DFMEA countermeasures in PFMEA

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qusys

Trusted Information Resource
#2
I was once told that a PFMEA should not be used to counter DFMEA items. Could I please receive your opinion on this?
Not always, in my opinion.
In fact, if you are only responsible of mfg process design and development and not of product design and development, your customer does the D-FMEA where some effects of potential failures could be mirrored in P-FMEA , causing, for example , potential issues of reliability of the product, ins pecific loops of the mfg process (from incoming to shipping through production , as per defined process flow). So, the link should exist.:bigwave:
 
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S

Steve Moat

#3
Thanks for your response.

If a suitable countermeasure cannot be determined for a DFMEA item, do you think it is correct to rely on a PFMEA detection method?

I've seen it a number of times, I'm just not sure how much reliance can be put on the PFMEA for something which should have been designed out:confused:
 

qusys

Trusted Information Resource
#4
Thanks for your response.

If a suitable countermeasure cannot be determined for a DFMEA item, do you think it is correct to rely on a PFMEA detection method?

I've seen it a number of times, I'm just not sure how much reliance can be put on the PFMEA for something which should have been designed out:confused:
I see your point and agree. From the working experience many potential issue may derive from potential issue in design, but I think that p-FMEA can help in mitiganting risks. This is the power of FMEAs, both D and P.
However, another opportunity is to rely on controls inserted in the control plans, derived from special characteristics ( both customer's ones and organization's ones). Again , if reliabiity of the product can be an effect in D-FMEA, you could also insert controls in control plan such as testing of specific structures , linking them with special characteristics.:bigwave:
 

Miner

Forum Moderator
Staff member
Admin
#5
I was once told that a PFMEA should not be used to counter DFMEA items. Could I please receive your opinion on this?
That is correct. DFMEA Severity and Occurrence can only be reduced through a design change. DFMEA Detection only refers to design verification or validation testing that occurs prior to engineering release. Process detection is too late. Process detection controls are rated at a 10 on the DFMEA Detection rating.

Remember that a DFMEA is intended to identify and mitigate design risks. Process controls do not mitigate design risk.
 

Jim Wynne

Staff member
Admin
#6
That is correct. DFMEA Severity and Occurrence can only be reduced through a design change. DFMEA Detection only refers to design verification or validation testing that occurs prior to engineering release. Process detection is too late. Process detection controls are rated at a 10 on the DFMEA Detection rating.

Remember that a DFMEA is intended to identify and mitigate design risks. Process controls do not mitigate design risk.
If this is true, and I believe it is, then the identification of special characteristics as DFMEA output is unnecessary.
 

Chennaiite

Never-say-die
Trusted Information Resource
#8
If this is true, and I believe it is, then the identification of special characteristics as DFMEA output is unnecessary.
What is the relevance between Special Characteristics identification as DFMEA output and the point of detection control in the product lifecycle. I am unable to understand.
 
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