JPS60141363A - Production of multi-layer base metal - Google Patents

Abstract

PURPOSE:To improve appearance and to eliminate thoroughly exfoliation of respective layers after production by laminating and uniting plural noble metals by a casting method without using welding, etc. thereby making the boundaries between the respective layers distinct. CONSTITUTION:A molten metal for the 1st layer is cast into a casting mold d1 formed by using a prototype b1 for the 1st layer to form a base metal a1 for the 1st layer. Only the prototype b2 is removed from a rubber mold e2 formed by attaching the base metal a1 to the prototype b2 for the 2nd layer, thus manufacturing a casting mold d2. A molten metal for the 2nd layer is cast into the mold d2 to form a base metal a2 for the 2nd layer united to the base metal a1. A base metal a3 for the 3rd layer fitted tightly and united to the base metals a1, a2 of the 1st layer and the 2nd layer is thereafter formed similarly until finally a multi-layered base metal A is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a multilayer base metal in which platinum, white gold, and alloys of gold, silver, copper, etc. are integrally formed in multiple layers.

This multi-layer metal has a decorative effect due to the different color tones of the precious metals that make up each layer, and is mainly processed into jewelry.

Conventionally, when manufacturing this type of ingot, each layer was formed separately using the required noble metal, and the layers were laminated together by welding, brazing, etc. to form a block. As a result, the welded layers and brazing layers that integrate each layer are exposed and give a bad appearance (which reduces the product value), and the multilayer base metal manufactured by laminating and integrating each layer in a curved shape has a bad appearance. It was almost impossible to roll it.

In view of the shortcomings of the conventional method, the present invention integrates each layer by a casting method without using welding or brazing, thereby creating a multi-layer metal with good appearance and high commercial value.
In addition, it is an object of the present invention to provide a method for manufacturing a multilayer metal ingot, in which each layer can be laminated and integrated in a curved shape as well as in a straight line, and the manufactured multilayer metal can be rolled.

The method of the present invention that achieves the above object consists of configuring each pattern forming each layer so that each layer can be separated, forming a mold using the pattern for the first layer, and casting molten metal for the first layer into this mold. Form the first layer base metal, then attach the first layer base metal to the second layer prototype to make a rubber mold, and extract only the second layer prototype from this rubber mold. Make a mold and put the second mold into this mold.
Molten metal for the layer is cast to form a second layer base metal that is integrated with the first layer base metal, and the base metal formed in the previous process is attached to the next prototype in the same manner. This method is characterized by making a rubber mold, extracting only the original form from the rubber mold to make a mold, and pouring the next molten metal into this mold to integrate it with the base metal formed in the previous process. It is.

Although the illustrated embodiment shows a case where a multi-layer ingot is made of three layers (three colors), it will be easily understood from the following explanation that it can be made with four, five or more layers. It will be.

In addition, although the illustrated embodiment shows the case of producing a multilayer base metal (Fig. 1) in which each layer is laminated and integrated in a straight line, it is possible to manufacture a multilayer base metal in which each layer is laminated and integrated in a curved shape as shown in Fig. 2. It will be easily understood from the following explanation that even gold can be manufactured using the same principle.

Hereinafter, an example of implementing the present invention will be explained based on the drawings in the order of manufacturing steps.

FIG. 1 is a perspective view of the manufactured multilayer metal (A), in which (a) is a white first layer made of, for example, platinum or white gold, and (al) is a white first layer made of, for example, an alloy of gold and silver. The yellow second layer (a3) is the red third layer made of, for example, an alloy of gold and copper.
) is also made of similar 3N (three colors), and is cut and shaped along the line shown by the imaginary line.

Figure 3 shows the prototype (
B) is a perspective view, in which (bz) is the first N prototype;
(bl) is the prototype for the second layer, (b3) is the prototype for the third layer,
Each of them is formed into a rectangular rod shape using a metal base metal, and each layer is assembled so as to be separable. In the figure (cz
) is the part that molds the injection port (1).

First, using the first layer prototype (bz), a mold (d
1) is made, and molten metal for the first layer is cast into this mold (dx) to form the base metal (al) for the first layer.

That is, as shown in FIG. 4, a rubber mold (el) is made of silicone rubber or the like using the first layer prototype (bl), and the rubber mold (
el) in half, pull out the first layer prototype (bi), overlap the rubber mold (ex) again, and make the first layer prototype (bz
) Pour wax into the cavity after removing the
A wax mold of the same shape as the layer pattern (bx) is made, then this wax mold is buried in plaster, and after the plaster solidifies, the internal wax mold is burned off in an electric furnace to create the mold ('dx).
(See Figure 5).

Then, molten metal for the first layer (platinum in the embodiment) is poured into the mold (dl) from the injection port (1) to form the base metal (ax) for the first layer.

Next, as shown in FIG. 6, the first layer base metal (al) previously formed is attached to the second layer pattern (bl) at the exact position of the pattern (B), and the rubber mold (el) is attached. )make. At that time, the first
The inlet part of the base metal (ax) of the layer is removed, and
The part where the injection port is formed on the second layer master mold (bl) (cz)
Install. Then, this rubber mold (el) is cut in half, only the second layer master mold (bl) is extracted, and the rubber mold (el) is removed again.
), and after removing the second layer prototype (bl), wax is poured into the cavity to form the first layer base metal (aluminum).
) and make a wax mold that is in close contact with it. At this time, the first layer base metal (aluminum) is heated to 100 to 150°C to improve adhesion with the injected wax. Next, this wax mold is buried in plaster, and after the plaster solidifies, the internal wax mold is burned off in an electric furnace to create a casting mold (dz) (see Figure 7).

Then, the molten metal for the second layer (in the example, an alloy of gold and silver) is poured into the mold (dz) from the injection port (1), and the second layer is poured into the mold (dz).
The 2Nth base metal (ax) that is closely integrated with the base metal (ax) of the layer
form al).

When forming the final third layer of metal (a3), the third layer is formed in the same way as when forming the second layer of metal (al).
The second layer base metal (al), which is closely integrated with the first layer base metal (al), is attached to the layer base metal (b3) at the position shown in the base shape (B), and the rubber mold ( e3) (see Figure 8).

Then, from this rubber mold (e3), the master mold for the third layer (b,)
A wax mold is made by extracting the chisel, a mold (d3) is made from this wax mold (see Figure 9), and molten metal (gold and copper alloy in the example) for the third layer is poured from the injection port (1). is cast to create the first and second layer bullion (ax) (az
), form the third layer of base metal (a3) that is tightly integrated with A multilayer metal ingot (A) as shown in Figure 1 is completed.

Since the present invention manufactures a multi-layer ingot in this manner, a multi-layer ingot with good appearance and high commercial value, with no bonding layer (material) between each layer and clear boundaries between the layers, can be obtained. At the same time, it is also possible to easily manufacture products in which each layer is laminated not only in a straight line but also in a curved shape.

Moreover, since each layer is laminated and integrated by casting, there is no risk of each layer peeling off or separating after manufacturing, and rolling processing is also possible.

Therefore, the intended purpose can be achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the manufacturing method according to the present invention, FIG. 1 is a perspective view showing one embodiment of the manufactured multilayer ingot, FIG. 2 is a front view showing another embodiment, and FIG. 3 is a perspective view of the prototype, FIG. 4 is a partially cutaway perspective view of a rubber mold forming the first layer, FIG. 5 is a partially cutaway perspective view of the same mold, and FIG. 6 is a partially cutaway perspective view of the same mold forming the second layer. Fig. 7 is a partially cutaway perspective view of the rubber mold, Fig. 8 is a partially cutaway perspective view of the rubber mold forming the third layer, and Fig. 9 is a partially cutaway perspective view of the same mold. Partial cutaway perspective view, No. 10
The figure is a front view of the base metal molded with the mold of FIG. 9. In the figure, (A) is multi-layered metal, (al) is first layer metal,
(al) is the second layer metal, (a3) is the third layer metal, (B) is the prototype, (bl) is the first layer prototype, (bl) is the second layer prototype, (b3) is the prototype for the third layer, (dz)
(dz) (d3) is the mold, (el) (e2) (
413) is a rubber type. Patent applicant Mitsuwa Maju Kogyo Co., Ltd.

Claims (1)

[Claims] The master molds forming each layer are configured to be separable for each layer, a mold is made using the first N master mold, and the molten metal for the first layer is poured into this mold to form the base metal of the first layer. Next, a rubber mold is made by attaching the first layer base metal to the second layer pattern, and a mold is made by removing only the second layer pattern from this rubber mold. molten metal is cast to form a second layer of base metal that is integrated with the first layer base metal, and the same process is repeated to attach the base metal formed in the previous process to the next prototype. Make a rubber mold, extract only the original form from the rubber mold, make a mold, pour the next molten metal into the mold, attach the base metal formed in the previous process to make a rubber mold, and make the rubber mold. A method for manufacturing a multi-layer metal ingot, which is characterized in that a mold is made by extracting only the prototype from the mold, and the next molten metal is poured into the mold to be integrated with the metal formed in the previous process.