1. Purpose It is used for bright annealing of the copper rod. The maximum working temperature of the furnace is 650ºC. 2. Design Requirement Throughput: 5000kg/h
Maximum Working Temperature : 650ºC Working Temperature : 600ºC Diameter of Copper Rod: 8mm Diameter Copper Coil: ≤1800mm Weight per Coil: 5000kg Roller Conveyor Transmission Speed: 1m/min (Low Speed), 6m/min (High Speed ) Temperature Control Deviation: ≤±5ºC Grain Size After Annealing: 0.01-0.045mm Quality of Annealing Treatment: The copper rod is free of scratch, oxidation and dirt in the surface, it will be bright and maintain its metal nature. The final copper oxide in the copper rod must not be changed from the inlet in the furnace to the exit. Protective Gas: Nitrogen Thermal Efficiency : Above 50% Skin Temperature: ≤ ambient +30ºC Workpieces Exit Furnace Temperature: ≤60ºC Heating Method: Natural gas, indirectly heating (Gas Radiant Tube)
4. Working Process Requirements 4.1. Use It is used for bright annealing of copper rod. 4.2. Product Quality after Treatment Quality of Annealing Treatment: The copper rod is free of scratch, oxidation and dirt in the surface, it will be bright and maintain its metal nature. The final copper oxide in the copper rod must not be changed from the inlet in the furnace to the exit. 4.3. Specification of Workpieces Outer Diameter of Copper Rod: 8mm Outer Diameter of Copper Coil: ≤1800mm Height of Copper Coil: ≤1000 mm Weight of Coil: ≤5000Kg/Coil 5. Description of Working Process
Workpieces and trays are transferred onto loading table by over-head crane, ready to enter into the furnace for annealing.
Front door of vacuum chamber opens, workpieces with the trays are conveyed into the vacuum chamber through conveyor. After the workpieces are conveyed to the right place, front door will be closed for vacuuming and filling nitrogen (twice) and prepare for heating.
Rear door of vacuum chamber opens, meanwhile, front door of heating chamber shall open, and workpieces with the trays shall be conveyed into the heating chamber for heating under protective atmosphere. The workpieces move forward/backward to ensure a uniform heating.
After heating is finished, rear door of heating chamber shall open, and workpieces with the trays shall be conveyed to cooling chamber for cooling. Heat generated by workpieces is exhausted out by circulating fan and heat exchanger. When convectively cooling, workpieces remain in a stillness state.
Front door of vacuum water-cooling chamber shall open, and the trays with the workpieces shall be conveyed into vacuum water-cooling chamber by the roller conveyor. The rollers and trays with the workpieces shall be dropping into the water for cooling.
Rear door of vacuum water-cooling chamber shall be open after the cooled workpieces are being lifted up, and the trays with the workpieces shall be conveyed to unloading table by the roller conveyor, then operator shall pick off trays and workpieces with the over-head crane.
Rear door of vacuum water-cooling chamber shall close, and perform vacuuming and filling nitrogen (twice), then waiting for next cycle.
The above process will be performed one by one, and repeated in a cycle. The furnace can be applicable to the mass production of workpieces with the same working process; for those which have the different processes, the former process time should be shorten than the latter process time. If the latter process is shorter than the former one, the empty trays shall be used to make up time difference of process.
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