The photo shows the hardening station of an automobile power train CVJ
(constant velocity joint) outer surface induction hardening
and reheating machine.

The outer stem and cup grooves are hardened at one station
using the same converter.

Reheating is done at a separate station with a separate converter.

※At Fuji Denshi, we refer to tempering as reheating to differentiate
from furnace methods.

The process on this machine is
　・loading
　　　↓
　・stem heating
　　　↓
　・stem quenching, cup heating
　　　↓
　・cup quenching
　　　↓
　・reheating
　　　↓
　・after quenching
　　　↓
　・unloading

By combining the hardening stations while keeping the reheating
station separate, we achieved a remarkably short cycle time of
under 30 seconds per workpiece while maintaining high quality.