Abstract

The objective of this paper is to study gating system design effect onAl-5%Mg
alloy Microstructure Measurement (By Jeffrece's Method) and freezing range,
two sand mould were made with different gating systems Practicality (in Runner
length & Runner depth) to study the effect on freezing ratio & Microstructure, a
VBA Program was bulid because Most of result are stored in Microsoft Excel
2007Spread Sheet in which Calculation of Grain size were performed for many
specimens ,Results shown that the gating system with runner length 2.5 cm and
taper sprue gave better results than gating system with a 4cm runner's length and
cylindrical sprue .