JPS6018311B2 - Precious stone dial and manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a precious stone dial plate that is of the same quality as conventional precious stone dial plates and can be manufactured at low cost, and a method for manufacturing the same.

．． Conventionally, the method for producing a precious stone dial using natural stone is to form a natural stone 1 into a predetermined size and shape as shown in FIG. Glue the precious stone 2 after shaping and polishing to the top surface of the metal substrate 4 finished to the same dimensions using adhesive 3, and finally add numbers, letters, cut letters, and symbols to the top surface of the precious stone 2. , patterns, etc. 6 were printed and painted to complete the process.

This method requires a long time for processing such as cutting and polishing in order to finish the rough stone to the specified dimensions, and since the precious stone after polishing is less than 30cm thick, there is a risk of it breaking during the post-processing. Yes, it was an extremely troublesome method.

Furthermore, in addition to the above-mentioned method, conventional dials made of natural precious stones easily break if they are hit with something or dropped, so they must be handled with care. SUMMARY OF THE INVENTION The present invention aims to solve the problem of impact resistance that occurs in general precious stone dial plates, and to provide a precious stone dial plate having the same quality as conventional precious stone dial plates, and a method for manufacturing the same.

The precious stone-like dial plate of the present invention is characterized by coating a metal plate with a paste consisting of glass frit, a fire-resistant inorganic pigment, and medium to a thickness of 50A to 20A, and firing it, and polishing the top surface. It has the same quality as the sensitive dial and has the effect of having high impact resistance.

The paste consists of a glass frit, a refractory inorganic pigment, and a medium, and the paste is glassy, mainly composed of glass frit or lead oxide, and melts at a low temperature of 450°C to 50,000°C. Refractory inorganic pigments are metal oxides or salts of metal oxides that become oxides when heated. The medium is preferably one that burns out at a temperature below the melting temperature of the glass frit, and is a mixture of natural or synthetic resin and turpentine oil. still,
Ethylene cellulose is a good viscosity modifier. The thickness of the paste should be as thin as possible in order to be used for watch dials, but
The lower limit is determined to maintain impact resistance, and the upper limit is determined to improve the efficiency of coating work, and the optimum range is 50 to 20.

Next, the method of applying and firing the paste will be explained. First, the paste is applied to a metal substrate to a thickness of 50 to 200 mm by printing, painting, brushing, etc. Then 100
Temporary drying is performed for 15 to 20 minutes at 00 to 150 qo. This temporary drying is to evaporate most of the medium and prevent it from remaining in the glass frit after firing.
This is to prevent the two colors from mixing at the boundary by applying a different color of paste each time the paste is pre-dried when applying two or more colors of paste. Next, firing is performed. Firing is to melt the paste and form a glassy thin film layer on the metal substrate.The firing conditions are as follows: It takes about 30 minutes or more to raise the temperature from 100 pm to 450 pm, and the peak temperature is 470 qo to 50 pm.
Maintain at 0°C for 10 minutes. If carried out under these conditions, the adhesion between the glassy thin film and the metal substrate will be improved, pinballing will be eliminated, and the color development of the refractory inorganic pigment will be perfect. Next, remove the liner after firing. In order to maintain the adhesion between the metal substrate and the glassy thin film, slow cooling is to minimize the shrinkage strain that occurs between the two. Considering labor efficiency, it is best to perform cooling at a cooling rate of 100/min or less. good. Finally, the top surface of the glassy thin film is polished. Abrasives include cerium oxide, chromium oxide, red iron, alumina, and diamond paste. Polisher materials include polyurethane, felt, cast iron, etc. According to the method of the present invention, the adhesion between the metal substrate and the glassy thin film is improved, and therefore, a precious stone-like dial plate with several levels of impact resistance can be manufactured. This is because the paste was temporarily dried to dry most of the medium by evaporation, and the air bubbles that remained within the paste or between the metal substrate and the base were defoamed. This is because the annealing rate was extremely slow to reduce residual strain within the glass. Next, an embodiment of the present invention will be described using FIGS. 2 and 3.

First, a steel rod leg 5 with an outer diameter of 70 mm and a length of 2.00 mm is fixed by spot welding to the back side of a yellow steel plate 4 with a thickness of 30 mm and an outer diameter of 2.8 mm.

Next, pastes 7 and 8 are applied to the upper surface of the yellow steel plate 4 to a thickness of 15 mm by screen printing to form a desired pattern. In this case, since two color pastes 7a and 7b are used, other pastes are applied after temporary drying. The paste mixture is as follows. Glass frit 65%~70%
Medium: 20% Fire-resistant inorganic pigment: 10% to 15% The ingredients of each mixture are as follows.

Glass frit: PP70%, Si0215%, &03
10%, Cd03.5%, others 1.5% (Li2, Zno, AI203) Medium: Turpentine oil, linseed oil, polyvinyl acetate, thinner Black inorganic pigment: Fe203 12% Sb20320
%Zn020% Sn0 28%Coo20% Red inorganic pigment: CdS82%, Ce18% temporary drying is 1
5000 for 20 minutes.

As a result, the bases 7a and 7b are dried and temporarily attached to the upper surface of the copper plate 4. Next, as shown in FIG. 3, baking is performed to melt the pastes 7a and 7b and form a glassy thin film layer 8.

Firing is performed in a continuous firing furnace (compare tunnel furnace), and 1
0000 to 45000 for 3 minutes at peak temperature 4
Maintain 70qC to 500oo for 10 minutes. In addition, it took about 3 seconds for slow cooling to cool down to 500oo~200qC. Finally, the upper surface of the fired thin film layer 8 is polished. Pitch was used as a polyurethane having a hardness of 600 to 900 as a polisher material, and cerium oxide was used as an abrasive. After polishing, washing and drying were performed, numbers, marks, etc. were printed on the upper surface of the thin film layer 8, and after drying at 80 qC for 30 minutes, a precious stone-like dial was completed.

When the dial plate obtained by the above manufacturing method was dropped by 1 m onto plastic tiles laid on a concrete floor, no cracks occurred.

Therefore, it became possible to use a regular dial for the aircraft. In addition, a color tone similar to that of a precious stone dial was obtained. Next, another embodiment of the present invention will be described.

In FIG. 4, in order to make the thin film layer 8 look three-dimensional, the paste 7 is applied on a metal substrate with partially varying thicknesses.

Figure 5 shows the refractory inorganic pigment (metal powder, etc.) 9 of paste 7.
is formed into a relatively large size, which is then temporarily dried and fired together with the paste 7. By polishing the surface of the thin film layer 8, a unique pattern and color can be obtained.

FIG. 6 shows a completed dial plate made according to the present invention with a symbol 6 applied thereto. As described above, the precious stone dial plate and the method for manufacturing the same according to the present invention have a feel comparable to that of a natural precious stone dial plate, have excellent impact resistance, and are of high practical value.

[Brief explanation of drawings]

Figure 1 shows a conventional example, Figures 1 and 2 are perspective views of natural stones, Figure 1 3 is a cross-sectional view of a precious stone dial, Figure 1 4 is a plan view, and Figures 2 and 3 are bookmarks. An embodiment of the invention is shown in FIG.
2 is a sectional view before firing, FIG. 2 is a plan view, FIG. 3 1 is a sectional view after firing, FIG. 3 2 is a plan view, and FIGS. 4 and 5 show other embodiments of the present invention. Fig. 4 1 is a sectional view, Fig. 4 2
is a plan view, Fig. 5 1 is a sectional view, Fig. 5 2 is a plan view, and Fig. 6 is a plan view.
Figures 1 and 2 are dial plates completed according to the present invention;
is a sectional view, and FIG. 62 is a plan view. 1... raw stone, 2... cost stone, 3...
...Adhesive, 4...Metal substrate, 5...
Foot, 6... Symbol, 7, 7a, 7b...
Paste, 8... Thin film layer. Figure 1 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] 1. Glass frit, fire-resistant inorganic pigment,
A precious stone-like dial plate characterized in that a medium paste is applied and fired to a thickness of 50 μm to 200 μm, and the upper surface is polished. 2 Glass frit, fire-resistant inorganic pigment,
A paste consisting of medium was applied to a thickness of 50 μm to 200 μm, and after temporary drying, it was fired at a heating rate of 12°C/min and slowly cooled at a cooling rate of 10°C/min, and the top surface was polished. A method for manufacturing a dial with a precious stone feel, characterized by the following.