casting_fundamentals - MEGR 2180 The Great Buddha of...

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MEGR 2180 The Great Buddha of Kamakura C ti F d t l Casting Fundamentals A bell for the Pennsylvania State House was cast in London England however London, England, however, it cracked soon after it arrived in Philadelphia. Muzzle of 3 inch Parrott Rifle, Model of 1863
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MEGR 2180 Metal Casting Processes Foundries Single Crystal G i Permanent Mold Expendable mold Growing Microelectronics Turbine blades Directional Solidification Composite Mold Slush Pressure Die Centrifugal Sand Shell Expended polystyrene Plaster Squeeze Ceramic Investment
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MEGR 2180 METAL CASTING PROCESSES Casting is a solidification process where the molten t i l i d i t ld d th ll d t material is poured into a mold and the allowed to “freeze” into the desired shape Casting dates from 4000BC Economical for relatively short runs as well as high volume Expendable and permanent molds Relatively low accuracy Oft i fi i hi li i ti f Often requires finishing – elimination of sprues, risers, risers, runners etc. Often followed by finish machining
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MEGR 2180 Metal Casting Pure metals – Solidify at constant temperature Alloys S lidif – Produce skin – Columnar grains S f – Solidify over temperature range – Cored dendrites Solidification time Shrinkage and porosity Cored dendrites
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