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TOPIC: New dies "seating"

New dies "seating" 2 years 6 months ago #1192

Dear All,
after changing the whole die set, our drawing mill operators reduce the speed since, according to them, the dies need "to be seat". Probably that´s true, or maybe it´s just a myth.
I´ll very much appreciate your comments on this subject.
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Re: New dies "seating" 2 years 6 months ago #1193

Rudolf,
I have heard the same thing a few times at my factory as well from the " wire drawing expert operators ". My opinion, BS. If you are using correct dies,the dies have the right geometry,the right lubricant,the right line speed, ect a new die set in you're draw machine is optimal. If you have to wait for "operator induced die seating BS" you have a problem.
That's just my opinion though.Can you prove it ? Of course you can. Try different things out like highly polished dies or a different draft or maybe even a slightly different die geometry and run that baby at full speed.
I've been wrong before but I call BS.
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Re: New dies "seating" 2 years 6 months ago #1194

Hi tech1,
I thank you very much for your suggestions.
I´ll try to come back with my results.
Regards.
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Re: New dies "seating" 2 years 6 months ago #1195

I don't know if it is the same thing but I remember hearing our metalurgist (previous employer long time ago) say that the wire would be better lubricated once the "die ring " began to form. Something about the lubricant rolling back better and forming a lubricant ring in the die. We did not run the machine at reduced speed. probably not valid but how do you know?
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Re: New dies "seating" 2 years 6 months ago #1196

Spectre,
There is way you can prove this theory. I have read of this and have never tried it but, the test seems to be pretty much common sense.
From what I have read,
A bench test "single die" wire drawing machine was set up with a tension guage after the die and before the capstan along with an amp meter connected to the drive capstan to show how much force is needed to (1) power the drive motor (2) tension created to pull the wire through the die. This in turn measured the force it took to pull the wire through the die.
Now, generally speaking if you wanted to see which types of lubricant, draft, speed , and die geometry would be the ideal combination, this bench test would serve you well but, if you wanted to prove out the "die seating or wear ring makes better lubrication in the die" this test would definitly do it for you.

Anyway,
it would be nice to hear if Rudolf has any feedback to this story.
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