Introduction of medium frequency induction heating equipment

The intermediate frequency induction heating equipment uses the principle of electromagnetic induction to generate eddy currents in the workpiece placed in the induction coil, so that the workpiece is heated to the required temperature. The equipment adopts series resonance or parallel resonance, so the power factor is higher. Compared with traditional heating methods, it has the advantages of high efficiency and low pollution. The equipment has a wide range of applications in forging and metal heat treatment industries.

  working principle

The working principle of the intermediate frequency induction heating equipment is to place a metal cylinder in the induction coil with alternating intermediate frequency current. The metal cylinder is not in direct contact with the induction coil. The temperature of the energized coil itself is very low, but the surface of the cylinder is heated To redness or even melting, and the speed of this redness and melting can be achieved by adjusting the frequency and the strength of the current.

IF advantage

With the rapid development of my country's industrialization process, the field of induction heating has also developed rapidly. Due to environmental protection requirements and coal price increases, heating with coking coal not only does not meet environmental protection requirements, but also is very uneconomical in terms of price and economy. On the other hand, At present, industrial heating still uses a large number of KGBS intermediate frequency heating equipment with thyristor as the main device. Low power factor consumes a lot of electric energy. With the extension of the financial crisis, energy saving, consumption reduction and cost reduction have become very urgent issues for small and medium-sized enterprises. . So we used nearly 20 years of induction heating experience, successfully developed the JZ (IGBT) series of energy-saving intermediate frequency.

  Features

1. The production operation is simple, the feeding and discharging are flexible, and the degree of automation is high, which can realize on-line production.

2. The workpiece heating speed is fast, the oxidation decarburization is less, the efficiency is high, and the forging quality is good.

3. The heating length, speed and temperature of the workpiece can be precisely controlled.

4. The workpiece is heated evenly, the temperature difference between the core and the surface is small, and the control precision is high.

5. The sensor can be carefully made according to customer requirements.

6. All-round energy-saving optimization design, low energy consumption, high efficiency, and lower production cost than coal-fired production.

7. In line with environmental protection requirements, the pollution is small, and the labor intensity of workers is also reduced.

  Product advantages

1. Saving features

●Fast heating speed, high production efficiency, less oxidative decarbonization, saving material and forging die cost. Since the principle of medium frequency induction heating is electromagnetic induction, its heat is generated in the workpiece itself, and ordinary workers can use the medium frequency electric furnace to go to work within ten minutes. The continuous work of the forging task does not require professional furnace workers to burn and seal the furnace in advance. There is no need to worry about the waste of heated billets due to power outages or equipment failures. Due to the fast heating rate of this heating method, there is very little oxidation. Compared with coal-fired furnaces, each ton of forgings saves at least 20-50 kilograms of steel raw materials, and its material utilization rate can reach 95%. Because the heating method heats evenly and the temperature difference between the core surface is extremely small, the life of the forging die is greatly increased in forging, and the surface roughness of the forging is also less than 50um.

2. Environmental protection features

●Superior working environment, improve workers' labor environment and company image, no pollution, low energy consumption Compared with coal stoves, workers will no longer be roasted and smoked by coal stoves under the scorching sun, and can meet the requirements of various environmental protection departments. To meet the requirements of this index, and at the same time establish the company's external image and the future development trend of the forging industry. Induction heating is the most energy-saving heating method in the electric heating furnace. The power consumption of a ton of forgings heated from room temperature to 1100 ℃ is less than 360 degrees.

3. Precise features

●The heating is uniform, the temperature difference between the core surface is extremely small, and the temperature control accuracy is high. The heat of induction heating is generated in the workpiece itself, so the heating is uniform, and the temperature difference between the core surface is extremely small. The application of temperature control system can realize precise control of temperature and improve product quality and qualification rate.

4. Other features

The intermediate frequency furnace heating device has the advantages of small size, light weight, high efficiency, excellent thermal processing quality and favorable environment. Coal-fired furnaces, gas furnaces, oil-fired furnaces and ordinary resistance furnaces are rapidly being eliminated. The intermediate frequency furnace is the main equipment of the casting forging and heat treatment workshop. The stability, reliability and safety of its work are the guarantee for the normal and stable operation of the casting, forging and heat treatment production line in the flow operation. The intermediate frequency furnace has a good development prospect in the field of thermal processing, such as the main production of forging pre-forging heating furnace, diathermy furnace and induction heating for: diathermy, rolling, forging, pipe bending, heat treatment (quenching), welding and other processes .

Safe operation

1. There are two types of intermediate frequency induction heating frequency conversion equipment, generator type and thyristor type. The maximum voltage of the intermediate frequency current can reach about 750V, and the safe electricity rules must be observed when using it (the power of the inverter is generally greater than 100kW). The IF computer room should be well ventilated and kept clean, tidy and dry. IF equipment must have more than two people to start the operation, and designate the person in charge of the operation. Operators should be familiar with and abide by the operating procedures of the IF equipment, and wear the prescribed protective equipment. The workpiece should be removed from burrs, iron filings and grease, otherwise it is easy to cause arcing, and the workpiece should also be prevented from contacting the sensor to cause arcing during operation. When using intermediate frequency quenching machine tools, attention should be paid to the safe operation rules of electrical, mechanical and hydraulic transmission. The equipment needs to be repaired by a special person. Before repairing, discharge the capacitors with a discharge rod. It is strictly forbidden to carry out emergency repairs with electricity.

2. Power frequency induction heating equipment uses industrial electric frequency, low voltage and high current to heat and quench or normalize large workpieces. When using it, the rules for safe electricity use should be observed.

3. In order to prevent the large workpiece from bursting and hurting people during power frequency induction heating, the operation rules of power frequency heat treatment and the corresponding heat treatment process rules for large workpieces must be strictly followed. Large workpieces should be ultrasonically inspected one by one. For workpieces with defects such as white spots, serious segregation and looseness, it is forbidden to use power frequency equipment to heat them. The workpiece should be free of burrs, iron filings and oil to prevent arcing. In the production operation, the person in charge must be designated, and the operator must be familiar with and abide by the operating procedures of the power frequency equipment.

  Basic parameters

1. Square steel (pipe)

Blank material: 45# 40Cr

Blank size: 20×20——150×150

Blank temperature: 1100℃—1200℃

Heating power: 100KW—1000KW

Working frequency: 200Hz—8000Hz

2. Round bar

Blank material: 45# 40Cr, etc.

Blank size: Φ20—Φ200

Blank temperature: 1100℃—1200℃

Heating power: 100KW—2000KW

Working frequency: 200Hz—8000Hz

3. Imitation

Blank material: 45# 40Cr, etc.

Billet form: special-shaped parts such as rails, forks, rigging, etc.

Blank temperature: 900℃—1150℃

Heating power: 100KW—800KW

Working frequency: 500Hz—8000Hz

4. Special sensor for leaf spring heating

Billet material: 60Si2Mn 50MnV

Blank form: 50×8 63×10 75×16

Heating length: 100-500

Heating temperature: 850℃—950℃

Sensor method: oval flat sensor, opening sensor

Working frequency: 10KHz—30KHz