| 摘要 |
The invention provides a laser hardening method capable of preventing adjacent already-hardened layers from being annealed. In the laser hardening method of the present invention, conduits C 1 , C 2 and C 3 are processed in advance midway between pitches P 1 along which a hardening nozzle 190 performs overlap hardening. After moving the nozzle 190 along a center line L 3 to process a hardening layer H 23 , the nozzle 190 is moved in parallel for a single pitch P 1 to perform hardening of a hardening layer H 24 . Thermal energy E 1 of the laser beam LB is also irradiated toward the direction of the hardening layer H 23 , but it is blocked by the conduit C 3 that prevents the laser beam from annealing the hardening layer H 23 . |
