General Materials Science, General Engineering, Metals and Alloys, Civil and Structural Engineering
14
Scopus Publications
Scopus Publications
Increasing the Durability of Cutting Tools Through Additional Low-Temperature Heat Treatment after Sharpening Tatiana Chumachenko, Alla Bespalova, Oleksij Knush Materials Science Forum, 2025 The tool stability and its wear are important factors that determine the patterns of change in systematic and random errors during processing. The higher the tool stability and, consequently, the lower the wear intensity over time, the longer the period of time the part error does not exceed the tolerance field and the less often it is necessary to re-adjust the equipment and re-grind the tool. Cold treatment of a blade tool to cryogenic temperatures after sharpening can make it possible to significantly increase its stability. The purpose of processing hardened steel at a temperature below room temperature is to remove residual austenite from the structure and subsequently affects the properties of the steel. In the martensitic transformation interval, between the temperatures and, ordinary room temperature is a stop that interrupts the course of transformations during cooling. Thus, cooling below zero is a natural part of the steel hardening process.
Methods for Measuring Grinding Temperatures Ala Bezpalova, Vladimir Lebedev, Tatiana Chumachenko, Olga Frolenkova, Nataliya Klymenko Lecture Notes in Mechanical Engineering, 2022
ANALYSIS OF CUTTING FORCES DURING GRINDING OF TITANIUM ALLOY AND CORROSION-RESISTANT STEEL BY DIAMOND, ELECTROCORUNDUM AND CUBIC BORINE NITRID WHEELS Vladimir Lebedev, Tatiana Chumachenko, Alla Bespalova, Tatiana Nikolaeva, Yevhen Omelchenko Technology Audit and Production Reserves, 2021 The object of research is the process of circular and surface grinding of titanium alloy and corrosion-resistant steel, namely, the cutting forces arising from mechanical processing. One of the most problematic areas in work is the selection of the required grinding modes, material and grinding wheel grain size. In the course of the experiment, we used samples of VT8 titanium alloy and 12Х18N9T steel, on which the grinding process was studied with wheels made of various materials (electrocorundum, cubic boron nitride (CBN), diamond). The values of the cutting forces Py and Pz were obtained in the latitude of permissible modes, which are most often used in circular and flat grinding, and can reach maximum values, respectively, Py=27 N, Pz=15.5 N. The data were obtained at a low wheel speed from electrocorundum, about 15 m/s and grain size 8. By reducing the grain size of the wheel, we get the effect of increasing the energy consumption of the grinding process, due to the increase in the values of the cutting forces. If we compare the cutting forces arising from grinding with different wheels, then the following can be noted. Compared to electrocorundum wheels, when using CBN wheels, the cutting forces are reduced by 20–25 %, and when grinding with diamond wheels (despite the high wear of the diamond wheel), the effect of cutting forces is reduced by 25–30 %. This is due to the fact that cutting conditions are the most favorable for diamond and CBN grains, which makes it possible to use more intense cutting conditions. The results of the study allow predicting the performance of the grinding wheel, reducing the energy consumption of production, and also adjusting the processing mode of the part to obtain the necessary quality indicators of the surface layer and the geometric dimensions of the part.