which casting process is the most suitable for a small number of high quality Wh
ID: 2074109 • Letter: W
Question
which casting process is the most suitable for a small number of high quality Which casting process is the most suitable for a small number of high quality parts for an expensive sports car? (3 marks) (a) (b) Which casting process is the most suitable for a small number of low quality parts for a 'one-off prototype? (3 marks) (c) On the basis of cost, choose between sand casting and lost wax casting: (i) for a small number of parts, (3 marks) and (ii) for a large number of parts (3 marks): (d) Why is the rate of cooling important in metal casting? (3 marks) (e) What sets the upper limit on pouring speed in metal casting? (2 marks) () What might happen if the pouring speed was excessive? (3 marks)Explanation / Answer
A. Investment casting gives the more accurate small parts. It is most expensive when comparing with other casting processes. It require only little surface finish. The parts become more expensive because of the complexity in making them{like artistic features and detailed curved contours}. Good dimensional accuracy smooth surface is desired then we go to investment casting.
B. Die casting is more used in this case because of the parts used as prototype should have utmost accuracy with die casting we can employ main features with accuracy and reduce secondary operations.
C. For both cases we may use sand casting referring to cost. When coming to the wax casting it requires skilled worker and high equipment but in the case of sand casting the making charges and maintenance charges are low. Mold preparation is also cheap.
D. Rate of cooling also known as rate of solidification. This should be taken care because of the solidification of casting the metal should not solidify until it reaches the final part of the casting cavity. So time of Solidification should taken into consideration.
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