JP2656957B2 - Forming method of arc-shaped inorganic decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for forming an arcuate inorganic decorative plate.

[Problems of the prior art]

The applicant of the present application previously used a mixture of glass cullet, aluminum oxide, bentonite, a colorant (metal oxide), a binder and water as a molding material, and pressed and molded it into a plate, and formed this plate. The fired material was further fired at a temperature of about 850 ° C., and after firing, the surface of which was finished by polishing was proposed.

This inorganic decorative board is mainly used for a wall material and a floor material for the interior and exterior of a building, and is naturally used for decorative purposes such as a column.

By the way, the arc-shaped decorative board used in the above-mentioned pillar has been conventionally produced as follows.

First, the above-mentioned molding material is put into a mold of a press molding machine, and is subjected to pressure molding to produce an arc-shaped pressure-molded plate. The press-formed plate is then fired in a firing furnace, and the surface on the side to be a decorative surface after firing is polished to produce a decorative plate.

However, in the above-mentioned conventional manufacturing method, if softening or shrinkage occurs during firing, there is a problem that dimensions (shape) at the time of pressure molding cannot be maintained and large deformation occurs. Therefore, there was a problem that it was very difficult to do so and the workability was poor.

[Means for solving the problem]

The present invention has been made to solve the above-mentioned problem, and a flat inorganic decorative plate mainly composed of glass cullet whose surface side after firing is polished and finished is formed into a molding lower surface having a concave arc surface portion. Placed on a mold and set, heated in a heat treatment furnace in this state, softens the inorganic decorative board, bends it along its concave arc surface by its own weight, and then continues heating the inorganic decorative board The decorative plate is formed into a predetermined circular surface by pressing the decorative plate from above with a molding upper die having a convex circular surface portion corresponding to the circular arc surface portion in the concave lower die. The present invention proposes a method for forming a circular arc-shaped inorganic decorative plate.

〔Example〕

 Hereinafter, examples of the present invention will be described.

The inorganic decorative board molded according to the present invention is made of the following molding material.

Glass cullet: 50 to 80 parts by weight Aluminum oxide: 10 to 40 parts by weight Bentonite: 3 to 30 parts by weight Colorant (metal oxide): 3 to 30 parts by weight Water is added in an amount of 3 to 10 parts by weight, and the mixture is further mixed with water to form a slurry and then granulated by a spray drier.

In the above, the glass cullet to be used is made of ground scrap glass (soda glass, borosilicate glass, etc.) that is broken or cut off as unnecessary parts during the manufacture of glass products. Those having a passed particle size are particularly suitable for use.

If the above glass cullet is less than 50 parts by weight, it is not porcelain, and if it is more than 80 parts by weight, the fire resistance is too low to maintain its shape.

Next, as the aluminum oxide (Al ₂ O ₃ ), alumina which is commercially available as a pulverized form as an alumina is usually used, and one having a particle diameter of 4.0 μm to 5.0 μm is particularly suitable.

If the amount of the above aluminum oxide (alumina) is less than 10 parts by weight, the bending strength becomes low.

Bentonite is suitable as the clay component used in the present invention. This bentonite is a very fine clay, the main mineral is montmorillonite,
In particular, those that have passed through a 180 mesh screen are suitable for use.

If the amount of the bentonite is less than 3 parts by weight, the moldability is poor, and if it exceeds 30 parts by weight, the firing temperature becomes high.

The colorant varies depending on the desired color development. For example, red iron oxide (Fe ₂ O ₃ ), red, chromium oxide, green, titanium oxide, yellow-white, cobalt oxide, etc. One or more metal oxides such as blue, iron oxide (Fe ₂ O ₄ ), black, etc. are appropriately used.
Those that have passed through a 150 mesh sieve are suitable for use.

If the amount of the coloring agent exceeds 20 parts by weight, the sintering becomes insufficient due to the metal oxide, so that the porcelain cannot be formed.

In the present invention, a small amount of an organic and water-soluble binder is used to impart shape retention. This binder is polyvinyl alcohol (PVA), methyl cellulose (M
C), polyvinyl butyral, acrylic resin, etc. are used, among which polyvinyl alcohol is suitable,
The binder is degreased in the process of heating and firing.

The above organic binder can provide sufficient shape retention and appropriate viscosity with a small amount, and is not particularly used in some cases.

In addition, water is added to the granulated mixture during molding by adding 3 to 10 parts by weight of water.
If the amount of water is less than 3 parts by weight, the shape retention is deteriorated and cracks and cracks are generated. If the amount is more than 10 parts by weight, lamination (lamination) occurs during press molding, and blisters occur during firing.

Then supplying the molding material into the roller forming machine, with a molding pressure of 200kg / cm ² ~400kg / cm ² continuously formed in a plate shape by aircraft.

Then, the pressed molded plate is cut into a predetermined shape (length) by a cutter.

Then, the cut pressure-formed plate is baked at a maximum temperature of 830 ° C. for about 3 hours by a roller hearth kiln while being transferred.

After firing, one surface 1a serving as a decorative surface is polished and finished to form a flat inorganic decorative plate 1 as shown in FIG.

Next, a method for forming a semicircular inorganic decorative board 1 'as shown in FIG. 5 using the inorganic decorative board 1 will be described.

First, in addition to the inorganic decorative plate, a heat treatment furnace 2, a lower mold 3, and an upper mold 4 as shown in FIG. 1 are prepared. As the heat treatment furnace 2, a gas or electric furnace is used. 2a shows the heat source. Then, a lower mold 3 having a concave arc-shaped surface portion 3a is set in the heat treatment furnace 2, and a convex portion is provided above a position where the lower mold 3 is set (on the ceiling side of the furnace) via a pulley 6 installed outside the furnace. An upper die 4 having an arcuate surface 4a is set in a state of being suspended by a wire 7 so as to be vertically movable. As shown in FIG. 2, the lower die 3 has both side plates 3b, 3b opposed to each other at a predetermined interval, and supports them by supporting rods 3c, 3c.
The two side plates 3b, 3b are formed with a large number of mounting holes 3d on the circumference centered on the upper surface center portion 0, and the mounting holes 3d, 3d opposed to the two side plates 3b, 3b are formed. A small-diameter forming rod 3e is rotatably erected between them. Then, by connecting the inner surfaces of the erected many forming rods 3e, a concave arc-shaped surface portion 3a for forming and holding the decorative plate 1 is formed. Further, the arrangement of the mounting holes 3e is formed on a plurality of circumferential lines having different radii centered on the central portion 0, and a mounting hole 3e on a desired circumferential line is selected to form a forming rod 3e. By inserting and installing the decorative board, decorative boards having desired arcs having different radii can be formed. Further, when the pitch of the adjacent mounting holes 3d is made as small as possible and the diameter of the forming rod 3e is made as small as possible, the finished surface of the decorative board in the bent state can be made smooth and beautiful. Each member constituting the lower mold 3 is made of stainless steel having heat resistance of about 1000 ° C.

As shown in FIG. 3, the upper die 4 is formed by bending a steel plate 4b made of stainless steel downwardly in a semicircular shape and forming a convex arc-shaped surface portion 4a on the outer surface thereof. And it is suspended and supported by the wire 7 so as to be vertically movable as described above. The radius of the arc surface portion 4a of the upper die 4 is set to a radius obtained by excluding the thickness of the decorative plate 1 from the radius of the arc surface portion 3e formed by the forming rod 3e.

Next, the method of the heat treatment will be specifically described. As shown in FIG. 1, the inorganic decorative board 1 on the flat plate is placed on the lower mold 3 set in the furnace 2 with both forming rods 3 positioned at the top.
e, 3e, and the upper mold 4 is set further upward. Next, the furnace is operated based on the temperature program shown in FIG. 6, and the decorative board 1 is heated. 630 ° C inside the furnace by this heating
Then, the decorative board 1 placed on the lower mold is softened and starts to bend along the arc portion 3a due to its own weight, and the bend becomes further larger when the maximum temperature state is maintained for 45 minutes. Finally, the upper mold 4 is pushed down from the almost bent state, the plate is pressed, the plate is corrected to the final arc shape, and the bending is completed. When this bending operation is completed, the heat source of the furnace is stopped, and air is blown into the furnace to be air-cooled. When the temperature inside the furnace has dropped to 300 ° C, open the furnace door and wait for the temperature to fall outside the furnace.
And lift off the semicircular inorganic decorative board 1 'as shown in FIG.

The arc-shaped inorganic decorative plate 1 'heat-treated in this manner shows a slight decrease in gloss on its polished surface 1a', but the original beautifulness can be shortened in a short time by polishing with a hand-type polisher. It can be finished in a state.

Table 1 shows an example of the heat treatment conditions and the results in the present invention. In Table 1, the gloss before and after the heat treatment was measured using a portable gloss meter (Murakami Color Research Laboratory, CMX-202).

When the heat treatment conditions were the maximum temperature (firing temperature) of 830 ° C, holding time of 1 minute, load (weight) of 37.5 g / cm ² and load time of 1 minute, a part of the polished surface Bukkake (baked baku) is produced, but these are small and can be removed relatively easily with a hand-type grinder, and can be polished in a short time. Also, under the above heat treatment conditions, it is naturally possible to form a small arc surface.

In the above-mentioned bending method, the arc length to be formed is set to be a half circle of the entire circumference (total length) of the arc, but actually, as shown in FIG. , 1/3 to 1/4 circle. In addition, the thickness of the inorganic decorative board to be bent is 5 mm to 2 mm.
It can be molded up to about 5mm.

Next, another embodiment of the present invention shown in FIGS. 8 and 9 will be described.

In this embodiment, a large number of trolleys 10 equipped with the lower mold 3 are
The tunnel type heat treatment furnace 11 is continuously loaded from the inlet 12 and unloaded from the exit 13, and the upper mold 4 as described above is installed at a substantially central portion in the tunnel type heat treatment furnace 11. The above-mentioned flat inorganic decorative board is continuously formed into the above-mentioned arc-shaped inorganic decorative board.

In this embodiment, each of the carts 10 is intermittently conveyed to a rail 14 by a drive source (not shown), and a position detecting means (not shown) for detecting that the carriage 10 is located below the upper die 4. By the operation of the stopper 15 and the shaping bar 3e of the lower die 3 on the trolley, the shaping bar 3e is accurately positioned corresponding to the lower portion of the upper die 4. The upper mold 4 is moved up and down by the hydraulic cylinder 16 and presses the decorative plate on the lower mold 3 by the set oil pressure.

〔The invention's effect〕

In the method for forming an arc-shaped inorganic decorative plate in the present invention, the flat inorganic decorative plate is polished before bending, that is, the bent plate is polished. In comparison, the polishing work is easy, can be performed in a short time, and can be finished beautifully.

Further, since the inorganic decorative plate is bent by its own weight and finally bent by the press die without being forcedly bent by the pressing die from the beginning of the bending process, stress is hardly left on the decorative plate, and after molding, Damage is reduced.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a heat treatment furnace for explaining a molding method of the present invention, and FIG. 2 shows a lower mold for molding.
Is a front view, and (B) is a side view. FIG. 3 is a front view of an upper mold for molding, FIG. 4 is a perspective view of a flat inorganic decorative plate,
FIG. 5 is a perspective view of an arcuate inorganic decorative plate, FIG. 6 is a temperature program for heat treatment, FIG. 7 is a construction state diagram of the arcuate inorganic decorative plate, and FIG. FIG. 9 is a front sectional view of FIG. DESCRIPTION OF SYMBOLS 1 ... Inorganic decorative board, 1a ... Surface, 1 '... Arc-shaped inorganic decorative board, 1a' ... Surface, 2 ... Heat treatment furnace, 3 ... Lower mold, 3a ... Arc surface part, 4 ... Upper die, 4a …… Arc surface

Claims (1)

(57) [Claims] 1. A flat inorganic decorative plate mainly composed of glass cullet whose surface side after firing is polished and finished,
It is placed and set on a lower mold for molding having a concave arc surface, and heated in a heat treatment furnace in this state to soften the inorganic decorative plate and bend along the concave arc surface by its own weight. After that, while further heating the inorganic decorative plate, the decorative plate is pressed from above by a molding upper die having a convex circular surface portion corresponding to the circular arc surface portion of the concave lower die, and a predetermined circular arc is formed. A method of forming an arc-shaped inorganic decorative plate, wherein the decorative plate is formed on a surface.