OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 5 No. 4 2023 Ta b l e 2 Comparison of the shape of the cut layer using twist drills with different parameters of the flank surface Parameter Conical flank surface Toroidal flank surface (2.5 R) Toroidal flank surface (1.25 R) Toroidal flank surface (Rt min) Width of uncut chip on periphery t = 0.19 mm t = 0.17 mm t = 0.13 mm t = 0.04mm Diagram of uncut chip a b Fig. 7. Epure of equivalent stresses of a drill with a toroidal flank surface: a – side view; b – end view Ta b l e 3 Physical and mechanical properties of hard alloy Property Value Bending strength, MPa ≥ 1,500 Compressive resistance, MPa ≥ 4,300 Material density, g/cm3 ≥ 14.6 Hardness of material HRA ≥ 88.5 Hard alloy VK6 (WC 94 %-Co 6 %) was chosen as the material of the cutting tool, due to its effective use in processing materials in which abrasive wear predominates, such as cast iron. The physical and mechanical properties of the VK6 material for creating a material model are shown in table 3. After solving the problem, diagrams of equivalent stresses and displacements of drills with conical and toroidal sharpening of the flank surface were plotted.
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