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  • Help Design Injection Molding Tool/Part.

    Discussion in 'Plastic moulding' started by GregSmith, Nov 18, 2015.

    1. GregSmith

      GregSmith New Member

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      Hello,

      This is the first Injection Molded part that I have been asked to design. So I have very little experience and have been learning most from online/books etc. Please any replies in layman's terms.:)

      I am trying to make an In-Desk power unit (similar to this http://www.hudsonsofficefurniture.c...sockets.aspx?gclid=CPT-x9r1mckCFSQHwwodO0MJaA).

      In the photos I have tried to show the positive negative draft so you have an idea of where I was imagining the split line.
      Note: Sink lines do not visually matter on any of this part. None of this will be visible.

      The main concern of mine is shown in image 'DataClip_DimsD'. Where the tube must have a draft of 0.5 minimum and it continues far down into the tool.
      Will this trap air? It there a way around this?
      Will this be able to be ejected?
      With the tool makers be able to make this?

      There are some photos:
      http://imageshack.com/a/img911/8767/rS4LBb.jpg
      http://imageshack.com/a/img910/7981/gZmMSF.jpg
      http://imageshack.com/a/img633/979/L9zUcz.jpg
      http://imageshack.com/a/img903/2024/6ZmEK3.jpg
      http://imageshack.com/a/img633/6159/b8Mt0r.jpg
      http://imageshack.com/a/img907/8990/mx3rsV.jpg
      http://imageshack.com/a/img908/1235/y7GVvo.jpg
      http://imageshack.com/a/img905/3504/7JB16g.jpg
      http://imageshack.com/a/img907/2029/XotqCk.jpg
      http://imageshack.com/a/img911/5793/lYv48V.jpg
      http://imageshack.com/a/img905/143/KSgsNR.jpg
      http://imageshack.com/a/img907/5909/goRbV0.jpg
      http://imageshack.com/a/img908/4247/0JfmuC.jpg
      http://imageshack.com/a/img907/4842/i1AtTb.jpg
      http://imageshack.com/a/img903/5079/8FTPM5.jpg
      http://imageshack.com/a/img910/3926/9YVEAe.jpg


      Thanks for any help.
      Greg
       
    2.  
    3. CPPMable

      CPPMable Well-Known Member

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      One important question I have before a response is what is the material going to be? Do you have a data sheet? Do you have any idea of where you will be making this part (what company?)? I work for a company who really pushes the needs of injection molding. Almost any vendor I talk to about my parts say they are impossible until I pull a part out of a bag and they are like no way. So vendor is very important but I am not saying your parts are getting that difficult.

      Another question is what type of tolerances do you have on that feature?
       
    4. CPPMable

      CPPMable Well-Known Member

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      Also, if you are not aware at Protlabs.com you can submit designs and have them quoted. Through this process they will check for any bad design or manufacturing issues. You can also request a mold flow analysis which would help answer your above question. However, they use aluminum molds and tend not to push the injection molding boundary much so if no flags show up there it would be a good sign.
       
    5. GregSmith

      GregSmith New Member

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      Thanks for the reply.
      We have not been specified a material. My boss had been talking about ABS or Nylon. The plastic is purely functional and just needs to hold the electrical components inside.
      No, I don't have a data sheet unfortunately. I know very little about that actual technical information.
      The tool is going to be manufactured in China and then shipped over to England where the injecting will be done. This is the main difficulty for me as it is very difficult to communicate with the tool maker.
      (Its worth noting that we have had extremely good quality tools made from this company in the past)(not designed by me).
      I expect we will use an aluminium mold. I know they don't have as long a life span but we are not going to be making millions of these.
      Thanks very much, I didn't know that Protlabs gave a free mold flow analysis :) I'll check it out.
      Thank again for any help/advise you can give. I feel like Im swimming in the deep end here.
       
    6. CPPMable

      CPPMable Well-Known Member

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      Greg,

      One question, have you not had a design review with the company that will do the injection molding on the design? I am not sure how things work in England but all my molders we do a design review and they actually will provide feedback because alot of it hinges on their capabilities and experiences. They also usually help or design the tooling and then send it to a tool manufacture we specify. We do have good relationships with out molders and tool makers since we do $100s of millions in tools and parts per year.

      I have run some parts with similar geometry to what you show in your image in ABS with pretty good results, required fairly high pressure but do able. My design had slightly more of a draft allowing better flow into that cavity.

      I have a couple good injection molding guide lines I will try and dig them up and get them online if possible or find something similar but I would suggest you talk with your molder since I am guessing communication will be easier.
       
    7. Delia Wu

      Delia Wu New Member

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      Hello Greg

      How are you!

      Glad to hear that you are on the marketing for injection mold & die casting mold.

      Camel Engineering Ltd was a Joint Austria & China organization. Professional Mold Manufacturer in Asia for 11 years.

      Our core business : Plastic injection mold / Die casting mold / insert mold / Over mold / Twin-shots mold / Rapid prototype / 3D design / Pre & Mass production .

      Rich experience in plastic/metal parts , If you are interested in. Let’s talk.



      Mit freundlichen Grüßen & Kind regards
      Delia Wu
      Account Engineer
      CAMEL ENGINEERING LIMITED
      "Hier beginnt das Professionelle Service"
      + 43 7675 20491-0 Austria Location
      + 86 755 8455 9450 China Facility
      + 86 18270452617 Cell
      cameleng_12 Skype
      delia@camelengineering.com
      www.camelengineering.com
       
    8. Delia Wu

      Delia Wu New Member

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      Gerg, Nice to know you.. And this is Delia from Camel Engineering Ltd. We have a mold designer team. if you have some issue for the design. we can talk.. my skype: cameleng_12
       

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