From DDL Wiki
| Part Name
| QTY
| Mass (g)
| Function
| Manufacturing Process
| Material
| Image
|
| Door Holder Front
| 1
| 13
| Secures Door-Latch to Door
| Stamping
| Steel (Coated)
|
|
| Door Holder Front
| 1
| 13
| Secures Door-Latch to Door
| Stamping
| Steel (Coated)
|
|
Design for Manufacturing and Assembly (DFMA)
Failure Mode and Effects Analysis (FMEA)
Performing a failure mode and effects analysis (FMEA) allows us to determine potential areas of concern, particularly ways in which our product can fail. The FMEA also allows us to prioritize each failure mode. After determining the severity (S), the probability of occurrence (O), and detectiblity of failure (D), on a scale of 1-10, the three values are multiplied, which yields a risk priority number (RPN). This number is then used to order the failure modes in terms of importance. The table below shows the results of our FMEA analysis on our doorknob.
Design for Environment (DFE)
| Item and Function
| Failure Mode
| Effects of Failure
| S
| Causes of Failure
| O
| Design Controls
| D
| RPN
| Recommended Actions
|
| Locking mechanism
| Shaft fails
| User cannot lock or unlock
| 7
| User turns locking lever too hard
| 3
| None
| 5
| 105
|
|
| Doorknob
| Doorknob fails
| Door cannot be opened
| 8
| User turns doorknob to hard
| 1
| None
| 5
| 40
|
|
| Door latch
| Latch spring fails
| Door inoperable - fails to stay closed
| 7
| Age/wear
| 1
| None
| 5
| 35
|
