Air Circulation Bogie Hearth Furnaces, Electrically Heated or Gas-Fired
Bogie hearth furnaces with powerful air circulation are used when an optimal temperature uniformity in the low temperature range is required. They are particularly useful for processes like glass tempering or cooling. With the wide range of additional equipment the furnaces can be individually adapted to the individual process.
-Tmax 600 °C or 850 °C -Dual shell housing with rear ventilation provides for low shell temperatures for the 850 °C models -Swing door hinged on the right side -Heating from chrome steel heating elements in the intake area of the air circulation system for the 600 °C models -Heating from three sides (both side walls and the trolley) for the 850 °C models -High-performance air circulation fan with vertical circulation -Temperature uniformity up to ∆T 10 K according to DIN 17052-1 -Bottom heating protected by SiC tiles on the bogie providing level stacking surface for the 850 °C models -Furnace chamber fitted with inner sheets made of stainless steel 1.4301 for 600 °C models and of 1.4828 for 850 °C models -Insulation structured with high-quality mineral wool for 600 °C models -Insulation made of high-quality, non-classified fiber material for 850 °C models -Bogies with flanged wheels running on rails for easy and precise movement of heavy loads -Electric chain-driven bogie in combination with rail operation for smooth movement of heavy loads from model W 4800 -Over-temperature limiter with manual reset for thermal protection class 2 in accordance with EN 60519-2 as temperature limiter to protect the furnace and load
Additional equipment -Direct gas heating or upon request with indirect gas heating with radiation tube -Custom-built sizes -Electric chain-driven bogie in combination with rail operation for smooth movement of heavy loads up to Model W 4000 -Optimization of the temperature uniformity up ∆T 6 K according to DIN 17052-1 -Bogie running on steel wheels with gear rack drive, no rails in front of the furnace necessary -Different possibilities for an extension to a bogie hearth furnace system:Additional bogies -Bogie transfer system with parking rails to exchange bogies running on rails or to connect multiples furnaces -Motor-driven bogies and cross-traversal system -Fully automatic control of the bogie exchange -Electro-hydraulic lift door -Motor-driven exhaust air flaps, adjustable via the program -Uncontrolled or controlled cooling system with frequency-controlled cooling fan and motor-driven exhaust air flap -Multi-zone control adapted to the particular furnace model provides for optimum temperature uniformity in the 850 °C models -Commissioning of the furnace with test firing and temperature uniformity measurement (also with load) for the purpose of process optimization -Designed for Tmax 950 °C, fan blade driven indirectly via a belt to protect the air recirculation motor against over-heating -Process documentation and control with Controltherm MV software package and the Nabertherm NCC control center for monitoring, documentation and control
These fast-firing decoring furnaces with infrared heating are especially suitable for decal firing of glass or ceramics at working temperatures up to 900 °C. The furnace is equipped with two manually movable tables on castors for easy handling. Both tables and the furnace chamber are insulated with fiber materials. With the fiber insulation in combination with the infrared heating, which provides for a fast surface heating, the furnace achieves particularly short process cycles.
Depending on the charge type the tables may be charged in several layers what allows for an optimal use of the available space. The charge surface with applied decal should face towards the heating elements which are positioned in the roof. While one charged table is positioned in the furnace the other table can already be charged outside the furnace. If the charge permits, the table with still warm charge can be driven out of the furnace and the other table is pushed into the furnace to use the residual energy.
To vent the exhaust gases generated during decor firing, the furnace is equipped with a motor-driven exhaust gas flap which can be activated via the controls. The stainless steel exhaust hood which is positioned above the motor-driven flap will be connected to customer’s ductwork.
-Infrared heating elements in the roof with reflectors installed on each table -Insulation made of non-classified fiber materials provides for fast process cycles -Process times of hardly three hours from cold to cold possible, depending on the charge and the working temperature -Alternating table system on castors, very easy to move -Motorized exhaust-gas flap on top of the furnace with stainless steel exhaust hood -Easy-to-operate controls
The models N 31/H ff. have been specially developed for preheating of moulds but also for hardening jobs when toolmaking.
-Compact, robust design -Three-sides heating: from both side walls and floor -High-quality, free-radiating heating elements mounted on support tubes for longest service life -Bottom heating protected by heat conducting SiC tiles -Parallel guided downward swinging door (user protected from heat radiation) -Stainless steel upper door jamb protects furnace structure when furnace is opened hot -Exhaust opening in the side of the furnace, or on back wall of furnace in the N 31/H models and higher -Temperature uniformity up to ∆T 20 K according to DIN 17052-1 -Low energy consumption due to multi-layer insulation -Gas spring dampers provide for easy door opening and closing -Heat resistant zinc paint for protection of door and door frame (for N81 and larger)
The furnaces in the GF75 - GF 1425 product line were conceived for professional glass artists. The heating elements, closely arranged, protected in quartz tubes, ensure a very high degree of temperature uniformity during fusing or during bending across the whole table surface. The optimized insulation, made of non-classified fibrous material in the furnace hood and robust lightweight refractory bricks in the furnace floor allow clean and safe operation. High current connection capacities assure that the furnace can be rapidly warmed up. The complete firing sequence is controlled by the intuitively operated Controller P300.
-Tmax 950 °C -Heating element, protected in quartz tubes -High current connection capacities for short warm-up times and energy-saving way of working -Arranged closely beside each other on the top, heating elements ensure direct and uniform radiation of the glass -Level table surface with insulation made of robust lightweight refractory bricks and marked charge surface -Hood insulation made of non-classified ceramic fibers for rapid warming up and cooling down -Solid state relays provide for low-noise operation -Fast power switching for precise temperature uniformity -Type “K” (NiCr-Ni) thermocouple inside the furnace chamber for precise temperature measurement -Double-wall, adjustable hood made of structured stainless steel with lid made of perforated sheet metal -Attractive and professional design enhances your image -Hood very easy to open and close, supported by high-quality compressed-gas springs -Adjustable, large quick-release fasteners - can be used while working in gloves -Large handles on the left and right side of the hood for opening and closing the furnace -Angled sight ports with plugs let you see the progress of your work and cool quickly -Robust base on rollers (two of them can be locked down) with tray for glass and tools -Controller integrated to save space on the right side of the furnace -Other sizes or custom designs available on request -Comfortable charging height with base of 870 mm -Exhaust air flap on hood for rapid cooling as additional equipment
Product category: Furnaces for chemical pre-tempering of glass
TS 20/15 - TSB 90/80
Chemical hardening is mostly applied for the solidification of thin glasses with a thickness of up to 3 mm. Chemical pretensioning is recommended because the surface flatness can be maintained. Producers of copy machines, solar modules, microwave devices, measuring instruments as well as companies in the lighting industry, the automotive industry and other users of flat glass need to apply the toughest possible glass in their products. Nearly all glasses containing a large percentage of sodium can be strengthened by means of ion exchange.
-Tmax 750 °C or 1000 °C in the salt bath -Safety technology according to EN 60519-2 -Useful for heat treatment of steel -Bath temperature control -Electric (TS) all-round heating or gas heating (TSB) -Removable collar plate made of solid steel -Insulated swing-a-way lid -Temperature uniformity up to ∆T 4 K according to DIN 17052-1 in the bath -Over-temperature limiter in the furnace chamber to prevent dangerous conditions for the furnace or personnel -Bath control of salt bath and furnace chamber
Crucibles -Type P: low carbon steel, CrNi plated and corundum coated for carburizing baths up to 950 °C, neutral salt and annealing baths up to 850 °C -Type C: high alloy CrNi steel for neutral salt and annealing baths up to 1000 °C and for dip brazing of Aluminium
Additional equipment -Exhaust gas collection at rim for connection to an exhaust system -Custom dimensions -Enhanced safety systems for heat treatment of aluminium and magnesium in the salt bath with second over-temperature limiter and PLC-bath control with thermocouples in the salt bath and in the furnace chamber
Nabertherm with 400 employees worldwide have been developing and producing industrial furnaces for many different applications for over 60 years. As a manufacturer, Nabertherm offers the widest and deepest range of furnaces worldwide. 150,000 satisfied customers in more than 100 countries offer proof of our commitment to excellent design, quality and cost efficiency. Short delivery times are ensured due to our complete inhouse production and our wide variety of standard furnaces.
Setting Standards in Quality and Reliability
Nabertherm does not only offer the widest range of standard furnaces. Professional engineering in combination with inhouse manufacturing provide for individual project planning and construction of tailor-made thermal process plants with material handling and charging systems. Complete thermal processes are realized by customized system solutions.
Innovative Nabertherm control technology provides for precise control as well as full documentation and remote monitoring of your processes. Our engineers apply state-of-the-art technology to improve the temperature uniformity, energy efficiency, reliability and durability of our systems with the goal of enhancing your competitive edge.
Global Sales and Service Network – Close to you
Centralized engineering and manufacturing and decentralized sales and service define our strategy to live up to your needs. Long term sales and distribution partners in all important world markets ensure individual onsite customer service and consultation. There are various reference customers in your neighborhood who have similar furnaces or plants.
Large Customer Test Center
What furnace is the right choice for this specific process? This question cannot always be answered easily. Therefore, we have set up our modern test center which is unique in respect to size and variety. A representative number of furnaces is available for tests for our customers.