JP2531233B2 - Manufacturing method for precious metal moldings - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a noble metal molded product having a pattern of a plurality of noble metal colors on its surface.

"Prior art" In recent years, the trend of popularization of precious metals has become remarkable, and not only traditional accessories such as rings and necklaces but also those used everyday as precious metals are made, souvenirs and souvenirs. Used in gifts.

By the way, in general, when applying a pattern to the surface of a noble metal three-dimensional molded product, usually during casting, unevenness is made on the inner surface of the mold to reveal an uneven pattern, or after molding, unevenness is marked by engraving. It has a pattern. Further, it is also practiced to apply a coloring agent to the recess thus formed or to use plating.

[Problems to be Solved by the Invention] However, in the case of applying the above-described conventional technique to a noble metal molded body, in the case of attaching an uneven pattern,
Since there is no change in color tone, it is difficult to distinguish pictures and patterns and the decorative effect is small. In addition, the method of applying a coloring agent to the surface of a precious metal or using plating has a drawback in that these are easily peeled off and lack in durability, and it is difficult to produce an elegant color tone.

"Means for Solving the Problems" In order to solve the above problems, the production method of the present invention is a laser on the surface of a laminated plate formed by layering a plurality of noble metals or alloys of noble metals having different color tones. A patterning step of irradiating a beam to partially expose the inner layer and a forming step of forming the laminated plate are included.

In the manufacture of laminated plates, a large number of materials are relatively inexpensively manufactured by stacking a plurality of types of materials, diffusion-bonding them, and rolling them.

Marking by irradiation with a laser beam may be performed by moving the irradiation position of the laser beam. Therefore, by combining with an appropriate image processing device and moving device, for example,
It can be easily done based on the data entered in the form of drawings.

For forming, bending, press forming, deep drawing and other appropriate methods are adopted.

Either the patterning process or the molding process may be performed first.

When the marked precious metal laminated plate is sandwiched between two transparent thermoplastic resin or thermosetting resin plates and integrally molded, a three-dimensional molded product having a precious metal color tone can be obtained in addition to a plate-shaped decorative plate.

[Operation] In such a method for producing a precious metal molded body, a part of the surface layer of the laminate is scraped off by irradiation with a laser beam to form a recess on the surface, and the precious metal of the inner layer is formed on the bottom surface of the recess. It is exposed, so that a pattern with a different color tone from the surface precious metal appears. The color tone of the pattern can be made different by changing the irradiation time and intensity of the laser beam and changing the exposed layer. According to laser marking, high-mix low-volume production can be performed inexpensively, easily, and quickly.

When the portion with the pattern is not largely deformed during molding, marking can be performed in the state of the plate in advance, and for those with large deformation such as deep drawing, the pattern is not deformed when marking after molding.

When the resin is coated after marking and molded, the resin exhibits a brilliant shine and a three-dimensional pattern peculiar to the precious metal, and also protects the precious metal portion. In this case, since the amount of the noble metal may be small, it is possible to obtain a molded article that is relatively inexpensive and has decorativeness and durability.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As a noble metal plate material, Pt plate 1 (Pt: 9 mm) with dimensions of width: 50 mm × length: 60 mm × thickness: 0.5 mm as shown in Fig. 1
9.99wt%) and a pure gold plate 2 (Au: 99.99wt%) of the same size,
18 gold plate 3 with the same width and length and a thickness of 40.0 mm (Au: 75wt
%, Ag: 12.5 wt%, Cu: 12.5 wt%), degreasing them, stacking them in the order of Pt, pure gold, 18 gold, charging them into a diffusion welding machine, degassing and ascending. Laminated body 4 by applying heat and pressure
(See FIG. 2). Subsequently, hot rolling and cold rolling were repeated by the roll 5 to obtain a noble metal laminated plate 6 having a thickness of 2.0 mm (see FIG. 3).

The noble metal laminated plate 6 has a Pt white color on one side and an 18 gold color on the other side. This laminated plate 6 is cut into a circular shape having an appropriate size, and the surface on the Pt side is irradiated with a laser beam from a YAG (yttrium-aluminum-garnet) laser generator 7 to mark a pattern 8 on the surface (see FIG. 4). ).
Marking with a laser beam is performed by exposing the second layer 2a of pure gold or by changing the intensity of the marking, or by using the 18th gold third layer.
The color tone can be changed depending on whether the layer 3a is exposed (see FIG. 5). Although a three-layer structure is used in this example, a complex color tone can be obtained by providing any number of metal layers of the same type or of other types. Alternatively, the Pt layer can be scraped off with a laser beam to obtain a wide gold-colored portion.

The precious metal laminated plate 6 marked with this pattern 8 was press-molded, unnecessary portions were removed, and the corners were smoothly finished to form an ashtray 9 (see FIG. 6).

FIG. 7 shows a second embodiment of the present invention, in which the laminated plate 6 is cut into a rectangular shape, a laser beam is applied to the laminated plate 6 to give a pattern 8, and then bending is applied to form a tubular shape. Both ends were fused. The laminated plate 6 cut into a disc shape was fused to one end of this cylindrical body to form a bottom portion, and a cup 10 was manufactured.

FIG. 8 shows a third embodiment of the present invention. After the laminated plate 6 is formed into a cup shape by an appropriate method, a laser beam is applied to this to mark a pattern (character) 8a and a trophy 11 is formed. Is manufactured.

FIGS. 9 and 10 show a fourth embodiment of the present invention, in which a laminated plate 6 rolled to a thickness of 0.2 mm is cut to a diameter of 170 mm, and a pattern 8 is formed by a laser beam, and then the same size. Clamp between two resin plates 12 made of transparent acrylic with a thickness of 3 mm 1
It was heated to 80 ° C. and hot-pressed to obtain a composite body 13 (see FIG. 9). This composite 13 is heated to 140 ° C. in an electric heating furnace and pressure-molded to make a brush stand with a diameter of 60 mm and a height of 100 mm.
Was produced (see FIG. 10). The formed brush stand 14 was buffed to eliminate surface roughness. This brush stand 14
The surface is white, and the pattern is three-dimensionally expressed on the surface by the layered colors of pure gold and 18 gold, and it retains the gracefulness in terms of decoration, and has commercial value and property value.
And because the surface is covered with resin and wear and corrosion of precious metals are prevented, it can be used as daily necessities,
Since the precious metal can be seen through the resin, most of it looks like it is made of precious metal, giving a luxurious feeling for the cost.

"Effects of the Invention" As described in detail above, the present invention partially irradiates the inner layer by irradiating a laser beam on the surface of a laminated plate formed by laminating plural kinds of precious metals or alloys of precious metals having different color tones. Since the process and the process of forming the laminated plate are included, it is possible to attach an elegant pattern with a contrast of different color tones on the surface of the noble metal molded product, which greatly enhances the decorative effect of the molded product. Can be increased to Also,
Since a laser beam is used, patterns, letters, symbols, etc. of patterns can be easily marked, suitable for high-mix low-volume production, and convenient as souvenirs and gifts.

Further, by marking the laminated plate of the noble metal with a laser beam, coating it with a resin, and integrally molding it, it is possible to obtain a molded product that is highly decorative and durable, inexpensive, and useful.

[Brief description of drawings]

FIGS. 1 to 6 show an embodiment of the present invention. FIG. 1 is a view showing a process of stacking material plates, FIG. 2 is a view of diffusion bonding of the stacked plates, and FIG. The rolling figure,
FIG. 4 is a diagram for irradiating a laser beam, FIG. 5 is a partially enlarged view of the same, FIG. 6 is a product diagram, FIG. 7 is a diagram of a second embodiment of the present invention, and FIG. FIG. 9 is a diagram of the third embodiment, FIG. 9 is a diagram showing a manufacturing process of the fourth embodiment, and FIG. 10 is a fourth diagram.
It is a figure of an example. 6 ... Laminated plate, 7 ... Laser generator, 12 ... Resin.

Claims (2)

(57) [Claims] 1. A step of irradiating a laser beam on a surface of a laminated plate formed by laminating a plurality of kinds of precious metals or alloys of precious metals having different color tones so as to partially expose an inner layer, and forming the laminated plate. A method for producing a precious metal molded body, which comprises the step of applying. 2. A step of irradiating a laser beam on a surface of a laminated plate formed by laminating a plurality of kinds of precious metals or alloys of precious metals having different color tones so as to partially expose an inner layer, and coating the laminated plate with a resin. And a step of subjecting the laminated plate coated with the resin to a forming process.