casting_fundamentals

casting_fundamentals - MEGR 2180 The Great Buddha of...

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MEGR 2180 The Great Buddha of Kamakura Casting Fundamentals A bell for the Pennsylvania State House was cast in ondon 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 Permanent Mold Expendable mold Growing Microelectronics Turbine blades irectional Solidification Composite Mold Directional Solidification Slush Pressure Die Centrifugal Sand Shell Expended polystyrene Plaster Squeeze Ceramic Investment
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MEGR 2180 ETAL CASTING PROCESSES METAL CASTING PROCESSES • Casting is a solidification process where the molten material is poured into a mold and the allowed to “freeze” into the desired shape asting dates from 4000BC Casting dates from 4000BC • Economical for relatively short runs as well as high volume • Expendable and permanent molds • Relatively low accuracy Often requires finishing – elimination of sprues, risers, risers, runners etc. ften followed by finish machining Often followed by finish machining
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MEGR 2180 Metal Casting • Pure metals – Solidify at constant temperature • Alloys p – Produce skin – Columnar grains – Solidify over temperature range ored dendrites Solidification time • Shrinkage and porosity Cored dendrites
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MEGR 2180 ast Cast structures Schematic illustration of three cast structures solidified in a square mold: (a) pure metals; (b) solid solution alloys; and (c) structure obtained by using nucleating agents. Source : G. W. Form, J. F. Wallace, and A. Cibula, Figure 10.1 Kalpakjian
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MEGR 2180 ast Cast structures Internal structure of a ast metal bar showing cast metal bar showing the chill zone and the periphery, columnar grains growing toward the center, and a central shrinkage cavity
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MEGR 2180 Solidification Time • The solidification time is a function of the
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This note was uploaded on 10/01/2009 for the course MEGR 2144 taught by Professor Sharpe during the Fall '08 term at UNC Charlotte.

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casting_fundamentals - MEGR 2180 The Great Buddha of...

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