Abstract
This study aimed to evaluate the effect of vc on the hardening of chips formed during the deep drilling process in VTM-PLUS tool steel, in the annealed state. The deep drilling was carried out with gun drills having straight channels, internal coolant, high speed steel shank, carbide tip and 7.8 mm diameter, with the ratio L/D = 26. The vc of 60 and 70 m/min were analyzed. To evaluate the influence of cutting speed on the hardening of the chips they were analyzed via microscopy and Vickers hardness test. From the results obtained, it was observed that the formed chips were are segmented for both speeds and that the increase in the cutting speed caused an increase in its hardness. Hardness values increased in the condition of vc = 70 m/min (321 ± 18 HV) when compared to the annealed condition (223 ± 3 HV). For the condition vc = 60m/min there was also an increase in hardness values (309 ± 12 HV), although smaller, when compared to those of higher cutting speed. With the results obtained, it was possible to conclude that the increase in the deformation rate, imposed by the higher cutting speed, led to an increase in the hardness values due to the increase in work hardening.
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Acknowledgments
The authors would like to thank FUNDEP (Foundation for Research Development) for financial support to the project “Nationalization of tool steel dies for hot stamping parts for the automotive segment”, through the ROTA 2030 Program – Line IV. The authors also thank the companies Blaser, Iscar, TecnoHow and Villares Metals for providing the materials and infrastructure to carry out the experiments.
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Ricci, V.P., Rodrigues, P.H.S., Xavier, G.L.A., Hassui, A., Ventura, C.E.H. (2024). Influence of Cutting Speed on Chip Formation and Hardening in the Deep-Hole Drilling Process of VTM-PLUS Tool Steel. In: de Oliveira, D., Ziberov, M., Rocha Machado, A. (eds) ABCM Series on Mechanical Sciences and Engineering. COBEF 2023. Lecture Notes in Mechanical Engineering(). Springer, Cham. https://doi.org/10.1007/978-3-031-43555-3_9
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