IE 330 Chapter 11 HW due 2-24-10

IE 330 Chapter 11 HW due 2-24-10 - 11.13 What are some of...

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Amanda Herrin Chapter 11 Review Questions: 1, 7, 8, 9, 13 Multiple Choice Questions: 1, 2, 4, 6, 7, 8, 12, 13, 15, 16 Problems: 1, 16, 17 11.1 Name the two basic categories of casting processes? (1) expendable mold processes (2) permanent mold processes. 11.7 What are the most common metals used in die casting? zinc, tin, lead, aluminum, brass, and magnesium. 11.8 Which die casting machines usually have a higher production rate, cold-chamber or hot-chamber, and why? Hot-chamber machines are faster because cold-chamber die casting machines require molten metal to be ladled into the chamber from an external source. 11.9 What is flash in die casting? Flash is a thin portion of metal at the exterior of a casting that results from molten metal being squeezed into the spaces between the die halves of the mold at the parting line, or into the clearances around the cores and ejector pins.
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Unformatted text preview: 11.13 What are some of the general defects encountered in casting processes? Name and briefly describe three. (1) misruns - the casting solidifies before filling the mold cavity; (2) cold shuts - two portions of metal flow together but there is lack of fusion at the joint (3) cold shots - solid globules of cast metal become entrapped in the casting (4) shrinkage cavity - a depression on the casting surface or an internal void in the casting caused by solidification shrinkage (5) microporosity - a network of small voids throughout the casting caused by localized solidification shrinkage (6) hot tearing - a crack in the casting caused by a mold that does not yield to the metal during the early stages of solidification shrinkage 1) d 2) a 4) b 6) c, e, f, h 7 ) b 8) e 12) a, d, f 13) a, b, d, f 15) c 16) c...
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