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Induction melting of steel - melting time calculation

Discussion in 'Electrical Engineering' started by James H., Dec 18, 2005.

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  1. James H.

    James H. Guest


    We're trying to size a small induction melting furnace (similar to those
    used in the jewelry making industry) for our application and I was wondering
    if anyone with some experience in this subject can help answer the following

    How long would it take to melt 3.5 lbs of 4140 Steel (2"Dia. x 4"L bar at
    1600 deg. C, 7.8 g/cc) with a 10 KW medium frequency (10-30Khz) water-cooled
    induction melting machine using the proper crucible (350 cc capacity)? Are
    there any other factors missed here that would influence this calculation?

    Here's a typical small melting furnace (this one is 9.5 KW):

    Thanks in advance,
  2. Setanta

    Setanta Guest

    It wouldnt take very long at all - The frequency you are using will give a
    small skin depth - probably more suitable to case hardening.
    The coil design is the crucial element and the amount of turns and volume of
    copper. Usually these systems adjust the frequency of the output depending
    upon the load (coupling). This can be a drawback depending upon how much
    flexibility you want from the machine(frequency control)....power factor
    correction capacitors are some help in changing the output frequency......

    I can give you some detailed calcs if you require

  3. James H.

    James H. Guest

    That would be much appreciated.

  4. Ardent

    Ardent Guest

    X-No-Archive: yes

    Please do. I am also equally interested in this subject, trying to
    make a tiny furnace to melt about 100-250 gms per shot.

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