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Sensors 2008, 8(8), 4866-4877; doi:10.3390/s8084866

A Fast Inspection of Tool Electrode and Drilling Depth in EDM Drilling by Detection Line Algorithm

Department of Mechatronic Engineering, Huafan University, Taipei, Taiwan
Received: 1 July 2008 / Revised: 12 August 2008 / Accepted: 15 August 2008 / Published: 21 August 2008
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Abstract

The purpose of this study was to develop a novel measurement method using a machine vision system. Besides using image processing techniques, the proposed system employs a detection line algorithm that detects the tool electrode length and drilling depth of a workpiece accurately and effectively. Different boundaries of areas on the tool electrode are defined: a baseline between base and normal areas, a ND-line between normal and drilling areas (accumulating carbon area), and a DD-line between drilling area and dielectric fluid droplet on the electrode tip. Accordingly, image processing techniques are employed to extract a tool electrode image, and the centroid, eigenvector, and principle axis of the tool electrode are determined. The developed detection line algorithm (DLA) is then used to detect the baseline, ND-line, and DD-line along the direction of the principle axis. Finally, the tool electrode length and drilling depth of the workpiece are estimated via detected baseline, ND-line, and DD-line. Experimental results show good accuracy and efficiency in estimation of the tool electrode length and drilling depth under different conditions. Hence, this research may provide a reference for industrial application in EDM drilling measurement.
Keywords: Electrical discharge machining (EDM); Electrode length; Drilling depth; Detection line algorithm (DLA); Peak decision method. Electrical discharge machining (EDM); Electrode length; Drilling depth; Detection line algorithm (DLA); Peak decision method.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Huang, K.-Y. A Fast Inspection of Tool Electrode and Drilling Depth in EDM Drilling by Detection Line Algorithm. Sensors 2008, 8, 4866-4877.

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