Rapid prototyping (RP) is an advanced manufacturing technology developed in the 1990s, which plays a positive role in promoting product innovation, shortening the development cycle of new products and improving product competitiveness. Since the technology came out, it has been widely used in the manufacturing industry of developed countries, and a new technology field has emerged.

外观设计很多产品特别是家电产品和汽车等对外形的美观和新颖性要求极高。传统检验外形的方法是将产品图形显示于计算机终端，但经常发生“画出来好看而做出来不好看”的现象。采用RP技术可以很快做出原型，供设计人员和用户审查，使得外形设计及检验更直观有效快捷。

The appearance design of many products, especially household appliances and automobiles, has high requirements for the appearance of beauty and novelty. The traditional method of shape inspection is to display the product graphics on the computer terminal, but the phenomenon of "drawing looks good but making looks bad" often occurs. Using RP technology can quickly make the prototype for designers and users to review, making the shape design and inspection more intuitive, effective and fast.

设计检查以模具制造为例，传统的方法是根据几何造型在数控机床上加工，这对于一个价值数十万乃数百万元的复杂模具来说风险太大，设计上任何不慎反映到模具上就是不可挽回的损失。RP方法可在开模前真实而准确地制造出零件原型，设计上的各种细微特征和错误就能在模型上一目了然地显示出来，这就大大减少了修模和开模风险。

Design inspection takes mold manufacturing as an example. The traditional method is to process on the numerical control machine according to the geometric modeling, which is too risky for a complex mold worth hundreds of thousands or even hundreds of thousands of yuan. Any careless reflection on the design to the mold is an irreparable loss. RP method can truly and accurately produce prototype parts before mold opening, and all kinds of subtle features and errors in design can be clearly displayed on the model, which greatly reduces the risk of mold repair and mold opening.
              

功能测试设计者可以利用原型快速进行功能测试以判明是否满足设计要求，从而优化产品设计。如风扇、风鼓等的设计，可获得非常好的扇叶曲面、低噪音的结构等。

Functional test designers can use the prototype to quickly perform functional test to determine whether it meets the design requirements, so as to optimize the product design. For example, the design of fan and air drum can obtain very good blade surface and low noise structure.

可触摸性通过原型，人们能触摸和感受实体，这对照相机、手握电动工具的外形设计极为重要，这一点在人机工程应用方面 具有广泛的意义。

Touchability through the prototype, people can touch and feel the entity, which is very important for the shape design of cameras and hand-held electric tools, which has a wide range of significance in the application of ergonomics.

装配干涉检验在有限空间内的复杂系统，对其进行装配干涉检验是极为重要的。原型可以用来做装配模拟，观察工件之间如何配合、如何相互影响。如汽车发动机上的排气管，由于安装关系极其复杂，通过原型装配模拟可以一次成功地完成设计。

Assembly interference inspection is a complex system in limited space, so it is very important to carry out assembly interference inspection. Prototype can be used for assembly simulation to observe how the workpieces cooperate and interact with each other. For example, the exhaust pipe of automobile engine, because of its complicated installation relationship, can be successfully designed at one time through prototype assembly simulation.

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