JPS5847253B2 - How to find a single source - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of obtaining a metal prototype necessary for manufacturing jewelry by casting, and in particular, a method for obtaining a metal prototype that is thin and three-dimensional with a desired thickness. In other words, a thick mold with the same dimensions as the finished product is formed using a low melting point alloy, the entire circumference of this thick mold is coated with an alkaline preparation, and then a release layer is formed on unnecessary parts. This manufacturing method is characterized by forming an electroformed layer by electroforming copper until it reaches a predetermined thickness, and then melting the original thick mold by heating to form a copper metal mold.

Jewelry made of platinum, gold, white gold, silver, etc. is produced in the following process.

Prototype → Rubber body female mold → Wax mold, immersion/firing (mold) → Precious metal melt injection filling (centrifugal method) → Precious metal item removal.

Here, the first prototype is traditionally made by hand from metal such as silver, gold, platinum, etc., and is slightly thicker than the finished product (0.5 mm thicker than the finished product) in anticipation of shrinkage due to casting.
．． It is manufactured to a thickness of about 4m (about 4m thick).

In addition, it is desirable for accessories to be lightweight, durable, and give a sense of weight in terms of appearance.To achieve this, it is necessary to make thin prototypes as long as it does not interfere with casting. Something with a pattern is desired.

However, using the traditional method of hand-making, it is extremely difficult to make the overall thickness average, thin, and three-dimensional, and requires extreme skill.

Another method is to make a three-dimensional mold using a thin wax plate, then cast it in metal, modify it, and use it as a prototype, but this method requires skill in handling the thin wax plate and is difficult to produce with an average thickness. In practice, this is hardly ever done.

This invention eliminates these drawbacks of the conventional method at once. Next, one embodiment will be described in detail with reference to the drawings. First, as shown in FIG. 1, low melting alloys such as tin and zinc are Make a solid cross-shaped original thickness mold 1 with the same dimensions as the finished product (Fig. 3a), attach the lead wire 2 to the back side, and plate this original thickness mold 1 with an alkaline solution of 1■ for 30 minutes to coat the whole. Cover with copper film 3 (FIG. 3b).

This copper film 3 protects the original thick mold 1 from being attacked during subsequent electroforming.

Next, as shown in Fig. 2, unnecessary areas on the back side of the thick mold 1 are painted with acid-resistant paint, and completely dried to form a peeling layer 4 of insulating film (Fig. 3C). Approximately 0.6V,
Electroforming is carried out for about 6 hours to form an electroformed layer 5 having a thickness of 0.4 mm (FIG. 3d).

At this time, in order to electroform uniformly, a rotating device is used,
It is rotated 10 times per minute to form a dense electroformed layer 5 with a low current.

After electroforming, when heated at approximately 500°C, the original thick mold 1, which is a low melting point alloy, is melted and removed, and at the same time, the copper film 3 also collapses, leaving the copper plate part that is the electroforming layer 5, and unnecessary parts are removed. It was made into a hollow shape, and a copper prototype was obtained (Fig. 3 eL).The entire surface was sanded, and the back surface was reinforced and corrected to complete the process.

In addition, if necessary, the copper plate portion may be processed or modified by waxing or soldering, etc., and may be used as a prototype.

Next, the other side having a three-dimensional pattern and shape will be explained with reference to FIG. After that, take it out, take the plaster mold 9 as a reference material at the same time, put the wax mold 8 into the investment material 10, and bake it, the part will melt. The low melting point metal 1 is absorbed into the casting mold made of investment material.
' is injected and filled to form a 0-element prototype 1, f is corrected and a lead wire 2 is attached, and the electroforming process is performed in the same way as the cross-shaped original thick mold described above to obtain a g-hollow-shaped prototype 5. be.

In this way, since this invention uses a low melting point alloy as the original thick mold, it is soft and easy to process, allowing the creation of complex shapes and three-dimensional shapes. If it is necessary to do so, you can reduce the overall thickness evenly by soaking it in acid, and since it can be soldered, it is also possible to partially tighten the copper plate to make it thicker, and after electroforming, the original thickness can be reduced. The mold can be removed very easily.

In addition, since the original thick type is made to the same dimensions as the finished product, there is no need to make it slightly larger than the finished product as with conventional products, and it is easy to make once you have a certain level of craftsmanship. It can be manufactured in

Furthermore, since the original thick mold is coated with an alkaline rust solution, there is no risk of destroying the original thick mold even if electroforming is performed using an acidic solution.

Further, by simply forming a release layer, unnecessary portions can be easily removed and a thin prototype can be obtained.

Furthermore, since copper is electroformed to form an electroformed layer, and this electroformed layer is used as a prototype, the desired thickness can be obtained by adjusting conditions such as liquid concentration, voltage, temperature, and time during electroforming. It is possible to obtain a prototype, which is convenient for shrinkage during future casting,
Since it is a copper metal type, it can be brazed, added, and processed effectively, and it is also possible to form an edge F as shown in Fig. 3e, making it thin but sturdy and giving a sense of weight. It is something that can be produced.

[Brief explanation of the drawing]

The figures show a method of manufacturing a prototype according to the present invention, and FIG. 1 is a slope view of a base mold according to an embodiment, and FIG. 2 is a slope view from the back side of a base mold with a carrier layer formed thereon. FIG. 3 is a process diagram for manufacturing the original mold, and FIG. 4 is a process diagram for manufacturing the other thick die. DESCRIPTION OF SYMBOLS 1... Original thick type, 3... Copper film, 4... Peeling layer, 5...
...Electroformed layer.

Claims (1)

[Claims] 1 Form a thick mold with the same dimensions as the finished product using a low melting point alloy, coat the entire circumference of this thick mold with an alkaline solution, then form a peeling layer on unnecessary parts, and coat copper to a specified thickness. 1. A method for producing a mold for casting accessories, characterized in that an electroformed layer is formed by electroforming until reaching , and then heated to melt the original thick mold to form a copper metal mold.