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Ask The Moldflow Experts


Understanding GM's Moldflow Requirements

Ask The Moldflow Experts Webinar Topic:



Understanding GM's Moldflow Requirements

August 17th, 2021 | 12:30 PM CDT


Becoming familiar with GM’s requirements for Moldflow analysis can be a daunting task. Join us as we help you navigate through General Motors’ Appendix E8 manufacturing standards for thermoplastic injection molded parts. As members of GM’s Moldflow Advisory Board, CAE Services is intimately familiar with the process. We have also lived it, having worked on hundreds of GM molds and attended numerous T1 tryouts (too many to count!). Specifically, here is what will be covered:

GMW16355 – Thermoplastic Injection Molding Analysis
  • Why these standards are necessary
  • Personnel required
  • 5 Phases of Moldflow
  • Reporting requirements
 
GMW16365 – Thermoplastic Injection Mold T1 Tryout Protocol
  • Personnel required
  • At the press – detailed procedures
  • Filling out the Moldflow Scorecard
  • How to make it work!
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ATME - Take Away

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Call Us Today!

If you are not immune to molding problems,
call or contact us today!

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Benefits of Standards


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Predict - Identify - Solve (Conformal Cooling)



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Conformal cooling led to warpage reduction.
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Consequences of Ignoring Standards



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Incomplete Material Testing


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Preliminary Reports - Example


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GMW 16365 - The T1 Tryout


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Correlation process at T1 tryout
  • Goal – produce an acceptable part for GM10067 submission

    • GM buys good parts, not processes

  • Phase 4 – optimum Moldflow process

    • If parts not acceptable, part supplier optimizes process at T1 and forwards process to Moldflow source

  • Phase 4a - updates analysis with T1 process and part mold design changes

  • Phase 5 process is run

    • Correlation of final tryout process with Moldflow

Correlation Scorecard
  • Documents the T1 tryout

  • Dimensional & appearances responses

  • 3 sets of measurements – forward and backward correlation

  • To be filled out during/after the T1 tryout


Some Advice


  • Rely on Experts

    • CAE Services has attended dozens of T1 tryouts
    • Become Expert-certified, or use our services

  • Be prepared

    • Have a pre-T1 meeting

  • Work collaboratively

    • Lean on GM
    • Working independently can sink a program
    • Particularly important at the T1 tryout

  • Be honest when things aren’t working

    • Sir Walter Scott – “Oh, what a tangled web we weave…”
    • Bad news is way better early than late
    • Have opportunity/time to fix problems
    • Feedback to Autodesk makes things better for everyone

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