Details
Original language | English |
---|---|
Pages (from-to) | 5-10 |
Number of pages | 6 |
Journal | Tribologie und Schmierungstechnik |
Volume | 70 |
Issue number | 1 |
Publication status | Published - 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
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Materials Science(all)
- Surfaces, Coatings and Films
- Physics and Astronomy(all)
- Surfaces and Interfaces
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In: Tribologie und Schmierungstechnik, Vol. 70, No. 1, 27.03.2023, p. 5-10.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Application of batch manufactured flexible micro-grinding tools on copper and oxidized copper surfaces
AU - Steinhoff, Lukas
AU - Dencker, Folke
AU - Wurz, Marc Christopher
PY - 2023/3/27
Y1 - 2023/3/27
N2 - 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.
AB - 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.
KW - Anodic oxidation
KW - copper machining
KW - high precision machining
KW - micro-grinding
KW - precision engineering
UR - http://www.scopus.com/inward/record.url?scp=85166651622&partnerID=8YFLogxK
U2 - 10.24053/tus-2023-0002
DO - 10.24053/tus-2023-0002
M3 - Article
VL - 70
SP - 5
EP - 10
JO - Tribologie und Schmierungstechnik
JF - Tribologie und Schmierungstechnik
SN - 0724-3472
IS - 1
ER -