Fuji Denshi has developed a unique method of hardening to defy the common belief that "Induction hardened cams are liable to crack at hardening or during the grinding process".
"Our eccentric motion" hardening is an innovative development that ensures a uniform hardened layer and internal stress.
Both of these are required for roller cams, which have been adopted recently.
With this method, the compressive residual stress on the surface layer is uniformly transformed on all the around of cam.
Therefore, crack does not occur during grinding process. And high-speed grinding can be done on the treated cam shaft.