Maschinenfabrik ALFING KESSLER GmbH

Using inductors to heat the bearing journals of a crankshaft

Induction hardening

The heating process and the subsequent quenching is an energetic procedure performed in a matter of seconds. A secure hardening process is decisive in terms of the bending strength, torsion strength and wear resistance of the crankshafts, which are among the engine parts subject to the most intense loads.

In the early 1950s, ALFING developed induction hardening machines for in-house crankshaft production. This led to the production of the first hardening machine for customers in 1952. Our hardening machines became recognised as the best in the world due to such factors as the modular machine structure, the latest converter technology, in-house inductor construction and intelligent procedures such as tempering using residual heat.

Optimum interplay between the inductors and the converters ensures that heat-up times are as short as possible.

The quantity and temperature of the coolants dictate the quality of the quenching process. Therefore, the cooling media are subject to permanent monitoring.

Tempering using residual heat, which is performed to reduce tension in the work piece, is one of our special areas of expertise. It reduces energy and investment costs by eliminating the need for a separate tempering furnace.