BG66005B1 - Method for the production of constituent elements intended for the manufacture of hollow jewels, and device for the realization thereof - Google Patents

Abstract

The method and the device find application in the jewellery industry, in particular for the manufacture of rings, bracelets, earrings, chainlets, necklaces, etc. The method is reliable, ecologically clean, efficient and cheap, and makes it possible at the same time to produce a wider range of hollow jewels having different forms. The device for realizing the method is simple. The method consists in the following: source material of precious metal is moulded in the form of a plate (1), which is heated until it turns red, whereupon it is cooled and rolled. After that, the plate (1) is cut by roller shears (10) into bands (1), each of the latter being bent around its longitudinal axis until it becomes a tube (19) by means of its consecutive running through a series of nozzles (18) with different size of the openings, which are formed on a profiling strap (17) by a bending mechanism (16). The tube (19) thus formed is wound on an arbor (20) and heated together with it, and after that it iscooled. The wound hollow tubular element (19) is then cut by a thin disk, thus making non-closed links of a different profile, which are mechanically interlaced to make chainlets, necklaces, etc.

Description

Technical field

The invention relates to a method for the manufacture of components for the manufacture of hollow precious metal jewelry and is used in the jewelry industry, in particular for the manufacture of rings, bracelets, earrings, chains, necklaces and more.

BACKGROUND OF THE INVENTION

A method of manufacturing composite profile components for the manufacture of hollow jewelery disclosed in EP 0638256/1 / is known. According to this method, a rectangular plate of base metal or an alloy of base metals is prepared in advance, and then a plate of precious metal or an alloy based on precious metal, in particular gold, is obtained on the surface by hot or cold coating. combined profile of two metals. The precious metal plate is obtained by continuous casting.

The combined plate thus obtained is rolled and drawn until appropriate thickness is obtained to produce the corresponding hollow jewelry. In the next step, the combined roll profile is formed into strips, and then each strip is bent, turning into a tube, bent around its longitudinal axis so that the outer surface of the tube is of precious metal. Bending is done by passing the strap through a cylindrical opening of the nozzle so that the side edges of the strap touch their entire length.

The resulting tube may be of different cross-sections depending on the shape of the nozzle (e.g., square, circular, oval, etc.) of the nozzle and then further drawn off the tube to obtain the desired final diameter.

As a final step before receiving the workpiece, the core of the base metal or base metal alloy is dissolved using nitric acid for high carat gold jewelry (18 carats) and dilute sulfuric acid for low carat gold jewelry. (9 carats). After finishing the workpiece, hollow profiles are obtained in the desired shape, the resulting hollow profiles being wound into a mandrel, which can be of different geometric shapes, and then cut to obtain rings serving as jewelry making elements, for example links for necklaces or bracelets, or links for necklaces or necklaces.

This method of making hollow jewelry blanks is more laborious and has a detrimental effect on workers, since products harmful to human health, such as nitric or sulfuric acids, are used to dissolve and remove the core from the base metal. . In addition, this method is quite expensive and inefficient, since the base metal used, upon receipt of the tube blank, is dissolved and disposed of as unusable material containing harmful environmental pollutants.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a method for the manufacture of constituent elements for the manufacture of precious precious metal jewelry, which is reliable, environmentally friendly, more efficient, cheaper and at the same time enabling the production of a wide range of different shaped hollow jewelry.

The task is solved by the proposed method of manufacturing constituents intended for the manufacture of hollow precious metal jewelry and their alloys, both silver and gold, comprising the following steps.

Initially, a granular precious metal, with a standard sample, is taken through the vessel, then the vessel is heated to liquefy the metal. The molten metal is poured into a foundry mold to form a rectangular plate of this precious metal.

In the next step, the resulting rectangular plate is removed from the mold and heated

66005 B1 until redness, and then cooled slowly to increase the plasticity of the material.

The resulting plate is rolled on a roller mechanism, the thickness of the plate being adjusted by the distance between the rollers by means of a screw mechanism.

The plate separated from the roller mechanism is cut into strips, in certain steps, by a roller shears.

In the next step, the resulting strips are heated to redness and cooled again to increase their plasticity. The bands can be heated by oxygen burners until they are red, and for cooling they are immersed in water or in 98% alcohol solution.

Each of the strips thus treated is bent about its longitudinal axis until it becomes a tube, and for this purpose the strip passes through nozzle openings formed on a profile plate by the bending mechanism. In order to gradually bend the strip to obtain a hollow tubular element of the required size, the diameter of the nozzle orifice is progressively reduced from the first to the last orifice. The width of the strap is equal to the circumference of the opening of the smallest nozzle. Prior to bending the strips, each strip is greased to allow it to flow through the nozzles. In addition, each strip is pre-sharpened to make it easier to insert it into the opening of the nozzle. The hollow tubular elements obtained may have different cross-sections depending on the shape of the nozzle opening.

The resulting hollow tubular elements are wound on the mandrel, with the precious metal profile wound on the mandrel reheated and cooled to unscrew the tubular element, and then the mandrel is mechanically removed. The mandrel may have a different external profile. The resulting hollow tubular element is then cut using a thin disk to produce closed rings that can be of different shapes, depending on the outer profile of the mandrel.

The rings obtained are the constituent elements of which hollow jewelry is made, through their mechanical entanglement, whereby chains, necklaces, necklaces, etc. are obtained as a final step.

The slits of the unopened hollow rings are soldered using a solder consisting of zinc and silver, or gold and cadmium. For brilliance, jewelry can be further processed and solders cleaned and polished.

Explanation of the annexed figures

An exemplary embodiment is shown in the accompanying figures, of which:

Figure 1 is an axonometric view of the molding of the rectangular plate;

Figure 2 is a schematic representation of a cooling vessel;

Figure 3 is a schematic representation of a roller mechanism;

Figure 4 is a schematic representation of a roller scissors;

Figure 5 is a schematic representation of a bending mechanism;

Figure 6 is an axonometric view of a hollow tube element;

7 is an axonometric view of a mandrel with the hollow tube element bent.

Examples of carrying out the invention

The method of manufacturing constituents intended for the manufacture of hollow precious metal jewelry is carried out by initially taking granular material, for example gold with sample 585 or silver with sample 925, through a container with handle 4, and then heating the vessel with oxygen. burner to liquefy the metal. The liquid metal is poured into a mold 21 to form a rectangular plate 1 of precious metal.

The plate 1 thus obtained is removed from the mold 21 and heated to redness by an oxygen burner, and then immersed in a vessel 5 with cold water or pure alcohol (98%) to obtain malleability and increase plasticity.

The resulting plate 1 is rolled on a roller mechanism 6, the thickness of the plate 1 being adjusted by the distance between the rollers 8, which is carried out by a screw mechanism 7. The plate 1 is then removed from the roller

66005 Bl mechanism 7 and is cut in 0.5 mm increments by roller shear 10 into strips 2.5 to 12 mm in size.

The cut strips 1 are heated through the oxygen burners until they are red and then immersed in cooling water.

The strip 1 thus treated is bent in the form of a pipe 19, passing through the openings of nozzles 18, in which the size of the openings progressively decreases from the first to the last, whereby the strip 1 gradually bends, forming a hollow pipe 19, bent along the longitudinal its axis. In order to make it easier for the strip 1 to be inserted into the opening of the corresponding nozzle 18, each strip 1 is pre-greased with beeswax or machine oil and each strip 1 is sharpened. The width of the strip 1 is equal to the diameter of the first nozzle opening 18.

Alternative solutions are possible in which the shape of the nozzle opening 18 is different from the circular geometric shape, such as polygonal, rectangular, oval.

The resulting hollow tubular element 19 is wound on a mandrel 20, after which the element 19 is heated and cooled to repel the material. The mandrel 20 is mechanically removed by cutting the convoluted hollow tubular element 19 with a thin disk, producing unopened rings of different profiles, from which mechanical chains are made of chains, chains, etc.

In order to obtain a different shape of the hollow tubular element 19, which also determines the shape of the rings, in various embodiments, the mandrel 20 may be formed with different cross-sections. The mandrel 20 may be made of cord or copper and can be easily removed by heating and burning it.

The slits of the unopened hollow rings are soldered with an oxygen burner using a solder consisting of zinc and silver. In another embodiment, a solder of gold and cadmium is used to solder the openings of the open hollow rings.

Cleaning of the joints is carried out with an abrasive eraser or sandpaper and the polished jewelry is polished.

Application of the invention

The method is carried out by means of a device consisting of separate units, to which the method is performed in a certain sequence.

The first unit is a mold 21 for producing a precious metal plate and has a rectangular cross-section, the two long sides 2 being fixed to each other by movable brackets 3 through which the resulting rectangular plate 1 can be easily separated.

The second unit is a heating and cooling facility 5 with water or alcohol (98%).

The third unit is a roller mechanism 6 consisting of a housing in which two movable shafts 8 and 9 are mounted in parallel, the distance between which can be adjusted by means of a screw mechanism 7.

The fourth member is designed as a roller shear 10 and consists of a base on which the bracket 12 is fixed, at the upper end of which are mounted two parallel disposed arms 14 and 15. A stationary cutting roller 13 is fixed perpendicularly to the upper arm 14, and two movable cutting rollers 22 are arranged perpendicularly to the lower arm, located on both sides of the stationary cutting roller 13. A handle 11 is mounted to the lower arm, whereby the cutting of the strip of strips 1 is carried out between the three rollers 13 and 22, such as the width o the strip 1 is equal to the width of the stationary roll 13.

The fifth link is the bending mechanism 16, comprising a stand with a profile bar 17, on which nozzle openings 18 are formed, the diameters of which progressively decrease from the first to the last. The nozzle openings 18 have a size of 0.30 to 6 mm and increase in 0.05 mm. This ratio applies to nozzles 18 with circular profile as well as to other profiles such as square, rectangular, triangular, oval, hemisphere, etc. The nozzles 18 are made of hard-alloy steel to prevent wear and tear on the opening of the nozzle 18 and hence deformation of the hollow jewelry elements.

The sixth link is a mandrel 20 whose cross-section can be in different geometries

66005 Bl shapes and sizes.

Claims (6)

Claims 1. A method of manufacturing constituents for the manufacture of hollow precious metal jewelry in which a rectangular plate of precious metal is cast, then rolled and drawn to achieve the required thickness and then formed into strips, each of which is bent about its longitudinal axis by passing through the opening of the nozzle until it becomes a tube, the resulting hollow tube being used as a blank to obtain the constituent elements, characterized in that the rectangular plate (1) after casting se n heat up to redness and then cool, forming the strips by cutting the roller plate (10) in certain steps, after which the strips are heated and cooled, before lubricating each strip with lubricant and is sharpened at one end to feed and pass through a series of nozzles (18) with progressively decreasing diameter, winding the resulting hollow tubular element (19) on a mandrel (20) and subjecting it to heating and subsequent cooling, such as, after cooling, the hollow tubular trunk ent (19) is removed from the mandrel (20) and is cut through the disc to obtain 30 unclosed rings with a different profile. 2. A method of manufacturing components for the manufacture of hollow jewelry according to claim 1, characterized in that the closed rings are obtained 3. A method of manufacturing components for the manufacture of hollow jewelry according to claims 1 and 2, characterized in that the slits of the unopened 10 hollow rings are soldered and polished. 4. A method of manufacturing components for the manufacture of hollow jewelry according to claim 1, characterized in that the heating of the strips is effected. 15 is done through oxygen burners. 5. A method of manufacturing constituents for the manufacture of hollow jewelry according to claim 1, characterized in that the cooling of the strips is effected. 20 will evaporate by immersion in cold water or in 98% alcohol solution. 5 are knit for making hollow jewelry. A method of manufacturing constituents for the manufacture of hollow jewelry according to claim 1, characterized in that the step of cutting the strip (1) into strips is from 0.3 to 0.7 mm.