Development of Design FMEA - Functional Requirements

Rajendrak

Involved In Discussions
In FMEA manual there are 13 categories specified as functional requirements which may be included during design stage e.g. General, Safety......Design for Manufacturability.

Now if we take the example of Design for Manufacturability we have been told by customer to split potential failure modes in -

1. No function
2. Under function
3. Overfunction
4. Degraded function and
5. Unintended function

Hence for this specific point we will be making it as below -

1. No function- Not able to Manufacture
2. Under function - Able to manufacture with less than production norms
3. Overfunction - No issue
4. Degraded function and - No issue
5. Unintended function - None known

Will it be OK? Please guide
 

QAengineer13

Quite Involved in Discussions
In FMEA manual there are 13 categories specified as functional requirements which may be included during design stage e.g. General, Safety......Design for Manufacturability.

Now if we take the example of Design for Manufacturability we have been told by customer to split potential failure modes in -

1. No function
2. Under function
3. Overfunction
4. Degraded function and
5. Unintended function

Hence for this specific point we will be making it as below -

1. No function- Not able to Manufacture
2. Under function - Able to manufacture with less than production norms
3. Overfunction - No issue
4. Degraded function and - No issue
5. Unintended function - None known

Will it be OK? Please guide
About the FMEA tool:

FMEA is a reliability tool used in a step-by-step approach for identifying all possible failures in a design, a manufacturing or assembly process, or a product or service.

In your case as you are interested in design FMEA, Failures are prioritized according to how serious their consequences are, how frequently they occur and how easily they can be detected. The purpose of the FMEA is to take actions to eliminate or reduce failures, starting with the highest-priority ones.

Please NOTE:

FMEA is used during design to prevent failures

“Failure modes” means the ways, or modes, in which something might fail. Failures are any errors or defects, especially ones that affect the customer, and can be potential or actual.

“Effects analysis” refers to studying the consequences of those failures.

With the above definitions in mind, you need to take a"Function" in the first column and in the next column the "Potential failure" modes and follow the instruction by your customer by splitting each failure mode in to these branches, what if there is 1. No function
2. Under function
3. Overfunction
4. Degraded function and
5. Unintended function


for 1/. No Function , next column what is the Potential Effect, Severity, Potential Cause,Occurrence , Current process control, Detection , RPN....etc

whatever template that you would like to follow, is what you are supposed to do, your example did not make sense to me IMHO. I hope this brings some clarity in your thought process.
 
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