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Rotary Hearth Furnaces up to 1300 °C with and without Air Circulation Electrically Heated or Gas-Fired

  Rotary hearth furnace DH 3020/1480/450/11, movable on rails, for preheating of molds for two forges Rotary hearth furnace DH 1200/-/300/11

Gear rim drive under the furnace

Rotary table with base plates made of highly heat-resistant steel to protect the insulation

Exhaust hood above charging opening

Pre-heating of steel rings for forging

Furnace floor can be lowered for maintenance purposes

The compact furnaces of the DH product line are optimally suited for continuous processes on a small floor space. They are designed for preheating processes such as the preheating of metal parts for forging. Charging and discharging can, be done at one position – either by a person or fully automatic. The hearth rotates in pre-set segments individually reconciled with the workpart geometry. The rotational speed and rotational intervals can be defined by the control system or by manual switching. The rotary hearth furnaces are specifically designed for the required throughput and charge dimensions. They are heated electrically or alternativelly gas-fired by means of powerfull gas burners. Subject to the temperature range these furnaces are equipped with or without air circulation.

  • Tmax 1100  °C, 1200  °C or 1300  °C without air circulation
  • Tmax 260  °C, 600  °C or 850  °C with air circulation
  • Wire heating elements in the furnaces ceiling for furnaces up to 1200  °C
  • SiC heating rods in the furnace ceiling for furnaces up to 1300  °C
  • Gas heating as an alternative to electrical heating
  • Models for 650  °C and 850  °C with powerful air circulation for better heat transfer onto the charge and to optimize the temperature uniformity
  • Very compact design compared with continuous furnaces
  • Designed for continuous operation at one working temperature
  • Table diameter up to 3000 mm
  • Hearth movement in defined segments
  • Low-vibration movement of the rotary hearth
  • Parallel swivel door
  • Motor-driven or rotational motion initiated by foot switch
  • Furnace floor can be lowered using a forklift truck for maintenance purposes

Additional equipment

  • Exhaust hood above the door opening for discharge of the warm exhaust air when door is open
  • Pneumatic drive of the parallel swivel door
  • Charging aids for ease of loading and unloading
  • Multi-zone control for adjustable thermal profile during the cycle
  • Protective gas connections
  • Process control and documentation with Controltherm MV software package
ModelTmaxInner dimensions in mmVolumeOuter dimensions in mmHeatingElectricalWeight
 °CØ OuterØ Innerhin lWDHpower in kW1connectionin kg
DH 1200/-/300/11 1100 1200 0 300 340 2200 2200 2500 54.0 3-phase 1000
DH 1500/800/250/11 1100 1500 800 250 630 2400 2300 2450 21.0 3-phase 1500
DH 3020/1480/450/11 1100 3022 1480 450 2500 4000 4000 2500 98.0 3-phase 3500
1Depending on furnace design connected load might be higher
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Continuous Furnaces Electrically Heated or Gas-Fired

  Continuous furnace D 700/10000/300/45S with chain conveyor for 950 °C, gas-fired Conveyor plant D 1600/3100/1200/55, consisting of annealing furnace, cooling station and conveyor system

Roller conveyor furnace N 650/45 AS for heat treatment of heavy workparts

Continuous belt furnace for bulk charges incl. water bath for quenching

Service window

Discharge of D 650/S

Continuous belt furnace for bulk materials in baskets

Drop bottom for quenching within 5 seconds

Continuous furnaces are the right choice for processes with fixed cycle times such as drying or pre-heating, curing or degassing, etc.. The furnaces are available for various temperatures up to a maximum of 1000 °C. The furnace design depends on the required throughput, the process requirements for heat treatment and the required cycle time. The conveyor technology (e.g. belt, rollers) is tailored to the required working temperature and the geometry of the charge. The conveyor speed and the number of control zones are defined by the process specifications.

Alternative furnace design subject to process specifications:

Conveyor concepts

  • Conveyor belt
  • Metal conveyor belt with adjusted mesh gauges
  • Drive chain
  • Roller conveyors
  • Pusher-type furnace

Heating systems

  • Electric heating, radiant or convection
  • Direct or indirect gas-firing
  • Infrared heating
  • Heating with the use of external heat sources

Temperature cycles

  • Control of working temperature across the whole length of the furnace, such as for drying or pre-heating
  • Automatic control of a process curve applying defined heat-up, dwell and cooling time
  • Control of a temperature curve including a final quenching of the charge

Process atmosphere

  • In air
  • In non-flammable protective or reactive gases such as nitrogen, argon or forming gas
  • In flammable protective or reactive gases such as hydrogen incl. the necessary safety technology

Basic configuration criteria

  • Conveyor speed
  • Temperature uniformity
  • Operating temperature
  • Process curve
  • Charge space width
  • Charge weights
  • Cycle time or throughput
  • Length of charge and discharge zone
  • Generated exhaust gases
  • Specific industry standards such as AMS, CQI-9, FDA etc.
  • Other individual customer requirements

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