Rolling bearing
Rotary hearth furnace for forging industry
| Oven temperatures | 1.250 °C |
| Heating capacity | 8.000 kg/h |
| max. oven load | 70.000 kg |
| Heating | Direct natural gas recuperative burner |
| Oven atmosphere | Flue 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 walkways.
Push-through gas carburizing plant
| Oven temperatures | max 980 °C |
| Heating capacity | 1.500 kg/h |
| Batch weight | max. 380 kg |
| Batch dimension | 650 x 650 x 650 mm (L x W x H) |
| Heating | Natural gas recuperator burner in the radiant tube |
| Furnace atmosphere | Endogas / nitrogen |
| Carburizing capacity | at 0.2 mm -> 1,500 kg/h at 0.8 mm -> 700 kg/h at 1.2 mm -> 350 kg/h |
Furnace system consists of the following assemblies:
- Transport line with loading & unloading
- Pre-oxidation furnace
- Gas carburizing furnace
- Oil quenching bath
- Washing machine
- Tempering furnace
Roller hearth furnace
| Oven temperatures | max. 900 °C |
| Heating capacity | 100 kg/h |
| Batch weight | 5 kg |
| Batch dimension | 300 x 300 x 50 mm (L x W x H) |
| Heating | Indirect electric heating |
| Furnace atmosphere | Nitrogen / Methanol |
The gas-tight furnace has a hot gas circulator, a methanol splitter and a gas supply panel for propane, air, nitrogen and methanol.
The furnace has a heated furnace length of 3000 mm with a door at the inlet and outlet. The oil bath is equipped with a lowerable roller conveyor which feeds the charges to the downstream washing process.
Austenitizing furnace with hardening press
| Oven temperatures | max. 900 °C |
| Heating capacity | 100 kg/h |
| Batch weight | 8 kg |
| Batch dimension | 240 x 240 x 50 mm (L x W x H) |
| Heating | Indirect electric heating |
| Furnace atmosphere | Nitrogen / Methanol |
The furnace system consists of:
- Loading
- Roller hearth furnace
- Hardening press
- Unloading
The furnace has a hot gas circulator, a methanol splitter and a gassing panel for propane and air, nitrogen and methanol. The furnace has a heated furnace length of 3000 mm with one door each at the inlet and outlet.
Roller hearth furnace for bainitizing
| Oven temperatures | max. 930 °C (austenitizing furnace) |
| Throughput capacity | up to 600 kg/h |
| Batch weight | 50 kg bulk material in annealing baskets |
| Batch size | 750 x 750 x 150 mm |
| Heating | Natural gas recuperative burner in radiant tube |
| C-level | 0,1 - 0,8 |
| Atmosphere | Nitrogen / methanol |
| Quenching & removal from storage | max. 400 °C under salt |
| Heating | Electric heater |
The austenitizing furnace is part of a fully automated heat treatment plant with upstream & downstream processes, such as loading & unloading, pre & salt washing, and drying and weighing. The furnace is equipped with an inlet lock and is directly connected to the salt quench bath.
Roller hearth furnace with vacuum lock
| Oven temperatures | max. 550 °C |
| Heating capacity | 1.200 kg/h |
| Batch weight | max. 650 kg |
| Batch dimension | 930 x 850 x 850 mm (L x W x H) |
| Heating | Indirect electric heating |
| Furnace atmosphere | Nitrogen |
The gas-tight roller hearth furnace is used for heat treatment in a protective gas atmosphere (nitrogen) up to a temperature of 550°C.
The vacuum locks are pumped out to 0.1 mbar via a central vacuum pumping station and then flooded with nitrogen.
The roller hearth furnace is electrically heated and divided into 3 heating zones.
In the cooling station, the annealing material is cooled under inert gas to prevent oxidation.