Flashcards in Chapter 32 Deck (11):
Define: Rapid Prototyping
or (RP), is a family of technologies used to fabricate engineering prototypes of parts in minimum possible lead time based on computer-aided design (CAD) models.
Define: Material Removal vs. Material Addition RP
Material Removal: Machining, primarily milling and drilling, using a dedicated Computer Numerical Control (CNC) machine that is available to the design department on short notice.
Material Addition: Machines that add thin layers of material one at a time to build the physical part from bottom to top. Helpful for complexity in part geometry.
Define: Geometric Modeling
Modeling the component on a CAD system to define its enclosed volume. Provides exact representation of mass of part.
CAD models converted into a format that approximates its surfaces by triangles, with their vertices arranged to distinguish the object's interior from its exterior.
Model is sliced into closely spaced parallel horizontal layers. Each layer is saved as STL file.
First material addition RP technology, dating back to about 1988. Processes of fabricating a solid plastic part out of a photosensitive liquid polymer using a directed laser-beam to solidify the polymer. Accomplished through a series of layers.
Droplet Deposition Manufacturing; Also known as ballistic-particle manufacturing, operates by melting the starting material and shooting small droplets onto a previously formed layer. Liquid droplets cold weld to the surface to form a new layer.
Laminated Object Manufacturing; produces a solid physical model by stacking layers of sheet stock that are each cut to an outline corresponding to the cross-sectional shape of a CAD model.
Fused Deposition Modeling; an RP process in which a filament of wax and/or thermoplastic polymer is extruded onto the existing part surface from a work head to complete each new layer. Slow Process.
Selective Laser Sintering; uses a moving laser beam to fuse powders in areas corresponding to the CAD geometric model one layer at a time to build the solid part. After each layer is completed, a new layer of loose powders is spread across the surface and leveled using a counter rotating roller.