OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 5 4 3 Methods Based on the study of the geometric and operational drill parameters, a CAD system for a wide range of designs was developed. The CAD algorithm includes design methods for both standard designs and advanced ones with a toroidal flank surface, separated into two different subsystems. The initial parameters for drill design are shown in table 1. Ta b l e 1 Initial parameters for drill design Parameter identifier Parameter name R Drill radius ds Сore diameter α Clearance angle γ Rake angle b Wedge angle γk Flute profile rake angle ω Helix angle Rt Radius of the generatrix of the toroidal flank surface φ Point angle κ Displacement of the generatrix of the toroidal flank surface relative to the drill axis η The angle between the point of tangency of the circle defining the toroidal generatrix and the point of intersection of the circle with the periphery L Drill length lr Drill body f Margin ν The value that specifies the point of contact of the toroidal generatrix relative to the drill axis r Radius of the back profile of the helical flute of the drill rp The radius of the circle that specifies the control section that determines the values of the drill clearance angle Rmin Minimum radius of the toroidal flank surface of the drill lt The length of the main cutting edge at the reference point, measured from the starting position. The initial position of the edge is set at the intersection point of the main and transverse cutting edges l Total length of main cutting edge Automated design of twist drills is based on initial data that determines a set of technological, physical, mechanical and operational indicators and its relationships with construction feature as the basis of the design methodology. Automated design of drills is carried out via a sequential methodology based on the impact of the most important elements and restrictions on the development of detailed engineering drawings. The creation of such a system plays an important role in the development of cutting tools and industrial R&D, which can greatly improve the efficiency of drill design and its quality, help designers of various scientific fields to use efficient technologies and methods to develop innovative design schemes greatly
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