Question: Question 1 Describe TWO (2) differences between expendable and permanent moulds. (b) Discuss the production sequence of sand casting starting from sand preparation until finished.

Question 1

  1. Describe TWO (2) differences between expendable and permanent moulds.

(b) Discuss the production sequence of sand casting starting from sand preparation until finished.

(c) The design of the gating system should aim at provision a defect free casting product. Discuss the requirements.

(d) In the casting of steel under certain mold conditions, the mold constant in Chvorinov's

rule is known to be Cm= 3.0 min/cm, based on previous experience. The casting is

a flat plate whose length = 250 mm, width = 15 cm, and thickness = 25 mm. Determine how long it will take for the casting to solidify. Take n = 2

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