Case studies

Automatic machine for hardening of slewing bearing and tooth gear

Technical requirements

  • Hardening of internal/external raceway.
  • Hardening of double raceway.
  • Hardening of internal/external tooth gear.
  • No load/unload waste lost.
  • Low adaptive operation to pass from slewing bearing to tooth gear.
  • Low setup time machine.
  • Automatic inductor cleaning procedure.
  • Hardening control process parameters.


  • Slewing bearing with diameter from 300 to 1500 mm.
  • Raceway diameter up to 40 mm.
  • Tooth height up to 150 mm.


MTR1500_4ac_2P machine description:

  • Double hardening station, each with automatic self centring chuck.
  • Automatic self centring inductor-raceway.
  • Automatic tuning for constant air gap inductor-raceway.
  • Automatic self centring inductor-tooth.
  • Automatic cycle for double hardening raceway.
  • Automatic “recovery” cycle for tooth by tooth hardening.
  • Circular scanner hardening process for raceway.
  • Vertical scanner hardening process for tooth.
  • Hardening power unit 150 kW – 10 – 15 kHz.
  • Station for automatic cleaning of inductor.
  • No lost time for load/unload operation.
  • Complete control parameter integrated for both hardening process.
  • Setup up time: 15 minutes.