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TYPES
What can Failure Mode and Effects Analysis do for you?
Design FMEAs
The Design FMEA (DFMEA) is a disciplined analysis of the part design with the intent to
prevent the design-based failure modes prior to the first production run. It needs to be
done early in the product design cycle -- as soon as the design concept has been selected.
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Here to see a blank DFMEA, with numbers corresponding to the numbered steps
referred to below.
The DFMEA involves:
Identifying the potential or known failure modes (step 4) for the part functions
(described in steps 2 and 3),
Identifying the effects (step 5) and the causes (step 6) of each failure mode,
Prioritizing the identified failure modes based on the frequency of occurrence (step 7),
the severity of the failure mode (step 8), and the likelihood of detection (step9), and
Providing for follow-up corrective and preventive actions (step 11) on the prioritized
(via the Risk Priority Number in step 10) causes.
Process FMEAs
The Process FMEA (PFMEA) is a disciplined analysis of the part's processes with the intent
to prevent the process-based failure modes prior to the first production run, before money
is spent on machines, tooling, etc.. The focus is to prevent, or at least detect, changes
in the process variables which could lead to a deviation from the design requirements. For
the PFMEA, step 2 on the DFMEA form lists the process involved in making the part being
studied, and in step 3 there is a short description of the purpose of the process. |
