Chatter avoidance in cutting highly flexible workpieces

Stépàn, Gábor; Kiss, Adam K.; Ghalamchi, Behnam; Sopanen, Jussi; Bachrathy, Dániel

doi:10.1016/j.cirp.2017.04.054

Cited by 51 publications

(25 citation statements)

References 18 publications

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“…Experiments can help assess the degree of self-oscillation elimination (e.g., for axial turning of the long non-rigid shaft with a length of 10 diameters accompanied by intensive self-oscillation excitation) [5]. When finish turning, the stock removal rate is less than the tip radius.…”

Section: Introductionmentioning

confidence: 99%

Self-oscillation suppression when turning non-rigid shafts using spring tools and the spring headstock center

et al. 2018

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One of the new but understudied self-oscillation elimination methods applied in metal cutting involves creation of an extra tangential oscillating circuit adjusted to resonance with the main normal circuit in the cutting zone. To assess the efficiency of the method, spring tool and driving dogs were developed. They were used in axial turning of non-rigid shafts. In comparison with standard tools fastened in the center, spring tools decrease the amplitude of self-oscillations by a mean of 90 %.

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Section: Introductionmentioning

confidence: 99%

Self-oscillation suppression when turning non-rigid shafts using spring tools and the spring headstock center

et al. 2018

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“…On the other hand, for low radial immersion, significant differences can be noticed in defined stability lobe diagrams. Stepan [12] analyses stability of turning for flexible workpiece varying dynamic properties due to the material removal process by finite element method. The Frequency Response Function is determined depending on tool position.…”

Section: State Of the Artmentioning

confidence: 99%

Comparison of different mathematical models for prediction of self-excited vibrations occurance in milling process

Košarac¹,

Mladjenovic²,

Zeljković³

et al. 2020

IJEEC

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In modern production, despite the existence of other production methods, metal cutting still plays an important role. The performance of machine tools has a decisive role in terms of productivity and quality of production increase. Undoubtedly, productivity and quality of production are two mail requirements which are key elements to stay on top in a competitive market. One of the most influencing factor that affect the machine tools are vibrations. The most unwanted vibrations that can appear during metal cutting process are self-excited vibrations, which are one of the three kinds of mechanical vibration, free vibration, forced vibration, and self-excited vibration. When it comes to improving the performance of machine tools, the analysis of the appearance of self-excited vibrations and their isolation occupy a significant place. The aim of this paper derives from trends and limitations exists in metal production. The way to isolate the self-excited vibrations is to predict their occurrence by defining the stability lobe diagram. The paper presents two popular analytical methods for identifying stability lobe diagrams in milling, which shows the boundary between stable and unstable zone of machining operations, depending on the number of revolutions of the spindle and cutting depth. First considered method is Fourier series approach and second one id average tooth angle approach. Lather, both stability lobe diagrams were compared with results obtained experimentally.

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“…The structure diagram of the laser gyro IMU assembly is shown in Figure 1. Frequency-domain analytical methods focus on the analysis and optimization of the modal and frequency response for the mechatronic systems, which have been widely used in multiple precision manufacturing fields, that is, the dynamic analysis and optimization of the high-performance machine tools [28], the design of the active vibration isolators for the precision instruments [29], and the NVH (noise, vibration, and harshness) analysis of the vehicle [30], among others. In this paper, the vibration frequency response characteristics of the laser gyro IMU are taken as the focus point, and the multi-rigid body dynamic model of IMU for the frequency response analysis is established to clearly describe the multi-DOF coupled vibration behavior in IMU under gyro dither excitation.…”

Section: Structure Components Of Laser Gyro Imumentioning

confidence: 99%

“…Therefore, frequency-domain-analysis based modelling and optimization methods [27] may become the new key techniques for the vibration decoupling and optimization of the laser gyro IMU. Frequency-domain analytical methods focus on the analysis and optimization of the modal and frequency response for the mechatronic systems, which have been widely used in multiple precision manufacturing fields, that is, the dynamic analysis and optimization of the high-performance machine tools [28], the design of the active vibration isolators for the precision instruments [29], and the NVH (noise, vibration, and harshness) analysis of the vehicle [30], among others.…”

Section: Introductionmentioning

confidence: 99%

Coupled Dynamic Analysis and Decoupling Optimization Method of the Laser Gyro Inertial Measurement Unit

Fang

Zeng

2019

Sensors

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The mechanical dithered ring laser gyro (RLG) effectively overcomes the lock-in effect and ensures the sensitive accuracy of the low angular rate for the gyro. However, in the inertial measurement unit (IMU) system, the dither excitation of three RLGs causes the coupled vibration of the IMU structure, which could seriously limit the measuring accuracy of RLGs. In this paper, the vibration frequency response characteristic of laser gyro IMU is taken as the focus point, and the method of multi-rigid body dynamics is used to establish the dynamic model of IMU suitable for vibration frequency response analysis. On the basis of the model, the multi-degree-of-freedom coupling vibration of IMU with the gyro dither excitation is clearly described. A new IMU dynamic decoupling optimization method is proposed to minimize the coupled vibration frequency response, and compared with the previous optimal design method. The prototype experimental test results show that the coupled vibration of IMU is restrained more effectively by the proposed new method than by the previous optimal design method. Finally, on the basis of this new method, the measuring accuracy of the RLGs in the IMU system is improved, which is quite useful for practical engineering application.

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Chatter avoidance in cutting highly flexible workpieces

Cited by 51 publications

References 18 publications

Self-oscillation suppression when turning non-rigid shafts using spring tools and the spring headstock center

Self-oscillation suppression when turning non-rigid shafts using spring tools and the spring headstock center

Comparison of different mathematical models for prediction of self-excited vibrations occurance in milling process

Coupled Dynamic Analysis and Decoupling Optimization Method of the Laser Gyro Inertial Measurement Unit

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