Injection Molding
By: Kimberlee Marsh
Steps for Injection Molding





Clamping
Injection
Cooling
Mold-opening
Ejection
Materials



Nylon
Styrene
Ethylene
Pressure Calculation
P=F/A
EX: 10^2 mold
200 ton machine
200/10 = 20 tons/in^2 = 40 ksi
Complications




Burned or scorched parts
Warpage
Surface imperfections
Incomplete cavity filling
Advantages and
Disadvantages





High Production
Tight Tolerancing
Low Labor Costs
Minimal Scrap
No Part Finishing


Expensive Equipment
Running Costs
References
-http://en.wikipedia.org/wiki/Injection_molding
-http://www.efunda.com/
-http://claymore.engineer.gvsu.edu/jackheod/manufact/manufact-213.html
Magnets &
Electromagnets
By: Jennifer Hensley
History of Magnets


The ancient Greeks and Chinese are credited as the first to
find and use a naturally occurring iron ore -magnetite- attracts
other materials containing iron.
When stones similar to magnetite, are freely suspended in the
air they have a tendency to be in the north and south
direction.
SI Units
 Magnetic field strength unit is the tesla
 Unit of total Magnetic Flux is the weber
 1 weber = 1 tesla flowing through 1 square meter
(For a magnetic flux density to equal 1 tesla, a force of 1 newton must
act on a wire of 1 meter in length, carrying 1 amp of current)
Materials
 Magnetic materials are attracted by a magnet,
such as iron, steel, nickel, and cobalt (ability to
become magnetized).
 Nonmagnetic materials such as paper, wood,
glass, or tin, which are not attracted by magnets, are
considered nonmagnetic and cannot become
magnetized.
 Natural Magnets are magnetic stones such as
those found by the ancient Greeks.
Permanent Magnets
 When a material is placed into a strong magnetic field and will
begin to show a magnetic field of it's own, but also continue to
show a magnetic field once removed from the original field.
 All magnets have at least two poles one north pole and at one
south pole.
Electromagnets
 The simplest form of an electromagnet, is a wire that
has been coiled into one or more loops. This coil is
known as a soleniod
 If the wire is wrapped around a core it gives off a
stronger field and the thicker the core also makes a
stronger field
 The more wraps of the wire gives greater magnetic
force
Pros and Cons
 Permanent magnets do not rely upon outside influences to
generate their magnetic field.
 Electromagnets rely upon electric current to generate a
magnetic field, when the current increases, so does the field.
 In applications where a variable magnetic field is not
required, permanent magnets are generally superior.
 Permanent magnets can be manufactured to produce
stronger fields than any electromagnet of similar size.
Demo
References



http://en.wikipedia.org
http://ditc.missouri.edu/designTasks/electorMagn
et/magElec.html
http://education.jlab.org
3D Model
Kimberlee Marsh
&
Jennifer Hensley
Good VS. Bad
Kim’s Blade FEA
Jennifer’s Button FEA
Just for fun FEA
Any ?’s