OBRABOTKAMETALLOV Vol. 28 No. 3 2026 127 TECHNOLOGY References 1. VinogradovaA.A., GrichukhaM.I., SmirnovaE.E. Comparative assessment of documentation referred to surface roughness measurement. Journal of Physics: Conference Series, 2021, vol. 1728, p. 012025. DOI: 10.1088/17426596/1728/1/012025. 2. ISO 4287:1997. Geometrical Product Specifi cations (GPS) – Surface texture: Profi le method – Terms, defi nitions and surface texture parameters. 3. ISO 3274:1996. Geometrical Product Specifi cations (GPS) – Surface texture: Profi le method – Nominal characteristics of contact (stylus) instruments. Evaluation of contact and optical profi lometry in the control of the roughness of curved surfaces of machine parts Ervin Umerov 1, 2, a, *, Arkady Soloviev 1, b Yuriy Egorov 2, c, Vladimir Skakun 1, 2, d, Ivan Sobolevsky 1, e, Ruslan Dzhemalyadinov 1, 2, f 1 Crimean Engineering and Pedagogical University named after Fevzi Yakubov, 8 Uchebnyy side str., Simferopol, 295015, Russian Federation 2 V.I. Vernadsky Crimean Federal University, 4 Academician Vernadsky Ave., Simferopol, 295007, Russian Federation a https://orcid.org/0000-0003-3477-2036, Ervin777@yandex.ru; b https://orcid.org/0000-0001-8465-5554, solovievarc@gmail.com; c https://orcid.org/0000-0003-4990-9998, yuriyegorov@cfuv.ru; d https://orcid.org/0000-0003-0656-7852, vladimir.skakun.92@list.ru; e https://orcid.org/0000-0002-1338-9065, sobolevskii-ivan@mail.ru; f https://orcid.org/0000-0003-3319-3542, rus.dzhemalyadinov@mail.ru Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2026 vol. 28 no. 3 pp. 112–128 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2026-28.3-112-128 ART I CLE I NFO Article history: Received: 30 May 2026 Revised: 13 June 2026 Accepted: 29 July 2026 Available online: 15 September 2026 Keywords: Contact profi lometry Optical profi lometry Surface roughness Curved surfaces Error correction Funding The research was carried out with the fi nancial support of the Russian Science Foundation (project No. 2412-20013). ABSTRACT Introduction. Roughness measurement of curved machine parts is a critical metrology task, determining the performance characteristics of the components. The contact method introduces systematic error due to the straightline trajectory of the probe and the plastic deformation of microroughness. Non-contact optical methods eliminate mechanical stress, but their accuracy decreases in areas with a large local inclination angle due to the shadowing eff ect. The lack of a unifi ed approach to comparing results for curved surfaces limits the ability to tighten tolerances. The purpose of the work is to conduct a comprehensive comparative analysis of contact and optical profi lometry in measuring the roughness of curved surfaces and to develop mathematical models for correcting systematic errors. Materials and methods. Experiments were conducted on samples of 0.45% C steel and GG20 cast iron with curvature radii of 2–25 mm and roughness parameters Ra = 0.1–12.5 μm. Contact measurements were performed using a TIME TR200 profi lometer, while optical measurements were performed using a Veeco Wyko NT9100 in vertical scanning interferometry and phase shift interferometry modes. Statistical processing included Student’s t-test, correlation, and regression analysis. Results and discussion. The error of the contact method at a radius of 2 mm reaches +27.6%, at R = 25 mm it is no more than +1.4%. The optical method is resistant to curvature, but in areas with high curvature leads to an underestimation of Ra by 10–15% due to the shadowing eff ect. For fl at surfaces (Ra = 0.8–6.3 μm), there are no signifi cant diff erences between the methods (r = 0.98). Mathematical models have been developed to correct the infl uence of temperature, contamination, roughness orientation, vibration, and contact force. Conclusions. An algorithm for selecting a measurement method is proposed: for radii of curvature less than 10 mm, the optical method with geometric correction is recommended; the contact method is not applicable for radii less than 5 mm. The obtained models can be integrated into the profi lometer software for automatic error compensation. For citation: Umerov E.D., Soloviev A.N., Egorov Y.A., Skakun V.V., Sobolevsky I.V., Dzhemalyadinov R.M. Evaluation of contact and optical profi lometry in the control of the roughness of curved surfaces of machine parts. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science, 2026, vol. 28, no. 3, pp. 112–128. DOI: 10.17212/1994-6309-2026-28.3-112-128. (In Russian). ______ * Corresponding author Umerov Ervin D., Ph.D. (Engineering), Associate Professor Crimean Engineering and Pedagogical University named after Fevzi Yakubov, 8 Uchebnyy side str., 295015, Simferopol, Russian Federation Tel.: +7 978 832-72-92, e-mail: Ervin777@yandex.ru
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