| 摘要 |
PURPOSE:To form a wide quenched layer and prevent cracks from being produced by irradiating a tool tip with high energy density beam while vibrating the beam at a high speed and relatively moving a cutting tool material in the direction intersecting the direction of the beam vibration while melting the top surface layer of the irradiated portion. CONSTITUTION:Laser beam 12 while being moved at a high speed repeatedly in the direction P is irradiated on the surface of a high speed steel 1. At the same time, either one or both of the high speed steel 1 and the beam 12 is moved at a low speed in the direction Q. This produces an effect as if a rectangular beam of a length corresponding to the high speed movement width of the beam 12 is irradiated by any required length. As a result, a quench-solidified layer 3 of a wide width is formed by melting the high speed steel surface of an area corresponding to the high speed movement width of the beam 12. Since the repeated movement of the beam 12 is at the high speed in this way, the portion irradiated with the overlapped beam receives essentially the same effect with that of a simultaneous irradiation or the same effect of quenching of a single quench-solidification and, as a result, cracks are prevented from being produced.
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