part 2

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Author:
sivie13
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181903
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part 2
Updated:
2012-11-06 00:00:53
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Midterm exam 2
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  1. Thee process in which metal powders are compacted into desired and often complex shapes and sintered (heated without melting) to form a solid piece.
    Powder Metallurgy
  2. 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. 
    Screening
  3. Ratio of the largest dimension to the smallest dimension of the particle.
    Aspect Ratio
  4. The ratio of the surface area of the particle to the volume
    Shape Factor
  5. The step in which the blended powders are
    pressed into various shapes in dies
    Compaction
  6. 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.
    Sintering
  7. consists of a computer-controlled extruder
    through which a polymer filament is deposited to produce a part slice by slice. 
    fused-deposition modeling
  8. involves a computer-controlled laser-focusing system that
    cures a liquid thermosetting polymer containing photosensitive curing agent.
    Stereolithography
  9. use mechanisms similar to ink-jet printer heads to eject
    photopolymers to directly build prototypes.
    Multijet and polyjet modeling
  10. 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. 
    Laminated-object manufacturing
  11. uses and ink-jet mechanism to deposit
    liquid droplets of the liquid binder onto polymer, metal, or ceramic powders.
    3D printing
  12. uses a high-powered laser beam to sinter powders
    or coatings on the powders in a desired pattern. 
    Selective laser sintering
  13. in which the workpiece is rotated and a cutting tool removes a layer of material as the tool moves to the left
    turning
  14. in which the cutting tool moves radially inward and separates the right piece from the bulk of the blank
    cutting off
  15. in which a rotating cutting tool removes a layer of material from the surface of the workpiece
    slab milling
  16. in which a rotating cutter travels along a certain depth in the workpiece and produces a cavity.
    end milling
  17. usually formed with ductile materials that are machined at high cutting speeds and/or high rake angles.
    continuous chips
  18. consists of layers of material from the workpiece that gradually are deposited on the tool tip
    built-up edge chips
  19. semicontinous chips with large zones of low shear strain and small zones of high shear strain
    serrated chips
  20. consists of segments that may be attached firmly or loosely to each other
    discontinous chips
  21. impact due to interrupted cutting, as in turning a splined shaft on the lathe
    mechanical shock
  22. cyclic variations in the temperature of the tool in interrupted cutting
    thermal fatigue
  23. 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.
    Flank wear
  24. Most significant factors influencing " " are (a) the
    temperature at the tool-chip interface and (b) the chemical affinity between
    the tool and workpiece materials.
    crater wear

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