High Speed Machining - 718 Inconel

[sietevicio]

123

[enzt2002]

too fast-too hot.

[testtube43]

Has anyone tried Volumill ????

[bigbingham]

Go through tips like cheese.

[douro20]

It's also an Okuma machine- the rigidity is insane!

[stealhty1]

Inconel , isn"t it the metal used to make turbine blades ???

[jetpower06]

Hi there... I want to cut turbine wheels out of solid 718 soon. The problem is, that the milling tools are very small, typically less than 3mm outside dia. No chance to go in with inserts here. The machine has a high end spindle with up to 40'000rpm but very few torque. Any suggestions?

[bestamerica]

'

how come not use a cold white oil / water

[crazyj82]

@bestamerica With ceramic inserts, the thermal shock of any coolant would make the inserts explode.

[bestamerica]

crazyj82,

'

okay thank explain,,,

i see the air blower is good enough cooler

[capnjacksparrow1]

its quite self explanatory really-its all down to a few factors.. 1; the machine capabilities 2; the cutting inserts 3; WHAT TIME IS TEA BREAK?

[drummerboypaddy]

Germans rule! they know how to do that !...us milling tzee beginners ;-)

[alderaforall]

how much of this before your machine is a damn paper weight?

[theslimeylimey]

holy crap! that's not machining, it's grinding with a milling cutter LOL. Need a very solid and well controlled setup for that.

[shodanxx]

@SPUNKKK inconel is not a steel

it's a mostly zinc alloy, iconel 625 is the one I saw most inconel parts made out of

it's also a trademark, not a standardised way of naming an alloy like "6061-T6"

hardox is another trademarked secret-sauce steel alloy of some kind with possibly heat treat, hard to find raw data

[smacman68]

I used to work at a high end shop that serviced the Redstone Arsenal in Huntsville AL. We used to get orders for details made of this stuff. The most difficult material to work with. Worse than titanium is some regards. I just cant imagine cutting this crap @ 4000 SFM! We thought we were doing well @ 250! I guess if you have the right equipment, anything is possible. My hats off to your tooling vendor and tool engineer. What type (brand, model, year) CNC are you using?

[skwright69]

Is this a production run? If not i cant see how you can keep inserts in that thing, If your proving a point yeah i see it!! Wow thats some crazy stuff. keep it coming,

[nskendo]

quema las placas nomas saco wea

[divacica]

You should change the insert, buddy!!!!! :-))

[krausean]

ceramic inserts?

[chngjen]

i jus wonder wht temperature limit in the cutting tools. it's must up to 1500C.

[Daedalus0x1a4]

My jaw dropped when I saw this. I started machining with my Dad about a year ago. We machined some Inconel 625 parts together and we thought 100SFM was fast. hehe. Our machine is restricted to 4,000 RPM though.

[Jigglifier]

My jaw also dropped. I turned valves out of inconel +0 -.001 tolerance. 130sf/m and 1 corner per part roughing .012/rev .08 depth.

Those were the small ones .625dia about 3" long.

The bigger ones 4" matl roughed to 1.5" +0 -.003 about 12" long. Had to rough in phases took 4 corners to rough the part out.

I hate inconel!

Doesn't help that the shop would only buy Iscar carbide inserts meant for Stainless...

[farmfestmusic2]

its june 4th or New year day rsrsrsrsrs

[kawasakikillerr]

i love ceramic machining processes

[Abovegroundminer]

It's called friction milling!

[MILAGROSREGINA]

Muchas rpm, demasiada velocidad de corte

[LoDown1989]

Make sure you have a premium holder or it won't work. This was Big Plus from Big Kaiser. It has both face and taper contact. The holder is the easiest thing you can change to get more out of your machine. They are expensive and worth every penny.

[JTMarlin8]

Have you tried using a non big plus holder? The difference in rigidity is there, but in our experience, the difference is not night and day. You're still limited to the rigidity of the 40 taper spindle.

How much rigidity is required for what you're doing in the video? 4000 SFM with those kinds of feeds means your chipload is very small, well under .001 IPT.

I think the key to milling Inco at high speed is excellent concentricity, so a milling chuck is the key. Not the BBT/BCT.

[antboy824]

@LoDown1989 Ahh good ol "incohel"!

[Crookhorn75]

Guys for steady milling of Inconel i would reconmend using Stellram grade X500 in a ground style indexable insert. For Turning of Inconel use Stellram grade SP0819. If conditions are good and you have the capabilities using Sandvik ceramic inserts for turning large dia billiets is the answer.

[floringguy]

this is already a new world for me. from 79-93 i worked in machine shop and we used an alloy cr-ni-ti. that was look similar like this, in the chipbreaker slot sticked in and breaked everything:-) we used the casted version of this.. that was the real nightmare.. we had to make the edges just like for cast iron..but this material just don't want to get shaped on any way:-)) when the coolant was not enough or the speed was wrong a hss drill could be "welded" in the mat. that was the real fun:-))

[nuthinbuttrubl89]

I've used ceramics from sandvik on inco 718 at 3600 sfm. works out pretty well. I typically run my carbide around 175-210sfm for inco 600 and 625... 718 and 725 i'll run around 125-150 with good results.

[cheeseschrists]

what feed and d.o.c.?

[nfsommer]

depth of cut

[durka200]

is this Dale Mickelsons work?

[LoDown1989]

Yes it is

[SOFFEGOTTO]

insert kennametal ceramics?

[LoDown1989]

Yes, see posts below...

[parachute318]

holy cow hes melting it not cutting it incs allways been hard stuff

[albanianhub]

i hate when we have orders with inconel

stainless its not that bed but inconel its nightmare

[LoDown1989]

You must be doing it wrong. You have to have everything just right - the tool holder, tool and a very rigid, fast machine. Check if your machine has a big plus spindle, if so, you should use a big plus tool holder because it holds taper and face contact. You need a lot of ridgity in the holder to handle the vibration becuase you use very high speeds and basically melt the metal in the cut. If you do it right, it's like cutting aluminum - not a nightmare.

[Stephen1455]

What about on a manual lathe with very small parts? Would greatly appreciate any advice you can give me. I work for a scientific Institute and do lots of experimental work for scientists, they need materilas with very high melt points and good corrosive resistance, hydrogen atmospheres etc.

[troypilot]

Is that an Okuma?

[w123300tdt]

Green leaf inserts?

[LoDown1989]

No Kenemetal carbide, had to be done on ultra rigid machine and a Big Plus spindle and holder with dual contact tooling and holders.

[SOFFEGOTTO]

insert ceramics kennametal?