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The New Elsmar Cove Forums
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 The New Elsmar Cove Forums
 QS-9000
 Process changes
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| Author | Topic: Process changes |
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Martin Forum Contributor Posts: 18 |
posted 23 May 2000 06:00 AM
   
I had a question: I have difficulty with the fact what exactly a process change (4.9.5.) is. I will give an example. If our operators change the setting of the machinery I think it's a process change, but if we have to register every time that happens the paperwork isn't "funny" anymore. Can somebody give me a good explanation of process change? Thanks in advance, IP: Logged |
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Marc Smith Cheech Wizard Posts: 4119 |
posted 23 May 2000 08:07 AM
Is this in regard to resubmission of PPAP to address an 'official' process change? IP: Logged |
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Martin Forum Contributor Posts: 18 |
posted 23 May 2000 08:17 AM
It isn«t regard to resubmission, because I get that, but it«s regard to point 4.9.5. Which states the following: The supplier shall maintain records of process change effective dates. (see 4.5.3.) Note: Changes to promote continuous improvement are encouraged. Consult the customer for guidance on approval requirements for such changes. And I don«t know how I must see the process changes in this case. The same as with the PPAP submission. Maybe you could tell me... Thanx anyway, IP: Logged |
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Marc Smith Cheech Wizard Posts: 4119 |
posted 23 May 2000 08:31 AM
If you change a stated process parameter it is a process change. If you change a set-up procedure, a control plan (one or more items) or other process particular, you are changing the process. Typically this is a non-issue as the documents are controlled and as such a history of changes is found in the documents themselves. Most companies look to their Engineering Change System as the repository of a history of process changes and their implementation dates/times. An important factor is looking at this with regard to traceability as well. What requires resubmission of PPAP is variable and has been discussed in a number of threads here. Do a Search here (maybe for 'resubmit' or PPAP). If you don't find anything, come back to this thread and let me know. I'll help out from there. OK? IP: Logged |
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Martin Forum Contributor Posts: 18 |
posted 23 May 2000 08:43 AM
OK.. I get it, so I don«t have to document every change that my operators make when the change the parameters am I right? Because the way I see it now is that you have a total process change (changing set up instructions, process flow, etc.) or part process change (changing parameters).... Thanx, Martin IP: Logged |
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Marc Smith Cheech Wizard Posts: 4119 |
posted 23 May 2000 09:02 AM
You have a lathe operation. You notice that you are getting a 'trail' on your piece. Your inspection shows that although this 'trail' is visible, the part passes your surface roughness requirement. You slow down feed rate 10% from set-up and the problem worsens. The operator increases the feed rate 20% from set-up and the problem goes away. The responsible engineer changes the CNC set-up program to reflect this 20% increase. Is this a process change? I wouldn't classify it as such but you can get an arguement that it is. It really has no effect on the product - it was passing (technically) prior to the change and the change of a feed rate is not (opinion on word choice) significant. You have to make some decisions on a case by case basis what is 'significant' to your process. Where operators can make adjustments they are typically 'minor' - you want an engineer involved if a 'major' problem arises. Where the operators are 'tuning', they are not really changing the process. In the lathe example operators are allowed to adjust feed rate +/- 30% from set-up. They do not have to get authorization to do this. However - it is expected that the responsible engineer (or other 'authority') be (in general) monitoring what is going on so that s/he knows if every operator on every shift is always setting the feed rate up 20%. The operators are not, however, required to record the change unless it is in response to an out-of-control condition where it is recorded on the control chart. However, if you change the set-up instruction it technically becomes a process change, but is it significant? Not in my opinion. I don't believe 4.9.5 is meant to control this type of minor process change. I see 4.9.5 as important in more 'significant' process changes such as a change from a grind to a hone, a large process parameter change (such as mold temperature or hold time in injection molding) or a sequence change. [This message has been edited by Marc Smith (edited 23 May 2000).] IP: Logged |
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