Laser drilling of green ceramic tapes: pulse duration/shape effects

Laser drilling of engineering materials is well established process. Latest developments in laser sources offer enormous flexibility but also present challenges. Laser material interaction governs the material removal process and correct laser parameters are key to successful processing. New generation fiber lasers offer 25 different pulse shapes/durations ranging from 15ns up to 220 ns. Those different waveforms offer different pulse energies as well. The paper discusses effect on the green ceramic tapes when processed with various pulse lengths/shapes in terms of resulting diameter, accuracy and qualit

Development and implementation of technology for laser micro structuring of rollers

Laser milling of flat substrates is quite well established process, where laser structuring of rollers is still in development. Due to the large varieties of laser sources, stages, control systems and CAD/CAM systems, it is difficult to create solution that works for all systems. In order to generate control programs for the machine for rollers structuring usually multi axis machining is employed, enabling simultaneous rotation and translations. Taking into account complexity of the task and accuracy required for such applications it takes much longer time for calculation and significantly enlarges the resulting program code. The paper discusses simplified method for laser micro structuring of rollers

Layer based micro-machining: new approach for tool-path generation

This paper proposes a new tool-path generation approach for layer-based micro machining (“conventional”, laser or EDM milling). With this approach, the laser spot non-conformity or EDM tool wear is compensated for by varying the layer machining angle and start point while the material removal volumes are represented by a sequence of 2D slices. Tool-path generation is performed taking into account the specific requirements of 3D micro-machining. The capabilities of the developed CAM system have been verified experimentally

A Novel Approach for Size Up-Scaling of Nickel Master for the Replication of Micro and Nano Features

This paper proposes a novel approach and a process chain for precision assembly of nano imprinted Ni shims on a larger Ni master plate and fixing them using laser welding. The capabilities of micro-manufacturing technologies (milling and assembly) were combined with those of nano-manufacturing to stitch produced Ni shims on a template in order to achieve a relatively large area for further imprinting using Roll-To-Roll (R2R) technology. The results of two setups are shown and analysed with the main sources of errors pointed out. Laser welding of the assembly tests were carried out in order to investigate the best of the welding path geometries commonly used in "macro" world