Actual Problems in Machine Building 2016 No. 3

Актуальные проблемы в машиностроении. 2016. №3 Технологическое оборудование, оснастка и инструменты ____________________________________________________________________ 323 CALCULATION OF STRENGTH OF CUTTING INSERTS IN TITANIUM ALLOY MACHINING Kozlov V.N. , Ph.D. (Engineering), Associated professor, e-mail: kozlov-viktor@bk.ru Huang Z ., Master’s Degree student, e-mail: hzd817@163.com Zhang J ., Master’s Degree student, e-mail: 965075948@qq.com Letshiner E.G ., Senior Teacher, e-mail: letshiner@bk.ru National Research Tomsk Polytechnic University, 30 Lenina Avenue, Tomsk, 634050, Russian Federation Abstract Stressed state of cutting wedge in machining titanium alloy (Ti6Al2Mo2Cr) is considered. Distribution of contact loads on a face of a cutting tool was obtained experimentally with the use of a “split cutting tool”. Calculation of internal stresses in indexable insert made from cemented carbide (WC8Co) was carried out with the help of ANSYS 14.0 software. It is shown that small thickness of a cutting insert leads to extremely high compressive stresses near the cutting edge, stresses that exceed ultimate compressive strength of cemented carbide. Face and base of the insert experience high tensile stresses, which approach to ultimate tensile strength of cemented carbide and increase probability of cutting insert destruction. If thickness of the cutting insert is bigger than 5 mm, compressive stresses near the cutting edge decrease, and tensile stresses on the face and base decrease to zero. Dependences of the greatest normal and tangential stresses on thickness of a cutting insert were found. Keywords strength of cutting tool, stresses, tool wear, tool flank, machining of titanium alloys