progressive induction hardening (or flame hardening) - hardening junction
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Posted by: ciccioic ® 11/02/2009, 17:41:27 Author Profile eMail author Edit

Hello! Is there anybody who can explain me something about the progressive induction hardening? The question is: when I use the progressive induction hardening on a ring (made in appropriate material, in quenched + tempered state), there is a zone (at 360°) where I have to pass over an already hardened part for "closing the circle". What happen in the "re-hardened" zone? Will the hardness increase or decrease? Will the deep of hardness increase? What about the residual stress in that zone, will be better or worse? And what will happen to the close zones which will be wormed for conduction? Will they be anelled or tempered? Thanks a lot for the answer. .m

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: progressive induction hardening (or flame hardening) - hardening junction
: progressive induction hardening (or flame hardening) - hardening junction -- ciccioic	Post Reply	Top of thread	Engineering Forum

Posted by: RWOLFEJR ® 11/05/2009, 15:26:06 Author Profile eMail author Edit

I'm not certain I'm following you but think I understand what you're asking...? In order to eliminate your concerns of overlapping and closing the circle etc I'd suggest this... Spin the ring during your scanning operation. That'll keep your heat and depth even as well as the reaction of your quench water following the heat. You can fabricate a so-so coil and get consistant results with it if the part is rotating at some constant rate. You'll need to tweak it etc. but when possible you want to spin to eliminate variations in coil and part positioning. If that doesn't help you or doesn't apply to your situation my next thought is that you need to run a part and test it.

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: : progressive induction hardening (or flame hardening) - hardening junction
: : progressive induction hardening (or flame hardening) - hardening junction -- RWOLFEJR	Post Reply	Top of thread	Engineering Forum

Posted by: Kelly Bramble ® 11/05/2009, 17:04:29 Author Profile eMail author Edit

Yes, spinning the part is a common practice, see: http://www.engineeringmotion.com/videos/350/induction-hardening http://www.engineeringmotion.com/videos/352/induction-heating-induction-hardening-pins http://www.engineeringmotion.com/videos/353/induction-hardening-brake-shoes http://www.engineeringmotion.com/videos/351/induction-hardened-crankshaft Modified by Kelly Bramble at Thu, Nov 05, 2009, 17:06:43

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