Question

Why large or complex castings require multiple in-gates?

(a) To make smooth surface finish of the casting

(b) To make uniform flow

(c) To have high strength of the casting

(d) To have good toughness of the casting

This question was addressed to me in examination.

The above asked question is from Gating Design in division Pattern and Mould, Principles of Gating & Risering of Casting-Forming-Welding I

Answer 1

Correct answer is (b) To make uniform flow

To explain: Large or complex castings require multiple in-gates to completely fill all the sections of the castings effectively. Runner area is also reduced after each in-gate, such that restriction on the metal flow would be provided to make more uniformity in the metal flow.