Application of batch manufactured flexible micro-grinding tools on copper and oxidized copper surfaces

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Original languageEnglish
Pages (from-to)5-10
Number of pages6
JournalTribologie und Schmierungstechnik
Volume70
Issue number1
Publication statusPublished - 27 Mar 2023

Abstract

As copper is a rather difficult material to machine due to its ductility compared to aluminium, this study presents the approach of oxidizing the surface to improve the results of the grinding process. Therefore, batch manufactured flexible micro-grinding tools are used for grinding of copper and oxidized copper surfaces to machine microstructure or local areas of functional surfaces. Besides, we show a comparison of the performance of an abrasive layer made of silicon carbide (SiC) and cubic boron nitride (cBN). The tools are made of a polyimide-based abrasive layer and silicon as substrate and are fabricated by photolithography and deep reactive ion etching. The oxidation of copper surfaces is done by electrochemical processes and are directly machined with grinding tools. The surface quality is evaluated concerning the surface roughness by optical measurements with confocal microscopy. Lower roughness values are achieved on both, the pure copper and the oxidized copper by using SiC grinding tools. On pure copper this is reflected in a reduction of the arithmetical mean roughness value Ra to 0.04 um. The unprocessed reference surface shows an Ra of 0.24 um. In addition, the machined oxidized surfaces show a reduction of the mean roughness depth Rz from 7,60 um to 1.10 um, which is an optimization of factor 2 compared to the machined non-oxidized copper surfaces (2.32 um). The machining of copper with cBN micro-grinding tools also shows improved roughness values, but in comparison to the SiC tools these are 50 % higher for machined copper surfaces and similar for machined oxidized copper surfaces. While the oxidation of the copper surface has a positive effect on the surface quality, no effect on tool wear can be observed.

Keywords

    Anodic oxidation, copper machining, high precision machining, micro-grinding, precision engineering

ASJC Scopus subject areas

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Application of batch manufactured flexible micro-grinding tools on copper and oxidized copper surfaces. / Steinhoff, Lukas; Dencker, Folke; Wurz, Marc Christopher.
In: Tribologie und Schmierungstechnik, Vol. 70, No. 1, 27.03.2023, p. 5-10.

Research output: Contribution to journalArticleResearchpeer review

Steinhoff L, Dencker F, Wurz MC. Application of batch manufactured flexible micro-grinding tools on copper and oxidized copper surfaces. Tribologie und Schmierungstechnik. 2023 Mar 27;70(1):5-10. doi: 10.24053/tus-2023-0002
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