Process for molding artificial gemstone cones

Abstract

The invention discloses a process for molding artificial gemstone cones. The process includes steps of 1, melting and uniformly mixing raw materials with one another to form melt, placing the raw materials in crucibles and smelting the raw materials at the temperatures of 2600-2800 DEG C for at least 2 h; 2, injecting the melt in cylindrical molds, sealing openings of the molds by covers, automatically lowering the temperature of the melt to carry out glass transition, placing the cylindrical molds in vibration aging devices in cooling procedures, carrying out continuous resonance, and placingthe vibration aging devices in argon atmosphere during vibration; 3, stopping resonance when the temperature of the melt is lowered and reaches approximately 1800 DEG C, taking out the molds and keeping the molds unchanged at the temperatures of approximately 1800 DEG C under the pressures of 50-100 mbar for 3 h; 4, continuing to naturally lower the temperatures until the temperatures reach the normal temperature so as to obtain products. The raw materials include, by weight, 20-40 parts of SiO2, 0.1-0.3 part of Cr2O3, 0.2-0.5 part of CePO4, 0.1-0.4 part of Nd2O3, 0.3-0.8 part of La2O3 and 0.5-0.8 part of CaO.

Description

technical field [0001] The invention relates to the field of gem manufacturing technology, in particular to a multi-color gem cone forming process. Background technique [0002] There are two main difficulties in the existing artificial gemstone production process. One is that the production process is relatively complicated, and the control of the shape of the gemstone is troublesome. The shapes of artificial gemstones are mainly cylindrical, pear-shaped, conical, flake, etc. If you want other shapes such as conical artificial gemstones, you generally need to polish them later. Second, the present artificial gemstones are mainly monochromatic gemstones, and only a few manufacturers can produce colorful gemstones. Polychrome gemstones are color-changing gemstones, that is, they produce distinctly different colors under sunlight and incandescent light. [0003] Chinese patent document 20181040828.8 discloses artificial color-changing gemstones and a preparation method there...

AI Technical Summary

Problems solved by technology

[0002] There are two main difficulties in the existing artificial gemstone production process. One is that the production process is relatively complicated, and the control of the shape of the gemstone is troublesome. The shapes of artificial gemstones are mainly cylindrical, pear-shaped, conical, flake, etc. If you want other shapes such as conical artificial gemstones, you generally need to polish them later.

Second, the current artificial gemstones are mainly monochromatic gemstones, and only a few manufacturers can produce colorful gemstones.

However, due to the chromogen added, it does not provide an artificial gemstone that appears pink, green, or blue-green under different light

[0004] At the same time, the existing artificial gemstone manufacturing process has high requirements for operation. Now there is a production method for imitation gemstones, which is mainly obtained by injecting plastic into a mold. The process is relatively easy to control and simple, but it is directly applied to the production of artificial gemstones. However, there will be problems in the process. This is because the mold is used to limit the molding. During the crystallization process of artificial gemstones, the internal stress cannot be well eliminated. Due to the external force of the mold, there are various crystal defects in the crystal growth process. The product has a large number of obvious lines visible to the naked eye, it is not transparent, and the product cannot be used as a decorative gemstone

[0005] Chinese patent document 201810434400.1 discloses a method for manufacturing artificial gemstones and artificial gemstones. The process uses preformed materials in a melt state to inject molds into molds. However, it does not solve the problem that the edges of gemstones are restricted and cannot be freely generated, resulting in large internal stress. , the problem of a large number of textures inside can also be understood as the existence of a large number of crystal gaps, resulting in poor transparency