Application and development of the hottest rapid p

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The application and development of rapid prototyping technology

1 preface

rapid prototyping (RP), also known as rapid prototyping manufacturing (RPM) technology, was born in the late 1980s. It is a high-tech manufacturing technology based on material stacking method, and is considered to be a major achievement in the manufacturing field in the past 20 years. It integrates mechanical engineering, CAD, reverse engineering technology, layered manufacturing technology, numerical control technology, material science and laser technology. It can automatically, directly, quickly and accurately transform design ideas into prototypes with certain functions or directly manufacture parts, thus providing an efficient and low-cost means for prototype production of parts and verification of new design ideas. That is, rapid prototyping technology is to use three-dimensional CAD data to stack layers of materials into solid prototypes through rapid prototyping machines

rp technology has obvious advantages: it can directly accept product design (CAD) data and quickly manufacture samples, molds or models of new products without preparing any molds, cutters and tooling fixtures. Therefore, the popularization and application of RP technology can greatly shorten the development cycle of new products, reduce the development cost and improve the development quality. From the traditional "removal method" to today's "growth method", from mold manufacturing to mold free manufacturing, this is the revolutionary significance of RP technology to the manufacturing industry

2 background of RP technology

(1) with the formation of global market integration, the competition in manufacturing industry is very fierce, and the speed of product development has increasingly become the main contradiction. In this case, the ability (cycle and cost) of independent rapid product development (rapid design and rapid tooling) has become the strength basis of the global competition in the manufacturing industry

(2) in order to meet the changing needs of users, the manufacturing industry requires strong flexibility in manufacturing technology, which can be produced in small batches or even single pieces without increasing the cost of products. Therefore, the speed of product development and the flexibility of manufacturing technology are very critical

(3) from the perspective of technological development, the development and popularization of computer science, CAD technology, material science and laser technology have laid a technological material foundation for the emergence of new manufacturing technology

3 basic principle of RP technology

rapid prototyping technology is a technology that uses different methods to stack materials based on the principle of discrete and stacking under the control of computer, and finally completes the forming and manufacturing of parts. From the perspective of forming, parts can be regarded as the superposition of "points" or "faces". Get the geometric information of "point" or "surface" discretely from the CAD electronic model, and then combine it with the information of forming process parameters to control the regularity and precision of materials. Why does Ningbo Council for the promotion of international trade make great efforts in the field of new materials? The reason is to accurately stack parts from point to surface and from surface to body. From the perspective of manufacturing, it generates three-dimensional geometric information of parts according to CAD modeling, controls multi-dimensional system, and forms prototypes or parts by stacking materials layer by layer by laser beam or other methods

4 process characteristics of RP technology

since its inception, RP technology has developed rapidly in a short period of more than ten years, showing strong vitality, and has many advantages over traditional processing methods. Its characteristics are mainly as follows:

(1) the most prominent advantage of high flexibility RP technology is high flexibility. It uses non-contact processing, and can quickly form with certain accuracy and strength without any tools Prototypes and parts that meet certain functions. If you want to modify parts, you only need to modify the CAD model, which is especially suitable for single piece small batch production

(2) rapidity it usually takes only a few hours to dozens of application hours from CAD design to prototype production. Compared with traditional processing methods, the processing cycle is saved by more than 70%, especially for complex parts

(3) highly integrated RP technology is an advanced manufacturing technology integrating computer, CAD/CAM, numerical control, laser, material and machinery. The whole production process is automated and digitalized, which is directly related to CAD model. Parts can be modified and manufactured at any time, realizing the integration of design and manufacturing

(4) low cost has nothing to do with the complexity of the product. The general manufacturing cost is reduced by 50%, which is especially suitable for the development of new products and the production of single small batch parts

(5) strong adaptability. It is suitable for processing parts of various shapes. The manufacturing process has nothing to do with the complexity of the parts and is not limited by tools. It can realize free form fabrication. The prototype has high reproducibility and interchangeability, especially when machining complex surfaces, it can better reflect its advantages, which is unmatched by traditional methods

(6) the universality of materials. There is no limit to the materials used in rapid prototyping. All kinds of metal and non-metal materials can be used, and resin, plastic, paper, paraffin, composite materials, metal materials and ceramic prototypes can be made

5 application of RP technology

continuously improving the application level of RP technology is an important aspect to promote the development of RP technology. At present, rapid prototyping technology has been widely used in industrial modeling, machinery manufacturing, aerospace, military, architecture, film and television, home appliances, light industry, medicine, archaeology, culture and art, sculpture, jewelry and other fields. And with the development of this technology itself, its application field will continue to expand. The practical application of RP technology mainly focuses on the following aspects:

(1) the application of rapid prototyping technology in the process of new product modeling design has established a new product development mode for industrial product designers and developers. Using RP technology can quickly, directly and accurately transform the design idea into a physical model (sample) with certain functions, which not only shortens the development cycle, but also reduces the development cost, and also enables enterprises to take the lead in the fierce market competition

(2) application in the field of mechanical manufacturing due to its own characteristics, RP technology has been widely used in the field of mechanical manufacturing, mostly for the manufacture of single piece and small batch metal parts. For some special complex parts, because they only need to be produced in a single piece or a small batch of less than 50 pieces, RP technology can generally be used for direct molding, with low cost and short cycle

(3) rapid tooling manufacturing traditional tooling has long production time and high cost. Combining rapid prototyping technology with traditional mold manufacturing technology can greatly shorten the development cycle of mold manufacturing. China's universal tensile testing machine has a broad market prospect and improves productivity. It is an effective way to solve the weak links of mold design and manufacturing. The application of rapid prototyping technology in mold manufacturing can be divided into direct mold making and indirect mold making. Direct mold making refers to the use of RP technology to directly stack and manufacture molds. Indirect mold making refers to the first production of rapid prototyping parts, and then the required molds are copied from the parts

(4) application in the medical field in recent years, people have done more research on the application of RP technology in the medical field. Based on medical image data, using RP technology to make human organ models has great application value for surgery

(5) application in the field of culture and art in the field of culture and art, rapid prototyping manufacturing technology is mostly used for artistic creation, cultural relics replication, digital sculpture, etc

(6) application in the field of aerospace technology in the field of aerospace, aerodynamics ground simulation experiment (i.e. wind tunnel experiment) is an essential and important link in the design of advanced space to earth system (i.e. space shuttle). The model used in this experiment has complex shape, high accuracy requirements, and streamlined characteristics. Using RP technology, according to the CAD model, RP equipment automatically completes the solid model, which can well ensure the quality of the model

(7) application in home appliance industry at present, rapid prototyping system has been popularized and applied to a great extent in the domestic home appliance industry, making many home appliance enterprises in the forefront of China. Such as: Guangdong Midea, Huabao, Kelon; Cymbidium and cygnet in Jiangsu; Haier and others in Qingdao have successively adopted rapid prototyping system to develop new products, and achieved good results. Rapid prototyping technology is widely used. It is believed that with the continuous maturity and improvement of rapid prototyping manufacturing technology, it will be popularized in more and more fields if the suction pressure is evacuated and applied

6 development direction of rapid prototyping technology

from the current research and application status of RP technology, the further research and development work of rapid prototyping technology mainly includes the following aspects:

(1) develop rapid prototyping materials with good performance, such as forming materials with low cost, easy forming, small deformation, high strength, durability and no pollution

(2) improve the processing speed of RP system and develop the process method of concurrent manufacturing

(3) improve the reliability of rapid prototyping system, improve its productivity and manufacturing capacity of large parts, optimize the equipment structure, especially improve the accuracy, surface quality, mechanical and physical properties of formed parts, so as to provide a basis for further mold processing and functional experiments

(4) develop high-performance RPM software for rapid prototyping. Improve the speed and accuracy of data processing, research and develop the method of direct slicing using CAD raw data, and reduce the accuracy loss caused by STL format conversion and slicing processing

(5) develop new forming energy

(6) improvement and innovation of rapid prototyping methods and processes. Direct metal forming technology will become another hot spot of research and application in the future

(7) research on the integration of rapid prototyping technology with CAD, CAE, RT, CAPP, cam, high-precision automatic measurement and reverse engineering

(8) improve the research of networking services and realize remote control

7 conclusion

in a word, rapid prototyping technology is a new forming method. Although it came out soon, it has been widely used in many fields of the national economy and has brought huge economic benefits to many industries. With the increasingly fierce market integration competition, new product development and production cycle are required to be shorter and shorter, which brings a broad space for the production and development of rapid prototyping technology. RP technology will be adopted by more and more enterprises, play a more and more important role in the development of enterprises, and will bring rich returns to enterprises, and its own development will also be greater. At the same time, rapid prototyping technology, as a multidisciplinary professional technology, its own development will also promote the development of related technologies and industries. (end)

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