The effect of composite boring bars on vibration in machining process

Ghorbani, Siamak; Rogov, V. A.; Carluccio, Antonio; Belov, P. S.

doi:10.1007/s00170-019-04298-6

Cited by 29 publications

(16 citation statements)

References 43 publications

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“…In following research projects, the maximum load on CFRP-boring bars has to be analysed to evaluate the process limits for industrial applications. In order to improve damping qualities, proven effects of structural and technological parameters of CFRP material on machining should be investigated [41]. Moreover, the variation of bore diameter and boring length should be analysed in future tests.…”

Section: Discussionmentioning

confidence: 99%

Investigation into deep hole drilling of austenitic steel with advanced tool solutions

Felinks

Rinschede

Biermann

et al. 2021

Int J Adv Manuf Technol

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Deep hole drilling processes for high-alloyed materials are characterised by worn guide pads and chatter vibrations. In order to increase feed rates, process stability and bore quality in STS deep hole drilling, various investigations were carried out with adjustments to the tool. First, a new process chain for the production of tribologically optimised guide pads and their effects on the guide pad shape is described in detail. The results of these studies show that the shape change in the area of the axial run-in chamfer through a micro finishing process leads to a better bore hole quality. Furthermore, the influence of guide pad coating and cooling lubricant on the deep hole drilling process was investigated. In addition, the machining of the austenitic steel AISI 304 is analysed by using a conventional steel boring bar and an innovative carbon fibre reinforced plastic (CFRP)-boring bar. While the conventional drill tube oscillates with different eigenfrequencies, the CFRP-boring bar damps chatter vibrations of the drill head and stabilises the process. Even at higher feed rates up to f = 0.3 mm, it is possible to machine austenitic, difficult-to-cut-materials with significantly reduced vibrations.

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Section: Discussionmentioning

confidence: 99%

Investigation into deep hole drilling of austenitic steel with advanced tool solutions

Felinks

Rinschede

Biermann

et al. 2021

Int J Adv Manuf Technol

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show abstract

“…Chatter vibration elimination during deep hole boring using slender bars was considered in [ 11 , 12 ]. Composite material may have much higher stiffness and damping in comparison to metal, and tests of such properties for chatter suppression were investigated in [ 13 , 14 , 15 , 16 ]. The design and testing of a new dynamic system for boring, based on a tuned holder that increases the dynamic stiffness of slender boring bars by matching the holder natural frequency to the clamped-free boring bar natural frequency, reduced susceptibility to chatter [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

An Improved Method of Minimizing Tool Vibration during Boring Holes in Large-Size Structures

et al. 2021

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The paper presents a thoroughly modified method of solving the problem of vibration suppression when boring large-diameter holes in large-size workpieces. A new approach of adjusting the rotational speed of a boring tool is proposed which concerns the selection of the spindle speed in accordance with the results of the simulation of the cutting process. This streamlined method focuses on phenomenological aspects and involves the identification of a Finite Element Model (FEM) of a rotating boring tool only and validating it with a real object, while dispensing with discrete modelling of a completely rigid workpiece. In addition, vibrations in the boring process in all directions were observed, which implies a geometric nonlinearity of the process model. During the simulation, the values of the Root Mean Square (RMS) of the time plots and the dominant values of the “peaks” in the displacement amplitude spectra were obtained. The effectiveness of the method was demonstrated using a selected mechatronic design technique called Experiment-Aided Virtual Prototyping (E-AVP). It was successfully verified by measuring the roughness of the indicated zone of the workpiece surface. The economic profitability of implementing the method in the production practice of enterprises dealing with mechanical processing is also demonstrated.

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“…Further, Hwang and Kim [25] reported that boring bar made with two or more material increases the stiffness and results in reduced vibrations during the boring process. Suzuki et al [26] and Ghorbani et al [27] developed an anisotropic and a composite boring bar, respectively, to attenuate chatter and observed improved stability with the proposed boring tool compared to the standard cutting tool. Fu et al [28] have used carbon-based nanocomposite coatings on boring bars to improve the dynamic stiffness and observed an improvement in the surface finish with the reduced vibration.…”

Section: Introductionmentioning

confidence: 99%

Investigation of stability in internal turning using a boring bar with a passive constrained layer damping

Yuvaraju¹,

Nanda²,

Srinivas³

2021

FME Transactions

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The vibrations produced in a boring tool in internal turning deteriorate the machined surface quality and reduce the tool life, which results in a massive noise during the machining. Therefore, unwanted vibrations are necessary to be eliminated by improving the boring bar's dynamic stiffness and damping capacity. This paper investigates a passive constrained layer damping (CLD) boring bar with a hybrid damping layer to study the internal turning system's stability. Initially, the dynamic models of the conventional and CLD tools are thoroughly studied using Euler-Bernoulli beam theory (EBT) and validated them with finite element modelling (FEM). The frequency response functions (FRFs) obtained from the impact hammer tests are used to estimate the modal parameters. With modal parameters, the semi-analytical stability lobe diagrams (SLDs) are plotted for the boring system with the conventional and CLD boring bar. Tool-tip responses for various cutting conditions are simulated numerically to validate and to study stability. The cutting experiments with traditional and CLD boring bar are conducted for stability analysis and compared tool-tip responses with numerical results. It is observed that both the numerical and experimental results agree with the selected cutting conditions from SLDs. It is also observed that the CLD boring bar with a hybrid damping layer reduced the vibration displacements by five times compared to the conventional one.

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The effect of composite boring bars on vibration in machining process

Cited by 29 publications

References 43 publications

Investigation into deep hole drilling of austenitic steel with advanced tool solutions

Investigation into deep hole drilling of austenitic steel with advanced tool solutions

An Improved Method of Minimizing Tool Vibration during Boring Holes in Large-Size Structures

Investigation of stability in internal turning using a boring bar with a passive constrained layer damping

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