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DOE for straightner

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Viewing 9 posts - 1 through 9 (of 9 total)
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  • #35710

    Wilson
    Member

    hi,  has any one performed experiments on straightner to flaten the sheet before it enters the die in a punch press? I need some help.thanks

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    #101025

    Bob J
    Participant

    Hi Wilson!
    I’ve never done a DOE on a straightner but maybe I can help…
    A couple of quick questions so I can understand your process:
    What is your output variable (flatness?) and have you done a MSA?
    What are the primary factors you want to study (material type, material thickness, roller pressure, speed etc)?
    Best Regards,
    Bob J

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    #101077

    Wilson
    Member

    Hi Bob,
    thanks for the rply.
    output variable is flatness. MSA is done.
    Factors are material ( hardness, elongation), strightnening roller position ( it is in inches i.e .001,.002 from its zero position up i.e thickness of sheet + .001 or .002 etc., there are 2 set of rollers), speed, coil position( start of the coil, middle and end of coil).
    best regards
    wilson

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    #101107

    Bob J
    Participant

    Hi Wilson,
    Thanks for the detail….  It helps…
    The cleanest approach would be to use a DOE.. 
    Given the number of factors I would start with a screening design which will enable you to rank and prioritize main effects.  The only risk here is that you might have second (or higher) order interactions but usually that is a relatively safe assumption.  Remember that you want to maximize the factor influence on your output so select your levels at whatever reasonable extremes are available…
    Once you id your most significant factors you can follow up with an optimization strategy build around RSM….
    Hopefully this is clear and makes sense to you…  If not, please reply and I’ll see what I can follow up with that will help clarify…
    Best Regards,
    Bob J

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    #101237

    Wilson
    Member

    Thanks Bob. I will contact you once I get some results.
    Wilson

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    #101238

    Bob J
    Participant

    Wilson,
    No problem…  my email is [email protected]
    Best Regards,
    Bob J

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    #142893

    Andrew Daley
    Participant

    How did the trial go?  I am also doing a DOE based on part twist with very similar variables.  Anything you would do differently?

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    #142897

    Bob J
    Participant

    Hi Andrew!
    Never heard back from Wilson so I assume all went well…  You might want to ask him directly to see if he has any details for you…;- )
    Best regards,
    Bob J

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    #142898

    Alvarez
    Participant

    How did you make out with your DOE?  I am also starting a DOE based on eliminating or controlling twist of a part after it has gone through the straightner.  Let me know as I would be very interested in your findings and what you would do differently next time.

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