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Thread: Inconel 625

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  1. #1
    Join Date
    Jan 2007
    Posts
    52

    Angry Inconel 625

    Alright guys, need some help here.

    I am working in a Mori Duracenter 40 taper with Inconel 625 (approx 30 HRc), machining a 1" thick flat on the end of a 2" round bar. I have tried using a Garr 3/4" VHM Endmill (125-175 sfm @ .003-.0035 per flute), an Iscar T490 ELN D.75-3-W.75-08 with T490 LNMT 0804 P NR IC330 inserts (80-110 sfm @ .003-.004 per flute) and each one failed. I was doing .45" width cut, going from .100 deep to .500 deep then back to .100 deep (cutting across the part). have to cut the flat to 2.0" long. With the T490 cutter, I did it in two depth cuts with the first being at Z of .725" absolute ( Z0. is the center of the 2" diameter), the 2nd pass was set to Z .510" (which I didnt run due to the way the first depth cuts were going). The only thing I have working right now, and I say that loosely, is using an Ingersol 12J1E1581R01 4fl cutter with AOMT180508R IN1030 inserts, but the inserts are barely lasting 2 parts. Also I am machining this at .15" depth then .100" depth, running the length of the flat, not width.

    I have an Iscar FINISHRED endmill (EFSI-E44 500-1.0W500CF IC900) to try, but want some ideas before i waste another tool on this job.

    Attached is a pdf of the part, no dimensions though. the main body is 2.00" dia, the thickness of the flat is 1.00" and is 2.50" long.
    Attached Files Attached Files

  2. #2
    Join Date
    Dec 2008
    Posts
    28
    Do you ever ask your tooling distributor what to do in these instances or are they clueless, maybe we should ask warren buffet? 58 percent nickle and 21 percent chrome. I would say that your cutting speeds are too high because of the fact that this is a hardened ht alloy. I would take full DOC in one shot because you will work harden that material once you pass through. You can do that with a Varimill anyway, I would say that this Finishred gimick will not work and that the cobbs will bust off. ht alloys like smooth sharp cutting edges. Dont forget to use coolant, highest pressure possible, blowing chips away from the cutting area, climb cutting. Feeds also seem high on the account of the hardness of this material, I would stick to the 0.002-0.003 chip load, 50 to 80 SFM.

  3. #3
    Join Date
    Jan 2007
    Posts
    52
    Most of the time i get just the printed cutting conditions from the sales reps. The Iscar rep is at least getting me the tools as test tools, so if they don't work using their conditions, they will take them back and I don't have to pay for them. Will try slower SFM and feed.

  4. #4
    Join Date
    Mar 2013
    Posts
    0
    let's see how things turn up.

  5. #5
    Join Date
    Jan 2007
    Posts
    52
    Running full depth (.500) with .050" stepover, cutting at [email protected]. Sounds really good, endmill looked good after 50 passes ( one full cut ). Spindle load went from 6% to 11% back to 6% in the cut. Took 6 1/2 minutes to cut. Now for the test to see how long the endmill lasts. This was using the Iscar Finishred endmill.

  6. #6
    Join Date
    Jan 2007
    Posts
    52
    After two parts, the tool broke about 10 passes into the 3rd part. I just lowered the feed from 26.5 (.0047 base CL ) to 18.55 ( .0033 base CL ). Load meter is now pegging at 7 at max engagement.

    This tool lasted only 2 1/2 parts as well. Time to try something else.

  7. #7
    Join Date
    Apr 2012
    Posts
    43
    Try high speed machining?

  8. #8
    Join Date
    Jan 2007
    Posts
    52
    Thats what I was doing on the last set. I was doing a 2d High Speed Peel Mill.

  9. #9
    Join Date
    Apr 2012
    Posts
    40
    Maybe a tool with ceramic inserts. Run dry to avoid shocking the inserts.

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