JPH02208595A - Manufacture of dial for wrist watch - Google Patents

Abstract

PURPOSE:To make it possible to manufacture a dial at a low cost in short delivery time by removing nonconductive film layer on projecting parts such as characters and marks, and electrodepositing a conductive thermosetting paint on a ground metal layer of the exposed dial base. CONSTITUTION:A surface pattern is formed on a dial base 1 by mechanical machining. An applied layer 2 of a nonconductive film is formed thereon. Thereafter, parts which are to become characters, marks and the like are made to protrude with dies. Then, only the protruding parts are cut with a diamond bite and the like, and the layer 2 is removed. The conductive ground metal surface is exposed. An electrodeposited layer 3 is formed with a conductive thermosetting paint such as cation type epoxy resin and acrylic resin. The protruding characters, marks and the like are colored. In this method, the characters, marks and the like on the dial for a wrist watch can be readily colored in a three-dimensional pattern. Even the thin characters can be precisely formed. Design variety can be expanded, and the dial can be formed at a low cost in a short delivery time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a wristwatch dial.

[Summary of the invention]

In the present invention, a surface pattern is formed by machining on the dial base, plating is applied if necessary, and a non-conductive film layer is formed by painting on the surface pattern, and then parts such as letters, abbreviations, marks, etc. are made convex. The convex part of the coating layer is removed by canting with a diamond tool, etc. to expose the conductive base metal layer, and the conductive thermosetting paint is electrodeposited only on this part to form the convex part. This is an attempt to colorize characters, abbreviations, marks, etc.

[Conventional technology]

Conventionally, dials for wristwatches have been made by applying radial openings, vertical grains, etc. to the fabric, plating or painting the cloth, and then planting letters on top. Although this method allows a three-dimensional dial to be obtained, the disadvantage is that the letters are made separately and then implanted on the base, which requires a large number of processing steps and increases costs.

As a method to save the time and effort of embedding letters, a surface pattern is formed by machining on the dial base, the parts that should become letters are raised with a mold, and the letter shapes are created by cutting these raised parts with a diamond cutting tool. Finally, if necessary, there is a method of plating the text to create a dial. (Hereinafter, referred to as the WD method.) However, the finishing of the character portions of the dials produced using the WD method was mainly plating, and many of them were simple.

[Problem to be solved by the invention]

The present invention provides W
The purpose is to expand the variety of designs by easily forming them using the D method and color finishing them, and to obtain them at low cost and in a short delivery time.

[Means to solve the problem]

In the present invention, a surface pattern is formed on the dial base by machining, plating is applied if necessary, and a non-conductive film layer is formed by painting on the surface pattern, and parts such as letters, abbreviations, marks, etc. are raised using the WD method. Then, only the raised parts of the paint layer, such as letters, abbreviations, marks, etc., are removed by canting with a diamond tool, etc., to expose the conductive underlying metal layer, and a conductive thermosetting paint is electrodeposited. A conductive coating layer is formed only on the raised portions, and the raised letters, abbreviations, marks, etc. are colored.

The dial base material is usually brass.

Nickel silver etc. are used.

The resin to be coated is usually a thermosetting resin such as acrylic resin or epoxy resin, which is applied by spray coating or the like and heated to form a coating layer.

As a method for removing the non-conductive paint layer, a cutting method using a cutting tool was used, but other methods may also be used.

The curved portion of the non-conductive paint layer is removed and a conductive thermosetting paint is electrodeposited on the exposed metal surface. In the present invention, cationic epoxy resin, acrylic resin, etc. are used as the paint. did. By mixing fine metal powder into the paint, it is also possible to give the electrodeposition coating layer a metallic luster.

For electrodeposition coating, the dial base is degreased and cleaned, immersed in a solution containing electrodeposition coating liquid, the dial base is used as a cathode, the stainless steel plate is used as an anode, and a direct current of 50 to 150 V is applied between the two electrodes. This is obtained by applying electricity for 1 to 3 minutes, and the electrodeposition paint is applied only to the convex metal surface from which the non-conductive coating layer has been removed.

Next, after cleaning, it is heated and cured to form an electrodeposition coating layer.

[Effect]

Through the above steps, characters, abbreviations, marks, etc. that are three-dimensionally formed on the dial can be easily colored.

[Example 1] The present invention will be explained in detail below with reference to Examples.

FIG. 1 is a cross-sectional view of a wristwatch dial according to Embodiment 1 of the present invention;
FIG. 2 is a cross-sectional view showing each step of the method for manufacturing a wristwatch dial according to Example 1 of the present invention.

(A) The dial base 1 is made of a brass plate with a thickness of 0.3 mm, and the 0 dial base 1 with a radial basis weight is nickel plated and silver plated, then clear coated and painted N2. And so.

(B) The part that should be an abbreviation was made convex by the mold.

(C) Cut the convex abbreviation part from above the coating N2 with a diamond cutting tool, remove the paint layer 2 on the abbreviation part,
The metal surface of the dial base 1 is exposed.

(D) This dial plate is immersed in an electrodeposition coating liquid made of a cationic acrylic electrodeposition coating resin containing a black pigment, and while stirring the electrodeposition coating liquid, the dial plate is used as a cathode, and the stainless steel plate is A direct current of 100 V was applied between the two electrodes for 1 minute using the anode. Next, this dial was heated in a heating oven at 150°C for 20 minutes to harden the electrodeposited coating layer 3.
And so.

I was able to create black abbreviations on the silver dial surface.

As the plating layer on the dial surface, gold, gray, or other colored plating can also be used. The color tone of the electrodeposition coating resin can be white or other colors by changing the pigment.

[Example 2] (^) A radial basis weight was applied to the dial base 1, and nickel plating was applied. A white coating was applied on the plating layer to form coating N2.

(B) The part that should be an abbreviation was made convex by the mold.

(C) The convex abbreviation portion was cut from the top of the coating layer 2 using a diamond cutting tool, the coating N2 on the abbreviation portion was removed, and the metal surface of the dial base 1 was exposed.

(D) This dial plate is immersed in an emulsion type electrodeposition coating liquid in which cationic acrylic electrodeposition coating resin and fine silver powder are dispersed in purified water, and while stirring the electrocoating liquid, the dial plate is was used as a cathode, and a stainless steel plate was used as an anode, and electrodeposited and cured under the same conditions as in Example 1 to obtain an electrodeposited coating layer 3.

I was able to create silver abbreviations on the white dial surface.

The cutting tool for cutting the coating layer 2 can be of various shapes, such as one with a radius.

In addition to the silver plate described in this embodiment, gold, copper, nickel, etc. can be used as the fine metal powder to be mixed in the electrodeposition coating resin.

〔Effect of the invention〕

As described in the embodiments above, according to the present invention, letters, abbreviations, etc. on a wristwatch dial can be easily made three-dimensional and colored. In addition, even thin characters can be precisely formed, expanding the variety of designs, and can be produced in a short delivery time and at low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a watch dial according to the present invention, and FIG.
Figures (A) to ([1]) are cross-sectional views showing each step of the method for manufacturing a wristwatch dial according to the present invention. l...Dial base 2...Paint layer 3...Electrodeposition coating layer and above Applicant Seiko Electronic Industries Co., Ltd. Sho Kosha Co., Ltd.

Claims (1)

[Claims] After forming a non-conductive film layer on the dial base by painting, parts such as letters, abbreviations, marks, etc. are raised using a mold, and only the raised parts of the non-conductive film layer are The conductive base metal layer is exposed by removing it, and then a conductive paint is electrodeposited on the metal surface to form a conductive coating layer only on the raised portions, thereby creating raised letters, abbreviations, A method for manufacturing a wristwatch dial, characterized by colorizing marks, etc.