Thread Rolling in Titanium
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From: guynoir on 12 Jan 2007 16:39 I need to roll some threads in a blind hole in 6AL-4V titanium. They are about 5/8" holes, about 5/8 deep. Anyone have some guidance on how to do this? Thanks, -- J Kimmel myname(a)whereIwork.com www.metalinnovations.com
From: G. De Angelis on 12 Jan 2007 17:29 Thread rolling is normally used in the making of external threads, as on a shaft, for example. It is a lower quality thread than a cut thread. Inexpensive threaded rod that can be purchased in a hardware store is the best example I can think of to demonstrate rolled thread quality. It is generally used when the cost of the item needs to be as competitive as possible. You can cut the threads that you need very easily, by drilling a 17/32" hole, 5/8" deep for a 5/8-11 thread, which is standard, or by drilling a 9/16" hole for a 5/8-18 thread which is a fine thread, then using a starting tap, followed by a plug tap, for the last few threads at the bottom of the blind hole. If you require a lot of holes to tap, you will need "coated taps", and a good quality lubricant, as Titanium, is about as tough a metal to machine as you will find. I hope this helps you. G. De Angelis Valhalla Grafix www.deangelistool.com guynoir wrote: > I need to roll some threads in a blind hole in 6AL-4V titanium. They > are about 5/8" holes, about 5/8 deep. Anyone have some guidance on how > to do this? > > Thanks, > -- > J Kimmel > myname(a)whereIwork.com > www.metalinnovations.com
From: F. George McDuffee on 12 Jan 2007 18:37 On 12 Jan 2007 13:39:28 -0800, "guynoir" <blpzx(a)hotmail.com> wrote: >I need to roll some threads in a blind hole in 6AL-4V titanium. They >are about 5/8" holes, about 5/8 deep. Anyone have some guidance on how >to do this? > >Thanks, ================== see http://news.thomasnet.com/fullstory/476363/1292 http://findarticles.com/p/articles/mi_m0KJI/is_8_113/ai_81138590 http://www.emuge.com/taps/gfu_druck.html http://www.emuge.com/technical/tapfinder/drucksticn.html http://www.emuge.com/technical/tapfinder/druckpmticn.html and many more. Because of the high force/friction involved in internal thread forming in titanium, your choice of tap lubricant may be critical. Some of the best friction reducers such as MolyDisulfide may also contaminate the metal. Has anyone tried a lube containing teflon? Good luck and let the group know how you make out. Unka' George [George McDuffee] ................................ On Theory: Delight at having understood a very abstract and obscure system leads most people to believe in the truth of what it demonstrates. G. C. Lichtenberg (1742-99), German physicist, philosopher. Aphorisms "Notebook J," aph. 77 (written 1765-99; tr. by R. J. Hollingdale, 1990).
From: Matt Stawicki on 12 Jan 2007 18:59 On 12 Jan 2007 13:39:28 -0800, "guynoir" <blpzx(a)hotmail.com> wrote: >I need to roll some threads in a blind hole in 6AL-4V titanium. They >are about 5/8" holes, about 5/8 deep. Anyone have some guidance on how >to do this? > >Thanks, Rolling ID threads is not a problem. Do it all the time. You simply need a roll tap, or also referred to as a Thread Forming, Cold Forming, or Roll Forming Tap. You can start by using it just like you would a cut tap, although you will most likely find that you can run it at a faster rpm. You're going to need some HP behind that tap. Don't know what kind of machine you're using, but I run 1/2-13 roll threads on my 5C Gang Lathe rather often, and it works quite well. It groaned a bit the last time I used a 5/8" CUT tap, and, although I've never tried it, I'm quite certain that it wouldn't pull the 5/8" roll tap. But then, it's pretty wimpy. Hopefully you have a machine with plenty of power. Find some taps with oil grooves. You're going to have enough fun without having to deal with the hydraulic resistance of the oil compressing in the bottom of the hole. The Greenfield taps have 4 oil grooves, and really do work well. Some of the local (Escondido/San Diego) tooling suppliers stock them, but you can also get them from McMaster Carr or MSC. OSG taps are another good choice, but I don't know if their larger diameters have oil grooves or not. The 1/4-20's I have here do not. Matt
From: Phil on 12 Jan 2007 19:05
I would take slight issue with you on being an inferior quality. Rolled threads are used on high tensile bolts due to the grain flow it produces, therefore yielding far greater strength. Aero engine bolts are rolled and ground. The inferior quality may certainly be attributed to the final form, therefore the follow on grind operation. ---------------------------------------------- Posted with NewsLeecher v1.0 Final * Binary Usenet Leeching Made Easy * http://www.newsleecher.com/?usenet ---------------------------------------------- |