In which areas can induction heating technology be applied

In which areas can induction heating technology be applied

Principle of induction heating

  The so-called induction heating power supply is a device that uses the principle of electromagnetic induction to generate high-frequency induction eddy current heating effects to heat the workpiece. It is essentially a frequency converter with a power control function. The heating power supply converts the 50Hz power frequency power supply into a high frequency power supply of 10kHz or higher. The high frequency current passes through the coil to generate an alternating magnetic field. When the magnetic field lines in the magnetic field pass through the metal workpiece to be heated, the alternating magnetic field lines penetrate the metal workpiece A loop is formed, so eddy currents are generated in its cross-section, so that the workpiece to be heated locally generates heat rapidly, thereby achieving the purpose of industrial heating.

 Induction heating technology started in 1831, the inventor Faraday. In the second half of the 19th century, induction heating technology began to be used in actual production---conductor heating. The initial application area is metal melting. With the development of metal melting applications, surface hardening of steel parts began to appear in 1927. Mainly heat treatment of crankshaft and cylinder barrel. The solid-state high-frequency power supply was applied in 1967. Now it has developed from a low-frequency device to a high-frequency device, and the efficiency is constantly improving. Schematic diagram of induction heating

The most important effect in induction heating

  Due to the skin effect, the induced current distribution in the workpiece is uneven, which causes uneven heat generation in each part of the workpiece. A large amount of electric energy close to the surface is converted into heat energy. The internal current is small, the heat generation is small, and the internal temperature rises. It mainly depends on the external surface energy to enter in the way of conduction. Therefore, if the induction heating power is very large and the heating time is short, the conduction method will not be transmitted to the inside of the workpiece. There are strict surface heating requirements in welding and other processes, and the heating time is very long. Short, sometimes the surface temperature of the workpiece is very high, it has burned red, or even melted, but the inside is still low.

 
Industries and products involved in induction heating

  The induction heating power supply has the characteristics of cleanliness, energy saving and easy realization of automation. The innovation and development of induction heating technology meets my country's requirements for industrial transformation and upgrading, and is consistent with the goal of establishing a low-carbon, green and energy-saving society. In 2011, the induction heating power supply was selected into the "Recommended Catalogue of Energy-saving Electromechanical Equipment (Products)" issued by the Ministry of Industry and Information Technology; China Heat Association also formulated a work plan for the promotion and demonstration of advanced clean production technologies in the heat treatment industry, and carried out the "Key Energy-saving Technology Promotion Project" and "Clean Production" Advanced technology demonstration project", induction heating technology and its products are also listed.

  Annealing: air-conditioning copper tube online annealing system Electric furnace: continuous galvanizing furnace tunnel furnace walking beam furnace ring top charging melting furnace round aluminum melting furnace tilting holding furnace vacuum arc remelting furnace electric slag remelting furnace vacuum induction melting furnace vacuum precision casting furnace Induction Condensed Shell Melting Furnace Vacuum Brazing Furnace Vacuum Heat Treatment Furnace Vacuum Degassing Furnace Quenching: Quenching Machine Tool

Heat treatment: gear heat treatment

Shaft heat treatment preheating: heating with steel slab injection molding machine

Hot assembly: hot assembly machine

Welding: induction brazing equipment

Forging: Forging and solidification of metals such as copper and aluminum

Bonding: car door and cover

Plasma: Use high-frequency equipment to generate plasma. Optical fiber, ceramics, nano-material applications.

After heat: improve cable insulation

Straightening and leveling: deck straightening and leveling locomotive head

Tempering: Tempering of auto parts