This is the simplest method which, however, cannot always be carried out because of the increased heat-treatment volumes. For instance, even fine threads or fittings up to H7 can be made before hardening. However, it is recommended that tests be carried out beforehand, because they can be reproduced with very high scores!
Complete machining after tempering
This is the most frequently carried out method. Here the machinist has to pay attention to the material involved. Machining is mostly easier for the types ADI 800-8 and ADI 1000-5 than for such as EN-GJS-600-3, as the ADI does not have such a high amount of hardness scattering and can thus be more uniformly machined. Ceramic cutting tools should be used for high-alloy and harder types.
Pre-Machining before tempering, followed by final machining
This method is mainly used for high-alloy material qualities, because it is more economical to apply two stages of machining, as materials standing times are thus reduced.
ADI extremely hard and tough
material is capable of absorbing a high level of energy
heatable at very high degree
high mechanical and thermal tool resistance
relatively high tool wear
ADI hochfest und zäh
the material ADI can be machined!
tool form and machining parameters must be suitably adjusted!
ADI requires stronger cutting tool materials in comparison with spheroidal graphite iron
the optimal cutting speed for turning ADI is below 200 m/min!