Stress Relieving before/after Thread Rolling.

[Abstech]

I have a 15-5 shaft, heat treated to H-1025 condition that requires thread rolling.
Prior to thread rolling operation, this shaft will be rough machined by leaving .010 stock per side on all surfaces.

OD = 2.250
ID = 1.375
OAL = 15 inch

Thread area is approximately 1.3 inch long (1 end only).

Do I need to perform stress relieve operation before and after thread rolling?
If Yes, at what temperature? (375 'F' or 800 'F')

Thank you in advance.

 

[TVP]

In what condition do you intend to perform the rough machining, H1025? If so, then you can stress relieve after rough machine at 100 F below the aging temperature for 1 hour. Do not stress relieve after thread rolling. Does the engineering drawing specifically reference SAE AMS 2759/3D? If it does, then stress relieving is prohibited on parts that have been thread rolled after aging. You may want to consider warm rolling, which is when heat treated parts such as this are heated to a temperature below their aging/tempering temperature and then rolled. 900 F is frequently used to warm roll high strength threaded aerospace components.

 

[Facewithasmile]

Stress Relief seems to bring with it the problem of warpage and bending of shafts. You may have to hand run a Die over the threads to straighten and clear oxides from the thread root diameter.

 

[rosebudd29]

Don't stress relieve after thread rolling. I don't know the temp, sorry.

 

[silveringchap]

The idea of thread rolling is to work harden the material.Stress relieving after may undo the reasons for doing it in the first place.However, thread rolling is about cold forming a thread and since you have a semi hardened shaft you may consider locally heating the threaded area to soften the material a bit.Any distortion would depend on where the thread is going to go.If on the end, you will probably get away with it but you may have to re-centre it.