| 摘要 |
PURPOSE:To shorten the time required for piercing, and also, to lower roughness of the working surface at the time of cutting, and to improve the working quality, in laser beam machining for executing piercing and cutting. CONSTITUTION:In the laser beam machine constituted of a laser oscillator for generating a laser light, a working table for moving an object to be worked, and a numerical controller for controlling its working table, a driving device is provided so as to move in the axial direction of a torch in the torch provided in an outlet of the laser light, in addition to a fixed lens 4. One piece or plural pieces of movable lenses 18 are provided, and as piercing advances, a focal position is moved to the inside of the object to be worked, and at the time of switching to cutting, a focus is moved to a position determined by a cutting condition, and also, a focal position movement which follows an optical axis movement in the course of cutting is corrected by controlling a position of the movable lens. |
