OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 5 No. 4 2023 improving the efficiency of design and product development. To improve the efficiency of technological innovations, the key parameters such as rake angle changes and internal equivalent stresses in the cutting wedge of the drill, were analyzed in the first instance. In order to accomplish this task, certain restrictions were imposed on the design results in the form of recommended ranges and reference values of the key parameters. Analysis of the relationships between structural elements and geometric parameters of a twist drill with a toroidal flank surface was carried out with accounting for the workpiece and tool material, cutting conditions and interdependent design components. Since no formalized dependencies in analytical, numerical and algorithmic form between the parameters of the technological environment and the parameters of the drill exist at the present time, a comprehensive methodology for designing drills with a toroidal flank surface is proposed in this work for the first time. The comprehensive CAD methodology for the design of twist drills is based on classical approaches to drill design and is divided into sub-elements of modeling (fig. 1). The first design block includes a structural base of initial data in accordance with GOST 17275-71 (R, ds, α, γk, ω, Rt, φ, κ, η, L, lr, f, ν). Fig. 1. Complex CAD block schematic diagram of twist drills Depending on the shape of the cutting edge, the design methodology includes two groups of cutting edge designs. The system generates conditions for searching for a rational flute shape to form a straight cutting edge of a drill with a conical cutting surface [7] (fig. 2). The definition of the helical projection of the cutting edge is described by the following equation: 2 2 tan Pr cos tan( ) tx ty y ty B RK RK RK Dd + Ξ + Ξ = - Ξ + ω π 2 2 2 2 tan( ) sin ; tan( ) tx ty tx tx ty B RK RK RK RK RK + ϕ Ξ + Ξ + Ξ ω π Ξ + Ξ (1)
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