Application of medium frequency induction heating furnace

(1). Used for diathermy and temperature compensation of bar materials, round steel, square steel, and steel plates;

(2). Online heating and local heating of quenched steel material;

(3). Online forging of metal materials (such as precision forging of gears, half-shafts, connecting rods, bearings, etc.);

(4). Heating before extrusion, hot rolling, shearing, spraying heating, and hot assembly;

(5). Overall quenching and tempering, annealing, tempering, etc. of metal materials.

Composition of induction heating furnace

The composition of medium frequency induction heating furnace includes power supply, induction furnace body, PLC system, and water cooling equipment.

According to customer requirements, it is equipment with automatic feeding device, automatic discharging device, infrared temperature control, and PLC automatic control.

Principle of heat treatment furnace

The working principle of the medium-frequency induction heating furnace is based on electromagnetic induction heating technology. When alternating current passes through the induction coils, an alternating magnetic field is generated around it. When this alternating magnetic field acts on the metal workpiece placed inside, eddy currents are generated within the metal. As the eddy currents flow inside the metal, they generate a large amount of heat due to the metal's own resistance, thereby heating the metal. The frequency range of the current used in medium-frequency induction heating makes electromagnetic induction heating more efficient and the heating more uniform.

Features of induction heating furnace

(1). Fast heating speed and minimal oxidation and decarburization. Due to the principle of medium frequency induction heating, which relies on electromagnetic induction, heat is generated internally within the workpiece itself. Therefore, this heating method features fast temperature rise, minimal oxidation, high heating efficiency, and good process repeatability.

(2). With uniform heating and high temperature control accuracy, induction heating easily meets the requirements of uniform heating and small temperature difference between the core and the surface. The application of temperature control system enables precise temperature control.

(3). Compared with other heating methods, low-energy consumption and pollution-free induction heating boasts high heating efficiency, low energy consumption, and zero pollution; all indicators can meet user requirements. Under diathermic conditions, the power consumption from room temperature to 1200℃ is less than 360kw.h/t.

Key parameters of one success case of induction heating furnace

Items	Technical requirements	Remark
Key parameters
Heating temperature	900℃-1100℃
Production rhythm	60 seconds per piece
Equipment startup rate	100%
Power supply
Power supply type	IGBT
Rated power	250KW
Power factor at rated power	≥95%	(No need for power factor compensation device)
Rated output frequency	1-2kHz
Induction furnace body
Induction heating furnace coils type (furnace chamber)	Lying type
Medium frequency induction heating furnace	Heating Φ80mm-Φ100 billets	three-hole position
Main machine rack	Carbon steel
The running speed of the bar material in the induction furnace body	0mm/s-100mm/s (Adjustable speed)
Actual power of heating bar material	Adjustable within the rated power range
Production efficiency adjustment method	Automatic adjustment (power-time curve)
Operation method	Manual/semi-automatic/automatic control program
Temperature measurement method	Infrared temperature measurement
Cooling method	Water cooling
PLC control system
Automated control system	PLC control system
PLC	Siemens S7 series
Touch screen	＞10 inches
Power control system	The most advanced digital control system currently available enables precise power control and remote maintenance. By replacing the control board, power instability can be avoided	.
Temperature control system	Temperature closed-loop system, PID control system
Power regulation range	5-100%
Cable, signal wire	High temperature resistant cable
Electronic control cabinet, operation cabinet	IP65	Thickened board, ergonomic
Protective device	Overvoltage, overcurrent, overload, input undervoltage, etc
Instrument accuracy	Level 0.5
Temperature control and recording method	Continuously online
Temperature outside the induction coils	＜50℃
Furnace shell and rack temperature	＜40℃
Water cooling equipment
Cooling water flow rate	20T/h
Work pressure	0.2Mp-0.4Mp
Cooling capacity	Inlet water temperature: 45℃; Outlet water temperature: 35℃
Cooling tower function	Water temperature monitoring and alarming; water level monitoring and automatic water replenishment; automatic start of standby pump in case of main pump failure; automatic adjustment of water temperature.

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