JP5172373B2 - Decorative metal article manufacturing method and decorative metal article - Google Patents

Description

  The present invention relates to a method for manufacturing a decorative metal article and a decorative metal article that can be easily processed and can be mass-produced, and that a decorative object such as jewelry can be seen more beautifully as compared with a conventional burying method.

Conventionally, as a method of fastening various kinds of jewelry to a molded article of a plastic composition containing a noble metal powder, Patent Document 1 or the like that attaches a decorative object such as a jewelry to the surface of a molded article of a plastic composition before drying is attached. It was known how to fix the described embedding method.
That is, the method of Patent Document 1 is fired after a decorative object made of a material having a melting point higher than that of the noble metal powder is embedded and embedded on the surface of a molded object molded into a predetermined shape while the plastic composition is soft. Is the method.
Further, by drilling a hole in the surface of the molded article of the plastic composition after drying, placing a decoration in the hole and firing the plastic composition, the precious metal powder is sintered and the hole shrinks. There is also a method of fixing the decorative object.
Japanese Patent No. 2694782

However, in these methods described above, since the decorative object is embedded in the molded article of the plastic composition, since the embedded decorative object can only be seen on the surface, the overall appearance is poor. It was. In addition, since the back side of the decorative object is embedded in the molded article of the plastic composition, light scattering (diffuse reflection) is sufficient particularly in the case where the decorative object is a jewelry having translucency (transparency). It was something that could not be demonstrated.
Moreover, when modeling a ring-shaped thing such as a ring that occupies a representative position as a molded article of the above-described plastic composition, conventionally, a plastic composition is formed in a string shape, and it is entangled with a stick to form a ring. The skill was required and the production took time.

  Therefore, the present invention solves the above problems, the processing method is simple and mass production is possible, and a method for producing a decorative metal article in which a decorative object looks more beautiful as compared with a conventional embedding method and The purpose is to propose decorative metal articles.

The present invention has been proposed in view of the above, and the conventional embedding method has a poor appearance of the decorative object, while the decorative object is sandwiched between the plate-like plates, thereby causing the above-described problem. In the case of jewelry that has been eliminated, the shape and cut of the ornament can be seen well and looks beautiful, and the ornament is especially translucent (transparency), the light penetrates from the side and the back side, so the diffuse reflection of light The present invention has been found by recognizing that the decoration is significantly higher, the ornament looks more beautiful, and is suitable for mass production.
The first invention of the present invention forms a plate by forming a plastic composition containing at least one powder selected from silver, gold, platinum, copper and alloys thereof and an organic binder into a plate shape. A plate forming step, a bonding step in which at least one decorative object is sandwiched between the end portions of at least two plates, and at least a portion of the plates other than between the end portions is bonded; and the bonding step The manufacturing method of the decorative metal article characterized by including the composition drying process which dries the modeling thing which passed through, and the composition baking process which bakes the modeling thing which passed through the said composition drying process.
The ornament used in the first invention is not particularly limited in its material and shape as long as it has resistance to heat during firing (it does not cause softening, melting, deformation, discoloration, etc.).

According to a second aspect of the present invention, a plate is formed by forming a plastic composition containing at least one powder selected from silver, gold, platinum, copper and alloys thereof and an organic binder into a plate shape. A plate forming step, a bonding step of bonding at least a portion of the plate other than between the ends in a state where at least one mounting frame is sandwiched between the ends of at least two plates, and the bonding A composition drying process for drying a shaped article that has undergone the matching process, a composition firing process for firing the shaped article that has undergone the composition drying process, and a decoration for attaching a decorative object to a mounting frame fixed to the shaped article. The manufacturing method of the decorative metal article characterized by including an object attachment process.
The ornament used in the second invention may be the ornament in the first invention, and does not have heat resistance during firing (causes softening, melting, deformation, discoloration, etc.). Can also be used.

3rd invention of this invention contains the 1 or more types of powder selected from silver, gold | metal | money, platinum, copper, and these alloys, and an organic binder in the said bonding process in said 1st, 2nd invention. The present invention relates to a method for producing a decorative metal article, wherein the plates are bonded together with a paste-like composition or simply water.
In the third aspect of the invention, it is desirable to make the bonding between the plates more reliable, and it is desirable to have a close contact.

The fourth invention of the present invention includes a through-hole forming step of forming a hole penetrating in the thickness direction in the plate before the composition baking step in the first to third inventions. The present invention relates to a method for manufacturing a metal article.
In the fourth aspect of the invention, for example, a through hole is formed in the production of a ring or the like. For example, the through hole forming step may be performed before the bonding step, or the bonding may be performed. It may be performed between the step and the composition drying step, or may be performed after the composition drying step.

According to a fifth aspect of the present invention, the plastic composition in the first to fourth aspects of the present invention contains silver powder or silver alloy powder, and a liquid for sulfiding silver after the composition firing step is used as a decoration or mounting frame. The present invention relates to a method for manufacturing a decorative metal article, which is applied to the inside of a plate with a tool sandwiched therebetween.
In the fifth invention, when the plastic composition contains silver powder or silver alloy powder, black silver sulfide may be intentionally formed and used for design contrast.

A sixth invention of the present invention is characterized in that a plurality of plates are branched from a base portion, and an ornament attached to an ornament or an attachment frame is sandwiched between end portions of the plates. The present invention relates to a decorative metal article.
Since the sixth invention has the above-mentioned excellent shape characteristics, especially in jewelry having translucency (transparency), the light is irregularly reflected from the side and the back side, so that the decoration is more beautiful. Is what you see.

The method for producing a decorative metal article according to the first aspect of the present invention uses a plastic composition containing at least one powder selected from silver, gold, platinum, copper and alloys thereof from a base part. A decorative metal article in which a plurality of plates are branched and a decorative object is sandwiched between end portions of the plates can be easily produced. Since the ornament is held between the plates and there are many portions that are not in contact with the plates, that is, exposed portions, the form and cut of the ornament can be seen well and look beautiful. In particular, when the ornament is a jewelry having translucency (transparency), light can be taken in from the side and the back side, so that the irregular reflection of light is extremely high, and the ornament and the entire decoration metal article Will look more beautiful.
In addition, this method basically includes a step of forming a plate by forming a plastic composition into a plate shape, and a step of bonding them together, so that it is an extremely simple operation, and mass production can be extremely easily performed. Applicable to various product embodiments.

  The method for producing a decorative metal article according to the second invention of the present invention is such that the mounting frame is sandwiched in place of the decorative object in the first invention, and the decorative object is attached to the mounting frame after firing. It can be used even if it does not have resistance to heat (causes softening, melting, deformation, discoloration, etc.), and it is suitable when, for example, natural jewelry is used as a decoration.

  In 3rd invention of this invention, the said paste-form composition becomes an adhesive agent, and the bonding between plates more reliably becomes a contact | adherence state. Further, when water is used, the plate absorbs water and softens, so that in this case as well, the bonding becomes more reliable.

  The fourth invention of the present invention is a method of forming a through-hole in the production of a ring such as a ring, for example, and forming a ring by forming a conventional plastic composition in a string shape and tying it with a rod or the like. In comparison, a ring can be formed very easily, and mass production is also possible.

  In the fifth aspect of the present invention, when the plastic composition contains silver powder or silver alloy powder, black silver sulfide can be intentionally formed and used for design contrast.

  In the sixth aspect of the present invention, since there are many portions that are not in contact with the decorative plate, that is, exposed portions, the shape and cut of the decorative item can be seen well, and the appearance is very good. In the case of jewelry having transparency, light is diffusely reflected from the side and the back side, so that the decoration and the entire decoration metal article can be seen more beautifully.

  First, a plastic composition, a decorative article, and a mounting frame that are raw materials used in the present invention will be described.

(Plastic composition)
The plastic composition in the present invention contains at least one powder selected from silver (Ag), gold (Au), platinum (Pt), copper (Cu), and alloys thereof, and an organic binder. The powder and the organic binder will be described in detail below, but various plastic compositions are already on the market and may be used.

  The powder is not particularly limited, but is preferably a particle having an average particle size of 20 μm or less, a maximum of about 60.0 μm, and a minimum of about 0.3 μm. A manufacturing method such as atomized powder or reduced powder is particularly specified. However, it is preferred that the particles have a nearly spherical shape.

  The organic binder is not particularly limited, but cellulose binders such as methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carmellose (carboxymethylcellulose), alginic binders such as sodium alginate, starch Polysaccharide binders such as wheat flour, British gum, xanthan gum, dextrin, dextran and pullulan, animal binders such as gelatin, vinyl binders such as polyvinyl alcohol and polyvinylpyrrolidone, acrylics such as polyacrylic acid and polyacrylate Binder, polyethylene oxide, polypropylene oxide, other resin binders such as polyethylene glycol, etc. Preferably selected and used more binders. In the cellulose binder, it is most preferable to use a water-soluble cellulose binder.

Further, if necessary, the following substances may be added to the organic binder as additives. That is, as an additive, organic acids (oleic acid, stearic acid, phthalic acid, palmitic acid, sepacic acid, acetylcitric acid, hydroxybenzoic acid, lauric acid, myristic acid, caproic acid, enanthic acid, butyric acid, capric acid), Organic acid esters such as phthalic acid-n-dioctyl and phthalic acid-n-dibutyl (having methyl group, ethyl group, propyl group, butyl group, octyl group, hexyl group, dimethyl group, diethyl group, isopropyl group, isobutyl group Organic acid ester), higher alcohol (octanol, nonanol, decanol), polyhydric alcohol (glycerin, arabit, sorbitan, diglycerin, isoprene glycol, 1,3 butylene glycol), ether (dioctyl ether, didecyl ether), phenyl Propane skeleton And lignin, which is a network polymer formed by condensing the structural unit, and one or a mixture of two or more selected from the group consisting of liquid paraffin and oil (for example, olive oil rich in oleic acid) . These additives are added for the purpose of improving plasticity or for the purpose of preventing the plastic composition from adhering to the hand during modeling. Furthermore, the above additives, lignin and glycerin, provide appropriate water retention.
Furthermore, surfactants such as anionic, cationic and nonionic are listed as additives. The surfactant has an effect of improving the mixing property between the metal powder and the binder and an effect of improving water retention.

Among the organic binders, the water-soluble cellulose binder serves to impart plasticity. Of the organic binders, polyethylene oxide has a function of improving the adhesion in a liquid state by giving a high viscosity at a low concentration. Moreover, although sodium alginate gives moderate water retention like the said glycerol, it contributes also to the contact | adherence improvement effect | action. Furthermore, the polyacrylic acid ester and the polyacrylic acid serve to strengthen the adhesiveness.
As the organic binder, it is preferable to use 0.02 to 3.0 wt% of starch and 0.02 to 3.0 wt% of a water-soluble cellulose binder in terms of solid content excluding water. Among them, the water-soluble cellulose binder serves to impart plasticity as described above, while starch serves to increase the dry strength when the plastic composition is dried. However, when only starch is used as the organic binder, fabric cracks are likely to occur during coating. Therefore, these problems can be solved by using a water-soluble cellulose binder together. As described above, this starch contains 0.02 to 3.0 wt% in terms of solid content excluding water in the plastic composition, but if less than 0.02 wt%, it leads to insufficient strength during drying. Further, if it exceeds 3.0 wt%, a fabric crack is likely to occur during coating, and the shrinkage rate increases. On the other hand, as described above, the water-soluble cellulose binder also contains 0.02 to 3.0 wt% in terms of solid content excluding water. If it is less than 0.02 wt%, the effect of imparting plasticity is sufficient. However, if it exceeds 3.0 wt%, the shrinkage rate increases. As such a water-soluble cellulose-based binder, methyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, or the like is used, which is used after being dissolved in water.

As the amount of the organic binder in the plastic composition using the starch and the water-soluble cellulosic binder as the organic binder, a more preferable mode is that the total amount of the organic binder is 0.00 on the solids display excluding water. It is desirable to be within the range of 1 to 4 wt%. In this case, when the amount of the organic binder is less than 0.1 wt%, it is difficult to obtain a homogeneous plastic composition. In addition, there is a disadvantage that the strength after coating and drying is weakened. When the amount of the organic binder exceeds 4 wt%, the shrinkage rate increases and cracks are likely to occur. Therefore, the amount of the organic binder is desirably 0.1 to 4 wt%.
When polyethylene oxide is used, it is desirable that polyethylene oxide having a molecular weight of 100,000 to several million is in the range of 0.1 to 3 wt%.
Moreover, when using surfactant, it is desirable to exist in the range of 0.03 to 3 wt%, and when using fats and oils, it is desirable to be within the range of 0.1 to 3 wt%.

Water should be added in the required amount. If it is too small, it becomes hard and difficult to form, and if it is too much, the shape cannot be maintained. This plastic composition can be prepared in the form of clay, paste or slurry depending on the water content.
Moreover, you may add Bi, Se, Sb, In, Sn, Zn powder, or those alloy powders as a sintering promoter.
Furthermore, you may add the metal compound powder or glass powder chosen from lead carbonate, lithium carbonate, zinc oxide, phosphoric acid, sodium carbonate, vanadium oxide, sodium silicate, phosphate etc. as an adhesive improvement agent.

  A composition containing 75 to 99 wt% of the powder, 0.1 to 4 wt% of the organic binder, and the balance water is suitable for the addition ratio of each component in the plastic composition. In addition, when the ratio of the powder is high within the above range, it has a clay-like behavior, but when the ratio of the powder is low, the viscosity becomes low and the slurry or paste-like behavior is obtained.

  In the preferred composition, the powder is 75 to 99 wt%. However, if the amount is too small, the shrinkage becomes large and the sintering is disturbed. If the amount is too large, the proportion of the organic binder and water increases accordingly. , Causing trouble in modeling.

[Decoration]
In the first aspect of the present invention, the decorative object in the present invention is one that has resistance to heat during firing (which does not cause softening, melting, deformation, discoloration, etc.), and is itself a decorative property as a decorative article. Those having design properties are preferably used. For example, white zircon, blue sapphire, blue spinel, ruby, green spinel, rose de france, pink ruby, garnet, aquamarine, kunzite, topaz, alexandrite, champagne, amethyst, etc. are used as synthetic stones. be able to. In addition to the synthetic stones described above, various shapes of decorative porcelain molded bodies, ceramic molded bodies such as ceramic molded bodies, and heat-resistant metal molded bodies may be used, and non-geometric shapes such as heat-resistant mineral raw stones and power stones may be used. You may have.
Further, the ornament in the second invention is not limited to the above-mentioned heat resistance, and the material (material) may be the ornament used in the first invention. Then, emerald etc. may be sufficient, and natural stones, such as malachite, Turkey, amber, magnesite, onyx, pearl, may be sufficient.
In the first invention, although there is a limitation on the heat resistance of the decorative object, since the frame for mounting is not used as in the second invention, an advantage that a non-geometric shape can also be used. There is.

[Mounting frame]
The mounting frame in the present invention is used in the second invention, and silver (Ag), gold (Au), platinum (Pt), copper (Cu), or any of these present in the plastic composition. A material having a melting point lower than that of a powder such as an alloy may be used as long as it has at least resistance to heat during firing (no softening or deformation). This mounting frame has a configuration for attaching an ornament after firing, for example, a plurality of locking claws.
As the mounting frame, cast products corresponding to various sizes are already on the market, and they may be used.

  Next, each process (a plate formation process, a bonding process, a composition drying process, a composition baking process) which comprises the manufacturing method of the decoration metal article of 1st invention of this invention is demonstrated.

[Plate forming process]
A plate is prepared by forming the plastic composition into a plate shape.
The size, thickness, shape, etc. of the plate are not particularly limited. In consideration of mass productivity, it is desirable to form a rectangular flat plate having a uniform thickness (about 0.5 to 5 mm) as used in the examples described later. There is also a design-design visual effect that looks as if a metal article is formed by stacking a plurality of metal steel plates. In addition, it is desirable to prevent the drying of mass-produced plates such as double wrapping.
Further, for example, a plate having a non-uniform thickness may be used. Further, for example, the planar shape may be a polygonal shape, a circular shape, or the like, and is not limited to a flat plate shape, but may be a continuous square wave shape or a continuous round wave shape, or a plate formed into a rectangular flat plate as described above is subjected to secondary processing. You may make it give such a shape.

[Lamination process]
In a state where at least one decorative object is sandwiched between the end portions of at least two plates obtained in the plate forming step, at least a part of the plates other than the end portions is bonded.
The interval between the end portions of the plate may be an end portion corresponding to one side of the plate formed in a rectangular shape, or may be an end portion corresponding to two sides, three sides, or four sides without being limited to one side. A decorative object is sandwiched between the ends of the plate, and lightly applied from both sides of the decorative object to fix (pressure contact).
At the time of bonding, a paste-like composition or water containing at least one kind of powder selected from silver, gold, platinum, copper and alloys thereof and an organic binder as in the third invention is added to the plate. You may make it apply | coat between and bond together. That is, since the plate is not dried at this stage, it may be easily adhered by pressure contact, but depending on the working conditions such as temperature and humidity, the plate surface may be dried and difficult to adhere. Even in such a case, by using the paste-like composition, the paste-like composition becomes an adhesive, and bonding between the plates is more surely brought into close contact. Further, when water is used, the plate absorbs water and softens, so that in this case as well, the bonding becomes more reliable.
In the bonding step according to the first aspect of the invention, since the decoration itself is sandwiched, any shape of decoration can be used, for example, a non-geometric shape as described above can be used.

[Composition drying step]
The shaped article that has undergone the bonding step is dried.
Drying may be performed at room temperature, or may be dried by warming with warm air from a dryer. Or when performing the composition baking process mentioned later in heating furnaces, such as an electric furnace, you may make it dry in the vicinity of a heating furnace.
In addition, after drying, it is applied between the plate edge portions of the part where the paste-like composition is bonded, and is dried again, so that the plate edge portion that appeared to be a laminated shape does not look like a laminated shape, that is, a plate It becomes a modeled object in which the end edge portion appears to be integrated. Moreover, also in the inner edge part of the through-hole mentioned later, the said paste-form composition is apply | coated after drying, and it dries again, and it becomes a molded article in which the inner edge part of the through-hole which looked laminated is seen integrally.

[Composition firing step]
The shaped article that has undergone the composition drying step is fired.
Firing is not particularly limited, but using a heating furnace such as an electric furnace or a gas furnace, a temperature range lower than the melting point (mp) of the powder used in the plastic composition by 350 ° C. [(mp−350 ° C.) It is desirable to heat at ~ mp] for 5 to 90 minutes.

Moreover, each process which comprises the manufacturing method of the decoration metal article of 2nd invention of this invention inserts at least 1 frame for attachment instead of inserting an ornament between the edge parts of a plate in a bonding process. And, it is almost the same as each step in the first invention except that the ornament attachment step shown below is performed.
[Decoration process]
A decoration is attached to an attachment frame fixed to a shaped article (sintered article) that has undergone the composition baking step.
As described above, various sizes of cast products having a plurality of locking claws are commercially available. When using this, the locking claws are bent using a tool such as a Yatsuko. And fix the decoration.

[Through hole forming process]
In the fourth aspect of the invention, a hole penetrating in the thickness direction is formed in the plate.
If this through-hole formation process is before the said composition baking process, it will not specifically limit the time which implements it, Even before the said bonding process, the said bonding process and the said composition drying process Or after the composition drying step. Although not particularly limited, for example, in the production of a ring (ring) or the like, a through hole may be formed for each plate as in the examples described later, or after the bonding step. You may make it form a through-hole in series.
Furthermore, when forming a through hole for each plate, if a plate formwork that can also form a through hole is used, a plate with through holes can be mass-produced very easily.

[Silver sulfide film formation process]
In the fifth aspect of the invention, after the composition baking step, a liquid for sulfiding silver is applied to the inside of the plate sandwiching a decorative object or a mounting frame.
As the liquid for sulfiding silver, various products are already on the market as “smoldering liquid”, and any liquid may be used as long as it contains a sulfur ion (S ²⁻ ) for sulfiding silver. 5 g, 67.5 g of quicklime, 0.12 g of casein and 0.15 g of potassium sulfide are heated and dissolved in 729.73 g of water, and the specific gravity at room temperature is concentrated to about 30 degrees Baume and filtered. When silver is sulfided, black silver sulfide (Ag ₂ S) is formed. During this treatment, it is preferable to appropriately heat the inside of the plate after the composition baking step in a dryer or the like.
In addition, as long as the respective steps are not hindered, any processing or processing such as processing for improving design properties may be performed.

A decorative metal article in which a plurality of plates are branched from a base portion according to the sixth invention of the present invention, and a decorative object or a decorative object attached to an attachment frame is sandwiched between end portions of the plate, It is not limited to the decorative metal article obtained by the method of the first to fifth inventions.
Further, the decorative metal article according to the sixth aspect of the present invention is not limited to the examples described below, and there are various modes. For example, the direction in which the plurality of plates are branched from the base portion may be on both sides of the base portion. It may be a decorative metal article in which a plurality of plates are branched in four directions around the base.

[Silver powder]
A silver mixed powder composed of 50% by weight of silver powder having an average particle diameter of 2.5 μm and 50% by weight of silver powder having an average particle diameter of 20 μm was used.
[Organic binder]
As the organic binder A, an aqueous solution in which 10.4 g of methyl cellulose, 7.8 g of starch, and 81.8 g of water were mixed was used.
As the organic binder B, an aqueous solution in which 6.0 g of methyl cellulose, 4.5 g of starch, and 89.5 g of water were mixed was used.

[Silver plastic composition]
The silver powder 92% by weight and the organic binder A 8% by weight were added and mixed well to obtain a silver plastic composition. This silver plastic composition is in the form of a clay, and is shaped into a desired design with a hand, a spatula, or a mold.
[Silver paste composition]
The silver powder 85% by weight and the organic binder B 15% by weight were added and mixed well to obtain a silver paste composition. This silver paste composition is applied to the plate with a brush and the plates are bonded together, or by applying between the plate edge portions of the bonded part with a brush, The part is made in a state where it cannot be seen in a laminated form.

[Decoration]
"Synthetic opal" (diameter 3mm, round cut shape) made by Signature Japan Co., Ltd. "Synthetic emerald" (diameter 3mm, round cut shape) made by Signature Japan Co., Ltd. [Mounting frame]
Product name "Stone frame round cut" (diameter 3mm) manufactured by Aida Chemical Industry Co., Ltd.
202.5 g of sulfur, 67.5 g of quicklime, 0.12 g of casein and 0.15 g of potassium sulfide were dissolved by heating in 729.73 g of water, and the specific gravity at room temperature was concentrated to about 30 degrees Baume and filtered.

《Circle cutter production》
A copper plate having a thickness of 0.1 mm and a width of 40 mm is cut to a length of 60 mm.
A copper plate is wound around a vinyl chloride pipe having a diameter of 18 mm and a length of 40 mm, and the copper plate is fixed with vinyl tape.
In addition, the Example mentioned later is a case where it finishes to JCS15, Comprising: JCS is a Japan custom ring size (Japan Custom Size), and means the conventional customary Japanese size. There is a JIS standard that can be rewritten, but the JIS standard is rarely used in Japan.

[Example 1]
In a wrap film in which 20 g of the silver plastic composition was doubled, it was thoroughly squeezed, and the air contained in the silver plastic composition was extracted.
Next, the silver plastic composition which was thoroughly swollen and evacuated was placed on a cooking sheet, and cardboard having a thickness of 1 mm was placed on both sides of the silver plastic composition. Put a cooking sheet on the silver plastic composition and cardboard, rotate the roller so that both ends of the roller are on the cardboard on both sides, and extend the silver plastic composition to a thickness of 1 mm and a size of about 30 mm x 30 mm. A plate-like plate 1 shown in 1 (a) was formed.

  The formed plate 1 of the silver plastic composition is punched into a circular shape (through hole 2) using the circle cutter, and as shown in FIG. The width of the two edge portions was cut into a rectangular shape so that only the end portion on which the ornament 3 was fitted was 6 mm, and the remaining portion was 3 mm. I made two in total.

Water was applied between the plates 1 and 1 while the decorative object (synthetic opal) 3 was sandwiched between the edges of the plates 1 and 1 formed as shown in FIG.
At that time, as shown in FIG. 1 (d), both sides of the ornament (synthetic opal) 3 are pressed and sandwiched so as not to come off, and lightly applied to the central axis of the ornament 3 from both sides as shown in FIG. 1 (e). And fixed.
Hereinafter, the shaped body in which the decorative object 3 is sandwiched between the plates 1 and 1 is referred to as a ring (square ring) 4.
After completely drying using a drier in this state, the edge of the ring 4 was filled with a silver paste composition so that it did not appear to be laminated, and then dried again.
The entire ring 4 was smoothed with a paper file.

Next, a circle (finished size + No. 5) was drawn on the ring with a circle ruler with a pencil (No. 20 in this case). The reason why the size is larger by +5 than the finished size is in anticipation of shrinkage after firing.
Here, confirm the position of diameter size No. 20 on the truncated cone-shaped wood core bar that becomes thinner toward the tip, and a paper file (for example, “Refill Roll # 220”, manufactured by Sumitomo 3M Co., Ltd.) in the vicinity. I wrapped it.
Then, the wood core rod was passed through the through hole of the ring, and while turning the ring, the inner side (inner edge) of the through hole was shaved to prepare No. 20. During the work, a cored bar with a size was inserted into the through hole of the ring, and the work was continuously performed while checking the size. The outer shape of the ring was also trimmed with a paper file.

After that, using an electric furnace, firing was performed at a temperature of 800 ° C. for 5 minutes.
At that time, in order to prevent deformation due to its own weight during firing, the ring was laid sideways and fired while supporting the whole with a cotton-like ceramic fiber molded product (trade name “Iso wool molded product”, manufactured by Isolite Kogyo Co., Ltd.). In addition, a cotton-like ceramic fiber molded product was lightly packed in the gap around the ornament 3.
After firing, the whole was polished with a stainless brush to give a silver skin.

Moreover, the ring was warmed with the warm air of the dryer, the fine brush was impregnated with the liquid, and the ring was applied only to the inside of the surface to which the decorative object was bonded.
After black silver sulfide (Ag ₂ S) was formed at a predetermined location, the ring was rinsed well with running water to wipe off moisture.

The edge of the ring was roughened with a diamond point of a cutting and polishing tool (trade name “Handleuter”, manufactured by Toyo Associates, Inc.).
The ring edge and the inside of the ring were polished with a spatula and finished to a mirror surface to complete the square ring 4 (FIG. 2).
The obtained ring 4 is a decorative metal article in which a plurality (two) of plates 1, 1 are branched from a base portion, and a decorative object 3 is sandwiched between the ends of the plates 1, 1. Since there are many portions that are not in contact with the plate 1, that is, exposed portions, the form and cut of the ornament 3 can be seen well and look beautiful. Furthermore, since light can be taken in from the side and the back side, irregular reflection of light is remarkably high, and the decoration 3 and the ring 4 as a whole look more beautiful.
In addition, although it explained that the edge part of the ring 4 was filled with the silver paste-like composition so that it might not look like a laminated form, this edge part is the edge part on the back side of the drawing, the left and right sides The edge part of the front side of the drawing and the end edge part on the front side of the drawing were intentionally made visible in a laminated form.

When the ornament is approximately spherical as in this embodiment, for example, in the conventional method of embedding, even if the lower half of the approximately spherical ornament is embedded in the plastic composition, it is substantially hemispherical by firing. In some cases, the decorative portion is detached so that the decorative object is pushed out. In order to prevent such detachment, it was necessary to embed the decorative article deeper than the lower half in the plastic composition so as to be physically wrapped. However, in this case, since the lower half or more of the substantially spherical ornament is embedded in the plastic composition, there is a disadvantage that the exposed portion is extremely small.
On the other hand, in the present invention, the ornament 3 is sandwiched between the plates 1 and 1, so that both ends corresponding to the diameter of the substantially spherical ornament 3 are sandwiched as shown in FIG. Since the object 3 can be sandwiched and further contracts in the direction of the arrow in the figure by firing, it is more firmly fixed without being detached. As is clear from FIG. 1 (e), the decorative object 3 has exposed the top and bottom surfaces and most of the side surfaces, so that the form and cut of the decorative object can be seen clearly and beautifully. It will be visible.

[Example 2]
In the bonding step of the first embodiment, the mounting frame 5 shown in FIG. 3B is sandwiched between the plates 1 and 1 instead of the decorative object, and the decorative frame (synthetic emerald) is attached to the mounting frame 5 after firing. A square ring 7 shown in FIG. 3 (a) was produced in exactly the same manner except that the decorative object 6 was fixed by laying down the six locking claws of the mounting frame 5 with a Yatco.
In the obtained ring 7, a plurality (two) of plates 1, 1 are branched from the base portion, and an ornament 6 attached to the mounting frame 5 is sandwiched between the ends of the plates 1, 1. Since there are many parts that are not in contact with the plate 1 of the decorative object 6, that is, exposed parts, the form and cut of the decorative object 6 can be seen well and look beautiful. Furthermore, since light can be taken in from the side and the back side, irregular reflection of light is remarkably high, and the decoration 6 and the ring 7 as a whole look more beautiful.

Example 3
A square ring 8 shown in FIG. 4 was produced in the same manner as in Example 1 except that six plates 1 were used and one or two decorative objects 3 were sandwiched between the plates.
The obtained ring 8 is a decorative metal article in which a plurality (six) of plates 1... Are branched from the base portion, and the ornament 3 is sandwiched between the ends of the plates 1. Since there are many portions that are not in contact with the plate 1, that is, exposed portions, the form and cut of the decorative object 3 can be seen well and look beautiful. Furthermore, since light can be taken in from the side and the back side, irregular reflection of light is remarkably high, and each decoration 3 and the entire ring 8 look more beautiful.

Example 4
Using six plates 1, one or two mounting frames 5 are sandwiched between the plates, and a decorative object (synthetic emerald) 6 is placed on the mounting frame 5 after firing, and the mounting frame 5 A square ring 9 shown in FIG. 5 was produced in exactly the same manner as in Example 1 except that the four nails were respectively tilted with a jar and the ornament 6 was fixed.
The obtained ring 9 is a decoration in which a plurality (six) of plates 1... Are branched from the base portion, and an ornament 6 attached to the attachment frame 5 is sandwiched between the ends of the plates 1. Since it is a metal article and there are many portions that are not in contact with the plate 1 of the ornament 6, that is, exposed portions, the form and cut of the ornament 6 can be seen well and look beautiful. Furthermore, since light can be taken in from the side and the back side, irregular reflection of light is remarkably high, and each decoration 6 and the entire ring 9 look more beautiful.

(A) A perspective view showing a plate, (b) a perspective view showing a state in which a through-hole is formed in the plate, (c) a perspective view showing a state in which a decorative object is sandwiched between the plates, and (d) a decorative object sandwiched in between. It is a perspective view which shows the state to hold down, (e) It is a perspective view which shows the state which hold | maintained the ornament reliably. 1 is a perspective view showing a square ring obtained by Example 1. FIG. (A) The perspective view which shows the square ring obtained by Example 2, (b) It is the perspective view which notched a part which shows the frame for attachment used in Example 2. FIG. 6 is a perspective view showing a square ring obtained by Example 3. FIG. It is a perspective view which shows the square ring obtained by Example 4. FIG.

Explanation of symbols

1 Plate 2 Through-hole 3 Decoration (Synthetic Opal)
4 Square ring 5 Mounting frame 6 Decoration (synthetic emerald)
7 Square ring 8 Square ring 9 Square ring

Claims (6)

A plate forming step of forming a plate by forming a plastic composition containing at least one powder selected from silver, gold, platinum, copper and alloys thereof and an organic binder into a plate shape;
A pasting step of pasting at least a portion of the plates other than the ends in a state where at least one decorative object is sandwiched between the ends of at least two plates;
A composition drying step for drying the shaped article that has undergone the bonding step;
A method for producing a decorative metal article, comprising: a composition firing step of firing a shaped article that has undergone the composition drying step. A plate forming step of forming a plate by forming a plastic composition containing at least one powder selected from silver, gold, platinum, copper and alloys thereof and an organic binder into a plate shape;
A bonding step of bonding at least a portion of the plates other than the ends in a state where at least one attachment frame is sandwiched between the ends of at least two plates;
A composition drying step for drying the shaped article that has undergone the bonding step;
A composition firing step of firing the shaped article that has undergone the composition drying step;
A decorative metal article manufacturing method comprising: an ornament attachment step of attaching an ornament to an attachment frame fixed to the shaped article.   In the bonding step, the plates are bonded together with a paste-like composition containing at least one powder selected from silver, gold, platinum, copper, and alloys thereof and an organic binder, or water. A method for producing a decorative metal article according to claim 1 or 2.   The manufacturing of the decorative metal article according to any one of claims 1 to 3, further comprising a through-hole forming step of forming a hole penetrating in the thickness direction in the plate before the composition baking step. Method.   2. The plastic composition includes silver powder or silver alloy powder, and a liquid for sulfiding silver is applied to the inside of a plate sandwiching an ornament or a mounting frame after the composition baking step. The manufacturing method of the decorative metal article as described in any one of -4.   A decorative metal article, wherein a plurality of plates are branched from a base portion, and a decorative object or a decorative object attached to an attachment frame is sandwiched between end portions of the plate.

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