Cutting by laser-induced shock waves

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In cutting or punching, the geometric accuracy of the tools and their positioning relative to each other becomes increasingly important as the process dimensions decrease. Ensuring a very precise cutting clearance between the punch and die is a particular challenge in the processing of metallic foil materials in the micro range. The "laser shock-cutting" method offers a solution, particularly in the area of small process dimensions because it provides an approach for process simplification. Compared to mechanical cutting, laser shock-cutting dispenses with the problem of tool positioning because either the punch or die is replaced by a laser-induced shock wave. For establishment of this process, knowledge of the relevant parameters and the process boundaries is necessary. The aim of the proposed research project is therefore to understand how the foil thickness, workpiece material, and grain size affect both the cut-edge geometry and achievable cutting quality. The working hypothesis intended to be verified is that the ductility decreases with a decreasing number of grains over the foil cross-section and at the same time, the separability of the material is improved in laser shock cutting.