UNIT-IV Rapid Prototyping Operations

UNIT-IVRapid Prototyping Operations3ME4AEr. Mohit OstwalAssistant ProfessorDepartment of Mechanical EngineeringJodhpur Institute of Engineering and Technology, Jodhpur

Rapid PrototypingPrototyping is an early sample, model, release of a product built to test a concept or process or to act as a thing to be replicated or learned.Rapid prototyping is layer by layer material deposition fastest and economical and less time consuming method for manufacturing of prototypes.

Classification of RP processesSubtractiveAdditiveVirtual

Subtractive ProcessesMaterial removal from workpiece Larger than final part.Computer based technologies to speed up the processesFollowing are essential technologies:1. Computer based drafting packages2. Interpretation software's 3. Manufacturing software's4. CNC Machinery

Additive ProcessesBuild parts in layers.Tessellat ion is piecewise approximation of surfaces of CAD model by using series of triangles.

Additive ProcessesLiquid based: Stereolithography

2. Powder based: Selective Laser Sintering

3. Solid based: Fused Deposition Modeling, Laminated Object Manufacturing etc.

Stereolithography

Example:- Computer mouse model

Stereolithography

Selective Laser Sintering

Selective Laser Sintering

Fused Deposition ModelingABS Acrylo Butadiene Styrene/PVC/Nylon/Polyester/Polystyrene/Epoxy etc.

Fused Deposition Modelling

Laminated Object Manufacturing

Example:- Crankshaft model

LOM

Virtual PrototypingSoftware form of prototypingAdvanced technologyUsed by CAD Packages to render a part

ApplicationsManufacturing and toolingPlastic mold partsVacuum castingMetal sprayingCastingSand castingInvestment castingDie castingEDM electrodesMaster models

RP Products