Special and Custom ovens

Leading Manufacturer of Industrial Ovens & Furnaces

Trusted, dependable, long-lasting equipment for over 75 years.

Since 1949, we’ve created ovens and furnaces that work for every industry,

BENEFITS OF PRECISION GEAR CUSTOMIZATION FROM THE ORIGINAL MANUFACTURER

For over 50 years, WM Berg has been the leader of premium precision gear engineering, production and manufacturing process automation. That’s what makes us the go-to source for questions around spec requirements, application objectives and precision part installation.

Pre-manufactured precision gears are well suited for applications powered by newer machinery. The value of custom OEM gears comes from extending the use of existing machinery, and providing greater flexibility to optimize mechanical operations as business needs evolve.

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ZongHeng offers a wide range of industrial ovens

Custom Ball Bearing Options

•Read more about considerations for finding the right customized design for your application:

时效： 时效炉用于增加合金的强度。
退火： 退火炉通过加热并保持适当温度，然后以受控速率冷却，使零件软化。退火用于降低硬度、增加延展性并帮助消除内部应力。
烘烤： 烘烤炉将物体加热到低温，以去除夹带的气体和水分。
煅烧： 煅烧炉产生相变或去除水分。
复合材料固化： 复合材料固化炉用于固化高强度、低重量的碳复合材料。
固化： 固化炉将产品质量和涂层材料升温至指定温度，并保持该温度一段时间。固化炉可固化零件、涂层和粘合剂。
干燥： 干燥炉可以去除材料或物体中的水或其他液体。
食品加工： 烘烤或固化以去除产品中的水分。
预热： 预热炉用于各种需要在成型、涂层、装配或焊接等二次加工之前加热产品的工艺。
粉末涂料： 涂上粉末涂料后，零件进入固化炉，在加热的作用下，涂层发生化学反应，产生重型涂层。
应力消除： 一种用于减少物体或材料内部残余应力的热处理工艺。
回火： 回火可降低金属的脆性，通常在硬化或淬火之后进行。

Aging: Aging ovens are used to increase the strength of an alloy.
ing Ovens create phase change or remove moisture.
Composite Curing: Composite curing ovens are used to cure high strength, low weight carbon composite materials.
Curing: Curing ovens raise the product mass and coated material to a specified temperature and holds this temperature for a set time. Curing Ovens cure parts, coatings, and adhesives.
Drying: Drying ovens remove water or other liquid from a material or object.
Food Processing: Baking or curing to remove moisture from the product.
Preheating: Preheat ovens are used in a variety of processes that require heating the product prior to a secondary process such as forming, coating, fitting or welding.
Powder Coating: After application of the powder coating, the parts enter a curing oven where, with the addition of heat, the coating chemically reacts to produce a heavy duty finish.
Stress Relieving: A heat treatment process used to reduce internal residual stresses in an object or material.
Tempering: Tempering decreases the brittleness of the metal and is usually performed after hardening or quenching.

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The first step in selecting a new industrial oven is to define the heat processing requirements and the application specifications such as floor space limitations, including ceiling height.

What is Heat Processing?

A combination of heating and cooling operations applied to a material to obtain desired conditions or properties.

The 3 Steps of Heat Processing:

Heating to a specified temperature
Holding at that temperature for the appropriate amount of time
Optionally, cooling according to prescribed methods

What is the difference between an industrial oven and a industrial furnace?

The heating temperature

Oven <1,000°F
Furnace >1,000°F
Air flow management system in the heating chamber will differ between an oven and furnace

What type of ovens are available for industrial use?

Batch Ovens are used for a wide variety of heat processes including drying, curing, aging, annealing, stress relieving, bonding, tempering, preheating, and forming. Batch ovens process products one at a time or in groups (“batches”). The part(s) are brought into the oven in batches on racks, carts, or trucks, and can be loaded manually or via automated loading.

Continuous Conveyor Ovens offer labor savings and material handling efficiency over typical batch processes. The part(s) are brought into the oven manually or by a machine. Conveyors can be overhead, belt (steel or fabric), powered roller, chain or slat. Conveyor ovens perform the same processes as batch ovens, but deliver a continuous throughput. Continuous ovens can include multiple zones operating at different temperatures and may include a cooling zone.

Will the oven be customized for my application?
Industrial ovens and furnaces are available in standard or custom models.

What heat processes can be done in an Industrial Oven?

Aging: Aging ovens are used to increase the strength of an alloy.
Annealing: Annealing ovens soften parts by heating to and holding at suitable temperature followed by cooling at a controlled rate. Annealing is used to reduce hardness, increase ductility and help eliminate internal stresses.
Baking: Baking ovens heat objects to a low temperature in order to remove entrained gases and moisture.
Calcining: Calcining Ovens create phase change or remove moisture.
Composite Curing: Composite curing ovens are used to cure high strength, low weight carbon composite materials.
Curing: Curing ovens raise the product mass and coated material to a specified temperature and holds this temperature for a set time. Curing Ovens cure parts, coatings, and adhesives.
Drying: Drying ovens remove water or other liquid from a material or object.
Food Processing: Baking or curing to remove moisture from the product.
Preheating: Preheat ovens are used in a variety of processes that require heating the product prior to a secondary process such as forming, coating, fitting or welding.
Powder Coating: After application of the powder coating, the parts enter a curing oven where, with the addition of heat, the coating chemically reacts to produce a heavy duty finish.
Stress Relieving: A heat treatment process used to reduce internal residual stresses in an object or material.
Tempering: Tempering decreases the brittleness of the metal and is usually performed after hardening or quenching.

A best practice for ensuring durability of your industrial oven is to have a discussion about the skills and expertise of the manufacturer’s build team to make sure that they have the experience to deliver a well-built industrial heat processing oven that will last for many years.

Section 4: Oven Construction Materials

When it comes to the design of industrial ovens and furnaces

the selection of construction materials is of the utmost importance.

The two most important decisions to make are what metal to use for interior and exterior construction, and what insulation materials to use in the walls, roof and floor when applicable.

Metals
Temperature and corrosion resistance are the top two factors to consider when choosing interior and exterior metal construction. Aluminized steel is the metal of choice for oven manufacturers in the temperature range up to approximately 1100°F. The aluminized steel coating offers excellent protection from temperature and allows for ease of welding during fabrication as opposed to galvanized. Manufacturers typically utilize aluminized steel on the exterior as well for additional corrosion resistance and ease of painting.
At temperatures above 1000°F, the design changes to a different construction type commonly referred to as “furnace construction”. Exterior construction is typically 3/16” hot rolled carbon plate with sufficient buck stays to contain an explosion. Per NFPA 86 this allows for the elimination of explosion relief panels. It also is a more robust construction typically necessary in an industrial heat treat environment. For superior corrosion resistance in ovens and furnaces up to 1500°F, 316 stainless steel is the most often selected material.

Insulations
The insulation of choice for oven applications up to 1000°F is mineral wool. Besides being economical, mineral wool offers excellent insulation and sound proofing characteristics while being very easy to install. It comes in various densities up to 10#/cu.ft. and typically has a thickness from 2” to 10” when installed. Its fire resistance is yet another feature of this type on insulation.
Above 1000°F, different types of insulations start to become necessary. The most common choice is ceramic fiber boards, blankets and modules. The standard ratings for these ceramic fiber materials are 1800, 2300, 2600 and 3000°F. In addition, firebricks and cast refractory are widely used in temperatures to 3300°F and above. There also various lightweight insulating boards available up to 3300°F.

Section 6: Heating Systems

There are primarily 3 different types of heating sources used in industrial processing ovens. These are most often referred to as direct gas fired, indirect gas fired and electric coil heaters. Direct fired heaters are generally more efficient and less expensive as there are fewer components in these systems. Although this is true, there are instances when an indirect gas fired heater or an electric heater is a better choice. Understanding the advantages of each system will aid you in understanding which system to use.

Heat Processing applications commonly use direct gas fired, indirect gas fired or electric coil heaters to heat the oven.

Direct Gas Fired Heaters

A direct fired heater uses natural gas, propane, butane or other gas mixtures to create an open flame for heating. The gas burners are designed to operate in a fresh flowing airstream. Gas is fed directly to the burner and the fresh airstream provides the needed oxygen for combustion.

Direct Gas Fired Heater Advantages

Efficient- since it is firing an open flame; almost all of the fuel is converted to heat in the chamber. These types of burners are rated at 92% efficiency.
Smaller footprint – since these burners do not use heat exchangers, they are able to produce more heat in a smaller footprint.
Flexibility – Direct fire burners have a higher turn down ratio. This allows for better temperature control and a larger temperature range than indirect burners.

Direct Gas Fired Heater Disadvantages

Combustion – combustion byproducts are introduced into the air stream. In certain applications, these byproducts could affect the users product.
Explosion Panels – since the byproducts are introduced into the work stream of the oven/furnace, extra cost and design input is needed to design explosion relief into the product equipment or specific explosion relief panels in the equipment.
Exhaust – a powered exhaust is needed in the oven/furnace to remove byproducts and water from the combustion process.
Purge time – Before starting or re-firing a direct gas burner, there is a wait time (purge time) where a specific volume of air in the system needs to be purged.

Section 7: Conveyor Belt Options

The 4 Best Conveyor Belt Types for Heat Processing

As more and more companies seek to automate their processes and facilities, a conveyor oven is a small, yet important cog in the wheel of product manufacturing. While batch processing will always have its place, continuous process conveyor ovens are in high demand as manufacturers strive to maximize efficiencies in their production processes.

There are a wide variety of conveyor types to choose from:

Belt conveyors
Chain conveyors
Roller conveyors (powered, gravity)
Screw/Auger
Elevators/Elevating conveyors
Feed systems (vibratory, centrifugal, etc.)
Pneumatic conveyors
Vacuum conveyors

However, many of these conveyor types are not viable solutions in the presence of heat. High process temperatures limit conveyance material options and eventually force drive components (ie: bearings, drive chain and motors) outside the heated zone completely.

3. Chain Conveyors

Chain conveyors are typically employed in heavy load applications. Chain conveyors can be designed as a rolling or sliding chain configuration. Chain type selection is highly dependent on temperature, connection type, material selection and lubrication.
There are hundreds of chain styles, many designed specifically for a single industry or application. Attachment-style chains allow for attachment of customized part fixtures.

Advantages of chain conveyors include:

Ease of maintenance and replacement
Durability
Many available styles
Customizeable

Chain conveyors are a good choice for heavy loads and specialty part sizes.

4. Roller Conveyors

Depending on processing temperature, roller conveyors will often be designed with shaft bearings mounted on the outside of the oven/furnace to protect power transmission components (chain, bearings, motors). Roller conveyors are used in heavy loading applications, and offer flexibility in motion, and accumulation of product. Products are often loaded on a pallet or frame when roller conveyors are utilized.