Overflows

Overflows are cavities and passages in the die which act as vents for air to escape and traps for excess metal flow.

Overflows reduce/prevent porosity in the die casting and promote complete metal fill into the far sections of the cavity.

For the zinc elbow, the overflows are positioned on the thin section end of the elbow furthest from the inlet gating .

The overflows also use a 1/2 ring geometry (with side tabs) on the thin end to avoid trim blemishes on the visible body of the elbow.