Elsmar Forum Sponsor
If you mean failure of the completed assembly (a failure of the design function), no.
A PFMEA is a Process failure mode identifier. It is, simply put, the difference between a process failing vs. the design failing.
However, a DFMEA (Design FMEA) may have an aspect passed down to a process FMEA where is can be shown that a process failure which goes undetected has a high risk of death {or such} if the final assembly fails.
A PFMEA is a Process failure mode identifier. It is, simply put, the difference between a process failing vs. the design failing.
However, a DFMEA (Design FMEA) may have an aspect passed down to a process FMEA where is can be shown that a process failure which goes undetected has a high risk of death {or such} if the final assembly fails.
G
GoKats78
No, the mechaincal failure is the equipment used in the process - there are several pieces of equipment used to make our product and if one breaks down the process stops! Hence, failure mode! or not!
D
D.Scott
The process is a series of planned events. If the unexpected stoppage isn't planned, I would call it a failure mode and address it.
Dave
Dave
G
GoKats78
An accumulator on a tube mill - the failure mode identified is "mechanical failure" - the prevention control listed is "Preventive Maintenance Program".
Do we really want to go down that path?
Do we really want to go down that path?
B
Bill Ryan - 2007
Before I jump in with both feet I'd like to ask what your definitions of "Failure Mode" and "Failure Cause" are and how the two columns are addressed in your Control Plans.
In my methodology, a "mechanical failure" is normally treated as a "Cause" of an expected output of that process step (excessive downtime, scrap, etc.).
In my methodology, a "mechanical failure" is normally treated as a "Cause" of an expected output of that process step (excessive downtime, scrap, etc.).
I have seen a lot of PFMEAs with failure modes cited with Preventive Maintenance as the 'control'. I do agree with Bill, what's on the control plan?
Also - If the accumulator fails (I assume it's catching product), what happens? Most of what I see where you have something like that there's a sensor that stops everything.
Part of the question here is would it be more applicable to a machine FMEA than a process FMEA.
A couple of other things to consider is the history of the equipment. Does it break down a lot? Once a year? Once a month?
Also - If the accumulator fails (I assume it's catching product), what happens? Most of what I see where you have something like that there's a sensor that stops everything.
Part of the question here is would it be more applicable to a machine FMEA than a process FMEA.
A couple of other things to consider is the history of the equipment. Does it break down a lot? Once a year? Once a month?
R
ralphsulser
How about Preventive and Predictive Maintaince. Historical data of frequency to be determined by analysis of data showing breakdowns, how often and and causes. Is there evidence this been a continuing problem?
