Method of controlling hardening with laser beam and laser beam hardening device

摘要

In hardening with laser beam by irradiating laser beam 29 on a workpiece 27, oscillating the laser beam so as to heat a workpiece with a hardening width W1, laser beam output in both end portions (times (1), (5), (6), (10) of Fig.4, for instance) of amplitude of the laser beam is made lower than one of a center portion (times (3), (4), (7), (8) of Fig.4, for instance) of the amplitude. Relative moving velocity of the laser beam with respect to workpiece is decreased, and the quantity of giving energy of the laser beam in both end portions of the amplitude where the density of giving energy of laser beam is high is decreased so as to equalize quantity of aiming energy in the whole hardening cycle. By doing so, a proper hardening action is possible.