Patent EP-2289708-A1 (EP)
Inventor: ESPE ROLF DR RER NAT
IPC: B23K26/08
Filed: 2009-08-26
Abstract: The method for the production of a surface structure of a metallic pressed plates, endless bands or a cylindrical embossing roller using laser, comprises providing and utilizing digitalized data of a 3D-topography of a formed surface structure, utilizing the digitalized data for position controlling of a laser in a plain stretched by a x and y coordinate, utilizing the z-coordinate for focusing a laser beam, and partially wearing out the surface through a laser beam for re-producing a pre-determined surface structure. The method for the production of a surface structure of a metallic pressed plates, endless bands or a cylindrical embossing roller using laser, comprises providing and utilizing digitalized data of a 3D-topography of a formed surface structure, utilizing the digitalized data for position controlling of a laser in a plain stretched by a x and y coordinate, utilizing the z-coordinate for focusing a laser beam, and partially wearing out the surface through a laser beam for re-producing a pre-determined surface structure. The lasers are used for processing in a coordinate direction in the plain and are moved away totally in the direction of the further coordinate. The focusing of the laser beam is carried out up to 250 mu m against the surface in a depth and in a diameter of 2-10 nm in dependent upon a distance change between the surface and the laser optic. The laser beam emerges under an angle to vertical on the surface. A fiber laser is used with an energy of 20-40 Watt or a pulsed fiber laser is used with a power of 20-40 Watt, a wavelength of 532-1064 nm and a pulse energy of 1 mJ in a pulse duration of 100 nanoseconds with a repetition rate of 20-80 kHertz. The laser arrangement consists of laser, a beam expanding device and a focusing device. The energy of the laser is reduced through a laser attenuator. The focusing device is arranged in an interval of 10-100 cm against the surface and the surface structure is subdivided independently by a self-repeating report into part areas, which are sequentially worked by a laser or partially worked by lasers. The boundary of the part areas is determined freely so that the boundary collapses with unfinished areas of the surface. The determined part areas have an edge length of 50-500 cm in dependent upon the used laser and are processed with laser and laser optics. On the surface, measuring points are provided, which allow controlling of the laser and/or focusing device position so that a correction control is carried out. The naturally grown raw materials such as wood surfaces or natural stone surfaces or ceramic surfaces are reproduced by the use of digitalized data of the surface structure. Scanners are provided for detecting the digitalized data, which naturally detect the total surface of the model by tiltable mirror or through sensing the total surface structure by laser beam diverted through a mirror or through the use of gradation pictures of the surface structure for calculating digitalized data for regulating the 3D-topography or detects the reflexions. The conversion of the detected digital data is carried out through interpolation and data reduction for controlling the laser optics. An independent claim is included for a device for the production of a surface structure of metallic pressed plates, endless bands or a cylindrical embossing roller.