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'[EE:] Induction Furnace'
2004\06\10@095953 by Thys

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Hi to all

Has any of you on the list played around with Induction Furnace designs.

My brother is a knife maker and this came up one day to make a small
furnace.

I need some serious pointers.

Thanks

Thys


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2004\06\10@102304 by Martin Klingensmith

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I've looked into this for casting. Usually refractory looped with a
water-cooled copper conductor, and a huge SCR resonant circuit to pulse
it at 15+ khz. You're making an air-core transformer, basically.
This is several times too big but you get the idea:
<cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3819708385&category=7287>
[It's a stack of 6 two-inch hockey puck SCRs with trigger coils and
snubber assemblies - water cooled]

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Martin Klingensmith
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http://nnytech.net/


Thys wrote:
{Quote hidden}

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2004\06\10@103239 by Jay Shroff

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Check out http://www.hvguy.com/
They have a schematic for an induction heater.
I have repaired a friends induction heating furnace and the design is pretty straight forward. Basically a SCR based inverter driving a water cooled coil.

I have wanted to build an Induction heating furnace for a while, I think the power sections would be relatively simple, but the induction coil design is what I cannot conceptualize.

Jay
{Original Message removed}

2004\06\10@110220 by Spehro Pefhany

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At 03:57 PM 6/10/2004 +0200, you wrote:
>Hi to all
>
>Has any of you on the list played around with Induction Furnace designs.
>
>My brother is a knife maker and this came up one day to make a small
>furnace.
>
>I need some serious pointers.
>
>Thanks
>
>Thys

Is an induction furnace really what a knife maker would want? I would
think a conventional furnace (well, controlled-atmosphere would be ideal)
would be superior, assuming you're talking about heat treating the
blade.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
spam_OUTspeffTakeThisOuTspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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2004\06\10@111257 by Sergio Masci

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Spehro Pefhany wrote:

>
> Is an induction furnace really what a knife maker would want? I would
> think a conventional furnace (well, controlled-atmosphere would be ideal)
> would be superior, assuming you're talking about heat treating the
> blade.

Depends how he uses it, maybe he wants to try zone refining?

Regards
Sergio Masci

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2004\06\10@112049 by Tom

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At 11:12 AM 6/10/2004 -0400, you wrote:
>Is an induction furnace really what a knife maker would want? I would
>think a conventional furnace (well, controlled-atmosphere would be ideal)
>would be superior, assuming you're talking about heat treating the
>blade.
>
>Best regards,
>
>Spehro Pefhany --"it's the network..."            "The Journey is the reward"

It certainly could do it.  A local farrier supply company here uses an
induction heater to heat-treat the jaws of hoof-nippers.  The worker holds
the work piece in the loop for a couple of seconds and it gets red hot
right now.  Then at the right color point, he quenches the tool in oil.

The heater has a 2 turn loop of copper driven by a large mercury vapor tube
affair with a big sign on the front warning not to apply power without
turning on the cooling water supply first.

The work piece is a fairly small total volume; a long knife blade might
pose the problem of getting it equally hot all along the edge so maybe an
oven furnace would work better... I'm sure the knife maker probably knows.
Tom

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