Vacuum electromagnetic annealing furnace

This equipment is mainly used for annealing high-grade electromagnetic wires or cables (copper-based or aluminum-based). High-grade electromagnetic wires or cables are generally used in wind power equipment, transformer industries, military special industries, etc.

Components

It consists of heating furnace, material heating system atmosphere circulation system, vacuum system, internal circulating gas cooling device, secondary water cooling system, safety guarantee alarm system, computer PLC control system, material inlet outlet system, furnace front trolley, hydraulic system, etc.

Parameters (it can also be customized according to customer requirements)

Rated temperature: 650 ° C

Rated voltage: 380V

Rated load: 16000Kg

Design heating power: 520KW

Effective size of charging furnace: ∮2400 5200mm

Heating furnace body size: ∮2400 3400mm

Cooling capacity: Guaranteed heat treatment cooling time ≤8h for full load 16 tons

Full load heating time: ≤2h (room temperature -360 ℃)

Full load cooling time: ≤8h (360 ℃ -50 ℃)

Working pressure: ﹢1000 Pa≤P≤ ﹢ 3000 Pa

Hydraulic push rod stroke: 1000mm

Hot air circulation fan power: 18KW

Cooling circulating fan power: 18KW

Temperature control accuracy: ≤ ± 1 ℃

Furnace temperature uniformity: ≤ ± 10 ℃

Cooling water entering temperature: ≤15 ℃

Cooling water outlet temperature: ≤50 ℃

Number of loading trays: 32 trays Size: diameter thickness = ∮630 475mm

Number of loading trays: 10 trays Size: diameter  thickness = ∮1000 710mm

Furnace design pressure: 0.02MPa

Cooling water consumption: 30 tons / h

Water pressure: 0.3Mpa

Working principle

The wire reel is horizontally placed on the tooling rack, which is placed on a moving cart in front of the furnace. The hydraulic push rod pushes the material rack into the furnace. Under the action of the hydraulic system, the furnace door automatically closes. The system completes a series of actions such as vacuuming, filling with protective gas, safety detection before the heating device starts. When the process operating environment requirements are met, the heating is automatically started and completed according to pre-set process parameters. During the entire process, the computer PLC control system automatically adjust the furnace pressure, oxygen content, temperature uniformity, furnace gas circulation speed, heating speed other processes to complete the process. After heating, the heating system is automatically turned off. Start the cooling system air-cooled circulation system. According to the cooling process requirements, the frequency conversion control is used to achieve the optimal convective heat exchange rate of the gas. When the cooling rate decreases, the control system will automatically start the secondary water-cooling system to effectively ensure the cooling effect of the air-cooled device. When the temperature drops to the process temperature, the automatic alarm will remind the furnace, the furnace door will be opened by the hydraulic system, the hydraulic system will pull the work piece out of the furnace. Proceed to the next workflow.

Advantages

Compared with traditional equipment, this equipment has the following advantages:

1. The heating chamber is connected to the working room through pipes. In this way, the heating element the workpieces are placed in the same heating temperature environment. The protective atmosphere is used as the medium. The workpieces are directly heated by convection. The heating speed is fast, the effective thermal efficiency of the furnace is as high as 55% or higher; But in the traditional furnace the heating element is heated outside the tank, the thermal efficiency is low.

2. The use of high-temperature circulating fans for forced convection stirring to increase the thermal movement of gas molecules improve the efficiency of gas heat transfer. Therefore, the working pressure is only 0.003MPa, the low pressure greatly reduces potential safety hazards. because of its low temperature low pressure, the production subsequent maintenance costs of the tank are greatly reduced, the cooling time is greatly shortened, which saves costs improves production efficiency.

3. Place the heating elements, the protect atmosphere, the copper parts in the same environment, stir vigorously under the action of the variable frequency speed control fan. The furnace temperature uniformity is ensured ≤ ± 5 ℃, the quality of the annealed parts is uniform, the performance is excellent.

4. No need to heat the tank directly circulate convective heat transfer, high thermal efficiency, which reduce material labor costs, high production efficiency

5. The cooling speed is faster more evenly.

Adopting the circulation cooling method, the protective atmosphere is directly cooled by a special cooler then sent to the furnace to take away the heat from the copper parts. The cooling time is ≤ 6 hours, which saves more than 14 hours compared with the traditional furnace type.

6. The work piece is fully controlled from entering the furnace body to being discharged from the furnace after cooling. It does not require high-temperature operation, takes up a small area, has a very comfortable working environment.

7. The control system is advanced, the entire system works automatically. The system has a complete set of monitoring, protection, alarm devices for safe operation to ensure that the equipment is safe, reliable, operating normally. You only need to set the parameters, all the processes are carried out automatically, just as simple as rice cookers.

8.The intelligent control system avoids errors in various processes caused by human factors, guarantees that the rebound angle of copper parts returned for processing is ≤2.8 °, the elongation is ≥45%, the performance is reliable.

9. The equipment is easy to use easy to learn. Because it adopts PLC program control, the process parameters are set by touch screen, which is easy to learn.

10. Due to the use of low-pressure, without  protected atmosphere tank heating, there is no need to add expensive protective tanks in the future, which saves a lot of maintenance costs for equipment use.