Features of Medium-Frequency Through-Heating Furnaces: Rapid heating, high production efficiency, minimal oxidation and decarburization, and savings on material and forging die costs.
Based on the principle of electromagnetic induction, heat is generated internally within the workpiece. Workers can begin continuous forging operations just ten minutes after starting up the furnace, eliminating the need for specialized personnel to pre-heat or seal the furnace. There is no risk of wasting pre-heated billets-a common issue with coal furnaces during power outages or equipment failures. The rapid heating rate minimizes oxidation; compared to coal furnaces, this method saves at least 20–50 kg of steel raw material per ton of forgings, achieving a material utilization rate of up to 95%. Uniform heating results in a negligible temperature difference between the core and the surface, significantly extending forging die life and ensuring a surface roughness of less than 50 μm for the forgings.
Superior working environment, improved conditions for workers, enhanced corporate image, zero pollution, and low energy consumption.
Unlike coal furnaces, induction furnaces spare workers from the scorching heat and smoke associated with coal-fired units. They meet environmental regulatory standards while projecting a positive corporate image aligned with the future of the forging industry. Induction heating is the most energy-efficient electric heating method, consuming less than 360 kWh of electricity to heat one ton of forgings from room temperature to 1,100°C.
Uniform heating, minimal core-to-surface temperature difference, and high temperature control precision.
Because heat is generated internally within the workpiece, heating is uniform with a negligible temperature difference between the core and the surface. Integrated temperature control systems allow for precise regulation, improving product quality and the pass rate.
With advantages such as compact size, light weight, high efficiency, superior thermal processing quality, and environmental friendliness, medium-frequency electric furnaces are rapidly replacing coal, gas, oil, and standard resistance furnaces, representing the new generation of metal heating equipment.
Medium-frequency electric furnaces are essential equipment in casting, forging, and heat treatment workshops; their operational stability, reliability, and safety ensure the smooth and consistent functioning of continuous production lines. Well-known domestic brands of medium-frequency electric furnaces include Hebei Hengyuan Electric Furnace Manufacturing Co., Ltd. and Shandong Jinhuaxin Electromechanical Equipment Co., Ltd.
In recent years, several domestic enterprises have conducted research and developed ultra-high-frequency induction machines capable of oscillation frequencies up to 1.5 MHz. These machines produce smaller weld points, making them ideal for precision components such as eyeglass frames and ultra-fine wires. A prime example of such a manufacturer is the Dongguan Guangyuan Variable-Frequency Electronic Equipment Factory.
Medium-frequency induction heating furnaces are widely used in processes such as welding, annealing, quenching, and through-heating. Their applications span industries including automotive and motorcycle parts, railway rails, aerospace, weaponry, machinery manufacturing, electrical appliance manufacturing, and specialty metal processing. Specific uses include through-heating prior to hot die forging; surface and localized quenching and annealing of workpieces; brazing of motors, electrical components, and valves; sintering of tungsten, molybdenum, and copper-tungsten alloys; and the melting of metals such as gold and silver.