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  1. #1
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    Aug 2013
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    13 chrome turning

    Another Question on the machining side of 13%Cr material:



    Do you have a maximum machine speed to machine this type of material perhaps, based on your experience? (We currently machine at 134m/min with one type of insert and 112m/min with another type on the same material)



    Are there anything else that is crucial to machining this type of material with acceptable surface finish, for example max tool stick out or something that also needs to be considered?

  2. #2
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    Jun 2015
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    Re: 13 chrome turning

    hy, a while ago i prepared a long series setup, for a few months, in 41Cr4, 42-47hrc, cutting at 170M/min, using a mapped feed between 0.1 and 0.5mm/o, diametral doc 2.25

    i could have gone above 170M/min, but i did not wanna go beyond 2000rpms on the 250mm chuck ... i consider it to put to much stress on the spindle above that value, and also there was a long bar inside a spindle liner custom built

    changing inserts once/shift, etc

    using kyocera and walter, W and later D geometry, rad0.8 - 1.2 ... if you wish, i will look for more informations about those inserts

    toolholders had been modified, coolant holes had been increased, and also there were 2 coolant nozzle / cutting edge, one from above and another from below

    normally, few people look into such things, and in most cases having coolant on the top of the insert seems nice, but in reality it hits the chip, not the cutting edge ... this does not matter in most applications, because toollife seems to be ok, but when turning hard materials, such details can make a huge difference

    oh, yes, i almost forgot : coolant concentration was >10%, or, if you wish, coolant was much more concentrated then on a regular day, and it was making bubbles

    We currently machine at 134m/min with one type of insert and 112m/min with another type on the same material
    onestly, there is not so much difference between those 2 values

    max tool stick out
    during long setups i use to push specs really hard, and i noticed that a tool with less overhang will be more stable ... otherwise, the lathe will start to vibrate, just like when you move a heavy fridge or something, is a very unpleasant noise

    to achieve repetability and avoid re-checking the colisions, i use to write down offsets value, and also check them inside the program

    or something that also needs to be considered?
    i would say that you have to design the toolpath&cutting-specs in such a way, that minimizes chips tangling on the part / material / or tool ... i used to cut in reverse some toolpaths, modify them a bit here/there, etc

    you can't push a setup with chips tangling arround / kindly
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  3. #3

    Re: 13 chrome turning

    Still in Antarctica, eh??

  4. #4
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    Re: 13 chrome turning

    hy please, what do you mean by that ?
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

  5. #5
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    Aug 2009
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    560

    Re: 13 chrome turning

    Quote Originally Posted by deadlykitten View Post
    hy please, what do you mean by that ?
    cool cat with sense of humor?

  6. #6
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    Aug 2009
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    560

    Re: 13 chrome turning

    Quote Originally Posted by KnuckleBuster View Post
    Still in Antarctica, eh??
    1st part of the humor

  7. #7

    Re: 13 chrome turning

    Quote Originally Posted by machinehop5 View Post
    1st part of the humor
    He was banned from PM.............. DAMHIKT.

  8. #8
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    3143

    Re: 13 chrome turning

    yup, it was a few years ago my god, it was such a rigid experience ...
    Ladyhawke - My Delirium, https://www.youtube.com/watch?v=X_bFO1SNRZg

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