JPH05168508A - Metal product and method of manufacturing the same - Google Patents

Abstract

PURPOSE:To manufacture metal products like precious metal ornaments and industrial art works having amalgam materials united with castings. CONSTITUTION:A metal product has a casting united with an attachment part containing at least one kind of platinum, palladium, iron, cobalt, nickel, chromium and manganese and preventing the progress of amalgamation to fill up the amalgam in the attachment part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal product such as a precious metal jewelery or arts and crafts in which an amalgam material and a cast body are integrated, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, the lost wax casting method has been the main processing method in the production of precious metal jewelry and arts and crafts. The features (advantages) of the lost wax casting method described above are that the degree of freedom in design is extremely large, and that complicated shapes can be reproduced with high reliability, and it has become established in the industry as a mature technology.

Pure metals such as gold (Au), silver (Ag), and platinum (Pt) may be used as the precious metals used in the above-mentioned precious metal jewelry, but mainly improve mechanical properties such as strength. Therefore, in order to obtain a change in color tone, an additive element such as copper (Cu), nickel (Ni), cobalt (Co), zinc (Zn), aluminum (Al), iron (Fe), and titanium (Ti) is mixed. It is customary to use it as an alloy. And since these alloys have various colors and tones, the degree of freedom in design is expanded. In addition to the above-mentioned precious metals, iron alloys (Fe-others), copper alloys (Cu-others), bronze alloys (Cu-Sn), white copper alloys (N) are used as metals used in arts and crafts.
i-Cu), brass alloy (Cu-Zn), and the like. These alloys were cast, then polished and colored with flame, green-blue, black, yellow or the like by various surface treatments.

The present inventor has proposed a jewelery manufacturing method (Japanese Patent Laid-Open No. 2-185205) for the purpose of further expanding the degree of freedom in the above design. In the above manufacturing method, parts with different color tones (gold alloys) are cast in advance, and these are decorated or formed indefinitely and attached to the surface of the wax model, and different from the parts by the lost wax method. This is a method of casting a gold alloy of a color tone. According to this method, a cast body in which parts are integrated can be obtained without requiring a welding operation, and therefore, it has been established as an extremely effective method today.

However, in this method, since the parts are cast in advance, there is a problem that a two-step casting process is required. Therefore, the present inventor proposed a method for producing a precious metal jewelry by integrally molding jewelry having different color tones by one casting in the previous application (patent application filed on October 29, 1991, reference number 11900027). The above-described manufacturing method forms a plurality of chambers by providing a plurality of weirs in the mold cavity, and supplies various precious metal melts to the respective chambers for casting. According to this method, an integral cast body in which a plurality of precious metals are welded via the weir can be manufactured in one step.

[0006]

However, the above-mentioned prior application has a problem. For example, when a large number of color tones are applied to a relatively small member (such as a ring) by this manufacturing method, each chamber in the mold cavity to be formed becomes extremely small, and the molten metal to which each precious metal melt is supplied. Since the roads are intricately intertwined with each other, the manufacturing of these devices is extremely troublesome. Also, in the case of arts and crafts, the above-mentioned two methods (the method disclosed in JP-A-2-185205, the patent application filed on October 29, 1991, reference number 1).
The method of 1900027) can be applied, but in this case as well, because of the design, it is not uncommon for different colors to be applied to relatively small portions, so the above-mentioned problems similarly occur. Therefore, precious metal jewelery and arts and crafts can be used without the need for a two-step casting process, and when a relatively large number of color tones are applied to a relatively small member or when a relatively small portion is colored differently. There has been a strong demand for a manufacturing method capable of extremely easily producing metal products such as.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above, and a platinum (Pt), palladium (P
d), iron (Fe), cobalt (Co), nickel (N
i), a chromium (Cr), manganese (Mn) one or more containing a mounting portion that does not progress the amalgamation is integrally provided, the mounting portion is filled with amalgam, characterized by a metal product Is.

The present invention also proposes a method for specifically producing the above-mentioned metal product, wherein platinum, palladium, iron, cobalt, nickel, chromium and manganese are contained in the mold cavity in the lost wax method. A mounting frame material containing at least one kind and which does not promote amalgamation is fixed and cast, and the inside of the mounting frame material of the obtained cast body is filled with amalgam.

The above-mentioned metal products in the present invention include precious metal jewelry such as rings and broaches, and arts and crafts such as vases.

Further, the mounting portion in the present invention indicates a portion where amalgam can be filled and mounted, and the shape thereof is usually various concave portions, but it is not particularly limited to this, and the number thereof is not limited to this. It is not particularly limited. And, as the material of the cast body, platinum, palladium,
Select one that contains at least one of iron, cobalt, nickel, chromium, manganese and does not promote amalgamation,
The cast body and the mounting portion may be made of the same material.

As precious metal jewelry and arts and crafts, however, gold alloys and copper alloys that are easily amalgamated are generally used. In such a case, a mounting frame material containing one or more of platinum, palladium, iron, cobalt, nickel, chromium, and manganese that does not promote amalgamation may be provided, and the mounting frame material may be filled with amalgam.

The above-mentioned mounting frame material is indispensable in that even if amalgam is supplied to the inside of the mounting frame material, the amalgamation of the cast metal on the outside of the mounting frame material does not proceed forever. It is a material that is not softened or liquefied by the molten metal or heat during casting, and the surface thereof is required to be a material which is not oxidized or is hardly oxidized even by heating. Therefore, the mounting frame material may be a metal element such as platinum, palladium, iron, cobalt, nickel, chromium, manganese, or the like, which is a metal element that does not amalgamate (or is extremely difficult to form), or an alloy containing one or more of these. However, platinum, platinum-palladium alloy, platinum-platinum-based on the heat resistance (the property that it does not soften or liquefy by heat) and the oxidation resistance (the property that it does not oxidize or is extremely difficult to oxidize) described above.
It is desirable to use a palladium-nickel alloy.

The shape of the mounting frame member is not particularly limited, and for example, a thin plate of platinum or a platinum alloy (thickness 0.1 to 0.2 mm) may be bent and formed into a gutter shape. Alternatively, it may be cylindrical. When the above-mentioned gutter-shaped mounting frame member is applied and integrated with the cast body, the mounting portion formed has a groove shape, and the groove-shaped mounting portion may be filled with amalgam. Also, when a cylindrical mounting frame material is applied and integrated with the cast body, the shape of the mounting portion formed is a hole, but an appropriate blocking material is provided at one open end to fill the amalgam. Then, after fixing the amalgam, the blocking material may be removed.

As described above, according to the present invention, the mounting frame material may or may not be provided depending on the material of the cast body. In either case, the same process as the manufacturing process in the conventional lost wax method may be performed. it can. That is, when using a metal or alloy that is easily amalgamated as a casting metal, it is sufficient to mold a mold cavity so that a mounting portion such as a recess or a hole is formed in the cast body, and a metal or alloy that is difficult to amalgamate is cast metal. When used as
It suffices if the mounting frame material is fixed in the mold cavity and cast, and casting can be performed in the same manner as in the ordinary lost wax method without troublesome work.

After polishing the obtained cast body, the amalgam obtained by kneading pure metal or alloy powder and mercury may be filled in the mounting portion (in the mounting frame member, if a mounting frame member is provided). .. For example, gold (Au), silver (Ag), copper (C
When a highly viscous solid solution obtained by amalgamating the pure metal or alloy powder of u) is prepared and filled with a filler at a pressure of 2 to 3 kgf, the compressive strength is 28 after 5 hours after curing.
~ 42 kg / mm ² , hardness is Brinell hardness (H
It is 60 to 90 in B).

As is well known, amalgam is mercury (H
g) is a general term for other metals, and examples of practical applications include zinc (Zn) and cadmium (C) used in standard batteries.
d) amalgam, lead (Pb), tin (Sn), bismuth (Bi) amalgam used for mirror surface production, tin (Sn) amalgam used as a filler or bonding agent for dentists, organic synthesis Amalgam of sodium (Na) and zinc (Zn) used as a reducing agent in the case of
n) There are amalgams and the like.

The metal to be mixed with mercury is not particularly limited, but since the mounting portion (inside the mounting frame member) usually has a small capacity, a metal supplied as powder is used. In recent years, a technique (method) of spraying a molten metal has been put into practical use as a method for producing metal powder, but according to this method, spherical metal powder is produced. Further, considering the filling workability, when the particle size of the metal powder is 40 μm or less, the surface area is large, so that the contact area with mercury becomes large and the curing time becomes short. On the other hand, in consideration of accuracy, when the particle size is 80 μm or more, the voids between the particles become large, so that the crystals grow large and the dimensional change amount also becomes large. Therefore, the metal to be mixed with mercury is selected to be an amalgam, but the product (jewelry,
While selecting the components based on the color and tone in the design of (arts and crafts), use those with a particle size that considers the filling workability and accuracy as described above.

When the metal powder as described above is kneaded with mercury, the amalgam hardens over time. The reaction at this time is carried out when mechanical energy is applied during kneading and by diffusion after filling with pressure. The reaction that occurs during kneading is such that the atoms of the alloy particles are dissolved in mercury and the dissolved portion absorbs mercury. This state is repeated by mechanical energy of diffusion and kneading, and a solid solution having a viscosity higher than that of pure silver is formed.

The mixing ratio of the metal powder to be kneaded and the mercury is not particularly limited, but a mixture ratio of about 5/8 can be used. If the amount of mercury is increased, the amount of residual mercury is increased but the viscosity is low. Therefore, it becomes difficult to form voids due to filling. When the spherical metal powder described above is used as the metal powder, the mixing ratio can be reduced to about 1 / 0.8.

The kneading time may be about 10 seconds by mechanical stirring. The amount of dimensional change of each metal is 32 μm / cm (24 H) for pure gold (Au), 279.0 μm / cm (24 H) for pure silver (Ag), and 3.3 μm / cm (24 H) for pure copper (Cu), compressive strength, pure gold (Au) in 23.6kgf / mm ² (48H), in 15.2kgf / mm ² in pure silver (Ag) (48H), pure copper (Cu) in 10.8kgf / mm ² (48H) is there.

Since amalgam is kneaded with metallic mercury, there is concern about toxicity. It is known that mercury becomes tissue-friendly when it is organized and is toxic when orally administered. However, although 100 years have passed since the development of amalgam (generally, tin amalgam has been used) as a filling material for the dental field used in the oral cavity, no mercury poisoning has occurred. Therefore, there is no danger with regard to the toxicity of the produced metal products. Further, at present, a method has been developed in which a kneaded product can be obtained from measurement to kneading without touching mercury, so there is no danger in the manufacturing process.

The present invention described above may be implemented in any manner as long as the configuration thereof is not changed, and may be used in combination with a known method. For example, the above-mentioned Japanese Patent Laid-Open No. 2-1
The method described in Japanese Patent No. 85205 and the method described in Japanese Patent Application (Reference No. 11900027) filed on October 29, 1991 may be used in combination with one or both of them.

When a gold alloy jewel is manufactured by combining the method of the present invention and the method described in Japanese Patent Laid-Open No. 185205/1990, a precast part and a mounting frame material are fixed in a mold cavity, After casting into the mold cavity, the mounting portion (inside the mounting frame member) may be filled with amalgam. The product thus obtained is integrally incorporated into the cast gold alloy, and the amalgam material which is trimmed into the mounting frame material is also integrally incorporated.

When a gold alloy jewelery is manufactured by combining the present invention and the method described in the patent application (reference number 11900027) filed on October 29, 1991, a weir and a mounting frame are attached to a wax model. The material may be fixed to form a mold cavity, different gold alloy melts may be cast into the chambers formed in the mold cavity, and then the mounting portion (in the mounting frame material) may be filled with amalgam. Both the weir and the mounting frame material described above may be made of platinum alloy plates. The product thus obtained is one in which gold alloys having different colors are integrated, and the amalgam material which is framed in the mounting frame material is also integrated.

[0025]

EXAMPLES Examples of the present invention are shown below.

Example 1 In the lost wax method, five holes having a diameter of 3 mm and a depth of 2 mm were formed in a ring-shaped wax model. And
A 0.15 mm-thick pipe made of a platinum alloy was inserted as a mounting frame material into each hole to mold a mold (cavity). Next, to produce a casting by casting a dark red gold alloy of Au ⁷⁵ -Cu ^25, it was polished the casting. After that, when each pipe integrated with the casting was filled with pure gold amalgam and polished, a red metal (= cast metal part) with a white circle border (= pipe part) was golden (= amalgam). A ring having the composition (partial) was produced. Pure gold amalgam is a mixture of pure gold powder having a particle size of 1 to 15 μm and mercury.
The mixture kneaded at a ratio of 0.8 was used and filled at a pressure of 1 to 2 kgf.

Example 2 In the lost wax method, a mold (cavity) was formed by fixing a sack mold made of a platinum alloy plate having a thickness of 0.15 mm as a mounting frame member to a wide ring-shaped wax model. ..
In addition, the above-mentioned wooden frame is molded so that the bottom surface has a leaf shape. Next, a casting produced by casting the white gold alloy of Au ⁷⁵ -Ni ¹⁵ -Cu ^10, was polished the casting. After that, when the same pure gold amalgam as that used in Example 1 was filled in a stencil form integrated with the cast body and polished, a white background (= cast metal part) had a golden leaf pattern (= A ring having the composition (amalgam part) was produced.

Example 3 In the lost wax method, a mold having a diameter of 2 mmφ and a depth of 3 mm was opened in a wide ring-shaped wax model to form a mold (cavity). Next, a platinum alloy was cast into a cast body, and the cast body was polished. After that, when the holes formed in the cast body were filled with the same pure gold amalgam as that used in Example 1 and polished, a ring in which a round pattern of pure gold was formed around the platinum color (= cast metal part) Was manufactured.

Example 4 Height of 15 cm and diameter of 8 cm in the lost wax method
A cylindrical wax model with a thickness of 0.1
A mold frame made of a 5 mm platinum alloy plate was fixed and a mold (cavity) was formed. In addition, the above-mentioned wooden frame is molded so that the bottom surface has a bird shape. Next, Cu ⁸⁴ -P
by casting a b ⁸ -Zn ⁷ -Sn ¹ of the copper alloy to produce a cast body which is flame-like red alloy cylindrical object was polished the casting. After that, silver amalgam was filled in a stencil frame integrated with the cast body, and polishing was performed to obtain an art craft. still,
The silver amalgam was prepared by kneading silver powder having a particle size of 1 to 15 μm and mercury at a ratio of 1: 1 and was filled at a pressure of 1 to 2 kgf.

[0030]

As described above, the metal product of the present invention is one in which an amalgam material and a cast body are integrated, and a plurality of colors can be obtained by selecting an amalgam material having a different color / tone from the cast body. A metal product having a color tone can be obtained, and the degree of freedom in design becomes extremely large.

A manufacturing method in which a mounting frame material that does not promote amalgamation is fixed in a mold cavity in the lost wax method and casting is performed, and the amalgam is filled into the mounting frame material of the obtained cast body. Can extremely easily produce the above metal product. That is, the above-mentioned method can produce a cast body in which the mounting frame material is integrated, almost in the same manner as the usual lost wax method, and at that time, no troublesome labor and steps are added. Further, the filling of amalgam can be performed very easily. Further, although the obtained jewelry has a plurality of colors and color tones, in addition to that, the mounting frame material plays a role in the design and the creativity of the design, and the degree of freedom of the design becomes extremely large.

Further, since the above-mentioned manufacturing method does not change the steps of the usual lost wax method or add troublesome labor and steps, it can be carried out in combination with various manufacturing methods. For example, the production method of the present invention is described in JP-A-2-
No. 185205, October 29, 1991
By carrying out the method in combination with the method described in the Japanese patent application (Reference No. 11900027) filed daily, the degree of freedom in design can be dramatically expanded, and a product with more colorful colors can be manufactured.

Claims (2)

[Claims] 1. A casting is integrally provided with a mounting portion containing one or more of platinum, palladium, iron, cobalt, nickel, chromium and manganese to prevent amalgamation, and the mounting portion is filled with amalgam. Metal products characterized by that. 2. A casting frame is cast by fixing a mounting frame material containing at least one of platinum, palladium, iron, cobalt, nickel, chromium and manganese, which does not promote amalgamation, in the mold cavity in the lost wax method. A method for producing a metal product, characterized in that an amalgam is filled inside the mounting frame material of the obtained cast body.