JP2000024753A - Manufacture of ornament formed of precious metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a casting of the expression close to that of leaves or flowers of grasses or trees, and to reduce the weight by using leaves and flowers small in thickness for a mold, applying a solidifying agent, pouring gypsum, heating it to form a cavity, and casting a molten base metal into the cavity. SOLUTION: A solidifying agent 8 is applied to a face side or a back side of leaves to solidify them, and their shape is arranged to a desired one to form a mold 7. The mold 7 is mounted on a runner 6, a casting ring 1 is covered thereon, gypsum 20 is poured therein to embed the mold 7. After the gypsum is dried, the casting ring 1 is detached from a conical base 3, and placed in an electric furnace, and heated to bake the gypsum 20. The casting ring 1 having a specified cavity is set upside down, and set to a graphite crucible, a chamber is covered thereon, and its inside is evacuated. A molten base metal is poured from a hole in a bottom part under the positive pressure. When the casting of the base metal is completed, the casting ring 1 is taken out, and placed in water to break the gypsum 20, and a casting of leaf shape is taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a noble metal ornament using a natural product directly as a prototype of the ornament instead of wax.

[0002]

2. Description of the Related Art Heretofore, a lost wax method has been widely used as a method for producing precious metal decorative articles. In this manufacturing process, as shown in FIG. 5, after a prototype of a decorative article is made of silver or the like (S1), a large number of wax patterns are formed using a rubber mold (S2), and a runner is attached to the wax pattern. After setting in a mold frame (S3), gypsum is poured around the mold to bury the wax pattern in the gypsum (S4). The gypsum is dried and then heated to melt the wax pattern and flow out of the gypsum (S5). A metal such as gold or platinum is melted and cast into the cavity in which the wax pattern has been eluted (S6). After natural cooling, the gypsum is broken to take out a cast product (S7), and is polished to finish it into a finished product.

[0003]

However, in the above-mentioned conventional method for producing a noble metal ornament, a master of the ornament is first made of silver, and then a large number of waxes are formed from the original mold. We make patterns or, in the case of individual products, make prototypes directly with wax. For this reason, when using natural products such as leaves and flowers as motifs, the thinness of leaves, each leaf vein, and the natural feeling of petals can not be expressed to the fine parts like the real thing, casting In addition to the fact that the whole product becomes thicker, there is a problem that the product becomes thicker and heavier.

Therefore, an object of the present invention is to directly use a natural product as a prototype without using wax.
An object of the present invention is to provide a decorative article that enables a more realistic expression. Another object of the present invention is to reduce the weight of a decorative article.

[0005]

In order to solve the above-mentioned problems, a method for manufacturing a noble metal decorative article according to claim 1 of the present invention uses a natural product having a small thickness as a prototype of the decorative product, and After applying a solidifying agent to at least one of the front and back surfaces so that the shape of the natural product does not collapse, the plaster is poured around the natural product and buried in the plaster, and then the gypsum is heated to produce the natural product. Is characterized in that a cavity is formed in the plaster by burning off the molten metal, and a molten metal is cast into the cavity.

According to a second aspect of the present invention, there is provided a method for manufacturing a precious metal decorative article, wherein a natural product is used as a prototype of the decorative article, and plaster is poured around the natural product, buried in the plaster, and then plastered. Is heated to burn off natural products, thereby creating a cavity in the plaster and casting a melted metal in the cavity.

The natural products used in the present invention include, in addition to directly using the leaves, flowers and fruits of plants and trees, processed products which retain the shape and pattern of the natural products as they are, and processed products having a natural texture. Products are also included, and consequently, any material that can be burned off so that no slag remains when heated at a high temperature can be included. The leaves and flowers of the plants are not particularly limited by the type of the plants. It is also possible to use not only leaves and flowers just obtained from plants but also dried leaves. There is no restriction on the size of leaves or flowers, and a single petal can be used for the entire flower.

The natural product of the present invention is not restricted by the size and shape of the thickness. However, when a natural product having a small thickness is used as a prototype, an expression close to a real product that cannot be obtained with a wax prototype can be obtained. And the effect of the present invention is exhibited.

Further, in the present invention, when a thin natural product having a small thickness is used, there is a possibility that the shape may be lost when the product is buried directly in gypsum. Therefore, in the present invention, a solidifying agent is applied to the surface or the back surface of the natural product so that the shape of the natural product does not collapse. Types of this solidifying agent include beeswax, varnish, oily paint, chemical paste, hair spray,
Manicure, instant adhesive, etc. can be used. By applying these solidifying agents thinly on one side of the natural product (the back surface when it is a decorative product), the shape of the natural product is retained, and the shape does not collapse even when buried in gypsum . Another purpose of applying the solidifying agent is to increase the thickness of a natural product that is too thin. This is because the melted metal does not sufficiently flow to the tip of the cavity when the prototype is too thin.

[0010] In the present invention, thick natural products such as pine trees and cotton husks can also be used. Since these do not lose their shape without the application of a solidifying agent, they can be directly buried in gypsum.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing a noble metal ornament according to the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a mold frame for setting a prototype of a decorative body made of a natural product, and FIG. 3 shows a casting machine which inserts the mold frame and suction-presses. 1 and 2, reference numeral 1 denotes a casting ring in which a number of small holes 2 are randomly formed around the entire circumference, and reference numeral 3 denotes a rubber truncated cone disposed below the casting ring 1. A peripheral flange 4 for fitting the casting ring 1 is formed in an outer peripheral portion of the truncated cone 3, and a hemispherical upright portion 5 is formed in a central portion. A tree-shaped runner 6 made of wax is erected on the center stand 5. Reference numeral 7 denotes a prototype made of leaves of plants and flowers, a plurality of which are attached along the runner 6. A solidifying agent 8 is applied to the back side of the leaf of the plant to keep the shape of the leaf.

The casting machine 10 shown in FIG. 3 is provided with a suction pressurizing device 12 below the base plate 11, and can apply a predetermined pressure while sucking the inside of the chamber 13. A mounting table 14 is provided on the base plate 11, and the above-described casting ring 1 is mounted thereon. Also,
Above the mounted casting ring 1, a graphite crucible 15 for dissolving a metal such as gold or platinum is arranged. A coil 16 for high-frequency heating is wound around the graphite crucible 15, and a hole 18, which is always plugged with a carbon rod 17, is formed at the bottom of the graphite crucible 15.

Next, a manufacturing process when leaves of plants and trees are used as a prototype of a decorative article will be described with reference to FIGS. First, a real leaf of a plant is prepared, and a solidifying agent 8 such as a varnish or an adhesive is applied to the back surface of each of the leaves to solidify the leaves of the plant and at the same time prepare a desired shape to obtain a prototype 7 (S
11). Further, by applying the solidifying agent 8, the thickness is increased over the entire surface, and the inflow of the metal is facilitated. When a material other than the leaves of plants and trees is used, the prototype 7 can be made by the same means as described above. When a natural product having a large thickness that can maintain a certain shape without applying the solidifying agent 8 is used as a prototype, the solidifying agent applying step of S11 is omitted.

Next, the prototype 7 made of the above-mentioned leaves is attached to the runner 6, and the runner 6 is attached to the center stand 5 of the truncated cone 3 (S12). Then, the casting ring 1 is put on the casting ring 1, and the plaster 20 is poured into the casting ring 1 to bury the prototype 7 (S13). Immediately after the pouring, air bubbles contained in the gypsum 20 are removed using a vacuum defoaming device or the like.

After natural drying, the casting ring 1 is removed from the truncated cone 3 and placed in an electric furnace. While gradually increasing the temperature of the electric furnace, the furnace is heated to about 800 ° C., and the temperature is maintained for about one hour to harden the gypsum 20. In the process of baking the gypsum 20, the wax forming the runner 6 melts and flows out of the hemispherical recess 9 formed in the trace of the centering portion 5. In addition, since the prototype 7 is burned out and burned out by the heating of the gypsum 20 (S14), a cavity 23 having the same shape is formed in the portion where the prototype 7 was located as shown in FIG. Communicates with 21.

The casting ring 1 in which the predetermined cavity 23 is formed in the gypsum 20 is turned upside down, and the casting apparatus 10
Is opened and placed on the mounting table. After setting so that the concave portion 21 of the casting ring 1 is located just below the graphite crucible 15, the chamber 13 is covered and closed to suck the inside. After heating the graphite crucible 15 to dissolve the metal, such as gold, platinum, or alloy, contained therein, the carbon rod 17 is pulled out, and the molten metal is poured from the bottom hole 18 into the recess 21 while being pressurized ( S15). The poured metal flows through the runner 6 into the cavity 23 formed in the prototype 7.

At this time, the interior of the chamber 13 is depressurized by the suction and pressurizing device 12 and the peripheral surface of the casting ring 1 is provided with many small holes 2. The poured metal is sucked, and the metal spreads to every corner of the cavity 23. Therefore, even if the wall thickness is as thin as a leaf of a plant or the like, there is no possibility that the metal does not reach the whole and a part of the leaf is chipped. In particular, since a large number of small holes 2 are evenly provided on the peripheral surface of the casting ring 1, the entire cavity 23 is uniformly sucked. As described above, the runner 6 is formed in a tree shape, and a large number of prototypes 7 are formed. The yield when casting at the same time is improved.

After the casting of the metal is completed, the casting machine 10
From the casting ring 1 and put it in water
And take out a leaf-shaped casting from inside. After pickling, the casting surface is cleaned and further polished, and then a chain is attached when used as a pendant, and a pin or clip is brazed when used as a broach (S16).

[0019]

As described above, according to the production method of the present invention, a natural product having a small thickness is directly used as a prototype without using wax as a prototype of a decorative product.
A cast product with an expression very close to the natural product used for the prototype could be obtained, and the weight of the prototype could be reduced by reducing the thickness of the prototype.

Further, according to the present invention, the shape of a natural product can be firmly maintained by applying a solidifying agent, and the thickness can be adjusted. In addition to the collapse, there is an effect that the ingot is sufficiently cast into the cavity.

Further, according to the above-mentioned manufacturing method, various natural products including not only natural products having a small thickness but also thick ones can be used as a prototype of a decorative product. The width could be expanded.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a casting ring used in a method for manufacturing a noble metal ornament according to the present invention.

FIG. 2 is a sectional view of the casting ring.

FIG. 3 is a cross-sectional view of a casting machine used in the method for manufacturing a noble metal ornament according to the present invention.

FIG. 4 is a process chart showing a manufacturing process of the noble metal decoration according to the present invention.

FIG. 5 is a process diagram showing a manufacturing process of a conventional noble metal decorative article.

[Explanation of symbols]

 Reference Signs List 1 casting ring 7 prototype 8 solidifying agent 10 casting machine 20 gypsum 23 cavity

[Procedure amendment]

[Submission date] September 27, 1999 (September 9, 1999
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Manufacturing method of precious metal ornaments

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a noble metal ornament using a leaf or a flower of a small thickness as a prototype of an ornament directly instead of wax.

[0002]

2. Description of the Related Art Heretofore, a lost wax method has been widely used as a method for producing precious metal decorative articles. In this manufacturing process, as shown in FIG. 5, after a prototype of a decorative article is made of silver or the like (S1), a large number of wax patterns are formed using a rubber mold (S2), and a runner is attached to the wax pattern. After setting in a mold frame (S3), gypsum is poured around the mold to bury the wax pattern in the gypsum (S4). The gypsum is dried and then heated to melt the wax pattern and flow out of the gypsum (S5). A metal such as gold or platinum is melted and cast into the cavity in which the wax pattern has been eluted (S6). After natural cooling, the gypsum is broken to take out a cast product (S7), and is polished to finish it into a finished product.

[0003]

However, in the above-mentioned conventional method for producing a noble metal ornament, a master of the ornament is first made of silver, and then a large number of waxes are formed from the original mold. We make patterns or, in the case of individual products, make prototypes directly with wax. For this reason, when using natural products such as leaves and flowers as motifs, the thinness of leaves, each leaf vein, and the natural feeling of petals can not be expressed to the fine parts like the real thing, casting In addition to the fact that the whole product becomes thicker, there is a problem that the product becomes thicker and heavier.

It is an object of the present invention to provide a decorative article which can express more realistically by using leaves and flowers of small thickness directly as a prototype without using wax. . Another object of the present invention is to reduce the weight of a decorative article.

[0005]

In order to solve the above-mentioned problems, a method for producing a noble metal ornament according to claim 1 of the present invention uses a leaf or a flower of a small thickness as a prototype of the ornament,
A solidifying agent is applied to at least one of the front and back surfaces of the leaves and flowers of the plant so that the shape of the leaves and flowers of the plant does not collapse, and then plaster is poured around the leaves and flowers of the plant and buried in the plaster. After heating the plaster ,
It is characterized in that a cavity is created in gypsum by burning out flowers , and a molten metal is cast in the cavity.

[0006] Leaves and flowers of plants and plants used in the present invention
Is not particularly limited by the type of vegetation. Or plants
Not only the leaves and flowers that we just picked but also the dead leaves are dried
Can also be used. Limiting the size of leaves and flowers
Use one petal even for the whole flower without receiving
You can also .

In the present invention, when leaves or flowers of plants and plants having a small thickness are used as prototypes, it is possible to express a real thing which cannot be obtained with a wax prototype, and the effects of the present invention are exhibited.

[0008] In the present invention, plants having a small thickness are used.
When leaves and flowers are used, the shape may be lost when buried in plaster as it is. Therefore, in the present invention, so as not to collapse the shape of the plants leaves and flowers, plants leaves
Apply a solidifying agent to the front or back of the flower or flower . Types of this solidifying agent include beeswax, varnish, oil paint, chemical paste,
Hair pres, nail polish, instant adhesives, etc. can be used. One side of these solidifying agent the plants of leaves and flowers grass by thinly applied to the entire surface (back surface at the time of the ornaments)
The shape of the leaves and flowers is retained, and the shape does not collapse when buried in plaster. Another purpose of applying the solidifying agent is to increase the thickness of a natural product that is too thin. This is because the melted metal does not sufficiently flow to the tip of the cavity when the prototype is too thin.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method for manufacturing a noble metal ornament according to the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 show a mold frame for setting a prototype of a decorative body made of a natural product, and FIG. 3 shows a casting machine which inserts the mold frame and suction-presses. 1 and 2, reference numeral 1 denotes a casting ring in which a number of small holes 2 are randomly formed around the entire circumference, and reference numeral 3 denotes a rubber truncated cone disposed below the casting ring 1. A peripheral flange 4 for fitting the casting ring 1 is formed in an outer peripheral portion of the truncated cone 3, and a hemispherical upright portion 5 is formed in a central portion. A tree-shaped runner 6 made of wax is erected on the center stand 5. Reference numeral 7 denotes a prototype made of leaves of plants and flowers, a plurality of which are attached along the runner 6. A solidifying agent 8 is applied to the back side of the leaf of the plant to keep the shape of the leaf.

The casting machine 10 shown in FIG . 3 is provided with a suction and pressurizing device 12 below the base plate 11 and can apply a predetermined pressure while sucking the inside of the chamber 13. A mounting table 14 is provided on the base plate 11, and the above-described casting ring 1 is mounted thereon. Also,
Above the mounted casting ring 1, a graphite crucible 15 for dissolving a metal such as gold or platinum is arranged. A coil 16 for high-frequency heating is wound around the graphite crucible 15, and a hole 18, which is always plugged with a carbon rod 17, is formed at the bottom of the graphite crucible 15.

[0011] Next, a description will be given of a manufacturing process when using leaf plants as original ornaments in FIGS. First, a real leaf of a plant is prepared, and a solidifying agent 8 such as a varnish or an adhesive is applied to the back surface of each of the leaves to solidify the leaves of the plant and at the same time prepare a desired shape to obtain a prototype 7 (S
11). Further, by applying the solidifying agent 8, the thickness is increased over the entire surface, and the inflow of the metal is facilitated. When a material other than the leaves of plants and trees is used, the prototype 7 can be made by the same means as described above.

[0012] Then, attach the original 7 made from leaves of the plants in the runner 6, attach the runner 6 to the core standing section 5 of the truncated cone 3 (S12). Then, the casting ring 1 is put on the casting ring 1, and the plaster 20 is poured into the casting ring 1 to bury the prototype 7 (S13). Immediately after the pouring, air bubbles contained in the gypsum 20 are removed using a vacuum defoaming device or the like.

[0013] After air drying, put in an electric furnace to remove the casting ring 1 from the truncated cone 3. While gradually increasing the temperature of the electric furnace, the furnace is heated to about 800 ° C., and the temperature is maintained for about one hour to harden the gypsum 20. In the process of baking the gypsum 20, the wax forming the runner 6 melts and flows out of the hemispherical recess 9 formed in the trace of the centering portion 5. In addition, since the prototype 7 is burned out and burned out by the heating of the gypsum 20 (S14), a cavity 23 having the same shape is formed in the portion where the prototype 7 was located as shown in FIG. Communicates with 21.

In this way, the casting ring 1 in which the predetermined cavity 23 is formed in the gypsum 20 is turned upside down,
Is opened and placed on the mounting table. After setting so that the concave portion 21 of the casting ring 1 is located just below the graphite crucible 15, the chamber 13 is covered and closed to suck the inside. After heating the graphite crucible 15 to dissolve the metal, such as gold, platinum, or alloy, contained therein, the carbon rod 17 is pulled out, and the molten metal is poured from the bottom hole 18 into the recess 21 while being pressurized ( S15). The poured metal flows through the runner 6 into the cavity 23 formed in the prototype 7.

[0015] Through this time, the chamber 13 has been depressurized by the suction pressure device 12, and since a large number of small holes 2 on the peripheral surface of the casting ring 1 is provided, remaining in the gypsum 20 bubbles The poured metal is sucked, and the metal spreads to every corner of the cavity 23. Therefore, even if the wall thickness is as thin as a leaf of a plant or the like, there is no possibility that the metal does not reach the whole and a part of the leaf is chipped. In particular, since a large number of small holes 2 are evenly provided on the peripheral surface of the casting ring 1, the entire cavity 23 is uniformly sucked. As described above, the runner 6 is formed in a tree shape, and a large number of prototypes 7 are formed. The yield when casting at the same time is improved.

[0016] After the completion of the casting of ingots, casting machine 10
From the casting ring 1 and put it in water
And take out a leaf-shaped casting from inside. After pickling, the casting surface is cleaned and further polished, and then a chain is attached when used as a pendant, and a pin or clip is brazed when used as a broach (S16).

[0017]

As described above, according to the manufacturing method of the present invention , leaves and flowers having small thickness are directly used as prototypes without using wax as prototypes of ornaments. It was possible to obtain a cast product that was very close to the leaves and flowers of plants and flowers , and to reduce the weight of the prototype by reducing its thickness.

Further, according to the present invention, it is possible to securely hold the plants leaves and flowers shape by applying a solidifying agent, it is possible to adjust the thickness, when was buried in the gypsum In addition to the shape being not collapsed, there is an effect that the ingot is sufficiently cast into the cavity.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a casting ring used in a method for manufacturing a noble metal ornament according to the present invention.

FIG. 2 is a sectional view of the casting ring.

FIG. 3 is a cross-sectional view of a casting machine used in the method for manufacturing a noble metal ornament according to the present invention.

FIG. 4 is a process chart showing a manufacturing process of the noble metal decoration according to the present invention.

FIG. 5 is a process diagram showing a manufacturing process of a conventional noble metal decorative article.

[Description of Signs] 1 Casting ring 7 Prototype 8 Solidifying agent 10 Casting machine 20 Gypsum 23 Cavity

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shoji Yamada 557-4 Shinohara, Ryuo-cho, Nakakoma-gun, Yamanashi Pref.

Claims (2)

[Claims] 1. A natural product having a small thickness is used as a prototype of an ornament, and a solidifying agent is applied to at least one of the front surface and the back surface of the natural product so that the shape of the natural product does not collapse.
After pouring gypsum around this natural product and burying it in the plaster, heat the gypsum to burn out the natural product, create a cavity in the plaster, and cast the melted metal in the cavity. Manufacturing method of precious metal ornaments. 2. Using a natural product as a prototype of an ornament, pouring gypsum around the natural product and burying it in the plaster, heating the gypsum to burn off the natural product, thereby forming a cavity in the gypsum. A method of manufacturing a noble metal ornament, comprising: making and casting a melted metal in the cavity.