Актуальные проблемы в машиностроении. Том 10. № 1-2. 2023 Инновационные технологии в машиностроении ____________________________________________________________________ 9 Fig. 1. Temperature θ and heat flow power q depending on the relative length of chip contact with the front surface of the cutter Methodology To clarify the level and nature of the temperature distribution on the surfaces of the cutter, Chao, Trigger and Lee [8] in 1961 presented a method for measuring temperatures on the rear surface of the cutter during turning using lead sulfide photoresistors (Fig. 2); a tubular workpiece, inside which the block of photoresistance was laid at a distance of not more than 1 inch (25.4 mm) from the surface being machined, was used. A 0.094-inch (2.38 mm) diameter hole was drilled into the pipe wall. When turning the outer surface of the workpiece, whenever the cutter was in the zone of this hole, the thermal radiation from the rear surface of the cutter was captured by the detector, and the recording device provided information about the average temperature of the rear surface. Fig. 2. Scheme for measuring temperature using photoresistance. To determine the heat flow entering the tool, Chao and Trigger used the electrical simulation method proposed in 1955 by Jacques Bonneville and based on analogy in distribution heat flow and
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