The low machinability of titanium alloys is determined by the physical, mechanical, and chemical properties of these materials and their mechanical characteristics. It is also evident in the hardened state of the material being processed during cutting and in the initial state. This phenomenon is caused by thermodynamic parameters that determine the properties of titanium material at elevated temperatures. The peculiarities of the cutting and chip formation processes during titanium alloy machining are presented in this article. The peculiarity of the described approach is the analysis of the results of simulation modeling of cutting in Deform 2D software. It is proved that the frictional factor in the formation of the thermal characteristics of the cutting process, which arises as a result of the chip sliding along the tool, dominates the load factor (caused by force and deformation processes in the chip root). It has been established that the length of contact between the chips and the tool’s rake face has a certain tendency to change: the contact length first increases and then decreases with increasing cutting speed. An analysis of the dependence of the chip compression ratio on changes in cutting speed has shown that with an increase in cutting speed, the average value of the compression ratio practically does not change, but the amplitude of its oscillation increases significantly, which is equivalent to a change in the shear angle. This parameter changes dynamically due to the adiabatic nature of chip formation
[1] V. P. Astakhov, Metal cutting mechanics, Boca Raton: CRC Press, 1998.
https://doi.org/10.1201/9781466571778
[2] F. V. Novikov and E. Y. Benin, "Determination of conditions ensuring cost price reduction of machinery", Economics of Development, vol. 3, no 63, pp. 69-74, 2012.
[3] J. P. Davim and V. P. Astakhov, "Tribology of Metal Cutting", International Journal of Machining and Machinability of Materials, vol.5, no.2/3, pp. 367 - 368, 2009
https://doi.org/10.1504/IJMMM.2009.023400
[4] D. Ulutan and T. Ozel, "Machining induced surface integrity in titanium and nickel alloys: A review", International Journal of Machine Tools and Manufacture, vol.51, no. 3, pp. 250-280, 2011
https://doi.org/10.1016/j.ijmachtools.2010.11.003
[5] J. P. Davim, Machining of Titanium Alloys, Materials Forming, Machining and Tribology. London: Springer, 2014.
https://doi.org/10.1007/978-3-662-43902-9
[6] J. P. Davim, (Ed.), Machining of hard materials. London: Springer Science & Business Media, 2011
https://doi.org/10.1007/978-1-84996-450-0
[7] V. Stupnytskyy and I. Hrytsay, "Simulation Study of Cutting-Induced Residual Stress", Advances in Design, Simulation and Manufacturing. DSMIE-2019. Lecture Notes in Mechanical Engineering, vol. 1, pp. 341-350, 2020
https://doi.org/10.1007/978-3-030-22365-6_34
[8] W. J. Xu, X. M. Zhang, J. Leopold and H. Ding, "Mechanism of serrated chip formation in cutting process using digital image correlation technique", Procedia CIRP, vol. 58, 146-151, 2017
https://doi.org/10.1016/j.procir.2017.03.207
[9] G. G. Ye, Y. Chen, S. F. Xue and L. H. Dai, "Critical cutting speed for onset of serrated chip flow in high speed machining", International Journal of Machine Tools and Manufacture, vol. 86, pp. 18-33, 2014
https://doi.org/10.1016/j.ijmachtools.2014.06.006
[10] A. Devotta, T. Beno, R. Siriki, R. Löf, and M. Eynian, "Finite element modeling and validation of chip segmentation in machining of AISI 1045 steel", Procedia Cirp, vol. 58, pp. 499-504, 2017
https://doi.org/10.1016/j.procir.2017.03.259
[11] L. Wen, C. Q. Yang, Q. L. Niu, W. W. Ming and M. Chen, "Experimental Study on the Formation Mechanism of Serrated Chip of TC11 Titanium Alloy", Key Engineering Materials, vol. 693, pp. 767-774, 2016
https://doi.org/10.4028/www.scientific.net/KEM.693.767
[12] X. Zhu, J. Shi, Y. Liu, Y. Jiang, B. Zhou and X. Zhao, "Study on Formation Mechanism of Serrated Chip of Ti-6Al-4V Titanium Alloy Based on Shear Slip Theory" The International Journal of Advanced Manufacturing Technology, Preprint, 2022
https://doi.org/10.21203/rs.3.rs-1436539/v1
[13] M. Rahman, Z. G. Wang and Y. S. Wong, "A review on high-speed machining of titanium alloys". JSME International Journal Series C, Mechanical Systems, Machine Elements and Manufacturing, vol.49, no. 1, pp. 11-20, 2006
https://doi.org/10.1299/jsmec.49.11
[14] M. Calamaz, D. Coupard, M. Nouari, and F. Girot, "Numerical analysis of chip formation and shear localisation processes in machining the Ti-6Al-4V titanium alloy" The International Journal of Advanced Manufacturing Technology, vol. 52, no. 9, pp. 887-895, 2011
https://doi.org/10.1007/s00170-010-2789-x
[15] V. P. Astakhov and J. C. Quteiro, "Metal cutting mechanics, finite element modelling", Machining, Springer, London, pp. 1-27, 2008
https://doi.org/10.1007/978-1-84800-213-5_1
[16] E. García-Martínez, V. Miguel, A. Martínez-Martínez, M. C. Manjabacas and J. Coello, "Sustainable lubrication methods for the machining of titanium alloys: An overview", Materials, vol. 12, no. 23, 3852, 2019
https://doi.org/10.3390/ma12233852
[17] A. Pramanik, "Problems and solutions in machining of titanium alloys", The International Journal of Advanced Manufacturing Technology, vol. 70, no. 5, pp. 919-928, 2014
https://doi.org/10.1007/s00170-013-5326-x
[18] O. Hatt, P. Crawforth, and M. Jackson, "On the mechanism of tool crater wear during titanium alloy machining", Wear, vol. 374, pp. 15-20.
https://doi.org/10.1016/j.wear.2016.12.036
[19] J. Perry, (Ed.). Titanium Alloys: Types, Properties, and Research Insights. Nova Science Publishers, NY, 2017
[20] S. A. Niknam, R. Khettabi, and V. Songmene, "Machinability and machining of titanium alloys: a review". In book: Machining of Titanium Alloys: Chapter 1, Springer-Verlag, Berlin-Heidelberg, 2014.
https://doi.org/10.1007/978-3-662-43902-9_1
[21] V. Stupnytskyy and S. Xianning, "Comparative Analysis of Simulation Results of Hard-to-Cut Materials Machining by Coated Cutting Tools", Journal of Mechanical Engineering-Strojnícky časopis, vol. 70, no. 2, pp. 153-166, 2020
https://doi.org/10.2478/scjme-2020-0028
[22] S. K.Shihab, Z. A. Khan, A. Mohammad and A. N Siddiquee, "A review of turning of hard steels used in bearing and automotive applications", Production & Manufacturing Research, vol. 2, no. 1, pp. 24-49, 2014
https://doi.org/10.1080/21693277.2014.881728
[23] F. Klocke, K. Arntz, G. F.Cabral, M. Stolorz and M. Busch, "Characterization of tool wear in high-speed milling of hardened powder metallurgical steels", Advances in Tribology, Special Issue "Wear Related Phenomena in Advanced Materials", 2011
https://doi.org/10.1155/2011/906481
[24] H. A., Kishawy and A. Hosseini, Machining difficult-to-cut materials. Part of the book series: Materials Forming, Machining and Tribology, London: Springer, 2019
https://doi.org/10.1007/978-3-319-95966-5
[25] M. Zadshakoyan and V. Pourmostaghimi, "Genetic equation for the prediction of tool-chip contact length in orthogonal cutting", Engineering Applications of Artificial Intelligence, vol. 26, no. 7, pp. 1725-1730, 2013
https://doi.org/10.1016/j.engappai.2012.10.016