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  • plastic part with peripheral undercuts

    Discussion in 'Plastic moulding' started by mahmoud el saeed, Sep 10, 2016.

    1. mahmoud el saeed

      mahmoud el saeed New Member

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      My case is how to eject this injected plastic part from its mold (figure 1 on attached PDF). The critical features in this plastic part are the three peripheral undercuts that need a mechanism for demolding. I noticed in the bottom surface of the part a split lines-the blue lines in figure 2-that is a proof for the ejection mechanism. What is the mechanism that eject the part?
       

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      Last edited by a moderator: Sep 10, 2016
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    3. Erich

      Erich Well-Known Member

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      I think this would be done with a Lifter. The lifter is part of the ejection system. It is an angled motion that moves sideways as the part is ejected.
       
    4. mahmoud el saeed

      mahmoud el saeed New Member

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      Thank you for your reply.
      But the traditional lifter isn't useful due to the layout of the mold
       
    5. Plastec01

      Plastec01 New Member

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      That part was made with a expanding core.
      Roehr makes them.
       

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