Question

How can we enhance the feeding distance during casting?

(a) Reducing molten metal temperature

(b) Increase fluidity

(c) By using low thermal conductivity mold

(d) Using sand mold

I had been asked this question by my school principal while I was bunking the class.

This interesting question is from Riser Design topic in chapter Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

Answer 1

Correct option is (b) Increase fluidity

The explanation: Feeding distance reduces by reducing molten metal temperature and using a low thermal conductive mold. For sand casting, feeding distance will be low because heat extracted by sand is very less compared to metals. By increasing fluidity, metal can flow over a long distance which results in higher feeding distance.