2. (a) Describe, using illustrations the main features of sand-casting mould and explain the purpose of the gating syste

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2 A Describe Using Illustrations The Main Features Of Sand Casting Mould And Explain The Purpose Of The Gating Syste 1 (72.15 KiB) Viewed 13 times

2. (a) Describe, using illustrations the main features of sand-casting mould and explain the purpose of the gating system, cores, and vent. [5 marks] (b) A sprue is 150mm long and has a diameter of 100mm at the top, where the metal is poured. If a flow rate of 80,000 mm3/s is to be achieved, what should be the diameter of the bottom of the sprue to prevent aspiration? What is the resultant velocity and Reynold number at the bottom of sprue if the metal being cast is aluminium and has viscosity 0.004 Ns/m2? [15 marks] Total marks: 20