SK67694A3 - Process for production of casted and set pieces of jewelry - Google Patents

Description

Jewelry with one or more set stones is made by making a prototype model with stones flanges, making a prototype mold by pulling the model prototype out of the mold, making a casting or injection molding model by heating the dissolving modeling mass in the prototype mold, placing the stones in the model and by manufacturing a casting mold, casting metal into a casting mold according to a centrifugal casting method and vacuum casting, and removing the jewel after cooling the metal from the mold.

Method of making cast cast jewelry

Technical field

The invention starts from a method with the features mentioned in the preamble of claim 1.

BACKGROUND OF THE INVENTION

DE 38 24 574 A1 discloses a casting method according to a fusible wax model for making jewelry. According to this method, a prototype jewelry model is first produced. A prototype is then produced by molding a prototype casting. The casting can be made by pouring a molding compound, for example a two-component 1-rubber compound, into a container in which the prototype of the model is arranged, after which the molding compound is allowed to cure, the body thus formed is cut into two halves and thermoplastic these are pulled out and these prototype naturally 188 Al is the prototype model. However, the prototype between the two blocks is heated under pressure until they deform and adhere closely to the model, thereby producing a true imprint of the prototype of the model in both blocks (DE 35 46).

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The molds are generally called rubber molds formed in a two-part fashion, consisting of an elastomeric such mold, which is now poured or sprayed with a modeling compound, in particular a wax. After cooling the molding mass, the initial mold is opened and the model is withdrawn. A plurality of models are usually joined to a model tree and then embedded in a refractory molding composition.

Here, the molding composition is considered to be flame-resistant if it can withstand the effect of the molten metal from which the jewel is made without changing its shape.

After pouring the model tree into the refractory mixture, the modeling mass constituting the model tree is heated; if the modeling mass is a wax or a low melting metal, it will melt (casting according to the fusible model); if the modeling mass is plastic, then it is fired. The molten metal from which the jewelry is to consist is then poured into the casting mold thus produced. To allow the metal to penetrate to the last corner and branching of the casting mold, it is possible to cast it with or during casting (vacuum casting). After spinning (centrifugal casting) promote by applying a vacuum of solidification and cooling, the tree, which consists of jewelry, is pulled out of the mold and the jewelry is separated from each other.

It is also known that in making jewelry with one or more set stones, these are cast with them. To this end, a prototype of a jewel model is made into which stones are set, and a casting is made from this prototype to produce a prototype mold. Such a prototype mold, which is a negative form of jewelry, therefore contains a recess for the stones. These recesses of the prototype mold are set with stones for jewelry, then the mold is poured with modeling compound or sprayed and the jewelry model thus produced is further processed as described above. Of course, it is difficult to place the stones correctly in the prototype mold in terms of their position and to fix them so that, after being cast or sprayed with modeling clay, they have exactly the position they should have later in the jewelry.

Rather, the position of the stones changes more often after pouring or spraying, and the extent of the spraying varies from model to model, due to variations in the shape of the stones.

It is already known from FR 1,599,866 that ornamental stones are embedded in a wax model, such wax models being joined to a wax model tree and further processed by casting according to the fusible model on cast jewelry. However, the ornamental stones are not inserted into a special wax pattern on the wax model, but are inserted into the wax model without a bead. Therefore, the cast jewel also has no special fascination for the stones.

It is known from FR-A-2 366 812 to produce a prototype of a model in which the stone is already embedded in a finish which is already final in shape, then the stone is carefully pulled out so that the finish is not changed, then an empty model prototype is cast forming a rubber mold in which the stone is embedded in the fascia. A model tree is then assembled from such models, which is cast into gypsum, the plastic is expanded and the casting mold thus produced is poured with a noble metal. The disadvantage of this is that for the production of the model, a material is required which is so flexible that the stones can be inserted into the finished fascia. The modeling waxes that are commonly used cause difficulties because of their non-resilience, and therefore FR-A-2 366 812 recommends a plastic that can be processed in a two-stage thermal process, namely melting and subsequent shock heating to a temperature which is necessary for casting the metal and at which the plastic decomposes. Furthermore, it is disadvantageous that the stone holds firmly only when it has exactly the same size and shape as that which was embedded in the prototype model. However, this usually does not happen, so it is necessary to do additional expensive work on the cast jewel.

It is an object of the present invention to improve the aforementioned method so as to obtain as precisely as possible a jewel with precisely set stones, nor that additional work on the jewelery is necessary.

SUMMARY OF THE INVENTION

This object is achieved by a method with the features of claims 1 or 2. Further advantageous embodiments of the invention are the subject of the dependent claims.

In the method according to the invention, as in the known methods, a prototype of the jewel model to be produced is first produced. This prototype has one or more fascinations, which corresponds to the number of decorative ornamental stones planned, but the ornamental stones are therefore not set in the model type. In fascinating with the cracking technique, for example, the beads that are to fascinate the ornamental stones do not bend inwardly, but retain their original alignment, which they change prior to the embedding of the ornamental stones. Then, from the prototype of the model, in which no ornamental stone has been set yet, the negative form is made as the primary form and in this primary form the jewelry model is cast. In this case, wax serves as a modeling compound.

stone

The model produced in this way is now fitted with ornamental frames which, in such a way that they are fitted, make it possible for the stone model to be completely arranged. Due to the positive form, as in the case of the original jewel, the freely accessible top of the jewelry as casting according to the fusible accessible recesses in the jewelry can fit into the collars and do not have to slip into the model's hardly negative form. The placement of the stones in the wax pattern beadings can be done, for example, by means of a suction means whereby one or another of the applicator, the stone is sucked in, grasped by the suction and inserted air into the bead already has flanges and then left unplugged. The stone is then just fastened. The fixing of the stones in their flanges is preferably done so that the heat is softened so that they can be deformed by action, adapted to be plasticized and shaped, preferably by the upper end, that the tool, the flanging tool and the stone are heated in a single flange by pressing It creates. This is not only the case with the ripping technique or these grains of stone with grains in which the ripples or places embrace like fingers, but also with the frames that embrace the stone after being inserted into the circumferential frame.

the tool has the advantage of being fitted all over it would be like for plastic deformation of the rim a tool which has a tip to be used with

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framed peripheral grain surface, trim the edge on and then take the stone. In the case of the edge against or the embossing, the projections with which the adjacent tool, or eventually an attached tool, on which it has grains, crushing and clamping the fringe are used with correspondingly heated projections, whereby the stone edges are advantageously softened. just a short touch with the tool.

that in any case they do not need to deform the beads or grains so that the decorative stones or the beads deformed by the effect of heat with the stone edge as the metal have shown all fastened, has a closer contact with the shell, the pressed stone.

in the usual manner against the edge, it is advantageous for the subframe to deform only the grape and possibly the grains and, on the other hand, do not deform it. stay

Therefore, the amount of the other remains or deformed by grain fascia in a manner distorted, with which the fascia is retained.

In this way, the individual cracks were taken into account, as in the same way as the non-deformed cracks present, the usual impression of a conventional crape In the four-stone creep fascia, only two opposing cracks deform, .

krapňami na

Placing and fixing stones in the model is so easy that it can be controlled even by an untrained workforce after a short workout. The process according to the invention is therefore particularly suitable for the industrial manufacture of jewelry. Already in the test phase of the method according to the invention, it has been shown that the cost of fitting the ornamental stones could be reduced very strongly: in comparison with the conventional technique whereby the stones are inserted into the finished cast rings of the rings, the cost of felling can be reduced to 1/10; Compared to the conventional casting model, where the stones are already embedded in the wax model, costs can still be reduced to 1/4.

Further processing of the model produced according to the invention is carried out as is known per se in the centrifugal casting or vacuum casting of jewelry. The following example serves as an explanation.

Examples

A jewel, such as a ring, which is to exhibit more ornamental stones, is made in a manner known per se by a prototype of a metal model. The prototype of the model has a stone fascia for the stones, but the stones are not planted. The prototype model is inserted between two blocks of thermoplastic silicone elastomer, which are then heated and pressed against each other. As a result, the silicone elastomer plastically deforms and adheres to the prototype of the model, resulting in a naturally accurate impression of the prototype of the model in both blocks. Both blocks deformed in this manner form both parts of the prototype mold into which the wax is then sprayed. After cooling the wax, the initial mold is opened and the wax model of the jewel is withdrawn. The planks formed in the wax model of, for example, four beads are then planted with the aid of a suction applicator and fixed by placing the forked tool whose teeth are electrically heated and spaced apart from the two opposite beads, are fitted onto the flange and pressed down easily, which softly and softens together and their current adjacent stone edge embraces. From a number of wax patterns produced in this way, a wax pattern tree is then made in a manner known per se, placed in a cuvette and poured out with fine gypsum, for example alabaster. After gypsum solidifies, the cuvette is heated, thereby melting the wax; the gypsum casting of the tree with wax patterns remains in the cuvette. The cuvette is heated to a temperature of about 750 ° C, placed in a centrifugal casting machine and poured into a molten 14 carat gold alloy which is allowed to solidify in a rotating cuvette. After cooling the cuvette to about 40 ° C, the gypsum breaks and releases the cast tree. Jewelry is now cut off from the tree, cleaned and possibly polished.

The method described is particularly suitable for jewelry with small ornamental stones, the fascination of which is sufficient with short beads not longer than 2.5 or 3 mm. In a preferred embodiment of the invention, particularly simple methods are provided for setting larger ornamental stones. These are explained in more detail in the accompanying drawings.

Overview of the figures in the drawing

Fig. 1 shows, as an example 2, a cross-section of a wax model of a ring with a seating consisting of four cracks or claws.

Fig. 2 shows a plan view of the wax model of FIG. 1 with ornamental stone and

Fig. 3 shows, as an example 3, a cross-sectional view of a waxed ring frame ring.

Examples

The wax model shown in FIG. 1, the rings of the ring 1, have a flange of four cracks or claws 2 to 5 that are 3mm long. As a bearing for a larger stone to be planted, for example Emerald-type rose quartz, the cracks 2 to 5 near their upper ends now have a notch 6 which is milled into the cracks 2 to 5 of the wax model or may already be arranged in a prototype model. Surprisingly, it has been found that the cracks 2 to 5 are sufficiently resilient to fix the resiliently ornamental stone in the notches 6. To this end, the ornamental stone 7 can be inserted with its edge to be planted, first into two adjacent notches 6, for example, 2 and 5, and then its opposite edge should be pressed into the notches 6 of the other 2 and 3 ornaments. Rather, the wax pattern can only be further processed with the ornamental stone 7 inserted into a tree with wax patterns. The procedure can be carried out as in Example 1.

The wax model shown in FIG. 3 of the ring ring 11 has a frame 12 embossed as a recess in the ring ring 11, and in particular has a round bead for the stone 13 ground into a round. In order to attach the edge 14 arranged on the perimeter of the stone to the stone 13, the flange 12 has a circular groove 15. This flange 12 can be preformed as much as possible in the prototype model and then can be made in the wax model, in particular by milling the groove 15 model. Surprisingly, the stone 13 can be pushed into the flange and then the wax-shaped flange can be fixed to the wax by springing; to this end, it is neither necessary to divide the spherical rim 12 into segments, nor is it necessary to thermally deform the spherical rim 12 after setting the stone 13 in order to fix the stone 13. Further, in this third embodiment, the same procedure as in the first example can be used.

The second and third examples are particularly simple and inexpensive to manufacture and have the additional advantage that the facings in the finished jewel will look externally the same as the facings in which the stones have been planted only after centrifugal casting or vacuum casting.

Claims (5)

A method of making jewelry with one or more faceted stones by manufacturing a prototype model with empty rims for stones, producing a prototype mold by pulling a prototype model not yet containing stones from the mold, - making a wax castable or injectable model and dissolving by heating, as modeling clay, in a prototype mold, - by placing the stones in the model's flanges, - fixing the stone in its skirt by plastic deformation of the model flange, making the mold by casting the model into a refractory molding compound and extruding the molding mass from the mold, - pouring metal into the casting mold, -pulling out the jewel after the metal has solidified from the mold. 2. A method of making patterns of wax that can be cast or injected and heated to dissolve as a modeling mass for use in a method of making jewelry with one or more faceted stones, by casting the pattern into a refractory molding composition and then drawing it out the mold mass forms the molds, the mold is not poured into the mold and the jewel is pulled out of the mold after the metal has solidified, making a prototype model with empty stones for stones, making a prototype mold by pulling a prototype model that still contains no stones from the mold; mass in prototype form, - by placing the stones in the model, fixing the remaining stones in its skirt by plastic deformation of the model's skirt, Method according to claim 1 or 2, characterized in that the flanges are thermally deformed. The method according to claim 3, characterized in that the tool adapted to the shape of the upper end of the folding rim is heated, is mounted on the rim and is formed in a single step by pressing the tool. • « Method according to one from previous * claims e by that is T the flanges only deform by places. The method of claim 5, sa v y z on the - It starts by taking the fasovaní do krapien or grains only deform a partial amount of cracks or grains.