When rated power of is not enough, how to inductively heat oversized workpiece?

When the rated power of the equipment is not enough, how to inductively heat the oversized workpiece?

When the rated power of the equipment is not enough, the following methods can be used for induction heating of oversized workpieces:

1) Improve the efficiency of the sensor. For example, the diameter of the roller is large and the power of the medium frequency power supply is not enough. Later, silicon steel magnet was inserted into the roller inductor, which improved the inductor efficiency and solved the problem. Originally, it was generally considered that the effect of the outer circle inductor and the guide magnet was small. In fact, after the outer circle inductor was added with a magnetic conductor, the magnetic line of force was reduced and concentrated in the heating area, so the efficiency could be greatly improved.

2) The workpiece is preheated in the resistance furnace before induction quenching. Before induction hardening of final drive gears in a tractor factory in Romania, the gears were preheated to 400 ℃ by resistance furnace, and then induction hardening was carried out. A company in the United States also adopted a similar process.

3) Preheat 1-2 times with induction heating, and then conduct induction quenching. For example: using vacuum tube 60kW power supply, scanning quenching of about 100 mm shaft parts, shaft parts after 1-2 times of preheating, scanning quenching, solved the heat treatment problem of machine repair parts. This process is also used in the scanning quenching of cylinder liner bore. When the cylinder liner rises, it is scanned and preheated, and then it is scanned and quenched when the cylinder liner is lowered.