Rotary hearth furnaces

Rotary hearth furnace for forging industry

Oven temperatures1.250 °C
Heating capacity8.000 kg/h
max. oven load70.000 kg
HeatingDirect natural gas recuperative burner
Oven atmosphereFlue gas

In principle, the rotary hearth furnace consists of a fixed housing with two doors and a rotary ring hearth. The base for the ring hearth is embedded in the hall foundation.

Heating is provided by natural gas burners. The exhaust gas is drawn through recuperators integrated in the burner to preheat the combustion air. An exhaust gas fan draws the flue gas into a duct system and discharges it to the outside via on-site piping. A separating weir is installed between the loading and unloading doors. It thermally separates the heating area from the holding area. In case of repair, the separating weir can be removed upwards. To increase the service life of the refractory concrete, the separating weir is equipped with an air cooling system. It is protected against mechanical damage by light barriers.

Sealing between the rotating ring hearth and the stationary housing is provided by an inner and an outer water cup. Immersion swords project into the water cups and are attached to the ring hearth and the housing respectively.

The furnace superstructure and the area in the center of the housing can be reached safely via ladders and catwalks.

Rotary hearth furnace for gear shafts

Oven temperatures300 °C
Heating capacity500 kg/h
Batch weight2 - 5 kg
Batch size (length x diameter)400 x 150 mm
HeatingDirect electric heating

The workpieces are placed by robot through the door onto the support, which is connected to the slewing ring. The six-tier turntable is driven by a geared motor and rotated further by a certain angle of rotation so that an already heated workpiece can be removed.

To prevent excessive heat loss during loading and unloading of the tempering furnace, there are 3 furnace doors.

In the cooling section, the workpieces are cooled down and then placed on the discharge conveyor by means of robots.

Rotary hearth furnace with hardening press

Oven temperaturesmax 950 °C
Heating capacity500 kg/h
Batch weightmax. 50 kg
Batch dimension500 x 500 x 150 mm (L x W x H)
HeatingNatural gas recuperator burner in the radiant tube
Furnace atmosphereEndogas / nitrogen

The rotary hearth is loaded or unloaded through a portal on two levels. The components are transferred to the hardening press. Directly after this, the components are linked to the washing machine and finally to the belt tempering furnace with aftercooling section.