Patent EP-2343147-A1 (EP)
Inventor: HELD JUERGEN
IPC: B23K26/08
Filed: 2010-12-08
Abstract: The laser processing device for large dimensional component, comprises a laser beam source and a processing head, which is guidably arranged by a longitudinal traverse (6) that lies a rectangular coordination system over the component along a processing line. An optical element (8) is arranged in the beam gear between the laser beam source and the processing head and forms the laser beam (2) so that the beam radius has a size conveying for processing on the focusing element. The optical element is a part of two telescopes. The laser processing device for large dimensional component, comprises a laser beam source and a processing head, which is guidably arranged by a longitudinal traverse (6) that lies a rectangular coordination system over the component along a processing line. An optical element (8) is arranged in the beam gear between the laser beam source and the processing head and forms the laser beam (2) so that the beam radius has a size conveying for processing on the focusing element. The optical element is a part of two telescopes, which are arranged so that the first telescope enlarges the laser beam radius and the second telescope reduces the laser beam radius. The first optical element is focusing element that forms the laser beam on the outlet side with a beam waist (9) that corresponds to the beam waist of the laser beam before the focusing element, or the first optical element is a part of a system from optical elements having two optical elements. The interval between the two optical elements is greater than the geometrical optical interval so that the beam waist appears in the laser beam in the beam direction towards the last optical element, where the radius of the laser beam is smaller than the beam radius at last optical element. The geometrical optical interval is defined as the interval of the optical element, when whose focal points lie to each other. Both telescopes are arranged so that the laser beam radius after the second telescope is similar to the laser beam radius before the first telescope. The telescopes are arranged so that the laser beam radius after the second telescope is transformed on a radius required for the processing head. The optical elements are arranged to the optical elements focusing the laser beam that forms the laser beam emerging from the optical element on the discharge side with the beam waist, which corresponds to the beam waist of the laser beam on the inlet side of the optical element. The first optical element comprises a mirror with deformable mirror surface. The beam waist is adjustable over the deformation of the mirror surface as function of the interval of the mirrors. Further optical elements are arranged after the first optical element. Each further optical element comprises a mirror with deformable mirror surface. The further mirror is adjustable over the deformation of the mirror surface as function of the interval. The radius is similar to the beam waist. The first optical element is moved with a dynamic that is smaller than the dynamic of the movement sequence of the processing head. The optical element is moved with a dynamic that is faster than the dynamic of the other optical elements. A telescope is used as first optical element. The optical element is formed as mirror with deformable surface, where the deformation of the mirror surface is adjustable in dependent upon the interval of the mirror by a unit so that the radius of the laser beam is held in an area from minimal interval to a maximum interval of the following unit. The optical element is formed as mirror with deformable surface. One of the optical elements is used as beam deflection element that deflects the laser beam in the direction of a further coordinate, which is fixed through a diagonal traverse (7) guidable along the longitudinal traverse. The mirror with deformable mirror surface is used as beam deflection element. The first element is inserted in beam direction towards the beam deflection element, which is inserted between the first optical element and further optical element. The second telescope is arranged in beam direction after the beam deflection element. The optical element forms the first telescope of the beam deflection element, which is arranged above the first telescope. The laser beam is surrounded by sleeve parts that are changeable in its length. The sleeve parts are provided that are divided corresponding to the distribution of the optical element. The sleeve part is arranged in beam direction between the last optical element and the processing head so that it follows the beam dynamics of the processing head. A compensation buffer is provided, whose dimension is changeable. The measurement of the compensation buffer vertical to the dimension is greater than the dimension of the sleeve part vertical to the laser beam.