KR20060027584A - Manufacturing method of empted jewelry - Google Patents

Abstract

The present invention relates to a method for producing a hollow precious metal, the first step of forming the same primary model and the outer appearance of the product, and by applying wax to the outside of the primary model to cure the wax from the primary model 2 steps to separate and obtain the first top and bottom wax model, 3 steps to produce the second top and bottom model through gypsum work, lost wax and casting process from the first top and bottom wax model, and the second phase Four steps of manufacturing a rubber mold from the lower model, and a second step of manufacturing a second upper and lower wax model by solidifying and discharging wax after injecting the wax into the rubber mold, and the second upper and lower wax models are joined. 6 steps, and 7 steps of plastering the bonded hollow wax model, and 8 steps to produce a hollow precious metal casting through the casting process therefrom. As characterized in that it consists of nine steps to finish the surface of the hollow precious metal casting, the present invention can be produced in large quantities using various kinds of precious metal materials, including pure gold regardless of the shape of the hollow precious metal products, as well as the existing It is especially suitable for producing large quantities of precious metals with various design characteristics because the production cost is greatly reduced due to no need for facilities such as molds or presses compared to the forging process, and the production of product models is much easier and easier than the lost wax method. can do.

Description

Manufacturing method of hollow precious metals             

1 is a basic manufacturing process of the present invention

2 is a front view of the rubber frame

3 is a perspective view of a rubber frame;

<Explanation of symbols for the main parts of the drawings>

10; Rubber frame 11; Upper pressing plate 12; Lower pressure plate

13; Upper rubber plate 14; Lower rubber plates 21; Wax inlet

22; Internal model space 23; Indentation

The present invention relates to a method for casting a hollow (hollow) precious metal, and more particularly, a simple and bulk casting of a precious metal product in which the inside of the product is hollowed out from materials such as gold, silver, and copper, which are expensive metals. The purpose is to provide a way to

Conventionally, the method of manufacturing precious metals, which are filled with inside, that is, a cylinder, is generally made of a product model made of a soft and malleable material (usually silver), and a rubber mold is formed using this model. After injection, the same wax model as the product is extracted, a wax tree is formed to connect these wax figures, and then the wax tree is placed in a flask to bury the plaster to cure. When the hardened gypsum is heated to melt and remove the wax, the gypsum mold is completed. The molten metal is poured in accordance with the casting temperature, and the gypsum mold is placed in cold water, leaving only precious metal products. This method is called lost wax casting and is the most common precious metals manufacturing process.

On the other hand, hollow hollow precious metals such as margot buttons, hanbok soothers, or heart or ball shaped precious metals are too difficult to wear or too expensive to be manufactured in the case of the same type. For the purpose of emptying the interior, the precious metal is divided in half to make it fine and three-dimensional, and then the two halves are combined with gold soldering. For example, the production method of hollow precious metal commonly used in the field of crafts Same as

Once the design of the precious metal products is determined, a pair of molds are ordered from the precious metal factory to the mold factory, and the precious metal sheet is placed on the delivered pair of molds and forged by hydraulic press. When the forging process comes out of the mold part after cutting, after finishing the cutting operation, the forging product obtained by forging processing is finished and bonded welding with the other products manufactured by forging processing of other molds to complete the product.

Since the above method is to apply only physical external force to the metal, it is relatively clean and can increase the volume with a small weight as well as shorten the manufacturing time, while a complicated and delicate design is difficult to manufacture and soft, Hard materials such as gold, silver, and platinum, such as gold, silver, and platinum, can be produced only with soft materials, so hard materials such as 18k, 14k gold, and color gold, which are less ductile, cannot be easily broken. The price of the mold itself and facility cost were also high, which caused the cost of the product to rise.

As another example, when the lost wax method described above is used for the production of hollow noble metals, the solid wax of a rectangular parallelepiped is cut in half (conventionally referred to as upper and lower parts) and each of them is a desired phase of the hollow noble metal. After molding or sculpting in the lower form, they are plastered, lost wax process and casting process. Make a casting of the lower form. Subsequently, a rubber mold having respective upper and lower rubber plates is produced from the upper and lower castings, and wax is injected therein to obtain a wax model identical to the upper and lower shapes of the hollow product. Then, the wax model is subjected to gypsum work, lost wax process and casting process, and the upper and lower parts of the hollow noble metal are made, and the upper and lower parts are joined by gold soldering, and finished with polishing and polishing.

Such a method is not only a cause of defective products such as bubbles generated due to the thickness of the wax is not constant, but too thin thickness can easily collapse without wax injection. Falls. In addition, because the solid wax is processed by hand for a long time, the productivity is lowered, and there is a drawback that delicate and complicated designs or geometric models are impossible to manufacture.

The present invention has been made to solve the above problems, the important step is to apply the wax to the outside of the primary model to cure and then to separate the cured wax from the primary model to the primary upper and lower wax model If the precious metal is hollowed out by making a second upper and lower model from this, and then making a rubber frame through it to secure upper and lower wax models and then joining them to produce a hollow wax model. In particular, it is an object of the present invention to provide a method capable of producing a large amount without restriction on the type of noble metal material, regardless of the shape and quality, as well as constant and good quality of the asymmetric hollow product.

Hereinafter, with reference to the accompanying workflow (Fig. 1) will be described in detail the process of producing a hollow precious metal by the technology of the present invention.

Once the design of the product is decided, the first step is to produce the first model with the same shape as the product. At this time, the model only needs to have the same appearance as the product and does not have to be hollow inside. For example, the model material may be manufactured using a metal that can be relatively easily processed, that is, a metal such as brass, lead, or aluminum. As another example of making the primary model, a solid wax is used. First, the solid wax is molded in the same shape as the hollow noble metal (the inside is full), and the solid wax model is plastered and lost. The wax process and the casting process by molten metal give a casting, the primary model, identical to the external shape of the hollow precious metal product.

In the second step, the outside of the primary model manufactured as described above is coated with a wax of uniform thickness and cured. Curing here does not require a separate treatment, and it hardens naturally if left alone in a wax-coated sieve. In one embodiment of this wax coating, the primary model may be a means for immersing the liquid wax.

On the surface of the primary model as above

The cured wax formed is cut in half to separate the upper and lower halves and separated from the primary model to form the primary upper and lower wax models.

As another example of making the primary top and bottom wax models, one of the top and bottom wax models is first coated with wax, cured, separated from the first model, and then the other half is To obtain a primary wax model.

In the third step, the primary upper and lower wax models are fixed in the flask, and the liquid gypsum is buried and cured to form a plaster mold (commonly referred to as gypsum work). At this time, the wax model is fixed by a conventional method such as partially melting the lower part of the wax model and attaching it to the bottom of the flask. Then, the hardened gypsum mold (with wax model embedded) is fired in a heating furnace such as an electric furnace so that the internal upper and lower wax models are dissolved and discharged (known as a lost wax process), and then the wax is discharged. Secondary upper and lower parts of the same type as the upper and lower parts of the hollow precious metal product are filled by filling the molten metal such as silver into the old plaster mold and then immersing it in cooling water to remove the plaster mold (called 'casting process'). Get a model

In the 4th step, the secondary upper and lower models made in this way are used to produce a rubber moulder for each of them. The mold is often used as an idiomatic means of putting the model into the rubber mold and steaming the rubber with a high temperature and high pressure press. .

In the next five steps, wax is injected into the two rubber molds (each having one upper and lower plate) made as described above, and solidified and pulled, and then the second upper and lower parts are the same as the upper and lower shapes of the hollow precious metal. It becomes a wax model (if the above operation is repeated, several upper and lower wax models are obtained).

In step 6, the upper and lower wax models of the secondary upper and lower wax model (s) manufactured as described above are joined to the upper and lower parts by the same wax material or adhesive, and then the wax figure of the same shape as the hollow precious metal is obtained. (S) comes out.

In step 7, the wax model or wax models made in step 6 are wax tree worked and then placed in a flask, buried and cured to obtain a plaster mold. At this time, in order to prevent gypsum collapse, it is preferable to pin a pin made of a heat-resistant material such as cemented carbide and the like across the wax model. For reference, gypsum decay refers to a phenomenon in which the plaster mold collapses or deforms due to the weight and pressure of the molten metal when the molten metal is filled in the space where the wax is discharged from the mold formed by the gypsum after the wax discharge process.

In step 8, the hardened gypsum mold (with wax or wax models) is fired in a furnace such as an electric furnace to dissolve and discharge the wax model (s) therein (lost wax process), and the molten precious metal in the discharged space. The precious metal casting (s) in the form of a hollow product is obtained by filling gypsum with immersion in cooling water to remove the gypsum mold.

In the final ninth step, by finishing the surface of the hollow casting made as described above, the beautiful hollow precious metal products are completed.

For reference, when the shape of the hollow noble metal is symmetrical, the above process can be performed only by one of the upper and lower models, and in this case, only one rubber frame can be manufactured.

       Also, in the case of injecting wax into the rubber mold, in general, press plates 11 and 12 made of aluminum or the like on the outer side of the upper and lower rubber molds as shown in FIG. 2 to prevent the injected wax from flowing out between the rubber molds. The pressure is constantly applied (by press, etc.), at which time the inner model space 22 of the rubber mold is pressed due to the pressing force, and the thickness of the inner model space becomes thin. When it is about 4-5mm or more, even if it is pressed with a pressure plate, the thinning of the inner space is relatively small compared to the original thickness of the inner model space, so that the wax penetrates smoothly into the rubber frame even when the wax is injected. In terms of strength, there is no problem, but when the internal model space is less than 4 mm thick, the pressing force causes The degree of thinning is relatively large and the wax tends not to be ejected at a uniform and stable thickness.

       As shown in FIG. 3 to improve the above problems, the upper and lower rubber plates 13 and 14 face the upper and lower pressure plates 11 and 12, and the recesses 23 and 24 similar in size to the wax model. It is possible to maintain the thickness of the space in which the wax can be smoothly introduced into the inner mold space because the pressure is not directly transmitted to the indentation part even if pressure is applied from the upper and lower pressure plates by preventing this portion from contacting the pressure plate. have. This is not only useful for the production of hollow precious metals, but also for the manufacture of full-bodied precious metals, it is a technique that can be applied if a wax model is cast by casting wax, solidifying and discharging the rubber mold.

In the above, the present invention has been described with reference to specific embodiments shown in the drawings. It is noted that the illustrated embodiments are merely illustrative examples of features of the present invention, and do not limit the technical scope of the present invention.

As described above, the present invention can be produced in large quantities using various kinds of precious metal materials, including pure gold, regardless of the shape of the hollow precious metal products, and does not require a facility such as a mold or a press as compared to the conventional forging method. The invention is particularly suitable for mass production of precious metals with various design characteristics because the manufacturing cost is greatly reduced or the product model is much easier and easier to manufacture than the lost wax method.

Claims (4)

In manufacturing hollow precious metals, A first step of forming a primary model identical to the external appearance of the product, Applying a wax to the outside of the primary model to cure and separating the cured wax from the primary model to obtain a primary upper and lower wax model; 3 steps to make the second upper and lower model through the plaster work, lost wax process and casting process from the first upper and lower wax model, Four steps of manufacturing a rubber frame from the second upper and lower models, 5 steps of manufacturing the secondary upper and lower wax model (s) by injecting wax into the rubber mold and solidifying and discharging the wax; Step 6 for joining the upper and lower parts of the secondary upper and lower wax model (s) to form the wax model (s) of the same shape as the hollow noble metal. 7 steps of producing a plaster mold through the wax wax operation of the hollow wax model (s), 8 steps of obtaining a hollow precious metal casting through the lost wax process and casting process of the gypsum mold in which the hollow wax model (s) are embedded; Hollow precious metal manufacturing method characterized in that it comprises a nine steps, finishing, processing the surface of the hollow casting made as described above. The method of claim 1, When the upper and lower parts of the hollow noble metal have the same symmetrical shape, the models (primary model, primary upper and lower wax models, secondary upper and lower models, secondary upper and lower wax models) are symmetrical. Method of producing a hollow noble metal, characterized in that the model having a form of any one of the upper or lower. The method according to claim 1 or 2, The primary model is a method for producing a hollow noble metal, characterized in that the solid wax is produced in the same manner as the outer shape of the hollow noble metal. The method according to claim 1 or 2, The rubber frame is a manufacturing method of a precious metal, characterized in that the upper and lower rubber plate is formed on the upper and lower rubber plate in the position facing the upper and lower pressure plate, the recess is similar in size to the wax model.

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