ass2-2010 (1)

# ass2-2010 (1) - sectional area at the base of the sprue is...

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Faculty of Engineering & Applied Science, UOIT ENGR3190U: Manufacturing and Production Processes Assignment #2 – October 2, 2010 Due Thursday October 7 in class. Late assignments are 25% off first day, 50% off second day and 100% off third day. Please slip under my office door. Problem 1 – Chapter 10 A disk 50 cm in diameter and 5 cm thick is to be cast of pure aluminum in an open mold casting operation. The melting temperature of aluminum = 660°C and the pouring temperature will be 750°C. Assume that the amount of aluminum heated will be 8% more than what is needed to fill the mold cavity. Compute the amount of heat that must be added to the metal to heat it to the pouring temperature, starting from a room temperature of 25°C. The heat of fusion of aluminum = 389.3 J/g. Other properties can be obtained from Tables 4.1 and 4.2 in the text. Assume the specific heat has the same value for solid and molten aluminum. (6 marks) Problem 2 – Chapter 10 The downsprue leading into the runner of a certain mold has a length = 185 mm. The cross-
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Unformatted text preview: sectional area at the base of the sprue is 400 mm 2 . The mold cavity has a volume = 0.002 m 3 . Determine (a) the velocity of the molten metal flowing through the base of the downsprue, (b) the volume rate of flow, and (c) the time required to fill the mold cavity. (6 marks) Problem 3 – Chapter 10 In casting experiments performed using a certain alloy and type of sand mold, it took 165 sec for a cube-shaped casting to solidify. The cube was 40 mm on a side. (a) Determine the value of the mold constant the mold constant in Chvorinov's Rule. (b) If the same alloy and mold type were used, find the total solidification time for a cylindrical casting in which the diameter = 30 mm and length = 55 mm. (10 marks) Problem 4 – Chapter 11 An aluminum-copper alloy casting is made in a sand mold using a sand core that weighs 22 kg. Determine the buoyancy force in Newtons tending to lift the core during pouring. (5 marks)...
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