This ppt includes time compressive manufacturing technologies without using anyy tools and fixtures.

1. An Introduction to
RP Processes
BY
Anand Khare 142110001
Arun Pandaran 142110002

2.  RP can be defined as the process of manufacturing physical
object layer by layer manner directly from their CAD model
without any human intervention and without using any tools,
dies, fixtures, etc.
 RP process belong to the generative (or additive) production
processes.
 In all commercial RP processes, the part is fabricated by
deposition of layers contoured in a (x-y) plane two
dimensionally.
 The third dimension (z) results from single layers being stacked
up on top of each other, but not as a continuous z-coordinate.

3.  Part complexity.
 Material.
 Part quantity.
 Part quality.
 Cost.

4. Increasing number of variants of products.
Increasing product complexity.
Production time is reduced.
Form- fit-function test.
Assembly can be made without joints.

6.  Limited material option.
 Inaccurate surface finish.
 High Cost.
 Limited size of prototypes.
 Need for support structures.

7.  Generation of CAD model.
 Conversion into .stl file.(Tessellation)
 Slicing.
 Generation of physical model.
 Post processing.

8. a) CAD model
b) .stl file or tessellation
c) Slicing

9.  Generation of physical model.

10. Post processing.
 Removal of supports.
 Cleaning of part (wiping, rinsing, ... )
 Post curing.
 Surface finishing.

12. Solid based
• Laminated object manufacturing.
• Selective laser sintering.
• 3D printing.
Liquid
based
• Fuse deposition modeling.
• Stereo lithography.
• Solid ground curing.

14.  Developed by Stratasys, USA.
 Material used ABS(Acryonitrile Butadine Styrene), WAX.
 Accuracy 0.127 mm
Robotically guided fiber extrusion.

18. Strengths
 No post curing is required.
 Variety of materials can be used.
 Little wastage of material.
 Material has large shelf life.
Weakness
 Surface finish is poor.
 Strength is low in vertical direction
 Accuracy is less compared to other RP processes.

20.  Developed by Cubic Technologies, Carson, CA (former
Helisys).
 Material used plastic, paper.
Accuracy 0.076 mm
Basic manufacturing approach-
 Cut and Paste approach.
 Paste and cut approach.

24. Decubing Grid Cutting

25. Strengths
 Prototyping time is proportional to surface area.
 Cost of machine is one of the lowest.
 Material used are least expensive.
Weakness
 Parts are weak in Z direction.
 Prototype (paper) may absorb moisture.
 Decubing is time consuming.
 Laser spends more time in cutting the grids than useful part contours.

26.  Developed by Daimler Chyrsler in collaboration with
IIT Bombay.

28. • Rapid prototyping is a new tool, which used
appropriately ...
– allows the manufacturing enterprise to run smoother
– increases production rate and product quality
•New uses and applications are discovered everyday
• Future areas include new materials directly deposited
(metals, ceramics)

29.  K.P. Karunakaran:” Rapid Product Development and
Manufacturing”, IIT Bombay, Chapter no. 15-16.
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