Abstract
The relationship between the coefficient of discharge and the gating system for the metal mold casting of cast iron was studied.
It was shown that the coefficient of discharge varies as much as the variation in the length or the sectional area of the gate. When L/D was defined as followed, it was found that the coefficient of discharge is a function of L/D :
L/D=Ls/Ds+Lr/Dr+Li/Di
where L is the length of gate, D is the equivalent diameter of gate, and subscripts s, r and i refer to sprue, runner and ingate, respectively. Furthermore, an equation for calculating the sectional area of gate for metal mold casting was derived from the coefficient of discharge thus obtained.
