C4 – Rapid Prototype Manufacture
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Transcript C4 – Rapid Prototype Manufacture
Option C: CAD/CAM
C4 – RAPID PROTOTYPE MANUFACTURE
Wet Rapid Prototyping.
A technique that uses a fluid support structure that
can be washed and drained away.
Stereo Lithography.
Stereo lithography (SLA) is a 3D printing process
that uses a vat of photosensitive resin and a vertically
moving platform.
It uses a laser beam, directed onto the surface of the
photosensitive resin, to print the pattern of the
current model layer by hardening the photosensitive
resin.
The platform then moves down by a layer thickness
so the next layer can be printed.
Dry rapid prototyping.
A technique that uses break-away supports.
Laminated Object Manufacture (LOM).
LOM machines take the sliced CAD data from the 3D
model and cut out each layer from a roll of material,
using a laser or plotter cutter.
These sliced layers are glued together to form the
model, which is either built on a movable platform
below the machine or on pins when using card.
Solid Object Printing.
Solid object printing, in particular wax modelling,
employs inkjet deposition technology.
A linear array of nozzles deposits molten wax on a
platform, layer by layer, to build up the 3D model.
Fuse Deposition Modelling
(FDM).
An FDM machine is basically a CNC robot that holds
a small extrusion head.
The extrusion head moves back and forth along a
platform, building up a 3D model by feeding heated
plastic wire through the extrusion head.
Select Laser Sintering (SLS).
SLS is a 3D printing process based on sintering.
A CO2 laser is used to sinter a thin layer of heat-
fusible powder that gradually builds up the 3D
model.
Compare wet and dry rapid prototype
techniques.
Wet techniques can be used for more intricate
internal construction where it would be difficult to
break away supports.
Dry techniques use a breakaway structure, which can
be difficult to remove from detailed areas.
Benefits of being able to rapid prototype a
product instead of using other CAM techniques.
Consider…
Product design
Speed
Time
Costs
Accuracy
Waste.
Limitations of rapid prototyping
for volume-produced products.
Consider the internal structure of a product, and
number of components.
Rapid prototyping (RP) benefits trials, testing
and final part manufacture
Consider reduced development time and costs, and
user trials.
Compare SLS, LOM and FDM rapid
prototype processes.
Consider…
Speed
Time
Costs
Accuracy
Surface finish.
Describe different design contexts where SLS,
LOM and FDM would be applicable.
Consider…
Quality
Cost
Accuracy of outcome.