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1_rp_background.20090812.4a8381624b7a84.12803908

1_rp_background.20090812.4a8381624b7a84.12803908 - ME350...

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ME350 - Rapid Prototyping Background Information 1 Overview 1.1 Background This laboratory will introduce you to a technology called Rapid Prototyping. Rapid Prototyping can be defined as a group of techniques used to quickly fabricate a scale model of a part or assembly using computer aided design (CAD) data. There are several advantages (as well as limitations) with these techniques as compared to more traditional subtractive processes, such as milling or turning. In rapid prototyping, the machine reads in data from a CAD drawing, and lays down successive layers of liquid or powdered material, and in this way builds up the model from a series of cross sections. These layers, which correspond to the virtual cross section from the CAD model, are glued together or fused (often using a laser ) automatically to create the final shape. The primary advantage to this type of “additive” construction is its ability to create almost any geometry (excluding trapped negative volumes). The word "rapid" is relative: construction of a model with contemporary machines typically takes 3 to 72 hours, depending on machine type and model size. Used in micro technologies "rapid" is correct, the products made are ready very fast and the machines can build the parts in parallel. Some major techniques of rapid prototyping are Fused Deposition Modeling (FDM), Stereolithography (SL) using Stereolithography Apparatus (SLA), and photopolymer jetting using Objet Eden 350. (Reference: http://en.wikipedia.org/wiki/Rapid_prototyping ) 1.2 Definition of Rapid Prototyping In the manufacturing arena, productivity is achieved by guiding a product from concept to market quickly and inexpensively. Rapid Prototyping technology aids this process. It automates the fabrication of a prototype part from a three-dimensional (3D) CAD drawing. This physical model conveys more complete information about the product earlier in the development cycle. Rapid Prototyping can be a quicker, more cost-effective means of building prototypes as opposed to conventional methods. 1
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ME350 - Rapid Prototyping Background Information The new Rapid Prototyping technologies are additive processes. Liquid RP methods can be categorized by material: photo-polymer, thermoplastic, and adhesives. Photo-polymer systems start with a liquid resin, which is then solidified by exposure to a specific wavelength of light. Thermoplastic systems begin with a solid material, which is then melted and fuses upon cooling. The adhesive systems use a binder to connect the primary construction material. Rapid Prototyping systems are capable of creating parts with small internal cavities and complex geometries. Also, the integration of Rapid Prototyping and compressive processes has resulted in the quicker generation of patterns from which molds are made.
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