Lathe - Dynamic Turning - Inconel 718

Started by neurosis, February 01, 2022, 05:53 AM

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neurosis

February 01, 2022, 05:53 AM
I have a couple of questions about a part that we may potentially try dynamic turning on.  It seems like this is a perfect candidate.

The unknowns to me are

1) who makes a good button profiling/grooving tool?

2) Do they work worth a shit in 718 Inconel? 

Anyone on here have any experience with this type of turning in Inconel. 

I see that Ingersol and Iscar have a tool that may work




Here is the part profile that were working on. 

I'll go back to being a conservative, when conservatives go back to being conservative.

byte

#1
February 01, 2022, 05:58 AM
I use those more for working with uneven machining entities like a weld or a part with a cutout. I would think a left and a right tool would be better for the profiling.

neurosis

#2
February 01, 2022, 06:09 AM
You're not insinuating that the dynamic turning is just a sales gimmick?  :D 


I'll go back to being a conservative, when conservatives go back to being conservative.

JParis

#3
February 01, 2022, 06:17 AM
Quote from: neurosis on February 01, 2022, 05:53 AM1) who makes a good button profiling/grooving tool?

2) Do they work worth a shit in 718 Inconel? 

1 Greenleaf...Ceramic

2 Yes, very well...

Disclaimer....been several yeras(pre-dynamic path availability) but turning with Ceramics was always productive...

HTM01

#4
February 01, 2022, 06:32 AM Last Edit: February 01, 2022, 06:35 AM by HTM01
the kid i was training did a great job with prime turning inconel
like 4 hr turning to less than 45 minutes
he quit so i don't know what he did
he was working with someone from JP's old employer S4A (Cimquest)

byte

#5
February 01, 2022, 06:45 AM
Quote from: HTM01 on February 01, 2022, 06:32 AMthe kid i was training did a great job with prime turning inconel
like 4 hr turning to less than 45 minutes
he quit so i don't know what he did
he was working with someone from JP's old employer S4A (Cimquest)
I was about to say, the prime turning module always looked good to me..

neurosis

#6
February 01, 2022, 07:12 AM
The prime turning does look interesting. I'm not sure if we have any Sandvik tools in our lathe department.

I'll go back to being a conservative, when conservatives go back to being conservative.

HTM01

#7
February 01, 2022, 07:36 AM
Quote from: neurosis on February 01, 2022, 07:12 AMThe prime turning does look interesting. I'm not sure if we have any Sandvik tools in our lathe department.


i think that the Sandvik tooling was a major player in the outcome

crazy^millman

#8
February 01, 2022, 08:07 AM
Did a 10 ton part a few years ago and we had a 1 hour inspection on the process. It took 30 hours to rough the part on the VTL, but it worked great. We were using a 3/4 button insert. Machinist would turn the insert every hour and they were able to get 4 edges used before the insert was replaced.

TSmcam

#9
February 02, 2022, 11:23 AM
Quote from: neurosis on February 01, 2022, 07:12 AMThe prime turning does look interesting. I'm not sure if we have any Sandvik tools in our lathe department.



I've done a bunch of Prime Turning testing, using TopSolid, in conjunction with our local Sandvik technical rep, on both a Mori Seiki MT4000 M/T and an Okuma U3000. We got really good results, using the Sandvik tools. Well worth looking at.
CNC Softwares own 'lil piece of Poison Ivy.
TopSolid for the Win :)

byte

#10
February 02, 2022, 12:38 PM
Quote from: crazy^millman on February 01, 2022, 08:07 AMDid a 10 ton part a few years ago and we had a 1 hour inspection on the process. It took 30 hours to rough the part on the VTL, but it worked great. We were using a 3/4 button insert. Machinist would turn the insert every hour and they were able to get 4 edges used before the insert was replaced.
What kind of toolpath ddid you use Ron?

huskermcdoogle

#12
March 04, 2022, 06:25 AM
Dynamic turning with ceramics works really well, other than the fact that tool inspection won't pull you out in the middle of a pass. >:(   So for large parts where you have passes longer than the life capability of the tool you have to break it up in a way that a single pass or multiple there of doesn't exceed the 8-15 minute tool life mark for ceramic.  But that said, dynamic turning almost eliminates the depth of cut notch issues that you normally see with ceramincs in high temp, so you can run longer with better process reliability.  Material removal rates vs carbide are WAAAAAAY faster with ceramic.  You can remove what carbide does in an hour in about 7-10 minutes, easily once you get it dialed in.  So long as you have the RPM's to hit the surface footage requirements, (700 sfm+), I'd say go for it.

If you wanted a tool such as pictured, in ceramic, Top Clamping V-Bottom rounds will be best.  Make sure not to pull back on them.  Screw clamping with carbide such as pictured would work fine, just don't expect to break any speed records.  With a 1/2" round, you should be able to cut with a 10-20% stepover, and be able to feed around .008-.012ipr, anywhere from 150-300 SFM with decent PVD grade carbide.  My biased flavor would be Kennametal KCS10B  ;) .

Best of luck, I say go for it.
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