Simulation and analytical studies of chip formation processes in the cutting zone of titanium alloys
Received: June 22, 2023
Revised: February 02, 2023
Accepted: February 09, 2023

V. Stupnytskyy, X. She, E. Dragašius, S. Baskutis, O. Prodanchuk, "Simulation and analytical studies of chip formation processes in the cutting zone of titanium alloys", Ukrainian Journal of Mechanical Engineering and Materials Science, vol. 9, no. 1, pp. 1-16, 2023.

Lviv Polytechnic National University
Lviv Polytechnic National University
Faculty Mechanical Engineering and Design
Faculty Mechanical Engineering and Design
Lviv Polytechnic National University

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.
[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
[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
[5] J. P. Davim, Machining of Titanium Alloys, Materials Forming, Machining and Tribology. London: Springer, 2014.
[6] J. P. Davim, (Ed.), Machining of hard materials. London: Springer Science & Business Media, 2011
[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
[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
[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
[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
[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
[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
[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
[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
[15] V. P. Astakhov and J. C. Quteiro, "Metal cutting mechanics, finite element modelling", Machining, Springer, London, pp. 1-27, 2008
[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
[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
[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.
[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.
[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
[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
[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
[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
[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