Stress Coining
Stress Coining
(OP)
Does anyone know the difference between stress coining a hole and cold working a hole? I am machining a fitting from aluminum plate have a requirement that states that no stress coining is allowed in any holes located with the axis normal to the ST direction. I'm not familiar with the term stress coining. Did some basic research and it sounds like it is similar to cold working.





RE: Stress Coining
cold working a hole is expanding the hole bore.
RE: Stress Coining
RE: Stress Coining
Perhaps the end user has had problems with hole size and/or trueness being affected by this on previous parts and has included this note so the fabricator is aware that they are not to compress the faces of the plate around the hole for any reason. Or, maybe a previous vendor used this technique to bring out of tolerance holes into tolerance which created unintended problems. Regardless, you seem to have done your due dilligence in finding out what is prohibited and should be able to comply.
rp
RE: Stress Coining
RE: Stress Coining
RE: Stress Coining
Mfgenggear
RE: Stress Coining
sorry I should have read your post better, yes I agree with your statement, sorry for repeating the post.
Take Care
Mfgenggear