JPH0743476A - Dial for timekeeper and its manufacture method - Google Patents

Abstract

PURPOSE:To obtain a dial for a timekeeper which has metal touch and three- dimentional feeling in low cost by forming a plating layer and a painted layer on a dial board on which letters and patterns having irregularity, a board body and a support leg are integrally molded of metal. CONSTITUTION:Die-cast casting mold on which letters and patterns 2 having irregularity, a support leg 2, a board body 7 on the periphery, and a guide pin 8 and a gate part 9 of an inlet on the upper face are arranged is made. Next, a cast mold is set on a die casting machine so that it may be held at 220 deg.C, high tensile brass alloy is melted at 930 deg.C and die casting is performed. And finishing punch of a dial complete shape is performed through the guide pin 8 and the rib part 7 is separated and a dial 1 is obtained. In addition, after surface activation and delustering, a plating layer 4 such as nickel plating on the stratum and silver plating on the upper face is formed and a painted layer is produced in spray painting. Finally, an ornament plating layer 6 such as gold plating and rhodium plating is formed and the dial for a timekeeper of a silver color system which has three-dimensional feeling and metal touch is produced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece dial and its manufacturing method.

[0002]

2. Description of the Related Art As one of the conventional methods for manufacturing a timepiece dial, as shown in FIG. 4 (a), a timepiece which is a separate member at a predetermined position on the back surface of a flat dial plate substrate 1 made of brass or the like. -The fulcrum 2 for fixing the bment is welded or brazed and the surface is polished to give radiation, a streak pattern, etc., and a plated layer 4 of nickel, silver or the like,
Is provided, and a coating layer 5 is formed directly on the coating layer 5 by spray coating using white enamel or the like to print the character pattern 3, and there are two printed dials. In the same manner as in the prior art 1, the supporting plate 2 is fixed to the back surface of the dial substrate 1 which has been subjected to the perforating process for planting characters in advance, and the same plating layer 4 and the coating layer 5 are formed. Then, there was a typesetting dial plate for fixing the character, the pattern 3, which is a separate member, through the hole.

As for the three, as shown in Japanese Patent Publication No. 1-257157 and Japanese Patent Publication No. 58-48687, 51-134660, the back and forth of a dial for a watch in which irregularities such as characters and patterns are raised by electroforming are predetermined. Cut to size and fix support on the back side as in the case of the prior arts 1 and 2, plating is applied and a clear racker is applied, the upper surface of the convex portion is cut and polished, the substrate is exposed, and the conductive portion is exposed. There was an electroformed dial with decorative plating such as gold.

[0004]

However, in the prior art 1, the step of attaching a separate member for fixing the movement is required, and in the case of welding, a convex mark is generated on the surface and this is caused by a grindstone. Since it requires a step of scraping and polishing and the characters and patterns are formed only by printing, there is a problem that the metallic feeling and the three-dimensional feeling are poor although the cost is relatively low.

The prior art 2 requires the steps of attaching the fulcrum and removing the convex marks on the surface as in the prior art 1, and has a three-dimensional feeling and a metallic feeling and is rich in design variety. There is a problem that it is not possible to use it for low-priced products because the cost is high and it is necessary to join letters and patterns that are separate members from processing.

In the prior art 3, the forming time is long due to the electroforming process, and the cost is high because the back surface cutting is required to correct the forming accuracy, and the supporting member which is a separate member is fixed by welding. There was a problem that the fixing force was unstable.

Therefore, the present invention is to solve the above problems, and an object of the present invention is to provide at low cost a three-dimensional timepiece dial having a metallic feeling.

[0008]

According to the dial construction for a timepiece of the present invention, a plating layer and a coating film are laminated on a dial board in which uneven characters, patterns, a board body and a foot are integrally formed of metal. It is characterized in that the uneven portion is formed and is selectively constituted by a decorative plating layer.

Further, in this manufacturing method, when the letters and patterns having irregularities, the substrate body and the supporting legs are integrally formed of metal, a rib portion is provided on the outer periphery of the dial board, and the rib portion has an outer shape finish. A step of integrally forming with a metal by a die casting method using a casting die having a positioning guide pin for punching, a step of finishing punching a dial shape through the guide pin, and further liquid honing or etching. The process of activating the surface by applying a plating layer to form a coating layer directly on the surface and the process of cutting or polishing a part of the letter or pattern having the above-mentioned unevenness to expose the dial plate substrate surface and form a conductive portion. Finally, a decorative plating layer is applied to the conductive portion, and the timepiece dial and the metal for the manufacturing method thereof are a copper alloy, a zinc alloy, and an aluminum alloy.

[0010]

According to the present invention, the letters and patterns having irregularities on the substrate of the timepiece dial, the substrate body, and the supporting legs are easily integrally formed by the die casting method, so that they are different members from the conventional method. There is no need to fix the supporting legs and letters, there is no concern about the fixing strength, and since the dial plate shape is finished after die casting by casting, deburring work at the time of casting is not necessary, and it is also possible to select uneven parts On the other hand, since the cutting or polishing is polished and decoratively plated, it has an excellent metallic and three-dimensional effect, and has a high decorativeness.

[0011]

【Example】

[Embodiment 1] Hereinafter, embodiments of the present invention will be described with reference to FIGS.
Will be described more specifically.

FIG. 1A is a completed plan view of a timepiece dial according to the present invention.

FIG. 1 (b) is a sectional view taken along the line A ... A'showing the uneven portion of FIG. 1 (a).

FIG. 2A is a plan view in the manufacturing process of the timepiece dial according to the present invention.

FIG. 2 (b) is a sectional view taken along the line A ... A'showing the uneven portion of FIG. 2 (a). FIG. 3 shows a manufacturing process of the timepiece dial according to the invention, and is a cross-sectional view taken along the line A ... A'showing the concavo-convex portion of FIG.

A completed plan view of the timepiece dial shown in FIG. 1, characters having irregularities of 0.2 to 0.6 mm corresponding to a sectional view, a pattern 3 (multiaxial circle) supporting leg 2, a substrate body, and As shown in FIG. 2, in order to make a casting die in which a rib portion 7 is provided on the outer periphery of the dial plate, positioning guide pins 8 for finishing the dial plate and a gate portion 9 of the casting port at the time of casting are arranged on the upper surface. , NC to engrave a copper-tungsten alloy to create an electrode for electric discharge machining, and then use this electrode to transfer to a die casting mold material (tungsten-molybdenum alloy) by electric discharge machining to form a die casting mold. .

Next, the casting mold is set in a die casting machine so as to maintain it at 220 ° C., and 93 parts of a high strength brass alloy for casting (HBsCIn3) specified in JIS H2205 are set.
The casting of the dial blank shown in FIG. 2 is formed by melting and die casting at 0 ° C., and the finished dial plate as shown in FIG. 1A is finished through the positioning guide pins 8 arranged on the upper surface of the rib portion 7. A dial plate having a hardness of HV (500 g) 170 in which characters, patterns 3 (multiaxial circle) supporting legs 2 and a substrate body are integrated as shown in FIG. Substrate 1 was obtained.

Further, as shown in FIG. 3 (b), for surface activation and matting, liquid honing using silica powder or immersion in 5% ammonium persulfate solution for etching is used for etching. 1 μm and a silver plating of 0.05 μm on the upper surface to form a plating layer 4, and then, as shown in FIG.
As in (c), add 10μ of acrylic clear racker.
The coating layer 5 is formed by m-spray coating.

Next, as shown in FIG. 3 (d), the convex portion is fixed on a lapping machine with a PVA grindstone GC # 3000, rotated and ground to expose the base material, and the polishing pad is further exposed to loose abrasive grains (oxide zirconium oxide). (1 μm) is wet-bonded to form a polished and glossy conductive part, and finally, nickel plating of 0.5 μm is applied as shown in FIG. 3 (e), and then 0.05 to 0 of gold, rhodium plating or the like is applied. The decorative plating layer 6 was formed to a thickness of 0.2 μm.

In this embodiment, a timepiece dial having a three-dimensional appearance and a silvery metallic appearance was obtained.

[Embodiment 2] A die casting mold corresponding to the plan view and sectional view of FIG. 2 was prepared in the same manner as in Embodiment 1, and the die was set on a die casting machine so as to hold and print at 160 ° C. A zinc alloy ingot 1 type (zinc-aluminum system) for die casting specified in H2201 is melted at 420 ° C. and die cast to form the dial blank casting of FIG. 2 and placed on the upper surface of the rib portion 7. The dial plate substrate 1 as shown in FIG. 3A was obtained by finishing the dial plate as shown in FIG. 1A through the positioning guide pins 8.

Next, as shown in FIG. 3 (b), liquid honing using silica powder for surface activation and matting is performed, and after pretreatment, strike copper plating is performed in a cyan bath and pyrophosphoric acid is formed on the upper surface. Apply 3 μm of copper plating and 1 μm of nickel plating by bath, and 0.2 μm of black nickel directly above it.
Then, the plating layer 4 is formed, and then, as shown in FIG. 3C, a coating film 5 is formed by spray-coating acrylic metallic blue with a thickness of 10 μm.

Next, as shown in FIG. 3 (d), the dial board is set in a dedicated jig, rotated by a lathe and cut by a diamond tool to expose the base material to form a conductive portion, and finally, as shown in FIG. As shown in (e), strike copper plating in a cyan bath was performed, and nickel plating of 0.5 .mu.m was applied to the base, and then gold 0.
A 2 μm decorative plating layer 6 was formed.

In the present embodiment, a blue-type metallic timepiece dial having a three-dimensional appearance and a metallic appearance was obtained.

As described above, in the first embodiment, the metal of the dial plate substrate is a copper alloy, and in the second embodiment, the zinc alloy is used, but the same effect can be obtained by using an aluminum alloy.

The basic quality characteristics (weather resistance, moisture resistance, heat resistance, adhesion, sulfidation resistance) of the timepiece dial of the present invention were evaluated, but the same quality as the prior art was obtained, and the features of the present invention Tables 1 and 2 show the results of comparing the foot fixing strength in the integral molding of the supporting foot as in Example 1 with that in Example 1 and the conventional welding connection.

[0027]

[Table 1]

[0028]

[Table 2]

Table 1 shows the results of the shear test, and JIS K
6580 as a reference foot (foot diameter φ0.65 mm,
(Pulse 1.5 mm) with push jig
The tensile shear strength in the transverse direction is shown with a line.

Table 2 shows the results of the foot bending test. A lateral force was applied to the fulcrum of the dial to determine the load and the amount of fulcrum change.

As a result of the above, the strength was high and excellent as compared with the conventional welded joint.

[0032]

As described above, according to the present invention, a plating layer and a coating film are laminated on a dial plate substrate in which uneven characters, patterns, a substrate body, and supporting legs are integrally formed of metal. It is characterized in that the concavo-convex portion is selectively constituted by a decorative plating layer.

Further, in this manufacturing method, when the letters and patterns having irregularities, the substrate body, and the supporting legs are integrally formed of metal, a rib portion is provided on the outer periphery of the dial board, and the rib portion has an outer shape finish. A step of integrally molding with a metal by a die casting method using a casting die having positioning guide pins for punching, then a step of finishing punching a dial plate shape through the guide pins, and further by honing or etching. The process of activating the surface and applying a plating layer to form a coating layer directly on the surface, and the process of cutting and polishing a part of the letters and patterns having the above-mentioned unevenness to expose the dial plate substrate surface and form a conducting part and the last Is characterized in that a decorative plating layer is applied to the conducting portion. The timepiece dial and the metal of the manufacturing method thereof are a copper alloy, a zinc alloy, and an aluminum alloy. It has the following effects from it.

1. Since the letters, patterns, substrate body, and supporting legs are integrally formed, it is not necessary to attach a separate member and the bonding strength is higher than other manufacturing methods.

2. It is not necessary to remove the convex traces on the surface that occur when joining the fulcrum by welding.

3. Since it is integrally formed by the die-casting method, it is easy to form high unevenness as compared with other manufacturing methods, and the productivity is extremely high.

4. Since the dial is finished after die casting, it is not necessary to deburr the gate portion of the casting port.

5. Since the main body of the dial plate is made of metal and a plating layer and a coating film are laminated on the upper surface of the main body, and a part of it is selectively made up of decorative plating, the metallic feeling and the decorative effect are enhanced.

As described above, the effect of the present invention is extremely large.

[Brief description of drawings]

FIG. 1A is a completed plan view of a timepiece dial according to the invention, and FIG. 1B is a completed sectional view taken along the section line A ... A ′ of FIG.

FIG. 2 (a) is a plan view showing a method for manufacturing a timepiece dial according to the invention, and FIG. 2 (b) is a process sectional view taken along the line A ... A ′ in (a).

FIG. 3 is a process cross-sectional view taken along the line A ... A ′ in FIG. 1 (a) showing the manufacturing method of the present invention. (A) is a dial plate substrate forming step, rib portion cutting step (b) is a plating layer forming step (c) is a coating layer forming step (d) is cutting and polishing step (e) is a decorative plating step

FIG. 4 is a completed sectional view of a conventional timepiece dial. (A) Sectional view of a conventional timepiece dial (b) Sectional view of another conventional timepiece dial

[Explanation of symbols]

 1 dial board 2 support 3 letters, pattern 4 plating layer 5 coating layer 6 decorative plating layer 7 rib portion 8 positioning guide pin 9 gate portion

Claims (3)

[Claims] 1. A plating layer and a coating film are laminated on a dial plate substrate in which uneven characters, patterns, a substrate body, and supporting legs are integrally formed of metal, and a part of the uneven portion is selectively formed. A dial for a watch, characterized in that it is composed of a decorative plating layer. 2. In a method of manufacturing a timepiece dial in which uneven characters, patterns, a substrate body, and supporting legs are integrally formed of metal, a rib portion is provided on the outer periphery of the finished dial plate, and the rib portion is provided on the rib portion. A step of integrally forming with a metal by a die casting method using a casting die provided with a positioning guide pin for external shape finish cutting, a step of subsequently performing a dial plate shape finish cutting through the guide pin, and a liquid ho A step of activating or plating the surface by plating or etching to form a coating layer and forming a coating film directly on the surface and characters having the above-mentioned unevenness,
A method of manufacturing a timepiece dial, comprising a step of cutting or polishing a part of a pattern to expose a dial plate substrate surface to form a conductive portion, and finally a decorative plating layer is applied to the conductive portion. 3. A timepiece dial and a method for producing the same, wherein the metal of claim 1 or 2 is a copper alloy, a zinc alloy, or an aluminum alloy.