(1) Reduce labor intensity, save labor time, and improve the accuracy of model plate making. In the past, craftsmen hand-carved wax and made plates, which was time-consuming and laborious, and the accuracy was not high. Once there was a problem with the original version, it had to be reworked. 3D printing technology is different. It draws jewelry models by computer, and in the process of drawing models, it is controlled by computer with precise data, which is more accurate in size and shape than traditional manual work. The three-dimensional graphics drawn by the computer are clear, intuitive and easy to modify. The most important thing is that after connecting the 3D printer, the wax model can be directly sprayed for subsequent processing.

(2) Free your hands, reduce the constraints of craftsmanship, and provide assistance for design innovation. Traditional jewelry making requires multi-component welding for complex shapes. The process is complicated and labor costs are high. Even some shapes cannot be produced due to process limitations. The layer-by-layer printing manufacturing method of 3D printing technology can print any complex shape. This is not only the improvement of manufacturing technology, but also greatly liberates the constraints of craftsmanship on design and promotes design innovation. In addition, in the past, it took many years of craftsmanship and manual practice to cultivate an excellent starting master. To a large extent, the factory would rely too much on the starting master, which also increased the restraint of production.

(3) Reduce the production cost of complex modeling jewelry. Traditional jewelry processing is mostly manual work, so labor costs need to be considered. For some complex jewelry shapes, if manual work is used, compared with simple jewelry, the labor cost will be very high, so it will cause The market value is also higher than that of simple jewelry. The contemporary design thinking under the values of the modern era has profoundly affected people’s views on value. It is no longer simply the embodiment of craftsmanship and beauty, but more of the value content after design. The selling point of a piece of jewelry, especially commercial jewelry used for mass production, lies more in the design connotation it embodies. If too much additional cost is added to the production, it will affect the overall value of the jewelry and affect the sales^5-6. 3D printing technology can well balance the issues of craftsmanship, complex modeling and product value. Because of its integrated manufacturing method, whether it is simple modeling or complex modeling, the required process technology is the same, but the number of materials is slightly different. That’s it. This technology can play a huge role in both custom jewelry and batch jewelry processing.

(1) Auxiliary molding

Assisted molding refers to the 3D printing technology and other means to help the molding of the work at a certain stage in the jewelry production process. It is mainly used to produce works with high finished product accuracy, low printing cost and large room for manual adjustment. However, in the entire production process, 3D printing technology is only an auxiliary function, which is easily limited by traditional processes.

(2) Direct molding

Direct prototyping means that 3D printing can directly produce a complete work. After the printing materials and scanned content are completed, they are the final work. As long as the finishing work is completed, the final work is completed. It is mainly used to make larger conceptual jewelry works, and the production design is free and not bound by tradition. However, there are few suitable materials, low precision, slow printing speed and high cost, which need to be further improved ^7-8.

(1) Judging from the development status of jewelry design at home and abroad, foreign jewelry design has a long history, and has developed economy, leading productivity, strong design examples, and advanced and active creative thinking. They focus on the use of advanced and rich design methods. Computer-aided design has long been widely used in jewelry design in Europe and the United States, and many 3D drawing software are also designed and developed in Europe and the United States. With its three-dimensional simulation features, virtual design methods, and convenient design modification process, these software can be integrated with jewelry processing and production, which greatly improves the efficiency of jewelry design.

(2) From a market point of view, jewelry is determined to be a luxury item due to its special material. In reality, most of the people who have demand for jewelry are young people who do not have strong spending power. Their spending power is limited but their desire to consume is considerable. If jewelry still maintains its expensive value, it will cause consumption to such a group with a leading consciousness obstacles^9-10. Using 3D printing technology and parametric design can save design and production time, and the production cost of jewelry will be greatly reduced. Designing complex and exaggerated jewelry shapes that meet the tastes of modern young consumers will greatly improve to stimulate young consumers.

(3) From the perspective of sales model, jewelry can be roughly divided into two categories: custom jewelry and commercial jewelry. Custom jewelry is generally designed according to the specific needs of the buyer. The shape, craftsmanship and material of the jewelry can reach a high level, and the cost is very high. Commercial jewelry is mostly factory assembly line operation and mass-produced. This kind of jewelry is generally more common in shape, and it is a common style. It has no new ideas and lacks creativity. Generally, metals such as gold and silver are used or matched with gemstones. Most of the people who buy it are public. Traditional jewelry design and manufacturing methods are difficult to achieve such customization requirements, but if parametric design is used for jewelry design, multiple design schemes can be quickly generated for selection, effectively saving design costs; cooperate with 3D printing technology to carry out The manufacture of complex shapes not only does not increase production costs, but also has fast production speed, high product precision, cost savings, production time and can improve product quality, whether it is large-scale production or customized production. Lian’s custom jewelry is not a problem.

(4) From the artistic expression of jewelry, modern jewelry is not only used as body decoration, but also can give people the resonance and experience of the soul. At present, more and more artists, under the influence of their respective cultural backgrounds, use jewelry as a carrier to express their emotions and perceptions of society, art and life. They seek various breakthroughs in terms of materials, design intentions, forms of expression, and production techniques. Jewelry is no longer simply a worn object, or its value is determined according to its material. Today’s jewelry, as a medium for the wearer and the viewer to express each other, far exceeds its role in expressing status. For us, contemporary jewelry not only has the basic function of decoration, but has gradually evolved into a medium for the balance and integration of art, craftsmanship, technology, ideology, culture and life. People pay more and more attention to the relationship between jewelry and the human body, the relationship with sports, and the relationship with social life, and more and more new technologies are used in jewelry creation^11-12.

(1) Contour recognition

The contour recognition is carried out by the relationship of its circumscribed rectangle, without intersection judgment, and the method is simple. Apply the following relationships:

The coordinate value of the lower left corner of contour A is V1 (Xmin, Ymin), and the coordinate value of the upper right corner is V2 (Xmax, Ymax). The coordinate value of the lower left corner of contour B is V1 (Xmin’, Ymin’), and the coordinate value of the upper right corner is V2 (Xmax’, Ymax’).

(2) Fill scan

The final path planning is fill scan, the most commonly used is line scan. Draw the equidistant parallel lines of the scan line on the contour plane, then calculate the intersection of the parallel line and the contour, and connect the intersection points according to certain rules to form a fill scan. Assuming that the scan line is parallel to the x-axis, the scan spacing is △y, the maximum value of the contour line in the y-axis direction is ymax, and the minimum value is ymin, then the scan line can be described as the following equation:

where i=1, 2, 3, …., n, and n = (y_max – y_min)/∆y.

(1) Liquid photosensitive resin material

The main components of photosensitive resin are oligomers, photoinitiators, diluents, etc. It is composed of polymer monomers and prepolymers. The photosensitive resin has a relatively rapid curing speed, and the photosensitive resin also has the characteristics of high strength, high temperature resistance, water resistance, etc., which makes it have a smoother appearance and low odor after molding. The photosensitive resin materials we usually see include somos NEXT material, somos 11122 material, epoxy resin, etc. somos NEXT material has good toughness, strong rigidity, exquisite craftsmanship and precise shape; somos 11122 material is like transparent plastic, stable and waterproof; epoxy resin material is used to make extremely precise rapid casting molds.

(2) Nylon powder material

The nylon material applied to 3D printing is a white powder, and the jewelry printed with it is relatively light, heat-resistant, friction-resistant, and wear-resistant. Due to the small diameter of its powder particles, the model made with it is relatively accurate, and the 3D printed nylon jewelry can have high tensile strength without special treatment. However, nylon material has no characteristics in appearance color, but its appearance color can be enriched by spray painting, dip dyeing, etc.

(1) The main application methods of computer technology in rapid prototyping plate making

There are two main ways of rapid prototyping plate making, one is high-precision curing molding; the other is CNC engraving and milling. The application process of computer technology is divided into pre-processing model data output, data input, typesetting, processing file output, rapid prototyping plate making and model post-processing.

(2) Core technology and parameter requirements in relevant links