Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Thyssenkrupp Drauz Nothelfer Gmbh

Thyssen Laser-technik Gmbh

Jan Michel

Wolfgang Schulz

Peter Abels

Stefan Kaierle

Gerhard Alber

Boris Regaard

Friedrich Behr

Jörg Neubert

Anas Moalem

The present invention relates to a method for measuring phase boundaries of a material during the machining of a workpiece () with a machining beam, more preferably with a laser beam, and a device that is embodied in such a way as to carry out the method. According to said method, during the machining, a machining region () containing the impact point of the machining beam () on the workpiece () is illuminated at least approximately coaxially to the machining beam () by means of additional optical radiation (). Radiation () reflected by the machining region () is detected, parallel to an incidence direction of the optical radiation () or at small angle thereto, by means of an optical detector with local resolution, in order to obtain an optical reflection pattern of the machining region (). From the optical reflection pattern, a course of at least one liquid/solid phase boundary in the machining region () is then determined in an automated manner by means of an image processing algorithm on the basis of a transition from an area containing a large-surface homogeneous area and an area containing a plurality of small-surface homogeneous areas in the optical reflection pattern.

Method for measuring phase boundaries of a material during machining with a machining beam using additional illumination radiation and an automated image processing algorithm, and associated device

In a method for cutting structural components to be joined by laser radiation that is guided by a computer-controlled manipulation system provided with a nominal path for each structural component corresponding to a joining line that is curved as a result of at least one of the structural components being three-dimensionally shaped, the structural component surfaces of the structural components including the joining line are determined measuring technologically. Based on measuring results, the nominal path corresponding to a penetration line of the structural components to be joined is calculated. A marking is formed on a first one of the structural component surfaces. When performing the cut on the structural component surface provided with the marking, the resulting cutting gap and the marking are determining measuring technologically. When a deviation of the cutting gap from the nominal path is detected, the manipulation system is controlled to correct the deviation.

Method for laser-cutting structural components to be joined

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Meerbusch, Germany

Jan Michel