How do KPC/KCC features work into PFMEA?

V

vforge

#1
For example, for CNC milling, is it advisable on the PFMEA to: (A) generalize about 4-5 failure modes for CNC milling (e.g. fixture error, load error, operator error, machine error, program error, tool wear/breakage) as common modes across all print features or (B) list the generic modes in (A) but also discretely list those KPC/KCC features as they map from the flow diagram? Presumably this is a way to exhibit enhanced detection methods (error-proofing, etc) for KPC/KCC features. Our question about this arose because we were trying to assign occurrence/detection scores to the generic failure modes. Like most manufacturers, we only do first article inspection for some print features, some we periodically SPC, some we 100% limit gage and some are error-proofed into subsequent operations; each feature type gets a different detection score, so how do you reflect this on the PFMEA without itemizing every feature? Our thinking is that listing the KPC/KCC features is a good compromise. Thoughts?
 
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Howard Atkins

Forum Administrator
Staff member
Admin
#2
As far as I know all the KPC\KCC must be on the PFMEA.
If you have a generic FMEA then this can be a problem but you will need a part specific for the KPC.

Are these customer or internal KPC?
What is your customer expecting?
Does he not want SPC on these characteristics?
 
V

vforge

#3
Howard Atkins said:
As far as I know all the KPC\KCC must be on the PFMEA.
If you have a generic FMEA then this can be a problem but you will need a part specific for the KPC.

Are these customer or internal KPC?
What is your customer expecting?
Does he not want SPC on these characteristics?
They are customer and internal KPC features. Our customer is expecting an AIAG PPAP. This is more of a general question because I haven't found a good PFMEA example with them listed. In which column on the PFMEA would you list the KPC/KCC's? They do want SPC, and we will do. Thanks.
 

Howard Atkins

Forum Administrator
Staff member
Admin
#4
On the FMEA form after the column for severity is a column market class- this is where you should use the customer or your sign for the KPC
Hope this helps
 
B

Bill Ryan - 2007

#5
Here is an example of how a customer designated "Safety" feature shows up. A "KPC/KCC" would "look the same".

Are you asking whether the KPC/KCC get put in the "Mode" or "Cause" column? If so, our "special characteristics" are found in the Failure Mode column if they can be measured on the product and in the Failure Cause column if they can be measured in the process. Does that help?
 

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