HFC (high-frequency currents – hardening and heat treatment)
HFC hardening by Technolit Int.
Metal parts that are subject to friction, torsion, bending, etc. must possess high hardness, but they must have this property only on the surface, as the excess hardness inside the part is undesirable. Parts are exposed to the surface hardening to achieve these metal properties; only the surface layer is hardened to a certain temperature with the quick subsequent cooling, and the core of the part retains its initial properties.
The surface layer of a metal part can be effectively heated by high-frequency currents (HFC). This procedure gives the metal the high mechanical friction and abrasion resistance; therefore, the HFC surface hardening is one of the most effective methods, which meets the modern mass production requirements and gives the metal different hardening degrees through heat treatment.
During the HFC hardening process a metal part is placed in the electromagnetic field inside a copper tube bended to the shape of the part and the alternating high frequency currents are induced. The currents are pushed out to the part surface by the magnetic current induced inside. Since the induced currents have an extremely high density on the part surface which is being heated, the surface layer is heated quickly.
The HFC (high-frequency currents) induction hardening is characterized by two parameters: by the depth and hardness of the part layer being treated. Induction heaters (HFC apparatus) with the capacity ranging from 40 kVА to 160 kVA with the frequency of 20-40 kHz or 40-70 kHz are used to get thin layer in the hardened item. If deeper layers are required, the range of frequencies from 6 to 20 kHz is used.
There are also other methods of hardening, but the surface hardening of metals by using high-frequency currents has the following advantages:
The HFC hardening has proved to be very effective. This is a cost-saving and high-productive way of metal heat treatment that provides a part with high strength and durability.
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