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Article


Title

Improvement of the Dynamic Quality of Cantilever Boring Bars for Fine Boring

Authors

[ 1 ] Instytut Technologii Materiałów, Wydział Inżynierii Mechanicznej, Politechnika Poznańska | [ P ] employee

Scientific discipline (Law 2.0)

[2.8] Mechanical engineering

Year of publication

2023

Published in

Machines

Journal year: 2023 | Journal volume: vol. 11 | Journal number: iss. 1

Article type

scientific article

Publication language

english

Keywords
EN
  • dynamic damper
  • parametric vibrations
  • process innovation
  • frequency
  • amplitude
  • resonance
Abstract

EN The paper presents ways to reduce the vibrations of special cantilever boring bars mounted on spindle heads of finishing and boring machines. Special cantilever boring bars are designed for machining holes in non-standard conditions, for example, when boring deep holes with l/d>3 (l–hole length, d-hole diameter) or holes with a discontinuous surface. The results of the experiments and theoretical developments, as well as the schemes of the experimental stands, are presented. The investigated methods for reducing fluctuations are the following: the use of a dynamic damper with intermittent cutting elements; the suppression of the normal vibrations of the cutter to the workpiece surface due to the excitation of vibrations directed tangentially to the workpiece surface and not causing processing errors; increased damping in the cutting zone when changing the design of the boring bar. The tuning parameters of the dynamic damper, the logarithmic decrement of vibrations, as well as the conditions for effective damping of vibrations during the interaction of their two coupled forms are given. The results are shown in the tables and graphs.

Date of online publication

21.12.2022

Pages (from - to)

7-1 - 7-15

DOI

10.3390/machines11010007

URL

https://www.mdpi.com/2075-1702/11/1/7

Comments

Article Number: 7

License type

CC BY (attribution alone)

Open Access Mode

open journal

Open Access Text Version

final published version

Date of Open Access to the publication

in press

Ministry points / journal

20.0

Impact Factor

2.899 [List 2021]

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