FEATURES OF TRANSFORMATION OF THE CUTTING ANGLE OF THE DRILLING TOOL DEPENDING ON THE POSITION OF ITS BLADE

UDC 674.055:621.95.04

  • Mashoripova Tatiana Aleksandrovna − PhD student, the Department of Woodworking Machines and Tools. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: t.a.mashoripova@mail.ru

  • Grishkevich Aleksandr Aleksandrovich − − PhD (Engineering), Associate Professor, Head of the Department of Woodworking Machines and Tools. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail: dosy@belstu.by

DOI: https://doi.org/10.52065/2519-402X-2021-246-42-327–332

Key words: design, improvement, cutting angle, drilling, drill.

For citation: Mashoripova T. A., Grishkevich A. A. Features of transformation of the cutting angle of the drilling tool depending on the position of its blade. Proceedings of BSTU, issue 1, Forestry. Nature Management. Processing of Renewable Resources, 2021, no. 2 (246), pp. 327–332 (In Russian).DOI: https://doi.org/10.52065/2519-402X-2021-246-42-327–332.

Abstract

The article describes a theoretical study of the influence of the angle of inclination of the blade to the axis of the screw drill on the cutting angle. In this paper, the dependence of the value of the cutting angle δ on the angle of inclination of the helical groove ε is established. As the angle of inclination of the screw groove increases, the cutting angle decreases.

The design of the drill is determined by its technological purpose: the type of material to be processed, the direction of drilling relative to the wood fibers or the planes of the wood plate (in the layer or edge), and more. This is due to the formation and removal of chips, force and temperature stresses, which, in turn, depend on the cutting angle δ and the angle of inclination of the helical groove ε.

The cutting angles, in this paper, are considered in the plane of motion, in this case in the plane normal to the cutting edge, therefore, depending on the angle of inclination of the cutting edge to the drill axis, the cutting angles will have different values that do not coincide with the contour ones (except for the case for ∠ = ε 90 ). In addition, due to the location of the groove of the corresponding profile along the helix, the cutting angles acquire different values along the length of the cutting edge.

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