Induction heating furnace for quenching and tempering

1. Heating principle of induction heating furnace for quenching and tempering:

The induction heating method is to transfer electric energy to the heated metal workpiece through the induction coil, and then the electric energy is converted into heat energy inside the metal workpiece. The induction coil and the metal workpiece are not in direct contact, and the energy is transferred through electromagnetic induction. Therefore, we take this This heating method is called induction heating.

The main principles of induction heating furnaces for quenching and tempering are: electromagnetic induction, skin effect, and heat conduction. In order to heat the metal workpiece to a certain temperature, the induced current in the workpiece is required to be as large as possible. Increasing the current in the induction coil can increase the alternating magnetic flux in the metal workpiece, thereby increasing the induced current in the workpiece. Another effective way to increase the induced current in the workpiece is to increase the frequency of the current in the induction coil. Because the higher the frequency in the workpiece, the faster the change in magnetic flux, the greater the induced potential, and the greater the induced current in the workpiece. . For the same heating effect, the higher the frequency, the smaller the current in the induction coil, which can reduce the power loss in the coil and improve the electrical efficiency of the device.

During the heating process of the induction heating furnace for quenching and tempering, the temperature of each point inside the metal workpiece is constantly changing. The greater the induction heating power, the shorter the heating time, and the higher the surface temperature of the metal workpiece. The lower the temperature. If the induction heating time is long, the temperature of the surface and center of the metal workpiece tends to be uniform through heat conduction.

2. Development of induction heating furnaces for quenching and tempering

The induction heating furnace for quenching and tempering can complete the mechatronics equipment through the perfect combination of machine, electricity, and liquid, which can greatly improve the connotation quality and accuracy of the equipment, the program operation is reliable, the positioning is accurate, and the appearance of the equipment is more beautiful. The operation is safer and faster. The induction heating quenching and tempering equipment is a better process to ensure the heat treatment of metal workpieces such as steel bars, steel pipes, and rods.

3. Features of induction heating furnace for quenching and tempering:

1. Induction heating furnace for quenching and tempering ‍The heating time is short, and the heating efficiency is high. The efficiency of the induction heating furnace can reach 70%, especially the induction melting furnace can reach 75%, which greatly shortens the production cycle and improves labor. condition.

2. The induction heating furnace for quenching and tempering has less heat loss and the workshop temperature is greatly reduced, so the working conditions of the workshop are improved. The induction heating furnace does not produce smoke and smoke, and it purifies the working environment of the workshop, which is in line with environmental protection. Require.

3. The induction heating furnace for quenching and tempering has high efficiency and short heating time. It saves more materials than flame heating furnaces. At the same time, it increases the service life of forging dies. The burnout rate of oxide scale produced by the blank is 0.5%-1%.

4. The induction heating furnace used for quenching and tempering improves the level of production organization and product quality. It is equipped with corresponding three sorting devices for turning, feeding and discharging, which has a high degree of automation, reduces labor and improves work efficiency.

5. The induction heating furnace for quenching and tempering adopts integrated equipment and has a small area.

4. Selection of induction heating furnace for quenching and tempering:

The selection of induction heating furnace for quenching and tempering is determined according to the process requirements and size of the workpiece to be heated. According to the material, size, heating area, heating depth, heating temperature, heating time, productivity and other process requirements of the heated workpiece, comprehensive calculation and analysis are carried out to determine the power, frequency and induction coil technical parameters of the induction heating equipment.

5. Composition of induction heating furnace for quenching and tempering:

The production line for round steel and steel bar quenching and tempering produced by Haishan electric furnace selects high-performance and cost-effective solutions according to the process requirements proposed by the customer. The complete production line includes intermediate frequency heating equipment, mechanical conveying device, infrared temperature measurement device, and closed type. Water cooling system, center console, etc.

1. Intermediate frequency power supply

The complete control system of the intermediate frequency power supply is produced by imported foreign technology, and adopts the constant back pressure time inverter control method for automatic frequency tracking and adjustment. The equipment has reasonable wiring and strict assembly technology, and has the advantages of complete protection system, high power factor, convenient operation and maintenance, and high reliability.

2. Pressure roller feeder

It is mainly composed of variable frequency motor, high-strength press roller, roller components, etc. The supporting roller adopts a double-seat supporting steel roller structure. The steel roller and the inner sleeve are filled with high-temperature insulation materials, and the inner sleeve is connected with the shaft key. Not only is it easy to disassemble, but it can also prevent surface burns caused by contact with the steel roller during the transfer of the workpiece.

3. Sensor

It is mainly composed of multiple sets of sensors, connecting copper bars, water dividers (water inlet), closed return pipes, channel steel underframes, quick-change water joints, etc.

4. Switching of the sensor (quick change)

a. Switching of groups of sensors: overall hoisting, sliding-in positioning installation, quick-change joints for water, and high-strength stainless steel large bolts for electricity connection.

b. Quick-change of single-section sensor: One quick-change joint for water inlet and outlet, and two large bolts for electricity connection.

c. Sensor copper tube: All are national standard T2 copper.