Principle and working progress of induction melting furnace

Principle and working progress of induction melting furnace

Oct 15, 2014-China-The principle of induction heater should be the high voltage electrical source from a primary coil induces a low voltage, high current in the metal, or secondary coil. Induction heating is simply a method of transferring heat energy.

Induction furnaces are ideal for melting and alloying a wide variety of metals with minimum melt losses, however, little refining of the metal is possible. There are two main types of induction furnace: coreless and channel.

The heart of the coreless induction furnace from www.dw-inductionheating.com is the coil, which consists of a hollow section of heavy duty, high conductivity copper tubing which is wound into a helical coil. Coil shape is contained within a steel shell and magnetic shielding is used to prevent heating of the supporting shell. To protect it from overheating, the coil is water-cooled, the water re-circulating and cooled in a cooling tower. The shell is supported on trunnions on which the furnace tiles to facilitate pouring.

The crucible is formed by ramming a granular refractory between the coil and a hollow internal former which is melted away with the first heat leaving a sintered lining.

The power cubmicle converts the voltage and frequency of main supply, or that required for electrical melting. Frequencies used in induction melting vary from 50 cycles per second (mains frequency) to 10,000 cycles per second (high frequency). The higher the operating frequency, the greater the maximum amount of power that can be applied to a furnace of given capacity and the lower the amount of turbulence induced.

When the charge material is molten, the interaction of the magnetic field and the electrical currents flowing in the induction coil produce a stirring action within the molten metal. This stirring action forces the molten metal to rise upwards in the centre causing the characteristic meniscus on the surface of the metal. The degree of stirring action is influenced by the power and frequency applied as well as the size and shape of the coil and the density and viscosity of the molten metal. The stirring action within the bath is important as it helps with mixing of alloys and melting of turnings as well as homo-genising of temperature throughout the furnace. Excessive stirring can increase gas pick up, lining wear and oxidation of alloys.

The coreless induction furnace has largely replaced the crucible furnace, especially for melting of high melting point alloys. The coreless Induction hardening is commonly used to melt all grades of steels and irons as well as many non-ferrous alloys. The furnace is ideal for remelting and alloying because of the high degree of control over temperature and chemistry while the induction current provides good circulation of the melt.

About dw-inductionheating.com

The induction heater and heating system from dw-inductionheating.com are widely used in induction brazing, welding, forging, induction melting, hardening induction, PWHT process and many other fields.

Contact:
Tel: +86-131-55965571
Address: No.16, Xinle Road, 1st Industrial District, Jiangbei Village, Wusha Area, Chang An Town, Dongguan City, Guangdong Province, China (Chien WAH Co., Ltd)
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E-mail: inductionheating@gpgyjr.com.cn, admin@gpgyjr.com