JP5451865B1 - Method for producing semi-finished product for jewelry and method for producing jewelry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jewelery semi-finished product and a jewelery semi-finished product manufacturing method capable of producing a high-quality and stable quality jewelery semi-finished product and jewelery.
A heating / pressurizing step of high-frequency induction heating while pressing a plurality of base materials 3 and a plurality of brazing materials 4 alternately stacked in a stacking direction by a pressurizing plate 53, A semi-finished product for jewelry, in which the base material 3 is joined in the stacking direction by a plurality of brazing materials 4.
[Selection] Figure 4

Description

  The present invention relates to a method for producing a semifinished product for jewelry for producing jewelry such as a ring or a pendant, and a method for producing a jewelry using this semifinished product for jewelry.

  Conventionally, as a ring in which a pattern is formed or engraved on an outer peripheral surface by combining noble metals having different color tones, Patent Document 1, Patent Document 2, Patent Document 3, and the like are disclosed. This type of ring is made by forming a plurality of precious metals of different colors in a seamless ring shape, polymerizing the precious metal rings to each other and fixing them together, and forming the ring into a thin wall by work hardening by expansion molding. After laminating and joining metal plate materials of different colors called gold, twisting, etc., the surface is carved with a chisel or a drill-like tool, and then forged with a hammer. Some have a grid pattern on the surface.

  In addition, conventionally, a method is also used in which a plurality of noble metal rings and brazing materials are alternately laminated and heated to join the laminated noble metal rings to each other with a brazing material.

Japanese Utility Model Publication No. 61-148432 JP 2009-196299 A Japanese Patent No. 4642153

  However, in the conventional method, in order to join the laminated noble metal rings, the thickness of the brazing material for joining must be increased to some extent, and the portion of the brazing material becomes conspicuous from the outside due to the thickness of the joint after joining. There was a thing. In particular, due to the difference in color between the noble metal ring and the brazing material, there is a problem that the brazing material is conspicuous. On the contrary, if the thickness of the brazing material for joining is reduced, the laminated noble metal rings may not be joined well, and the strength may be lowered. In addition, when the amount of brazing material used is large, there is a problem in that the precious metal ratio in the entire product is low, and the quality of the product is lowered.

  The present invention has been made in order to solve the above-mentioned problems, and has a high quality and stable quality semifinished product for jewelry, and a method for producing a semifinished product for jewelry capable of efficiently producing jewelry. And it aims at provision of the manufacturing method of jewelry.

A method for manufacturing a semifinished product for jewelry according to the present invention is made to solve the above-mentioned problems. A plurality of precious metal base materials and a plurality of brazing materials, which are alternately stacked, are added in a stacking direction by a pressure plate. A heating / pressurizing step in which high-frequency induction heating is performed by a heating coil while pressing, and the plurality of base materials are joined in the stacking direction by the plurality of brazing materials by the heating / pressurizing step , and the base material and the brazing material are The heating and pressurizing step heats and pressurizes the base material and the brazing material in an inert gas atmosphere, and the heating coil includes the base material and the base material. It arrange | positions so that the circumference | surroundings of the radial direction of a brazing material may be enclosed, and the thickness of the said brazing material is 0.01 mm-0.1 mm before a heating and pressurization .

  According to such a configuration, the thickness of the brazing material between the base materials is reduced in the heating and pressurizing process by applying high frequency induction heating while pressing the plurality of stacked base materials and the plurality of brazing materials. Can do. In addition, even when a brazing material having a small thickness is used, the base materials can be firmly bonded to each other. Thereby, after manufacturing the semifinished product for jewelry, the presence of the brazing material does not stand out in appearance, and a high-quality product can be manufactured. In particular, in jewelry such as a ring, the beauty in appearance is important, and thus thinning the brazing material after production is very important in improving the beauty in appearance. In this respect, the manufacturing method according to the present invention is particularly effective in improving the beauty in appearance because the brazing material can be thinned as described above. In addition, the amount of brazing material in the entire product can be reduced, and the proportion of the base metal portion of the noble metal can be increased, so that deterioration in product quality can be prevented. Moreover, it can prevent that a pinhole arises in the semifinished product for jewelry. In addition, by heating the laminate (base material and brazing material) by high frequency induction, the temperature can be increased in a short time, and the temperature can be decreased in a short time after the heating is completed. Thereby, the semifinished product for jewelry can be manufactured efficiently. As described above, according to the present invention, a high-quality and stable quality semifinished product for jewelry can be efficiently manufactured.

Moreover, it is preferable that the manufacturing method of the jewelry which concerns on this invention is equipped with the process step which processes the semifinished product for jewelry manufactured by said manufacturing method of the semifinished product for jewelry into said predetermined shape.
In the method for manufacturing a jewelry product, the processing step includes pressing a semi-finished product for jewelry into a corrugated shape, and cutting an upper end and a lower end of the corrugated jewelry semi-finished product. And a cutting step for flattening.

  According to the method for manufacturing a semifinished product for jewelery and the method for manufacturing a jewelery of the present invention, it is possible to efficiently manufacture a semifinished product and jewelery of high quality and stable quality.

It is a perspective view of the semi-finished product for jewelry concerning one embodiment of the present invention. It is a perspective view of jewelry (finger ring) concerning one embodiment of the present invention. (A) Perspective view of base metal ingot and (b) Perspective view of brazing metal ingot. It is a perspective view for demonstrating the manufacturing method of the semi-finished product for jewelry. It is a perspective view of a laminated body. It is a perspective view of a heating and pressurizing device. It is a perspective view which shows the inside of a heating and pressurizing apparatus. It is a perspective view which shows the inside of a heating and pressurizing apparatus. It is a figure explaining the manufacturing method of a ring. It is a figure explaining the manufacturing method of a ring. It is a figure explaining the manufacturing method of a ring. It is a photograph of the jewelry manufactured by the Example. It is a photograph of the jewelry manufactured by the comparative example.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. First, the semifinished product for jewelry and jewelry will be described. Although it does not specifically limit as jewelry, for example, a ring, a pendant, etc. can be mentioned, In this embodiment, it demonstrates using a ring as jewelry. FIG. 1 is a perspective view of a semifinished product for jewelry according to an embodiment of the present invention, and FIG. 2 is a perspective view of a jewelry (ring) according to an embodiment of the present invention.

  As shown in FIG. 1, the semifinished product 1 for jewelry includes a plurality of precious metal base materials 3 and a plurality of ring-shaped brazing materials 4, and the base materials 3 and the brazing materials 4 are alternately laminated. The plurality of base materials 3 are joined together by a brazing material 4 disposed therebetween. Moreover, the semifinished product 1 for jewelry has the opening 11 in the center part, and has the lamination pattern by the some base material 3 in an internal peripheral surface and an outer peripheral surface. Each base material 3 is formed in a ring shape having an opening in the center, and the outer shape thereof is not particularly limited, but can be formed into a shape such as a circle, an ellipse, a polygon, a heart shape in plan view, In this embodiment, it is formed in a circular washer shape (washer shape). Moreover, although the material of the base material 3 is not specifically limited, For example, noble metals, such as white gold, yellow gold, pink gold, silver, platinum, palladium, can be used. Each base material 3 is formed in a plate shape whose upper and lower surfaces are flat, and the thickness of each base material 3 is not particularly limited, but considering the size of the ring 2 to be manufactured. For example, 1.00 mm to 2.00 mm is preferable. Further, the outer diameter and inner diameter of the base material 3 are not particularly limited, but considering the size of the ring 2 to be manufactured, for example, the outer diameter is preferably 15 mm to 30 mm, and the inner diameter is preferably 10 mm to 20 mm. . The base material 3 is formed by punching a base metal 30 described later into a ring shape.

  The brazing material 4 can join metals by melting by heating and solidification by cooling. Examples thereof include gold brazing, platinum brazing, silver brazing, and copper brazing. The brazing material 4 is formed in a plate shape whose upper and lower surfaces are flat, and the thickness thereof is preferably 0.01 mm to 0.1 mm before the jewelery semifinished product 1 is manufactured, and the jewelery semifinished product 1 is manufactured. Thereafter, 0.01 mm to 0.05 mm is preferable. Each brazing material 4 is formed in a ring shape having an opening in the center like the base material 3 and its outer shape is not particularly limited, but for example, circular, elliptical, polygonal, heart-shaped, etc. in plan view In this embodiment, it is formed in a circular washer shape (washer shape). Further, the outer diameter and inner diameter of the brazing material 4 are not particularly limited, but the outer diameter is preferably 15 mm to 30 mm, and the inner diameter is preferably 10 mm to 20 mm, as with the base material 3 described above. Further, the brazing material 4 is formed by punching a brazing material ingot 40 described later into a ring shape.

  Moreover, the ring 2 is formed by processing said jewelry semi-finished product 1, and as shown in FIG. 2, the laminated pattern is formed in the side surface by the base material 3 from which said color tone differs. This laminated pattern may be formed in a straight line by a processing method, or may be formed so as to wave. The ring 2 has an opening 21 at the center due to the opening of the base material 3.

  Next, a method of manufacturing the semifinished product for jewelry 1 and the ring 2 as described above will be described. First, the manufacturing method of the semifinished product 1 for jewelry is demonstrated. When producing the semifinished product 1 for jewelry, first, as shown in FIG. 3A, a plate-shaped base metal 30 is prepared, and the base metal 30 is used using a mold (not shown). The base material 3 is formed by punching into a ring shape. The material and plate thickness of the base metal 30 are the same as the material and plate thickness of the base material 3 described above. Further, a base metal 30 made of a different material is prepared, and the base material 3 is formed using a mold (not shown) in the same manner as described above. Further, by repeating this operation, a plurality of base materials 3 having different materials are formed (base material forming step). A plurality of base materials 3 may be formed at a time using a plurality of molds (not shown). In the present embodiment, a plurality of base materials 3 are formed using a base metal 30 for yellow gold (YG) and pink gold (PG).

  Similarly to the base material 3, as shown in FIG. 3B, a plate-like brazing metal ingot 40 is prepared, and the brazing metal ingot 40 is ring-shaped using a mold (not shown). The brazing material 4 is formed by punching. The material and plate thickness of the brazing metal 40 are the same as those of the brazing material 4 described above. Further, a plurality of brazing materials 4 are formed by repeating this operation (brazing material forming step). A plurality of brazing materials 4 may be formed at a time using a plurality of molds (not shown). In the present embodiment, a plurality of brazing materials 4 are formed using a brazing metal ingot 40 of silver brazing.

  Next, as shown in FIG. 4, a plurality of base materials 3 and a plurality of ring-shaped brazing materials 4 are alternately laminated (lamination step). At this time, in this embodiment, the base materials 3 of different materials are alternately stacked. For example, yellow gold (YG) base material 3-wax material 4-pink gold (PG) base material 3-wax material 4-yellow gold (YG) base material 3-wax material 4-pink gold (PG) Like the base materials 3..., The base materials 3 of different materials are alternately stacked. In the present embodiment, five yellow gold base materials 3, five pink gold base materials 3, and nine brazing materials 4 are laminated therebetween. As a result, as shown in FIG. 5, a laminated body 10 in which a plurality of base materials 3 and a plurality of brazing materials 4 are alternately laminated is formed, and the brazing material 4 is interposed between the base materials 3 adjacent to each other in the laminating direction. It becomes a sandwiched configuration.

Next, high-frequency induction heating is performed while the laminate 10 is pressurized by the heating / pressurizing device 50 (heating / pressurizing step). Here, the heating / pressurizing device 50 will be described. FIG. 6 is a perspective view of the heating / pressurizing device, and FIGS. 7 and 8 are perspective views showing the inside of the heating / pressurizing device. As shown in FIGS. 6, 7, and 8, the heating / pressurizing device 50 includes a main body case 51, a support base 54 disposed in the main body case 51, and a position above the support base 54 in the main body case 51. A heating coil 52 disposed and a pressure plate 53 disposed above the heating coil 52 in the main body case 51 are provided, and the object to be heated can be high-frequency induction heated by the heating coil 52 in the main body case 51. It is a device that can. The high frequency induction heating is a heating method in which a high frequency is used to generate heat by passing a current through an object according to the principle of electromagnetic induction, and a frequency of about 3 kHz to 300 MHz can be used. The main body case 51 is connected to an inert gas supply source (not shown), and is configured to be supplied with an inert gas. While increasing the atmospheric pressure, the air in the main body case 51 can be replaced. Although it does not specifically limit as an inert gas, For example, nitrogen, argon, etc. are mentioned, The oxidation of the to-be-heated material in the main body case 51 can be prevented with this inert gas. Further, the inside of the main body case 51 is sealed during heating. The support base 54 in the main body case 51 is made of carbon or metal and is disposed so that the upper surface is horizontal, and an object to be heated can be disposed on the upper surface. The heating coil 52 is disposed so as to surround the object to be heated, is connected to a high frequency power source (not shown), and can generate a high frequency at a predetermined frequency to heat the object to be heated by high frequency induction. . The shape of the heating coil 52 is not particularly limited, but is preferably a ring shape from the viewpoint of heating the ring-shaped object to be heated. Further, the pressure plate 53 is made of carbon or metal, and is arranged so that the lower surface thereof is horizontal, and is configured to move up and down by a driving means (not shown). An object to be heated is sandwiched between the lower surface and the upper surface of the support base 54, and the object to be heated is pressed from above and below. Although it does not specifically limit as a drive means (not shown), For example, an electric motor, a hydraulic pump, an air compressor etc. can be used. In the heating / pressurizing step, the laminated body 10 is disposed inside the heating / pressurizing device 50, and the inert gas is supplied in a state where the inside of the device is sealed, so that the air in the main body case 51 is made inert gas. With an inert gas atmosphere. Further, by driving and lowering the pressure plate 53, the stacked body 10 is sandwiched between the pressure plate 53 and the support base 54, and the stacked body 10 is pressed in the stacking direction (vertical direction). Further, the laminate 10 is heated by high-frequency induction heating by energizing the heating coil 52. Although it does not specifically limit as heating and pressurizing conditions, For example, 600 to 1700 degreeC is preferable as heating temperature, and 700 to 900 degreeC is more preferable. The applied pressure is preferably 5 to 10 kg . The heating / pressurizing time is preferably 5 seconds or more. Through the heating and pressurizing steps described above, the plurality of base materials 3 in the laminated body 10 are joined via the brazing material 4, and the jewelry semi-finished product 1 is manufactured.

  Moreover, after the heating and pressurizing process, the semifinished product 1 for jewelry is cooled (cooling process). As this cooling process, methods, such as natural cooling, air cooling, and water cooling, can be used, for example.

  Next, the manufacturing method of the ring 2 is demonstrated. When the ring 2 is manufactured, the jewelry semi-finished product 1 manufactured above is processed into a predetermined shape according to the design of the ring 2. More specifically, for example, as shown in FIG. 9, the outer surface of the jewelry semi-finished product 1 is cut into a predetermined shape using a cutting tool 60 that is a cutting tool (FIGS. 9A and 9B). . Similarly, the jewelry semi-finished product 1 is fixed to a lathe, and the inner surface of the jewelry semi-finished product 1 is cut into a predetermined shape by a cutting tool 60 (FIG. 9C). At this time, it is preferable to cut the jewelry semi-finished product 1 into a predetermined outer shape and inner shape by computer numerical control (CNC). Thereafter, the semifinished product for jewelry 1 having a predetermined outer shape and inner shape is subjected to polishing treatment, surface treatment, and laser engraving (FIG. 9D). Thus, the ring 2 can be manufactured by processing the semifinished product 1 for jewelry (processing process).

According to the manufacturing method of the semifinished product 1 and the ring 2 for jewelry as described above, the heating / pressurizing step is performed by heating the plurality of base materials 3 and the plurality of brazing members 4 that are laminated while applying high frequency induction heating. The thickness of the brazing material 4 between the base materials 3 can be reduced. That is, the brazing material 4 spreads uniformly by capillarity between the upper and lower adjacent base materials 3 by pressurization, and the molten brazing material 4 is pushed out to the outside of the laminate 10. The thickness of 4 becomes thinner. As a result, the brazing material 4 between the base materials 3 is joined with a very small amount of the brazing material 4, and the brazing material 4 becomes inconspicuous (not visible). Therefore, a decrease in quality can be prevented by reducing the amount of brazing material 4. Moreover, even if the brazing material 4 having a small thickness is used, the base materials 3 can be firmly joined. Thereby, after manufacturing the semifinished product 1 for jewelry and the ring 2, the presence of the brazing material 4 does not stand out in appearance, and a high-quality product can be manufactured. In particular, in a jewelry using a noble metal such as a ring, the beauty in appearance is important. Therefore, thinning the brazing material 4 after production is very important in improving the beauty in appearance. In this respect, the manufacturing method according to the present invention is particularly effective in improving the beauty of the appearance because the brazing material 4 can be thinned as described above.
Further, since the amount of the brazing material 4 in the entire product can be reduced and the proportion of the precious metal base material 3 portion can be increased, it is possible to prevent the quality of the product from being lowered. Moreover, it can prevent that a pinhole generate | occur | produces in the semifinished product 1 for jewelry. In addition, by heating the laminate 10 (the base material 3 and the brazing material 4) by high frequency induction heating, the temperature can be increased in a short time, and the temperature can be decreased in a short time after the heating is finished. Thereby, the semifinished product 1 for jewelry can be manufactured efficiently. As described above, according to the present invention, it is possible to efficiently manufacture a semi-finished product 1 and a ring 2 for jewelry with high quality and stable quality. Moreover, the reproducibility of the laminated pattern on the product side surface can be enhanced by forming the base material 3 using a mold. Moreover, by forming the base material 3 from the base metal 30, the base metal can be used effectively and the loss of material can be reduced.

  In the above manufacturing method, an inert gas is supplied in the heating / pressurizing step, and the base material 3 and the brazing material 4 are heated and pressurized in an inert gas atmosphere. Thereby, while being able to prevent the base material 3 from being oxidized, the several base material 3 can be joined favorably and the semi-finished product 1 for jewelry and the ring 2 of higher quality can be manufactured.

  As mentioned above, although one Embodiment of this invention was described, the specific aspect of this invention is not limited to the said embodiment. For example, in the above embodiment, the base materials 3 having different materials are alternately stacked. However, the present invention is not limited to this configuration, and the base materials 3 having the same material may be stacked. Even with such a configuration, the stacked base materials 3 can be bonded to each other by pressurization and high-frequency induction heating.

  Moreover, the specific method for processing the jewelry semi-finished product 1 and manufacturing the ring 2 is not limited to the said embodiment. For example, as shown in FIG. 10, the jewelery semi-finished product 1 is pressed into a corrugated shape by pressing it with a corrugated mold 61 (press steps: FIGS. 10A and 10B). Thereby, the lamination | stacking pattern of the side surface by the some base material 3 becomes a waveform. Moreover, the upper end and lower end of the corrugated jewelry semi-finished product 1 are cut to make the jewelry semi-finished product 1 flat (cutting step: FIG. 10B). Subsequently, the side surface of the semifinished product 1 for jewelry is cut with a cutting tool 62 that is a cutting tool, so that the semifinished product 1 for jewelry is made into a round shape (FIG. 10C). As the cutting tool 62, a diamond cutting tool including diamond can be used. Thereafter, the inner surface of the jewelry semi-finished product 1 is cut into a predetermined shape (FIG. 10 (d)), and then the jewelry semi-finished product 1 is subjected to polishing treatment, surface treatment and laser engraving. Thus, the ring 2 can be manufactured by processing the jewelry semi-finished product 1 (processing step) (FIG. 10E). 10, the same components as those in FIG. 9 are denoted by the same reference numerals, and the description thereof is omitted. According to such a configuration, when the semifinished product 1 for jewelery is made into a corrugated shape, the portion of the brazing material 4 is inconspicuous so that a corrugated layered pattern by the base material 3 appears clearly. A semi-finished product manufacturing method is particularly effective. In addition, since the mold 61 is pressed and molded, the reproducibility of the waveform pattern is enhanced.

  Alternatively, as shown in FIG. 11, after the jewelery semifinished product 1 is flattened, a ring-shaped metal 70 is fitted on the outer side of the jewelery semifinished product 1 and both are brazed (FIG. 11 (c). )). The material of the ring-shaped metal 70 is not particularly limited, but, for example, platinum, silver, gold, or the like can be used. Subsequently, the side surface of the ring-shaped metal 70 is cut into a round shape by using a cutting tool 61 that is a cutting tool (FIG. 11 (d)), and then the inner surface of the jewelry semi-finished product 1 is formed into a predetermined shape. Cutting is performed (FIG. 11E). Further, the semifinished product for jewelry 1 and the metal 70 are subjected to polishing treatment, surface treatment and laser engraving. Thus, the ring 2 can be manufactured by processing the jewelry semi-finished product 1 (processing step) (FIG. 11 (f)). In FIG. 11, the same components as those in FIG. 10 are denoted by the same reference numerals and description thereof is omitted.

Moreover, although the said embodiment demonstrated using a ring as jewelry, the kind of jewelry is not limited to this, For example, it can also be set as a pendant etc.

Moreover, in the said embodiment, although the ring-shaped base material 3 and the brazing material 4 which have an opening in the center part were used, the shape of the base material 3 and the brazing material 4 is not limited to this. For example, a base material 3 and a brazing material 4 that are rectangular in plan view and do not have an opening may be used. In this case, after manufacturing the semifinished product for jewelry, an opening can be formed in the central portion by cutting the central portion of the semifinished product for jewelry. Moreover, it can also process into a various shape according to the kind of target jewelry, without forming opening in the manufactured semifinished product for jewelry.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to this embodiment. As an example, a jewelry (a ring) was manufactured by the above-described method for manufacturing a semifinished product for jewelry according to the present invention and the method for manufacturing a jewelry. At this time, jewelry (ring) was manufactured using five yellow gold (YG) base materials 3, five pink gold (PG) base materials 3, and nine silver brazing filler metals 4.
Moreover, as a comparative example, jewelry (a ring) was manufactured by a conventional manufacturing method.

  FIG. 12 is a photograph of the jewelry (ring) manufactured according to the example, and FIG. 13 is a photograph of the jewelry (ring) manufactured according to the comparative example. As shown in FIG.12 and FIG.13, compared with a comparative example, in Example, the part of the brazing material 4 in the manufactured jewelry (ring) can be made thin, and the brazing material 4 can be made inconspicuous. (The brazing material 4 between the upper and lower base materials 3 is hardly visible in FIG. 12, and the brazing material 4 is visible in FIG. 13). Therefore, it was confirmed that high-quality and stable jewelery could be obtained.

DESCRIPTION OF SYMBOLS 1 Semi-finished product for jewelry 2 Ring 3 Base material 4 Brazing material 10 Laminated body 30 Base metal for base metal 40 Ingot for brazing material 50 Heating / pressurizing device 51 Main body case 52 Heating coil 53 Pressure plate 54 Support stand

Claims (3)

A heating / pressurizing step is provided, in which a plurality of noble metal base materials and a plurality of brazing materials alternately stacked are heated in a high frequency induction manner by a heating coil while being pressed in a stacking direction by a pressure plate,
A method of manufacturing a semifinished product for jewelry, wherein the plurality of base materials are joined in the stacking direction by the plurality of brazing materials by the heating / pressurizing step ,
The base material and the brazing material are formed in a ring shape having an opening in the center,
The heating / pressurizing step heats and pressurizes the base material and the brazing material in an inert gas atmosphere,
The heating coil is arranged so as to surround the circumference of the base material and the brazing material in the radial direction,
The method for producing a semifinished product for jewelry, wherein the brazing material has a thickness of 0.01 mm to 0.1 mm before heating and pressing . A method for manufacturing a jewelry, comprising a processing step of processing the semifinished product for jewelry manufactured by the method for manufacturing a semifinished product for jewelry according to claim 1 into a predetermined shape. The processing step includes a pressing step for pressing the jewelry semi-finished product into a corrugated shape, and a cutting step for cutting the upper end and the lower end of the corrugated jewelry semi-finished product into a flat shape. The method for manufacturing a jewelry according to claim 2 .