An experimental investigation on surface generation in ultraprecision machining of particle reinforced metal matrix composites

Abstract

Ultraprecision machining of metal matrix composites (MMCs) is observed as a scientific challenge, due to their hard-to-machine property and often the poor surface finish. This paper presents an experimental investigation on surface generation in ultraprecision machining of Al/B4C/50p MMCs. The machining trials using straight flute polycrystalline diamond (PCD) tools are conducted on a high precision micro milling machine. Side milling is adopted under varied cutting conditions. Metrology assessments on the workpiece surface roughness, topography, texture and defects/features are undertaken using a ZYGO 3D surface profiler and a scanning electron microscope (SEM). Experimental results indicate that process parameters and their contributions play essential roles in the machining process. By applying the optimal process parameters, e.g. cutting speed of 188.496 m/min, feed rate of 10 μm/rev and axial depth of cut of 150 μm, a better surface generation with surface roughness Ra < 20 nm can be obtained in ultraprecision machining of Al/B4C/50p particulate MMCs.

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Acknowledgements

The authors thank Professor G.H. Wu and his team at Harbin Institute of Technology in providing the MMC materials, and the interesting and helpful discussion on the MMC materials design and fabrication.

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Correspondence to Zhichao Niu.

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Niu, Z., Cheng, K. An experimental investigation on surface generation in ultraprecision machining of particle reinforced metal matrix composites. Int J Adv Manuf Technol 105, 4499–4507 (2019). https://doi.org/10.1007/s00170-018-03256-y

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Keywords

  • Ultraprecision machining
  • Micro milling
  • Metal matrix composites
  • Polycrystalline diamond tools
  • Surface roughness