Designing the structures of discrete solid­alloy elements for broaching the holes of significant diameter based on the assessment of their strength

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.203524

Keywords:

deforming broaching, stressed state, solid alloy, discrete deforming element, element strength

Abstract

This paper addresses the issues related to designing and estimating the strength of solid-alloy elements in the deforming broaches of significant diameter (exceeding 150 mm) for the developed process of discrete broaching. The tool limit condition was assessed based on two strength criteria: the specific potential energy of shape change and the maximum tangent stresses. Numerical modeling using the finite element method has made it possible to derive the distribution of equivalent stresses in the tool elements and the contact stresses at the surface of the contact between a solid-alloy insert and the body, which enabled the analysis of tool strength under loading. The simulation was performed under a single normal load, which ensured the versatility of the calculation for any contact pressure values. We have derived formulae to calculate the acceptable contact pressure depending on unit load. The effect of the insert protrusion height over the body on the strength of tool elements has been established. We have derived engineering dependences that determine the required magnitude of insert protrusion over the body depending on the ultimate load. An example of calculating the strength of a prefabricated deforming element in the machining of a sleeve made from gray modified cast iron of hardness HB230 has been considered. Our calculations have shown that the deforming element designed for the new technological process corresponds to the conditions of strength, provided the ratio h1/h=0.15 is maintained (where h1 is the insert height above the body, h is the insert height). The results obtained could be used in engineering calculations when designing the prefabricated tool for discrete deformation, as well as to assess the strength of prefabricated tools, such as cutters, core drills, reamers, when refining external loads

Author Biographies

Yakiv Nemyrovskyi, Central Ukrainian National Technical University Universytetskyi ave., 8, Kropyvnytskyi, Ukraine, 25006

Doctor of Technical Sciences

Department of Ecology and Environment Protection

Ihor Shepelenko, Central Ukrainian National Technical University Universytetskyi ave., 8, Kropyvnytskyi, Ukraine, 25006

PhD, Associate Professor

Department of Exploitation and Repairing Machines

Eduard Posviatenko, National Transport University Mykhailа Omelianovycha-Pavlenka str., 1, Kyiv, Ukraine, 01010

Doctor of Technical Sciences, Professor

Department of Repair and Materials

Yuri Tsekhanov, Voronezh State Technical University 20 let Oktyabrya str., 84, Voronezh, Russia, 394026

Doctor of Technical Sciences, Professor

Department of Engineering and Computer Graphics

Sergiy Polotnyak, V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine Avtozavodska str., 2, Kyiv, Ukraine, 04074

PhD, Senior Researcher

Department of Physical and Mechanical Research and Nanotesting of Materials

Sergii Sardak, Dniprovskii University of the Humanities Yermolova str., 35, Dnipro, Ukraine, 49033

Doctor of Economic Sciences, Associate Professor

Department of Economics and Management of Tourism

Valentina Bandura, Vinnytsia National Agrarian University Soniachna str., 3, Vinnytsia, Ukraine, 21008

PhD, Professor

Department of Agricultural Engineering and Technical Service

Yurii Paladiichuk, Vinnytsia National Agrarian University Soniachna str., 3, Vinnytsia, Ukraine, 21008

PhD, Associate Professor

Department of Agricultural Engineering and Technical Service

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Published

2020-06-30

How to Cite

Nemyrovskyi, Y., Shepelenko, I., Posviatenko, E., Tsekhanov, Y., Polotnyak, S., Sardak, S., Bandura, V., & Paladiichuk, Y. (2020). Designing the structures of discrete solid­alloy elements for broaching the holes of significant diameter based on the assessment of their strength. Eastern-European Journal of Enterprise Technologies, 3(7 (105), 57–65. https://doi.org/10.15587/1729-4061.2020.203524

Issue

Vol. 3 No. 7 (105) (2020): Applied mechanics

Section

Applied mechanics

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Copyright (c) 2020 Yakiv Nemyrovskyi, Ihor Shepelenko, Eduard Posviatenko, Yuri Tsekhanov, Sergiy Polotnyak, Sergii Sardak

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