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DFMEA (Design FMEA) on Printed Circuit Boards (PCB's)

R

Riskophil

#1
Hey guys,

i got a question regarding creating DFMEAs for PCBs.
We are producing medical devices that look like mobile phones. Now we are curious if we could improve our design quality using a DFMEA.
Is there anyone that has done some DFMEAs on electronics?

Our first idea was to divide our pcb into functional groups and then do the rating. Is this a good way to do some analysis? What are typical, appropirate mitigation measures???

thanks in advance guys.
:cool:
 
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M

mayank_thkkr

#3
Welcome to the Cove..!

The ideal approach should be to do Functional Analysis before DFMEA.

In my current organization we did DFMEA on Control System (SCADA).

We started with

Functional Analysis :

1. Product Structure Tree: System, Sub-system, Component level identification.

2. Item Function Worksheet : List down all the function in Verb-Noun and When form. Further categorize them in Basic Function, Secondary Function, Same time Function, All the Time Function, Design Function.

3. Boundary Diagram : Interaction of components within the systems and with surrounding systems as well as Environment. (Physical, Energy, Mass and Information related interactions)

4. Interface Matrix : It Illustrates relationships between the subsystems, assemblies, subassemblies, and components within the object as well as the
interfaces with the neighboring systems and environments. (Interface Regarding PEMI - Physical, Energy, Mass and Information) Further it identifies the type of Interface required:

+2 if Interaction is necessary for the function
+1 if Interaction is essential but, not absolutely necessary for the function
0 If Interaction does not effect functionality
-1 If Interaction causes negative effect but does not effect functionality
-2 If Interaction must be prevented to achieve functionality.

5. Parameter Diagram : Identify Noise factors Occurring due to (Mfg variation, Environment interaction, Component to Component Interaction Customer Abuse, Wear over time etc)

Refer to the attached figure to see the linkages of this Functional Analysis stage with DFMEA.

Apart from DFMEA you will have action points coming out from Interface Matrix and Parameter Diagram.

:)
 

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