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Drill recommendations for Inconel 625 sheet


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That is a tall order. Start with a coolant through carbide drill designed for stainless steels and heat resistant alloys, something like a OSG wdo-sus series. You are still going to need to spot chamf the backside to be completely burr free though.

Is laser drilling an option?

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Depending on the sheet thickness and hole size it might be worth looking at Mikron Cross Pilot drills.

170 degree point means unless the sheet is very thin you won't be breaking out before full diameter engagement, which is where the problem normally starts.......Use them all the time pilot drilling on an inclined surface in 625 and virtually burr free.

Sphinx do 3D through spindle drills but they are 140 degree point so again it will depend on hole size and sheet thickness, again very high quality holes. 

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On 10/23/2018 at 2:40 PM, Sticky said:

That is a tall order. Start with a coolant through carbide drill designed for stainless steels and heat resistant alloys, something like a OSG wdo-sus series. You are still going to need to spot chamf the backside to be completely burr free though.

Is laser drilling an option?

No laser drilling, unless the parts get drilled under-size and reamed after to remove heat affected edge, which kinda defeats the purpose of getting rid of the burr at the machine.


Particular part I'm looking at is .025" inconel sheet that has been formed in a coining die. Tried some MA ford carbide circuit board drills with a 170 deg tip and they worked ok... for about 20 parts then the burr got pretty horrible. That was just something to try because the drills were dirt cheap (for carbide anyway).

 

Now trying a powdered metal HSS/CO Nachi brand drill, TiCN coated. Only feeding at 3ipm, but looking promising. Got about 600 holes with the first one we tried before the burr got nasty. Tip geometry on those is just about perfect for inconel. Not too worried about speed on the drills at the moment, that's only about a minute of the 8 minute cycle even at 3ipm.

 

Next I need to figure out how to get the profile cutting time down, but looking like I just need to make a better fixture. Inconel flapping around during machining is no bueno.

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