Correlation of the holes quality with the force signals in a microdrilling process of a sintered tungsten-copper alloy

  • Gerardo BeruvidesEmail author
  • Ramón Quiza
  • Raúl del Toro
  • Fernando Castaño
  • Rodolfo E. Haber


Holes quality errors are an undesired but unavoidable consequence in drilling operations. Due to the small dimensions involved in the microdrilling processes, quality measurement and control must be carried out offline, by using microscopy or other high precision measurement devices. This paper presents a study about the correlation between the holes quality and the force signals in the microdilling process of 0.1 mm and 0.5 mm-diameter holes in a sintered tungsten-copper alloy. The surface of the obtained holes was scanned by means of an interferometry microscope and the error of the holes was computed from the scanned data. The three components of the forces were measured during all the drilling process. The behavior of these signals, in three different intervals (tool entrance, forward motion and backward motion) was described by wavelet package analysis. The features having higher correlation with the holes quality error were the average power of the axial component of the forces in the frequency bands of 0~391 Hz and 3906~4297 Hz, during the backward motion. With these features, a statistical regression model was fitted. The main outcomes of this study are the basement for obtaining reliable models for monitoring systems in microdrilling operations.


Holes quality errors Microdrilling Modeling Signal feature extraction Wavelet package analysis 



x-component of the force


y-component of the force


z-component of the force


overall angle of the section


angular step


diameter of the circumference


x-coordinate of the boundary points


y-coordinate of the boundary points


radius of the circumference


holes quality error


coefficient of determination


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Copyright information

© Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Gerardo Beruvides
    • 1
    • 3
    Email author
  • Ramón Quiza
    • 1
  • Raúl del Toro
    • 3
  • Fernando Castaño
    • 3
  • Rodolfo E. Haber
    • 2
    • 3
  1. 1.Department of Mechanical EngineeringUniversity of MatanzasMatanzasCuba
  2. 2.Department of Informatics EngineeringAutonomous University of MadridMadridSpain
  3. 3.Center for Automation and RoboticMadridSpain

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