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INVENTION
Russian Federation Patent RU2151023
METHOD FOR PRODUCING HOLLOW JEWELRY

Name of applicant: Pomelnikova Olga
Name of the inventor: Pomelnikova Olga
The name of the patentee: Pomelnikova Olga
Address for correspondence: 195426, St. Petersburg, pr.Kosygina 9, block 2, kv.410, Petrova ETC.
Starting date of the patent: 1999.02.01

The invention relates to the manufacture of hollow products and technologies can be used in jewelery. In the production of hollow jewelery perform metal master model body together with shaft and runner. The metal master model cavity is performed in conjunction with the shank. According to the master model manufactured elastic mold. Next up is carried out forming cavity master model, manufacturing investment casting product shell, the subsequent receipt of the metal casting. Implementation of master models in conjunction with the shank provides a more rigid construction of master models and molds. Master model increased rigidity can be used repeatedly, allowing you to increase productivity and product quality, but also reduce labor costs.

DESCRIPTION OF THE INVENTION

The invention relates to a hollow-product manufacturing technology, for example jewelry, including enamel, and is intended for use in jewelery.

A method for manufacturing hollow jewelry, including the implementation of the body cavity and the metal master model made them flexible molds, forming a copy of the master model cavity, manufacturing investment casting shell products and the subsequent receipt of a metal casting (sm. USSR Patent N 1813026, cl. 22 Bed and D 25/02, publ. 30.04.93 method of hollow jewelery manufacturing). The known method selected for the prototype includes a number of metal cabinet and cavity master models with a through hole, which is then entered dowel rods that are used in the manufacture of elastic molds, and in the preparation of investment casting product shell, serving as a centering element. This method reduces the performance of quality investment casting body products due to lack of alignment is not required providing equal thickness of the wax model. Furthermore, the use of reusable metallic difficult master models, which generally considerably reduces the possibilities of its use.

Unlike the claimed method consists in the fact that in the known method of manufacturing hollow jewelry comprising performing housing and cavity metal master models, performing them flexible mold, forming a copy cavity master model, production smelted product model building and subsequent reception of the metal casting, cabinet metal master model operate in conjunction with the shaft and runner, luminal metal master model operate in conjunction with the shaft, and at molding cavity master copy of the model in place the rod that is removed from the metal casting body products.

Additionally, the shank portion adjacent the master model operate cone.

In addition, when forming the master copy of the cavity model using a rod of square section.

Furthermore, when forming cavity up to the master model is used as the moldable mixture medical gypsum.

An analysis of scientific, technical and patent literature shows that the main difficulty in the manufacturing method of hollow jewelry is to obtain a high-quality wax model from which just depends on the quality of the final product. Traditional methods for producing a wax model based on the use of a centering rod when the metal master models and elastic molds, and upon receipt wax mold when molded cavity arranged in an elastic mold body. It is at this stage of the operation using a centering rod occurs unevenness not only the sidewalls due to pinch the elastic mold halves, but most importantly, gage, usually a consequence of insufficient alignment preformed cavity in an elastic mold body, as there is no reliable fixation along axis.

The essence of the claimed process consists in that, instead of aligning rods used in the inventive process shank. Thus, the performance of the metal master model in conjunction with the shank and the runner increases structural rigidity, allowing you to use it repeatedly. Performing abdominal metal master model in conjunction with the shaft and leads to increased stiffness and reuse. In this case, if the size of the cavity master model is made with taking into account the thickness of the wall of the future product, the shank size of the cavity master model is made with taking into account the shrinkage of the elastic mold housing master model that is just right and allows accurately align considering shrinkage subsequent process molding the wax model.

An essential feature for the manufacture of hollow articles by the inventive process is the placement of a copy during molding cavity master model rod which is mounted in a mold at filling the moldable mixture. Such an arrangement allows the stiffness of the molded cavity with its associated shank, keep this rigidity in the process of filling in the form a model structure and after removal from the wax model forms the shank rod will perform its function of providing equal thickness and melting of wax in the flask, and its calcination, and pouring the molten metal, thus providing rigidity and integrity of the cavity throughout the process technology.

Additionally, the shank portion adjacent the master model operate cone. Since the tapered portion of the shank is performed, thereby ensured not only increase its diameter (compared to the diameter of the centering bar prototype), but also increase the end surfaces, which allows more ideal target cavity formed in an elastic mold body. That increased stem surface and prevents the opportunity to experience elastic half-mold, which is especially important because the contraction is most often the cause of polythickness received shell model. Thus, the shank is obtained with the developed conical and end surfaces, which when placed copies of the master model cavity in the body mold completely prevent possible backlash along the axis, and hence the unevenness of the future product. Therefore, in the inventive process by performing a master models in conjunction with the shaft misalignment is completely eliminated, which leads to lower quality, manifested in the grow-smelted product model body that most often is the source of marriage.

In addition, copies of the cavity for forming the master model using a rod of square section. This is due to the fact that maintaining rigidity during manufacture of the wax model, a rod of square section promotes better adhesion to the molding mixture kakoe-libo prevents it from turning during the removal of the model formulation followed by calcination and metal casting that is accompanied by thermal and vibration effects.

Furthermore, when forming cavity up to the master model is used as the moldable mixture medical gypsum. Such an arrangement makes it possible not only to use the inherent property of a medical plaster rapid solidification, but also to get a flat and hard surface copies cavity master model. This, in turn, after producing a metal casting body facilitates removal of residue inside the gypsum.

The claimed method is more manufacturable and compared with known, as not only simplifies the process of manufacturing a master model in conjunction with the execution of elastic shanks and molds through the use of a smaller number of elements, but also provides greater rigidity during subsequent manufacturing operations hollow articles. In addition, increased manufacturability and is manifested in multiple use of master models, and the possibility of using a single cavity master model for a variety of case-master model, which creates a new property - the unification process technology manufacturing cavity products.

Thus, the implementation of the shank together with the metal master model provides a more rigid structure as the master models and produced them elastic molds and body cavities. In addition, the increased stiffness of the master models, allowing you to use them several times, increases productivity and reduces labor costs, and most importantly - improves the quality of the product.

Implementation of the proposed method is illustrated by drawings.

FIG. 1 shows a master model of the housing; FIG. 2 - the same, but the cavity; FIG. 3 - manufacturing an elastic mold cavity; FIG. 4 - making a copy of the master model cavity; FIG. 5 - production of elastic molds of the body; FIG. 6 - production of wax models; FIG. 7 shows the investment casting shell products. Figures indicated: 1 - the master model of the housing; 2 - a shaft housing master model; 3 - runner; 4 - the master model of the cavity; 5 - shank cavity master model; 6 - elastic mold cavity for a master model; 7 - a copy of the master model cavity; 8 - rod; 9 - elastic mold for housing the master model; 10 - a wax model; 11 - a wax sprue.

The claimed method is performed as follows. Perform a metal master model 1 body together with shaft 2 and gate 3, on the surface of the master model 1 can be applied to decorating relief. Perform a metal master model 4 (Fig. 2) together with the shank cavity 5. Make a releasable elastic mold 6 (Fig. 5) on the master model cavity 4 together with the shaft 5. Make a copy of 7 (Fig. 4), the master 4 cavity model, while before pouring molding sand into the elastic mold 6 on the master model 4 axis disposed rod 8 square. Make a split flexible mold 9 (Fig. B) for housing the master model 1, getting into the mold impressions 9 master model 1, the shank 2 and the gate 3. Make a wax model 10 (FIG. 6), which in preformed flexible mold 9 corps placed a copy of the master model 7 4 cavity, combining shank 5 master model 4 with the shape of the shank 2. with a uniform elastic compression mold 9 is formed inside the thin-walled hollow form 10, which is poured through the gate 11 model structure. After cooling structure and an elastic connector mold 9 from a wax model 10 is removed from the shaft 8 of the shank 5 form, as a result of a wax model 10 is a sprue 11 and a rod 8, of which the shape is placed in the cavity (Fig. 7). Then the wax model 10 soldered to the injection riser (Fig. Not shown) disposed in the flask for the manufacture of precision investment casting technology which is covered in the literature. At the same time the rod 8, with melting of the wax, baking flask and fill the metal continues to provide a copy of the recording of abdominal master model, providing a wall thickness equal to the product's enclosure.

A specific example of the method. Master model cabinet 1 including a shaft 2 and gate 3, made of brass rod, the surface pattern 1 is applied with the possible pattern of individual elements by soldering. Master-model 4 (Fig. 2) cavitary shank 5 manufactured from brass with a flexible, taking into account the shrinkage of the mold housing. Produced a split elastic mold 6 (Fig. 3) in four models shank 5. When producing copies 7 (FIG. 4), four master model to a mold on its axis 6 placed rod 8 square 1,5h1,5 mm made of nichrome, followed by 6 form filled moldable mixture, which was used as a high-early medical gypsum. When solidification mold 7 was obtained a copy of the master model 4 cavity together with a copy of the shank 5, which was located on the axis of the spindle 8. Manufactures detachable elastic mold 9 (fig. 5) for Model 1 with a shaft 2 and gate 3. Further, the elastic press - form 9 placed copy master model 4 in a mold 7 (Figure 6.) and because the shanks forms 2 and 5 are identical, and the shank 5 performed considering shrinkage elastic mold 9 housing a master model 1, the abdominal form 4 was placed equidistant from the body copy of the model 1. This was achieved both by increasing the diameter of the shank 2 and 5, and at the expense of increased end surfaces, completely eliminating possible axial play kakoy-libo form 7 in the mold 9, which allows uniform while the product. After fixation, the mold 11 through the gate 9 in its composition is introduced as a model of wax. Thereby, investment casting 10 product casing, inside which there was a plaster cavity 7 placed inside the shaft 8, and after removal of gypsum liner model comprises a shell 10 with runner 11 and the rod 8 (FIG. 7), which is then soldered to the molding sprue placed in the flask (Fig. not shown).

Use in the manufacture of hollow jewelery claimed method provides multiple replication products, a significant simplification of technology and quality, that at low material costs will help you find the claimed technical solution required application.

CLAIM

1. A method of manufacturing hollow jewelry, including the implementation of the body cavity and the metal master model made them flexible molds, forming a copy of the master model cavity, manufacturing investment casting shell products and the subsequent receipt of a metal casting, characterized in that the metal cabinet master model operate in conjunction with the shaft and runner, luminal metal master model operate in conjunction with the shaft, and at molding cavity master copy of the model in place the rod that is removed from the metal casting body products.

2. The method of claim 1, wherein said shank portion adjacent to the master model operate cone.

3. The method of claim. 1, characterized in that the molding cavity copy master model using square rod.

4. The method of claim. 1, characterized in that when forming the master copies of the cavity model as a moldable mixture is used medical gypsum.

print version
Publication date 03.01.2007gg

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