OBRABOTKAMETALLOV Vol. 23 No. 3 2021 MATERIAL SCIENCE EQUIPMENT. INSTRUMENTS 5 4 3 Fig. 2. Defining the profile of the spiral flute (1) and the profile element of flute on the rake surface (2) 2 2 2 2 tan( ) Pr cos tan( ) tx ty x tx tx ty B f RK RK RK RK RK + Ξ + Ξ = - Ξ - ω π Ξ + Ξ 2 2 2 2 tan( ) sin . tan( ) tx ty ty tx ty B f RK RK RK RK RK + Ξ + Ξ - Ξ ω π Ξ + Ξ (2) The next stage of the design methodology consists of a modeling of the spiral flute and its corresponding cutting surface. Depending on the diameter of the drill, the shape of the flank surface is assigned and a Boolean operation is formed that defines the flank surface, while maintaining the shape of the cutting edge and the specified geometric parameters in the control sections (α, γk, ω, φ, κ, ν). This design stage generates design documentation for traditional types of twist drill designs. In this work, a new technique for CAD design of drills with a toroidal flank surface is proposed for the first time. The block schematic diagram of this technique and its detailed view are shown in fig. 3 in Fig. 3. CAD block schematic diagram of twist drills with toroidal flank surface
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