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Production Engineering

, Volume 13, Issue 5, pp 529–538 | Cite as

Peck drilling of CFRP/titanium stacks: effect of tool wear on hole dimensional and geometrical accuracy

  • Umberto PriscoEmail author
  • Filomena Impero
  • F. Rubino
Machine Tool
  • 28 Downloads

Abstract

The effect of tool wear on dimensional and geometrical accuracy of holes machined by peck drilling in carbon fibre reinforced plastic (CRFP) and titanium (Ti) stacks is studied. Coated and uncoated tungsten carbide drills of both fine and ultra-fine microstructures are employed to assess the importance of grain size and coating on hole accuracy. Hole profiles show two maxima: one at the hole entry and the other at the CFRP/Ti interface. Hole cylindricity as function of tool wear shows a minimum. It firstly decreases due to flank wear and subsequent reduction of the drill diameter. Then the rise of tool instability prevails with the result that an increase of the cylindricity with tool wear is brought about. Less wear-resistant drills attain this minimum in a shorter time of cutting.

Keywords

Drilling Cylindricity Diameter Accuracy Burr Tool wear 

Notes

Acknowledgements

The authors express gratitude to prof. A. Squillace and prof. P. Carlone for their continued and useful advice.

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Copyright information

© German Academic Society for Production Engineering (WGP) 2019

Authors and Affiliations

  1. 1.Department of Chemical, Materials and Production EngineeringUniversity of Napoli Federico IINaplesItaly
  2. 2.Institute for Innovation in Sustainable Engineering (IISE)University of DerbyDerbyUK

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