 9b are such that the width w near one side is smaller than the width w' near the other side. , a taper is provided so as to widen toward the same side as the slope of the bottom surface portion 9b'. Its taper angle is 2.49°. The taper of the inner surfaces 9b'' and 9b'' of both side walls and the slope of the bottom surface 9b' act synergistically to facilitate demolding.

When glass tiles are manufactured using the mold of the present invention thus constructed, the process is usually carried out under the following order and conditions.

First, in FIG. 2, molten glass is charged into a molding recess 11 formed by a lower mold 9 and a frame mold 10. The molten glass is soda-lime glass, and its shrinkage rate is 8.5×10 ⁻⁶ /°C. Also,
The temperature at the time of charging was 1300°C. Then, after combining the upper mold 8 with this, the upper mold 8 is heated at 50Kgf/cm ²
Pressure was applied. This pressure is applied to sufficiently spread the molten glass into the sole forming groove 9b of the lower mold 9. Then, in this state, wait for the temperature of the molten glass in the mold of the present invention to cool down to about 200°C. After that, the upper mold 8 and frame mold 10 are separated from the lower mold 9, and the glass tile is pushed out toward the widening end of the demolding slope and demolding taper made in the sole forming groove 9b of the lower mold 9. Bye.

(Study of Alternative Embodiments) The sole forming groove 9b provided in the mold of the present invention is not limited to the one provided through the molding pressing surface 9a of the lower mold 9, and the mold removal slope and mold release taper spread. It is sufficient that only the end portions are open facing the side edges of the lower mold 9. In this way, the shape and configuration of the mold of the present invention can be changed as appropriate depending on the embodiment.

"Effects of the Invention" As is clear from the above description, according to the mold of the present invention, it is now possible to extremely easily provide a sole having a dovetail-shaped cross section on a glass tile.
Therefore, the production efficiency of glass tiles that exhibit strong adhesion when pasted can be dramatically improved, and glass tiles can be made to meet as many demands as ceramic tiles. Summer. Furthermore, when manufacturing ceramic tiles, it goes without saying that if the mold of the present invention is used, demolding can be performed more smoothly than before.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a glass tile manufactured using the mold of the present invention, shown from the back side, Fig. 2 is a partially cutaway perspective view of the mold of the present invention, and Fig. 3 is the book shown in Fig. 2. FIG. 4 is a side sectional view showing the mating state of the lower mold of the invention mold and the frame mold, and FIG. 4 is a plan sectional view showing the mating state of the lower mold of the invention mold and the frame mold in FIG. 5
Figure A is a perspective view showing a conventional molding die, Figure 5B is a perspective view showing the demolding state when adding dovetail soles to a ceramic tile, and Figure 6 is a perspective view of the mold in Figure 5B. It is a front sectional view explaining that the sole of a glass tile breaks when molten glass is charged into a mold. 7... Sole foot, 8... Upper type, 9... Lower type, 10...
...Frame shape, 9b...Sole forming groove.

Claims (1)

[Claims] 1 A mold consisting of a lower mold, a frame mold, and an upper mold,
A plurality of sole forming grooves having a dovetail-shaped cross section are bored in the lower mold or the upper mold with their center lines parallel to each other, and the sole forming groove has a demolding taper with respect to the groove width. and a demolding slope relative to the groove depth are formed so as to spread in the same direction, and the widening end of the sole molding groove is open facing the side edge of the lower mold or the upper mold. Mold for glass mosaic production.