How to choose the right frequency of induction heating power supply

First of all, to understand the heating process requirements of the product, there are roughly the following situations:

1) Heat penetration of the workpiece, such as: fasteners, standard parts, auto parts, hardware tools, rigging, hot upsetting and hot rolling of twist drills, etc. The larger the diameter of the workpiece, the lower the frequency should be. like:

Below Φ4 mm, suitable for high frequency and ultra-high frequency (200-500KHz);

Φ4-16 mm for high frequency (30-100 KHz);

Φ16-40 mm for super audio (10-30 KHz);

Above Φ40 mm, suitable for intermediate frequency (1-10 KHz);

The 250KW intermediate frequency heating power supply can diathermy metals such as bars and round bars with a diameter of less than 100mm.

2) Quenching heat treatment, such as shafts, gears, quenching and annealing of stainless steel products, etc. Taking quenching as an example, the shallower the quenching layer of the workpiece, the higher the frequency, and the deeper the quenching layer, the lower the frequency. like:

The quenching layer is 02.-0.8mm, suitable for 100-250 KHz ultra-high frequency and high frequency.

1.0-1.5mm for 40-50 KHz high frequency;

1.5-2.0mm for 20-25 KHz super audio;

2.0-3.0mm for 8-20 KHz super audio and intermediate frequency;

3.0-5.0mm for 4-8 KHz intermediate frequency;

5.0-8.0mm for 2.5-4 KHz intermediate frequency.

3) Brazing, such as drill bits, turning tools, reamers, milling cutters, drill bits, etc. and composite welding of different materials at the bottom of stainless steel pots, the larger the welding volume, the lower the frequency. Taking turning tool welding as an example,

Such as: tools below 20 mm, suitable for 50-100 KHz high frequency;

Tools above 20-30mm are suitable for 10-50 KHz high frequency and super audio frequency;

For tools above 30 mm, it is suitable for 1-8 KHz intermediate frequency.

4) Smelting gold, silver, copper, lead and other precious metals

It depends on the furnace and production efficiency. Small capacity can choose high frequency, most of them choose super audio frequency and medium frequency super audio frequency, which can meet the general application of die-casting industry, and can melt 200KG aluminum ingots per hour.