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3D Printing

All about 3D printing...its techniques and working
by

Anik Sachdeva

on 26 February 2011

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Transcript of 3D Printing

3D Printing Group Members:
Anik Sachdeva
Anik Ralhan
Amit Jindal
Aman Mukhija History Originally developed at the Massachusetts Institute of Technology (MIT) in 1993, Three-Dimensional Printing technology (3DP™)
Introduction 3D printing is a method of converting a virtual 3D model into a physical object.
3D printing is a category of Rapid prototyping Technology.
3D printers typically work by 'printing' successive layers on top of the previous to build up a three dimensional object.
They are generally faster, more affordable and easier to use than other additive fabrication technologies.
Rapid prototyping takes virtual designs,
transforms them into into thin cross-section &
then creates physical cross-section in space
until the model is finished. A comparison of two ceramic art objects.
The original was created by John Balistreri 
and then duplicated using a 3D scanner 
and printed using 3D ceramic rapid prototyping. What exactly is 3D printing?? 3D printing consist of an inkjet printing system.
Layers of a fine powder are selectively bonded by "printing" an adhesive from the inkjet print head in the shape of each cross-section as determined by a CAD file.
It is also recognized as the fastest method.
These Photopolymer Phase machines use an ultraviolet (UV) flood lamp mounted in the print head to cure each layer as it is deposited.
Steps In 3D Printing 1.As the gantry moves left to right, the roller collects powder.
2.The roller spreads a thin layer of powder over the build piston.
3.The roller discharges excess powder down the powder overflow shaft.
4.As the gantry moves right to left, the print assembly prints the part cross-section.
5.The feed piston moves up one layer, and built piston moves down one layer, & the process is repeated.
Components of 3D process 3D printing Rapid prototyping?? The most frequently used technologies for rapid prototyping belong to the Aggregation group, with the power-based devices as the most recent developments.
A thin layer of a powder, such as starch, plaster, photopolymer or metal, is deposited onto a building platform.
The regions of the layer that are to become part of the model are fixed by selective spraying of an adhesive, by polymerization with an UV light beam, or by local heating with a laser beam (selective laser sintering).
When the first layer has been fixed the second layer is deposited, and so on, until the final layer is accomplished.
After completion of the model the loose powder is removed by shaking or with the help of an air jet. Working Post Processes 1.Remove the model
from build box 2.Remove excessive
powder 4. Apply additional binder 3.Dry the printed model inside the oven. Advantages Clean process. Wastage of material is negligible.
Complex shape can be produced.
No need of any machining process.
No skilled person needed.
Cheaper process than any other process.
Good for job production. Disadvantages Slow! Adding material is much slower than removing it.
Speed scales very poorly with resolution: double resolution and decrease speed by 8x.
Laser 3D methods faster (than other heads) for equivalent resolution, but limited materials Used in education to produce models.
Can be in medical to produce cells & organs
Used for producing testing specimen.
The technology also finds use in the jewellery, footwear, industrial design, architecture, engineering and construction (AEC), automotive, aerospace, dental and medical industries
Design visualization ,Prototyping/CAD,
Metal casting, architecture, education, geospatial, healthcare and entertainment/retail.
Reconstructing fossils in paleontology, replicating ancient and priceless artifacts in archaeology,
Reconstructing bones and body parts in forensic pathology and reconstructing heavily damaged evidence acquired from crime scene investigations. Applications Small shot glass
Toothed Gear
Small wine glass
Mighty RepRap Power Ring
Coat hook
Car dash phone/iPod bracket
Door handle
Child's shoes What objects have been printed? Thank You
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