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Problem description - Process is unstable:
- Influence of time or unknown variable
- Process moves slowly towards out of spec
- An incident shift the process
Overview SPC:
- SPC is like telling a dog to “stay”. Wherever the process is, it should remain in that place.
- A stable phase should be defined and notify the operator when the process is out of control limits before it’s out of spec.
Problems with SPC:
- Process screening platform gives a lot of false positives and is therefore not always useable for prioritizing improvements
- Default SPC control limits on our data are often too strict:
- When new data are analyzed, the control limits shifts automatically.
- A change in the process can be overlooked.
The solution should:
- Generate, store and update individual control limits.
- Help in setting limits for multiple variables.
SPC scripts
- The Script generates a table with each variable that contains spec limits.
- It tries to load existing control limits into the table from the DB
- It adds scripts to store and set the limits.
Slides and Demo are available on the attachment.
