Rapid prototype paper

[B][COLOR="Red"]Rapid prototype paper[/COLOR][/B]

[B]ABSTRACT:[/B]

Rapid prototyping describes a category of techniques well suited to quick construction of newly designed parts. Typically in additive processes the parts are built bottom-up by adding subsequent thin layers that are essentially stacked cross sections of the part. This process is still less than a decade old, but already it is finding applications that make it economical. One the other hand the subtractive processes, such as milling are well established and understood. The trend to data has been for prototyping methods to focus on only one of the two philosophies. This paper describes a method that uses both additive and subtractive approaches. The parts are made using thick layers of a support matrix, such as wax, to support the work. NC milling techniques are sued to cut pockets into the matrix. These pockets then act as mould for a poured polymer. The successive addition of layers leads to very fast and flexible part manufacturing.

[B]INTRODUCTION :[/B]

Rapid prototype manufacturing processes have become popular topics in manufacturing. They are also known as free form fabrication we can say that they are not methods of replacing tradition manufacturing technologies but they can fill a well recognised need for production of prototype parts and tooling. We can also describe. These process as techniques to turn a computer band design file into a physical geometry within short period. For example of a useful application is that an injection mould die having complicated shapes, designed and produced using a steriolithography machine. The polymer based part can be given a spray metal coating and used to turn out a few sample injection complicated parts, investment casting war cores(4) for traditional processes the time frame was month, but with rapid prototyping methods it can be done in days.

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