| 摘要 |
PURPOSE:To prevent the formation of a softened layer by tempering and to form a uniform quenched layer, at the time of quenching the outer peripheral surface of a tubulous or a columnar material by using laser beam. CONSTITUTION:The laser beam 2 is emitted from a CO2 laser beam oscillator 1 and irradiates the tubulous or the columnar material 3 through a concave cylindrical mirror 5 and a flat integration mirror 6. As the irradiating shape of the laser beam 2, a diameter in the rotating direction of the tubulous or the columnar material 3 is made to be larger than a diameter in the longitudinal direction. By this method, the quenched layer is formed on the wide area in the surface of the tubulous or the columnar material 3. |
