This document discusses rapid prototyping processes. It classifies rapid prototyping into three categories: subtractive, additive, and virtual. Additive processes build parts in layers using techniques like stereolithography, selective laser sintering, and fused deposition modeling. Rapid prototyping allows for faster and more economical manufacturing of prototypes than traditional methods. It has applications in manufacturing, tooling, and casting.

1. UNIT-IV
Rapid Prototyping
Operations
3ME4A
Er. Mohit Ostwal
Assistant Professor
Department of Mechanical Engineering
Jodhpur Institute of Engineering and Technology, Jodhpur

2. Rapid Prototyping
• Prototyping 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.

3. Classification of RP processes
1. Subtractive
2. Additive
3. Virtual

4. Subtractive Processes
• Material removal from workpiece – Larger than final part.
• Computer based technologies to speed up the processes
• Following are essential technologies:
1. Computer based drafting packages
2. Interpretation software's
3. Manufacturing software's
4. CNC Machinery

5. Additive Processes
• Build parts in layers.
• Tessellat ion is piecewise approximation of surfaces of CAD model
by using series of triangles.

6. Additive Processes
1. Liquid based: Stereolithography
2. Powder based: Selective Laser Sintering
3. Solid based: Fused Deposition Modeling, Laminated Object
Manufacturing etc.

7. Stereolithography
Example:- Computer mouse model

8. Stereolithography

9. Selective Laser Sintering

10. Selective Laser Sintering

11. Fused Deposition Modeling
• ABS – Acrylo Butadiene
Styrene/PVC/Nylon/Polyester/Polystyrene/Epoxy etc.

12. Fused Deposition Modelling

13. Laminated Object Manufacturing
Example:- Crankshaft model

14. LOM

15. Virtual Prototyping
• Software form of prototyping
• Advanced technology
• Used by CAD Packages to render a part

16. Applications
• Manufacturing and tooling
• Plastic mold parts
• Vacuum casting
• Metal spraying
• Casting
• Sand casting
• Investment casting
• Die casting
• EDM electrodes
• Master models

17. RP Products