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We propose a novel, on-machine method of measuring the profile of the cutting edge of a tool by using the cutting fluid on the tool surface. Despite an environment of on-machine tool profile measurement, it is difficult to measure a cutting edge profile by using conventional optical methods due to interference from the cutting fluid on the tool surface. To overcome this problem, we propose a profile measurement method that uses confocal fluorescent detection from the cutting fluid on the tool surface. Moreover, for precise measurements, a method that corrects for the thickness of the cutting fluid is provided. Fluorescence from the surface of a silicon wafer coated with a fluorescent dye that is set horizontally as well as vertically to the optical axis of a developed fluorescent confocal microscope is detected. As a basic verification, the cutting edge profile of a milling tool with wear is measured using the proposed measuring and correction methods that employ a fluorescent dye. The results confirm that the proposed method can provide detailed measurements of a tool wear profile.

Abstract. We propose a novel on-machine measurement method of the tool cutting edge profile by using cutting fluid adhered on the tool surface. In an environment of on-machine tool profile measurement, the profile is difficult to measure with the conventional optical method since a cutting fluid adhered on the tool surface interferes the measurement. To overcome this problem, we propose the profile measurement method by confocal fluorescent detection from the cutting fluid adhered the tool surface. To verify the fundamental validity of the principle, fluorescence from horizontal and vertical surface were detected with a developped fluorescent confocal microscope by using fluorescent dye and silicon wafer. Furthermore, a cutting edge profile of horizontal plane of milling tool with wear was measured with the proposed method using the fluorescent dye as the basic verification. From this result, it is found that the proposed method enables to measure the tool wear at the surface with the oil adhering slightly, however the measurement capability of the measurement might depend on the thickness of the oil.

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