Part Ejection in Magnesium High Pressure Die Casting

One important process step in Magnesium HPDC (High Pressure Die Casting) is the ejection of part from the mold. Due to solidification and cooling down the part shrinks onto the mold. To overcome the strong forces that hold the part on the mold, ejection pins are used that push the part outside. Often the number of ejection pins is exaggerated since it is currently difficult to estimate if a reduced number could already be sufficient to eject the part without actually trying it. Reducing the number of ejection pins would decrease production costs and also give more flexibility to the mold maker to set cooling channels since these are occupying the same design space as the ejection pins.