The hardening progress of thread rolling dies is done by TECHNO vaccum & oil quenching furnace in the heat treatment dep. (TOYOGAN iNDUSTRY). The tempering progresses are different setting according to die hardness requirement. After checking the hardness of die materials by hardness testers, the die materials are ready for thread grinding progress.
The thread rolling dies are checked by both the projector and the profile projector to ensure the precision.