外文中英文翻译快速成型.doc

河南理工大学 本科毕业设计（论文）外文资料翻译 题目：Rapid Prototyping 快速成型 学院: 机械与动力工程学院 专业: 机械设计制造及其自动化 班级: 机制专升本05-1 姓名: 孙 泽 章 学号: 0503050126 指导老师：焦 锋 Rapid Prototyping 1 Rapid Prototyping basic concept Rapid Prototyping is a general term applied to a family of fabrication technologies that allow engineering of solids parts to be made in minimum lead time. The common feature of the rapid prototyping processes is that they fabricate the part directly from the CAD geometric model. This is usually done by dividing the solid object into a series of small thickness and then defining the area shapes of each layer. For example, a vertical cone would be divided into a series of circular layers, each circle becoming smaller and smaller as the vertex of the cone is approached. The rapid prototyping processes then fabricate the object at the base and building each layer on top of the preceding layer to approximate the solid shape. The fidelity of the approximation depends on the thickness of each layer. As layer thickness decreases, accuracy increases. There are a variety of layer-building processes used in rapid prototyping. The most common process, called stereo lithography, uses a photosensitive liquid polymer that cures when subjected to intense light. Curing of the polymer is accomplished using a moving laser beam whose path layer is controlled by means of the CAD model. By hardening each layer, one on top of the preceding, a solid polymer prototype of the part built. Virtual prototyping, based on virtual reality technology, involves the use of the CAD geometric model to construct a digital mock-up of the product, enabling the designer and other to obtain the sensation of the real physical product without actually building the physical prototype. Virtual prototyping has been used in the automotive industry to evaluate new car style designs. The observer of the virtual prototype is able to asses the appearance of the new design even though no physical model is on display. Other applications