The mesh belt annealing muffle furnace is a continuous heat treatment equipment. Its core feature is the use of a metal muffle tube to create an independent and atmosphere-controlled space, coupled with a heat-resistant steel mesh belt to continuously transport workpieces, enabling bright annealing, solution treatment, or brazing of metal parts under a protective atmosphere.
The following is a detailed technical analysis of this equipment:
1. Structure and Core Components
This equipment typically consists of the following core units, forming a complete production line:
Muffle Tank (Core Component): Usually welded from high-quality heat-resistant steel plates such as SUS310S (0Cr25Ni20Si2), it is arched or tunnel-shaped. Its function is to isolate the furnace chamber from the workpieces, ensuring that the protective atmosphere does not leak out, while also improving the uniformity and airtightness of the furnace temperature.
Mesh Belt Drive System: The mesh belt is woven from a special high-temperature alloy (such as imported Japanese heat-resistant steel wire) and driven by a continuously variable speed motor. The operating speed can be adjusted according to process requirements (e.g., 0.05-0.5 M/min) to ensure the workpiece passes smoothly through the furnace chamber.
Heating and Insulation System: The furnace chamber uses resistance wire or imported heating elements, arranged in zones. The furnace lining is mostly made of all-fiber structure or high-alumina bricks, providing good insulation performance and temperature control accuracy up to ±1.5℃.
Atmosphere Control System: Typically equipped with an ammonia decomposition furnace or nitrogen generator, nitrogen (N₂), hydrogen (H₂), or argon (Ar) is introduced into the muffle furnace as a protective gas to prevent workpiece oxidation and achieve brightening.
Cooling System: After heating, the workpiece enters a water-cooled jacket or gas-cooled chamber for rapid cooling under a protective atmosphere (e.g., water-cooled jacket heat transfer) to obtain the desired metallographic structure.
2. Working Principle: The workpiece enters the muffle furnace through the feed inlet and, surrounded by a protective atmosphere, moves along the conveyor belt sequentially through the preheating zone, heating zone, insulation zone, and cooling zone.
Key Process: During the heating process, the protective gas isolates the workpiece from outside air, preventing workpiece oxidation.
Rapid Cooling: For austenitic stainless steel (such as the 300 series), rapid cooling (at a rate of 55℃/s or higher) is required after heating to approximately 1050℃ to prevent carbide precipitation, resulting in a bright, scale-free product with uniform properties.
3. Main Application Areas
This equipment, due to its continuous production and high-quality processing capabilities, is widely used in the following fields:
Metal Heat Treatment: Quenching of martensitic stainless steel for small mechanical parts, hardware tools, and medical devices; solution treatment of austenitic stainless steel.
Non-ferrous Metal Processing: Continuous bright annealing of copper tubes, aluminum tubes, and steel tubes under controlled atmosphere.
Others: Powder metallurgy sintering, glass annealing, electronic ceramic substrate firing, and brazing of cemented carbide tools.
4. Technical Parameter Reference:
Parameter Item | Typical Parameter Value
Maximum Temperature | 1050℃ - 1150℃
Common Temperature | 970℃ - 1000℃
Belt Width | 150mm - 800mm (Customizable)
Heating Zone Length | 1800mm - 4400mm (Multi-temperature Zones)
Protective Atmosphere | N₂, H₂, Ar, or Ammonia Decomposition Gas
Total Power | 12kW - 90kW (Depending on Size Specifications)
5. Equipment Advantages
Good Surface Quality: Processed under a protective atmosphere, resulting in bright, oxide-free parts.
Minimal Deformation: Continuous transmission and uniform heating reduce workpiece deformation.
High Production Efficiency: Continuous, uninterrupted production is possible, suitable for processing large batches of parts.
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