Zusammenfassung
During the milling of metals, a minimum quantity of lubricant has to be guided to the cutting edge of the tool. In the framework of this work, this fluid transport is passively implemented by the capillary effect like it is present in the open microfluidic systems of various natural materials. One promising approach for the fabrication of microchannels is micromachining with ultrashort laser pulses. In the present work, using ultrashort laser pulses, such biomimetic microchannels for passive transport were micromachined on cemented tungsten carbide. The biomimetic microchannels provide a hierarchical structure consisting of a wide channel with a width of 450 μm and subchannels with a width of 50 μm. To evaluate the lubricant transport, flow velocity measurements of structures of different depths were performed. The biomimetic structure with a total depth of 200 μm shows very promising results with a maximum flow rate of 0.35 mm³/s.
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