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Strip thickness tolerance 1
- Thread starter MagBen
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1
- #4
pmarc
Mechanical
- Sep 2, 2008
- 3,248
I am looking at this link... :
... and it seems that this is not a science-fiction (at least for this supplier). Of course I assumed we are talking about steel.
How do they accomplish this? I do not know - I know almost nothing about metal strip manufacturing. But I know how to use google![[wink]](/data/assets/smilies/wink.gif "[wink] [wink]")
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... and it seems that this is not a science-fiction (at least for this supplier). Of course I assumed we are talking about steel.
How do they accomplish this? I do not know - I know almost nothing about metal strip manufacturing. But I know how to use google
.If were talking metals (stainless) there is an astm spec that governs strip and sheet thickness tolerance (ASTM A480 I think…). You don’t control the thickness the mill source does (see sandvik… ) and you supply your customer with a copy of the material certs the source will supply.
lightweight, cheap, strong... pick 2
lightweight, cheap, strong... pick 2
We get foil rolled to a 5 micron total tolerance, what your customer is asking for is not much different. Material choice will make a big difference.
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
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The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
- Thread starter
- #8
It is metal material. I donot know if other materials, e.g. rubber, plastic, can be called strip product, but I can be wrong.
ASTM (there are a huge number of tolerance specs based on materials), and ISO 9447 standard tolerances are much looser than what the custoemr is asking for. Our internal limits are much tighter than ISO tolerance, but still looser than the req's.
The only solution I could find was to cold roll wider than needed and to discard the out of tolerance material. but obviously, this means a substantial decrease in yield and a substantial increase in cost.
By the way, Google is a good tool for a general question, but hardly useful for an expert in the field.
P.S. Even the best tolerances listed by Sandvik can not meet my customer's req's.
At .0006'', a tolerance of +/- .00004'' sounds not that impressive, it is +/- 6.7%. My company can do .0006'' +/-.00003''.
ASTM (there are a huge number of tolerance specs based on materials), and ISO 9447 standard tolerances are much looser than what the custoemr is asking for. Our internal limits are much tighter than ISO tolerance, but still looser than the req's.
The only solution I could find was to cold roll wider than needed and to discard the out of tolerance material. but obviously, this means a substantial decrease in yield and a substantial increase in cost.
By the way, Google is a good tool for a general question, but hardly useful for an expert in the field.
P.S. Even the best tolerances listed by Sandvik can not meet my customer's req's.
At .0006'', a tolerance of +/- .00004'' sounds not that impressive, it is +/- 6.7%. My company can do .0006'' +/-.00003''.
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