机械工程英语第二版part2unit11翻译.docVIP

机械工程英语第二版part2unit11翻译 机械工程英语（第11单元） Rapid Prototyping and Manufacturing Technologies快速原型制造和快速制造技术 Introduction介绍 Manufacturing community is facing two important challenging tasks：（1）Substantial reduction of production development times; and (2) Improvement on flexibility for manufacturing multi-variety and small batch-size products. Computer-aided design and manufacturing (CAD and Cam) have significantly improved the traditional production design and manufacturing. However, there are a number of obstacles in true 制造社会面临两个重要的艰巨任务：1大幅度减少产品开发时间，以及改善对弹性制造多品种，小批量大小的产品。电脑辅助及制造大大改善了传统的生产设计和制造。但是，有一个数字障碍计算机辅助设计与真正的一体化电脑辅助制造新产品的快速发展。 To substantially shorten the time for developing patterns, and prototypes, some manufacturing enterprises have started to use rapid prototypes(RP)methods for complex patterns making and component prototyping. Over the past few years, A variety of new rapid 料去除工艺制作的，也就是说，零件首先通过几何建模软件，比如一个实体建模模块来建模，然后用数学的方法进行切层处理，使其成为一连串平行的横截面片。每件，固化或具有约束力的路径生成。这些固化或具有约束力路径是直接用于指导生产的部分机器固化或具有约束力的材料一致。建成后，一层是，一个新的层是建立在以同样的方式前一个。因此，该模型建立一层一层从底部到顶部。 RR Processes RP反相进程 As mentioned earlier, there are several technologies available for model production based on the principle of “growing” or “additive” manufacturing. The major differences among these technologies are in two aspects (1) Materials used, and (2) Part building techniques. The following sections will explain in detail these rapid prototyping technologies with respect to the above two aspects. 如前所述，有几种技术可以为模型生产的基础上，增加或添加剂生产原则。这些技术之间的主要分歧是在两个方面;材料使用，而部分建筑技术。以下部分将解释快速原型技术，这些细节就上述两项方面。 1.Stereo lithography光固化 Stereo lithography apparatus (SLA) was invented by Charles Hull of 3D Systems Inc. It is the first commercially available rapid prototype and is considered as the most widely used prototyping machine. The material used is liquid pho-to-curable resin, acryl ate (monomers) are polymerized into large molecules. Based on this principle, the part is built in a vat of liquid resin as shown in Figl.1. 光固