Question on PFMEA Failure Effects
- Thread starter Mandi
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I'm bringing this up again because reading all your point of views and reviewing AIAG & VDA, it looks I'm having big troubles understanding the Next Higher Level when it comes to PFMEA, identifying what it is and assigning functions/failures to it. So here I am, in need of your multi-year experience.
The book calls it the Process Item and explains that it is the result of a completed series of process steps. From this, I understand that in a typical production process, different Process Items are created which then come together to form the final product.
So what functions should be identified at each Process Item level (where the effects lie according to AIAGVDA)? Are the functions a result of what was achieved through the series of operations at the focus element level? Or do they have to introduce a link to other Process Items obtained through a different series of operation?
I will gladly hear anything you can share, whether it is an example, explanation, idea, suggestion... Thank you very much
The book calls it the Process Item and explains that it is the result of a completed series of process steps. From this, I understand that in a typical production process, different Process Items are created which then come together to form the final product.
So what functions should be identified at each Process Item level (where the effects lie according to AIAGVDA)? Are the functions a result of what was achieved through the series of operations at the focus element level? Or do they have to introduce a link to other Process Items obtained through a different series of operation?
I will gladly hear anything you can share, whether it is an example, explanation, idea, suggestion... Thank you very much
Not directly related to your question but Ive worked with adhesion promoters that has either has an additive or is naturally detectible under a black light. We used black lights at workstations to aid the operator and at quality gates to inspect for proper promoter application.
A function is an action that transforms something into something else. It can be as simple as an acid treatment to remove debris from a surface. it might help you to think of the purpose of the process; what it supposed to do?
You can take a look at my presentation on risk assessment in the resources section - although its focused on products it will give some examples that might help…
You can take a look at my presentation on risk assessment in the resources section - although its focused on products it will give some examples that might help…
Johnnymo62
USA Semiquincentennial
Thank you for the answers.
Yes we are using the Process Flow Diagram as the starting point and, to my understanding, each operation of the flow is the focus element according to AIAGVDA. But my question was, and still is, what about the next higher level to the focus (i.e. Process Item)? How do you identify it and what functions are associated to it?
Yes we are using the Process Flow Diagram as the starting point and, to my understanding, each operation of the flow is the focus element according to AIAGVDA. But my question was, and still is, what about the next higher level to the focus (i.e. Process Item)? How do you identify it and what functions are associated to it?
So here is one reason that I dislike these industry standards on things like FMEA: teh text is written so obtusely that it is difficult to understand and only supports my suspicion that these things are written by people who have no clue about actual design processes, manufacturing processes, or product function.
What the heck is a “Process item”????? Is it the ‘thing’ that is being processed / transformed by the function of a process step? That is what I would infer…for example the process item (by natural laws of linguistics) for a welding process might be the door hinges on a car door. The process is welding and the function is to attach the the hinge to the door (in admittedly general terms)
Is it the larger process step as in welding the hinge that includes the specific steps of applying energy and creating an adhesion as in a weld (noun) on a door that is positioned and held by a robot?
However I could also interpret it as being a very small component or the welding process such as the energy type being applied during the ‘welding’ process, or the angle of the hinge to the door as presented by the robot….
Maybe someone more knowledgable in this standard can answer it.
What the heck is a “Process item”????? Is it the ‘thing’ that is being processed / transformed by the function of a process step? That is what I would infer…for example the process item (by natural laws of linguistics) for a welding process might be the door hinges on a car door. The process is welding and the function is to attach the the hinge to the door (in admittedly general terms)
Is it the larger process step as in welding the hinge that includes the specific steps of applying energy and creating an adhesion as in a weld (noun) on a door that is positioned and held by a robot?
However I could also interpret it as being a very small component or the welding process such as the energy type being applied during the ‘welding’ process, or the angle of the hinge to the door as presented by the robot….
Maybe someone more knowledgable in this standard can answer it.
I found a fairly good explanation here. The definition is in the graphic below, but the linked article explains the OP's original question in detail.
