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Submitted By PinkPanther9288
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Authors : Ruchita Kulkarni, Kedar Malusare _____________________________________________________________________________

1.1 Rapid prototyping Rapid Prototyping (RP) can be defined as a group of techniques used to quickly fabricate a scale model of a part or assembly using three-dimensional computer aided design (CAD) data. What is commonly considered to be the first RP technique, Stereolithography, was developed by 3D Systems of Valencia, CA, USA. The company was founded in 1986, and since then, a number of different RP techniques have become available. Rapid Prototyping has also been referred to as solid free-form manufacturing; computer automated manufacturing, and layered manufacturing. RP has obvious use as a vehicle for visualization. In addition, RP models can be used for testing, such as when an airfoil shape is put into a wind tunnel. RP models can be used to create male models for tooling, such as silicone rubber molds and investment casts. In some cases, the RP part can be the final part, but typically the RP material is not strong or accurate enough. When the RP material is suitable, highly convoluted shapes (including parts nested within parts) can be produced because of the nature of RP.

Fig 1. Rapid prototyping worldwide

There is a multitude of experimental RP methodologies either in development or used by small groups of individuals. They are listed as given below.     Stereolithography (SLA) Selective Laser Sintering (SLS®) Laminated Object Manufacturing (LOM™) Fused Deposition Modeling (FDM)

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Solid Ground Curing (SGC) Ink Jet printing techniques

1.2 Stereolithography The term stereolithography was coined in 1986 by Charles W. Hull. Stereolithography was defined as a method and apparatus for making solid objects by successively ‘printing’ thin layers of the ultraviolet curable…...

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