Induction Hardening

Induction Hardening is a method to increase the hardness and resistance of the surface of workpieces to increase durability, wear, scratch and dent resistance, This is critical for items such as hydraulic cylinder rods and linear bearing bars.

Technology - Induction hardening

Induction Hardening reduces the wear of the workpiece. One very efficient method of hardening the surface of steel bars is using the induction hardening process.


High frequency alternating current induction coils generate eddy currents and bring heat to the surface of the workpiece. The type of induction coils used is adapted to the required depth of hardness, the diameter and the hardening speed. The workpiece heated to 900° C is transported uniformly rotating through the system at a constant speed.


The thickness of the heated layer is in the range of about 1 mm to 3 mm. Immediately after heating, the workpiece is quenched with an emulsion or water. Automatically controlled showers inject cooling media onto the workpiece. The resulting steam is removed by means of a suction unit mounted on top of the machine.


An additional tempering / annealing induction coil is used to adjust the stress in the material.


Applications

Continuous centerless induction hardening is used to harden the surface of hydraulic bars and cylinders, ball screws and other round components.

Materials

Metallic, cylindrical workpieces with diameters of 10-200 mm.

Characteristics

The LOESER technology used in continuous induction hardening produces a uniform hardness depth over the entire workpiece surface. At the same time the risk of thermal distortion ( bending ) is minimized by the spiral hardening of the workpiece. Computer controlled rotational and translational movement of the workpieces, combined with precise process control, deliver accurate and reproducible results at a high volume production rate. 
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