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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.
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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
High Production Tight Tolerancing Low Labor Costs Minimal Scrap No Part Finishing Expensive Equipment Running Costs Advantages and Disadvantages
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.
References • http://en.wikipedia.org • http://ditc.missouri.edu/designTasks/electorMagnet/magElec.html • http://education.jlab.org
3D Model Kimberlee Marsh & Jennifer Hensley
