Deryabin I.P., Guzeev V.I., Tokarev A.S. Experimental Studies on Technological Inheritance of Errors in the Location of the Axis of Holes when Using Three-Blade Tools

DOI: 10.18503/1995-2732-2023-21-3-114-122

Abstract

Problem Statement (Relevance). Modern mechanical engineering is characterized by a constant tightening of requirements for accuracy of parts. One of the problems of achieving high accuracy of the axis of the holes in various parts is technological inheritance of errors during multi-transition processing. Hole machining on modern CNC machines by drilling, countersinking and broaching is carried out with a rigid attachment of the tool and without direction along a jig bushing. When applying multi-pass hole machining, the deviation occurred after drilling is to be corrected at the following stages. However, drilling, countersinking, etc. unstably provides an increase in accuracy of the location of the axis of the hole. The results of these stages are unstable; in some cases the deviation is not decreased, but increased. This is largely due to the main specifics of hole machining with end measuring tools (drills, countersinks, reamers), namely extremely low rigidity, which is almost impossible to increase on modern high-precision CNC equipment. Therefore, it is necessary to find other ways to reduce machining errors: the choice of geometric parameters of sharpening tools, factoring into the amplitude and phase of axial vibrations of the tool, etc. Objectives. The study is aimed at determining experimentally the influence of various machining process parameters on inheritance of the deviation of the hole axis for drilling and countersinking with a three-blade countersink. Methods Applied. We developed a method of conducting experiments with varying the angles of tool sharpening, the amplitude and phase of the axial vibrations of the tool, the azimuthal position of the workpiece in the machine. Originality. Certain combinations of controlled machining parameters have been found to provide that a dissymmetrically sharpened tool along the entering angle reduces the deviation of the hole axis significantly more than a symmetrically sharpened one. Result. It is possible to control the parameters of hole machining with end measuring tools to achieve a significant impact on technological inheritance of axis location errors. Practical Relevance. The application of the research results will improve accuracy of hole machining with end measuring tools on CNC machines.

Keywords

hole machining, technological inheritance, removal of the axis of the holes, end measuring tools, axial vibrations of the tool

For citation

Deryabin I.P., Guzeev V.I., Tokarev A.S. Experimental Studies on Technological Inheritance of Errors in the Location of the Axis of Holes when Using Three-Blade Tools. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2023, vol. 21, no. 3, pp. 114-122. https://doi.org/10.18503/1995-2732-2023-21-3-114-122

Igor P. Deryabin – DrSc (Eng.), Professor, South Ural State University, Chelyabinsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Viktor I. Guzeev – DrSc (Eng.), Professor, Head of the Department of Automated Mechanical Engineering Technologies, South Ural State University, Chelyabinsk, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

Artem S. Tokarev – PhD (Eng.), Senior Lecturer, Trekhgorny Technological Institute – Branch of National Research Nuclear University Moscow Engineering Physics Institute, Trekhgorny, Russia. Email: This email address is being protected from spambots. You need JavaScript enabled to view it..

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