Injection speed and filling speed of zinc alloy die-casting process

Design and development of zinc alloy die-casting molds. Die-casting is a precision casting method that uses high pressure to force molten metal into complex-shaped metal molds. It is a precision casting method. Next, I will introduce the jet speed and filling speed of the zinc alloy die-casting process.

1. Shot speed.
Hot chamber die casting machines are designed for secondary shot. The first speed is a slow-speed shot, which makes the molten metal slowly flow to the nozzle to reduce the pressure loss (due to the friction and turbulence between the zinc alloy molten metal and the runner wall), which is conducive to the removal of gas. The second speed is a fast shot that realizes high pressure and high speed filling.
Before filling the cavity, the molten metal is increased from the first speed to the second speed, so that it fills the cavity in the state of atomized flow, and the filling speed of the molten metal must be greater than 35m/s.

Die casting illustration
2. Filling speed.
Filling speed is a key parameter affecting the surface quality of die castings.
According to the continuity principle of metal liquid flow: punch area × punch speed = inner pouring cross-sectional area × filling speed.
V charge = {F charge * V charge}/Ag.
Formula: V is the filling speed of the inner gate (m/s), F is the punch area (CIT12), V is the punch speed (=m/s), and Ag is the cross-sectional area of ​​the inner gate (cm2).
When the filling speed reaches 55m/s, the tensile strength of the die casting is up to 290mpa.
Recommended data: 25-35m/s for thick-walled parts;
Thin-walled parts are 45-60m/s.

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