• Welcome to engineeringclicks.com
  • 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

      Joined:
      Sep 2016
      Posts:
      2
      Likes Received:
      0
      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?
       

      Attached Files:

      Last edited by a moderator: Sep 10, 2016
    2.  
    3. Erich

      Erich Well-Known Member

      Joined:
      Feb 2012
      Posts:
      242
      Likes Received:
      2
      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

      Joined:
      Sep 2016
      Posts:
      2
      Likes Received:
      0
      Thank you for your reply.
      But the traditional lifter isn't useful due to the layout of the mold
       
    5. Plastec01

      Plastec01 New Member

      Joined:
      Sep 2016
      Posts:
      1
      Likes Received:
      0
      That part was made with a expanding core.
      Roehr makes them.
       
    6. Clara King

      Clara King New Member

      Joined:
      Dec 2016
      Posts:
      1
      Likes Received:
      0
      I know that there are some experts at http://www.plasticsuk.com/ who would know all about this. Might be worth checking them out!
       

    Share This Page