Conduction hardening
With conductive hardening or conduction hardening, the workpiece to be hardened or the hardening zone is traversed by a high-frequency current and heated to hardening temperature.
A safe current transfer between the contact and the workpiece is required for power supply. At a low frequency of the current, contacting is problematic, especially with large currents and high temperatures. At high frequency, experience has shown that only small contact areas and a low contact pressure are required for contacting. In hardening plants hydraulic or pneumatic pressure systems are used for contacting.
The conductive hardening comes e.g. B. for racks for use. The HF current is fed to the rack through a water-cooled copper pipe (conductor) so that the HF current flows through the toothing to be hardened. Due to the close coupling of the conductor to the surface of the workpiece, the HF current flows more precisely along the surface.
The conductive process is rarely used; workpieces are hardened inductively ( induction hardening ) much more frequently .
literature
- Walter Eversheim, Günther Schuh: Production and Management 3 . Design of production systems, Springer Verlag, Berlin 1999, ISBN 3-540-65453-4 .