Ejection refers to the separation of a casting from the die casting mold (Fig. 1) or a die, the separation of the core from the core box during core filling, the separation of a foamed lost-foam castingpattern from the foaming mold by moveable ejector pins or ejector sleeves.

The ejector pins push the respective part against the shrinking or adhesive forces from the mold wall to provide it for discharge for further process steps. Ejection may also be realized in two steps or pulses to ensure that the part does not need to be released from the mold manually or by means of a extractor unit (quick ejection or two-step ejection).

  • Fig. 1: Ejection of a die cast part1) Mold closed, 2) Mold open and ejector retracted, 3) Separation of the casting from the mold wall and ejection of the casting by extending the ejector pinsSource: Fondeurs de France