ROUGHNESS MEASUREMENT VERIFICATION OF THE SURFACE STRUCTURES PRODUCED BY DIFFERENT MANUFACTURING TECHNIQUES USING WAVELET TRANSFORM

Ismail Bogrekci, Pinar Demircioglu, Yunus Cerci, Coskun Deniz, Numan M. Durakbasa

Abstract

In this study, roughness measurement verification was conducted using wavelet transform for the surface structures produced by different manufacturing techniques. These are surface grinding, front milling and face turning. After manufacturing, the surface roughness values were measured by means of stylus profilometer as contact measurement technique. Then, manufactured surface images were captured and inspected by 3D digital microscope. The captured images were then pre-processed using high pass filter in order to enhance the image before further image analyses conducted. Discrete Wavelet Transform in 2D image processing identifies different frequency components of images. This method was generally used to identify different surface topography produced by different manufacturing processes. <BR />Non-contact (imaging) and contact (stylus profilometer) measurements of surface roughness were compared by employing the image processing method such as Wavelet transform and Ra values taken from stylus profilometer. Ra as 2D roughness parameter is evaluated in order to both determine and verify the roughness values obtained from measurement technique as stylus profilometer.<BR />The values computed with the proposed method were compared with the roughness values obtained from 3D digital microscope. The relationship between wavelet parameters and surface roughness was determined (Stdv: 70.41, 77.22, 89.81 and corresponding Ra: 0.498, 2.382 and 3.984 µm for ground, front milled and face turned surfaces, respectively).

Keywords

computer vision, manufacturing techniques, roughness measurement, wavelet transform

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IMEKO TC

TC14 - Measurement of Geometrical Quantities

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