The photo shows the hardening station of our induction hardening machine
for construction machinery slew bearings.

The section hardened is the inner gear inside the ring.
This machine can treat parts up to 1300mm in diameter
and over 250kg in weight.

In the photo, the workpiece is lifted by the receive jig into the ring-shaped coil,
which induction heats the gear inner circumference.

After heating, the jig carries the workpiece down and submerges it
in the quenching water tank. There it is sprayed by quenching water jackets
to achieve even quenching.


While induction hardening of large gears can cause cracking and runout,
our machine achieves an even casing by heating the workpiece in two stages,
preheating and main heating, and quenching using our dip-spray method.