As part of a project, students have been asked to cast an Aluminium disc for use as a flywheel. The flywheel is part of an engine development project and needs to be 200 mm in diameter and 20 mm thick. Green sand casting will be used. The shrinkage associated with this metal and process is 5 % at the solidification stage and further 3% on cooling to room temperature. Aluminum has a density of 2710 kg/m³ and a melting temperature of 660°C. The pouring temperature is 700°C while the specific heat of aluminum is 887 J/kg.K. The latent heat of fusion of Aluminum is 396 kJ/kg. From previous experiments the Chorinov constant for the mold was found to be 10 s/mm². Determine: a.) The dimensions of the pattern (diameter and thickness) that will need to be made for this part (ignore riser and sprue). b.) The time it will take for complete solidification of the part. c.) Assuming an electric furnace at 10% efficiency is used to heat the metal and it takes around 2 hours achieve pouring temperature - what is the cost of energy usage in this process? [Take unit electricity cost as $0.34]

As part of a project, students have been asked to cast an Aluminium disc for use as a flywheel. The flywheel is part of an engine development project and needs to be 200 mm in diameter and 20 mm thick. Green sand casting will be used. The shrinkage associated with this metal and process is 5 % at the solidification stage and further 3% on cooling to room temperature. Aluminum has a density of 2710 kg/m³ and a melting temperature of 660°C. The pouring temperature is 700°C while the specific heat of aluminum is 887 J/kg.K. The latent heat of fusion of Aluminum is 396 kJ/kg. From previous experiments the Chorinov constant for the mold was found to be 10 s/mm². Determine: a.) The dimensions of the pattern (diameter and thickness) that will need to be made for this part (ignore riser and sprue). b.) The time it will take for complete solidification of the part. c.) Assuming an electric furnace at 10% efficiency is used to heat the metal and it takes around 2 hours achieve pouring temperature - what is the cost of energy usage in this process? [Take unit electricity cost as $0.34]

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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