Rapid Prototyping Operations
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projectsofme
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04-10-2010, 01:02 PM



.pdf   RP.pdf (Size: 596.63 KB / Downloads: 206)
Rapid Prototyping Operations

INTRODUCTION

It is common practice in process design, plant monitoring and long-term planning to use steady state process simulations. Such simulations often are done in the form of flowsheet simulations, where process equipment is represented by unit operations; these unit operations are linked together to form a complete process model by means of material-, energy- and information-streams. The unit operation models are combined in a Process Flow Diagram, showing streams connecting the unit operations. A central facility for thermodynamic property calculations is underlying the individual unit operation calculations. This approach ensures thermodynamic consistency across each of the sub-models that make up the complete flowsheet model. Flowsheet simulations are commonly performed in specific simulation applications or simulation environments. Typically, an industrial end-user (e.g. a chemical company) has contracts with one or more simulation software vendors, and use of simulation packages is standardized within the company to a few simulation packages. The primary reason that a company utilizes multiple simulation packages is that some packages specialize in a particular area of process simulation. Also, the company may need to validate simulation results across multiple simulation packages, to ensure that the simulation results do not depend on the software that is used. The paper proposes a method for rapid prototyping (RP) fractal geometry represented objects. RP technology has made possible the physical fabrication of solid freeform objects. However, contemporary CAD/CAM/RP systems are developed for Euclidean geometry and are incapable of handling self-similar fractal objects (e.g. jewelry products). To address the problem, a Radial-Annular Tree (RAT) data structure is proposed to represent Iterated Function Systems (IFS) fractal curves. RP toolpaths can then be generated from the RAT data structure. Geometry modeled in the RAT data structure can also be combined with Euclidean geometry from traditional CAD systems to make aesthetic patterns for the jewelry industry.


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24-03-2012, 01:26 PM

Rapid prototyping


.ppt   RIPED PROTOTYPE.ppt (Size: 1.73 MB / Downloads: 69)


Technology which considerably speeds the iterative product development process

Classification of Rapid Prototyping

Rapid prototyping is classified to 3-major groups

Subtractive ( Removal of material )

Additive ( Adding of material )

Virtual ( Advanced computer base visualization)

Additive Process

Build parts in layer by layer (slice by slice as stacking a loaf of bread)


The computational steps in producing a stereolithography file a) Three dimensional description of part b)The part is divides into slices (only one in 10 is shown) c)support material is planned d)A set of tool directions is determined to manufacture each slice. Shown is the extruder path at section A-A from c) For a fused-deposition-modeling operation

Fused Deposition Modeling

A gantry robot controlled extruder head moves in two principle directions over a table

Table can be raised or lowered as needed

Thermo plastic or wax filament is extruded through the small orifice of heated die

Initial layer placed on a foam foundation with a constant rate

Extruder head follows a predetermined path from the file

After first layer the table is lowered and subsequent layers are formed



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