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Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1714
2bytes wrote ...
Cool. At 5MHz the depth of penetration (and thus the area where I2R heating takes place) will only be a few 10s of μm depending on the R of the work piece. You can really see that in the video too. The rod appears to be heated red hot but when removed it almost immediately cools because the internal temp was nowhere near the temp of the skin. Great demo!
That's the main feature of "induction hardening", which has been used in factories since the 1940s or earlier. You can heat treat the wear surface of a gear, without distorting or making the core brittle. Here's a video where the quench (rapid cooling) is by conduction to the core. Here's one where they hose down the workpiece (and work coil).
[edit] Even better: a spectacular combination of both! And induction heat for progressively bending steel pipe with 100 mm wall thickness.
To zilipoper: great work. You may inspire many first-time inductioneers. Maybe me.
Registered Member #2063
Joined: Sat Apr 04 2009, 03:16PM
Location: Toronto
Posts: 352
Tigeris wrote ...
I have a very dumb question. The input voltage...is it AC or DC? Sorry for the noob questions
most definately DC lol
i just build this circuit, it was oscillating at 3.8Mhz with a 0.5nF silver mica cap going from drain to source (at first i used a ceramic cap and it got too hot so i swapped it) takes about 50W on standby and 60W with a screw driver inside the coil and the 10uF electrolytic cap was pretty hot to touch, scared that it might explode
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Mini induction heater IRFP460 5 MHz
