prodSingleMainImgPlchldr Rotary Hearth Furnace refractory hard brick hearth and/or castable refractory hearth furnace, hardening or annealing, used for large pieces

Rotary Hearth Furnace

Rotary Hearth Furnace refractory hard brick hearth and/or castable refractory hearth furnace, hardening or annealing, used for large pieces
Rotary Hearth Furnace refractory hard brick hearth and/or castable refractory hearth furnace, hardening or annealing, used for large pieces
Rotary Hearth Furnace large piece products, hardening or annealing, product placed on solid refractory or alloy hearth, reliable
Rotary Hearth Furnace large piece products, hardening or annealing, product placed on solid refractory or alloy hearth, reliable
Rotary Hearth Furnace hearth in heated environment, refractory and/or castable refractory hearth furnace, hardening or annealing
Rotary Hearth Furnace hearth in heated environment, refractory and/or castable refractory hearth furnace, hardening or annealing

When you look to purchase anything in life, you always feel more comfortable when you go to the experts. Surface Combustion has more than 100 years of experience with thermal systems, The rotary hearth style of furnace allows for placement of large pieces or baskets of product onto a solid refractory or alloy hearth from which point they rotate like a lazy susan mechanism from the point of entry around in a horizontal circular motion until the rotation is complete. The load may be retracted through the same entry door or through a separate exit door near by the entry door. There are two styles of rotary hearth furnaces. The first has an open heat chamber, and the second has an enclosed cylinder in the center and is used where temperature uniformity is critical in the exiting pieces.

Rotary Hearth Furnace - Product Description

Surface® Combustion’s rotary hearth design starts with the hearth. It can be a refractory hearth made of hard brick and/or castable refractory or it can be an alloy hearth. The rotating hearth is sealed from the outside environment via oil or an oil substitute type of fluid. The drive of the hearth is via electric motor to a pinion which drives into arced segmented rack gears on the bottom of the hearth. It can also be via a chain wrapped around the hearth perimeter which is driven by a sprocket. This hearth arrangement is positioned inside of a heated environment. Heating can be via electric heating or direct or indirect gas firing. The loads can be processed in a stepped or semi-continuous fashion where the load moves one position at a time or in a true continuous fashion. Atmospheres can be endothermic (RX®), exothermic (DX®) or nitrogen. The processes performed are most often hardening or annealing. This furnace style is most often used when press or fixture quenching is desired. Automatic or manually actuated grippers reach into the furnace exit door and retract parts for placement into die press quenches. Here, parts such as ring gears are captured and restrained as they are quenched in oil or polymer to minimize distortion. This is the most common application of where a rotary hearth furnace is used. The operating temperature range is typically from 1400°F to 2200°F as this is a radiant/conduction style of heat transfer to the load.

Insulations used in the hot zone can be brick or fiber. Heating elements are traditionally rod overbend style that are electrically isolated from the steel casing. Gas fired models can include indirect heated radiant tube or direct fired burners.

Hearth style is selected based on the product range and the temperature of the process. Higher temperature annealing of stainless materials typically requires a refractory hearth to withstand processing temperatures over 2250°F. Lower temperature hardening applications most often use an alloy hearth.

Custom sizing 6’ to 80’ to meet your processing needs

Ceramic Fiber or Brick insulating systems 

Maximum operating temperatures up to 2250°F

Electric, direct gas fired (recuperative and regenerative) and radiant tube systems available 

Alloy or refractory hearth systems 

Controls meeting the requirements of AMS-2750 or CQI-9 can be provided as requested 

Wide speed control range

Automatic and robotic loading systems available

Recirculating fans available

Single- or multiple-door designs available

Multiple temperature zones available

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Aerospace Components

Aluminum

Bearings

Billet

Brass

Copper

Crankshafts

Gears

Rod Coil

Stainless Steels

Steel

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Load/Unload Tables

Quenching Systems

Atmosphere Generator

Control Systems

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There are furnaces, and then there are Surface® furnaces

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Ready to Get Started?

Please call us when you are ready to do discuss a new furnace, maintain, upgrade or replace your furnace or any part of your furnace. At Surface, we look forward to helping you with any thermal processing needs.

Call Surface with the following pieces of information ready to initiate your furnace solution.

  • furnace cyclecycle
  • furnace operationoperation
  • hours per yearhours per year
  • available spaceavailable space
  • operating temperature rangeoperating temperature range
  • heat sourceheat source

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(800) 537-8980

Need Support?

Please call us when you are ready to do discuss a new furnace, maintain, upgrade or replace your furnace or any part of your furnace. At Surface, we look forward to helping you with any thermal processing needs.

For Parts and Service have one or more of the following details regarding your furnace if possible:

  • Serial number
  • Drawing number
  • Photos of your furnace or parts for replacement
  • Spare parts list
  • Furnace rebuild history

Give Us A Call

(800) 537-8980