The machine is intended primarily for hardening of spur and bevel gears.
After having been heated to the required hardening temperature, gears are quenched between appropriately profiled dies which remain under hydraulic pressure during the quenching process and direct the flow of quenching oil around the gears.
The upper die with centering ram is provided with an inner and an outer compression ring onto which different pressures are exerted. On these machines, workpieces are not only cooled at a very even rate, hardening distortions are also kept within very close tolernaces.
Different automatic quenching programmes with pre-cooling and quenching, as well as with or without warm straightening prior to quenching can be preselected to suit specific requirements.
The generous, preselectable volume of quenching oil available and an efficient heat exchanger allow the machine to operate at a very high degree of efficiency.
Quenching dies can be exchanged effortlessly and safely within a relatively short time.

AH400DN machine has a loading platform at the front for loading of gears.