Tools and Strategies for Grinding of Riblets on Freeformed Compressor Blades

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Denkena, B.; Grove, T.; Krawczyk, T.: Tools and Strategies for Grinding of Riblets on Freeformed Compressor Blades. In: Procedia CIRP 55 (2016), S. 182-187. DOI: https://doi.org/10.1016/j.procir.2016.09.010

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To cite the version in the repository, please use this identifier: https://doi.org/10.15488/1068

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Sum total of downloads: 275




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Abstract: 
A major goal in the design of turbomachinery is the increase of efficiency. To attain this increase, the flow losses must be reduced. A substantial proportion of the losses is generated by skin friction between compressor blades and working fluid. With respect to smooth surfaces, micropatterns (riblet-structures) reduce skin friction in turbulent flow by up to 10%. Grinding with multiprofiled wheels is an effective method for the manufacturing of riblet-structures on large plane surfaces. However, the grinding wheel wear affects the accuracy of the riblet geometry and the efficiency of the manufacturing process. Therefore, this paper shows the potential of different grinding wheel types for the manufacturing of riblet structures on an industrial scale with regard to tool wear. The results show that vitrified bonded tools are not suitable for the structuring of compressor blades. Here, axial forces lead to high profile wear. In contrast, grinding wheels with a metal bond are more wear resistant. However, the dressing process of metal bonded tools is time-consuming and causes 80% of the total machining time. As a consequence, just one blade can be structured per day. To increase the efficiency, a new grinding wheel was developed, which is bionically inspired by beaver teeth. The tool is constructed of alternating layers consisting of metal bonded diamonds and pure resin respectively. With this layer-by-layer setup, the tool does not have to be dressed and enables structuring of up to 50 compressor blades per day.
License of this version: CC BY-NC-ND 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2016
Appears in Collections:Fakultät für Maschinenbau

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pos. country downloads
total perc.
1 image of flag of Germany Germany 200 72.73%
2 image of flag of United States United States 32 11.64%
3 image of flag of China China 13 4.73%
4 image of flag of India India 5 1.82%
5 image of flag of France France 5 1.82%
6 image of flag of Namibia Namibia 4 1.45%
7 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 2 0.73%
8 image of flag of Israel Israel 2 0.73%
9 image of flag of United Kingdom United Kingdom 2 0.73%
10 image of flag of Canada Canada 2 0.73%
    other countries 8 2.91%

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