Towards improved design of boring bars part 1: Dynamic cutting force model with continuous system analysis for the boring bar performance

Rao, P. N.; Rao, U.R.K.; Rao, J. S.

doi:10.1016/0890-6955(88)90005-3

Cited by 18 publications

(7 citation statements)

References 4 publications

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“…Despite the influence of clamping conditions of the bar on its dynamic properties [7], most authors have simplified the analysis of boring vibrations accounting just for the lower order bending modes [8]. Andren et al [9] studied boring bar chatter comparing an analytical Euler Bernoulli model with a time series approach.Both cutting force and dynamic behavior of the boring bar depend on the geometry of the cutting insert, as has been demonstrated by different authors (see for instance Rao et al [10], Kuster and Gygax [11], Lazaglu et al [12], Ozlu and Budak [13,14] and Moetakef Imani and Yussefian [15]).…”

Section: Introductionmentioning

confidence: 72%

Optimization of passive vibration absorbers to reduce chatter in boring

Rubio

Loya

Miguélez

et al. 2013

Mechanical Systems and Signal Processing

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This paper is focused on the optimal selection of the parameters of a passive dynamic vibration absorber (DVA) attached to a boring bar. The boring bar was modeled as an Euler Bernoulli cantilever beam and the stability of the system was analyzed in terms of the bar and the absorber characteristics. To obtain the optimum parameters of the absorber, a classical method for unconstrained optimization problems has been used. The selection criterion consisted of the maximization of the minimum values of the stability lobe diagram. Empirically fitted expressions for the frequency and damping ratio of the DVA (which permit to obtain its stiffness and damping) are proposed. These expressions are fully applicable when the damping ratio of the boring bar is non null as it is in practical operations. The computed results show a clear improvement in the stability performance regarding other methodologies previously used.

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Section: Introductionmentioning

confidence: 72%

Optimization of passive vibration absorbers to reduce chatter in boring

Rubio

Loya

Miguélez

et al. 2013

Mechanical Systems and Signal Processing

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“…For example, Zhang et al [5] who's model is derived from a two-degree-of-freedom model of a clamped boring bar and four cutting force components. In addition, Rao et al [6] includes variation of chip cross-sectional area in their model, whilst Kuster et al [12] developed a computer simulation based on a three-dimensional model of regenerative chatter. Walter et al [13] developed a model of the chuck-workpiece connection when the workpiece is considered to be weak, using Finite Element Method (FEM) and experimental studies of a ring shaped weak workpiece; this model focused on the influence from clamping forces when using jaw chucks.…”

Section: Henrikåkesson Tatiana Smirnova Thomas Lagö and Lars Håkanssonmentioning

confidence: 99%

“…A number of experimental studies have been carried out on mechanisms explaining tool vibration during turning operations [2,3,4] and on the dynamic properties of boring bars [5,6,7]. In 1946 the principles of the traditional theory of chatter in simple machine-tool systems were worked out by Arnold [8] based on experiments carried out on a rigid lathe, using a stiff workpiece but a flexible tool.…”

Section: Introductionmentioning

confidence: 99%

Analysis of dynamic properties of boring bars concerning different clamping conditions

Åkesson

Smirnova

Håkansson

2009

Mechanical Systems and Signal Processing

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The boring bar is one of the most widely used type of tool holders in metal cutting operations. The turning process subjects the tool to vibrations, and cutting in deep workpiece cavities is likely to result in high vibration levels. The consequences of such vibration levels generally results in: reduced tool life, poor surface finishing and disturbing sound. Internal turning frequently requires a long and slender boring bar in order to machine inside a cavity, and the vibrations generally become highly correlated with one of the fundamental bending modes of the boring bar. Different methods can be applied to reduce the vibrations, the implementation of the most efficient and stable methods require in depth knowledge concerning the dynamic properties of the tooling system. Furthermore, the interface between the boring bar and the clamping house has a significant influence on the dynamic properties of the clamped boring bar. This report focuses on the dynamic properties of a boring bar that arise under different clamping conditions of the boring bar and are introduced by a clamping house (commonly used in the manufacturing industry). The dynamic properties of a boring bar (for different cases of boundary condition of the boring bar) are presented partly analytically but also experimentally.

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“…In researches of boring process, most of the past research focused on increasing the dynamic stiffness of the boring bars, or vibration absorbers [1] [2]. Kuster presented a simulation model in predicting the vibrations in boring [3].…”

Section: Introductionmentioning

confidence: 99%

Monitoring Method of Machining Error of Long and Thin Cylinder in Boring Process

Tao

Jiang

et al. 2015

2015 2nd International Conference on Information Science and Control Engineering

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an online monitoring method of machining error of the long and thin cylinder during boring process is introduced. Machining errors usually appear as the offset of spatial location of actual cutting path compared to ideal cutting path. In order to monitor machining error of workpiece, the tool actual cutting path on workpiece in boring process was studied. The multi-body system theory and processing information obtained through built-in position sensors of CNC machine tools and external sensors were employed to establish the tool cutting path simulation model. Multiple factors affecting quality of the long and thin cylinder, such as machining distortion of workpiece, clamping error, radial rotation error of the spindle and motion error of machine tools, were took into account in this model. Finally, to verify the proposed method, a machining test has been conducted.

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Towards improved design of boring bars part 1: Dynamic cutting force model with continuous system analysis for the boring bar performance

Cited by 18 publications

References 4 publications

Optimization of passive vibration absorbers to reduce chatter in boring

Optimization of passive vibration absorbers to reduce chatter in boring

Analysis of dynamic properties of boring bars concerning different clamping conditions

Monitoring Method of Machining Error of Long and Thin Cylinder in Boring Process

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