Quenching medium: Hardening oil or polymer-water emulsion
In the case of mandrels, an additional difference can be made between a fixed mandrel, i.e. a cylinder precisely ground to the outside diameter, which can also be designed with teeth if required. The expanding mandrel, on the other hand, uses several segments that, using an expanding cone that moves on a block, move the coordinated segments to a defined diameter and hold them in this position with hydraulic pressure during the shrinking of the component.
