Injection Molding

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Injection Molding

• By Kimberlee Marsh

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Steps for Injection Molding

• Clamping
• Injection
• Cooling
• Mold-opening
• Ejection

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Materials

• Nylon
• Styrene
• Ethylene

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Pressure Calculation
PF/A
EX 102 mold 200 ton machine
200/10 20 tons/in2 40 ksi
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Complications

• Burned or scorched parts
• Warpage
• Surface imperfections
• Incomplete cavity filling

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Advantages and Disadvantages

• High Production
• Tight Tolerancing
• Low Labor Costs
• Minimal Scrap
• No Part Finishing

• Expensive Equipment
• Running Costs

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References
-http//en.wikipedia.org/wiki/Injection_molding -h
ttp//www.efunda.com/ -http//claymore.engineer.gv
su.edu/jackheod/manufact/manufact-213.html
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Magnets Electromagnets

• By Jennifer Hensley

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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.

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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)

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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.

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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.

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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

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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.

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Demo
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References

• http//en.wikipedia.org
• http//ditc.missouri.edu/designTasks/electorMagnet
  /magElec.html
• http//education.jlab.org

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3D Model

• Kimberlee Marsh
• Jennifer Hensley

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Good VS. Bad
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Kims Blade FEA
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Jennifers Button FEA
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Just for fun FEA
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Any ?s