Abstract
To improve economy and as a contribution in quality assurance in the domain of machining metallic materials a method for automatic tool wear monitoring at turning and drilling has been developed based on the analysis of the acoustic emission (AE) generated on the tool at machining procedure (machining noise). Different wear types (tool flank face and tool chipping) result in changes of the different characteristic values of the continuous part of AE. In case of a uniform abrasion of the insert, e.g. flank face or crater wear, an increased mean signal level is observed, whereas for microbreakage at tool edge, an increase of the crest factor with nearly constant mean signal level is found. The burst-like signals from collision between chip and tool and from chip breakage have to be eliminated from analysis to avoid the distorsion of the signal parameters of continuous AE. This method should be well suited especially for monitoring of finishing processes (with small depth of cut).
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