MCHE 3920 Shape Casting Exam Questions with Complete Answers Latest Update 2024
what are three main benefits of shape casting - Answers form freedom, certain properties at elevated temperatures, distinct character and texture
what does the liquid metal ooured into a mold create? - Answers negativ...
what are three main benefits of shape casting - Answers form freedom, certain properties at elevated
temperatures, distinct character and texture
what does the liquid metal ooured into a mold create? - Answers negative shape of the product
is it better to fill a mold bottom up or top down and why? - Answers it is best to fill bottom up to prevent
splashing (which creates oxidation and loss of properties) and prevents gas entrapment
why does casting generally have higher alloy content - Answers higher alloy content yields lower
viscosity for better mold filling and low melting temperatures which requires less energy and faster
throughput
casting metals ideally should be near _________ composition - Answers eutectic, which means
homogenous composition and lowest possible melting temperature and typically lower viscosity
what does higher alloy content come at an expense of? - Answers material properties
what material properties are reduced with high alloy content? - Answers toughness, ductility and fatigue
strength
what quality does cast iron have lower relative to low carbon steel? - Answers stiffness
what is a tradeoff of material properties? - Answers castability and high alloy content
why is having a slow filling speed or laminar flow important? - Answers laminar flow minimizes free
surface area and thus minimizes oxidation and loss of material properties
what is used to predict the transition from laminar to turbulent flow? - Answers reynolds number, which
is dependent on geometry and the fluid
what is typically the Reynolds number the transition of laminar to turbulent flow for flow over a flat
plate? - Answers 500,000
what are some tradeoffs for low filling speeds? - Answers lower productivity and cold running
what is cold running? - Answers solidifying portions before mold is filled
how can cold running be prevented? - Answers using thicker parts, results in increased weight and cost
how can filling speeds be increased? - Answers using multiple gates, results in increased required
finishing
mold filling will either be slow at _______ pressure, or fast at _________high pressure - Answers slow at
low pressure, fast at high pressure
what happens to the volume when cooling from liquid to solid? - Answers reduces
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