First, what is electromagnetic induction heating?

1. Electromagnetic induction heating; electromagnetic induction heating is the alternating current generated by the induction heating power source to generate an alternating magnetic field through the inductor (ie, the coil), and the magnetic conductive object is placed therein to cut the alternating magnetic field lines, thereby generating alternating current inside the object. Current (ie, eddy current), eddy current causes the atoms inside the object to move at high speed and irregularly, and the atoms collide with each other and friction to generate heat energy, thereby heating the object. That is, a heating method in which electric energy is converted into magnetic energy to cause the heated steel body to induce magnetic energy and generate heat. In this way, it fundamentally solves the problem of low efficiency of heating by means of heat conduction such as electric heating sheets and electric heating coils.

  Simply put, the principle of electromagnetic induction heating is to use the conversion between electricity, magnetism and heat to achieve the effect of heating the heated object itself . The essence of electromagnetic induction heating equipment is to use electromagnetic induction to generate eddy current in the cylinder to heat the electric heating workpiece. It converts electric energy into electromagnetic energy, and then converts electromagnetic energy into electric energy. The electric energy is converted into heat energy inside the metal to achieve heating. The purpose of the metal , thus eliminating the hazard and interference of the open flame in the heating process, is an environmentally friendly, nationally-recognized heating scheme.

Electromagnetic induction heating diagram   1

Electromagnetic induction heating apparatus of the multi-station metal rod induction heating field   Figure II

Second, the induction heating equipment terminology explained:

1 , an induction wire coil is also called Sensor

It is made of coils made of copper wire .

2 , inner hole sensor

An inductor for heating the hollow inner surface .

3 , induction coil magnet

According to the technical requirements, the position of the plane or other shaped workpiece is required to be heated , which is used to change the magnetic field distribution to meet the heating requirements or to reduce the heating of the adjacent objects of the sensor.

4 , adjustable turn ratio quenching transformer

A high-frequency transformer made to adapt to the inductance of various hardened workpieces and inductors .

5 , induction hardening machine

A mechanical device for clamping workpieces and enabling the position of the quenched workpiece to move up and down or rotate according to process requirements .

Third , induction heating equipment features :    

DSZP series induction heating equipment physical map Figure III

>IGBT inverter technology and series resonant circuit; > Lock-in technology and soft-open technology ensure high reliability and automatic frequency tracking; > Power factor is not less than 0.95 ;>100% load continuation rate design, continuous operation, can be turned on immediately or power down; > protection circuit function > environmental protection, clean, pollution-free, to improve the working environment of workers; > low energy conversion efficiency as high as 97.5% or more, compared with SCR saving induction heating equipment 10% - 30% ; > It replaces traditional heating methods such as oxygen flame, coke oven, salt bath furnace, gas furnace, oil furnace, etc. > > Power output is stable , heating speed is faster, and power saving effect is more obvious.               
      
                               
      
      
      
             
      
      

> Zero-voltage sweep software is started, which is more suitable for frequent start-up requirements ;

> Protection measures are comprehensive, such as over-current, over-pressure, water temperature , water pressure , and lack of equal protection, so that the equipment is reliable in operation and simple in operation, and is suitable for various heating processes.

Four , electromagnetic induction heating equipment section can Features and Benefits

Induction heating speed, high production efficiency, saving material and forging cost . Since the principle of induction heating is electromagnetic induction, the heat is generated in the workpiece itself , that is to say, the internal heating method is adopted, that is, the metal tube inside the barrel is heated by the electromagnetic induction, and the average preheating time is shortened by the heating method of the resistance ring 2/ 3 , at the same time the thermal efficiency is up to 95% , and the power saving effect can reach 30%-70% . 

After the ordinary workers go to work, they use the induction heating equipment to heat the parts. The forging task can be carried out continuously in ten minutes. The professional workers do not need to burn the furnace and seal the furnace in advance. There is no need to worry about the waste of the heated billet of the coal stove due to power outage or equipment failure. Due to the rapid heating rate of the heating method, the oxidation is extremely small, and the forgings have a good finish. Each ton of forgings and the coal burning furnace can save at least 20-50 kg of steel raw materials , and the material utilization rate can reach 95% . Since the heating method is uniform in heating and the temperature difference of the core watch 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 50 um . Compared with the coal stove, the induction heating equipment has a superior working environment, improves the working environment of the workers and the company image, and has no pollution. The low-energy induction induction furnace is no longer subject to the roasting and smoking of the coal stove under the scorching sun. Meet the requirements of various indicators of the environmental protection department, and at the same time establish the company's external image and the future development trend of the forging industry. IGBT induction heating furnace is electrically saving and environmental protection of heating one , heated from room temperature to 1100 is deg.] C forgings , per ton of consumed with consumption of less than 360 degrees . 

5. Application fields of induction heating equipment :

1 , welding : cutting, drilling, cutting tools, woodworking tools, turning tools, drill bits, brazing, reamer, milling cutter, drill, serrated blade, eyeglass frames industry, steel, copper solder, pick Welding, welding of the same kind of metal, compressor, pressure gauge, relay contact point, composite welding of different materials of stainless steel pot bottom, welding of copper wire of transformer winding, storage ( welding of gas nozzle, stainless steel meal, welding of kitchen utensils ) .

Tool induction welding site Figure 4

2 , heat treatment : gears, machine tool guides, hardware tools, pneumatic tools, power tools, hydraulic parts, ductile iron, automobile and motorcycle parts , internal parts and other mechanical metal parts ( surface, internal bore, local, integral ) quenching, annealing, stainless steel The pot product is stretched.

        Henan Desheng DSGP-160 induction heating equipment quenches the gears

3 , through thermoforming : standard parts, fasteners, large workpieces, small hardware, straight shank twist drill, hot or hot rolling of whole or partial diathermy and twist drill, round steel withdiameter less than 100mm , metal material Heating annealing for stretching, molding, embossing, bending, boring, steel wire ( wire ) heating nailing, stainless steel product annealing, stretching, rising, thermal expansion, and the like.V

Medium frequency induction heating equipment for automotive half shaft through-heating forging

4 , other heating fields : aluminum plastic pipe, steel plastic pipe, cable, wire heating film, metal preheating plastic sleeve, semiconductor single crystal growth, heat matching, bottle mouth heat sealing, toothpaste skin heat sealing, powder coating, Metal-implanted aluminum foil seals used in the plastics, food, beverage, and pharmaceutical industries.

Induction heating equipment for the interference assembly of the gear Figure