Effect of the stiffness characteristics of the stuffing box on boring bar vibrations

Gessesse, Y. B.; Latinovic, V.

doi:10.1080/00207549108930089

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…They may also be interpreted as resonance effects at constant eigenfrequencies. The x-shaped pattern in the spectrogram from sensor B, on the other hand, closely resembles the patterns of changing bending-eigenfrequencies which were calculated for BTA deep hole drilling by Gessesse et al [6,7].…”

Section: Methodsmentioning

confidence: 98%

“…For drilling without a Lanchester-damper, Gessesse et al [6,7] modeled the time varying structural dynamics of the components relevant for the drilling process using a finite element model. During drilling tests they observed the reproducible occurrence of spiralling when the slowly varying bending eigenfrequencies of the tool intersect with uneven multiples of the rotational frequency of the tool-or workpiece-spindle.…”

Section: Introductionmentioning

confidence: 99%

“…In absence of a better explanation, random occurrence is mainly attributed to work piece inhomogeneities. One reason for the reproducible occurrence of spiralling is excessive guide pad wear [6,8] which caused the defective workpiece shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

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Varying bending eigenfrequencies in BTA deep hole drilling: mechanical modeling using statistical parameter estimation

Weinert¹,

Weihs

Webber³

et al. 2007

Prod. Eng. Res. Devel.

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One serious problem in deep-hole drilling is the formation of a dynamic disturbance called spiralling which causes a multi-lobe shaped distortion of the bore hole cross section. An important factor governing the occurrence of spiralling is the coincidence of a bending eigenfrequency of the boring tool with a multiple of the spindle rotation frequency. This article presents a discrete dynamic model of the tool/boring-bar assembly including a Lanchesterdamper and containing free parameters for the unknown stiffness of the tools lateral supports. Furthermore, a method for estimating these parameters by determining the changing eigenfrequencies over the drilling depth from spectrogram data using the maximum likelihood method is proposed.

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Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Varying bending eigenfrequencies in BTA deep hole drilling: mechanical modeling using statistical parameter estimation

Weinert¹,

Weihs

Webber³

et al. 2007

Prod. Eng. Res. Devel.

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show abstract

“…Due to the constant varying drilling depth, it leads to shifts of the eigenfrequencies caused by the changing support situation. This subject has also been elaborated by Gessesse et al [10] and Webber [30]. Efforts in terms of modelling the STS/BTA process and its vibration instabilities were conducted by Al Wedyan [31], Chin et al [12], Matsuzaki [8] and Raabe [25].…”

Section: Chatter Vibrationsmentioning

confidence: 99%

“…Such modelled systems depend on functions of the chip thickness, width of cut, material properties, the cutting insert vibration at the current time (t) and one tooth period earlier (t-) [7]. Additional influences, especially in deep drilling, are the tool head geometry [8], the drilling depth, which leads to a shift in the natural frequency of the boring bar-tool head assembly [9], the stiffness and guidance of the stuffing box [10] and Lanchester dampers and the own weight of the boring bar. Several studies investigated the dynamic behaviour of deep drilling for STS/BTA and gun drilling applications.…”

Section: Dynamics Of Drillingmentioning

confidence: 99%

In-Process Monitoring and Analysis of Dynamic Disturbances in Boring and Trepanning Association (Bta) Deep Drilling

Steininger

Bleicher

2018

Journal of Machine Engineering

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This paper presents an approach to monitor the dynamic disturbances of a BTA (boring and trepanning association) deep drilling system. High length to diameter ratios are the key characteristic of deep drilling processes compared to conventional drilling applications. Since length to diameter ratios of up to 150 for slender tool-boring-bar assemblies are common, the deep drilling process is sensitive to dynamic disturbances such as chatter and whirling vibrations. Whirling vibrations usually effect the shape of the hole and cause holes with several lobes. To gain a deeper understanding of the dynamic state of the process, a sensor application has been developed and was tested in practice. Experimental investigations on BTA deep drilling with continuous multi-sensory monitoring were conducted. The used setup allowed the determination of the frequencies of chatter and whirling vibrations during the cutting process by analysing the logged data using a continuous short-time Fourier transformation (STFT).

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Deep hole drilling

et al. 2018

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Effect of the stiffness characteristics of the stuffing box on boring bar vibrations

Cited by 5 publications

References 1 publication

Varying bending eigenfrequencies in BTA deep hole drilling: mechanical modeling using statistical parameter estimation

Varying bending eigenfrequencies in BTA deep hole drilling: mechanical modeling using statistical parameter estimation

In-Process Monitoring and Analysis of Dynamic Disturbances in Boring and Trepanning Association (Bta) Deep Drilling

Deep hole drilling

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