How to Identify a Part After Being Modified?

Six Sigma – iSixSigma Forums Operations Manufacturing How to Identify a Part After Being Modified?

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    Javier Mora

    Hello everybody, our purchasing, production departmaent have a problem with some of our iron cast parts. Basically, the problem is that after the part passes through the entire manufacturing processes (milling, turning, pulishing, etc) we can not see the material number or any other information regarding the supplier, which makes us almost impossible to know where to make a complain (if needed) when such a part comes with defects. Does anyone have any suggestion to solve this problem? thanks in advance



    @javiermora85 – is the inability to see material number due to being machined off, or just located in a place no longer visible? In either case, moving the location would seem to be in order. If it’s a matter of coarseness of the casting material requiring a large imprint which cannot be moved, then perhaps an RFID attached post casting would be in order.


    Michael Clayton

    @javiermora85 MBBinWI has good idea as does prior comment.

    So please think about, what is cost of product roughly, volume, and cost of field problems historically that might have suggested tracking. That would tell you if you can afford laser marking after polishing IF each casting is TRACKED in a DB to that point so you really know the input serial number or vendor batch date.

    Risk management is based on history of failure modes, and customer experience, as well as internal scrap issues with each vendor, or same vendor over long time. And lately, with litigation being used simply to harass and get lower price next round, you have to discuss these costs with finance, marketing, sales and management team, as remedies are not free. So first question, do you have wip tracking system in place? Eyelit, for example. Or Camstar. Or any home brew database and tool data entry terminals.


    Mike Carnell

    @javiermora85 This probably won’t be of much asistance but if the diamond industry can laser inscribe a serial number on a diamond a casting should be relatively simple and not a new application. You can even Google it.

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