JPH116003A - Method for molding precious ornament, and master mold for use in this method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new molding method for a precious ornament using a pasty noble metal in a threadlike state and to provide a new precious ornament having a shape so far impossible to obtain. SOLUTION: A matrix 1 is formed by mixing a ceramic material powder, having a burning temp. higher than that of a noble metal to be used, into wax. Water, organic solvent, etc., are added to a powdery noble metal to form the powdery noble metal into pasty state. The resultant pasty noble metal 15 is pushed out of a cylinder 9 through a die 10 and formed into threadlike state. The resultant tread 17 is wound around the matrix 1 and provided with the desired shape of precious ornament, followed by burning.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming jewelry, and more specifically, a precious metal powder made into a paste form using an organic solvent or the like, extruded into a thin line from the tip of a nozzle and extruded into a matrix. Wrap around to give the form,
The present invention relates to a method for forming a jewelry article, which is then fired and shaped.

[0002] The present invention also relates to a matrix used in the above-mentioned molding method.

[0003]

2. Description of the Related Art In recent years, new materials have been developed in which a noble metal powder such as gold, silver or platinum is added with water or an organic solvent as a binder to form a clay or paste. Using this clay-like material, it was shaped into a certain shape in the same way as clay work, and put into a high-temperature furnace to evaporate and burn water and organic solvents, and fired the noble metal in that shape Jewelry is being made.

[0004]

However, in the above-mentioned manufacturing method, since it is the same method as clay work, the shape to be formed is naturally limited.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and uses a paste-like noble metal material in the form of a thin line to form a shape which cannot be obtained by a conventional molding method, and fire the same. An object of the present invention is to provide a molding method that can maintain the shape even when it is performed.

[0006]

In order to solve the above-mentioned problems, in the present invention, the above-mentioned clay-like or paste-like noble metal is used. Then, a material having a higher sintering temperature than the noble metal used, for example, a ceramic material such as alumina mixed, which burns and disappears at a relatively low temperature, for example, prepares a matrix or core formed using wax, The paste-like noble metal is extruded in a thread form using an extruder equipped with a die at the tip, and is wound around the core. This is put in a furnace and baked at a temperature at which the noble metal is baked, and baked.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing an example of a matrix or core 1 used in the molding method of the present invention, and FIG. 2 is an enlarged cross-sectional end view taken along line 2-2.

The core 1 in the present embodiment is in the form of an elliptical ring. Although this core 1 in the present embodiment is integrated, it is composed of two parts. That is, as shown in FIG. 2, the central part 3 and the surface part 5 are formed.

The central portion 3 is formed by mixing alumina powder, which is one of ceramic materials, with wax. On the other hand, the surface layer portion 5 is formed of only wax. The central portion 3 has a substantially semicircular cross section, and the surface layer portion 5 has a shape like an upper half of a crescent and covers from the outer peripheral side of the central portion to the top, and the thickness becomes thinner toward the top. It is formed as follows. The central portion 3 is manufactured using a mold (not shown) corresponding to the shape. Melt the wax in a mold, mix the appropriate amount of alumina powder into it, make it uniform throughout, and cool it. Next, wax is put into a surface layer mold (not shown), heated and liquefied once, and then cooled. At the time of cooling to an appropriate temperature, the central portion 3 is pushed into the mold and cooled while adjusting the shape. And solidify.

In the present embodiment, the above-described core is used, but the present invention is not limited to this. The shape of course depends on the shape of the jewelry to be produced. Not only a ring-shaped thing but a solid core is also used. In addition, core 1
Does not necessarily have to have a surface layer as described later.

FIG. 3 shows an extruder 7 used in the present embodiment.
FIG. 3 is a cross-sectional view with a portion cut away. The extruder 7 includes a hollow cylinder 9, a die 10 and a piston 13 which are detachably attached to a tip of the cylinder 9. A paste-like noble metal, for example, 24K gold 15 as a raw material placed in the cylinder 9 is extruded in a state of a thread 17 from a hole 11 of a die 10 by pushing a piston 13. Since the paste-like gold 15 has an appropriate viscosity, it does not lose its shape. Hole 1 of die 10
By changing the shape of No. 1, yarns 17 having various cross-sectional shapes can be obtained.

The thread 17 extruded in this way is
As shown in the figure, the core 17 is wound around the core 1 and the thread 17 is used to form a target jewelry shape. The winding method may be freely changed according to the shape of the jewelry to be made. In the case of the core 1 in this embodiment, the core 1 cannot be wound as a continuous single thread, but may be wound sequentially from the upper side and the lower side of the core 1 and connected appropriately. The winding is not limited to a single winding, and the winding may be double or triple. However, for the reason described below, the core 1
Is not completely sealed inside, but is meshed so that at least a part thereof is formed with small eyes.

The core 1 wound with the yarn 17 is put into a furnace and fired at a firing temperature suitable for the noble metal used for a predetermined time. For example, in the case of gold used in this embodiment, baking is performed at about 1000 ° C., while in the case of using silver, baking is performed at 900 ° C. At that time, the wax in the surface layer portion 5 of the core 1 and the wax contained in the central portion 3 are burned out, but the alumina contained in the central portion 3 does not disappear. Since the temperature of the furnace at this time is lower than the firing temperature of alumina, the alumina does not completely sinter, and the alumina powder is bonded to each other with a weak force to maintain its three-dimensional shape.

On the other hand, in the paste-like gold thread 17, the water contained therein and the organic solvent as a binder evaporate and burn off, leaving only the gold, which is fired in its original form. At this time, as described above, since the alumina powder contained in the core 1 maintains a shape substantially similar to the original core 1, the shape formed by the yarn 17 during firing is deformed. ,
For example, the upper part does not sink. When the core 1 is made of only wax, the shape supporting the shape made of the gold thread disappears before the gold is fired, so that the shape cannot be maintained and the shape is crushed. In firing, the shape formed by the yarn 17 shrinks, and the shrinkage is given by burning out the surface layer portion 5 of the core 1. It should be noted that the shrinkage allowance is given a little by burning out the wax contained in the central portion 3. Therefore, the shape of the jewelry to be formed,
Depending on the size, the core 1 may be composed of only the central portion 3.

The fired article is taken out, and the alumina powder remaining inside is taken out. As mentioned above, this alumina is not completely calcined, but is only bonded with a very weak force, so the product can be easily powdered inside the product simply by shaking it with the hand. Spills from the mesh of the goods. Even if the connection is a little strong, you can easily break it by inserting something like a thin wire inside. Thus, a product 19 in which only the noble metal is fired as shown in FIG. 5 is obtained.

The noble metals used include, but are not limited to, gold, silver, platinum and the like. It is also possible to use magnetic earth, which is a material of porcelain. In this specification, the term "noble metal" is used to include these. As the ceramic material, silicon oxide, zirconia, or the like can be used. In the example described above, a hollow product 19 is obtained, but it is of course possible to wind the thread 17 only on the upper surface side of the matrix.

[0017]

As is apparent from the above description, according to the present invention, the jewelry is shaped by winding the paste-like noble metal into a thread and winding it around the matrix, and then firing the same. It is also possible to create shapes that cannot be obtained by shaping clay in a manner similar to clay work. During firing, the matrix wax is burned out, but the ceramic material in the matrix retains its shape, thereby retaining the shape imparted by the yarn and deforming the shape. Never.

[Brief description of the drawings]

FIG. 1 is a plan view of a mother die (core) used in the jewelry molding method of the present invention.

FIG. 2 is an enlarged sectional end view taken along line 2-2 of FIG. 1;

FIG. 3 is a partially cutaway cross-sectional view of an extruder used to practice the present invention.

FIG. 4 is a plan view showing a state in which a paste-like noble metal thread is wound around a matrix.

FIG. 5 is a side view showing an example of a product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Matrix (core) 3 Center part 5 Surface layer part 7 Extruder 10 Die 11 Die hole 15 Paste noble metal 17 Thread 19 Product

Claims (9)

[Claims] 1. A method of forming a jewelry using a paste-like noble metal obtained by adding water, an organic solvent, or the like to a powdery noble metal, wherein the ceramic material powder has a higher firing temperature than the noble metal. To
Preparing a matrix formed of a material obtained by mixing with a material that is burned down at a temperature lower than the firing temperature of the noble metal, forming the paste-like noble metal in a thread shape, winding the same around the matrix, A method of forming a jewelry item, wherein the shape of the jewelry item to be provided is provided, the matrix around which the noble metal thread is wound is placed in a furnace, and is fired at a firing temperature of the noble metal for a predetermined time. 2. A method according to claim 1, wherein said ceramic material is alumina. 3. The method according to claim 2, wherein the material to be burned off is wax. 4. The molding method according to claim 1, wherein the matrix comprises a center portion and a surface layer portion covering at least a part of the center portion, wherein the center portion includes the ceramic material. A jewelry molding method, characterized by being formed of a material obtained by being mixed with a material to be burned off, wherein the surface layer portion is formed only of the material to be burned away. 5. The jewelry according to claim 1, wherein said paste-like noble metal is put into a cylinder and extruded from a hole of a die provided at a tip of said cylinder to form a thread. Modeling method. 6. The molding method according to claim 1, wherein the noble metal thread wound on the matrix is wound so as to have a mesh at least in a part thereof without completely sealing the matrix. A method of forming jewelry. 7. A matrix used in the molding method according to claim 1, wherein a ceramic material powder having a higher firing temperature than the noble metal is mixed with a material which is burned at a temperature lower than the firing temperature of the noble metal. A matrix, characterized in that it is formed of a material that has been modified. 8. The mold according to claim 7, wherein said ceramic material is alumina and said burnable material is wax. 9. The matrix according to claim 7, wherein the matrix comprises a central portion and a surface layer covering at least a part of the central portion, wherein the central portion is formed of a material which burns the ceramic material. A matrix which is formed of a material obtained by mixing, and wherein the surface layer portion is formed only of the burnt-out material.