| Video
of week 4 year 2008 |
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The subject of this
week is continuous casting.
" Casting is a manufacturing process by which
a liquid material is introduced into a mould, allowed
to solidify within the mould, and then ejected or
broken out to make a fabricated part. Casting is used
for making parts of complex shape that would be difficult
or uneconomical to make by other methods, such as
cutting from solid material. Casting may be used to
form hot, liquid metals or meltable plastics (called
thermoplastics), or various materials that cold set
after mixing of components such as certain plastic
resins such as epoxy, water setting materials such
as concrete or plaster, and materials that become
liquid or paste when moist such as clay, which when
dry enough to be rigid is removed from the mold, further
dried, and fired in a kiln or furnace.
Substitution is always a factor in deciding whether
other techniques should be used instead of casting.
Alternatives include parts that can be stamped out
on a punch press or deep-drawn, forged, items that
can be manufactured by extrusion or by cold-bending,
and parts that can be made from highly active metals"
"Wikipedia"
Enjoy the technical video:
http://www.mechanicalengineering.tv/videos/continuous-casting |
| Video
of week 5 year 2008 |
|
The subject of this
week is Powder Metallurgy.
"Powder metallurgy is a forming and fabrication
technique consisting of three major processing stages.
First, the primary material is physically powdered,
divided into many small individual particles. Next,
the powder is injected into a mold or passed through
a die to produce a weakly cohesive structure (via
cold welding) very near the dimensions of the object
ultimately to be manufactured. Finally, the end part
is formed by applying pressure, high temperature,
long setting times (during which self-welding occurs),
or any combination thereof." "Wikipedia"
Enjoy the video:
http://www.sme.org/cgi-bin/get-item.pl?DV03PUB20&2&SME&
|
| Video
of week 6 year 2008 |
|
The subject of this
week is chariot.
"In preparation for the U.S.-led effort to build
a lunar outpost, NASA has completed the first lunar
truck prototype, named Chariot. The vehicle is designed
to meet the payload transport, range, terrain and
speed specifications defined by NASA's Lunar Architecture
Team. This video shows the Chariot climbing a simulated
lunar hill" .
Enjoy the video:
http://chariot.jsc.nasa.gov/videos/vid-5.html
|
| Video
of week 7 year 2008 |
|
The subject of this
week is Blow Molding.
"In Extrusion Blow Molding (EBM), plastic is
melted and extruded into a hollow tube (a parison).
This parison is then captured by closing it into a
cooled metal mold. Air is then blown into the parison,
inflating it into the shape of the hollow bottle,
container or part. After the plastic has cooled sufficiently,
the mold is opened and the part is ejected" "Wikipedia",
"the Video was submitted by Abdullah Al-Dossary
& Abd ALAZIZ Aseeri"
Enjoy the video:
http://www.sme.org/cgi-bin/get-item.pl?DV03PUB21&2&SME&
|
| Video
of week 8 year 2008 |
|
The subject of this
week is Gear Manufacturing.
"A gear is a component within a transmission
device that transmits rotational force to another
gear or device. A gear is different from a pulley
in that a gear is a round wheel which has linkages
("teeth" or "cogs") that mesh
with other gear teeth, allowing force to be fully
transferred without slippage. Depending on their construction
and arrangement, geared devices can transmit forces
at different speeds, torques, or in a different direction,
from the power source. Gears are a very useful simple
machine. The most common situation is for a gear to
mesh with another gear, but a gear can mesh with any
device having compatible teeth, such as other rotational
gears, or linear moving racks.
A gear's most important feature is that gears of unequal
sizes (diameters) can be combined to produce a mechanical
advantage, so that the rotational speed and torque
of the second gear are different from that of the
first. In the context of a particular machine, the
term "gear" also refers to one particular
arrangement of gears among other arrangements (such
as "first gear"). Such arrangements are
often given as a ratio, using the number of teeth
or gear diameter as units." "Wikipedia",
Enjoy the video:
http://www.sme.org/cgi-bin/get-item.pl?DV03PUB29&2&SME&
|
| Video
of week 9 year 2008 |
The
subject of this week is Powder Coating.
"Powder coating is a type of dry coating, which
is applied as a free-flowing, dry powder. The main
difference between a conventional liquid paint and
a powder coating is that the powder coating does not
require a solvent to keep the binder and filler parts
in a liquid suspension form. The coating is typically
applied electrostatically and is then cured under
heat to allow it to flow and form a "skin".
The powder may be a thermoplastic or a thermoset polymer.
It is usually used to create a hard finish that is
tougher than conventional paint. Powder coating is
mainly used for coating of metals, such as "white
goods", aluminium extrusions, and automobile
and motorcycle parts. Newer technologies allow other
materials, such as MDF (medium-density fibreboard),
to be powder coated using different methods."
"Wikipedia"
Enjoy the video:
http://www.sme.org/cgi-bin/get-item.pl?DV03PUB26&2&SME& |
| Video
of week 10 year 2008 |
The
subject of this week is Nuclear Power Plant
"To build a nuclear reactor, what you need is some
mildly enriched uranium. Typically, the uranium is formed
into pellets with approximately the same diameter as
a dime and a length of an inch or so. The pellets are
arranged into long rods, and the rods are collected
together into bundles. The bundles are then typically
submerged in water inside a pressure vessel. The water
acts as a coolant. In order for the reactor to work,
the bundle, submerged in water, must be slightly supercritical.
That means that, left to its own devices, the uranium
would eventually overheat and melt.
To prevent this, control rods made of a material that
absorbs neutrons are inserted into the bundle using
a mechanism that can raise or lower the control rods.
Raising and lowering the control rods allow operators
to control the rate of the nuclear reaction. When an
operator wants the uranium core to produce more heat,
the rods are raised out of the uranium bundle. To create
less heat, the rods are lowered into the uranium bundle.
The rods can also be lowered completely into the uranium
bundle to shut the reactor down in the case of an accident
or to change the fuel…." "how stuff
works? ", AS PER THE REQUEST OF NASSER AL-FRAANAH
Enjoy the video:http://www.dom.com/about/stations/nuclear/nuctour.html |
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| ASM
Newsletter |
| ASM
Quarterly Newsletter will reflect the voice of the local
market needs in terms of material technologies and standards,
and keep you updated with the latest technologies in
Materials. |
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33rd International Symposium for Testing and Failure
Analysis 
