3. Cutting materials

In view of their particular geometry, the precision required and the conditions of use, hobbing tools are made from high-speed steels. Often working at high temperatures due to the complex formation of machining chips, they retain their properties, in particular their hardness at 63-67 HRc.

Unlike other tools, carbides are rarely used in these techniques. Attempts have been made, but have often ended in failure, mainly due to discontinuous working, and above all to the thermal shocks that occur when machining steels. On the other hand, cast-iron gear hobbing stations have been successfully equipped.

The choice of high-speed steel grades depends...