Fuji Denshi has developed a spiral multi-turn coil using 3D modeling to heat treat the cup portion of ball joints. This system results in an ideal hardening pattern which precisely follows the geometry of the work piece. Moreover, Fuji Denshi avoids cracking and melting while preserving shock resistance by matching suitable concentrators.
Fuji Denshi is able to both harness and improve the mechanical properties of ball grooves, roller grooves and cross-groove universal joint grooves to their fullest.