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A CHARACTERIZATION OF PROCESS-SURFACE TEXTURE INTERACTIONS IN MICRO-EDM USING MULTI-SCALE CURVATURE TENSOR ANALYSIS

[+] Author and Article Information
Tomasz Bartkowiak

Institute of Mechanical Technology, Poznan University of Technology, Pl. Marii Skłodowskiej-Curie 5, 60-965 Poznań
tomasz.bartkowiak@put.poznan.pl

Christopher A. Brown

Surface Metrology Laboratory, Worcester Polytechnic Institute, 100 Institute Road, Worcester, Massachusetts, USA
brown@wpi.edu

1Corresponding author.

ASME doi:10.1115/1.4037601 History: Received April 30, 2017; Revised August 08, 2017

Abstract

The objectives of this work are to demonstrate the use of multi-scale curvature tensor analysis for characterizing surfaces of stainless steel created by micro-electric discharge machining (µEDM), and to study the strengths of the correlations between discharge energies and resulting surface curvatures (i.e., principal, Gaussian or mean curvatures) and how they change with scale. Surfaces were created by µ-EDM techniques using energies from 18nJ to 16 500nJ and measured by confocal microscope. The curvature tensor T is calculated using three proximate unit vectors normal to the surface. The multi-scale effect is achieved by changing the size of the sampling interval for the estimation of the normals. Normals are estimated from regular meshes by applying a covariance matrix method. Strong correlations (R2>0.9) are observed between calculated principal maximal and minimal as well as mean and Gaussian curvatures and discharge energies. This method allows detailed analysis of the nature of surface topographies, and suggests that different formation processes governed the creation of surfaces created by higher energies.

Copyright (c) 2017 by ASME
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