| 摘要 |
PURPOSE:To provide a titled device which hardens uniformly and satisfactorily a metallic surface by the constitution in which a laser beam is irradiated to a polyhedral reflecting mirror consisting of the specular faces provided respectively at different distances from the center of a rotating body to said body and the metallic surface is hardened by the beam reflected therefrom. CONSTITUTION:The specular faces 1a1-4, 1b1-4 of the polyhedral reflecting mirror made into the prism or pyramidal shape constituting the rotating body 1 are provided at equidistantly varied differences in the distances r1-4 from the axial line of the body 1. The corresponding faces 1a1-4 and faces 1b1-4 are respectively axis-symmetrically provided. The body 1 of the above-mentioned constitution is rotated at a high speed by a motor 2 and the laser beam from a laser oscillating head (not shown) is condensed by a lens 3 and is irradiated to the polyhedral reflecting mirror. The work W moving at a specified speed in an arrow direction is heated and hardened by the reflected beam thereof at a scanning focal line 4. The lines 4a1-4, 4b1-4 formed by the faces 1a1-4, 1b1-4 are formed to the prescribed widths corresponding to the moving speed of the work W and the uniform and deep hardening is made possible without generating the molten state. |
