Dr. Uwe Teicher Profile

Dr. Uwe Teicher

at TU Dresden

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Publications (2)

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Proceedings Article | 17 March 2023 Poster + Paper

Improvement of cutting tools using laser-induced periodic surface structures for machining aluminium alloy Al 6061 T6

Robert Baumann, Yasmine Bouraoui, Uwe Teicher, Erik Selbmann, Steffen Ihlenfeld, Andrés Fabián Lasagni

Proceedings Volume 12409, 124091B (2023) https://doi.org/10.1117/12.2648755

KEYWORDS: Aluminum, Surface roughness, Tungsten, Laser processing, Manufacturing, Alloys, Scanning electron microscopy, Interfaces

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Improving processes sustainability to address upcoming demands in metal processing industries such as innovative and hard to process materials has become a major topic for many manufacturers. Therefore, new tool material compositions or surface coatings are continuously developed. In this context, surface functionalization of cutting tools is foreseen as a convenient approach for minimizing material losses and thus energy consumption. In this work, laser induced periodic surface structures (LIPSS) are used for manufacturing quasi-periodic line-like patterns on tungsten carbide inserts. The textured tool surfaces show low spatial frequency LIPSS (LSFL) with spatial periods of 500 nm to 600 nm as well as high spatial frequency LIPSS (HSFL) with a spatial period of ~100 nm. Furthermore, the texturing is applied on rake and flank faces of the cutting tools with different offsets to the edge between 0 and 0.2 mm. The wettability analysis reveals a decrease of static contact angles for the used cutting fluid (CIMSTAR) from 38° to 12°, suggesting an improved cooling process during the machining step. In addition, turning experiments under lubricated conditions are carried out on Al 6061 T6 parts to investigate the tribological performance. The used LIPSS-functionalized cutting tools could effectively decrease the main machining forces by 10 %, the feed force by 21 % and the passive force by 9 %. Furthermore, the laserprocessed tools generate thinner chips, which leads to a decrease in surface roughness by 31 % of the aluminum work piece.

Proceedings Article | 17 March 2023 Presentation + Paper

Direct laser interference patterning of cemented cutting tools

Robert Baumann, Yasmine Bouraoui, Uwe Teicher, Erik Selbmann, Steffen Ihlenfeld, Andrés Fabián Lasagni

Proceedings Volume 12409, 124090Q (2023) https://doi.org/10.1117/12.2648729

KEYWORDS: Aluminum, Tungsten, Manufacturing, Scanning electron microscopy, Interfaces, Surface roughness, Metals

Read Abstract +

Nowadays, improving processes sustainability has become a major topic for many manufacturers in metal processing industries. Next to the challenging rise of costs of raw material and tools, innovative and hard to process materials enter the market. Here, surface functionalization of cutting tools is devised as a convenient approach for reducing energy consumption as well as material losses. In this work, direct laser interference patterning (DLIP) is used for manufacturing periodic line-like structures with spatial periods of 5.5 μm on tungsten carbide. The texturing is applied on rake-flank faces of the cutting inserts, leading to texture depths up to 1.75 μm by controlling the amount of used laser pulses. Moreover, turning experiments under lubricated conditions carried out on Al 6061 T6 parts with structured and untreated tools are performed to investigate the tribological performance. In result, the used DLIP-functionalized cutting tools could effectively decrease machining forces up to 12 %. This is caused by the corresponding improvement in frictional and improved lubrication behavior at the tool/chip interface. Furthermore, the laser-processed tools generate thinner chips, which leads to a decrease in surface roughness by 31 % of the aluminum work piece. This work thus offers insight into the viability of improving cutting tools by laser surface micro patterning for upcoming innovative materials designed for improving tool wear resistance, energy efficiency and surface quality.

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