Contract Hardening

Conveyor belt furnace for bainitizing springs

Oven temperatures950 °C
Heating capacity100 kg/h
Part weight4 kg
Throughput dimensions (width x height)500 x 60 mm
HeatingIndirect electric heating
Oven atmosphereNitrogen / methanol

The furnace is divided into three heating zones with 6 heaters each, as well as a methanol splitter with 3 heaters located at the outlet drop shaft. A hot gas circulator circulates the protective gas atmosphere.

The belt runs over running and deflecting rollers as well as a tensioning device with guide rollers at the kiln inlet.

A height-adjustable bulkhead plate, as well as a flame curtain, is provided for the furnace inlet. Depending on the workpiece height, the kiln inlet can thus be adjusted to prevent heat loss.

The furnace outlet is formed by a drop chute. Through this, the workpieces fall from the belt directly into the salt bath below.

The furnace walls and floor are insulated with lightweight refractory brick, the dropout shaft with refractory brick, and the ceiling with ceramic fiber.

Tempering furnace for stabilizers

Oven temperatures200 - 400 °C
Heating capacity1.000 kg/h
Part weight5 kg
Passage width1.700 mm
HeatingDirect cold air gas burner with infinitely variable output control

The track width of the two-strand chain conveyor is variably adjustable between 450-750mm and is driven by a servo motor. Thus, different stabilizer types can be driven through the plant.

The furnace is equipped with 3 heating zones, each of which is equipped with 2 adjustable cold air gas burners and a hot gas circulator.

The cooling module can be structurally separated from the furnace or directly integrated into the furnace transport system.

Tempering furnace for axle springs

Oven temperatures350 - 450 °C
Heating capacity4.800 kg/h
Part weight5 kg
Passage width1.350 mm
HeatingDirect cold air gas burner with infinitely variable output control or electric heating

The parts run through the oven in multiple strands. The drive cycles through the 4 heating zones, each of which is equipped with a hot gas circulator.

Loading & unloading can be done by robots as well as by manual loading.

Tempering furnace for profiles and pipes

Oven temperatures500 °C
Heating capacity1.000 kg/h
Part weight3 kg
Passage width2.200 mm
HeatingDirect electric heating

The round or profiled tubes are provided by the magazine. The tubes travel via the conveyor belt onto a roller conveyor. On their way into the furnace, the tubes are measured by a light barrier and positioned in the center of the furnace.

Controlled by a cam disk, the pipe is pushed onto the conveyor chain by a pneumatic pusher.

Complete kiln line including loading and unloading, as well as cooling station.

Chain furnace for hot forming

Oven temperatures400 - 600 °C
Heating capacity600 kg/h
Part weightvariable
Passage width400 x 800 x 200 mm (L x W x H)
HeatingDirect electric heating

Charged furnace grates or baskets are fed into or discharged from the furnace via pneumatic transfer cars. By means of corresponding loading recipes, a wide variety of batches can be parameterized for loading and unloading.

Conveyor chain furnace for warming up

Oven temperatures280 °C
Heating capacity600 kg/h
Batch weightvariable
Throughput dimensions (width x height)1.300 x 160 mm
HeatingDirect electric heating

The carriages are transported through the oven via two steel conveyor chains. Incremental encoders at the chain deflections allow the transfer positions of the carriages to be transferred to robots or gantry grippers with millimeter accuracy, irrespective of temperature and aging-related chain elongation.

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 transmission 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.

Push-through carburizing system

Oven temperaturesmax 980 °C
Heating capacity1.500 kg/h
Batch weightmax. 380 kg
Batch dimension650 x 650 x 650 mm (L x W x H)
HeatingNatural gas recuperator burner in the radiant tube
Furnace atmosphereEndogas / nitrogen
Carburizing capacityat 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

Puncture hardening system

Oven temperaturesmax 930 °C
Heating capacity100 kg/h
Batch weightmax. 25 kg
Batch dimension300 x 300 x 300 mm (L x W x H)
HeatingIndirect electric heating
Furnace atmosphereAmmonia

The furnace system consists of the following assemblies:

  • Loading
  • Vacuum lock
  • High temperature furnace with ammonia splitter
  • Oil bath
  • Unloading

Casting plate belt furnace

Oven temperaturesmax 960 °C
Heating capacity1.100 kg/h
max. belt load152 kg/m²
Part weight2 - 2.500 g
Throughput width annealing furnace1.200 mm
Throughput width tempering furnace1.400 mm
HeatingNatural gas recuperative burner in the radiant tube
Oven atmosphereEndogas / Nitrogen

The cast link conveyor is overlapped and manufactured in 1.4849. The furnace is equipped with lightweight refractory brick and ceramic fiber insulation and has space for 2 atmosphere circulation units.

  • N2 safety gassing
  • 3 inlet photocells to control the loading height (CQI-9)
  • Reversing – synchronous drive system with torque control

Chamber furnace with air circulation

Oven temperaturemax 350 °C
Batch weight2.000 kg
Batch size1,200 x 2,000 x 2,000 mm (L x W x H)
HeatingDirect electric heating

The compact chamber furnace can be loaded by forklift as well as by movable furnace grate. The furnace door can be moved and pressed on by electric motor. The chamber furnace forms the core for the following modular expandable equipment:

  • Air quench / air shower
  • Water/polymer quenching
  • Charging equipment
  • Chamber furnace line

Chamber furnace with quenching bath

Oven temperaturesmax. 560 °C
Heating capacity1.200 kg/h
Batch weight1.500 kg
Batch size1,200 x 1,500 x 1,500 mm (L x W x H)
HeatingDirect electric heating

The furnace system is fed via the water quench bath using a forklift truck. The water quenching bath has a hydraulic lowering platform and can be tempered between 40 and 85°C by means of electric heating and tube cooling. The batch is transported from the chamber furnace to the quenching bath by means of a push chain. The conversion time is less than 25s. The furnace system is used for solution annealing of aluminum parts.

Chamber furnace with protective gas generator

Oven temperaturesmax. 750 °C
Heating capacity1.100 kg/h
Batch weight2.000 kg
Batch size2.000 x 2.000 x 2.000 mm (L x B x H)
Heatingdirect electric heating
Furnace atmospherevia exogas generator
CO = 1 - 5 %
H² = 1 - 5 %
O² = max. 5ppm
N² = remainder

The furnace system consists of a gas-tight chamber furnace and an exogas generator. The furnace has an air-to-air tube cooler. The furnace door is opened laterally by an electric motor and can be pressed on pneumatically to make it gas-tight.

Activation furnace

Oven temperaturesmax. 500 °C
Heating capacity250 kg/h
Batch size800 x 700 x 400 mm (L x W x H)
HeatingDirect electric heating
Process gasAmmonia
Process fluidTetrachloroethene
Safety purge gasNitrogen

The activation plant is used to remove the passivating metal oxide layer from stainless steel workpieces. This is necessary in order to be able to carry out a nitriding process and obtain a hard surface. Depending on the shape and size of the workpieces, they are brought into the treatment room in baskets or charging racks.

Roller hearth furnace

Oven temperaturesmax. 900 °C
Heating capacity100 kg/h
Batch weight5 kg
Batch dimension300 x 300 x 50 mm (L x W x H)
HeatingIndirect electric heating
Furnace atmosphereNitrogen / 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 temperaturesmax. 900 °C
Heating capacity100 kg/h
Batch weight8 kg
Batch dimension240 x 240 x 50 mm (L x W x H)
HeatingIndirect electric heating
Furnace atmosphereNitrogen / 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 aluminium parts

Oven temperaturesSolution annealing max. 560 °C
Heating capacityAgeing max. 300 °C"
Batch weight6,000 kg/h
Batch sizemax. 2,000 kg
Heating1,000 x 2,000 x 2,000 mm (L x W x H)

The roller hearth furnaces are components of a fully automated heat treatment plant for aluminum parts. The modular roller hearth plant can be individually adapted to the required heat treatment specification. The plant can also be set up in line or in a U-shape. A subsequent extension or increase in capacity can be achieved by branching or adding modules.

Batch tracking in combination with heat treatment recipe management allows different components to be treated simultaneously in the furnace system.

Roller hearth furnace for bainitizing

Oven temperaturesmax. 930 °C (austenitizing furnace)
Throughput capacityup to 600 kg/h
Batch weight50 kg bulk material in annealing baskets
Batch size750 x 750 x 150 mm
HeatingNatural gas recuperative burner in radiant tube
C-level0,1 - 0,8
AtmosphereNitrogen / methanol
Quenching & removal from storagemax. 400 °C under salt
HeatingElectric 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 for forging industry

Oven temperaturesmax 920 °C (annealing)
max 600 °C (ageing)
Heating capacity6,000 kg/h
Batch weightmax. 350 kg
Throughput width HTO1,200 mm
Throughput width NTO2,400 mm
HeatingDirect natural gas recuperative burner

The plant is used for quenching and tempering of steel plates at a working temperature HTO of 870°C to max. 920°C, quenching with water and subsequent stress-relieving annealing at a working temperature NTO of 250°C to max. 500°C.

The parts pass through the furnace system in a charge length of max. 1600 mm and a weight of max. 350 kg. They pass through the following plant components:

  • Loading
  • Austenitizing furnace
  • Water quenching bath
  • Cross transfer car
  • Tempering furnace
  • Aftercooling station
  • Unloading

Curing furnace for wire enamels

Oven temperaturesmax 175 °C
Heating capacityapprox. 3,000 kg/h
Batch weightapprox. 450 kg
Batch size1,400 x 700 x 420 mm (L x W x H)
Heatingdirect electric heating

High-convection ovens for preheating, gelling and final curing of thermosetting insulating resins enable the achievement of high insulation strength as well as crack and thermal shock resistance by applying product-specific process parameters.

Precise temperature control during the entire treatment time. Fully integrated process and product monitoring systems supported archiving of component and process related parameters and data. Redundant and software-supported temperature measurement systems continuously control and monitor the heat treatment process.

Heat recovery functions are an elementary component of the energy concept.

The low-maintenance and reliable process technology guarantees high plant availability.

Process-related solvent concentrations in the furnace atmosphere are specifically kept below permissible limits, safely treated and discharged.

Roller hearth furnace with vacuum lock

Oven temperaturesmax. 550 °C
Heating capacity1.200 kg/h
Batch weightmax. 650 kg
Batch dimension930 x 850 x 850 mm (L x W x H)
HeatingIndirect electric heating
Furnace atmosphereNitrogen

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.