| 摘要 |
PURPOSE:To work a deep U-part, to avoid surface flaws and to perform high speed scanning of a laser beam by making incident laser beams irradiating along a bent line on an area out of the optical axis of a condenser lens. CONSTITUTION:The workpiece 1 is bent by irradiating a laser beams 3 along the bent line 11. In this case, the beam 3 irradiates the bent line 11 so that it is inclined to the optical axis 61 on the lens 6 to condense the beam 3 on the workpiece 1 and the lens 6 is moved in parallel with the bent line 11. By this method, though the optical axis 61 is included in the surface of the bent work piece 1, that is, though the workpiece 1 is bent as far as 90 deg., the irradiating area of the beam 3 is made symmetrical to the bent line 11. Consequently, occurrence of burning and thermal strain, inferior shape by thermal imbalance, etc., can be reduced. |
