The vacuum annealing furnace is primarily used for stainless steel products under a controlled protective atmosphere. It is suitable for continuous bright annealing, solution treatment, demagnetization, and quenching of stainless steel items such as:
- Stainless steel deep-drawn parts (plumbing fittings, water-expanded parts)
- Pins, medical instruments, nails, screws, and rivets
- Stainless steel bearings, watch cases, watch bands, knives
- Miniature shafts, self-tapping and self-drilling screws, cutlery
This versatile furnace allows precise processing under protective gases to maintain surface quality and structural integrity.
Structure of the Vacuum Annealing Furnace:
- Frame: The frame is welded from various steel profiles. The outer frame uses channel steel as main beams, with thin cold plates for cladding. For car-type annealing furnaces, channel steel is used for the main beams, and medium-thickness plates are used for the bottom and front/rear panels.
- Drive System:
- Carriage drive: An electric motor and reducer drive the front active wheel via a chain.
- Furnace door: Driven by a combination of worm gear reducer and electric motor for electric lifting.
- Sealing:
- Carriage-furnace sealing uses a labyrinth structure with automatic sand-sealing knives on both sides of the carriage.
- Furnace door sealing employs rolling-track compression and spring-loaded automatic mechanisms.
- Furnace body is constructed with high-quality refractory bricks for chamber tightness. Carriage high-pressure parts use high-alumina bricks, with insulation bricks underneath for heat retention.
- Combustion System: Multiple burners are installed on both sides of the oil furnace. Heat flow circulates inside the furnace to ensure temperature uniformity. Both fully automatic and semi-automatic options are available.
- Flue Gas Preheating Device: Located at the top rear of the furnace. Flue gas passes through a preheater where a fan sends it with cold air for preheating. The heated gas is then directed to the burners to assist combustion. A manually operated butterfly valve at the outlet allows furnace pressure adjustment.
Applications:
Vacuum annealing furnaces are widely used in industries such as chemical, petroleum, food, metallurgy, machinery, light industry, power, shipbuilding, paper, mining, pharmaceuticals, and centralized heating for processes including heating, cooling, condensation, and evaporation.