Induction coil of induction heating furnace

As the load of the induction heating furnace, a rectangular copper tube is wound into a spiral shape according to a certain number of turns, and an induction magnetic field is generated through an alternating current to achieve the purpose of heating the metal. The induction coil of the induction heating furnace has a great influence on the heating effect, so let’s talk about the induction coil of this induction heating furnace.

A. Induction heating furnace induction coil heating follows the following electromagnetic induction effects:

1. The ring effect.

2. Skin effect.

3. Sharp corner effect.

4. Proximity effect.

B. The function of the induction coil of the induction heating furnace is to transmit the induction current, and then achieve the purpose of heating the workpiece. The induction coil is an important part of the intermediate frequency heating sensor. The design and manufacture of the induction coil have a great influence on the heating of the induction heating furnace.

C. The diameter of the induction coil of the induction heating furnace is determined according to the diameter of the workpiece. According to the ring effect, the closer the diameter of the induction coil is to the diameter of the workpiece, the better. The diameter of the induction coil is generally 30-40mm larger than the diameter of the workpiece. Generally speaking, thick and short workpieces have smaller thermal distortion and smaller gaps, while thin and long workpieces have larger thermal distortions and larger gaps.

D. The length of the induction coil of the induction heating furnace, if it is before forging, the length of the heating coil is generally 3-4 times the length of the workpiece; if it is quenched, the height of the induction coil should be 15% shorter than the workpiece for one-time integral heating (the workpiece does not move) ; There is no strict requirement for the height of the induction coil of successive heating furnaces, generally about 20mm. In order to prevent cracking caused by the sharp corner effect of the end face, there should be a certain gap.

E. The cooling water of the induction coil of the induction heating furnace is generally designed and determined according to 45% of the heating power. The parameter refers to the heat conversion of 1kw·h=860kcal to calculate the cooling water demand; the induction coil of the heating furnace is quenched, and the diameter of the workpiece should be ensured. , The shape of the quenching area and the passage of the cooling water, and the general water sprayer and the induction coil cooling groove should ensure that there is a sufficient amount of cooling water.

The induction coil of the induction heating furnace is a relatively complex component, and certain professional knowledge is required to ensure that a reasonable induction coil is designed to achieve the required heating purpose.

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