| 摘要 |
PURPOSE:To increase the effective absorption factor of laser beams and to carry out efficient heat treatment by converging laser beams reflected from the surface of steel on the part of the steel to be heat treated by multipath reflection from a cavity. CONSTITUTION:Laser beams 2 are applied to the surface of steel 1 to modify the surface properties by heating or melting. At this time, the part of the steel to be heat treated is covered with a hemispherical cavity 4 having a laser beam introducing hole 5 on the optical axis of the laser beams 2. The laser beams 2 are applied to the part to be heat treated through the hole 5, and energy reflected and radiated from the part is converged on the part by multipath reflection from the inside of the cavity 4. |
