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　　 Medium-frequency furnace A medium-frequency power supply is generated by a rectifier-inverter using thyristors and then transmitted to the furnace coil. A medium-frequency electromagnetic field is created between the furnace (coil) and the metal inside the furnace, inducing eddy currents in the metal. These eddy currents generate intense heat within the metal, ultimately melting it.

　　The medium-frequency furnace mainly consists of a power supply, an induction coil, and a crucible made of refractory material housed within the induction coil. The crucible contains a metal charge that functions as the secondary winding of a transformer. When the induction coil is connected to an AC power source, an alternating magnetic field is generated within the induction coil. As a result, the metal charge in the crucible is subjected to induced electromotive force, forming a closed circuit within the charge itself. Consequently, when the charge material is simultaneously exposed to induced currents, these currents flow through the charge material, heating it and promoting its melting.

　　The medium-frequency furnace is also an induction furnace. First, an inverter power supply rectifies three-phase AC (using thyristors) into single-phase DC. Then, this DC is inverted back into a medium-frequency pulsed AC ranging from 500 to 1,000 Hz via an inverter bridge. The copper coil inside the furnace generates a magnetic field, which induces eddy currents in the steel material within the inner coil. Thus, the medium-frequency induction furnace typically operates at frequencies between 800 and 20,000 Hz.

　　 Medium-frequency furnace Characteristics:

　　1. Superior working environment, improved worker conditions and company image, zero pollution, low energy consumption.

　　Compared to coal-fired furnaces, induction heating furnaces eliminate the need for workers to endure the scorching heat and smoke from coal furnaces under the blazing sun. Moreover, induction heating meets all the environmental protection standards set by regulatory authorities, helping to enhance the company’s external image and align with future trends in the forging industry. Induction heating is an energy-efficient heating method among electric heating furnaces; to heat a ton of forgings from room temperature to 1,100°C, the electricity consumption is less than 360 kilowatt-hours.

　　2. The medium-frequency furnace provides uniform heating with minimal temperature difference between the core and the surface, and boasts high temperature-control accuracy.

　　Induction heating generates heat internally within the workpiece itself, ensuring uniform heating and minimizing temperature differences between the core and surface. By using a temperature-control system, precise temperature regulation can be achieved, thereby improving product quality and increasing the pass rate.

　　3. Characteristics of the medium-frequency furnace

　　A melting speed, energy-saving effect, reduced combustion, and lower energy consumption.

　　B features self-mixing functionality, uniform melt temperature, and homogeneous metal composition.

　　C electric heating has a good working environment.

　　D has excellent startup performance; with the furnace empty, the entire blast furnace can achieve a 100% startup rate.

　　4. Other characteristics of the medium-frequency furnace

　　The medium-frequency heating device is a new-generation metal heating equipment that features small size, light weight, high efficiency, excellent thermal processing quality, and significant environmental benefits—quickly replacing coal furnaces, gas furnaces, fuel-fired furnaces, and conventional resistance furnaces.

　　 Medium-frequency furnace It is the primary equipment of casting, forging, and heat-treatment plants. Its stable operation, reliability, and safety ensure the normal and steady functioning of continuous casting, forging, and heat-treatment production lines. The medium-frequency furnace has excellent development prospects in various thermal processing fields, including main production processes, pre-forging heating furnaces, double-hearth furnaces, rolling, forging, pipe bending, heat treatment (quenching), and welding—where induction heating plays a key role.