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It is used for spheroidizing annealing of bearing rings and spheroidizing annealing of bearing steel pipes. It mainly utilizes the specificity of the spheroidizing annealing process of bearings and the characteristics of heat upward movement. How much heat is required to heat up, and how much heat needs to be released for cooling, and the released heat is also used. The upper layer is fed and the lower layer is discharged, and more than 90% of the heat that needs to be released during annealing is reasonably recovered to the product for heating, and the heating uniformity of the product is improved.

And feed in and out at the same end. It is convenient for workers to load and unload materials, reduce the running of operators at both ends, and reduce the labor intensity of workers; a high-temperature lifting table is used for workpiece transfer. It can lock the furnace temperature, reduce heat loss, and at the same time save the amount of protective atmosphere, breaking the traditional straight-through furnace type with two openings.

The characteristics of the spheroidizing annealing furnace are as follows:

1. The heating method of all electricity or electricity + gas is adopted, the continuous operation mode, the whole process of heat treatment is automated, and the process can be traced back.

2. The furnace lining is made of high-quality fiber structure, which can significantly improve the thermal efficiency, high efficiency and energy saving, and reduce costs.

3. Scientific and reasonable C-shaped structure of the furnace body. The discharged workpiece is heat exchanged between the lower layer and the upper layer on the feeding and discharging table, and the upper layer workpiece is preheated to improve the heating  uniformity and energy saving effect of the workpiece. The heat preservation and insulation layer is used in the furnace, which is divided into upper and lower independent furnaces. Independent temperature control improves the precision and accuracy of temperature control.

4. The feeding and discharging of the workpiece are in the same position as the design, which is designed as a ladder, which is convenient for operation. The air lock chamber and the feeding and discharging table are equipped with a waste heat drying chamber to dry the workpiece to reduce water vapor entering the furnace, reduce the decarbonization and oxidation of the workpiece, and achieve the effect of energy saving at the same time.

5. The heating element adopts the radiant tube heating method made of high-quality stainless steel, which is more convenient and fast to maintain. The control adopts regulator + temperature control instrument to improve the temperature control accuracy and uniformity in the furnace.

6. Nitrogen is used as the basic protective gas + enriched gas, and the annealed workpiece has no oxide scale.

7. The furnace body of the spheroidized annealing furnace adopts the method of welding, and there is an air lock chamber before entering and leaving the furnace. The furnace body has better sealing performance and achieves the purpose of more energy saving.

8. The main electrical components of the automatic control system are made of high-quality products and imported products.

9. Each area is controlled by dual dual table + regulator, which can better ensure the process temperature and product quality. At the same time, the thermocouple is equipped with calibration holes to ensure the temperature control accuracy requirements of the thermocouple.

10. The furnace body is equipped with a heating stirring fan to make the temperature and atmosphere in the furnace more uniform and ensure the unity of the workpiece after heat treatment.

11. Touch screen monitoring system, real-time monitoring of the working screen; station display; fault display, causes and inspection and elimination methods, fault, alarm records, process, temperature history curve and data records; in and out time records, historical temperature changes can be accessed at any time; Archive after downloading.

Mainly used for steel pipes with high requirements on product quality and surface quality. It is realized by DX, RX atmosphere or nitrogen + enriched gas as a protective atmosphere. Our company mainly uses nitrogen + enriched gas as a protective atmosphere. Customers can customize according to their own needs, and can make oxygen-free furnaces, bright furnaces, positive annealing oxygen-free furnaces, and positive annealing oxygen-free bright furnaces.

Soften the metal before further cold working or manufacturing processes, and further reduce and improve the overall metallographic microstructure of the pipe. In the process of precision rolling or cold drawing, the pipe will become hard and brittle. In order to further cold drawing or cold rolling the pipe, it is necessary to remove the stress formed during the cold working process to restore the material to its normal state. During the annealing process, the tube is heated to a controlled temperature and held for a period of time. Through this process, the grains in the microstructure of the steel pipe are re formed into a regular stress free state, allowing for further processing and manufacturing of the pipe.

The stepping heating furnace can adopt the heating method of natural gas open flame, which is to transfer the blank to the furnace step by step by the action of rising, advancing, descending and retreating of the furnace bottom and metal beam.

Advantages:

1. The furnace top is made of a full-fiber movable furnace top cover, and the flue gas pipes are distributed on both sides, which is convenient for hoisting and fast maintenance. The two sides of the full-fiber movable furnace top are fixed and not easy to fall off, and are durable. They can be repaired in the next day after emergency repair.

2. Moist stone bricks and fibers are used in the furnace, which has less heat absorption and light specific gravity for heat storage.

3. The walking furnace moving bed is a preheated air-cooled moving bed, which is durable and easy to maintain.

4. The hydraulic cylinder system of the stepping furnace has been optimized to save fuel; the action is fast and stable, and the patent certificate has been obtained.

5. The frame structure is adopted. According to customer requirements, micro-foundation and no foundation can be realized, which can be dug a little deeper or placed directly on the ground, which reduces the cost of customers digging deep foundations.

6. The automatic centering device for feeding of the stepping furnace is automatically centering during use, without manual adjustment of the position, which is convenient for workers to operate, but the length of the material should be larger than the width of the moving bed.

Common furnace type

QB-40, QB-50, QB-60, QB-76, QB-90, QB-100