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Test 1 DFM
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39
Aerospace Engineering
Pre-School
02/28/2012

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Cards

Term
What is the modulus of elasticity of steel
Definition
30 Mpsi, 207 GPa
Term
What is the density of steel?
Definition
.283 lb/in3, 7.8 g/cm3
Term
What are the relative cost per volume, stiffness, and specific weight for cold drawn steel
Definition
1.3,1,1
Term
What are the relative cost per volume, stiffness, and specific weight for Aluminum
Definition
2,1/3,1/3
Term
What are the relative cost per volume, stiffness, and specific weight for brass?
Definition
10,1/2,1.15
Term
What are the relative cost per volume, stiffness, and specific weight for ti alloys
Definition
35,1/2,1/2
Term
What are the relative cost per volume, stiffness, and specific weight for magnesium
Definition
2.3,1/5,1/5
Term
what are the responsibilities of a design engineer
Definition
reliability,functionality,durability, Manufacturability, cost, aesthetics
Term
What are the responsibilities of Manufacturing Engineers?
Definition
Provide manuf. Wherewithal, ensure design is satisfactory from manufacturing standpoint
Term
who invented the assembly line
Definition
olds
Term
DFM definer and when
Definition
Boltz in the mid 1980s
Term
how much cost committed in design phase and incurred in design phase?
Definition
70% and 5%
Term
What kind of engineering developes a successful product faster and with less money?
Definition
concurrent
Term
good and bad of hot rolled steel
Definition
cheap
dimensional variation, rough surface,poorer straightness
lower strength, poorer machinability
Term
hot rolled steel, machining, Forming, Welding,
Definition
100 tons, poor, average, good
Term
good and bad of cold steel
Definition
Higher cost, better everything else
Term
cold steel, machining, Forming, Welding,
Definition
better everything but welding. Great for stamping.
Term
Stainless Steels
Definition
Corrosion resistant, cold and hot forming, hard to machine, ok to weld
Term
Aluminum
Definition
light, corrosion resistant, conductive, strength varies. very good at all applications except salt water and Brazing
Term
Copper and Brass
Definition
very dense, conductive, corrosion resistant, weldable, good all around, great for springs, forming over machining
Term
Magnesium
Definition
very light, very good machinability, good for low weight low stress.
Term
Zinc
Definition
Heavy, moldable, great for coatings, casting
Term
Titanium
Definition
expensive, very difficult to process.
Term
Thermosets vs Thermoplastics
Definition
-chem reaction, under heat, permanent
-soften with heat, molded and remolded
Term
Elastomers
Definition
rubbers
Term
Carbon
Definition
graphite, ceramics w/ conductivity,
Term
ceramics and glasses
Definition
hard brittle, strong, heat+corrosion resistant, insulators.
Term
Tungsten Carbide
Definition
Powered metal process, cutting tools,
Term
Silicon Carbide
Definition
Fluid seals, automobile parts, electronic components
Term
Extrusion
Definition
Constant cross section, long, 6.3mm-1.02 m diameter
min- 1000kg steel, 500kg ss, 80kg al
cross sec dim- .5-1.6mm
Term
Stamping
Definition
sheet metal, needs ductility, simple geometry, short run production, .25mm-20mm, progressive- 250,000, conventional-10,000. almost all mat. .005-.01 in tolerance
Term
Fine-Blanking
Definition
better than stamping, .45 μm, gears, 25-250 mm usually. .8-8mm thick, Chamfers, and die roll, 10-20 thousand parts. Steel!
Term
Roll Form
Definition
25-400mm, steel al brass bronze copper and zine, 100,000 ft, .25-.8 mm tolerances, low draft and no blind corners.
Term
Powder Metallurgy
Definition
no machining or scrap, great tolerances, controlled permeability, high volume production, <150 mm, >20,000 parts best for 100,000, .0-.13 mm before repress, .013-.05 tolerances after. avoid draft,
Term
Spun-Metal
Definition
sheet metal and rollers, symmetric circular parts, <5000 parts, al copper, steel,
Term
Cold Headed/upsetting
Definition
50mm diameter, .5mm 3.2 kg. Good for fasteners, malleable metals used. 25-50 thousand min parts.
Term
Impact or cold extruded
Definition
impact- non ferrous
Term
Impact or cold specs
Definition
120,000 parts per month all materials,
Term
Metal Injection
Definition
PM with finer metals, any sidewalls, 100 mm max dimension, .5-50 g, 10,000 parts per year min. all materials,
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