Rapid prototyping technology and its application i

2022-05-26
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Rapid prototyping technology and its application in mold manufacturing

this paper discusses the process principle and processing of rapid prototyping technology, and also shows the industrial strength, characteristics, formation and development of Taizhou as the "capital of plastic products" and its application in mold manufacturing. It is pointed out that this technology can form a new processing system with a wide range of applications and broad market prospects

rapid prototyping technology is a new comprehensive manufacturing technology involving many disciplines. After the 1980s, with the application of computer-aided design, the product modeling and design ability have been greatly improved. However, after the product design is completed and before mass production, samples must be made to express the design concept, quickly obtain the feedback information of product design, and evaluate and demonstrate the feasibility of product design. In today's increasingly fierce market competition, time is benefit. In order to improve the market competitiveness of products, the whole process from product development to batch production urgently requires to reduce costs and improve speed. The emergence of rapid prototyping technology provides an effective way to solve this problem, which has attracted much attention at home and abroad

1 basic principle of rapid prototyping technology

rapid prototyping technology is the general name of making product prototype based on the principle of discrete layering. Its principle is: Product 3D CAD model → layered discretization → processing and stacking raw materials layer by layer according to the discrete plane geometric information → generating solid model

this technology integrates computer technology, laser processing technology and new material technology. Relying on CAD software, the three-dimensional solid model is established in the computer and cut into a series of plane geometric information, so as to control the scanning direction and speed of laser beam, and selectively process raw materials layer by layer by means of bonding, fusion, polymerization or chemical reaction, so as to quickly stack and make product solid model

2 processing characteristics of rapid prototyping technology

rapid prototyping technology breaks through the traditional part processing mode of "blank → cutting → finished product", creates a precedent for making parts without tools, and is an unprecedented thin-layer superposition processing method. Compared with traditional cutting methods, rapid prototyping has the following advantages:

(1) it can quickly manufacture free-form surfaces and more complex parts, such as grooves, shoulders and hollow parts in parts, which greatly reduces the development cost and development cycle of new products

(2) it belongs to non-contact processing, which does not need the tools and fixtures necessary for machine tool cutting, and has no influence of tool wear and cutting force

(3) no vibration, noise and cutting waste

(4) fully automatic production at night can be realized

(5) it has high processing efficiency and can quickly make product solid models and molds

the following table shows the comparison between rapid prototyping technology and traditional cutting methods

comparison table between rapid prototyping technology and traditional cutting methods

3 development of rapid prototyping technology

the concept of rapid prototyping technology, that is, RP (rapid, as long as it is reasonable, prototyping technology) can be traced back to 1979, Professor Weixiong Nakagawa of the Institute of production technology of Tokyo University in Japan invented the laminated model modeling method, and xiunan Kobayashi proposed the light modeling method in 1980. After this idea was put forward, The research was continued by Yoji MARUYA in 1984 and the trial production of the product was carried out in 1987

in 1988, 3D systems company of the United States took the lead in launching a practical device for Rapid Prototyping - laser three-dimensional modeling, namely SLA (stereo lightgra plastic granulator industry standard urgently needs to be improved, PHY apparatus), and sold it in the world market with an annual sales growth rate of 30% ~ 40%. In recent years, with the improvement of the performance of scanning galvanometer and the development of material science and computer technology, rapid prototyping technology has become more and more mature, and officially entered the stage of popularization in 1994

according to the different shapes and types of materials used, there are four types of rapid prototyping technology

3.1 optical modeling method using laser curing resin materials

optical modeling device has always been the best SLA product of American 3D systems company, and formed a monopoly market. Its working principle is shown in Figure 1. The ultraviolet light emitted by the laser is combined into a thin beam through the optical system. Under the control of the computer, the beam is selectively scanned. The laser scanning mirror lifting device container photosensitive resin body photosensitive resin surface. Using the mechanism that the photosensitive resin solidifies in the presence of ultraviolet light, the photosensitive resin is solidified layer by layer. After each layer is solidified, the worktable drops by a precise distance, And make the laser scanner scan the liquid level according to the geometric information of the surface of the new layer, so that the new layer of resin is cured and tightly adhered to the cured resin of the previous layer, and repeat until a part solid model is produced. At present, the manufacturing accuracy of laser three-dimensional modeling can reach ± 0.1mm, which is mainly used to provide samples and experimental models for products. In addition, solidform developed by Japanese Imperial machine can directly make injection molding molds and vacuum injection molds

Figure 1 Schematic diagram of three-dimensional light modeling technology

according to the different forms and types of materials used, there are four types of rapid prototyping technology at present

 

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