Features of the use of hemispherical end mills when processing high-hardness layers of material of workpieces

The complexity of milling high-hard layers of blanks of parts is associated with a low durability period of milling cutters, including the end hemispheres. Such cutters are designed to perform complex surfaces in the form of semicircular recesses and annular recesses on the workpiece of the manufactured part. Such surfaces are usually used to place seals in them between the mating parts. Skif-M LLC has released two catalogues on milling cutters: in 2019, "Prefabricated milling cutters and replaceable carbide plates for milling" and in 2023, "SKIF-M monolithic carbide milling cutters". They do not contain information about the parameters of the cutting mode (cutting speed, cutting depth, feed). Therefore, it is necessary to identify the values of these parameters. Especially for the case of processing blanks of parts made of high-hardness materials or containing high-hardness layers. Here, high-hardness materials are understood to have a hardness of HRC 65 or higher. The paper presents the results of using such milling cutters using the example of milling cutters manufactured by SKIF-M LLC (Belgorod). It is shown that hemispherical milling cutters are competitive with prefabricated milling cutters when used with a cutting depth of up to 2 mm. Hemisphere cutters should not be operated with a cutting depth of more than 2 mm.
EDN: JTJHVL, https://elibrary/jtjhvl

References

[1] Kirichek A.V., Solovyev D.L., Lazutkin A.G. Tekhnologiya i oborudovanie statiko-impulsnoy obrabotki poverkhnostnym plasticheskim deformirovaniem [Technology and equipment of static-pulse processing by surface plastic deformation]. Moscow, Mashinostroenie Publ., 2004. 287 p. (In Russ.).

[2] Lazutkin A.G., Kirichek A.V., Stepanov Yu.S. et al. Mekhanika nagruzheniya poverkhnosti volnoy deformatsii [Mechanics of loading of a surface by a deformation wave]. Moscow, Mashinostroenie Publ., 2005. 148 p. (In Russ.).

[3] Mokritskiy B.Ya., Shelkovnikov V.Yu. Blade machining of workpieces of the details, that have strengthening by high-hardness surfacing. Metalloobrabotka [Metalworking], 2021, no. 2, pp. 3–7, doi: https://doi.org/10.25960/mo.2021.2.3 (in Russ.).

[4] Mokritskiy B.Ya. A tool for milling workpieces with high hardness surfacing. Metalloobrabotka [Metalworking], 2021, no. 5–6, pp. 3–9, doi: https://doi.org/10.25960/mo.2021.5-6.3 (in Russ.).

[5] Grigoryev S.N. Metody povysheniya stoykosti rezhushchego instrumenta [Methods of increasing the durability of cutting tools]. Moscow, Mashinostroenie Publ., 2011. 368 p. (In Russ.).

[6] Chen H., Zhou A. Orbital-free density functional theory for molecular structure calculations. NMTMA, 2008, vol. 1, no. 1, pp. 1–28. (In Russ.).

[7] Barbyshev B.V., Putilova U.S., Nekrasov R.Yu. Mekhanika deformirovaniya i razrusheniya pri rezanii. T. 1. Nestatsionarnyy protsess rezaniya [Mechanics of deformation and fracture in cutting. Т. 1. Non-stationary cutting process]. Tyumen, TyumGNGU Publ., 2012. 212 p. (In Russ.).

[8] Sotova E.S., Vereshchaka A.A., Vereshchaka A.S. Keramicheskie rezhushchie instrumenty [Ceramic cutting tools]. Moscow, Izd-vo MGTU STANKIN Publ., 2013. 148 p. (In Russ.).

[9] Grigoriev S., Vereschaka A., Milovich F. et al. Investigation of multicomponent nanolayer coatings based on nitrides of Cr, Mo, Zr, Nb, and Al. Surf. Coat. Technol., 2020, vol. 401, art. 126258, doi: https://doi.org/10.1016/j.surfcoat.2020.126258

[10] Vereschaka A.A., Grigoriev S.N., Naumov A.G. et al. Nanoscale multilayered composite coating—applications for ecomachining. In: Handbook of modern coating technologies. Elsevier, 2021, pp. 377–423, doi: https://doi.org/10.1016/B978-0-444-63237-1.00011-5

[11] Vereschaka A.A., Grigoriev S.N., Sitnikov N.N. et al. Delamination and longitudinal cracking in multi-layered composite nano-structured coatings and their influence on cutting tool life. Wear, 2017, vol. 390–391, pp. 209–219, doi: https://doi.org/10.1016/j.wear.2017.07.021

[12] Vereshchaka A.S., Dachaeva A.V., Anikeev A.I. Working capacity enhancement of cutting tools in terms of machining of difficult-to-cut materials by complex application of wear-resistant coating and hard alloy. Izvestiya MGTU MAMI, 2010, no. 1, pp. 99–106. (In Russ.).

[13] Tabakov V.P., Chikhranov A.V. Increase of serviceability of hard-alloy tools by directed selection of rational parameters of wear-resistant coating composition. STIN, 2016, no. 3, pp. 14–18. (In Russ.).

[14] Artamonov E.V., Vasilyev D.I., Voronin V.V. Rapid diagnostic test of metal turning using vibration parameters analysis. Izvestiya Yugo-Zapadnogo gosudarstvennogo universiteta [Proceedings of the Southwest State University], 2020, no. 4, pp. 18–28, doi: https://doi.org/10.21869/2223-1560-2020-24-4-18-28 (in Russ.).

[15] Zaydes S.A., Kho M.K. Evaluation of thermal fields influence upon the components’ stressed deformed state in pendulum surface plastic deformation. Stal, 2022, no. 9, pp. 32–36. (In Russ.).

[16] Kuts V.V., Tolmacheva T.A. Experimental study of the roughness of the treated surface during vortex boring. Izvestiya TulGU. Tekhnicheskie nauki [News of the Tula State University. Technical Sciences], 2023, no. 4, pp. 495–501. (In Russ.).