Manufacturing Process for 17-7 PH Stainless Valve Plates
Manufacturing Process for 17-7 PH Stainless Valve Plates
(OP)
We have a need to make some very flat plates from hardened 17-7 PH stainless. The problem we're having is that the plates are ported and ground flat and parallel within 0.001", and we must have a final hardness of around 42Rc. We've already failed on one batch, where we ended up with the plates warped about 0.010". Does anyone have a suggestion for order of processes, figuring they need to be ported out, ground flat, and heat treated?





RE: Manufacturing Process for 17-7 PH Stainless Valve Plates
to squeeze and keep the 17-7 flat during heat treatment.
RE: Manufacturing Process for 17-7 PH Stainless Valve Plates
RE: Manufacturing Process for 17-7 PH Stainless Valve Plates
RE: Manufacturing Process for 17-7 PH Stainless Valve Plates
RE: Manufacturing Process for 17-7 PH Stainless Valve Plates
rough machine, then age, then finish machine. Unless you have to make hundreds of these, and even then you will have better luck. You might want to even machine the ports and before you go to final flatness re-age. As I recall if you stay at a slightly lower temp for a shorter period of time you won't screw up the properties and you may get a bit of stress relief.
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Plymouth Tube
RE: Manufacturing Process for 17-7 PH Stainless Valve Plates
RE: Manufacturing Process for 17-7 PH Stainless Valve Plates
If the plates are simply flat plates, you may want to try a fine grinding operation that uses opposing horizontal wheels. I've had excellent flatness results utilizing this technology. Note that this grinding process is the final operation after hardening.