Quantitative analysis of thermographic inspection results for assessing temperature dynamics during external turning
DOI:
https://doi.org/10.15276/opu.1.73.2026.07Keywords:
thermographic investigation, cutting zone, maximum temperature, frame-by-frame analysis, logarithmic approximationAbstract
The article examines an approach to the quantitative processing of thermographic data obtained during external turning of steel workpieces. The relevance of the study is driven by the need not only for visual monitoring of the temperature field but also for the generation of numerical indicators characterising the variation of the thermal state of the cutting zone over time. The proposed approach is based on frame-by-frame analysis of thermographic video recordings, determination of maximum temperature values within a selected region of interest, and the construction of time-dependent relationships of the maximum temperature. The study was carried out for the following workpiece materials: steel С22, stainless steel X6CrNiTi18-10, and steel 41Cr4 under identical machining conditions. To reduce the influence of short-duration local fluctuations, smoothing by the method of centred moving average over five points was applied. The general character of temperature variation was described by logarithmic approximation, and the agreement between the model and the experimental data was assessed using the coefficient of determination. It is demonstrated that for all investigated materials, the temperature relationships share common features: a rapid temperature increase at the beginning of machining, followed by a transition to a slower rise in the temperature level with local fluctuations. The most intensive temperature increase was established for steel 41Cr4, whilst for steel С22 the temperature trend is less pronounced. The obtained results confirm the appropriateness of employing frame-by-frame analysis of thermographic recordings for the quantitative assessment of temperature dynamics in the cutting zone and for the comparison of the thermal state of the machining process for different materials. The practical significance of the approach lies in the possibility of utilising the obtained relationships for the further substantiation of cutting regimes and monitoring of the stability of the thermal state.
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