rolling thread
rolling thread
(OP)
Hi,
I read that rolling thread increase ultimate strength by 30% but I don't find more documentation on the subject. Can someone help me on this subject ?
THX
Simon P.
I read that rolling thread increase ultimate strength by 30% but I don't find more documentation on the subject. Can someone help me on this subject ?
THX
Simon P.





RE: rolling thread
RE: rolling thread
http:/
Ted
RE: rolling thread
RE: rolling thread
http://www.threading101.com/resources.html
scroll through the various articles, especially those by Professor Wilhelm Friedrich Bethlehem
Fatigue acceptance test limit criterion for larger diameter rolled thread fasteners
http://
Factors Which Affect Fatigue Strength of Fasteners
http://ww
Fatigue Crack Growth Analyses and Experimental Verification of Aerospace Threaded Fasteners
http://ww
The effect of manufacturing processes on the fatigue lifetime of aeronautical bolts
htt
Possibilities of increasing the fatigue strength of threaded components
htt
Influence of Cold Rolling Threads Before or After Heat Treatment on the Fatigue Resistance of High Strength
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RE: rolling thread
As per the articles TVP has linked to, thread rolling increases FATIGUE strength in fasteners. That is the main engineering benefit.
RE: rolling thread
RE: rolling thread
RE: rolling thread
Ted
RE: rolling thread
RE: rolling thread
RE: rolling thread
I forgot to say in my question that I was also talking about formed thread.
Swall you said : "However, one needs to keep in mind that with fastener specs, you are always working with specified min tensile strength values--how you get there is immaterial."
With that, want you to say that the increase of tensile/yield strength is not enough significaly to importing these values in our resistance calcul ?
Sorry for my english...I'm a French-Canadian
THX
RE: rolling thread
RE: rolling thread
With alloys that only work harden (austenitic stainless) then you need to be more careful since you have to rely on the cold work. The selection of the starting strength is a real art. Often you can't use annealed material since it is too soft, but if you use bar that is too hard you risk cracking or destruction of tooling.
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