Question: Question # 7 A cylindrical riser will be designed for a sand-casting mold. a) Estimate the time required for a 1m3 cube-shaped The casting itself

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Question \# 7 A cylindrical riser will be designed for a sand-casting mold. a) Estimate the time required for a 1m3 cube-shaped The casting itself is a steel rectangular plate with dimensions of 7.5cm12.5cm2.0cm. Previous observation has indicated that the total solidification time (TST) for this casting is 22min. The cylindrical riser will have a diameter-toheight ratio =1.0. Determine the dimensions of the riser so that its TST=33min. that heat transfer is controlled by conduction through the mold Cm=4(TmellingTmoldbivirialcaucingHcasting)2(kmutumoldCmoll1) For Al: For sand mold: k=2.22W/cmK k=0.0061W/cm.K =2.7g/cm3 =1.7g/cm3 H=398J/g Cp=1.13JggC

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