JP2012035304A - Method for manufacturing jewelry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing jewelry with high decorative effect by easily bonding metals having different melting points.SOLUTION: The method for manufacturing jewelry characterized by bonding metals with different melting points includes the following processes (1)-(5). (1) A process for manufacturing a model for casting by putting (applying) a paste which can be burned out in an investment material in a desired shape and thickness on the whole or a part of a surface of the metal A having an optional shape. (2) A process for mounting a spur to a paste part of the model for casting. (3) A process for burning out the paste after burying and hardening the casting model with the spur in the investment material. (4) A process for casting by pouring the metal B with a melting point lower than that of the metal A into a space generated by the burning-out for bonding both the metals. (5) A process for taking out a cast from the investment material and finishing the cast.

Description

  The present invention relates to a jewelery manufacturing method in which metals having different melting points are bonded to each other. More specifically, a metal having a low melting point is fused (cast) to the surface of a metal body having a high melting point, and the decorative effect of the jewelery is improved. In addition to further increasing the cost, manufacturing costs and material costs will be significantly reduced.

Conventionally, a plaster mold method is known as a convenient manufacturing method for manufacturing a plurality of precious metal jewelry pieces having the same shape. This generally goes through the following steps (1) to (6).
(1) An expert (artisan) makes a precious metal original (for example, one made of silver) intended for production by hand.
(2) The original form made of noble metal is taken as a (silicon) rubber mold (concave).
(3) The wax is poured into this mold to change the original form made of the noble metal into the original form (convex form) made of wax.
(4) After burying this wax original form in investment material (main component is gypsum paste) and curing the investment material, the wax part is incinerated by heating in an electric furnace.
(5) Cast jewelry by pouring precious metal into the original space (concave) created by incineration.
(6) Further fine processing is performed on the cast jewelry.

JP 09-232542 JP 05-228609 A JP-A-2005-319474

Casting products (products) exhibiting complex shapes can be efficiently manufactured by the plaster mold method, but this is further combined with combination casting (bonding of different metals). Conventionally, for example, the following method has been used to enhance the decorative effect by applying gloss and shine (mirror surface) different from those of the above and drawing characters.
(A) Cut ring, pressure bonding method For example, two rings with different metal types extracted by a press are sandwiched between pressure molds and joined by applying heat and pressure.
However, this method requires the use of a mold, so that the mold cost is large and suitable for mass production, but is not suitable for a large variety of small lots of different sizes.
(B) Brazing (brazing) method For example, in order to lower the melting point of brazing materials such as two rings or parts of different metal types cast separately or brazing materials (silver brazing, 14 gold brazing, 10 gold brazing, etc.) In addition, it is a method of welding and joining with a low-grade gold material).
However, since this method uses a brazing material, there is a defect that the color of the brazing material appears at the joining portion (generation of a nest (a portion where gas has accumulated) called a low nest).
Moreover, since the quality of the metal of the brazing material is low, the quality is deteriorated depending on the amount used (for example, when gold is less than 75%).

  As a result of intensive efforts to develop a combination casting method that can be applied to various varieties and small lots adapted to the future era, the inventor, for example, to the parts cast by the plaster mold method again, the parts The present invention has been completed by knowing that the above-mentioned drawbacks can be eliminated by applying a casting process using a metal having a lower melting point.

The present invention is constituted by the following claims 1 to 11.
<Claim 1> A method for producing a jewelery characterized in that metals having different melting points are bonded to each other by the following steps (a) to (e).
(B) A process for producing a casting model by depositing (applying) paste that can be incinerated in investment material to a desired shape and thickness on all or part of the surface of metal A having an arbitrary shape ( (B) A step of attaching a spool to the paste portion of the casting model (c) A step of incinerating the paste after the casting model with a spool is buried in an investment agent and hardened (2) In a space generated by the incineration, Casting by pouring metal B having a melting point lower than that of metal A, and bonding both metals (e) Step of taking out the casting from the investment agent and finishing <Claim 2> The portion where the paste on the surface of metal A is piled up, The method for producing a jewelry according to claim 1, wherein the jewelry has a concave shape (recessed portion) or a cutout shape having an L-shaped cross section.
<Claim 3> The method for manufacturing a jewelery according to claim 2, wherein the recesses on which the paste on the surface of the metal A is piled up are integrally formed.
<Claim 4> In the case where the recesses of claim 3 exist independently of each other, a communication (penetration) through hole is formed in the side wall separating the recesses, so that the recesses communicate with each other. Jewelery manufacturing method.
<Claim 5> The method for producing a jewelry according to claims 2 to 4, wherein the dents on which the paste on the surface of the metal A is piled up expresses characters.
<Claim 6> The method for producing a jewelry according to any one of claims 1 to 5, wherein the metal A is cast by a plaster mold method.
<Claim 7> The method for producing a jewelry according to any one of claims 1 to 5, wherein the paste is wax.
<Claim 8> The method for producing a jewelry according to any one of claims 1 to 7, wherein a difference in melting point between metal A and metal B is 5 to 800C.
<Claim 9> The method for producing a jewelry according to any one of claims 1 to 8, wherein a temperature at which the metal B is poured and cast is 100 to 200 ° C higher than a melting point of the metal B.
<Claim 10> The method for producing a jewelry according to any one of claims 1 to 9, wherein the metal A and the metal B are an alloy having the following composition.
Metal A: Pt900 alloy Metal B: K18 (pink) alloy or K18 (yellow) alloy <Claim 11> Metal A and metal B are alloys having the following compositions. Jewelery manufacturing method.
Metal A: K18 (white) or K18 (yellow) alloy Metal B: K18 (pink) alloy

  The reason why the present invention is configured as described above is that a metal A having a high melting point is filled with a paste that can be incinerated in an investment material to form a space, and a metal B having a melting point lower than that of the metal A is formed in the space. When casting under certain conditions, both metals can be firmly bonded together, and combination processing (gathering different metals to give gloss and shine (specularity) different from the cast product of the main body, This is because it is possible to draw jewelry and the like having a large decorative effect and can be manufactured very easily as compared with existing methods.

The two types of metal bonding methods according to the present invention seem to be easily possible in the past, and actually cause poor adhesion, rough skin, cracks, etc., and enable a technique that was inevitably impossible. It provides a bonding method that does not have brazing and cannot be performed by laser welding.
According to the present invention, it can be easily applied to joining of piercing metal fittings, joining of moving parts of bent piercings, and the like.

It is a figure which shows the outline of the manufacturing method of the jewelry of this invention. It is a figure which shows the ring main body in which the character "AMORE" is formed in the metal A as a hollow (concave). It is a figure which piles up wax on the ring main part (application | coating). It is a figure which shows the state which attached the spool. It is a figure which shows the state which raised the tree. It is the ring obtained by Example 1 (metal A: Pt900, metal B: K18 (pink)). It is a ring obtained by Example 2 (metal A: Pt900, metal B: K18 (yellow)). It is a ring obtained by Example 3 (metal A: K18 (white), metal B: K18 (pink)). It is a ring obtained by Example 4 (metal A: K18 (yellow), metal B: K18 (pink)). It is a front view of a ring for explanation. It is an aa sectional view of a ring for explanation. It is a bb sectional view of an explanation ring.

  The method for manufacturing a jewelry according to the present invention is generally performed as shown in FIG.

Examples of the metal A or metal B used in the present invention include the following alloys. However, it is not restricted to these examples.
(A) Pt900
Approximate composition: Pt 90%, Pd 10%
Melting point: 1760 ° C
Normal casting (casting) temperature: 1820 ° C
(B) Pt950
Approximate composition: Pt 95%, Pd 5%
Melting point: 1770 ° C
Normal casting (casting) temperature: 1830 ° C
(C) Pt585
Approximate composition: Pt 58.5%, Pd 41.5%
Melting point: 1600 ° C
Normal casting (casting) temperature: 1700 ° C
(D) K18 (yellow)
Approximate composition: Au 75%, Ag 15%, Cu
10%
Melting point: 950 ° C
Normal casting (casting) temperature: 1100 ° C
(E) K18 (pink)
Approximate composition: Au 75%, Ag 5%, Cu
18%, Pd 2%
Melting point: 930 ° C
Normal casting (casting) temperature: 1090 ° C
(F) K18 (white)
Approximate composition: Au 75%, Ag 4%, Cu 5%, Pd
15%, In 1%
Melting point: 1180 ° C
Normal casting (casting) temperature: 1300 ° C

Two types can be appropriately selected from these examples of alloys, and one having a high melting point can be used as a metal A, and one having a low melting point can be used as a metal B for casting. The selection of the metal A and the metal B can be arbitrarily selected as long as there is a difference between the melting points of the two.
Also, the amount (weight or volume) of both may be greater or smaller.

The part where the paste on the surface of the metal A is stacked preferably has a dent (concave shape). This is because, in particular, when characters are drawn, it is necessary for the metal B to spread uniformly in a narrow space. For the same reason, it is preferable that the dents are formed in a series (lumps) because the metal B flows uniformly into the dents of the entire character, and poor filling and separation are unlikely to occur. In order to form a recess (for example, two or more characters) in a series (a lump), cut out a part of the side wall of the recess forming the character or form a continuous (through) through hole in the side wall. That's fine.
This will be described with reference to FIGS. 10 to 12. The character portion of “A MORE” is formed with a dent (concave shape), and the portion of “MORE” is one or two places (the portion where the character is in contact). They are connected together by a notch. Since the letters “A” and “M” are connected by the communication hole 2 in the side wall, the entire “A MORE” is also connected in series.
Also, when the paste is piled up along the peripheral surface (one circle or part) of the ring (metal A), a concave groove is provided in the peripheral surface of the ring or the cross section is L-shaped on the peripheral surface It is preferable to provide the cutout in the shape of a band.
By configuring as described above, the metal B is uniformly diffused into the space around the metal A, and then the temperature decreases and contracts to reduce the volume.
As a result, the metal B can be firmly bonded to the recess or the L-shaped notch of the metal A.

  In the present invention, the paste that can be incinerated in the investment material refers to an incinerated substance that is used in the plaster mold method (lost wax method) to form an original space in the investment material. Specifically, vegetable and animal wax esters, paraffinic wax obtained from petroleum, silicon rubber, ceramic wax, synthetic resin (epoxy acrylate, urethane acrylate, ultraviolet curable resin), and the like.

In order to deposit (apply) a paste (wax) on the surface of metal A (metal), the metal A is lightly warmed by the heat of an alcohol lamp (around 70 ° C.), the paste is also melted, and the paste is poured into the bonded portion. Adhering to the metal, the adhesive surface is closely integrated with the metal with a heated spatula. The adhesive surface is preliminarily filed and cleaned with an ultrasonic cleaner or the like to remove dirt.
More specifically, the protruding portion of the paste is shaved with a spatula, and the excess portion is removed and shaped. At this time, leave a little more wax in consideration of the margin to cut when it becomes bullion.
In addition, when the wax begins to melt during incineration, a stopper is attached so that the position of the metal body does not move (when the wax burns and the mold becomes hollow, casting of a ring or the like supported by the wax) Since the position of the product moves in the mold, the protrusion is made of the same metal to be supported by the investment material).

Next, in consideration of the shape, thickness, etc. of the portion to which the metal A paste is applied (the portion where the metal B will flow later), a spool (inlet for metal flow) and a sprue spool below it (see FIG. 4). FIG. 5). For the spool, normal wax (Matsukaze Line Wax 25R, Matsukaze Line Wax 40R, company name: Matsukaze Co., Ltd.) is used.
Then, with a spatula heated to about 100 ° C. with an alcohol lamp, the bottom of the sprue spool is melted and placed on the frusto-conical truncated cone to stand a tree (FIG. 5). This tree is set in a flask (iron outer frame container).

The investment material is poured into the flask and the tree is embedded in the investment material.
For example, the investment material is sold under the trade name “Gift” (manufactured by Noritake Company (main component Cristobalite)) and mixed for about 5 minutes at a mixed water ratio of around 40% (37% to 42%). Since air has entered when mixed, the air is used with a defoaming machine (manufactured by Yasui Intertech Co., Ltd.).
After pouring investment, dry for about 1 hour.

  Incineration of the paste (wax) involves heating the flask in an electric furnace. The incineration conditions are usually heated at about 100 ° C. per hour and held at 720 ° C. to 750 ° C. for about 1 hour.

For casting, for example, a vacuum pressure casting machine manufactured by Nidec High Frequency Co., Ltd. is used.
Temperature setting is important for casting. The set temperature in the present application means the following temperature.
* Electric furnace temperature: Mold temperature * Casting temperature (casting temperature): The temperature of the poured metal (metal B) * Melting point: The temperature at which the metal begins to melt (not the casting temperature)

The temperature at which the metal B of the present invention is cast and cast (the temperature necessary for the metal B to completely flow into the mold) is usually 100 ° C. to 200 ° C. higher than the melting point of the metal B. This is because if the casting is performed in the vicinity of the melting point of the metal B, solidification starts immediately, and there is a possibility that poor filling of the space may occur.
The temperature at which the metal B is cast and cast may be considerably higher than the melting point of the metal A, but when the metal B may be dissolved by the metal B, the mold temperature is lowered to cope with it.
The mold temperature is usually 700 ° C to 800 ° C.

After completion of casting, acid treatment is performed to remove surface oxides, and the casting is cut from the tree with a nipper and separated.
File the casting, shape it using a silicon point, paper, etc. with a luter, finish it with a rotating buff, polish it, wash it, and wash it into a finished product (product).
Next, in the following embodiments, a ring manufacturing method will be described as an example. However, the present invention is not limited to the ring manufacturing method, and can be applied to jewelry in general.

<Production of ring with letter>
(A) Use Pt900 (melting point 1760 ° C) for metal A, and place a ring in a state where the letters “AMORE” can be seen on the surface (shape where the letters “AMORE” are formed in a concave shape on the surface) Used by casting by the method (see FIG. 2).
The character part “AMORE” on the surface of the metal A forms a continuous through hole (not visible in the figure) on the side walls of the letter “A” and the letter “M”, and the part “MORE” Part of the side wall of each character is cut into a lump, the entire "AMORE" is a lump and continuous (bonded) shape, and the metal B flows evenly throughout the "AMORE" so that poor filling is unlikely to occur Once formed, the metal B flows into the shape that does not peel from the metal A even if the metal contracts or deforms.
(B) K18 (pink) (melting point 930 ° C.) was used for metal B.
(C) Aqua wax (melting point 80 ° C, manufactured by FREEMAN Mfg. & Supply Co.) was poured into the surface of metal A (logo recess) and shaped using a spatula to prevent air from entering (see Fig. 3). ). The thickness of the wax was 0.2 mm to 3.0 mm.
(D) The casting was performed at a mold temperature of 730 ° C. and a casting temperature of 1120 ° C.
The finished product is shown in FIG.

<Center line ring>
(A) Pt900 was used for metal A, and a ring having a circle and a recess formed in the center of the outer periphery was cast in advance by a plaster mold method. The recess formed in the outer peripheral surface was in a state where the cross section connecting the peripheral surface and the center was recessed into a rectangle of 1.0 mm × 2.0 mm. The cross section of the recess was not limited to a quadrangle, and the same result was obtained for an inverted triangle, U-shape, and the like.
(B) For metal B, K18 (yellow) was used.
(C) Aqua wax (melting point 80 ° C., manufactured by FREEMAN Mfg. & Supply Co.) was poured into the recesses on the surface of the metal A, and shaped using a spatula. The wax thickness was about 1.2 mm.
(D) Casting was performed at a mold temperature of 730 ° C. and a casting temperature of 1130 ° C.
The finished product is shown in FIG.

<Half line ring>
(A) K18 (white) was used for metal A, and a ring in which a ring was formed in a circle on the outer periphery and a notch portion having a L-shaped cross section was cast in advance by a plaster mold method.
(B) For metal B, K18 (pink) was used.
(C) Aqua wax (melting point 80 ° C., manufactured by FREEMAN Mfg. & Supply Co.) was poured into the L-shaped notch of metal A, and shaped using a spatula. The wax thickness was about 1.2 mm.
(D) The casting was performed at a mold temperature of 730 ° C. and a casting temperature of 1120 ° C.
The finished product is shown in FIG.

<Hiranai ring left and right combination>
(A) K18 (yellow) was used for metal A, and a ring in which a notch portion having a band shape and an L-shaped cross section was formed in advance on the outer circumference by a plaster mold method was used.
(B) For metal B, K18 (pink) was used.
(C) Aqua wax (melting point: 80 ° C., manufactured by FREEMAN Mfg. & Supply Co.) was poured into the surface of metal A (recessed portion of the logo), and shaped using a spatula. The thickness of the wax was about 0.2 mm to 1.2 mm.
(D) Casting was performed at a mold temperature of 650 ° C. and a casting temperature of 1120 ° C.
The finished product is shown in FIG.

The two types of metal casting / bonding methods according to the present invention provide a bonding method that is not brazed and cannot be performed by laser welding, and can be used in the jewelry manufacturing industry.
This method can be easily and easily applied to joining of metal fittings, joining of moving parts of bent pierced earrings, etc., and is expected to become a very common casting method in the future.

1. Ring 2. Continuous hole

Claims (11)

A method for producing a jewelery comprising bonding metals having different melting points by the following steps (a) to (e).
(A) A process for producing a casting model by placing (applying) a paste that can be incinerated in an investment material in a desired shape and thickness on all or part of the surface of the metal A having an arbitrary shape ( (B) A step of attaching a spool to the paste portion of the casting model (c) A step of incinerating the paste after the casting model with a spool is buried in an investment agent and hardened (2) In a space generated by the incineration, A process of pouring and casting a metal B having a melting point lower than that of the metal A, and bonding both metals (e) A process of taking out a cast product from the investment and finishing it The method for producing a jewelery according to claim 1, wherein the portion where the paste on the surface of the metal A is deposited has a concave shape (recessed portion) or a cutout shape having an L-shaped cross section. The method for producing a jewelery according to claim 2, wherein the dents on which the paste on the surface of the metal A is accumulated are integrally formed. 4. The method for producing a jewelry according to claim 3, wherein, when the recesses of claim 3 exist independently of each other, a continuous (through) through hole is formed in a side wall separating the recesses so that the recesses communicate with each other. . The method for producing a jewelery according to claims 2 to 4, wherein the dents on which the paste on the surface of the metal A is piled up represent characters. The method for producing a jewelry according to any one of claims 1 to 5, wherein the metal A is cast by a plaster mold method. The method for producing a jewelry according to any one of claims 1 to 5, wherein the paste is a wax. The method for producing a jewelry according to any one of claims 1 to 7, wherein a difference in melting point between the metal A and the metal B is 5 ° C to 800 ° C. The method for producing a jewelry according to any one of claims 1 to 8, wherein a temperature at which the metal B is cast and cast is 100 ° C to 200 ° C higher than a melting point of the metal B. The method for producing a jewelry according to claim 1, wherein the metal A and the metal B are alloys having the following composition.
Metal A: Pt900 alloy Metal B: K18 (pink) alloy or K18 (yellow) alloy The method for producing a jewelry according to claim 1, wherein the metal A and the metal B are alloys having the following composition.
Metal A: K18 (white) or K18 (yellow) alloy Metal B: K18 (pink) alloy