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Potential Failure Mode

Discussion in 'FMEA - Failure Modes and Effects Analysis' started by ar85dan, Jul 12, 2019 at 2:29 PM.

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  1. ar85dan

    ar85dan New Member

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    Hello all,

    I have a question, something i am not sure i understood correctly about the PFMEA.
    I am talking about a sunshade, which afterwards the customer places it in the back door of a car.
    I have process step 1 (final station assembly) and process step 2 (checking station). In process step 1 I assemble the product and check some characteristics (Eg. Force in the fabric) and in process step 2 i only check the characteristics that i cannot check in process step 1, no other assembly.
    For example, only in process step 2 I can check if the fabric from the product is not wavy on the sides, because i have a jig that simulates the door and can see how the product looks. But this waviness appears because of nok process in process step 1.
    My question is, what do I write for process step 2 as potential failure mode?
    For example do I write this "waviness" at process step 2, because i detect it here, or at process step 1, because i create it here?
    Or do I write only failures that i can make at process step 2? (in my case, as there is no assembly, i would write none!??)
    Hope i was clear enough.

    Thanks for your help
     
  2. Miner

    Miner Moderator Staff Member

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    I would list waviness as a failure mode in the process step that created it. Your detection would be the next process step where you inspect for it. At process step 2 your failure modes would be accepting a wavy part, rejecting a good part or bypassing the inspection..
     
  3. Andy Nichols

    Andy Nichols Moderator Staff Member

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    Are you asking about a Design FMEA or a Process FMEA. It seems to me that you are checking the design, not the assembly process. I'd have to see more details of your FMEA
     
  4. tony s

    tony s Well-Known Member

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    I would prefer to enter "waviness" in the Potential Effect/s of Failure of your PFMEA for process 1. As per the AIAG manual "The effects of the failure should be described in terms of what the customer might notice or experience... The customer in this context could be the next operation..."

    You have already given us a hint of the Potential Failure Mode when you mentioned "this waviness appears because of nok process in process step 1". What is that "nok process"? This could be the failure that you need to address (e.g. inadequate force applied in the fabric). Again in the AIAG manual, potential failure mode is defined as "the manner in which the process could potentially fail to meet the process requirement (including the design intent)". No waviness here could be the design intent.

    Process 2, as you mentioned, is the checking station. Failures that can happen here should be associated with the checking process like jig not set properly.
     
    Last edited: Jul 14, 2019 at 11:10 AM

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