LECTURE 1 & 2 Flashcards
What does CNC stand for?
Computer Numerical Control
What does DFMA stand for?
Design for Manufacturing and Assembly
What are metals with high melting points called?
REFRACTORY METALS (Tungsten)
Manufacturing originally meant
Made by Hand
Manufacturing now means
Made by machine
For a product to be manufactured, it must be
Made by a machine in quantity
Modern prototyping facilities are called
Makerspaces, because production quantity is low
A car is
Assembled from manufactured parts
A design should be manufacturable with
the least possible operations, simplest operations possible
Stock Material
created by refining and processing raw material into a more convenient form
Bar Stock or Barstock
rods of solid cross-section, such as round, half round, square, rectangular, hexagonal, octagonal, and triangular
Strip Stock
the special case where a rectangular cross-section is thin and wide
Pipe Stock
the special case where the hollow rod has a circular cross-section
Structural Stock
Solid rods of compound cross-sections, such as I-Section, T-section, Angle and Channel.
Used primarily for building structures, such as bridges, chassis or gantry, etc.
Rail Stock
a special case of structural stock intended as rails for wheels or rollers. Used for locomotive tracks and overhead cranes.
Wire Stock
wire-based material, such as rope, cable, and mesh. Used for nails, springs, chain, fencing, concrete reinforcing, etc.
Sheet/Plate Stock
thin and wide material. Regarded as sheet if flexible enough to coil, or plate if shipped in flat stacks
A design should utilize
standard stock material, materials that are compatible with the manufacturing
Manufacturing is
the manipulation of materials
Material Selection includes
Mechanical properties
weight
corrosion
tribological properties
thermal properties
electric/magnetic properties
acoustical properties
appearance
Amorphous Metals
Liquid metal, a metal with a non-crystalline structure, very hard and scratch resistant but brittle
Post-transition metals
Al, Ga, In, Sn, TI, Pb, Bi, Po
Metalloids
On the border between metals to non-metals. B, Si, Ge, As, Sb, Te, Po
Sn
Tin, latin for Stannum, ductile and low strength, corrosion-resistant, non-toxic.
During bending, you can hear a “tin cry”
Pewter is made of
Sn (Tin) +Sb (Antimony) + Cu (copper)
Pb
Lead, Pb stands for Plumbum, dark grey-silver color, toxic, malleable, corrosion resistant
well-suited for bullets
Bi
Bismuth, iridescent-silver color: crystalline
Zn
Zinc, blush-silver color: satin sheen, somewhat brittle, poor corrosion, toxic only if swallowed, not used in its pure form
An alternative name for pot metal
monkey metal
Mg
Magnesium, gray-white-silver color: mirror gloss, light, alkaline-earth metal, non-toxic, reactive, poor corrosion resistance
Al
Aluminum, light-grey-silver color: satin sheen, moderate strength, good corrosion resistance, good conductivity (thermal & electrical), non-toxic, inexpensive
Duralumin
Al (~95%) + Cu (4-5%)
Cu
Copper, Orange-red color: metallic, ductile, good corrosion resistance, excellent conductivity, moderately expensive, toxic to microbes
Brass
an alloy of Cu+Zn
Bronze
an alloy of Cu + Sn
Ag
Silver, silver color: lustrous, anti-microbial uses, superior conductivity & reflectivity
Ni & Co
Nickel and Cobalt
Soft magnetic alloys
Ni + Co + Fe
Ti
Titanium, high strength/weight, best corrosion resistance, expensive, lower stiffness than steel
Refractory metals
Nb (nobium), Mo (molybdenum), W (tungsten)
W
Tungsten, non-toxic, weighs the same as gold
