JPH04160154A - Production of ornamental member - Google Patents

Abstract

PURPOSE:To inexpensively produce the ornamental member high in decorativeness and with the quality stabilized by masking the surface of an ornamental member of stainless steel, machining the specified part with a laser beam to form a recessed pattern, and then forming a gray-black coating film. CONSTITUTION:A masking film 2 is formed on the surface of an ornamental member 1 of the stainless steel such as SUS 304 by ion plating. Ti, Cr or their compds. with O, C, N, etc., are used for the film 2. A recessed pattern or a character 3 is formed on the specified part of the member 1 by laser beam machining. A gray-black coating film 4 is then formed on the material 1 surface by ion plating. The compd. of Ti with C or N or the compd. of Cr with O, C or N is used for the film 4 in conformity to the film 2. The film 2 is then removed by etching. A gray-black recessed pattern or characteristic 3 is efficiently formed in this way with the quality stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to a method of manufacturing a decorative member using a stainless steel material to form a gray-black concave pattern or letters on the surface of the decorative member.

[Summary of the Invention] The present invention provides a method for forming a concave pattern or letters having a grayish black color on a selective predetermined portion of the surface of a decorative member made of stainless steel material. After applying one of the types of coatings as a masking coating, a concave pattern or letters are formed on selective predetermined portions by laser processing, and then the masking coating is Cr-based grayish black in the case of the D1 series using an ion plating method. One of the coatings, the masking coating is C
In the case of r-type, one type of Ti-based gray-black coating is coated, and then the Ti-based or Cr-based masking film is peeled off and removed by etching to form concave patterns or letters with the desired gray-black color on the surface of the decorative member. To provide a decorative member having high decorative value with stable quality and at low cost.

[Prior art] Conventional methods for forming gray-black concave patterns or letters on the surface of a decorative member made of stainless steel include: - After etching a desired pattern using a photo-etching method, ions are applied to the entire surface of the member. A method in which a gray-black film is coated by a plating method, then the depressions caused by etching are masked with a resist by a printing method, and after removing unnecessary parts of the gray-black film by etching, the resist is peeled off and removed.

■After masking the desired pattern with a resist using a printing method, a corrosion-resistant film such as a gold plating layer is coated, and then etching is performed after the resist is peeled off. After that, a gray-black film is coated on the entire surface of the member by ion plating, a resist is applied to the concave portions by a printing method, and the unnecessary gray-black film is removed by etching. How to remove it.

It has been known.

[Problems to be Solved by the Invention] However, in order to form concave patterns or letters having a grayish-black color only in selective predetermined portions of a decorative member having a generally complex shape and a wide variety of surface finishes, the following drawbacks are encountered. There is.

In method □, when coating the entire surface with photoresist in advance, it is impossible to prevent liquid from pooling due to the complex shape, resulting in variations in film thickness, so a jig for positioning during exposure is required. It is difficult to set the In addition, the resist film is prone to pinholes, and as the pinholes are etched, pinhole correction is required, resulting in poor work efficiency.Furthermore, during the etching process, thin areas of the resist may lift or peel, resulting in poor removal. There are problems such as.

Furthermore, when a pattern is printed by the printing method, printing misalignment occurs, leaving a gray-black film in areas other than the recesses, and conversely, pressure develops in areas where the gray-black film does not remain in the recesses.

In method (2), the printing process is carried out twice, and in the second printing, recesses are formed, so printing misalignment occurs, and a gray-black film remains in areas other than the recesses, and conversely, a gray-black film remains in the recesses. There will be parts that aren't there.

Further, there are problems such as the processing process is complicated and takes a long time, and the efficiency of each operation is low and the cost is high.

The present invention is intended to solve these problems, and its purpose is to form a concave pattern or letters having a gray-black color in a stable and efficient manner, and to create a decorative member with high decorative value. The aim is to provide it at a low price.

[Means for Solving the Problems] In order to solve the above problems, the decorative member of the present invention provides a method for forming concave patterns or letters having a grayish-black color on selectively predetermined portions of the surface of the decorative member made of stainless steel. After coating the surface of the member with one of Ti-based or Cr-based films as a masking film by ion plating, a concave pattern or letters are formed in selective predetermined portions by laser processing, and then ion plating is applied. If the masking film is Ti-based, one of the Cr-based gray-black films is applied by the etching method, and if the masking film is Cr-based, one of the Ti-based gray-black films is applied, and then etching is performed to mask the Ti-based or Cr-based mask. It is characterized by peeling and removing the coating.

[For production]

According to the above method of the present invention, Ti is applied to the entire surface of a decorative member made of stainless steel by ion plating in advance.
By coating with a Cr-based or Cr-based film, a hard film is formed on the entire surface of the member, making it possible to prevent stains and scratches on the surface during the next laser processing process. . In addition, in the coating process of a Ti-based or Cr-based gray-black coating using the ion plating method after laser processing, concave patterns or character parts are generally not formed because the stainless steel base is exposed. Similar to ion plating on stainless steel, it is possible to form a film with good adhesion. On the other hand, by laminating a Cr-based gray-black film on a Ti-based film, or a Ti-based gray-black film on a Cr-based film, the ion plating film can be formed with pinholes in the area other than the interspace. In the former process, the Ti-based film is peeled off through the pinholes in the Cr-based film by etching the Ti-based film, and at the same time, the Cr-based gray-black film in areas other than the recesses is lifted up and easily peeled off. In the latter case, by etching the Cr-based film, the Cr-based film is peeled off through pinholes in the Ti-based film, and at the same time, the Ti-based grayish-black film other than the concave portions is lifted up and can be easily peeled off.

Next, the masking film by ion plating method is
For Ti-based systems, Ti or a compound consisting of Ti and at least one of O, C, and N can be applied; for Cr-based systems, C
A compound consisting of r or Cr and at least one of O, C, and N can be applied, and the film thickness is determined by productivity,
From the viewpoint of adhesion, the optimum thickness is 02 to 15 μm, but there is no problem if the thickness is expanded to 5 μm.

For the gray-black coating formed by the ion plating method, compounds consisting of Ti, C, and N can be applied for Ti-based compounds;
In the system, Cr and 0. A compound consisting of one or two of C and N can be applied, and the optimal coating thickness for both is 0.2 to 1.5 um from the viewpoint of productivity and adhesion, but there is no problem if it extends to 5 um.

To remove the masking film by etching, Ti-based masking films can be removed by immersing them in a mixed solution of hydrochloric acid and nitric acid without damaging the stainless steel substrate and the Cr-based film in the recesses, and Cr-based masking films can be removed using phosphoric acid, sodium carbonate, etc. By using the member as an anode in an aqueous solution and applying a direct current of 1 to IOV, the stainless steel substrate and the Ti-based coating on the recessed portions can be peeled off and removed without damaging them.

Hereinafter, the present invention will be explained based on examples.

[Example 1] FIGS. 1(a) to 1(d) are cross-sectional views of a watch case produced according to the present invention at each manufacturing step.

A watch case 1 made of stainless steel material (SUS304) is installed in a vacuum chamber of an ion plating device, the vacuum chamber is evacuated, and then Ar gas is applied at 10 Pa to the watch case prior to the process of ion blating the watch case.
Ion bombardment was performed with a voltage of 0.5 KV applied to the substrate to clean the surface of the watch case. Next A
After exhausting the r gas and returning the inside of the vacuum chamber to 3×10-”Pa, N2 gas was added as a reactive gas to 6×10-”Pa.
and then set the substrate voltage to 0. IKVEI] was added to generate plasma, and at the same time gold 1): Ti was heated and evaporated using an electron beam heating method, and a gold-colored TiN film 2, which is a compound of Ti and N, was coated to a thickness of 1.0 um. FIG. 1(a) is a cross-sectional view of a watch case formed by the above method. As shown in FIG. 1(b), concave characters are formed in predetermined portions by laser processing at a depth exceeding the thickness of the TiN coating. was marked. For this reason, the surface of the laser-processed character 3 is 5US.
304 material is exposed. In this laser processing, a commercially available Nd/YAG laser device (wavelength 1.06 um,
) under the conditions of an output of 100 W and a pulse width of 10 ms.

Next, as shown in Figure 1(c), the entire surface of the watch case in the state of Figure 1(a) is coated with the same ion plating method as described above, using Cr as an evaporation source and N2 gas, C2H, and gas as reactive gases. A gray-black CrCN layer 4 of 1.0 urr+ was coated.

Next, the watch case in the state shown in Figure 1(c) was soaked in boiling acid.

TiN was immersed in a mixture of nitric acid = 1 = 1 (at room temperature) for about 1 minute.
Coating 2 was removed by etching. At this time, the Cr C'N layer 4 on the TiN film was also lifted up and removed cleanly, and finally the 5US304 layer was removed as shown in FIG. 1(d).
A watch case was obtained in which concave letters with a gray-black appearance were applied to predetermined portions of the watch case using a CrCN compound coating. The stainless steel watch case manufactured using this method has been tested for artificial sweat corrosion resistance (40℃ x 4 degrees 90% x 48 hours).
Artificial seawater (40°C x 90% temperature x 48 hours), bending test (180° bending), thermal shock test (300°
"C x 10 minute heating - rapid cooling in water, repeated 5 times), abrasion resistance test (500g load was applied to the watch case on cowhide, 5
The side of the watch case was rubbed 30,000 times with a cm stroke), and the fFf scratch test (dropped 20 times repeatedly from 1 meter on a vinyl tile). The scratch resistance was sufficiently satisfied.

[Example 2] FIGS. 2(a) to 2(d) are cross-sectional views of a watch case in each manufacturing process according to an example of the present invention.

First, as shown in FIG. 2(a), the entire surface of a watch case made of 5TJS304 was coated with a gold KCr layer 5 of 0.5 am by ion plating.

Next, as shown in Fig. 2(b), a concave pattern 6 is formed on a predetermined part of the watch case by laser processing.Next, as shown in Fig. 2(C), a gray-black color is applied to the entire surface by ion plating. The 0th-order second
The watch case in the state shown in Figure (c) was immersed in a sodium carbonate aqueous solution, and the Cr layer 5 was etched away by passing a 5V DC current through the watch case using the watch case as an anode. At this time, the TiCN layer 7 on the Cr layer 5 was also lifted up and removed at the same time. As a result, the final result is 5US3 as shown in Figure 2(d).
04 A watch case having a gray-black concave pattern appearance was formed at predetermined locations on the surface of the watch case due to TiCN. As a result of the same quality test as in [Example 1], this watch case fully satisfied the corrosion resistance, adhesion, abrasion resistance, and scratch resistance as a watch case.

[Effects of the Invention] As described above, according to the present invention, in the method for manufacturing a decorative member that forms a gray-black concave pattern or letters on the surface of a decorative member made of SUS material, ion plating is applied to the entire surface of the 5LIS material. A Ti-based or Cr-based masking film is formed, arbitrary concave patterns and letters are formed by laser processing, and then a Cr-based gray-black film is applied to the Ti-based masking film, or a Cr-based gray-black film is applied to the Cr-based masking film by ion plating. By laminating a Ti-based gray-black film and peeling off the Ti-based or Cr-based masking film by hot etching, deterioration in appearance quality and cost increase, which were drawbacks of conventional methods, are improved, and the decorative member is It has become possible to form a concave pattern or letters with a desired gray-black color such as a complex shape on the surface, and to provide a decorative member with high decorative value in a stable quality and at a low cost. It can be applied not only to exterior watch parts such as watch dials, hands, and bands, but also to all decorative parts such as eyeglass frames, lighters, tie bins, and jewelry.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views showing each manufacturing process of an embodiment of the exterior part for a timepiece according to the present invention. 1 ・ ・ ・ 5US304 2...TiN layer 3...Laser processed characters 4...CrCN layer 5...Cr layer 6...Laser processed pattern 7...TiCN layer and above Applicant Seiko Epson Corporation

Claims (3)

[Claims] (1) A method for forming concave patterns or letters having a gray-black color on selectively predetermined portions of the surface of a decorative member made of stainless steel, in which a Ti-based or Cr-based coating is applied to the surface of the member by ion plating. After coating one type as a masking film, a concave pattern or letters are formed on selective predetermined parts by laser processing, and then by ion plating, the masking film is one of Ti-based, Cr-based gray-black film, If the masking film is Cr-based, one type of Ti-based gray-black film is applied, and the Ti-based or Cr-based masking film is then peeled off and removed by etching. (2) The Ti-based masking film is Ti or Ti and O,
A compound consisting of at least one of C and N;
2. The method for producing a decorative member according to claim 1, wherein the r-based masking film is Cr or a compound of Cr and at least one of O, C, and N. (3) The Ti-based gray-black film is a compound of Ti, C, and N, and the Cr-based gray-black film is a compound of Cr and one of O, C, and N.
2. The method for producing a decorative member according to claim 1, wherein the method is a compound consisting of one species or two species.