30-01-2012, 01:03 PM
RAPID PROTOTYPING
arun.docx (Size: 313.48 KB / Downloads: 88)
Introduction:
Rapid prototyping is the fabrication of parts from CAD data sources. Several rapid prototyping methods have been created to produce objects of complex geometries in a relatively short amount of time. Rapid prototyping allows design challenges to be determined earlier in the design process, saving time and money. The technology of rapid prototyping is easy to access and simple to understand.
Description:
To begin the process, the powder delivery system is moved up a set distance permitting a layer of material powder to be created in the fabrication chamber by the roller. The function of the roller is to distribute and compress the powder evenly in the fabrication chamber. The multi-channel jetting head then creates a layer of liquid adhesive in the geometry of the part in the bed of powder. A layer of the part geometry is created when the powder that containing liquid adhesive bonds and hardens.
When a layer is completed, the fabrication piston will move down in increments. These increments are specified to determine the layer thickness.
Advantages:
• Fast Fabrication
• Low Material Cost
• Variety of Colors
• No external supports are required
Disadvantages:
• Resolution
• Surface Finish
• Fragility
Description:
The fused disposition modeling process uses plastic filament that is 1/16” in diameter and stored on a coil. Material that is fed from a hopper in the form of pellets is an option in some low cost configurations. The entire system is enclosed in an oven chamber to control of the process temperature. The system operates best slightly under the melting point of the plastic.
The nozzle is able to move in the X and Y directions and is mounted to a stage system. Layers are formed by very small beads of plastic being deposited from the nozzle in the shape of the part geometry. The plastic beads begin harden immediately after being extruded from the nozzle in addition to bonding with the layer beneath.
Advantages:
Good layer bonding with ABS materials
Fast small part production
Good for parts with thin walls
Usage of water soluble materials allows support structures to be easily removable.
Disadvantages:
• Slow production rates for thick sectioned parts.
• Secondary operations are needed to remove support structures.
• Poor surface finishes.
arun.docx (Size: 313.48 KB / Downloads: 88)
Introduction:
Rapid prototyping is the fabrication of parts from CAD data sources. Several rapid prototyping methods have been created to produce objects of complex geometries in a relatively short amount of time. Rapid prototyping allows design challenges to be determined earlier in the design process, saving time and money. The technology of rapid prototyping is easy to access and simple to understand.
Description:
To begin the process, the powder delivery system is moved up a set distance permitting a layer of material powder to be created in the fabrication chamber by the roller. The function of the roller is to distribute and compress the powder evenly in the fabrication chamber. The multi-channel jetting head then creates a layer of liquid adhesive in the geometry of the part in the bed of powder. A layer of the part geometry is created when the powder that containing liquid adhesive bonds and hardens.
When a layer is completed, the fabrication piston will move down in increments. These increments are specified to determine the layer thickness.
Advantages:
• Fast Fabrication
• Low Material Cost
• Variety of Colors
• No external supports are required
Disadvantages:
• Resolution
• Surface Finish
• Fragility
Description:
The fused disposition modeling process uses plastic filament that is 1/16” in diameter and stored on a coil. Material that is fed from a hopper in the form of pellets is an option in some low cost configurations. The entire system is enclosed in an oven chamber to control of the process temperature. The system operates best slightly under the melting point of the plastic.
The nozzle is able to move in the X and Y directions and is mounted to a stage system. Layers are formed by very small beads of plastic being deposited from the nozzle in the shape of the part geometry. The plastic beads begin harden immediately after being extruded from the nozzle in addition to bonding with the layer beneath.
Advantages:
Good layer bonding with ABS materials
Fast small part production
Good for parts with thin walls
Usage of water soluble materials allows support structures to be easily removable.
Disadvantages:
• Slow production rates for thick sectioned parts.
• Secondary operations are needed to remove support structures.
• Poor surface finishes.