ashok mule rapid prototyping presentation

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RAPID PROTOTYPING

PRESENTED BY

ASHOK A MULEIND023


INDEX

• Introduction of Rapid Prototyping• Basic principle and methodology• Various Techniques of RP• Applications of RP• Advantages and Disadvantages• Future scope for development


INTRODUCTION

• Prototype – A replica or model for testing conceptualized design

• Manual fabrication and testing is now old practice

• New quick technique- Rapid Prototyping• Definition- A group of techniques used to

quickly fabricate a scale model of a part or assembly using three-dimensional computer aided design (CAD) data.

• Characteristics of RP:1.A RP model free-form manufacturing2.layered manufacturing method(i.e. layer by layer additive process)


Comparison of conventional machining with RP


BASIC PRINCIPLE OF WORKING OF RP

Basic principle involves 5 steps:• Creation of the CAD model of the design • Conversion of the CAD model to STL format

• Slicing the STL file into 2-D cross-sectional layers

• Layer by layer construction

• Cleaning and finishing the model


Creation of the CAD model of the design

•Drafting 3-D model on software•Softwares include CATIA,PRO-E, Auto-Desk etc


Conversion of the CAD model to STL format.•STL (Stereolethography format)

•Surfaces are divided into no. of triangles•Fixing coordinates of the vertices of all triangular parts


Slicing the STL file into thin cross-sectional layers•Slicing the model in layers from 0.01 to 0.7mm

•Generating an auxiliary structure to support the model during the build.


Layer by layer construction of model•Building one layer at a time from polymers, paper, or powdered metal•Layer by Layer completes the whole model


Cleaning and finishing the model

• Removing the prototype from the machine

• Detaching any supports • Cleaning, finishing etc


Complete process of RP


VARIOUS TECHNIQUES OF RP

• Stereo-lithography Process

• Selective Laser Sintering(SLS)

• Laminated Object Manufacturing(LOM)

• Fused Deposition Modeling(FDM)

• 3-D Ink-Jet Printing


Stereolithography Process• Patented in 1986• Solidification of liquid photosensitive polymers when exposed to UV light • Exposing next layer to UV with lowering platform by elevator


Selective Laser Sintering(SLS)

• Patented in 1989 •Powdered materials like nylon, elastomers are used• Sintering of powder takes place when exposed to UV


Laminated Object Manufacturing(LOM)• Developed in 1985 by Hydronetics in

Chicago • Paper laminated with heat-activated glue is used• A focused laser cuts the outline of the first layer into the paper


Fused Deposition Modeling(FDM)

• Developed in 1988 by S. Scott Crump • Feeding thermoplastic filament wire• Deposition of heated plastic layer by layer to complete the part


3-D Printing• Developed in MIT & licensed to Soligen

Corporation,• An ink-jet printing head selectively

deposits(prints) a binder fluid to fuse the powder together in the desired areas.


APPLICATIONS OF RP

• Engineering• Complex parts of Aerospace industries• Rapid Tooling

• Architecture

• Medical Applications• Tooth and bone implants• Hearing instruments

• Arts and Archaeology• Statues and ornaments


ADVANTAGES & DISADVANTAGESAdvantages:

• Faster production of parts• Less expensive• Helps in quick testing of product• Fast error elimination and assists product developments• Low labor cost• Reduction in material cost, waste disposal cost, inventory cost, material transportation cost• Quick design modification• Better communication between the designer and user

Disadvantages:• High machinery cost• Unsuitability to very large product


Future scope for developments in RP

• Improving speed• Improved accuracy and surface finish.• Use of metal and composite materials • Increasing size capacity• Distance Manufacturing on Demand(being

developed by Researchers at UC-Berkeley)


THANK YOU!

ashok mule rapid prototyping presentation

Engineering

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cad model

scale model

layer additive process

layer construction cleaning

d crosssectional layers

powdered metal layer

rp basic principle