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Thee process in which metal powders are compacted into desired and often complex shapes and sintered (heated without melting) to form a solid piece.
Particle size is controlled by this process of passing the metal powder through sieves of various mesh sizes. Achieved by using a verticle stack of screens, with the mesh size becoming finer as the powder flows downward.
Ratio of the largest dimension to the smallest dimension of the particle.
The ratio of the surface area of the particle to the volume
The step in which the blended powders are
pressed into various shapes in dies
The process whereby green compacts are heated in a
controlled atmosphere furnace to a temperature below the melting point, but
sufficiently high to allow bonding of the individual particles.
consists of a computer-controlled extruder
through which a polymer filament is deposited to produce a part slice by slice.
involves a computer-controlled laser-focusing system that
cures a liquid thermosetting polymer containing photosensitive curing agent.
use mechanisms similar to ink-jet printer heads to eject
photopolymers to directly build prototypes.
Multijet and polyjet modeling
uses a laser beam or vinyl cutter to first cut the slices on
paper or plastic sheets. Then it applies an adhesive layer if
necessary, and finally it stacks the sheets to produce the part.
uses and ink-jet mechanism to deposit
liquid droplets of the liquid binder onto polymer, metal, or ceramic powders.
uses a high-powered laser beam to sinter powders
or coatings on the powders in a desired pattern.
Selective laser sintering
in which the workpiece is rotated and a cutting tool removes a layer of material as the tool moves to the left
in which the cutting tool moves radially inward and separates the right piece from the bulk of the blank
in which a rotating cutting tool removes a layer of material from the surface of the workpiece
in which a rotating cutter travels along a certain depth in the workpiece and produces a cavity.
usually formed with ductile materials that are machined at high cutting speeds and/or high rake angles.
consists of layers of material from the workpiece that gradually are deposited on the tool tip
built-up edge chips
semicontinous chips with large zones of low shear strain and small zones of high shear strain
consists of segments that may be attached firmly or loosely to each other
impact due to interrupted cutting, as in turning a splined shaft on the lathe
cyclic variations in the temperature of the tool in interrupted cutting
occurs on the relief face of the tool.
It is generally attributed to (a) rubbing of the tool along the machined
surface, thereby causing adhesive or abrasive wear and (b) high temperatures,
which adversely affect tool-material properties.
Most significant factors influencing " " are (a) the
temperature at the tool-chip interface and (b) the chemical affinity between
the tool and workpiece materials.
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