Q&A
When product variety is low, sizes are similar, and 24/7 high-volume production is required (such as automotive standard fasteners and hardware parts), a Continuous Furnace offers the lowest overall energy consumption and labor costs. If products are highly diversified and require frequent changes in process temperatures and cycle times, a Batch Furnace provides superior flexibility.
●Vacuum Furnace: Heating is conducted in an oxygen-free state, preventing workpiece surface oxidation and decarburization. Parts exit the furnace bright and clean as new with minimal deformation, making it ideal for aerospace parts, high-end mold steels, and titanium alloys. The downside is the high equipment cost.
●Atmosphere Furnace: Protective gas (such as nitrogen) or active gas (such as carburizing gas) is introduced, offering a relatively lower equipment cost. It is suitable for carbon steel or general alloy steel requiring surface chemical heat treatments (like carburizing or nitriding).
A Pit Furnace utilizes vertical loading. Besides significantly reducing high-temperature bending and deformation of long shaft workpieces, its deep, cylindrical chamber is highly favorable for gas flow. Therefore, it is frequently designed as a precision-controlled atmosphere carburizing or nitriding furnace, capable of achieving highly uniform case depth.
A Bell Furnace features a movable "bell" cover that seals over the workpieces and inner cover. It provides excellent airtightness and controllable cooling rates. It is most commonly used for the"Bright Annealing" of steel coils, copper coils, and stainless steel wire rods, ensuring uniformannealing throughout the entire coil and preventing surface oxidation.
A Salt Bath Furnace uses molten salt as the heating medium, achieving extremely fast heating rates (about 4 to 5 times faster than air furnaces) while ensuring absolutely uniform heating of workpieces with zero oxidation or decarburization issues. For cutting tools and high-speed steel drill bits that feature extremely complex shapes and are highly prone to deformation, the salt bath furnace still delivers irreplaceable low-deformation results and high quality.
Heat transfer relies primarily on radiation and convection. In low-temperature ranges (below approximately 600°C, such as during tempering or aluminum alloy processing), thermal radiation is highly inefficient, and high-power fans must be used for forced convection heat transfer to ensure furnace temperature uniformity. In high-temperature ranges (above 850°C),thermal radiation becomes the dominant mechanism, and the fan's role shifts to blending the atmosphere.
The "Internal Chamber Dimensions" refer to the physical length, width, and height of the equipment's interior. Conversely, the "Working Zone" refers to the actual usable space that has been verified through a Temperature Uniformity Survey (TUS) to stably maintain temperatures within the allowable tolerance range (such as ±5°C). Workpieces must be placed within the working zone to guarantee qualified heat treatment quality.